EP1131810B1 - Adressierverfahren und plasmaanzeige basierend auf separaten gerade und ungerade numerierten linienadressen - Google Patents

Adressierverfahren und plasmaanzeige basierend auf separaten gerade und ungerade numerierten linienadressen Download PDF

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EP1131810B1
EP1131810B1 EP99947562A EP99947562A EP1131810B1 EP 1131810 B1 EP1131810 B1 EP 1131810B1 EP 99947562 A EP99947562 A EP 99947562A EP 99947562 A EP99947562 A EP 99947562A EP 1131810 B1 EP1131810 B1 EP 1131810B1
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line
lines
sub
bits
column
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EP1131810A1 (de
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Didier Thomson Multimedia DOYEN
Jean-Claude Thomson Multimedia CHEVET
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Vantiva SA
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/2033—Display of intermediate tones by time modulation using two or more time intervals using sub-frames with splitting one or more sub-frames corresponding to the most significant bits into two or more sub-frames
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G09G3/2029—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having non-binary weights
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0216—Interleaved control phases for different scan lines in the same sub-field, e.g. initialization, addressing and sustaining in plasma displays that are not simultaneous for all scan lines
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0266—Reduction of sub-frame artefacts
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels

Definitions

  • the invention relates to an addressing method and device for plasma panel based on separate addressing of even lines and odd lines.
  • the gray level is not achieved in a classic way from an amplitude modulation of the signal but from a temporal modulation of this signal, by exciting the corresponding pixel, more or less long depending on the desired level. This is the phenomenon of integration of the eye which makes it possible to render this gray level. This integration takes place during the frame scanning time.
  • the plasma cell has a threshold of trigger which is not independent of the state of its immediate neighbors.
  • a cell will be all the more easily excitable when its neighbors are excited, we are actually talking about a priming phenomenon.
  • the barriers separating the different cells are not completely hermetic, a certain number of free electrons from excited neighboring cells come favor the excitation of the addressed cell.
  • This priming problem is in fact amplified by the non-uniformity of the sign. It is always possible, to promote the excitation of cells to do vary the control voltages, but this becomes impossible when the Glass tiles do not have the same spacing over the entire panel, for example. In this case, the compromise found at the level of the control voltages does not does not optimize the ignition of all cells.
  • the plasma panel unlike the cathode ray tube has a linear response, i.e. the level of luminance emitted is strictly proportional to the video level.
  • Current visualization systems are largely based on the use of cathode ray tubes. So he is performed at the shooting level, an a priori compensation operation of the cathode ray tube response. To be able to correctly view such a signal on a plasma panel, so correction is necessary inverse (gamma correction) to obtain real information in the end.
  • Figure 1 shows the shape of the compensation curve 1 of the response of a tube to the broadcast, the abscissa axis representing the video level input and the ordinate axis representing the output video level after correction.
  • Curve 2 corresponds to a linear response obtained after application of the correction as shown in 3.
  • the effect of this correction is to greatly limit the quantification of low levels insofar as at a signal level of output can correspond to several levels of the input signal. This is especially true for low levels, for example in the area materialized in 4 where the entry levels between 0 and 15 correspond to a single level output equal to zero.
  • the subject of the invention is a method of addressing cells arranged according to a matrix table, each cell being located at the intersection of a line and a column, the table having row entries and column entries for the display of grayscale defined by video words composing a signal digital video and defining an image, the column inputs receiving each a control word in this column corresponding to the video word relative, for this column, to an addressed line, this word being composed of n bits transmitted sequentially, each sequence corresponding to a sub-scan, each bit triggering or not, depending on its state, the ignition of the cell of the row addressed and of the column receiving the command word, for a time proportional to the weight of this bit in the word, characterized by what we do a different coding of the column control words according to that the word is relative to an even or odd line, this difference consisting of that at least m successive bits of determined ranks have different weights from one control word to another, the sum of the weights of these bits remaining identical
  • the writing is simultaneous on two lines successive for at least the first bit of the m successive bits of a word of command relating to one of the two lines.
  • At least two are simultaneously selected successive lines for at least one of the bits of the column control words whose weight is common from one command word to another.
  • At least one of the bits of identical weight of a command word to another is used to encode a partial value of luminance common to two successive lines and the writing is simultaneous on these lines for this bit of the control word relating to one of the two lines,
  • the method is implemented for a number limited lines of the matrix table, these lines corresponding to the areas of the image defined by the video signal having strong vertical transitions, the other zones exploiting sub-scans corresponding to a process address for which the column control words have all the weights identical from one line to another.
  • the method is implemented for images having strong vertical transitions, the other images exploiting a addressing method for which the column control words have all the identical weights from one line to another.
  • the switching of the first method with n sub-scans to a second addressing method with a higher number of sub-scans and for which the words of column command have a higher number of bits having identical weights from one line to another is performed by replacing the selection of a line I when writing a bit of different weight on line l, in the first method, by the selection of line I and the immediately preceding line or immediately following for a simultaneous writing on these two lines, in the second process.
  • the invention also relates to a device for implementing the previous method comprising a video processing circuit for processing received video data, a correspondence memory for the transcoding of this data, a video memory for storing transcoded data, the video memory being connected to circuits column supply to control the column addressing of the panel to plasma from column control words, a circuit for controlling line supply circuits connected to the video processing circuit to select the lines, characterized in that the video processing circuit and the transcoding do different coding of column command words depending on whether the word is relative to an even or odd line, this difference consisting in that at least m successive bits of ranks determined among the bits to be transmitted have different weights from one command word to another, the sum of the weights of these bits remaining identical from one control word to another, to get writing times that are significantly different from line to line next.
  • the device is characterized in that the line supply circuit control circuit selects simultaneously two consecutive lines during transmission by circuits column feed of the first bit of the successive bits of a word command relating to one of the two lines.
  • the device is characterized in that it also includes a selection circuit receiving the video data for select a coding of the column control words corresponding to a addressing according to n sub-scans or to an addressing corresponding to a higher number of subscans based on variations in luminance from one line to another of an image.
  • the addressing method according to the invention consists in separating addressing even lines of odd lines using coding different from the column command words.
  • the writing instants from line to line the other, for certain bits of the control words, are significantly different. The initiation of cell excitations is thus favored.
  • This process allows a partial and variable copying of the video information from one line to another. We can thus play on the compromise number of underscans / loss of vertical resolution. It is then possible, by depending on the content of the video, to modify, for each of the couples of lines, the number of underscans and therefore the difference maximum allowed between two luminance values allowing an error lower than LSB.
  • the contouring effects are eliminated or less strongly reduced, the quantification of low levels is improved.
  • a plasma panel consists of two separate glass slabs about a hundred microns. This space is filled with a gas mixture containing neon and xenon. When this gas is electrically excited, the electrons gravitating around the nuclei are extracted and become free. The "plasma" means this gas in the excited state.
  • On each of the two slabs of the panel are screen printed line electrodes for a slab and column for the other panel. The number of row and column electrodes corresponds to the panel definition.
  • a barrier system is implemented space to physically delimit the cells of the panel and limit the phenomena of diffusion from one color to another. Each crossing of a column electrode and a row electrode will correspond to a video cell containing a volume of gas.
  • a cell will be called red, green or blue depending on the phosphor deposit with which it will be covered.
  • a video pixel being composed of a triplet of cells (one red, one green and blue), so there are three times more column electrodes than pixels on a line.
  • the number of line electrodes is equal to the number of lines of the sign.
  • One line of the plasma panel is addressed as many times as there are defined of sub-scans in the gray level information to be transmitted to the pixel, as explained below.
  • the pixel selection is made by the transmission of a voltage called registration pulse, via a supply circuit, along the entire line corresponding to the selected pixel while the information corresponding to the gray level value of the pixel selected is transmitted in parallel on all the electrodes of the column on which the pixel is located. All columns are supplied simultaneously, each of them with a value corresponding to the pixel of this column.
  • Each bit of gray level information is associated with a time information which therefore corresponds to the ignition time of the bit or more overall at the time between two inscriptions: a bit of weight 4 with the value 1 will thus correspond to an ignition of the pixel for a duration 4 times higher an ignition corresponding to the weight bit 1.
  • This holding time is defined by the time separating the registration top from an erasure top and corresponds to a holding voltage which precisely allows the excitation of the cell after addressing.
  • the panel will be scanned n times to transcribe this level, each of these subscans having a duration proportional to the bit it represents.
  • the eye converts this "global" duration corresponding to the n bits in an ignition level value.
  • a sequential scan of each of the bits of the binary word is therefore carried out in applying a duration proportional to the weight.
  • the addressing time of a pixel, for a bit, is the same regardless of the weight of this bit, which changes is the ignition hold time for this bit.
  • a cell therefore has only two states: excited or not excited.
  • T This period frame is divided into as many sub-periods (sub-scans) as there are bits coding of the video (number of bits called n). From these n sub periods, we must be able to combine all the gray levels by combination between 0 and 255. The eye of the observer will integrate over a frame period these n sub-periods and thus recreate the desired gray level.
  • a panel is made up of NI lines and Nc columns supplied by NI line supply circuits and Nc column supply circuits.
  • the generation of the gray levels by time modulation requires addressing the panel n times for each pixel of each line.
  • the matrix aspect of the panel will allow us to simultaneously address all the pixels on the same line by sending an electrical pulse of Vccy level to the line supply circuit.
  • the signals transmitted on the columns are called column control words and relate to the video signal to be displayed, this relationship being for example a transcoding function of the number of bits used.
  • a sequencing algorithm makes it possible to address all the lines n times, respecting the respective weight of the underscan between each addressing made.
  • the abscissa axis represents time and is divided in frame periods of duration T. Each frame period is divided into sub periods of time whose duration is proportional to the weight of the different sub-scans allowing you to define a video level to be displayed on the screen plasma, (1, 2, 4, 8 ..., 128) for 8-bit quantized video and addressing with 8 sub-scans.
  • the ordinate axis represents the level 0 or 1 of the address bits during the corresponding frame periods, in other words the off state or on of a cell as a function of time, for a given level of coding.
  • Curve 5 corresponds to a coding of the value 128, curve 6 to a coding of the value 127 and curve 7 to a coding of the value 128 during the first frame and the value 127 during the second frame and vice versa for the next two frames.
  • the 8 sub-scans being distributed over the 20 ms of the frame, the eye by integrating asynchronously the video, shows black areas, part b of the curve 7 corresponding to a level 0 during the duration of two frames successive, and white areas, part a of curve 7 corresponding to a level 1 for the duration of two successive frames.
  • contouring phenomenon manifests itself particularly on moving areas where strong transitions exist (contours of objects) or more generally switching at the most significant level in coding of this video. In the case of a color screen, this takes the form of the appearance on the panel, at these contours, of "false colors" due to an incorrect interpretation of the triplet R G B. This phenomenon is therefore linked the video level timing system and the fact that the eye in his role as an integrator, incorrect contours appear.
  • One solution to this problem consists in coding the gray level to be transmitted on more bits than is theoretically necessary (8 for coding 256 levels) and thus defining more sub-scanning to better distribute the information in time.
  • the respective weights of the sub-scans are reduced, the problems during their switching are limited.
  • a grayscale transcoding will be for example: 1 2 4 8 16 32 32 32 64 64.
  • the heaviest weights can therefore be 64 instead of 128.
  • FIG. 3 A sequencing algorithm according to the prior art is shown in the FIG. 3 and is set out below in order to facilitate understanding of the invention, exposing the differences from this prior art.
  • This sequencing algorithm is known by the English name Simultaneous Addressing Scanning or SAS, i.e. addressing scanning simultaneous. It makes it possible to address all the lines n times (corresponding to the number n of bits) respecting the duration between each addressing corresponding to the weight of the bit relating to this addressing. Each of the lines is addressed for each of the subscans in an order defined as the shows figure 3 for a system with 4 sub-scans.
  • the horizontal axis represents time t and the vertical axis the number of line.
  • the display time in fact the holding time after registration, depends on the weight of the bits, of this word control.
  • These durations are represented, for each of the bits 0 to 3, by two oblique solid lines framing each of the mentions SB0 to SB3, for example the holding time referenced 8 for the SB3 underscan.
  • the shaded areas 9 and 11 correspond to the scanning of the previous frame and the next frame and the intermediate area 10 corresponds to the scanning of the current frame.
  • the intersections with the oblique lines successively represent the beginnings of registration relating to the sub-scans SB3, SB2, SB1 and SB0 of the same frame ( in this example) which reported on the ordinate axis correspond to line numbers l 3 , I 3 +1, l 3 +2, l 3 +3, for example 100 and the following lines 101, 102 and 103 for SB3 , I 2 , I 2 +1, I 2 +2, I 2 +3 for SB2, etc.
  • These addressing of the 4 times 4 lines takes place during a time interval dt.
  • the next moment will write lines 104, 105, 106, 107 for SB3 and so on.
  • Figure 4 shows how, in time, the 2 algorithms are nested. Everything happens as if we had in this case 8 sub-scans, each applying to a line parity only (even or odd).
  • the solid oblique lines correspond to the sub-scans SB0 to SB3 and the oblique dotted lines in the subscreens SB'0 to SB'3.
  • the line addressed for the subscanning SB3 is an even line l 3 (in fact the group of four successive even lines I 3 , I 3 +2, l 3 +4, I 3 +6)
  • the line addressed for the sub-scan SB'2 is an odd line l ' 2 (in fact the group of four odd lines I' 2 , 1 ' 2 +2, 1' 2 +4, I ' 2 , + 6 ) and so on for the other subscans at this time t.
  • the nesting of the subscans SB 'in the subscans SB can be completely arbitrary and it is not necessary that any correlation exists between the instants of underscan of these two types (underscan type SB for even lines and sub-scan type SB 'for lines odd).
  • maintenance times can be completely decorated and only depend on the bit weights of the words of column command which will be assigned to each type of underscan.
  • the weight of the column command words can be chosen different for the SB subscanning and for SB 'subscanning.
  • FIGS. 5 and 6 represent timing diagrams of two successive lines I and I + 1 and the writing instants W for these lines.
  • Line l + 1 is controlled by a nested subscanning SB ' as previously stated.
  • the entry orders are specific to a single line, the durations sub-scans are independent from one line to another.
  • Figure 6 no longer refers to Figure 4 and gives, in a way general, the principle of the invention using a nested scan.
  • the first timing diagram corresponds to line I and represents 4 sub-scans successive Sb1 to Sb4 of holding time t1 to t4.
  • the second timing diagram corresponds to line l + 1 and represents 4 successive subscans Sb'1 to Sb'4 of holding time t'1 to t'4.
  • the holding time T2 is divided into two periods t1 and t2 and the holding time T3 in two periods t3 and t4.
  • the addition of the write signal makes it possible to split the holding time T'2 into two periods t'2 and t'3.
  • the big advantage of this method is that you can easily switch from a 16 sub-scan mode to a 13 sub-scan mode (see example given below) from one frame to another and without a transition cycle.
  • the adaptation can therefore be made according to the content of the sequence and even depending on the content of the image.
  • a system for measuring the vertical resolution can be used to make a decision on the number of sub-scans to use.
  • the method even allows for a couple of lines to another, from a mode 13 to 16 sub-scans. Decision information can be calculated for each couple of lines.
  • the coding of a gray level according to this principle is carried out taking into account not only the luminance value of the selected pixel but also the value of luminance of the pixel on the adjacent row for the same column.
  • the column control word for a given pixel, is separated into two parts, a first command word corresponding to a value common to the two pixels and a second and third word of command corresponding to the specific pixel values.
  • n1, n2, n3 are not fixed. It is possible to modulate the relationship between the definition of specific values and that of common value. Loss of resolution due to coding will be the lower the specific values will be the better defined. Through however, the total number of underscans will be higher as the specific values will be the least well defined. So there is a compromise to find between loss of resolution on the one hand and minimization of defects of viewing each other.
  • VS1 - VS2 must be equal to NG1 - NG2 (always to have a zero coding error):
  • D this difference between NG1 and NG2
  • VS1 and VS2 by addition of the term D and of a portion a of the lowest gray level.
  • ⁇ is a parameter to be defined in the same way as n1, n2, n3.
  • This value ⁇ is the result of algorithmic tests and is therefore partially determined empirically.
  • the value is chosen in function of induced calculations, for example the value 3/16 facilitating calculations by the digital signal processor DSP (Digital Signal Processing in English).
  • the difference D between the gray values is coded from the most near multiple of 5 of this value D.
  • Specific values VS1 and VS2 are multiples of 5 and the proportion of the specific value to the global value (the parameter ⁇ ) is chosen equal to 3/16.
  • the value of VS1 is thus the modulo 5 value closest to 60 x 3/16.
  • the specific value which contains the difference information between the two coded pixels, is defined only on a restricted number of bits.
  • the maximum difference that can be coded will therefore be limited in fact to the value maximum that can be coded as a specific value. So this is going to prohibit coding large differences.
  • the difference that can be coded being limited, one of the specific values will be equal to the maximum value and the other will be equal to 0.
  • the common value will be determined so that minimize the error on the final value. In this case, the final error may be greater than 1.
  • the following table gives an example of a coding between 2 pixels whose difference is greater than the maximum definition of the specific value.
  • the maximum value chosen for the specific value is taken equal to 70: NG1 NG2 D D by 5 limited VS1 VS2 VC VF1 VF2 E1 E2 10 100 90 70 0 70 20 20 90 10 -10
  • the gain will be 6 sub-scans with an error of recoding less than or equal to 1 (for a difference between lines less than or equal to 70).
  • FIG. 7 shows such addressing with 16 sub-scans.
  • On line I and the line l + 1 follow each other as a function of time the sub-scans corresponding to the bits of weight 10, 9, 15, 12, 20.
  • the writings referenced 14 are common to lines I and I + 1, for the values 9, 15, 12.
  • the entries referenced 15 are specific to lines I and l + 1 and relate to the values 10, 20.
  • the 16-bit code above corresponds to the weight of the bits of the column control words calculated from the video information: 1 2 4 5 6 9 10 12 15 19 20 23 27 31 35 36
  • each video information is separated into information specific to current line I and common information to the 2 adjacent lines I and I + 1.
  • the specific information is coded on 4 bits whose respective weights are multiples of 5 (5,10,20,35).
  • information common is coded on 12 bits.
  • This order defines the rank of the bits of the transmitted control words, represented by their weight.
  • the first 4 sub-scans (1, 2, 4, 6) are always common to the 2 adjacent lines.
  • FIG. 8 shows such addressing with 13 sub-scans.
  • On the line I succeeds the sub-scans corresponding to bits of weight 10, 24, 12, 20.
  • On line l + 1 follow each other the sub-scans corresponding to bits of weight 10, 9, 27, 20.
  • the writings referenced 16 are common on lines I and l + 1, for the values 9 and 24.
  • the entries referenced 17 are specific to lines I and I + 1 and relate to the values 10, 20, 12 and 27. In done, it is the inscription relative to the sub-scan 9 which is common but we do not does not erase line l at the end of the maintenance cycle. If there is not erasure, the information entered remains present, which implies that the video information which for weight 9 on line l + 1 has a different weight (24) on line l.
  • the line l + 1 is deleted at the end of the weight cycle 9.
  • video information which corresponds to 15 in 16 sub-sweep mode
  • a sub-scan of duration 24 (9 + 15) whose video content is the same as the duration 9 sub-scan of line I + 1.
  • the sub-scan 15 of the line l + 1 actually lasts 27 (15 + 12).
  • An erasure signal common to lines I and I + 1 is then made before entering the video information corresponding to the specific values of weight 20.
  • subscans 19, 23, 27, 31, 36 of a addressing 16 sub-scans can be transformed into 3 sub-scans 42, 58, 36 for line I and 19, 50, 67 for line I + 1. Only constraint, the video information of sub-scan 42 of line I is the same as that of underscan 19 of line I + 1.
  • the column command words were coded on 16 bits and, depending on the weight of the bits, the lines were addressed separately or 2 by 2.
  • the scanning times for writing the 2 bits, for which lines were addressed 2 by 2, were therefore divided by 2, reducing the sweep time to that of a control word column of 10 bits (4 + 12/2).
  • the words of column command are coded on 13 bits, bits being common to two successive lines.
  • the weights of bits of rank 7 and 8 have the same sum 36.
  • the weights of bits of rank 10, 11, 12 have the same sum 136.
  • the lines are addressed 2 by 2, in the example, for the weights: 1, 2, 4, 6, 9 or 24, 19 or 42 (depending on the column command word considered).
  • the big advantage of this technique is to be able to perform the switching between 16 sub-scan addressing and 13 addressing sub-scans on demand and for a given couple of lines. It is possible for example to detect upstream areas of the image with strong vertical transitions. All the lines in this zone will then be passed in addressing to 13 sub-scans, the others being able to remain addressed to 16 subfields.
  • This switching which corresponds to the passage of a addressing according to figure 8 to addressing according to figure 7 is done in a simple way, by replacing the selection of a line I (or a line I + 1) when writing a bit of different weight on line I (or I + 1) by the selection of line I and the immediately next (or previous) line for simultaneous writing on these two lines.
  • This number of subscans is related to the number of bits having different weights of a column command word corresponding to a row at command word column corresponding to the following line and this number, therefore the column control words used for coding the image, may be chosen according to the images to be processed, this choice can also be performed frame by frame.
  • the weight of the bits concerned can be chosen in depending on image resolution.
  • FIG. 9 An exemplary embodiment of the device implementing the method of scanning is described below.
  • the simplified diagram of the control circuits a plasma panel 18 is shown in FIG. 9.
  • Digital video information arrives at input E of the device which is also the input of a video processing circuit based on microprocessor 19 and the input of a selection circuit 20.
  • the video processing is connected to a correspondence memory 21, to the selection 20, at the input of a video memory 22 and at a scanning generator or control circuit for power supply circuits on line 24.
  • Video memory transmits the stored information to the input of a circuit 23 grouping the column supply circuits.
  • the scan generator 24 transmits information from synchronization to video memory 22 and controls a circuit 25 grouping the line supply circuits.
  • the video information coded on 8 bits and received on input E is thus transmitted to the selection circuit 20 which stores the video data on a full picture.
  • This circuit analyzes the content of the video and calculates the number of times there is a difference in luminance in the image between the line I and line l + 1 greater than a preset threshold.
  • scanning is carried out by exploiting the principle of nesting of the sub-scans, that is to say from an address with 13 sub-scans. Otherwise, 16 sub-scans are performed.
  • the type of scan information is transmitted to the processing circuit 19 which carries out the coding of the information video accordingly.
  • the processing circuit transmits this information to scanning circuit 24 so that it scans the screen as a function of this coding.
  • the processing circuit 19 exchanges the video data with the memory or correspondence table 21 which, depending on the values of the video words sent as addresses, will supply as data corresponding words to 13 or 16 bit codes whose weights will have been defined beforehand.
  • This transcoding from the correspondence table 21 is defined as a function of the addressing mode used.
  • the scanning generator 24 performs, for the duration of a frame and via line supply circuits 25, the line sweep of the screen.
  • This circuit 25 supplies the addressing voltage and also the voltage of hold for the duration corresponding to the sub-sweep relative to the weight of the bit sent on the columns for this addressing.
  • the scan generator 24 performs the sub-scans as a function commands received from the processing circuit.
  • the selection circuit 20 can very well be placed in upstream of the device and in particular of the processing circuit in order to avoid any delay in coding video words.
  • the invention is not limited by the number of bits quantifying the digital video signal to view, nor the number of sub-scans.
  • the cells of this device or matrix table with row and column entries can be plasma panel cells but also micromirrors of circuits to micromirrors. Instead of emitting light directly, these micromirrors reflect, from time to time (a cell corresponding to a micromirror), received light, when selected. Their addressing for the selection is then identical to the addressing of the cells of the panels to plasma as described in the present application.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)

Claims (13)

  1. Verfahren zur Adressierung von entsprechend einer Matrixtafel angeordneten Zellen, wobei jede Zelle bei dem Schnittpunkt einer Zeile und einer Spalte liegt, die Tafel Zeileneingänge und Spalteneingänge zur Wiedergabe von Grauwerten aufweist, die durch Videowörter definiert sind, die ein digitales Videosignal bilden und ein Bild definieren, jeder der Spalteneingänge ein Steuerwort für diese Spalte empfängt, das dem Videowort entspricht, das für diese Spalte einer adressierten Zeile gehört, wobei dieses Wort aus n sequentiell übertragenen Bit besteht, jede Folge einer Unterabtastung entspricht, jedes Bit entsprechend seinem Zustand die Aufhellung der Zelle der adressierten Zeile und der das Steuerwort empfangenen Spalte für eine Zeit auslöst oder nicht auslöst, die proportional zu dem Gewicht dieses Bit in dem Wort ist,
    dadurch gekennzeichnet, daß
    eine unterschiedliche Kodierung der Spaltensteuerwörter erfolgt, abhängig davon, ob das Wort einer geradzahligen oder einer ungeradzahligen Zeile entspricht, daß diese Differenz darin besteht, daß wenigstens m aufeinanderfolgende Bit von vorbestimmten Rängen, wobei m zwischen 2 und n liegt, unterschiedliche Gewichte von einem Steuerwort zu dem anderen aufweisen, daß die Summe der Gewichte dieser Bit von einem Steuerwort zu dem anderen identisch bleibt, um Schreibzeitpunkte zu erhalten, die von einer Zeile zu der folgenden nennenswert unterschiedlich sind.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Schreiben auf zwei aufeinanderfolgenden Zeilen für wenigstens das erste Bit der m aufeinanderfolgenden Bit eines Steuerworts für eine der beiden Zeilen gleichzeitig ist.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß wenigstens zwei aufeinanderfolgende Zeilen gleichzeitig für wenigstens eines der Bit eines vorbestimmten Rangs ausgewählt werden, der für ein Steuerwort zu dem anderen ein identisches Gewicht aufweist.
  4. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß wenigstens eines der Bit eines bestimmten Rangs, der ein identisches Gewicht von einem Steuerwort zu dem anderen hat, dafür benutzt wird, einen Teilwert der Luminanz zu kodieren, der für zwei aufeinanderfolgende Zeilen gemeinsam ist, und daß das Schreiben gleichzeitig auf diesen Zeilen für dieses Bit des Steuerworts für eine der beiden Zeilen erfolgt.
  5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß es für eine begrenzte Anzahl von Zeilen der Matrixtafel durchgeführt wird, daß diese Zeilen den Bildbereichen entsprechen, die in Abhängigkeit von Änderungen der Luminanz von einer Zeile zu der anderen definiert sind, daß die anderen Bereiche die Unterabtastungen auswerten, die einem Adressierverfahren entsprechen, für das die Spaltensteuerwörter alle von einer Zeile zu der anderen identische Gewichte aufweisen.
  6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß es für eine Anzahl von Bildern durchgeführt wird, die in Abhängigkeit von den Änderungen der Luminanz von einer Zeile zu der anderen definiert sind, und die anderen Bilder einen Adressiervorgang anwenden, für den die Spaltensteuerwörter alle identische Gewichte von einer Zeile zu der anderen aufweisen.
  7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Umschaltung des ersten Adressierverfahrens mit n Unterabtastungen auf ein zweites Adressierverfahren mit einer größeren Zahl von Unterabtastungen, für die die Spaltensteuerwörter eine größere Zahl von Bit aufweisen, die identische Gewichte von einer Zeile zu der anderen aufweisen, dadurch erfolgt, indem die Auswahl einer Zeile I bei dem ersten Verfahren durch die Auswahl der Zeile I und die unmittelbar vorangehende oder unmittelbar folgende Zeile für ein gleichzeitiges Schreiben auf diesen beiden Zeilen in dem zweiten Verfahren ersetzt wird.
  8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Wert von m oder der der Gewichte, die diesen m Bit entsprechen, abhängig ist von der Vertikalauflösung des Bildes.
  9. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Zellen Zellen eines Plasmaschirms sind und daß die Auswahl die Aufhellung der Zelle bewirkt.
  10. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Zellen Mikrospiegel einer Mikrospiegel-Schaltung sind.
  11. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 mit einer Video-Verarbeitungsschaltung (19) zur Verarbeitung der empfangenen Videodaten, einem Korrespondenzspeicher (21) für die Transkodierung dieser Daten, einen Videospeicher (22) für die Speicherung der transkodierten Daten, wobei der Videospeicher mit den Spalten-Speiseschaltungen (23) verbunden ist, um die Spaltenadressierung des Plasmaschirms durch die Spaltensteuerwörter zu steuern, einer Steuerschaltung (24) für die Zeilenspeiseschaltungen (25), die mit der Video-Verarbeitungsschaltung verbunden sind, um die Zeilen auszuwählen, dadurch gekennzeichnet, daß die Schaltung zur Videoverarbeitung und zur Transkodierung eine unterschiedliche Kodierung der Spaltensteuerwörter bewirken, abhängig davon, ob das Wort zu einer geradzahligen oder einer ungeradzahligen Zeile gehört, wobei dieser Unterschied darin besteht, daß wenigstens m aufeinanderfolgende Bit der bestimmten Ränge unter den zu übertragenden Bit, wobei m zwischen 2 und n liegt, unterschiedliche Gewichte von einem Steuerwort zu dem anderen aufweisen, daß die Summe der Gewichte dieser Bit von einem Steuerwort zu dem anderen identisch bleibt, um so Schreibzeitpunkte zu bilden, die von einer Zeile zu der nächsten nennenswert unterschiedlich sind.
  12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß die Schaltung zur Steuerung der Zeilenspeiseschaltungen gleichzeitig zwei aufeinanderfolgende Zeilen während der Übertragung durch die Spaltenspeiseschaltungen des ersten Bit der aufeinanderfolgenden Bit eines Steuerworts für eine der beiden Zeilen wählt.
  13. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß sie außerdem eine Auswahlschaltung (20) enthält, die die Videodaten empfängt, um eine Kodierung der Spaltensteuerwörter entsprechend einer Adressierung gemäß n Unterabtastungen oder einer Adressierung entsprechend einer größeren Anzahl von Unterabtastungen in Abhängigkeit von den Änderungen in der Luminanz von einer Zeile zu der anderen in einem Bild oder einem Bildteil auszuwählen.
EP99947562A 1998-10-23 1999-10-13 Adressierverfahren und plasmaanzeige basierend auf separaten gerade und ungerade numerierten linienadressen Expired - Lifetime EP1131810B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9813314 1998-10-23
FR9813314A FR2785076B1 (fr) 1998-10-23 1998-10-23 Procede d'adressage pour ecran a plasma base sur un adressage separe des lignes paires et impaires
PCT/FR1999/002474 WO2000025291A1 (fr) 1998-10-23 1999-10-13 Procede d'adressage pour ecran a plasma base sur un adressage separe des lignes paires et impaires

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EP1131810B1 true EP1131810B1 (de) 2002-07-31

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DE (1) DE69902402T2 (de)
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FR2802010B1 (fr) * 1999-12-06 2002-02-15 Thomson Multimedia Sa Procede d'adressage de panneau d'affichage au plasma
FR2826767B1 (fr) * 2001-06-28 2003-12-12 Thomson Licensing Sa Procede d'affichage d'une image video sur un dispositif d'affichage numerique
EP1376521A1 (de) * 2002-06-28 2004-01-02 Deutsche Thomson Brandt Videobildbearbeitung zur verbesserten Kompensation des dynamischen Falschkontureffekts
JP5220268B2 (ja) 2005-05-11 2013-06-26 株式会社ジャパンディスプレイイースト 表示装置
JP4768344B2 (ja) * 2005-05-11 2011-09-07 株式会社 日立ディスプレイズ 表示装置

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DE69524502T2 (de) * 1994-07-25 2002-06-06 Texas Instruments Inc Verfahren zum Reduzieren zeitlicher Artefakte in digitalen Videosystemen
JPH08248916A (ja) * 1995-03-07 1996-09-27 Oki Electric Ind Co Ltd 直流型プラズマディスプレイの駆動方法
US6373452B1 (en) * 1995-08-03 2002-04-16 Fujiitsu Limited Plasma display panel, method of driving same and plasma display apparatus

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CN1157704C (zh) 2004-07-14
EP1131810A1 (de) 2001-09-12
CN1324477A (zh) 2001-11-28
WO2000025291A1 (fr) 2000-05-04
AU6096399A (en) 2000-05-15
FR2785076A1 (fr) 2000-04-28
JP2002528772A (ja) 2002-09-03
DE69902402T2 (de) 2003-01-09
FR2785076B1 (fr) 2002-11-15
KR20010080280A (ko) 2001-08-22

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