EP1964093B1 - Antriebsverfahren für eine plasmaanzeigetafel mit depolarisierung - Google Patents

Antriebsverfahren für eine plasmaanzeigetafel mit depolarisierung Download PDF

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Publication number
EP1964093B1
EP1964093B1 EP06841465.5A EP06841465A EP1964093B1 EP 1964093 B1 EP1964093 B1 EP 1964093B1 EP 06841465 A EP06841465 A EP 06841465A EP 1964093 B1 EP1964093 B1 EP 1964093B1
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Prior art keywords
voltage
depolarization
ref
control
circuit
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English (en)
French (fr)
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EP1964093A1 (de
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Sylvain Thiebaud
Jean-Paul Dagois
Philippe Le Roy
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Thomson Licensing SAS
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Thomson Licensing SAS
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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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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
    • G09G3/30—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 electroluminescent panels
    • G09G3/32—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—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 electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation 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
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0254—Control of polarity reversal in general, other than for liquid crystal displays
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3614—Control of polarity reversal in general

Definitions

  • the invention relates to active matrix panels for displaying images using light emitter networks, for example light-emitting diodes, or optical valve arrays, for example liquid crystal valves. These emitters or valves are generally divided into rows and columns.
  • active matrix designates a substrate which integrates networks of electrodes and circuits able to control and feed emitters or optical valves supported by this substrate.
  • These electrode arrays generally comprise at least one addressing electrode array, a selection electrode array, at least one reference electrode for addressing and at least one base electrode for feeding these emitters. . Sometimes the reference electrode for addressing and the base electrode for power are merged.
  • the panel further comprises at least one upper feed electrode, generally common to all valves or emitters, but which is not integrated with the active matrix.
  • Each valve or emitter is generally interposed between a base supply terminal connected to a base electrode for the supply and the upper supply electrode which generally covers the entire panel.
  • Each control circuit comprises a control terminal connected to or coupled to an addressing electrode via a selection switch, a selection terminal which corresponds to the control of this switch and which is connected to a selection electrode, and a terminal of reference connected to or coupled to a reference electrode.
  • Each control circuit therefore comprises a selection switch adapted to transmit to this circuit the addressing signals from an addressing electrode. Closing the selection switch of a circuit corresponds to the selection of this circuit.
  • each addressing electrode is connected to or coupled to the control terminals of the control circuits of all the emitters or valves of the same column; each selection electrode is connected to the selection terminals of the control circuits of all the transmitters or all the valves of the same line.
  • the active matrix may also include other row or column electrodes.
  • the addressing electrodes are used to address to the control circuits control signals, analog voltage or current, or digital; during the transmission periods, each control signal intended for the control circuit of a valve or transmitter is representative of an image datum of a pixel or sub-pixel associated with this valve or transmitter .
  • each control and power supply circuit comprises a memory element, generally a capacitor able to maintain the control voltage of this valve during the duration of an image frame; this capacitor is connected in parallel directly to this valve; this capacitor can be formed by the valve itself.
  • the control voltage of a valve is the potential difference across this valve.
  • control terminal of the circuit is connected to or coupled to one of the terminals of the valve.
  • each control and supply circuit generally comprises a current modulator, generally a TFT transistor, provided with two terminals. current flow, a source terminal and a drain terminal, and a gate terminal for voltage control; this modulator is then connected in series with the transmitter to be controlled, this series being itself connected between an electrode (upper) supply and a base electrode for the power supply; generally, it is the drain terminal which is common to the modulator and the emitter, and the source terminal, connected to the base electrode for the supply, is thus at a constant potential; the modulator control voltage is the potential difference between the gate and the source of the modulator; each control circuit comprises means for generating a control voltage of the modulator as a function of the signal addressed to the control terminal of this circuit; each control circuit also comprises, as previously, a holding capacitor adapted to maintain the control voltage of the modulator during the duration of each image or image frame.
  • a current modulator generally a TFT transistor, provided with two terminals. current flow, a source terminal and a drain terminal, and a gate terminal for voltage control;
  • control There are typically two types of control: voltage control or current control.
  • the addressing signals are voltage steps; in the case of current control, the addressing signals are current steps.
  • each control circuit is adapted in a manner known per se to "program”, from a current signal, a control voltage of the modulator of this circuit. circuit, which is therefore applied to the gate terminal;
  • Classical control circuits with "current mirror” are thus conventionally found.
  • the addressing electrodes and the selection electrodes are themselves controlled by means of control ("drivers" in English) arranged at the ends of these electrodes, at the edge of the panel; these means generally comprise controllable switches.
  • An object of the invention is to avoid this disadvantage.
  • the addressing signals are generally transmitted to the control circuits by direct conduction between the addressing electrodes and the control terminals of the circuits, via the selection switch: in the case of analog voltage control of emitter panels, where the control terminal of the circuit corresponds to the gate terminal of the modulator, this gate voltage of the modulator is then equal to the voltage of the addressing electrode which controls this circuit, at least while this circuit is selected.
  • connection by capacitive coupling, and not by conduction, between the addressing electrodes and the control terminals of the circuits makes it possible to compensate for the differences in tripping thresholds of the modulators of these circuits, so as to obtain a better uniformity of luminance. screen and better picture display.
  • the other documents US6777888 , US6618030 , US6885029 describe a capacitive coupling between the addressing electrodes and the control of the current modulators of the emitters.
  • An essential aspect of the invention consists in using a capacitive coupling in order to invert the voltages at the terminals of valves or at the terminals of emitters, and / or the control voltages of the modulators of the control circuits of these emitters, without having to invert the addressing signals, which avoids resorting to expensive means for controlling the addressing electrodes.
  • the voltage signal which is transmitted by capacitive coupling is in particular a jump of the reference voltage for the addressing of the control circuits, in particular of the same line.
  • a suitable reference change it is possible, as described below, to send addressing signals of the same polarity in the transmission periods and in the periods of depolarization of control circuits of a transmitter or of a valve, in particular of the same line.
  • the capacitive coupling makes it possible to modify the voltage of a terminal by a voltage jump.
  • any algebraic offset ⁇ V of the reference voltage applied to this terminal is then transmitted by this capacitive coupling to the terminal. circuit control, regardless of the initial voltage or signal previously addressed to this control terminal.
  • control of each control circuit of a transmitter comprises, during the display of each image or image frame, two periods, a transmission period of this transmitter and a depolarization period of the modulator of the control circuit of this transmitter in which this emitter does not emit light.
  • the panel comprises a reference electrode specific to each line of emitters or valves; instead, as in the document US2003 / 052614 already mentioned, to add at the head of each addressing electrode of a column, a toggle switch between a column addressing terminal, able to transmit display control signals to the circuits of this column, and a column depolarization terminal brought to a depolarization potential, is added at the head of each reference electrode of a line, a toggle switch between a first line reference terminal for transmission, at the potential V ref-E and a second line reference terminal for the depolarization, raised to the potential V ref-P .
  • the holding capacitor is connected in a conventional manner between the control of the modulator and the reference terminal of the circuit.
  • the reference terminal of the circuit is maintained at the same potential V ref-P , and the potential of the control terminal is maintained at the value V prog-pol by the holding capacitor.
  • the value of V ref-P is thus adapted so that, whatever the address signal for the depolarization V pol addressed to the terminal circuit control to obtain, after shifting the reference, to the same terminal which corresponds in particular to the control of a current modulator, a potential V prog-pol able to depolarize this modulator, this addressing signal for depolarization of the same sign as the addressing signals for the transmission addressed to this circuit during the transmission periods.
  • This avoids advantageously to use expensive means for controlling the addressing electrodes.
  • the addressing signals are generally transmitted by conduction between the addressing electrodes and the control terminals of the circuits, although a capacitive transmission mode is also possible as described in the prior art already cited.
  • An advantage of the invention is to be applicable to these very simple control circuits, especially those which have only two transistors.
  • Another advantage of the invention is that it makes it possible to address to each circuit a specific depolarization signal V pol , and to adapt the depolarization operation to the polarization level of the modulator of each circuit, which level depends in particular on the transmission signal sent during the preceding transmission period.
  • the emitters or valves are capable of being fed between at least two feed electrodes, namely a base electrode for the supply which is generally part of the active matrix, and a so-called “upper” supply electrode, which covers generally all the emitters or valves.
  • the holding capacitor is adapted to maintain an approximately constant voltage on said control terminal during the duration of an image when said selection switch is open.
  • a predetermined transmission or depolarization voltage is generally applied and maintained at the control terminal of each of said control circuits of said panel.
  • the coupling between the control terminal of this circuit and an addressing electrode is preferably carried out by conduction; alternatively, this coupling is performed capacitively.
  • Control of the panel is generally intended for displaying a succession (or sequence) of images; each emitter or valve of the panel, then corresponds to a pixel or sub-pixel of the images to be displayed; during each transmission period, each emitter or valve of the panel is associated with a predetermined transmission voltage for controlling this emitter or valve, this voltage being adapted to obtain the display of said pixel or sub-pixel by this emitter or valve; during each depolarization period, each emitter or valve of the panel, is associated with a predetermined depolarization voltage able to depolarize this emitter, this valve, and / or its control circuit.
  • each period comprises, for obtaining said predetermined voltage V prog-data , V prog-pol at the control terminal of a circuit, a step of addressing in which a selection signal is applied to the control of the selection switch which couples said control terminal to an addressing electrode, and an addressing signal V data , V, is applied to this addressing electrode pol which is adapted to obtain said predetermined voltage V prog-data , V prog-pol to said control terminal, and, at the end of the selection signal, a holding step in which said predetermined voltage V prog-data , V prog-pol is held at the control terminal by said holding capacitor.
  • each depolarization period during which an address signal V pol is sent to an addressing electrode coupled to the control terminal of a circuit further comprises a reference de-keying step, interposed between the addressing step and the step of maintaining this period, during which the voltage applied to the reference terminal of this circuit goes from the transmission reference voltage V ref-E to the depolarization reference voltage V ref-P , and a reference re-calibration step, after said sustaining step, during which the voltage applied to the reference terminal of this circuit goes from the depolarization reference voltage V ref-P to the transmission reference voltage V ref-E .
  • the reference registration step preferably takes place before the addressing step of the transmission period following this depolarization period; alternatively, this resetting step is instead inserted between the addressing step and the step of maintaining this transmission period.
  • said emission reference voltage V ref-E and said depolarization reference voltage V ref-P are chosen so that said address signal V data , V pol has the same polarity whatever the period, be it emission or depolarization.
  • the voltage of the addressing electrode never changes sign, always has the same polarity, and it is advantageous to use conventional and economical means for controlling the addressing electrodes.
  • the polarity of the signals is evaluated with respect to a reference electrode for the control voltage of the circuits; it may be in particular a base electrode for the supply of emitters or valves.
  • V ref-P V ref-P
  • said reference electrodes are grouped into g groups, and all the reference electrodes of each group are connected to the same common reference terminal. If the transmitters or valves panel are distributed in m rows and n columns, such a variant then advantageously allows the simultaneous depolarization of all the circuits whose reference terminal is connected to the reference electrodes of the same group, while the other circuits remain available to order the show.
  • the panel is for example divided into g groups of q lines, where gxq is equal to the total number m of lines; interconnecting all the reference electrodes of the same group; the number of reference line latch switches is then limited to g; such a variant is advantageous especially when the time required to obtain effective depolarization of a modulator is much lower than the transmission time during which this modulator is polarized; in fact, the modulators of the control circuits of the lines of a single group are depolarized while the transmitters of the (g-1) other groups are in the transmission period; this optimizes the time available for transmission, which improves the luminance of the panel.
  • the control method according to the invention is then advantageously intended for the display of interlaced images, each distributed between an odd field of image data relative to the pixels or sub-pixels of the odd lines of this image.
  • each emitter or valve of the panel is associated with a pixel or sub-pixel of the images to be displayed; each transmission period of an image is subdivided between an odd field transmission period where the reference electrodes corresponding to the odd lines are brought to said transmission reference voltage V ref-E and a transmission period of an even frame where the reference electrodes corresponding to the even lines are brought to said transmission reference voltage V ref-E ; each depolarization period is also subdivided between an odd field depolarization period where the reference electrodes corresponding to the odd lines are brought to said depolarization reference voltage V ref-P and an even frame depolarization period where the reference electrodes corresponding to the even lines are brought to said depolarization reference voltage V ref-P ; and each odd field emission period coincides with an even field depolarization period, and each even frame transmission period coincides with an odd field depolarization period.
  • said panel comprises an array of light emitters able to be powered between at least one feed base electrode P B and at least one feed electrode P A
  • each of said control circuits of a transmitter comprises a current modulator comprising a voltage control electrode forming the control electrode of said circuit and two current-pass electrodes, which are connected between one of said supply electrodes and a supply electrode of said emitter.
  • such a modulator is a TFT transistor; the current delivered by the modulator is then a function of the potential difference between the gate terminal and the source terminal of this transistor; this potential difference is generally a function, if not equal to, the potential difference between the control terminal and a reference electrode for the control voltage of the circuit; the reference electrode for the control voltage of the circuit is then formed by the supply base electrode.
  • said current modulator is a transistor comprising an amorphous silicon semiconductor layer.
  • said emitters are electroluminescent diodes, preferably organic.
  • the embodiments presented below relate to image display panels where the emitters are organic electroluminescent diodes deposited on an active matrix incorporating control circuits and power supply of these diodes. These emitters are arranged in line and in column.
  • the panel here comprises a single selection electrode array Y S ; it comprises a reference electrode per line; we therefore have a reference electrode array Y R ; each reference electrode Y R serves all the control circuits of the same line; the panel also comprises means for controlling the reference electrodes, which are able to switch the potential of these electrodes between a reference potential for the emission V ref-E and a reference potential for the depolarization V ref-P .
  • V ref-P ⁇ V ref-E ; these means generally comprise toggle switches (not shown).
  • the control terminal C of the circuit is connected to an addressing electrode X D , via a selection switch T1, which corresponds to a "conductive" coupling between this terminal and this electrode; in this embodiment, there is no capacitive coupling to the addressing. It will be seen later that the capacitive coupling occurs here between the reference terminal R 'of the circuit and the control terminal C of the circuit.
  • the selection switch T1 is controlled by a selection electrode Y S.
  • the reference terminal R ' is connected to the reference electrode Y R of the line.
  • the current modulator T2 is connected in series with the diode 2: the drain terminal D is thus connected to the cathode of the diode 2.
  • This series is connected between two feed electrodes: the source terminal S is connected to the supply base electrode P B and the anode of the diode 2 is connected to the upper supply electrode P A.
  • Each circuit 1 "" thus comprises only two TFT transistors.
  • Vdd and Vss are respectively applied to the supply electrodes P A and P B.
  • the difference Vdd - Vss is adapted to obtain the emission of the diode when the control of the modulator is greater than its trigger threshold voltage.
  • each image or image frame is broken down into a transmission period of this diode for display and a depolarization period. for compensation of the drift of the modulator threshold of this circuit.
  • each control circuit 1 "" of a diode 2 For the control of each control circuit 1 "" of a diode 2, the control of this circuit during each image frame is then decomposed in six steps.
  • Step 1 addressing for the show :
  • the potential of the reference electrode Y R to which the reference terminal R 'of the circuit 1 "" is connected is previously brought to the value V ref-E , the selection switch T1 is closed by applying to the electrode selecting Y S a suitable logic signal; the closing of T1 has the effect of selecting the circuit by connecting the control terminal C to the addressing electrode X D ; during this step, the potential of the address electrode is raised to the value V data-1 so that the potential of the control terminal C takes the value v prog-data-1 , here equal to V data -1 since the coupling is "conductive" between this terminal and this electrode.
  • the duration of this step is sufficiently high to charge the holding capacitor C S ; the diode 2 begins to emit a luminance proportional to the image data of the pixel or subpixel associated with it during this image frame.
  • Step 2 of maintaining the circuit during the emission period :
  • the selection switch T1 remains open; the control circuit 1 "" is no longer selected.
  • the capacitor C S maintains a constant value the voltage of the control terminal C, and the diode 2 continues to emit a luminance proportional to the image data of the pixel or subpixel associated with it .
  • control circuits of the other diode lines are selected by addressing to the control terminals of these circuits the addressing signals able to display the entire image.
  • the potential of the reference electrode Y R at which the reference terminal R 'of the circuit 1 "" is connected is always at the value V ref-E , the selection switch T1 is closed by applying to the electrode of selection Y S a suitable logic signal; the closing of T1 has the effect of selecting the circuit again by connecting the control terminal C to the addressing electrode X D ; during this step, the potential of the addressing electrode is raised to the value V pol-1 so that the potential of the control terminal C takes the value V pol-1 .
  • the duration of this step is sufficiently high to charge the holding capacitor C S but sufficiently short to prevent or even limit the emission of the diode 2.
  • Step 4 de-calibration of the reference : transition to the depolarization reference, by capacitive coupling :
  • the selection switch T1 is opened by applying to the selection electrode Y S a suitable logic signal; the opening of T1 has the effect of de-coupling the control terminal C of the XD address electrode .
  • the modulator T2 begins to be depolarized in proportion to the value of V prog-pol-1 .
  • Step 5 of maintaining the circuit during the depolarization period :
  • the selection switch T1 remains open. During this step, the capacitor C S maintains the voltage of the control terminal C at a constant value, and the modulator T2 thus continues to be depolarized.
  • control circuits of the other diode lines are selected by addressing to the control terminals of these circuits the addressing signals able to depolarize the modulators of all the control circuits.
  • Reference re-calibration step 6 recovery to emission reference, by capacitive coupling:
  • the selection switch T1 is always open, the reference electrode Y R is then carried to which the terminal R 'of this circuit is connected to the reference potential for the emission V ref-E , which has the effect of by capacitive coupling between this reference terminal and the control terminal C, to restore the potential of this control terminal C to the value V pol-1 of the end of step 3.
  • the circuit is then ready for a new addressing step 1 for transmitting a new image.
  • V ref-P the value of V ref-P is adapted so that, whatever the depolarization signal V pol-1 addressed to the control of the circuit via the addressing electrode, this depolarization signal is of the same sign as the transmission signals V data-i addressed to this circuit during the transmission periods. It is thus advantageously avoided to resort to expensive means for controlling the addressing electrodes.
  • signal values are chosen.
  • V G -V S of control of the modulator T2 is lower than the trigger threshold voltage V th of this modulator; we therefore choose V pol-i such that V prog-pol-i -Vss ⁇ V th .
  • the panel according to this variant is illustrated in figure 2 . This panel includes an even number m of rows and n columns.
  • the reference electrode array comprises only two electrodes Y R1 and Y R2 . These electrodes are integrated into the active matrix of the panel. Preferably, each Y electrode R1 and Y R2 form a continuous conductive plane, shifted relative to each other.
  • the reference terminals R 'of the control circuits of the odd emitter lines are all connected to the same reference electrode Y R1 ; the reference terminals R 'of the control circuits of the pair of emitter lines are all connected to the same reference electrode Y R2 .
  • the picture frames are interlaced, each picture is divided into two frames: a frame of odd lines and a frame pairs of lines; during each frame, the control of the panel comprises the steps 1 to 6 previously described.
  • step 3 Since the depolarization addressing signals V pol-0 are identical for all the circuits of the panel, during step 3, all the lines L1, L2, ...., Lm of the panel are selected using an adapted logic signal transmitted by the corresponding selection electrodes Y S1 , Y S2 ,..., YS m , and the same addressing signal is sent to the addressing electrodes X D1 , X D2 ,. In columns C1, C2, ..., Cn. Step 3 is therefore particularly short.
  • each step 4 (reference change) of a frame is made to coincide with a step 6 (restoration of the reference for transmission) of the preceding frame; the frames are thus interlaced.
  • step 4 of an even line which corresponds to step 6 of an odd line
  • step 6 of an odd line using the rocker switch 3 of the reference electrodes, the potential of the first electrode of reference Y R1 at the potential V ref-E and the potential of the second reference electrode Y R2 at the potential V ref-P .
  • step 4 of an odd line corresponding to step 6 of an even line using the toggle switch 3 of the reference electrodes, the potential of the first reference electrode Y R1 at the potential V ref-P and the potential of the second reference electrode Y R2 at the potential V ref-E .
  • V ref-P is chosen (negative) so as to optimize the depolarization common to all modulators of the panel.
  • this embodiment is particularly economical since it requires only an additional reference electrode and a single toggle switch with respect to a panel without depolarization means, while using conventional means for controlling the column electrodes, since it allows control with addressing signals that are all of the same sign.
  • the embodiments described above relate to display panels with organic electroluminescent diodes active matrix; the invention applies more generally to all kinds of active matrix display panels, including current-controllable emitters or optical valves.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Electroluminescent Light Sources (AREA)

Claims (10)

  1. Antriebsverfahren für eine Anzeigetafel, das umfasst:
    - eine Anordnung von Lichtsendern oder von Lichtventilen,
    - eine aktive Matrix, umfassend eine Anordnung von Elektroden für die Adressierung (XD) von Spannungssignalen, eine Anordnung von Auswahlelektroden (YS), eine Anordnung von Referenzelektroden (YR), eine Anordnung von Schaltkreisen, die geeignet sind, jeden bzw. jedes der besagten Sender oder Ventile zu steuern und jeweils (1"") ausgestattet sind mit einem Steueranschluss (C), der geeignet ist, über einen Auswahlschalter (T1) mit einer Adressenelektrode (XD) gekoppelt zu werden, mit einem mit einer Referenzelektrode (YR) verbundenen Referenzanschluss (R'), und mit einem Haltekondensator (CS), der zwischen dem besagten Steueranschluss (C) und dem besagten Referenzanschluss (R') montiert ist,
    ... wobei die Steuerung des besagten Auswahlschalters (T1) mit einer Auswahlelektrode (YS) verbunden ist,
    ... wobei das besagte Verfahren umfasst:
    - Sendeperioden, während denen eine vorher festgelegte Sendespannung (Vprog-data), die eine erste Polarität aufweist, an den Steueranschluss von mindestens einem Steuerschaltkreis der besagten Tafel angelegt und gehalten wird, und eine Referenz-Sendespannung Vref-E an die Referenzelektroden (YR) angelegt wird, mit denen der (die) Referenzanschluss(-anschlüsse) (R') des mindestens einen Schaltkreises verbunden ist/sind,
    - und Depolarisierungsperioden, während denen eine vorher festgelegte Depolarisierungsspannung (Vprog-pol), die eine zweite Polarität, die der ersten Polarität entgegengesetzt ist, aufweist, an den Steueranschluss des mindestens einen Steuerschaltkreises der besagten Tafel angelegt und gehalten wird, und eine Referenz-Depolarisierungsspannung Vref-P an die Referenzelektroden (YR) angelegt wird, mit denen der (die) Referenzanschluss(-anschlüsse) (R') des mindestens einen Schaltkreise verbunden ist/sind,
    wobei jede der besagten Sende- oder Depolarisierungsperioden, für die Erlangung einer vorher festgelegten Sendespannung (Vprog-data) oder Depolarisierungsspannung (Vprog-pol) an dem Steueranschluss von jedem Steuerschaltkreis (1""), einen Adressierungsschritt umfasst, während dem ein Auswahlsignal an die Steuerung des Auswahlschalters (T1) angelegt wird, der den Steueranschluss (C) dieses Schaltkreises mit einer Adressenelektrode (XD) koppelt, und an diese Adressenelektrode (XD) ein Adressensignal (Vdata, Vpol) angelegt wird, das geeignet ist, um die besagte vorher festgelegte Spannung (Vprog-data, Vprog-pol) an dem besagten Steueranschluss (C) zu erlangen,
    - die besagte Referenz-Depolarisierungsspannung Vref-P von der besagten Referenz-Sendespannung Vref-E verschieden ist, dadurch gekennzeichnet, dass:
    - die besagte Referenz-Sendespannung Vref-E und die besagte Referenz-Depolarisierungsspannung Vref-P dergestalt ausgewählt werden, dass das besagte Adressensignal (Vdata, Vpol) die gleiche Polarität aufweist, unabhängig von der besagten Sende- oder Depolarisierungsperiode.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Anordnung von Lichtsendern oder Lichtventilen eine Anordnung von Lichtsendern ist.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass, während der Depolarisierungsperioden von Steuerschaltkreisen der Tafel, die von diesen Schaltkreisen gesteuerten Sender kein Licht aussenden.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass jede Depolarisierungsperiode einen Adressierungsschritt von mindestens einem Schaltkreis umfasst, während dem ein Auswahlsignal an die Steuerung des Auswahlschalters (T1), der den Steueranschluss (C) von jedem Steuerschaltkreis mit einer Adressenelektrode (XD) koppelt, angelegt wird, ein Adressensignal (Vpol) an diese Adressenelektrode (XD) gesandt wird, diese Depolarisierungsperiode des Weiteren umfasst:
    - am Ende des Auswahlsignals einen Halteschritt, während dem die besagte vorher festgelegte Spannung (Vprog-pol) an dem Steueranschluss (C) durch den besagten Haltekondensator (Cs) gehalten wird,
    - einen Referenz-Verstellschritt, eingeschoben zwischen dem Adressierungsschritt und dem Halteschritt dieser Periode, während dem die an dem Referenzanschluss (R') dieses Schaltkreises angelegte Spannung von der Referenz-Sendespannung (Vref-E) in die Referenz-Depolarisierungsspannung (Vref-P) übergeht, und einen Referenz-Wiedereinstellschritt, nach dem besagten Halteschritt, während dem die an den Referenzanschluss (R') dieses Schaltkreises angelegte Spannung von der Referenz-Depolarisierungsspannung (Vref-P) in die Referenz-Sendespannung (Vref-E) übergeht.
  5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass, wobei die besagten Referenzelektroden (YR) in g Gruppen zusammengefasst sind, alle Referenzelektroden (YR) von jeder Gruppe mit demselben gemeinsamen Referenzanschluss verbunden sind.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass, wobei die besagten Sender oder Ventile der Tafel auf m Reihen verteilt sind, die besagten Referenzelektroden (YR) in zwei Gruppen zusammengefasst sind, wobei eine Referenzelektrodengruppe (YR) den ungeraden Reihen und eine Referenzelektrodengruppe (YR) den geraden Reihen entspricht.
  7. Antriebsverfahren für eine Anzeigetafel nach Anspruch 6, bestimmt für die Anzeige von verschachtelten Bildern, jedes Bild aufgeteilt zwischen einem ungeraden Rahmen von Bilddaten in Bezug auf die Pixel oder Subpixel der ungeraden Reihen dieses Bildes, und einem geraden Rahmen von Bilddaten in Bezug auf die Pixel oder Subpixel der geraden Reihen dieses Bildes, wo jeder Sender oder jedes Ventil der Tafel einem Pixel oder Subpixel der anzuzeigenden Bilder zugeordnet ist, dadurch gekennzeichnet, dass,
    wobei jede Sendeperiode eines Bildes unterteilt ist in eine Sendeperiode von ungeradem Rahmen, wo die den ungeraden Reihen entsprechenden Referenzelektroden auf die besagte Referenz-Sendespannung Vref-E gebracht werden, und in eine Sendeperiode von geradem Rahmen, wo die den geraden Reihen entsprechenden Referenzelektroden auf die besagte Referenz-Sendespannung Vref-E gebracht werden,
    jede Depolarisierungsperiode ebenfalls unterteilt ist in eine Depolarisierungsperiode von ungeradem Rahmen, wo die den ungeraden Reihen entsprechenden Referenzelektroden auf die besagte Referenz-Depolarisierungsspannung Vref-P gebracht werden, und in eine Depolarisierungsperiode von geradem Rahmen, wo die den geraden Reihen entsprechenden Referenzelektroden auf die besagte Referenz-Depolarisierungsspannung Vref-P gebracht werden, und dadurch, dass jede Sendeperiode von ungeradem Rahmen mit einer Depolarisierungsperiode von geradem Rahmen übereinstimmt, und jede Sendeperiode von geradem Rahmen mit einer Depolarisierungsperiode von ungeradem Rahmen übereinstimmt.
  8. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die besagte Tafel eine Anordnung von Lichtsendern umfasst, die geeignet sind, zwischen mindestens einer Speisungsbasiselektrode PB und mindestens einer oberen Speisungselektrode PA gespeist zu werden, jeder der besagten Steuerschaltkreise eines Senders (2) einen Strommodulator (T2) umfasst, umfassend eine die Steuerelektrode (C) des besagten Schaltkreises bildende Spannungssteuerelektrode (G) und zwei den Strom leitende Elektroden (D, S), die zwischen einer der besagten Speisungselektroden (PA, PB) und einer Speisungselektrode des besagten Senders angeschlossen sind.
  9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass der besagte Strommodulator ein Transistor ist, der eine Halbleiterschicht aus amorphem Silizium umfasst.
  10. Verfahren nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass die besagten Sender Leuchtdioden sind.
EP06841465.5A 2005-12-20 2006-12-19 Antriebsverfahren für eine plasmaanzeigetafel mit depolarisierung Active EP1964093B1 (de)

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PCT/EP2006/069922 WO2007071679A1 (fr) 2005-12-20 2006-12-19 Procede de pilotage d'un panneau d'affichage avec depolarisation

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US8427404B2 (en) 2013-04-23
JP5550233B2 (ja) 2014-07-16
EP1964093A1 (de) 2008-09-03
US20090009504A1 (en) 2009-01-08
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US8659525B2 (en) 2014-02-25
TWI419105B (zh) 2013-12-11

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