JPS5884580A - Picture display - Google Patents

Abstract

PURPOSE:To make the boundary part of divided sections not remarkable, by shifting horizontally the position of fluorescent substance coated on the divided sections of odd and even number orders adjacent with each other on a screen. CONSTITUTION:The position of a fluorescent substance 20 coated to each of odd and even number order of divided sections adjacent with each other on a screen 9 is shifted horizontally. Non-illuminating parts 20' are formed among the fluorescent substances 20. Accompanied with the shift of the position of the fluorescent substances 20 for each section, a horizontal deflection signal is applied to each conductor plate of the horizontal deflection electrodes by the voltage corresponding to the shift extent to change the horizontal deflection position of electron beams for each section.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention vertically divides a screen into a plurality of sections and generates an electron beam for each section.
This relates to a device that displays a television image as a whole by deflecting each electron beam in the vertical direction for each segment to display a plurality of lines, so that the boundaries between the vertical segments are not noticeable on the screen. The object of the present invention is to provide a device that can display images on the screen.

Conventionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a very long depth compared to the screen size, making it difficult to create thin television receivers. It was impossible to do so. In addition, although EL display elements, plasma display devices, liquid crystal display elements, etc. have recently been developed as flat display elements, all of them are insufficient in terms of performance such as brightness, contrast, and color display, and have not been put into practical use. It has not yet been reached.

Therefore, in order to achieve a flat display device using electron beams, the screen on the screen is vertically divided into multiple sections and an electron beam is generated for each section. A device was devised in which an electron beam was deflected vertically to display multiple lines, which collectively displayed a television image.

First, a basic configuration example of the image display element used here will be explained with reference to FIG.

This display element includes, in order from the back to the front, a back electrode 1, a line cathode 2 as a beam source, and vertical focusing electrodes 3, 3'.
, a vertical deflection electrode 4, a beam flow control electrode 6, a horizontal focusing electrode 6, a horizontal deflection electrode 7, a beam acceleration electrode 8, and a screen plate 9. The interior is housed in a vacuum.

A line cathode 2 serving as a beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction, and a plurality of line cathodes 2 (here, (Only four wires, 2i to 22 are shown) are provided. In this embodiment, it is assumed that 15 pieces are provided. Let's call them 2i~2yo. These wire cathodes 2 are constructed by applying an oxide cathode material to the surface of a tungsten wire having a diameter of 10 to 2 .mu..phi., for example. Then, as will be described later, the electron beams are controlled to be emitted sequentially from the upper line cathode 2a for a fixed period of time.

This functions to suppress the generation of electron beams from other line cathodes 2 other than the line cathode 2 that is controlled as desired, and to push out the generated electron beams only in the forward direction. This back electrode 1 may be formed by a coating film of a conductive material adhered to the inner surface of the rear wall of the glass pulp. Further, instead of the back electrode 1 and the linear cathode 2, a planar electron beam emitting cathode may be used.

The vertical focusing electrode 3 is a conductive plate 11 having a horizontally long slit 1o facing each of the line cathodes 2a to 2yo, and takes out the electron beam emitted from the line cathode 2 through the slit 1o, and vertically focus in a direction.

The slit 1o may be provided with crosspieces at appropriate intervals in the middle, or it may be a row of through holes arranged horizontally at small intervals (nearly touching each other). It may also be configured as a slit.
The same applies to the r vertical focusing electrode 3''.

A plurality of vertical deflection electrodes 4 are arranged horizontally in the middle of each of the slits 1o, each of which has a conductor 13, 13' provided on the upper and lower surfaces of the insulating substrate 12. has been done. Then, a vertical deflection voltage is applied between the opposing conductors 13 and 13',
Deflect the electron beam vertically. In this embodiment, a pair of conductors 13, 13' are used. 1' The electron beam from one line cathode 2 is deflected vertically to a position corresponding to 16 lines.

The 16 vertical deflection electrodes 4 constitute 16 pairs of conductors corresponding to each of the 16 line cathodes 2, and in the end, the electron beam is deflected to draw 240 horizontal lines on the screen 9. do.

Next, the control electrodes 5 are composed of conductive plates 16 each having a vertically long slit 14, and a plurality of control electrodes 16 are arranged in parallel in the horizontal direction at predetermined intervals. In this embodiment, 320 control electrode conductive plates 15a to 16m are provided (only 10 are shown in the figure). Each of the control electrodes 6 separates and extracts the electron beam into one picture element in the horizontal direction, and controls the amount of electron beam passing therethrough in accordance with the video signal for displaying each picture element.

Therefore, if 32020 control electrodes 6 are provided, 320 picture elements can be displayed per horizontal line.

In addition, in order to display images in color, each picture element is R, G.
, B, and each control electrode 6
The R, G, and B video signals are sequentially added to the . In addition, 320 sets of video signals for one line are simultaneously applied to the 320 control electrodes 16, and the video for one line is displayed at one time.

The horizontal focusing electrode 6 is composed of a conductive plate 17 having a plurality of vertically long slits 16 (320 slits) opposite to the slits 14 of the control electrode 6. Each electron beam is focused horizontally into a narrow electron beam.

The horizontal deflection electrode 7 is composed of a plurality of conductive plates 18 and 18' arranged vertically in sets of two in the middle of each of the slits 16, between which a horizontal deflection voltage is applied. The electron beam for each picture element is deflected in the horizontal direction, and the R, G, and B phosphors are sequentially irradiated on the screen 9 to cause them to emit light. 6. The deflection range is as follows. , in this embodiment, the width is one pixel for each electron beam. 320 sets of the conductive plates 18, 18' are provided, which is the same number as the conductive plates 16a to 16m of the control electrode 6.

The accelerating electrode 8 is composed of a plurality of conductive plates A9 provided horizontally at the same position as the vertical deflection electrode 4, and accelerates the electron beam so that it collides with the screen 9 with sufficient energy.

The screen 9 is constructed by applying a phosphor 20 that emits light when irradiated with an electron beam to the back surface of a glass plate 21, and adding a metal back layer (not shown).

The phosphors 2o are provided with one pair of phosphors of three colors R9G and H for each slit 14 of the control electrode 6, that is, for each horizontally divided electron beam. It is applied in vertical stripes.

The broken lines drawn on the screen 9 in FIG. 1 indicate divisions in the horizontal direction that are displayed corresponding to the vertical directions that are displayed corresponding to the plurality of line cathodes 2, respectively. As shown in the enlarged view in Figure 2, one section partitioned by these two has R, G, and B phosphors 2o for one pixel in the horizontal direction, and 16 lines in the vertical direction. It has a width of For example, the size of one section is 1 in the horizontal direction.
Similarly, there are 16 fins in the vertical direction.

Note that in FIG. 1, the length in the horizontal direction is greatly enlarged relative to the length in the vertical direction for clarity.

In this embodiment, only one pair of R, G, and B phosphors 20 for one picture element is provided for one control electrode 6, that is, one electron beam, but for two or more picture elements, Of course, two or more pairs of picture elements may be provided; in that case, R, G, and B video signals for two or more picture elements are sequentially applied to the control electrode 6, and in synchronization with this, the horizontal side Direction will be made.

Next, the basic configuration of a drive circuit for displaying television images on this display element will be explained with reference to FIG. First, a driving portion for irradiating the screen 9 with an electron beam to emit raster light will be explained.

The power supply circuit 22 is a circuit for applying a predetermined bias voltage (operating voltage) to each electrode of the display element, with -v1 applied to the back electrode 1, v3°V31 . A DC voltage of v6 is applied to the water focusing electrode 6, a DC voltage of v8 is applied to the accelerating electrode 8, and a DC voltage of v9 is applied to the screen 9.

Next, a composite video signal of a television signal is applied to the input terminal 23, and a synchronization separation circuit 24 separates and extracts a vertical synchronization signal V and a horizontal synchronization signal H7.

The vertical drive pulse generation circuit 25 is composed of a counter that is reset by a vertical pulse and counts horizontal pulses, and has an effective vertical scanning period (here, a period of 240H) excluding the vertical retrace period of the vertical period. 16 drive pulses each having a length of 16H period [41
Mouth...Yo] occurs. This drive pulse [42 pulses...Y] is applied to the line cathode drive circuit 26, where it is inverted so that it is at a low potential only during each pulse period, and at a high potential of approximately 20 volts during the other periods. It is converted into a line cathode driving pulse [A'9'...P],
Each line cathode 2a, 20.・・・・・・Added to 2yo.

Each line cathode 2a.

・・・・・・2yo is heated by flowing current during the high potential period of the driving pulse [A' to YO'], and is heated even during the low potential period of the driving pulse [A' to YO']. The heated state is maintained so that electrons are emitted. As a result, each of the 16 line cathodes 2A to 2Y receives a low potential driving pulse [I'
~yo'] is applied (16) (electrons are emitted only during the period when the high potential is applied. Since the high potential applied to the linear cathodes 2, 2, and 2 is more positive than the potential at the position of the linear cathodes 2, no electrons are emitted from the linear cathodes 2, 2, 2, and 2.

Thus, in the line cathode 2, electrons are emitted from the upper line cathode 2a toward the lower line cathode 2y in order for 16H periods during the effective vertical scanning period.

The emitted electrons are pushed forward by the back electrode 1, pass through the opposing sleeves 10 of the vertical focusing electrode 3, and are focused in the vertical direction to form a flat electron beam.

Next, the vertical deflection drive circuit 27 is composed of a counter that is reset by each of the vertical drives and mills, and counts horizontal synchronizing signals, and a conversion circuit that converts the count output into D/A. A pair of vertical deflection signals v and v' are generated that change in 16 steps by 1H during the 16H period of the drive pulse [I to Y]. The vertical deflection signals V and 7 both have a center voltage of v4, and are made to change in opposite directions so that V increases sequentially and vl decreases sequentially. These vertical deflection signals V and V' are applied to electrodes 13 and 1 of vertical deflection electrode 4, respectively.
3', so that each line cathode 2-2
The electron beam generated from Y is vertically deflected in 16 steps, and as mentioned earlier, on the screen 9, one electron beam scans 16 lines of raster one by one from the top.
It is deflected to draw line by line.

Electron beams are sequentially emitted for 16H periods, and each electron beam is deflected one line at a time from top to bottom within 15 sections in the vertical direction. 240th of the lower end from
The electron beam is vertically deflected one line at a time up to the first line, and a total of 240 raster lines are drawn.

The electron beam thus vertically deflected is horizontally divided into 320 sections by the control electrode 6 and the horizontal focusing electrode 6 and extracted. Figure 1 shows one of these categories. This electron beam is controlled by the control electrode 5 for the amount of passage f for each section, and is focused in the horizontal direction by the horizontal-flux electrode 6 to become one narrow electron beam.
The light is deflected horizontally in three stages by the horizontal deflection means described below, and is sequentially irradiated onto each of the R, G, and B phosphors 2° on the screen 9.

That is, the horizontal drive pulse generation circuit 28 is composed of three cascaded monostable multivibrators, etc.
Triggered by the horizontal synchronization signal, three horizontal drive pulses r? with equal pulse width are generated in one horizontal period. 9
+b is generated. Here, as an example, three pulses r, g, and b are generated during an effective horizontal scanning period of 60 μ89G, with each pulse width being about 17 μsec. Those horizontal drive pulses r,
g and b are applied to the horizontal deflection drive circuit 29. This horizontal deflection drive r port + path 29 receives water drive pulses r, q, b(c
Therefore, a pair of horizontal deflection signals 1 and h' which are switched and change in three stages are generated. Both horizontal deflection signals and h' have a center voltage of v7, h increases sequentially, and h'
, and so on, change in opposite directions. These horizontal deflection signals h/ are applied to electrodes 18 and 18' of horizontal deflection electrode 7, respectively. As a result, each horizontally divided electron beam is horizontally deflected so as to sequentially irradiate the R, G, and B phosphors of the screen 9 by 17 μsea during each horizontal period. However, in the display element shown in FIG. 1, one conductor 18 or 18' is used in the water deflection electrode 7 to deflect two adjacent sections of electron beams. Therefore, if the electron beams in 320 sections are deflected in the order of R-G-H, then the electron beams in the even-numbered sections are deflected in the order of R-G-H. are deflected in the opposite direction every other segment, such as in the order of BGH.

Thus, in each line raster, the horizontal 3
An electron beam is sequentially irradiated onto each of the R, G, and B phosphors 2o for each of the 20 sections.

Therefore, for each horizontal section of each line, the R and G electron beams are
, B, a color television image can be displayed on the screen 9.

Next, the modulation control portion of the electron beam will be explained.

First, the composite video signal applied to the television signal input terminal 23 is applied to the color demodulation circuit 30, where the R-Y
and B-Y color difference signals are demodulated, the G-Y color difference signals are matrix-synthesized, and further, they are combined with the luminance signal Y to generate R, G, and B primary color signals (hereinafter referred to as R, G, A B video signal) is output. These R, G, and B video signals are processed by 320 sample and hold circuit sets 31a to 320.
31n gave me 0 shares. Each sample and hold circuit group 31
Each of a to 31n has three sample and hold circuits for R, G, and B. The sample and hold outputs of these sample and hold circuit sets 31a to 31n are applied to holding memory sets 32a to 32n, respectively.

On the other hand, the sampling reference clock oscillator 33P
It is composed of an LL' (phase locked loop) circuit, etc., and generates a reference clock of approximately 6.4 MHz in this embodiment. The reference clock is controlled to always have a constant phase with respect to the horizontal synchronizing signal H. This reference clock is used by the sampling pulse generation circuit 3.
4, and here clock 1 is added to clock 1 by the nft register.
The horizontal period (63,6μ5e
Sampling pulses a-n of c) are generated sequentially, and one transfer pulse is then generated. This sampling pulse a-n corresponds to each picture element when one line of the video to be displayed is divided horizontally into 320 picture elements, and its position is always constant with respect to the horizontal synchronizing signal H. controlled by.

These 320 sampling pulses a-n are connected to the 320 sample-and-hold circuit sets 31a to 3In, respectively.
is added to each sample-and-hold circuit set 3.
In 1a to 32n, R, G, and B video signals of each picture element when one line is divided into 320 picture elements are individually sampled and held. The sampled and held 320 sets of R, G, and B video signals are stored in the memory 32a after the sample and hold for one line is completed.
~32c, they are transferred all at once by a transfer pulse t, and are held here for the next one horizontal period.

One line of R, G stored in the memories 32a to 32n
, B video signals are applied to 320 pulse width modulation circuit sets 37a to 37n, where the reference pulse signal is pulse width modulated according to the magnitude of the sampled and held R-G-B video signal. Output. It is desirable that the repetition period of the reference pulse signal is sufficiently smaller than the pulse width of the horizontal drive pulse y @q @l) in the horizontal deflection circuit, for example, 1:
A ratio of about 10 to 1:100 is used.

The output signals of the pulse width modulation circuit sets 37a to 37n are as follows:
They are added to switching circuits 35a to 35n, respectively. The switching circuits 35a to 36n are R and G respectively.
・It has individual input terminals of B and a common output terminal that sequentially switches and outputs them, and each switching circuit 35
The outputs of a to 35n are used as control signals for modulating the electron beam to the 320 conductive plates 15 of the control electrode 6 of the display element.
Each of a to 15n is individually added. Each switching circuit 35a to 36n is a switching pulse generation circuit 3
Switching is simultaneously controlled by switching pulses applied from 6 to 6. The switching pulse generation circuit 36 receives pulses r, g,
The switching circuits 35a to 36n are controlled by dividing approximately 50μ8ec in the central portion of each horizontal period into three and switching circuits 35a to 36n for each approximately 17μsea, and output R, G, and H video signals alternately and sequentially in time division. and control electrode 15a
Switching signals r, q, and b are generated to be supplied to 15n. However, among the switching circuits 35a to 35n, odd-numbered switching circuits 35a, 36c...
. . are switched in the order of RG-, B, and the even-numbered switching circuits ssb, 3sd, . . . 36n are switched in the order of B to GH.

What should be noted here is that the switching circuits 35a to 3
The switching of the supply of R, G, and B video signals at 5n and the horizontal deflection of the horizontal deflection of the electron beam R, G, and B irradiation onto the phosphor by the horizontal deflection drive circuit 29 are completely consistent both in timing and order. It is controlled synchronously so that As a result, when the R phosphor is irradiated with the electron beam, the irradiation amount of the electron beam is controlled by the R video signal, and G and B are similarly controlled, so that 1(, G, The light emission of each B phosphor is controlled by the R, G, and B video signals of that picture element, and each picture element is displayed by emitting light according to the input video signal.Such control is performed for one line. The process is performed simultaneously for 320 picture elements to display one line of video, and the process is performed sequentially for 240 minutes starting from the upper line, so that one video is displayed on the screen 9.

The above operations are performed on one input television signal.
This is repeated for each field, and as a result, a moving television image is displayed on the screen 9 in the same way as a normal television receiver.

As described above, television images are projected on this display device, but in order for this device to display images well on the screen, the boundaries between the vertically divided sections must be smooth. The boundary between the image segment assigned to one line and the image segment assigned to the next line cathode may have a gap due to the assembly precision of the display element or variations in the vertical deflection width. Or, - on a streetcar, a band-shaped area with increased brightness forms, which seriously interferes with the image.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a device that can eliminate such inconveniences and make the boundaries between divided sections less noticeable. It is characterized by being made to shift.

An enlarged view of the screen 9 of the device according to an embodiment of the present invention is shown in FIG.
As shown in the figure. As is clear from the figure, the position of the phosphor 20 applied to each of the adjacent odd-numbered divisions and even-numbered divisions on the screen 9 is made to slide in the horizontal direction. In addition, each phosphor 2
A non-light-emitting portion 20' that does not emit light is formed between the zero lines. This non-light emitting part 3e will be more effective if it is made of a black material that absorbs external light.

The position of the phosphor 2o is shifted in each section in this way ('Therefore, the horizontal deflection position of the electron beam is also changed in each section by the shifted amount). Apply the above-mentioned horizontal deflection signal to each conductive plate 18 and 18' of 7, and apply a signal obtained by adding a voltage corresponding to the shifted amount to h' for each section.The remaining circuit example is shown in the fifth section.
As shown in the figure. Here, among the vertical drive pulses [I to Y] from the vertical drive pulse generation circuit 26, the pulses for odd number divisions [A, H, H...] are added to the OR gate 37, and the pulses for even number divisions [I, H, ...] are added to the OR gate 37. 2.OR game)
In addition to 38, switching pulses are taken out during display periods of odd and even segments, respectively. Then, the switching pulse is applied to the analog gates 39 and 40, and the position control voltage for odd numbered sections from the variable resistor 41 and the position control voltage for even numbered sections from the variable resistor 42 are alternately applied for each section. Take it out. The respective voltages are applied to the conductor plate 18 or 1Ef of the horizontal deflection electrode 7 in addition to the vertical deflection signal h' by the combining circuit 43. The variable resistor 41 is adjusted so that each electron beam correctly irradiates the phosphor 2o in odd-numbered sections, and the variable resistor 42 is adjusted so that each electron beam correctly irradiates the phosphor 2o in even-numbered sections.

According to such a configuration, each phosphor 2o is correctly irradiated with the electron beam on the screen 9 in any divided section, and a predetermined image is displayed. , along with
Even if there is uneven display between adjacent sections as shown in Figure 4 above, the width of the vertical deflection in each section is made slightly thicker to prevent gaps from forming at the boundary. If this is done, even if the electron beam irradiates an adjacent section due to excessive deflection, the electron beam (shown with diagonal lines in the figure) will irradiate the non-light-emitting part 20' in the adjacent section, resulting in an unnecessary This means that no light emission will occur.

Therefore, the boundary portion does not stand out as a bright or dark horizontal line, and a uniform, easy-to-see, and good image can be displayed over the entire surface of the screen 9.

In addition, in the above embodiment, the position of the phosphor between adjacent divided sections is set to one half of the repeating interval of the phosphor.
Although the position is shifted by a considerable amount, it is most effective to shift the position by half, but other amounts may be used. Further, instead of shifting the position all at once at the boundary portion, the position may be gradually shifted by a small amount over a width of several lines at the boundary portion.

As described above, according to the present invention, in a device that displays an image by vertically dividing a screen into a plurality of sections and irradiating each section with a phosphor using an electron beam, the boundaries of the sections are It is possible to display a uniform and good image over the entire area by eliminating bright or dark band-like hail in some areas.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the basic configuration of an example image display element used in the image display device of the present invention, FIG. 2 is a close-up view of the screen, and FIG. 3 is the basic configuration of the drive circuit of the device. FIG. 4 is a front view of a part of the display state of the screen, and FIG. 6 is a circuit diagram of the main part of the image display device path in one embodiment of the present invention. 2... Line cathode as an electron beam source, 3.3'...
... Vertical focusing electrode, 4 ... Vertical deflection electrode, 5
...Electron beam flow control electrode, 6-...Horizontal focusing electrode, 7...Horizontal deflection electrode, 8...Electron beam acceleration electrode, 9... Image on screen o.
...Fluorescent material, 23...Input terminal, 24.
... Synchronization separation circuit, 26 ... Vertical drive pulse generation circuit, 26 ... Line cathode drive circuit, 27
... Vertical deflection drive circuit, 28 ... Horizontal drive pulse generation circuit, 29 ... Horizontal deflection drive circuit, 3
0...Color demodulation circuit, 31a to 31n...
・Sample and hold circuit group, 32a to 32n...
・Memory group, 34..., ・Sampling pulse generation circuit, 35a to 35n...Switching circuit,
36...Switching pulse generation circuit, 20'
...Non-light emitting part, 37.38...OR gate,
39,40...Analog gate, 41°42.
...Variable resistor, 43...Synthesis circuit.
[Name of agent: Patent attorney Toshio Nakao and one other person] 2 Figures for tit! classification

Claims (1)

[Claims] The screen on the screen is vertically divided into a plurality of sections, an electron beam generation source is provided in each section to generate an electron beam, and a plurality of electron beam sources are provided in each section so as to sandwich the path of the electron beam. vertical deflection means, applying a vertical deflection signal to each vertical deflection means to vertically deflect said electron beam to display a plurality of lines within each segment; An image display device characterized in that the position of the phosphor is shifted for each adjacent section of the plurality of sections.