JPS58104590A - Picture display - Google Patents

Abstract

PURPOSE:To confirm the color purity, by coating different luminous substances on a screen corresponding to horizontal deflection positions and displaying each color on the screen. CONSTITUTION:Switching circuits 35a-35n consist of each three analog switches 35aR, 35aG and 35aB, the control terminal is connected to pulse outputs (r), (g) and (b) of a switching pulse generating circuit 36 and signals of red, green and blue are outputted for a prescribed time. Analog switches 52-57 are connected to memories 32a-32n and when a switch 50R for control is set on and 50B, 50G are set off, the content of memory of red signals only is inputted to the switching circuits 35a-35n. Thus, through the switches 50R, 50G and 50B, an output on a screen can be done singly or through arbitrary combinations.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image display device that displays television images, and is a device that allows confirmation of the color purity of the system.

The display element used in the present invention does not have an electron gun corresponding to each color as in the conventional shadow mask type cathode ray tube, but each color has an electron beam generated by the same electron gun that is deflected in the horizontal direction. As a result, the color is reproduced by the phosphor applied to the corresponding position,
Conventionally, the purity of each color could not be confirmed independently.

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 ELfi display devices, plasma display devices, liquid crystal display devices, etc. have recently been developed as flat display devices, all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility of five-color display. However, it has not yet been put into practical use.

Therefore, we aimed to achieve a device that can display color television images on a flat display device using electron beams, and we divided the screen on the screen vertically into multiple sections. For each section, each electron beam is deflected in the vertical direction to display a plurality of lines, and further divided into a plurality of sections horizontally, and each section is divided into R-G, R-G, A television image is displayed as a whole by causing the phosphors such as B to emit light sequentially and controlling the amount of electron beam irradiation to the phosphors such as R, G, and B using a color video signal. something was invented.

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 an electron beam source, a vertical focusing electrode 3,
31, a vertical deflection electrode 4, an electron beam flow control electrode 6, a horizontal focusing electrode 6, a horizontal deflection electrode 7, an electron beam acceleration electrode 8, and a screen plate 9 are arranged, and these are made of flat glass pulp (Fig. (not shown) is housed inside an evacuated interior.

A line cathode 2 serving as an electron beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction. In the figure, only four wires 2-2 are shown). In this embodiment, it is assumed that 16 pieces are provided. Let's say 2i~2yo. These wire cathodes 2 are constructed by applying an oxide cathode material to the surface of a 10 to 20 μm tungsten wire, 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. The back electrode 1 creates a potential gradient with a vertical focusing electrode 3, which will be described later, and prevents the generation of electron beams from other line cathodes 2 other than the line cathode 2 which is controlled to emit electron beams for a certain period of time. It has the function of suppressing the electron beam and pushing the generated electron beam forward only. This back electrode 1 may be formed by a coating of electrically conductive material applied to the inner surface of the back wall of the glass pulp. Further, instead of the back electrode 1 and the a-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 collects the electron beam emitted from the line cathode 2 into the slit.
10 and vertically focused.

The slit 1o may be provided with crosspieces at appropriate intervals in the middle, or it may be a row of through holes provided in many side plates at small intervals in the horizontal direction (so that they almost touch each other). Alternatively, it may be configured as a slit.

The vertical focusing electrode 31 is also similar.

A plurality of vertical deflection electrodes 4 are arranged horizontally at intermediate positions of the slits 1o, and conductors 13, 13' are provided on the upper and lower surfaces of the insulating substrate 12, respectively.
It consists of a set of A vertical deflection voltage is applied between the opposing conductors 13 and 13/ to deflect the electron beam in the vertical direction. In this configuration example, the pair of conductors f 3 and 13' deflect the electron beam from one line cathode 2 to positions corresponding to 16 lines in the vertical direction.

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 6 are composed of conductive plates 16 each having a vertically long slit 14, and a plurality of control electrodes 6 are arranged horizontally in parallel at predetermined intervals. In this configuration example, 320 control electrode conductive plates 15a to 15n 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 a 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, Q
, B, and each control electrode 6
The R, G, and H video signals are sequentially added to the . Furthermore, 32Q sets of video signals for one line are simultaneously applied to the 320 control electrodes 6, so that one line of video 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 (32Q slits) facing oppositely to the slits 14 of the control electrode 5, and is configured to collect electrons for each picture element divided in the horizontal direction. Each beam is focused horizontally into a narrow electron beam.

The horizontal deflection electrode 7 is made up of a plurality of conductive plates 18 arranged vertically in the middle of each of the slits 16, and a horizontal deflection voltage is applied between each conductive plate 18 for each pixel. The electron beams are respectively deflected in the horizontal direction, and each of the 1't, G, and B phosphors are sequentially irradiated on the screen 9 to cause them to emit light. In this embodiment, the deflection range is the width of one pixel for each valley beam.

The acceleration electrode 8 is composed of a plurality of conductive plates 19 provided horizontally at the same position as the vertical deflection electrode 4.
The electron beam is accelerated to collide 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 temporary glass 21, and adding a metal back layer (not shown).

The phosphors 20 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. In FIG. 1, the broken lines drawn on the screen 9 indicate divisions in the vertical direction that are displayed corresponding to each of the plurality of line cathodes 2, and the two-dot chain lines correspond to each of the plurality of control electrodes 6. Indicates the horizontal division displayed. 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 1
For example, the size of one partition is 1ia+ in the horizontal direction,
The vertical direction is 16TfLI.

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 addition, in this embodiment, only one pair of R, G, and H 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 pixels 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 5, and the horizontal deflection is synchronously applied to the control electrode 5. It will be done.

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 description will be given of the driving portion that irradiates the screen 9 with an electron beam to cause the phosphor to emit light and generate a raster.

The power supply circuit 22 is a circuit for applying a predetermined bias voltage (operating voltage) to each electrode of the display element. A DC voltage of V6 is applied to the acceleration electrode 8I 3 , and a DC voltage of V9 is applied to the screen 9 (8).

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 H.

The vertical drive pulse generation circuit 26 is composed of a counter that is reset by a vertical retrace 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 [
42 mouths...Yo] is generated.

This drive pulse [49 pulses...Y] is applied to the line cathode drive circuit 26, where it is inverted and brought to a low potential only during each noggle period, and at a voltage of approximately 20 volts during the other periods. Line cathode drive made at high potential (Russ [471')
...Yo'] and each line cathode 2A.

20,...is added to 2yo. Each line cathode 2a.

・・・・・・2yo is that a current is flowing during the high potential of the drive pulses [A'~Yo'], and the drive pulses [A'~Yo'] are flowing.
The heated state is maintained so that electrons can be emitted even during the low potential period of [Y']. As a result, 16 line cathodes 2-2
From y to y, low potential drive pulses [a' to y']
Electrons are emitted only during the 16H period when . During the period when a high potential is applied, the potential at the position of the linear cathode 2 is lower than the potential at the position of the linear cathode 2 determined by the bias voltage applied to the back electrode 1 and the vertical focusing electrode 3.
Since the high potential applied to y becomes positive,
Electrons are not emitted from the line cathodes 2i to 2yo. Thus, in the line cathode 2, during the effective vertical scanning period, 16H is sequentially applied from the upper line cathode 2A to the lower line cathode 2Y.
Electrons are emitted for each period. The emitted electrons are pushed forward by the back electrode 1, pass through the opposing slits 1o 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 drive pulses [Y-Y] and counts the horizontal synchronization signal, a conversion circuit that converts the count output from D/A, etc. During the 1eH period of each vertical drive pulse [I to Y], a pair of vertical deflection signals v and v' that change in 16 steps by 1H are generated.

The vertical deflection signals V and V' both have a center voltage of v4, so that V increases sequentially and V' decreases sequentially.
They are designed to change in opposite directions. These vertical deflection signals V and 7 are applied to the electrode 13 of the vertical deflection electrode 4, respectively.
and 13', and as a result, the electron beams generated from each of the line cathodes 2i to 2yo are vertically deflected in 16 steps, and as mentioned earlier, one electron beam is reflected on the screen 9. The raster is deflected to draw 16 lines of raster one line at a time from the top.

As a result of the above, electron beams are emitted for 16H periods in order from the top of the 15 line cathodes 2A to 2Y, and each electron beam is sequentially emitted for one line from the top to the bottom within 16 times in the vertical direction. By being deflected, the screen 9
At the top, the electron beam is vertically deflected one line at a time from the 1st line at the top to the 2nd 40th line at the bottom.
A total of 240 rain rasters 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. The amount of electron beam passing through each section is controlled by a control electrode 6, and is focused in the horizontal direction by a horizontal focusing electrode 6 to become one thin 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 20 on the screen 9.

That is, the horizontal drive pulse generation circuit 28 is composed of three cascaded monostable multivibrators, etc.
Triggered by a horizontal synchronization signal, three horizontal drive pulses r, g, and b of equal pulse width are generated within one horizontal period. Here, by way of example, the width of each pulse is approximately 17μ so that three pulses r, g, b are generated during an effective horizontal scan period of 50μ.

These horizontal drive pulses r, g, and b are applied to the horizontal deflection drive circuit 29. This horizontal deflection drive circuit 29 generates a pair of horizontal deflection signals h(!:h') which are switched in three stages by being switched by the horizontal drive pulses r+q and b.The horizontal deflection signals h and h' both have a center voltage of v7.
They change in opposite directions, such that h increases sequentially and h' decreases sequentially. These horizontal deflection signals h
, h/ are electrodes 18 and 18 of horizontal deflection electrode 7, respectively.
′ is added to As a result, each horizontally divided electron beam is transmitted to the R, G, and R of the screen 9 during each horizontal period.
The beam is horizontally deflected so that the phosphor B is sequentially irradiated with 17μ crowns.

Thus, in each line raster, the horizontal 3
The electron beams are R and G for each of the 20 sections.

Each phosphor 2o of B is sequentially irradiated with light.

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 3o, 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 H 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 3.
Added to 1n. Each sample and hold circuit group 31a~
31n each 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 31H are applied to holding memory sets 32a to 32n, respectively.

On the other hand, the sampling reference clock oscillator 33 is a PLL.
(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 applied to the sampling pulse generation circuit 34, where it is delayed by one clock period by a shift register, etc., for an effective horizontal scanning period (approximately 50 μ5 ec) of the horizontal period (63.5 μ5 ec). to 32
Zero sampling pulses a to n are sequentially generated, followed by one single sending pulse. This sampling pulse a'-n corresponds to each picture element when one line of the video to be displayed is divided into 320 picture elements in the horizontal direction, and its position is always constant with respect to the horizontal synchronization signal H. controlled as follows.

These 320 sampling pulses a%n correspond to the above 320 sample and hold circuit sets 31a to 3, respectively.
1n, so that the R, G, and H video signals of each picture element when one line is divided into 320 picture elements are individually sampled in each sample-and-hold circuit set 31a to 32n. will be held. The sampled and held 320 sets of R, G, and B video signals are stored in 320 sets of memory 3 in a set of sample and hold circuits for one line.
2a to 32n all at once by a transfer pulse t,
Here, it is held for the next one horizontal scanning period.

One line of R and G stored in the memories 32a to 32n
, B video signals are applied to 320 switching circuits 35a to 35n, respectively. switching circuit 35
a to 36n are R and Ci, respectively.

Each switching circuit 358 has individual input terminals of B and a common output terminal that sequentially switches and outputs them.
The output of ~35n is used as a control signal for modulating the electron beam by the 320 conductive plates 15a of the control electrode 6 of the display element.
~15H each separately. Each of the switching circuits 35a to 35n is simultaneously controlled by switching pulses applied from the switching pulse generating circuit 36. The switching pulse generation circuit 36 receives the pulse r + from the horizontal drive pulse generation circuit 28 described above.
The switching circuits 35a to 35n are controlled by cryb, and the effective horizontal scanning period of each horizontal period is divided into three by about 50μ, and the switching circuits 35a to 35n are switched by about 17μ each.

Switching signals r and g are applied so that the G and B video signals are outputted alternately and sequentially in a time-divided manner and supplied to the control electrodes 15a to 15n.
, b.

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 irradiation of the electron beam to the R, G, and B phosphors by the horizontal deflection drive circuit 291c are completely performed in both timing and order. They are synchronously controlled to match. As a result, when the electron beam is irradiating the R phosphor, the irradiation amount of the electron beam is R
Controlled by the video signal, G and B are similarly controlled, and the light emission of the R, G, and B phosphors of each picture element is controlled by the R, G, and B video signals of that picture element, respectively. Each picture element is displayed by emitting light according to the input video signal. Such control is performed simultaneously on 320 picture elements for one line, and one line of video is displayed.
Further, the processing is performed sequentially for 240 minutes of lines starting from the upper line, and 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 displayed on this display device.

Note that the terms horizontal direction and vertical direction in the above explanation refer to the direction in which line units are displayed when displaying an image is the horizontal direction, and the direction in which the lines are stacked is the vertical direction. It is used in this sense, and is not directly related to the earthwork direction and left/right direction on the actual screen.

Although color television images can be displayed in this way, when producing such a device, it is necessary to emit light of each color independently and check the color purity.

However, as is clear from the above explanation, in conventional systems, color reproduction itself is achieved by time division within the horizontal period, in order to emit light of I(, G, and B colors alone or in any combination). This was virtually impossible due to the fact that

The object of the present invention is to provide an apparatus capable of confirming such color purity.

An embodiment of the present invention will be described with reference to FIG.

Note that parts corresponding to the example in FIG. 3 are given the same numbers.

Specifically, the switching circuits 36a to 35n each include three analog switches (35aR) to (35aR).
aB), and their analog switches (35
The control terminals aR) to (35nR) are connected to the pulse output r of the switching pulse generation circuit 36, and output signals for the first 17μ of the horizontal period. G,B
Similarly, analog switches 35aG to 35nG and 35
aB to 35nB are connected to pulse outputs q and b, respectively, and output green and blue signals of 17μ (8) each.
□ In this device, each memory 32m is provided between the memories 32a to 32n and the switching circuits 35a to aein.

(32b)...6 analog switches (52a) to (57a), (62b) for (32n)
) ~ (57b) ...... is connected, and its control's 7tC Menosui yf (soR), (50G),
(soB) is connected.

For example, as shown in FIG. 4, this switch is an analog switch 62a when the switch 50R is on and the switches (60B) and (60G) are off.

55a, 57a, . . . become conductive. In other words, only the red memory content signal is input to the switching circuit, and the ground potential is input to the green and blue signals. In other words, during the horizontal period when green and blue should be output, the voltage is at ground potential, no signal is output, and only a red signal appears on the screen. The same applies when the other switches soB and soG are turned on.

In this way, the switches (6oR), (esoG), (so
B) allows each color to be output on the screen singly or in any combination.

In this way, the present invention makes it possible to confirm the color purity in the present display device. This means that the color purity of this display device may deteriorate due to assembly precision, each electrode precision, etc., and if the beam pot diameter exceeds the specified phosphor width, color purity will be adversely affected. Therefore, it is very useful for checking them.

[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 an enlarged view of the screen, and FIG. 3 is the basic configuration of the drive circuit of the device. The block diagram shown in FIG. 4 is a circuit diagram of an image display device in an embodiment of the present invention. 2...Line cathode as an electron beam source, 3,3'
... Vertical focusing electrode, 4 ... Vertical deflection electrode, 6 ... Electron beam flow control electrode, 6 ...
...Horizontal focusing electrode, 7...Horizontal deflection electrode, 8.
...Electron beam accelerating electrode, 9...Screen, 20...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, 3o...Color demodulation circuit. 31a~31n-◆・・e・Sample and hold circuit group,
32a-32n...Memory group, 34...
・Sampling pulse generation circuit, 35a to 35n −
--... Switching circuit, 36... Switching pulse generation circuit, esoR, 50G, 60B.
...-Switch, 52a to 52n, 53a to 53n
, 54a-54n 55a-55n 5
6a ~ 5en 57a ~ 57n... Analog switch. Name of agent: Patent attorney Toshio Nakao and one other person I2
Figure level 11 minutes

Claims (1)

[Claims] The screen on the screen is vertically divided into a plurality of sections, an electron beam is generated for each vertical section, and the electron beam is sequentially deflected in the vertical direction for each vertical section to form a plurality of lines for each vertical section. In the middle of the electron beam path from the electron beam generation source to the screen, there is provided an electrode having an electron beam passing hole or slit divided into a plurality of sections in the horizontal direction, and an electrode having an electron beam passing hole or slit divided into a plurality of sections in the horizontal direction. An electrode is provided to deflect the beam horizontally, and different phosphors or other luminescent materials are applied on the screen corresponding to the horizontal deflection position, so that color reproduction is possible by horizontal deflection, and each color on the screen is An image display device characterized by being able to display images singly or in an arbitrary combination.