JPH0472889A - Picture display device and its adjusting device - Google Patents

Abstract

PURPOSE:To automatically obtain highly uniform rasters by automatically generating a deflecting waveform so that each electron beam spot is placed between carbon black of stripes or broken lines in the horizontal direction or in the center of each phosphor. CONSTITUTION:Phosphors 50R, 50G, and 50B of three primary colors R, G, and B are applied like stripes in the vertical direction on a screen, and carbon black of stripes or broken lines 51 and 52 or light non-emitting material are applied with the scanning line pitch in the horizontal direction on the screen, and a vertical deflecting voltage waveform adjusting device of a picture display device is provided. The output of a photodetector and the vertical deflecting voltage are stored for all allowable values of the vertical deflecting voltage. The output of the photodetector is minimum when the electron beam passes light non-emitting parts 51 and 52; and it is maximum when the electron beam passes between light non-emitting parts. The vertical deflecting voltage for the maximum output is obtained. This operation is executed for the whole of the screen to generate an accurate vertical deflecting waveform.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention divides a screen on a screen into a plurality of sections vertically and horizontally, generates an electron beam for each section, and generates an electron beam for each section. The present invention relates to an image display device that displays a television image as a whole by deflecting an electron beam in the vertical and horizontal directions to display a plurality of scanning lines, and an adjustment device thereof.

BACKGROUND OF THE INVENTION First, a basic configuration of an image display device used here will be explained with reference to FIG.

This display device includes, in order from the back to the front anode side, a back electrode 1, a line cathode 2 as an electron beam generation source,
electron beam extraction electrode 3, electron beam flow control electrode 4,
A focusing electrode 5, a horizontal deflection electrode 6, a vertical deflection electrode 7, a phosphor screen plate 8, etc. are arranged to form a structure, and these are housed inside a flat vacuum container (not shown).

The line cathode 2 as an electron beam generation source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction. Here, only seven (2i to 21-) are shown). In this embodiment, it is assumed that the linear cathodes are spaced in three order and that there are 30 linear cathodes, and the linear cathodes are numbered 2-27. The distance between the line cathodes 2 is not allowed to be increased freely, but is regulated by the distance between the vertical deflection electrode 7 and the screen 8, which will be described later. These wire cathodes 2 are constructed by coating the surface of a tungsten wire with a diameter of 10 to 30 μm, for example, with an oxide cathode material.

Then, as will be described later, the electron beams are controlled to be emitted from the upper line cathode 2i to the lower line cathode 27 in sequence at a constant time +ilj.

The back electrode 1 suppresses the generation of electron beams from line cathodes 2 other than the line cathode 2 that is controlled to emit electron beams for a certain period of time, and directs the generated electron beams only toward the anode. It also has the effect of pushing it out. This back electrode 1 may be constructed using the inner surface of the rear wall of the vacuum container.

The beam extraction electrode 3 is a conductive plate 11 having a large number of through holes 1o arranged at predetermined intervals in the horizontal direction facing each of the line cathodes 2a to 27, and conducts the electron beam emitted from the line cathode 2. It is taken out through the through hole 10.

Next, the control type ('i@4 is composed of a vertically long conductive plate 15 having through holes 14 at positions facing each of the line cathodes 2-27, and a plurality of conductive plates arranged horizontally at predetermined intervals. In this configuration, 120 conductive plates 15a to 15n for control electrodes are provided (only 8 are shown in the figure).

This control electrode 4 controls the amount of passage of each of the electron beams divided horizontally by the beam extraction electrode 3 in accordance with a video signal for displaying each picture element. One line of video is displayed on the 120 control electrodes 4 at one time.

The focusing electrode 5 is connected to each through hole 14 provided in the control electrode 4.
The conductive plate 17 has a through hole 16 at a position facing the control electrode 4, and focuses the electron beam that has passed through the through hole 14 provided in the control electrode 4.

The horizontal deflection electrodes 6 include a plurality of conductive plates 18 arranged vertically at positions on both sides of the through hole 16 in the horizontal direction.
, 18', each electrode 18.1
A voltage for horizontal deflection is applied to the screen 8', and the electron beam of each picture element is deflected in the horizontal direction.
In step 2, the R, G, and B phosphors are sequentially irradiated to emit light. In this configuration example, the deflection range is a width of two picture elements for each electron beam.

The vertical deflection electrodes 7 include a plurality of conductive plates 19 and 19' arranged horizontally at intermediate positions between the through holes 16.
A vertical deflection voltage is applied to each electrode 19, 19' to deflect the electron beam in the vertical direction. In this configuration example, the electron beam generated from one line cathode is vertically deflected into eight lines by a pair of electrodes 19 and 19'. Then, by the vertical deflection electrode 7 composed of 31 pieces, 30 lines corresponding to each of the 30 line cathodes
A column of vertical deflection conductor pairs is constructed, resulting in a screen 8
The electron beam is deflected so as to draw 240 horizontal scanning lines vertically upward. The electron beam is mainly bent in the space between the horizontal and vertical deflection electrodes 6, 7 and the screen 8, but the entire screen is deflected with a sufficient amount of deflection compared to the distance in this space so that large deflection distortion does not occur. The screen is divided so that it can be configured.

The screen 8 is constructed by coating the back surface of a glass plate 21 with a phosphor 2o that emits light when irradiated with an electron beam, and adding a metal back layer (not shown) if necessary. The phosphor 2o is located in one through hole 1 of the control electrode 4.
In other words, for each electron beam divided horizontally, two pairs of phosphors of the three primary colors R, G, and B are provided, and a nutripe-shaped phosphor is provided vertically. is coated on. The broken lines drawn on the screen 8 in FIG. 7 indicate vertical divisions 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 4. Indicates the horizontal division that will be displayed. As shown in the enlarged view in Figure 8, one section partitioned by both of them has two picture elements of R and G in the horizontal direction.
, B, and has a width of 8 lines in the vertical direction. The size of one section is, for example, 1 mm in the horizontal direction and 3 mm in the vertical direction. R,G.

The three color B phosphors may be applied in an arrangement other than vertical stripes, for example, in a delta arrangement.

It should be noted that in FIG. 7, the length in the horizontal direction is expanded to about twice the length in the vertical direction to make it easier to understand.

In addition, in this configuration, two pairs of R, G, and B phosphors 2o are provided for one control electrode 4, that is, one electron beam, for two picture elements, but of course, one picture element or three More than one picture element may be provided, and in that case, R, G, and B video signals of one picture element or three picture elements or more are sequentially applied to the control electrode 4, and horizontal deflection is performed in synchronization with the R, G, and B video signals. Furthermore, the phosphors of the three colors RlG and H may be applied in an arrangement other than vertical stripes, for example, in a delta arrangement.
In that case, apply horizontal and vertical deflection voltages that are compatible with the phosphor arrangement.

Next, the basic configuration of a drive circuit for displaying an image on this display element will be explained with reference to FIG. First, a driving portion for irradiating the screen 8 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;
A DC voltage of v6 is applied to the screen 8, and a DC voltage of v8 is applied to the screen 8.

The line cathode drive circuit 26 uses the vertical synchronization signal V and the horizontal synchronization signal H to create line cathode drive pulses [I to M]. FIG. 10 shows the relationship between the vertical synchronizing signal (2), the horizontal synchronizing signal H, and the line cathode drive pulses [I to M]. Each line cathode 2-27
is heated by a current flowing through it during the high potential of the drive pulse [I to Ma], and the heated state is maintained so that electrons can be emitted during the low potential period of the drive pulse [I to Ma]. .

As a result, electrons are emitted from the 30 line cathodes 2a to 27 only during the 8H period in which the low potential drive pulses [i to ma] are applied to each of them. During the period when a high potential is applied, the potential applied to the line cathodes 2-27 is higher than the potential at the position of the line cathode 2 determined by the bias voltage applied to the back electrode 1 and the beam extraction electrode 3. Since the higher potential is positive, no electrons are emitted from the line cathodes 2a-27. Thus, the line cathode 2 odor 10
- During the effective vertical scanning period, electrons are sequentially emitted from the upper linear cathode 2a to the lower linear cathode 27 for 8H periods. Next, the deflection portion will be explained.

In FIG. 9, the deflection voltage waveform generation circuit 40 includes a direct memory access controller (hereinafter referred to as DMA controller) 41, a deflection voltage waveform storage memory (hereinafter referred to as deflection memory) 42, and a digital-to-analog converter (hereinafter referred to as D/A converter) 4sh. , 437, and the vertical deflection signal v
, v' and horizontal deflection signals, h/. In this configuration, regarding vertical deflection signals, there are two sets of memory address areas for storing vertical deflection signals corresponding to each scanning line of 24OH, and regular data is stored in the memory every 8H minutes. Therefore, eight levels of vertical deflection signals can be obtained for two fields. Also,
Regarding the horizontal deflection signal, as described below, it is necessary to horizontally deflect the electron beam in 6 stages within 1H period, so 6 signals are generated during 1H, and 240H x 6/H during 1V:
There is a memory address area corresponding to each of 1440 horizontal deflection waveforms, and by storing regular patterns in the memory every 1H, it is possible to obtain a 6-step wave horizontal deflection signal.

As shown in the double series, one of the line cathodes 2-27 to which a low-potential driving pulse is applied during the effective scanning period (in this case, a period of 24 OH) excluding the vertical retrace period of the vertical period. The electron beam emitted from the line cathode is horizontally divided into 120 sections by the beam extraction electrode 3, and extracted as 120 electron beam rows. The amount of the electron beam passing through each section is controlled by the control electrode 4 as described later, and after being focused by the focusing electrode 5, a pair of horizontal deflection signals that change in six stages as shown in FIG. , h/ are added to the horizontal deflection electrode 18,1
8', the RGB of screen 8 during each horizontal period
and R2, G2. B2 (Control 1+ The phosphors corresponding to 15a to 15n of the control electrode 5 are R, G, and B for two picture elements, but for convenience of explanation, one picture element is R1, G1.B1, and the other is R2. The phosphors of 2°G2.B2) are sequentially irradiated with H/e. Thus, in the raster of each scanning line, the electron beam is divided into R1, G1, . B1 and R2,G
2. Each phosphor 2Q of B2 is sequentially irradiated with light. Therefore, for each horizontal section of each scanning line, the electron beam is
A color image can be displayed on the screen 8 by modulating with the 1 and R2, G2°Bp video signals.

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

First, in FIG. 9, the signal input terminal 23R923G,
Each primary color signal of R, G, and B added to 23B (hereinafter referred to as R
, G, and B video signals) are applied to 120 sample-and-hold circuit sets 31a to 31n. Each sample-and-hold circuit group 31a-31n is composed of six sample-and-hold circuits for R, G, B1, R2, G2, and B2. Sampling parnu start No. 1; the circuit 34 has a horizontal period (63, 61tscx
, ) during the effective horizontal scanning period (approximately 50μ5ec), the 120 sample and hold circuit sets 31a to 3
1n for R, G, B1 and R2, G
1 2 corresponding to the sample hold circuit for 2 and B2
0X6=720 sampling parnu Ra1~Bn2
occur sequentially. The 720 sampling parnu R
Six pieces of a1 to Bn2 are added to each of the 120 sample and hold circuit sets 31a to 31H, and as a result, each sample and hold circuit set has the capacity for two picture elements when one scanning line is divided into 120 pieces. R1, G1. B,
and R2, G2. Each B2 video signal is individually sampled and held. The sample-held 120 pairs of R1, G1, B1 and R2°G2. B
The video signal of 2 is 1 after the sample halt for 1 scanning line is completed.
The memo data is transferred all at once to the 20 sets of memo IJs 32a to 32n by a transfer pulse t, where it is held for the next horizontal scanning period. These R1, G1. B1 and R2, G2
．． The signal of B2 is sent to 120 switching circuits 35a to 3.
Added to 5n. Switching circuits 35a to 35nU
14 - R1, Cil, B1 and R2, G2. B2
The circuit has individual input terminals and a common output terminal for sequentially switching and outputting these input terminals. Each of the switching circuits 368 to 35n has switching pulses y and r applied from the switching pulse generation circuit 36.
, g b and r2 + G2 + B21
Switching is controlled simultaneously by 1 l 1 .

The switching pulses r, gb and J: H2°1 1 + 1 G2''2 divide each horizontal period into 6 and switch the switching circuits 35a to 35n by H/6, R1°G1.
B1 and R2, G2. The switching signals r1+q1+b1 . r2. q2.
Generate B2.

The output of each switching circuit 35a-35n is applied to 120 sets of pulse-width modulation (PWM) circuits 37a-37n, where the sample holes 7'vR1, G1 .
B1oJ:Hici2+"2 Each image M (7J) is pulse width modulated according to the size and output. The outputs of the pulse width modulation circuits 37a to 37n are used as control signals for modulating the electron beam. It is applied individually to each of the 120 conductive plates 15a to 15n of the control electrode 4 of the display element.

What should be noted here is that the switching circuit 35a-3
R1.5n. G1. B1 and R2°G2. B2
, and the horizontal deflection drive circuit 41 switches the supply of video signals to the electron beams R1, G1 . B1 and R2, G2. B
The irradiation switching and horizontal deflection to the phosphors in step 2 are synchronously controlled so that they completely match both in timing and order. Due to this, the electron beam is R
When the G1 phosphor is irradiated, the irradiation amount of the electron beam is controlled by the R video signal. B1 and R2, G2. B2 is similarly controlled, and R1, G1 . B1 and R2, G2. B2 The light emission of each party light is caused by the R1, G1 . B1 and R2,G
Each picture element is controlled by a 2°B2 video signal, and each picture element is displayed by emitting light according to the input video signal. Such control is simultaneously executed for 120 sets (2 picture elements each) for 1 scanning line, and 24 pixels for 1 scanning line.
An image of 0 picture elements is displayed, and 240 scanning lines are sequentially divided from the upper scanning line, so that one image is displayed on the screen 8.

Furthermore, the above-mentioned operations are repeated for each field of the input video signal, and a moving image is displayed on the screen 8 in the same manner as in a normal television receiver.

The basic clock required to control this image display device is
It is supplied from a pulse generation circuit 39 shown in FIG. 9, and its timing is controlled by a horizontal synchronizing signal H1 and a vertical synchronizing signal V.

Problems to be Solved by the Invention The image display device as described above has a structure in which a plurality of image display units each having a line cathode are connected in the vertical direction, so that mechanical assembly errors cannot be caused for each image display unit. Therefore, the relationship between the deflection voltage and the amount of deflection of the electron beam differs for each image display unit.

For the above reasons, the image display element as described above is used as 17.
- In order to obtain a highly uniform LANUTA (a LANUTA in which the joints of each image display unit are not noticeable as a peculiar pattern), it is necessary to accurately adjust the vertical deflection voltage of each electron beam. Conventionally, each shimiko beam pot was adjusted by visual inspection, which required adjustment time of about one hour per unit.

The present invention solves the above problems and provides an adjustment device that can automatically and accurately adjust the vertical deflection voltage in such an image display device.

A second aspect of the invention is to provide an adjusting device that can automatically and accurately adjust the horizontal deflection voltage at the same time as adjusting the vertical deflection voltage.

Means for Solving the Problems In order to solve the above problems, the image display device of the present invention includes:
On the screen, carbon black or a non-luminescent material is applied horizontally in the form of stripes or broken lines at a scanning line pitch, and furthermore, a light receiving element, an amplifier, and The A/D converter 9 includes a controller for controlling the deflection waveform of the image display device, and a computer.

Further, the adjustment device for the image display device of the present invention coats phosphors of three colors R, G, and B in a delta shape on the screen of the image display element, and further includes the adjustment device for the vertical and horizontal deflection voltage waveforms of the image display device. A light receiving element with a color filter, an amplifier, and an A/D converter.

A controller that controls the deflection waveform of the image display device.

and a computer.

Function First, the function of the first invention will be explained. The output of the light receiving element and the vertical deflection voltage at that time are stored for all possible values of the vertical deflection voltage. At this time, the output of the light-receiving element becomes polar /J when the electron beam passes through a horizontal nutripe-shaped or broken line-shaped non-light-emitting area provided on the screen of the image display element, and vice versa. When the electron beam passes between the parts, it becomes maximum.

Next, by determining the vertical deflection voltage when the output of the light receiving element reaches its maximum, it is possible to know the vertical deflection voltage required to display the scanning line correctly.

By performing the above operation on the entire screen, an accurate vertical deflection waveform can be created.

Next, the operation of the second invention will be explained. Fixing the vertical deflection voltage and for all possible values of the horizontal deflection voltage,
The output of the light-receiving element with a color filter and the horizontal deflection voltage and vertical deflection voltage at that time are stored. Next, after changing the vertical deflection voltage, repeat the above operation for all possible values of the vertical deflection voltage to calculate the relationship between the vertical deflection voltage and horizontal deflection voltage vs. brightness. You can know. At this time, for example, if the filter attached to the light-receiving element is blue, by determining the vertical and horizontal deflection voltages when the output of the light-receiving element reaches its maximum, the deflection voltage to accurately irradiate the blue phosphor can be determined. You can know.

By performing this operation on the entire screen, accurate vertical and horizontal deflection voltage waveforms can be created.

Example An embodiment of the first invention will be described with reference to the drawings.

FIG. 1 is an enlarged view of the screen of the image display element used in the present invention. In the figure, phosphors 50R and 50G emit red, green, and blue light, respectively.

50B, carbon black 51 is applied in a stripe pattern in the vertical direction, and carbon blank 52 is applied in a dashed line pattern in the horizontal direction with scanning line pinch. FIG. 2 shows a block diagram of an adjustment device for an image display device used in the present invention. Image display device 60 and light receiving element 6 to be adjusted
1, an amplifier 62, an A/D converter 63, a memory 64, a controller 65, and a CPU 66.

For explanation, the vertical deflection voltage of the image display device 60 is . ~ ■ 256 types of voltages of 2.5 are applied.

First, the controller 65 sets the vertical deflection voltage of the image display device 6o to V. Fixed to. In this state, the image display device is operated and the output of the light receiving element 61 for each line cathode is stored in the memory 64. Next, fix the vertical deflection voltage to 1 and repeat the same operation. The vertical deflection voltage for the above operation is 2.
Repeat until it reaches 5.

Next, a method for creating a vertical deflection waveform will be explained with reference to FIG. If we fix one line shade (42) and graph the relationship between the direct deflection voltage and the output of the light receiving element, we get the function f as shown in Figure 3.
L is obtained. At this time, when a vertical deflection voltage that gives a minimum value to the function fL is applied, the landing position of the electron beam is on the horizontal broken-line non-light-emitting part provided on the screen, and conversely, when a vertical deflection voltage that gives a minimum value to the function When the given vertical deflection voltage is applied, the landing position of the electron beam is between the horizontal broken-line non-light-emitting portions provided on the screen. Therefore, by creating a stepwise vertical deflection waveform using the vertical one-tub direction' turtle pressure that gives the maximum value to the function fL, a vertical deflection waveform for the corresponding line cathode can be obtained.

An accurate vertical deflection voltage waveform can be created by performing the above operations for all wire cathodes.

Another embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is an enlarged view of the screen of the image display element used in the present invention. In the figure, the phosphor soR, 80G emits red, green, and blue, respectively.

It consists of 80B. FIG. 5 is a block diagram of an image display device used in the present invention. Image display device 90 to be adjusted, light receiving element 91R with red, green, and blue filters
, 91G, 91B, an amplifier 92, an A/D converter 93, a memory 94, a controller 95, and a CPU 96.

For purposes of explanation, the vertical and horizontal deflection voltages of the image display device 90 are respectively ■. ~■2.5 and H8~H2,5-2
It is assumed that 56 types of voltages are applied in one cycle.

First, the controller 95 sets the vertical deflection voltage of the image display device 9Q to ■. , fix the horizontal deflection voltage to H8. The image display device is operated in this state, and the outputs of the light receiving elements 91R, 91G, and 91B for each line cathode are stored in the memory 94. Next, while keeping the vertical deflection voltage fixed, the horizontal deflection voltage is changed to Hl and the same operation is repeated. The above operation is repeated until the horizontal deflection voltage reaches H2.5. Further, the above operation is performed when the vertical deflection voltage is set to v1 to v25. About 9
Execute the return.

Next, a method for creating vertical deflection voltage waveforms and horizontal deflection voltage waveforms will be explained with reference to FIG. Here, if one line cathode is fixed, the vertical and horizontal deflection voltages become independent variables, and the respective light receiving elements 91R and 91G.

Three two-variable functions fR9 with the output of 91B as the dependent variable
fG and fB are obtained. One of these, fB, is shown in FIG. At this time, when the vertical and horizontal deflection voltages that give the maximum value to the function fB are applied, the landing position of the electron beam is exactly on the blue phosphor. Similarly, the vertical and horizontal deflection voltages for accurately irradiating red and green phosphors can be determined using the function fR9fG. Therefore, the functions fR, fG.

, +H to create a stepped vertical deflection waveform and a horizontal deflection waveform, vertical and horizontal deflection waveforms for the corresponding line cathode are obtained. By performing the above operation for all line cathodes, accurate vertical and horizontal deflection waveforms can be created.

Effects of the Invention As described above, according to the present invention, a deflection waveform is automatically created so that each electron beam spot is located between horizontal stripes or dashed carbon blacks or at the center of each phosphor. The carbon black in the form of horizontal stripes or broken lines or each phosphor itself is applied evenly in the vertical direction by pinching the scanning lines, so that scanning lines are drawn at equal intervals on the screen of the above-mentioned imaging device. , it is possible to automatically obtain a raster with good uniformity.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of the screen surface of the image display element used in the image display device of the present invention, FIG. 2 is a conceptual diagram of the system of the adjustment device of the image display device of the present invention, and FIG. 3 is an explanatory diagram of the same operation. Fig. 4 is an enlarged view of the screen surface of the image display element used in the adjustment device of the present invention, Fig. 5 is a conceptual diagram of the system, Fig. 6 is an explanatory diagram of the same operation, and Fig. 7 is the image display device of the present invention. 8 is an enlarged view of a conventional phosphor screen, FIG. 9 is a block diagram of a drive circuit of a conventional image display device, and FIG. 10 is a waveform diagram of the drive circuit. 60R, soG, 50B, 80R, 80G. 80B... Fluorescent substance, 51.52... Carbon black, 61,91... Light receiving element, 6
2.92...Amplifier, 63, 93...
A/D converter, 64, 94...memory, 65.
96... Controller, 66°96...
・CPU. Name of agent: Patent attorney Shigetaka Awano and one other person
5 1, l1l (1, - Mizuhaya Rin Encyclopedia Pressure

Claims (2)

[Claims] (1) The screen on the image screen (hereinafter simply referred to as screen) coated with phosphor that emits light when irradiated with an electron beam is vertically divided into multiple sections, and a screen is provided for each vertical section. The electron beam generated from the line cathode is deflected in the vertical direction and then irradiated with the phosphor coated on the screen, forming an image with many beam spots formed on the screen. In the image display device, phosphors of the three primary colors R, G, and B are coated in stripes in the vertical direction on the screen, and carbon black or non-luminescent material is applied in stripes or broken lines in the horizontal direction. An image display device using image display elements coated with pitch. (2) The screen on the screen is vertically divided into multiple sections, and the electron beam generated from the line cathode provided in each vertical section is applied onto the screen after being deflected in the vertical direction. In an image display element where an image is formed by many beam spots formed on a screen by irradiating the screen with phosphors, phosphors of three colors R, G, and B are applied in a delta shape on the screen. and a light receiving element that detects the amount of light emitted from at least one of R, G, and B colors as an adjustment device that adjusts vertical and horizontal deflection voltage waveforms of an image display device using the image display device. An adjustment device for an image display device, comprising means for calculating vertical and horizontal deflection waveforms based on the output of a light receiving element and automatically adjusting the vertical and horizontal deflection voltages.