KR940007503B1 - Image display device for flat crt - Google Patents

Abstract

The display circuit includes a simple driving circuit that comprises a lengthwise electrodes placed in parallel on the front plate, a widthwise electrodes placed in parallel and crossed to the lengthwise electrodes in right angle on the back plate, the fluorescent layer deposited on the lengthwise electrodes, and the insulation plate with holes at the cross point of the electrodes and placed between the widthwise electrodes and the fluorescent layer.

Description

Video display device of flat panel CRT

1 is a structure diagram of a net electrode of a flat panel display element and a position diagram of a conventional electrode and a fluorescent surface.

2 is an image data display waveform diagram of a conventional flat panel display element.

3 is a cross-sectional view of a flat plate CRT according to the present invention.

4 is a front view of a low voltage light emitting phosphor distribution according to the present invention;

5 is a distribution diagram of a ROW electrode of the present invention.

6 is a distribution diagram of a COLUMN electrode of the present invention.

7 is a front view of a hole (HOLE) structural plate of the present invention.

8 is a driving circuit of a COLUMN electrode of the present invention.

9 is a detailed circuit diagram of the color control unit of FIG.

10 is a waveform diagram of FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device, and more particularly, to a display device for displaying an image in a flat panel CRT and a driving circuit thereof.

FIG. 1 is a view illustrating a positional relationship between an electrode structure having a net structure of a flat plate CRT and an electrode and a fluorescent surface. In order to express a color, three colors per horizontal pixel form a pair and a mattress inside a fluorescent surface vertically coated. It has a form of electrode structure and stores video signals in field units, and drives one color signal into three sections to sequentially drive the RG B color signal. The horizontally arranged electrodes constitute one set, and each set includes the number of pixels on the screen in each direction. The electrode having the above structure is controlled by a mattress addressing method. When the corresponding transverse electrode is enabled, the electron beam is accelerated and then blocked or progressed toward the fluorescent surface according to the voltage applied to the vertical electrode. At this time, the vertical electrode is located inside the fluorescent surface, and the amount of electron beam is determined by the potential applied to the vertical electrode, and the degree of deflection of the electron beam is determined by the potential difference between the two vertical electrodes. Is displayed. Even in the case of monochromatic black and white, the vertical electrode is located inside the fluorescent surface, and the electron beam of the selected line is first accelerated by the voltage applied to the horizontal electrode, and the amount and deflection degree of the electron beam are determined by the potential applied to the vertical electrode. Will be represented.

FIG. 2 is a view of conventionally displaying a color image in a waveform of an image signal, storing an image signal of one field, dividing the period of one field into three sections, and sequentially driving the color signals of RG B to each electrode. Will be applied to.

Therefore, in the related art, the degree of deflection becomes nonlinear, and the reproducibility of the image due to the deflection difference is deteriorated, and the driving circuit is complicated.

It is therefore an object of the present invention to provide a flat panel CRT image display device having a simple driving circuit and good image reproducibility.

In order to achieve the above object, the present invention is a flat plate CRT, the longitudinal electrode formed on the front plate and arranged in parallel with each other; Transverse electrodes formed on a back plate having a surface electron source and formed parallel to each other perpendicular to the vertical electrode; A phosphor formed on the vertical electrode corresponding to the vertical electrodes; When viewed from the front of the screen, the pixel to be displayed is provided with an insulating plate formed between the phosphor layer and the transverse electrodes and having a hole structure penetrating back and forth on the screen at the intersection of the vertical electrode and the transverse electrode. It is characterized by being driven by applying a voltage difference capable of electromagnetic acceleration to cross the longitudinal electrode and the transverse electrode.

Next will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view of an embodiment of the flat CRT according to the present invention for expressing multi-colors. The face plate is disposed on the front surface of the flat CRT, and a transparent vertical electrode composed of one set of three is arranged. On the back of the vertical electrode, three colors of low voltage emitters are alternately arranged, and the hole structure plate that controls the directivity of the electron beam is arranged in order, and the horizontal electrodes arranged horizontally when viewed in plan view. Firstly accelerated by the voltage applied to the electrode and the voltage applied to the vertical electrode to pass through the hole of the hole structure plate to emit the corresponding light emitting phosphor. That is, the conventional vertical electrode is located inside the fluorescent surface, but the vertical electrode in the present invention is located outside the fluorescent surface and made of a transparent material so that light emitted from the fluorescent surface passes through the entire face plate through the vertical electrode. In such a configuration, a mattress driving method in a practical sense is possible. In the case of expressing a single color or a black and white image, one vertical electrode is arranged in a pair in a pair, and the hole structure plate may be formed at each intersection of the horizontal electrode and the vertical electrode, and one per pixel may be formed. As may be formed serves to control the directivity of the electron beam.

4 shows a distribution of light emitting phosphors applied on a screen in expressing multiple colors, and three light emitting phosphors are arranged vertically on the back of each vertical electrode. In the case of a single color, the light emitting phosphors of one color are arranged vertically in a pair.

5 illustrates the structure of the transverse electrode. The transverse electrode has a hole through which the electron beam passes through the intersection with the vertical electrode, and the hole is formed to coincide with the hole of the hole structure plate.

FIG. 6 shows the distribution of the vertical electrodes in the case of expressing multiple colors and is arranged vertically in groups of three. Monochrome, which is a single color, is arranged vertically in a pair. 7 shows a structure of a hole structure plate positioned between a light emitting phosphor and a transverse electrode, in which an electron beam accelerated through a transverse electrode to a vertical electrode is installed to increase directivity, and has one hole per pixel or the vertical electrode. One hole may be formed at each intersection point of the transverse electrode. In the flat plate CRT formed as the above structure, the driving device includes a horizontal electrode driving part and a vertical electrode driving part. The driving method may include driving one pixel at a time and one line at a time. Each case of the driving method for expressing multiple colors will be described next. The first method is to drive one line at a time. The image data of one horizontal scanning period is stored, and the horizontal electrode of the corresponding data line is enabled according to the image data of each pixel in the next horizontal scanning period. In addition, the signals according to the image data of three colors are simultaneously applied to each of the vertical electrodes constituted by a pair of three. In other words, the data for one pixel is applied to the corresponding vertical electrode, respectively. In the second method, another method of driving one line at a time is to store image data of a 1-horizontal scanning period, and then to enable horizontal electrodes according to the image data of each pixel in the next horizontal scanning period, and then horizontally. The syringe section is divided into three subdivisions, and only data for one color signal is applied to each vertical electrode corresponding to the color for each subdivision.

In the third method, only one pixel of image data is driven at a time. The enable signal is applied to the corresponding horizontal electrode, and one of the three vertical electrodes has a potential corresponding to each signal amount. Each is applied to display a multi-color screen. A specific circuit of the vertical electrode driver according to the second method among the three methods will be described next.

8 illustrates an embodiment of a circuit for driving a vertical electrode, and includes a shift register, a latch means, a color control unit, a level shifter, and the like, and an image signal divided into three color signals indicates the number of pixels corresponding to a horizontal scanning period. When n bits are input, they are respectively input to n bit shift registers. Each shift register shifts the input data in synchronization with the data clock, outputs it to an output terminal of n bits, and applies it to the three latch means. Each latch means latches a signal applied to an input terminal in a region where the horizontal synchronization signal is at a "low" level, and outputs a signal applied to each output enable terminal OE when it is at a "high" level. do. The level shifter inputs the input of each latching means, interleaves it, and applies it to each vertical electrode. The color control part outputs three signals which are sequentially enabled during the 1-horizontal scanning period, and outputs the output enable terminal of each latching means. Its role is to authorize.

9 and 10 show an embodiment of the color control unit and a waveform diagram of each unit. The color control unit includes two JK flip-flops and three NAND gates. A horizontal synchronous signal is applied to each NAND gate, and a horizontal synchronous signal is applied. In the "high" level, the signal ECLK having three pulses is applied to each JK flip-flop terminal, the supply potential is applied to the K terminal of each JK flip-flop, and the positive output (Q) of the 1-JK flip-flop is applied. ) Is applied to the J input terminal of the 2-JK flip-flop and the 2-NAND gate, and the negative output Is applied to the first and third NAND gates, and the positive output (Q) of the 2-JK flip-flop is applied to the 3-NAND gate and is a negative output. Is applied to the J input terminal of the 1-JK flip-flop and the first and second NAND gates so that each of the NAND gates sequentially outputs a "high" level signal during the 1-horizontal scanning period.

As described above, in the present invention, the vertical electrode is transparently formed on the front surface of the fluorescent surface and has a hole structure plate for enhancing the directivity of the electron beam between the horizontal electrode and the vertical electrode, so that the direct mattress addressing method of the electron beam is easy and the driving circuit thereof is Compared to the simple and deflecting method, there is an advantage of preventing color reproduction or other colors from being reproduced due to the deflection of the electron beam.

Claims (10)

A flat plate CRT comprising: longitudinal electrodes formed on the front plate and arranged in parallel with each other; Transverse electrodes formed on a back plate having a surface electron source and formed parallel to each other perpendicular to the vertical electrode; A phosphor layer formed on the vertical electrode corresponding to the vertical electrodes; When viewed from the front of the screen having a hole structure penetrating the front and back on the screen at the intersection of the vertical electrode and the transverse electrode is provided with an insulating plate formed between the phosphor layer and the transverse electrodes, the pixel to display A flat panel CRT image display device which is driven by applying a voltage difference that can be electromagnetically accelerated to cross vertical and horizontal electrodes. 2. The vertical electrode of claim 1, wherein the three electrodes corresponding to the three primary colors form a pair and are vertically arranged by the number of pixels on the horizontal scan line, and the phosphor has three primary colors between the vertical electrode and the horizontal electrode. A flat panel CRT image display device further comprising: an electrode driver for vertically applying the number of pixels on a horizontal scan line to form an image to express an image in multiple colors. . The method according to claim 2, wherein the electrode driver stores the image signal of the 1-horizontal scanning period converted into color signals, divides the 1-horizontal scanning period into three sections, and sequentially drives three color signals during each section. A vertical electrode driver for applying to the vertical electrode of the electrode; And a horizontal electrode driver for applying a signal, which is sequentially enabled from the vertical synchronization signal by one horizontal scan period, to the horizontal electrode. 4. The apparatus of claim 3, wherein the vertical electrode driver comprises: storage means for storing an image signal of a 1-horizontal scanning period converted into a color signal; A color control unit for dividing the 1-horizontal scanning period into three sections and outputting three signals which are sequentially enabled, and the stored signals of the storage unit are enabled sequentially according to the type of color signal. Flat panel CRT image display device, characterized in that applied to the electrode. 5. The apparatus according to claim 4, wherein the storage means comprises: three shift registers for inputting video signals converted into three color signals, respectively, and shifting and outputting them in synchronization with a clock signal; Latching the output of the shift registers in a horizontal synchronizing signal and having three latch means for output terminals being applied to the vertical electrodes, respectively, and outputs of the color control units being applied to the output enable terminals of the three latch means, respectively. A flat panel CRT image display device. 5. The color control unit of claim 4, wherein the color control unit includes a first-JK flip-flop, a second-JK flip-flop, a first-NAND gate, a second-NAND gate, and a third-NAND gate, and a clock of each JK flip-flop. The terminal applies a signal representing three pulse waveforms during the horizontal scanning period, the supply potential is applied to the K terminal, and the 2-JK flip flop is applied to the J terminal of the 1-JK flip-flop. Apply the signal of the output terminal and apply the signal of the Q output terminal of the 1st -JK flip-flop to the J terminal of the 2-JK flip-flop, and the 1-NAND gate is the horizontal synchronization signal and the 1-JK flip-flop. Signal of output terminal and 2-JK flip flop Outputs the first index enable signal by multiplying the signal of the output terminal, and the 2-NAND gate is the horizontal synchronization signal and the signal of the Q output terminal of the 1-JK flip-flop and the 2-JK flip-flop. The second index enable signal is output by ANDing the signal of the output terminal, and the 3-NAND gate is connected to the horizontal sync signal and the 1-JK flip-flop. And a third index enable signal is output by ANDing the signal of the output terminal and the signal of the Q terminal of the 2-JK flip-flop. The flat panel CRT image display according to claim 1, wherein the horizontal electrode is horizontally applied at the position of the hole of the insulating plate and has the same hole structure so that the electron beam is accelerated by the voltage applied to the horizontal electrode. Device. The flat panel CRT image display apparatus according to claim 1, wherein the insulating plate has a hole structure at a portion where the horizontal electrode and the vertical electrode cross each other. The method of claim 2, wherein the electrode driver is delayed by 1-horizontal scanning period from the vertical synchronization signal and sequentially enabled signals for each horizontal electrode to drive the image data one line at a time. A transverse electrode driving unit to be applied; A flat panel CRT image display device comprising a vertical electrode driver for storing image data of a 1-horizontal scanning period and then simultaneously applying signals for driving each of the three vertical electrodes in the next horizontal scanning period. . The method according to claim 2, wherein the electrode driver enables a corresponding horizontal electrode to drive data one pixel at a time, and a signal amount according to various image data to one corresponding vertical electrode among three vertical electrodes. Flat CRT image display device, characterized in that for applying each.