JPS59141155A - Picture display device - Google Patents

Abstract

PURPOSE:To display distortionless and bright pictures by providing multiple column-like rear electrodes in the direction crossing with linear thermal cathodes and providing phosphors luminescing when hit by an electron beam on multiple line-like anode electrodes arranged in front at a right angle to the direction of the rear electrodes. CONSTITUTION:A front wall 1 is constituted with a thick glass material, etc., and column-like anode electrodes 8 extending laterally are formed with a metal plate, a metal film, or a transparent conductor and each electrode is electrically insulated with an insulator 9. The insulator 9 is formed with a material having a light absorbing effect. Island-like phosphors 11r, 12b, 11g, 12r, 11b, 12g are coated on the electrode 8; 11r, 12r use a red phosphor, 11b, 12b use a blue phosphor, 11g, 12g use a green phosphor, and the uncoated portions 13 use a light absorber. One or multiple linear thermal cathodes 2 are provided. A rear wall 3 is constituted with a transparent insulator, such as a glass material, etc., and column-like rear electrodes 33r, 34b, 33g, 34r, 33b, 34g are provided corresponding to the phosphors 11r, 12b, 11g, 12r, 11b, 12g.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention controls electrons emitted from one or more linear hot cathodes in a vacuum vessel using a matrix of columnar back electrodes and row anode electrodes. In particular, it relates to an image display device for displaying υ characters, images, etc. by emitting light.

Conventional Structure and Problems Conventionally, monochrome cathode ray tubes or color cathode ray tubes such as shadow mask type are used as image display devices. These cathode ray tubes, or video tubes, have the disadvantage that the distance from the electron source to the display section is long because the electron beams emitted from the electron source are focused and deflected.

In order to compensate for the above drawbacks, various image display devices have been devised in which the depth is narrowed by controlling the electron beam in a matrix manner without deflecting it. For example, JP-A-56-7
Typical display devices are disclosed in Japanese Patent Application Laid-open No. 9845 and Japanese Patent Application Laid-Open No. 56-99955. Japanese Unexamined Patent Publication 1986-7
The display device disclosed in No. 9845 had two grid-like electrode plates and i-vertical and horizontal deflection plates between the hot cathode and the display plate, and had a complicated electrode configuration. Furthermore, since the grid-like electrode plates have a positive potential with respect to the electron source, there is a drawback that electrons are captured to some extent by these electrodes, resulting in poor electron beam transmittance. On the other hand, in the case of the display device disclosed in JP-A-56-99955, a grid electrode is inserted between the cathode and the anode (segment electrode), and this electrode reduces the transmittance of the electron beam and modulates the modulation by about 100V. The drawback was that it was carried out at a high voltage.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a flat panel image display device that has a simple structure, a narrow depth, and can obtain bright images without image distortion. .

Structure of the Invention The present invention controls the amount of electrons emitted from the linear thermionic electron source in the horizontal direction by means of a columnar back electrode corresponding to the number of horizontal pixels on the back surface of the linear thermionic electron source. The vertical direction is controlled by switching the voltage applied to the row anode electrodes which are located in front of the electrode and extend horizontally in a direction orthogonal to the row back electrodes, and the phosphors provided on the anode electrodes are selectively steered. This is a flat panel image display device that displays black and white or color images.

Description of examples An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of essential components of the present invention.

Reference numeral 1 denotes a front wall, which is made of an insulator such as a thick glass material. Reference numeral 8 denotes a horizontally extending anode electrode, which is formed of a metal plate or a transparent conductor, and the electrodes are electrically insulated from each other by an insulator 9. The insulator 9 is made of an insulating material that has a light absorption effect. Each anode electrode 8 is extended alternately from the left and right sides of the front wall.

11r, 12b, 11g, 12r, 11b.

12g is an island-like phosphor coated on the anode electrode, and when displaying a color image, 11r and 12
r is red, 11g, 12g is green, 11b.

12b uses a blue phosphor, and in the case of a black and white display device, 11r, 12b, 11g, 12. ,r,1
1b.

12g is the same phosphor divided into rows.

The portion 13 on which no phosphor is coated is a light absorber for increasing the contrast of the displayed image.

2 is one or more linear hot cathodes, with a diameter of several tens.
An oxide electron emitting material is attached to a micron tungsten wire. The number of linear hot cathodes 2 is determined by the distance between the front wall 1 and the linear hot cathodes 2, the height of the anode electrode group, and the width of the anode electrode 80. For example, the distance between the front wall 1 and the linear hot cathode 2 is 30 mm, and the height of the anode electrode group is 20 mm.
If the width of each anode electrode 8 is 1 mm, approximately seven linear hot cathodes 2 are required.

3 is a rear wall, which is made of a transparent insulator such as a thick glass material. 33r, 34b, 33g34r, 33b
, 34g are row-shaped back electrodes separated from each other in the vertical direction, the metal film pieces are made of a transparent conductor, and the phosphor 11r is
, 12b, 11g.

They are located in one-to-one correspondence with 12r, 11b, and 12g.

The positional relationship and dimensions of each part are outlined in Figures 2 and 3.
This will be explained with the help of a diagram. In FIGS. 2 and 3, the same parts as in FIG. 1 are designated by the same reference numerals, and the explanation thereof will be omitted. Second
The figure shows a cross-sectional side view of the configuration of FIG. 1, where 23 is an electron beam. FIG. 3 is a cross-sectional plan view of FIG. 1. 21 is a holder for the linear hot cathode 2, and 22 is a leaf spring for preventing the linear hot cathode 2 from slackening. 23 is an electron beam. Distance LR between linear hot cathode 2 and back electrode 33.34
is approximately 1 mm No. osmm, and is set to be approximately the same as or less than the width W of the back electrode 33°34.

The width W of the rear surface molds 4if 33, 34 is related to the horizontal resolution, but is approximately 1 um to 0.05 mm, and the spacing S between the rear electrodes 33 is equal to or narrower than that of the rear electrodes 33, 34. The width of the phosphor 11.12 is set to be equal to or narrower than the width W of the back electrode 33.34. The width A of the anode electrode 8 is related to the vertical resolution, but is set to about 1 mW to osmm.

FIG. 4 shows an example of the basic wiring of the image display device according to the present invention. Components in the figure that are the same as those in FIG. 14 is a synchronization separation circuit that separates the composite video signal into a video signal, a horizontal synchronization signal, and a vertical synchronization signal. 1
6 is a video demodulation circuit, for example, from NTSC signal to red,
Creates green and blue video color signals. 19. 20 is a vertical selection circuit that applies a voltage of several tens of volts to several tens of ov to the anode electrode 8.
, and turn it on. At that time, the other anode electrodes are turned off by applying a voltage of a plus number V to the other anode electrodes, and in the first odd field, the selection of the vertical selection circuit 19 is sequentially switched, and all outputs of the vertical selection circuit 20 are turned off. .

In the next even field, the operations of the vertical selection circuits 19 and 20 are reversed, and all outputs of the vertical selection circuit 19 are turned off.

The vertical selection circuit 2o performs selection switching.

The above operation becomes interlaced scanning. 17 is a clock pulse generation circuit synchronized with a vertical synchronization signal, and 18 is an anode voltage generator. Reference numeral 16 denotes a pulse generator for generating various pulses for image processing based on the horizontal synchronizing signal. 24 is an A/D converter that converts a blue analog video signal into a digital video signal, and two sets of 1H line memories.26 is an A/D converter for the edge and two sets of 1H line memories.26 is an A/D converter for red. D Konno Kuichita and 2
This is a set of 1H line memories. The digital signals from the respective A/D converters 24, 25, and 26 are written alternately every 1H into two sets of 1H line memories, and are divided into two systems, odd and even, and read out every 1/2H line. Modulation and switching circuits 27, 28, 29,
Enter 30, 31°32. 27 is a circuit for odd number electrode blue, 2
8 is a circuit for the same edge, and 29 is a circuit for the same edge. Further, 30°31.32 is a circuit for blue, green, and red with even number electrodes. 4
0 is an odd-numbered electrode red drive circuit that generates a modulation voltage applied to the back electrode 33r. Reference numeral 41 denotes a blue circuit, 42 a line circuit, which generates modulation voltages to the back electrodes 33b and 33g, respectively. 043, an even electrode edge drive circuit, generates a modulation voltage to be applied to the back electrode 34g. 44 is a circuit for red, and 46 is a circuit for blue, which generates a modulation voltage to the back electrodes 34r and 34b. 046 is a circuit that corrects, for example, the potential gradient at both ends of a long linear hot cathode in the horizontal direction of the screen. , synchronized with the horizontal deflection 0 Next, the operation of the O linear hot cathode 2 will be explained.
The oxide cathode generates hot electrons. The back electrodes 33, 34 are uniformly maintained at, for example, Ov by the brightness adjustment power supply 5, and one anode electrode is maintained at, for example, 20
When applying 0V and setting the other anode electrode to Ov, +200
Only the phosphor of the anode electrode to which V is applied emits light. If the voltage applied to the anode electrode 8 is changed sequentially from the topmost anode electrode every horizontal scanning time, and the other anode electrodes are set to Ov, the horizontal bright line moves from top to bottom, and a raster is generated. On the other hand, scanning in the horizontal direction is performed as follows. 34g, 34r,
34bKOFF signal, for example, if -10V is input, the odd-numbered back electrode 33. The electron beams 23r, 23b, and 23g corresponding to portions r, 33b, and 33g are the fluorescent surface 11r.

11b and 11g, only these emit light, and the other phosphors do not emit light. This situation is shown in FIG. 3. The brightness modulation is performed by the amplitude of the pulse, which is equal to the width of the pulse applied to the back electrodes 33 and 34.

Since the distance between the linear hot cathode 2 and the back electrode 33.34 is very narrow, the electrons emitted from the linear hot cathode 2 are transferred to the back electrode 33.34.
34 [Controlled by the applied voltage. Also, if a negative voltage is applied to either the odd-numbered electrodes 33 or the even-numbered electrodes 34 of the back electrodes 33 and 34, O
A lateral focusing effect occurs on the electrons emitted from the linear hot cathode corresponding to the electrode v, and crosstalk can be prevented.

Next, when a pulse voltage of Ov is applied to the even-numbered back electrodes 34 and a pulse voltage of 110 cm is applied to the odd-numbered back electrodes 33, the even-numbered phosphors 12 emit light, and the odd-numbered phosphors 12 emit light. 11 does not emit light. If the same operation is repeated every half period of one horizontal scanning time, the number of pixels corresponding to the number of back electrodes can be obtained in the horizontal direction.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention includes a back wall having a plurality of column-shaped back electrodes separated from each other, row-shaped anode electrodes formed facing the column-shaped back electrodes, and a plurality of row-shaped anode electrodes provided on the anode electrodes. a front wall having a phosphor, and a plurality of linear hot cathodes arranged in a direction perpendicular to the direction of the column electrodes on the back wall in a back electrode strip between both walls. This image display device has a simple structure, a narrow depth, no image distortion, and can provide bright images with extremely high electron transmittance.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an image display device according to an embodiment of the present invention, FIGS. 2 and 3 are sectional side views and sectional views of main parts of the image display device according to the present invention, and FIG. 0 is a wiring diagram including a drive circuit system of the image display device according to the invention; 1...Front wall; 2... Linear hot cathode; 3.
... Rear wall, 8 ... Anode electrode, 9
・・・・・・Insulator, 11゜12・・・−・・Fluorescent material,
13... Light absorber, 33.34... Back electrode. Name of agent: Patent attorney Toshio Nakao and 1 other person @2
1Xl! K Figure 3

Claims (1)

[Claims] 0) A plurality of linear hot cathodes lying on the same plane, and a plurality of rows disposed behind the linear hot cathode and extending in a direction intersecting the linear hot cathode. A light-emitting display board comprising a back electrode and a plurality of row-shaped anode electrodes arranged in front of the linear hot cathode and arranged on a plurality of row-shaped anode electrodes, each of which is provided with a phosphor that emits light by collision with an electron beam. An image display device comprising: (2) The image display device according to claim 1, wherein the distance between the linear hot cathode and the columnar back electrode is smaller than or equal to the width of each electrode of the columnar back electrode. (3) The image display device according to claim 1, wherein the width of each electrode of the row-shaped back electrodes is wider than the interval between adjacent back electrodes. (4) The image display device according to claim 1, wherein each electrode of the row anode electrodes is led out alternately from the left and right sides of the front wall. (6) The interval between adjacent anode electrodes of the row anode electrodes is narrower than the width of each anode electrode as claimed in claim 1.
The image display device described in Section 1. (6) The image display device according to claim 1, wherein a light absorber is formed between the rows of each anode electrode. (7) Arrays of red, green, and blue island-shaped phosphors corresponding one-to-one with the back electrode are arranged alternately on the anode electrode, and each row of three-color phosphors The image display device according to claim 1, wherein the color video signal is applied to the corresponding back electrode. (8) The image display device according to claim 1, wherein a light absorber is formed between each row of phosphors.