JPH0367446A - Flat type image display device and manufacture thereof - Google Patents

Abstract

PURPOSE:To reduce power consumption by dividing base electrodes into (n) in the screen vertical direction, independently applying signals to them, increasing the duty of the time when individual cathodes are operated to (n) times, and making the image signal voltage applied to the base electrodes small in amplitude. CONSTITUTION:Terminal leads 11a made of a conducting material such as metal are formed on the surface of an insulated substrate 10 made of glass or the like by deposition at the preset pitch in the horizontal direction on about a half of the vertical distance of a display region. An insulator 12a such as frit glass with the preset thickness is formed on terminal leads 11a by screen printing or the like. Terminal leads 11b are formed on 1/2 of leads 11a like terminal leads 11a. An insulator 12b is formed at the preset thickness on leads 11b, and through holes 41 are provided at preset positions on leads 11b. A conducting material is buried in holes 41, base electrodes 13 are formed on them, and terminal leads 11a and 11b are connected. Cold cathodes 14 are provided on electrodes 13. Base electrodes 18 are divided into (n) in the screen vertical direction, the duty of the time when individual cathodes are operated is increased to (n) times, and the image signal voltage is made small in amplitude.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat panel image display device used in color television receivers, computer terminal displays, etc., and a method for manufacturing the same.

BACKGROUND ART Conventionally, flat panel displays using field eminotar type cold cathodes have been developed and reported. For example, C.N. Spind et al., IEEE Electron Devices, Vol. 1, Vol.
EEE Trans, ED, Vol, 36. A
I, 1989), and Information Display by I Pro Day, pages 17-19,
1989 (1, Brodie.

Information Display, 17.1
989) is known.

The structure will be briefly explained below with reference to FIGS. 5 and 6. FIG. 5(a) is an overall structural diagram of a flat panel display, and fbl is a cross section of one pixel thereof. Si substrate 101
A pace electrode 102 is formed in a stripe shape on top, and a gate electrode 104 is perpendicular to this through an oxide insulating film 109.
A cold cathode 103 having the structure shown in FIG. 6 is formed at the intersection of the two. There are three gate electrodes 104 in the l picture element, and red (R) and green (G) gate electrodes are located opposite to these.
), a face plate 107 on which a blue (B) phosphor stripe 105 is formed is disposed. In addition, phosphor 1
05 is formed on a transparent conductive film (■To) 106 formed on the inner surface of the face plate. Gate electrode 1
04 and the face plate 107 are kept at a predetermined distance by a support 108. It goes without saying that the Si substrate 101 (face plate) 107 forms part of the vacuum envelope.

When displaying television images, the pace electrode 102
A line selection pulse voltage of one horizontal scanning period is sequentially applied to perform vertical scanning. On the other hand, when an image color signal is applied to the gate electrode 104, an electron beam is emitted from the cold cathode located at the intersection of the image electrodes to which the signal voltage is applied, which causes the phosphor 105 to emit light and display an image. .

The cold cathode 103 has a cone shape as shown in FIG. 6, and a gate electrode 104 is provided near its tip.

Problems to be Solved by the Invention However, in conventional flat panel image display devices, the base electrode is connected from the top to the bottom of the screen, and the electron beam emission time from the cold cathode at the intersection with the gate electrode is longer than that of the standard television system. In the case of l horizontal scanning time during one frame, the duty is 1/525. Therefore, in order to display a bright image, it is necessary to emit a large amount of electron beams from each cold cathode, which shortens the life of the cold cathode and at the same time increases the amplitude of the image color signal applied to the pace electrode. There was a problem that power consumption increased due to the increase in the amount of power.

SUMMARY OF THE INVENTION In view of the problems of the conventional devices described above, it is an object of the present invention to provide a flat panel image display device that can improve the driving efficiency of each cold cathode.

Means for Solving the Problems In order to achieve the above object, the technical solution of the present invention is as follows:
The base electrode of a conventional flat panel image display device is divided into a plurality of parts in the vertical direction of the screen, each of which is led independently to the outside of the vacuum envelope, and a gate electrode is provided that intersects with the divided base electrode. Components in a predetermined positional relationship are connected by a common bus bar.

Function The present invention divides the base electrode into a plurality of parts (n) in the vertical direction of the screen and applies signals to these parts independently, thereby making it possible to set the duty of the time during which each cathode operates to n/525. With a beam amount of 1/n, it is possible to obtain a bright image equivalent to that of a conventional flat panel image display device.

In addition, the amplitude of the voltage applied to the base electrode becomes smaller,
This reduces power consumption.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram showing only the electron beam emitting section of a flat panel image device, that is, only the portion from the pace electrode to the gate electrode. Although other parts are omitted, they are basically the same as the conventional example. In FIG. 1, reference numeral 10 denotes an insulating substrate made of glass or the like, and on this insulating substrate 10 are provided an insulator 12 with openings for terminal leads 11a and llb and wiring, a pace electrode 13, and a cold cathode 14. are provided, and the pace electrode 13 and terminal leads lla and llb are connected through conductive substances 17, respectively. Furthermore, cold cathode 14
The divided gate electrodes 15 are arranged spaced apart from each other and connected to each other by a common bus bar.

In the above structure, the structure, manufacturing method, and driving method will be explained below. First, on the surface of an insulating substrate 10 made of glass or the like, a terminal lead Ila made of a conductive material such as metal is formed with a predetermined pinch in the horizontal direction (arrow in the figure), and extends to approximately the center of the insulating substrate 10. There is. This terminal lead Ila is covered with an insulating material 12 such as glass, leaving only the end portion and the connection portion with a pace electrode 13, which will be described later, and a terminal lead Ilb is formed thereon in the same manner as the terminal lead 11a. This terminal lead llb is shorter than the terminal lead lla.

The terminal lead llb is covered with an insulator 12, leaving only the end portion and the connection portion with the pace electrode 13. On the surface of the insulator 12, a pace electrode 13 having a predetermined vertical length (in this embodiment, the length is about 1/4 of the vertical distance of the image display screen) is connected to terminal leads lla, b.
It is formed horizontally with the same pitch as These pace electrodes 13 are electrically connected to the aforementioned terminal leads 11a, 2b through a conductive material 17. pace electrode 1
A cold cathode 14 similar to the conventional example is formed on top of the cold cathode 3 . The above structure is vertically symmetrical with respect to the vertical center.

Next, the gate electrode 15 formed thereon through an insulator (not shown) will be explained. In this embodiment, the pace electrode 13 is divided into four parts in the vertical direction, and assuming that the effective number of horizontal scanning lines of an NTSC standard TV image is 480, 120 gate electrodes 15 per one base electrode are divided equally in the vertical direction. They are arranged at a pitch and substantially perpendicular to the pace electrode 13. And from the top in the vertical direction 1.2.3.
4,...If you number it as 479.480, it becomes 1.
．． The 121st, 241st, and 361st gate electrodes are connected to the common bus line 16a.

Next, the 2,122,242,362nd gate electrodes are connected to the common bus line 16b. Similarly, n, (n
+ 120), (n + 240), (n +
The 360th) (n: positive integer equal to or less than 120) gate electrode is connected to the common bus line 16n.

A driving method for displaying a TV image on a flat panel image display device having the above electron beam emitting unit configuration will be described with reference to FIGS. 2 and 3. The synchronization signal 22 is input to a write timing pulse generator 25, and each control pulse signal for an A/D converter 24, a memory circuit 27 (described later), and a read timing pulse generator 26 is generated.

On the other hand, the input video signal 21 is converted to red (R) by the decoder 23.
, green (G), and blue (B), and then A/
The signal is sent to the D converter 27, sampled by a control pulse signal of a predetermined frequency from the write timing pulse generator 25, and converted into a digital signal of a predetermined number of bits. The A/D converted signal is sent to the frame memory circuit 27, and first the video signal between one field of the TV image is recorded. The signal written in the memory circuit 27 is read out by the control signal from the read timing pulse generator 26 when moving to the next field, and is sent to the drive circuit 28. First 1.61.121.181
The video signal of the th horizontal scanning period is transmitted to each drive circuit 2.
8a, 28b, 28c, and 28d at the same time, each drive circuit 28 converts and amplifies it into a pulse width modulation signal or an analog signal, and sends it to each terminal of the flat image display panel 30 (11 in FIG. 1). supplied to This supplied time is four horizontal scanning periods (hereinafter referred to as 4H).

On the other hand, based on the line selection control signal from the readout timing pulse generator 29, the line selection/drive circuit 29 sends a pulse signal of the voltage necessary for emitting an electron beam to the gate electrode for 4H. .241st and 361st are supplied to the connected common bus (Fig. 3, 32
a). After 4H elapses, the next horizontal scanning period (2, 62, 1
22, 181) are read out from the memory circuit 27 and supplied to each drive circuit 28. Also line selection/
From the drive circuit 29, a line selection pulse 32b obtained by shifting the phase of the aforementioned line selection pulse 32a by 4H is supplied to the common bus line to which the 3rd, 123rd, 243rd, and 363rd gate electrodes are connected. Thereafter, the same operation is repeated to display the image of the first field. When displaying an even field image, the video signal is supplied to the flat image display panel 30 in the same manner as the first field described above, but the line selection pulses are (m, m+120, m
+240. m + 360)th (m: 1
(a positive even number less than or equal to 20) gate electrodes are connected to a common bus bar. As a result of the above, one frame of TV image is displayed.

Next, an embodiment of a method for manufacturing the flat panel image display device of the present invention shown in FIG. 1 will be described with reference to FIG. 4. Note that FIG. 4 shows a part of FIG. 1 in the vertical direction. First, as shown in FIG. 4 (al), terminal leads 11a made of a conductive material such as metal are formed horizontally at a predetermined pitch on the surface of an insulating substrate 10 made of glass or the like by screen printing, vapor deposition, or the like. Its length is approximately 172 mm of the distance in the vertical direction of the image display area.Next, as shown in FIG. 1
118 surface. At this time, the terminal lead lla located outside the vacuum envelope is at least not covered with the insulator 12a. Furthermore, a through hole 14 of a predetermined size is provided in the insulator 12a above a predetermined position of the terminal lead 11a. Next, as shown in FIG. 4 (cl), the terminal lead 11b is formed in the same manner as the terminal lead lla. Its length is about 172 mm of the terminal lead lla. At this time, the through hole 41 is also filled with metal etc. It is also possible to screen-print a conductive material to establish electrical continuity with the terminal lead lla.Furthermore, at this stage, the pace electrode 13 shown by the dotted line may also be formed, and the process may proceed to the step shown in FIG. .Figure 4 (
dl is obtained by further forming an insulator 12b to a predetermined thickness on the terminal lead llb. At this time as well, a through hole 41 is provided at a predetermined position on the terminal lead Ilb and at the position of the through hole 41 so that the terminal lead Ilb outside the vacuum envelope is not covered with the insulator 12b. There is. A conductive material is embedded in these through holes 41 (not shown), and a metal that will become the pace electrode 13 is formed thereon to a predetermined size, and each terminal lead lla, l
lb (Fig. 4(e)). After completing the above steps, the cold cathode 14 is formed on the pace electrode 13 (for the first color). The method for manufacturing the cold cathode 14 may be the same as in the conventional example. As described above, a large number of terminal leads connected to the pace electrode can be formed by multilayer printing of terminal leads and insulators.

In the embodiment described above, the pace electrode is vertically divided into four parts, but it goes without saying that the invention is not limited to this. It goes without saying that in order to reduce the capacitance between the multi-layered terminal leads, in the embodiment of FIG. 1, the terminal leads 11b may be shifted by half a pitch in the horizontal direction.

Furthermore, it goes without saying that at least one through hole for establishing electrical conduction between the terminal lead and the pace electrode is sufficient for each base electrode.

Although the present invention has been described with respect to the configuration of the electron beam generation source, the present invention can also be applied to matrix drive type display panels such as electroluminescent display panels, plasma display panels, and liquid crystal display panels. It goes without saying that it can be done.

Effects of the Invention As described above, the effect of the present invention is that by dividing the pace electrode into n parts (n is an integer of 3 or more) in the vertical direction of the screen and applying signals to these parts independently, each cathode can be operated. It is possible to improve the data of the time to perform the image by n times, and to display a bright image equivalent to that of a conventional flat panel image display device with an electron beam amount of 1/n compared to the conventional one. The signal voltage also has a small amplitude, which reduces power consumption.

[Brief explanation of drawings]

FIG. 1 is a partial configuration diagram of an electron beam generation source of a flat panel image display device according to an embodiment of the present invention, and FIG. 2 is a drive circuit of a flat panel image display device having the electron beam generation source of FIG. 1. System diagram; Figure 3 is a diagram of output signals from the line selection/drive circuit in Figure 2; Figure 4 is a process diagram for manufacturing the electron beam generation source of the present invention; Figure 5 is a configuration diagram of a conventional flat panel display. ,
FIG. 6 is a structural diagram showing a cold cathode used in a conventional flat panel display. 10... Insulating board, 11... Terminal lead, 12...
・Insulator, 13... Pace electrode, 14... Cold cathode,
15... Gate electrode, 16... Common bus bar, 17...
- Conductive material, 21... Video signal, 22... Synchronization signal, 23... Decoder, 24... A/D converter, 25... Timing pulse generator for writing, 26
... Readout pulse generator, 27...
Memory circuit, 28... Drive circuit, 29... Line selection/drive circuit, 30... Flat image display panel, 41
...Through hole.

Claims (8)

[Claims] (1) The vertically extending electrodes for applying video signals of the image display section are vertically divided into n (n is an integer of 3 or more);
A flat panel image display device characterized in that a video signal is independently supplied to the flat panel image display device. (2) Control electrodes, which are perpendicular to the electrodes to which the n-divided video signals are applied, and which are as long in the horizontal direction as the number of horizontal lines of the image, are arranged vertically at equal pitches, and each electrode is applied to each video signal. 2. The flat panel image display device according to claim 1, wherein the control electrodes at corresponding positions are connected to a common bus bar. (3) The flat panel image display device according to claim 1, wherein the electrode to which the video signal is supplied is guided outside the image display area by a terminal lead. (4) The flat panel image display device according to claim 1 or 2, wherein the terminal leads are formed in multiple layers at a predetermined pitch in the horizontal direction via an insulating material. (5) The flat panel image display device according to claim 3 or 4, wherein the terminal leads of each layer are shifted in position in the horizontal direction between layers. (6) Form a first layer of terminal leads made of a conductive material such as metal on the surface of an insulating substrate such as glass, and form an insulating layer on top of the terminal leads except for predetermined positions of the terminal leads. , a second layer of terminal leads is formed on the insulating layer, and a predetermined position of the second layer of terminal leads and a position where the first layer of insulating layer is not formed are further formed on the second layer of terminal leads. 2. The method of manufacturing a flat panel image display device according to claim 1, wherein the second insulating layer is formed by removing the second insulating layer, and the terminal leads are formed in multiple layers by the same method. (7) The method for manufacturing a flat panel image display device according to claim 4, wherein the terminal leads and the insulating layer are formed by a screen printing method. (8) The flat plate according to claim 6 or 7, wherein when forming the second layer of terminal leads, a conductive substance is also formed on the portions of the terminal leads in the image display area where the insulating layer is not formed. A method for manufacturing a type image display device.