JPS6321693A - Display unit - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a large-screen display device that is constructed by arranging a large number of light emitting elements and is mainly used in outdoor stadiums and the like.

[Conventional technology]

Conventionally, in this type of large-screen display device, the display section is generally constructed by arranging a large number of single-pixel light emitting elements using CRTs or light bulbs. There are those in which single-pixel light-emitting elements of three colors R, G, and B are regularly arranged, and those in which a large number of single-pixel light-emitting elements including three colors of R, G, and B are arranged. These display devices consist of a unit made up of multiple light emitting elements and electronic circuits that drive them, and are made up of a display device with a large number of such units arranged, a control device that controls the display, and a power supply device. ), FIG. 9 is a block diagram showing an example of such a conventional display device, and in the figure, 3
0 is the screen of this display device, 3 is this screen 3
0 is a unit as a component, 6 is a plurality of units 3
13)
29 is a power source, and 29 is a display control unit that controls each unit 3 of the screen 30. FIG. 10 is a block diagram showing the configuration of the display control unit 29. In the figure, 26 is an analog-to-digital converter (hereinafter referred to as an A/D converter) that converts the input video signal into a digital signal. ,
15 is a frame memory for storing a digitized video signal; 16 is an on/off determination unit connected to the frame memory 15; and 27 is connected to the on/off determination unit 16 to select a column on the screen 30. A column selection circuit 28 is a row selection circuit that selects a row of the screen 30; 18 is an address control unit that controls addresses of this row selection circuit 28 and the frame memory 15; 22 is a connection between this address control unit 18 and the A/I ) A timing control unit 32 for controlling the timing of the converter 26 is a single pixel light emitting element, a plurality of which are arranged in a grid to form the unit 3.

Next, the operation will be explained. The video signal input to this display device is converted into a predetermined digital signal by the A/'D converter 26 and stored in the frame memory 15. The data stored in the frame memory 15 is read out according to the address corresponding to the single pixel light emitting element 32, and is sequentially converted into an on/off signal to select the single pixel light emitting element 32 specified by the column selection circuit 27 and the row selection circuit 28. supplied to Each single pixel light emitting element 32 has a memory function, and the on/off signal supplied to the single pixel light emitting element 32 is held until the signal is supplied again. Each field of the contents of the frame memory 15 is read out multiple times,
Each is converted into a predetermined on/off signal and displayed,
The cumulative value of on-time within one field is proportional to the amplitude of the video signal to be displayed by the single pixel light emitting element 32.

On the other hand, the screen 30 can have various sizes depending on how the units 3 are arranged, and the control device 29 can control various screen sizes.

[Problem that the invention seeks to solve]

Conventional display devices are configured as described above, so in order to achieve high resolution, it is necessary to arrange smaller single-pixel light-emitting elements in a higher density. Although the number of drive circuits and other peripheral circuits will increase dramatically, the cost reduction due to miniaturization of single pixel light emitting elements will be minimal, and the number of drive circuits and other peripheral circuits will increase dramatically. Since similar peripheral circuits are used, there is a problem in that it is extremely difficult to achieve high resolution, low cost, and light weight and thinness at the same time.

This invention was devised to solve the above-mentioned problems, and its object is to provide a large-screen display device with high resolution, low cost, thinness, and lightness.

[Means for solving problems]

In the display device according to the present invention, the light emitting portion uses a light emitting element of a plurality of pixels arranged in a kXt lattice, and the light emitting elements are arranged on a substrate together with a drive circuit in an iCmxn lattice to form a unit. unit like p
These units are arranged in a grid of xq to form a module together with a control circuit and a power supply for controlling these units, and a screen is constructed by arranging a plurality of these modules.

[For production]

The display device according to the present invention uses a plurality of pixel light-emitting elements each including a plurality of light-emitting parts as pixels.
In addition to reducing the cost of pixels, the unit,
By efficiently sharing functions between modules and screens, a low-cost, compact display device can be realized.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing the overall configuration of the present invention. In the figure, 1 is a light emitting element, and the light emitting parts 2 are arranged vertically in 1 pieces and horizontally in 4 pieces.
(k, t are positive integers) arranged in a lattice pattern. In the figure, = 4. The case of t=4 is shown as an example.

3 is a unit configured by arranging m light emitting elements 1 vertically and n horizontally (m and n are positive integers) in a grid. In the figure, the case of m=4sn=4 is taken as an example. Indicated. 4 is a module constructed by arranging p units 3 vertically and q horizontally (p and q are positive integers) in a grid pattern. In the figure, p=2. The case where q=2 is shown as an example. 5 is a module group in which the modules 4 are arranged vertically, 6 is a housing, and 30 is a screen configured by horizontally arranging the module group 5 and the housing 6.

The light emitting element 1 is a dot matrix type display element such as a liquid crystal or a fluorescent display tube, and displays are controlled by combining two types of control electrodes, first and second, which are orthogonal to each other.

The explanation will be given below using a fluorescent display tube as an example. FIG. 2 is a schematic sectional view showing the internal structure of such a fluorescent display tube. 9 is a cathode that emits thermoelectrons, 8 is a grid that accelerates electrons, 7 is an anode coated with a fluorescent substance, and 10
is a wiring for applying voltage to the anode 7, 11 is an exhaust port,
12 is an electrode for external connection. In this fluorescent display tube, a fluorescent substance coated on the surface of the anode 7 emits light when thermoelectrons from the cathode 9 collide with the anode 7. controlled. Here, the column 7 corresponds to the first control electrode, and the grid 8 corresponds to the second control section ff1K. FIG. 3 is an explanatory diagram showing the configuration of the control electrodes that control the display.The grid 8 has four electrodes Y1 to Y4 in common in the row direction, and the anode 7 has four electrodes X1 to X4 in the column direction. They are commonly connected to form a matrix, and the display of the light emitting sections 2 arranged corresponding to the intersections of the two orthogonal control TL poles is controlled. When configuring a full color display device, R
The anode is coated regularly with three types of fluorescent substances: (red), G (green), and B (blue). In particular, if the number of R, G, and B light emitting parts 2 is R:G:B = 1:2:1 and the pixel arrangement is as shown in Figure 3, a color display device with an advantage in resolution can be obtained. It will be done.

As shown in FIG. 1, the unit 3 includes a plurality of pixel light emitting elements 1 such as fluorescent display tubes, a shift register,
It is constructed by arranging its driving circuits including latches and the like on a substrate. Here, since the control electrodes of the light emitting element 1 are arranged in a matrix as described above, the number of electrodes 12 drawn out to the outside of the light emitting element 1 can be reduced, and the number of drive circuits can be reduced, and the structure of the unit 3 can be reduced. can be simplified.

As shown in FIG. 4, the module 4 is composed of a plurality of units 3, a control circuit 31 for controlling them, and a power supply 13. In the conventional display device, the display control unit 29 or the power supply 13 is centrally installed outside the screen 6 as shown in FIG. In contrast, in the present invention, it is distributed and arranged in each module 4,
The circuit configuration of the control circuit 31 is simplified by providing a restriction that only a limited portion is controlled. In particular, the number of light emitting parts 2 included in the light emitting element l (kXt)
, the number of light-emitting elements 1 included in unit 3 (mXn), and the number of units 3 included in module 4 (pXq) O in the relationship = 2rs L = 2S (rsa is a positive integer)
, m=2t* n==2u* p=2v* q=2”
(tsu eV pVI is a non-negative integer) and the control circuit 3 has a configuration that is advantageous for digital signal processing.
1 can be configured efficiently. In particular, as shown in FIG. 5, the arrangement of the unit groups forming the module 4,
By arranging the control circuit 31 and the power supply 13, it can be made more compact. FIG. 6 is a block diagram showing the configuration of the control circuit 31. In the figure, 1
5 is a frame memory, 16 is an on/off determination unit connected to the frame memory 15, 19 is a unit selection gate connected to the on/off determination unit 16 and selects the unit 3, 18 is a frame memory 15, an on/off determination unit - An address control section that performs address control of the off determination section 16 and the unit selection gate 19; 17 is a timing control section that performs timing control of the address control section 18;

Here, it is difficult to directly transmit the digital video signal sampled at high speed to each module 4 using a flat cable. However, as shown in FIG. A module group 5 is formed by arranging a plurality of module groups 5 to form a screen 30. In addition, in the figure,
Reference numerals 24 and 25 are a buffer and termination section of the common signal line 14, 26 is an A/D converter that converts the input video signal into a digital signal, and 21 is provided corresponding to the module group 5, and is an A/D converter. a buffer memory 22 that stores the digital video signal from the D converter 26 and performs speed conversion;
2 is a timing generating section that controls the timing of the A/D converter 26 and the buffer memory 21, and 20 is a signal supplying means constituted by these components.As shown in FIG. It is housed in the casing 6 together with a power distribution means 33 for distributing power.

Next, the operation will be explained. The input video signal is
The signal is converted into a predetermined digital signal by the A/D converter 26 of the signal supply means 20, and is temporarily stored in the buffer memory 21 provided corresponding to each module group 5.

The video signal stored in the buffer memory 21 is read out at low speed, an address is added, and the video signal is individually sent to the corresponding module group 5. Each module group 5 receives the video signal in a buffer 24 and transmits it to each module 4 via a common signal line 14. Here, since the video signal received by the buffer 24 is converted at low speed by the buffer memory 21 as described above, a flat cable can be used as the common signal line 14.

Each module 4 has an address and inputs a corresponding portion of the video signal through the common signal line 14 according to the address. The input video signal is once written into the frame memory 15 of the control circuit 31, and then the address control section 1
8 is read out, sequentially converted into an on/off signal, and sent to a predetermined unit 3 by a unit selection gate 19. In each unit 3, this video signal is sent to each light emitting element 1 arranged in a grid pattern, and a predetermined light emitting section 2 is sent.
emits light at a predetermined brightness.

FIG. 8 is a time chart of signals applied to the fluorescent display tube 1 as the light emitting element 1. Y on the 4 grids 8
Scanning signals with different timings are periodically inputted at l=Ya, and a predetermined video signal is inputted to each of the anodes X1 to X4 in synchronization with the scanning signals to the anode 7, causing the light emitting section 2 at the intersection point to emit light. let In such a matrix type light emitting element 1, the display of each light emitting part 2 cannot be controlled individually, but it is controlled in a time division manner row by row according to a scanning signal, and continuous display is realized by increasing the scanning speed. There is. In addition, the display of intermediate gradations can be achieved by inputting a signal proportional to the amplitude of the video signal to the anode 7.
This is achieved by changing the brightness of the light emitting section 2.

In this way, the video signal is processed by each module 4,
Although one unified image is displayed on the screen 30 as a whole, each module 4 only displays a part of the image, and its display function is limited, but it is necessary as a display device. Control circuit 31. It includes a power supply 13, etc., and functions as a display device by itself.Therefore, the screen 30, which is an assembly of such modules 4, can be simplified in structure by simplifying the module 4. It can be simplified.

As shown above, the control circuit 31 and the power supply unit, which are the main signal processing parts of the display device, are included in the module. In addition, a video signal A/I) converter 26
By arranging the signal supply means 20 including the buffer memory 21 and the signal supply means 20 in the casing 6 constituting one screen 30 together with the power supply distribution means 33 that inputs power and distributes the power to each module, all Functions are consolidated to create a compact configuration.

In the above embodiment, the light emitting element, unit module, module group, and screen are shown divided into individual functional blocks, but for example, when m=n=1, the unit is composed of the light emitting element 11 alone, Also I)=(1
If =1, unit 3 and module 4 match. In particular, the case where m=n=p=q=1 is also considered, but in this case -
A module can also be configured with just one light emitting element. Further, although the above description has been given as an example of a fluorescent display tube, the present invention can be applied to various displays such as liquid crystal, plasma display panel, and electroluminescent display.

〔Effect of the invention〕

As described above, according to the present invention, a multi-pixel light-emitting element in which a plurality of light-emitting parts are arranged in a grid is used as a light-emitting element, and the mXH grid arrangement of the multi-pixel light-emitting elements allows the unit to be Unit pxq lattice array (
(m, nap+q are both positive integers) to form a module, and a plurality of these modules are arranged to form a screen, so the function as a display device is sequentially increased in efficiency from the light emitting element, unit, and module. In addition, the light-emitting elements are extremely inexpensive compared to the same number of single-pixel light-emitting elements as the number of light-emitting parts, so it is possible to produce high-resolution, large-screen display devices without increasing the price. 1.It has the effect of being realized without increasing weight or thickness, etc.0

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing a display device according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view showing the structure of a fluorescent display tube as an example of the light emitting element, and FIG. 3 is a diagram of the control electrode of the display device. FIG. 4 is a block diagram showing the structure of the module of the display device, FIG. 5 is a partially cutaway perspective view showing the structure of the display device, and FIG. 6 is the structure of the control circuit of the module. FIG. 7 is a block diagram showing the configuration of the module group and signal supply means of the display device,
FIG. 8 is a time chart of signals given to the light emitting element, FIG. 9 is an overall configuration diagram showing a conventional display device, and FIG.
The figure is a block diagram showing the configuration of the display control section. 1 is a light emitting element, 2 is a light emitting part, 3 is a unit, 4 is a module, 5 is a module group, 6 is a housing, 7 is a first control electrode (Yomaki), 8 is a second control electrode (grid) , 13 is a power supply, 14 is a common signal line, 15 is a frame memory, 2
0 is a signal supply means, 3° is a screen, 31 is a control circuit, and 33 is a power distribution means. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (7)

[Claims] (1) In a display device configured by arranging a plurality of light-emitting elements in a grid to form a screen and housing this screen in a housing, the light-emitting element has k light-emitting parts vertically and l light-emitting parts horizontally. (k, l are positive integers) A plurality of pixel light emitting elements arranged in a grid are used, and m light emitting elements are arranged vertically and n horizontally (m, n are positive integers) on the substrate. form a unit with those drive circuits, and this unit is vertically connected to
q units (p and q are positive integers) are arranged horizontally, forming a module together with a control circuit including a frame memory corresponding to the screen formed by the unit group and a power supply, and arranging a plurality of these modules. A display device characterized in that the screen is configured by. (2) The numbers k and l of the light emitting parts arranged vertically and horizontally are k=2^
r, l = 2^s (r, s are positive integers), the number m and n of the vertical and horizontal arrangement of the light emitting elements are m = 2^t, n = 2^u (t
, u are non-negative integers), and the numbers p and q of the vertically and horizontally arranged units are p=2^v, q=2^w (v, w are non-negative integers). Range number (1)
The display device described in section. (3) In the light-emitting element, the control electrodes for controlling the light-emitting section are composed of a first group of control electrodes commonly connected in the vertical direction and a second group of control electrodes commonly connected in the horizontal direction. is,
Claim (1) characterized in that each of the light emitting parts is arranged corresponding to the intersection of both control electrode groups.
or (2). (4) The light emitting portion of the light emitting element is R (red) and G (green).
, B (blue), and their abundance ratio in the light emitting element is R:G:B=1:2:1. Chapter (3)
A display device according to any of the paragraphs. (5) A plurality of the modules are arranged vertically or horizontally to form a module group in which the signal input section of each module is connected to a common signal line, and a plurality of the modules are arranged horizontally or vertically. The display device according to any one of claims (1) to (4), characterized in that the screen is configured by arranging the screen. (6) A patent claim characterized in that the housing accommodates therein a signal supply means for inputting a signal, converting it into a predetermined digital signal, and supplying the signal to the common signal line of each of the module groups. The display device according to the scope item (5). (7) Claims (1) to (6) characterized in that the casing houses therein a power distribution means for inputting electric power and distributing the electric power to each of the modules. A display device according to any of the paragraphs.