JPS63316085A - Matrix type display device - Google Patents

Abstract

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

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a matrix type display device, and particularly to display electrodes,
The present invention relates to a matrix display device in which each scanning electrode is electrically connected to each bus bar via an optical switch.

(Prior Art) Matrix type display devices are often used as image display devices, but matrix type display devices used in fine image display devices such as television receivers require a large number of pixels. The number of scanning electrodes and display electrodes increases. In order to draw these electrodes out of the matrix type display device, the outer periphery of the display device's substrate is made larger, the display electrodes and scanning electrodes are extended to this outer periphery, and the lead wires are connected tangentially to this outer periphery. is common.

Also, manufacturing large screen display devices all at once is
This is difficult due to the flatness and parallelism of the pair of substrates, and especially in active matrix liquid crystal display devices, there is a limit to the size of one screen due to the yield of active elements.

Therefore, when a matrix-type display device with a large screen size is required, the -screen size is usually divided into multiple display blocks, and the matrix-type display devices assembled according to the display blocks are arranged in a mosaic pattern on the top, bottom, left, and right sides. They were then electrically connected to form a large-screen matrix display device.

In this case, it is necessary to electrically connect all the scanning electrodes and display electrodes forming a matrix for each display block vertically or horizontally. Conventionally, adjacent scanning electrodes and display Ti bars are connected to each other using conductive rubber connectors. It was connected via flexible multi-strand wire.

(Problems to be Solved by the Invention) As described above, in conventional matrix display devices, as the number of pixels increases, the structures of the scanning electrodes and display electrodes become complicated, and it becomes necessary to supply signals to these electrodes from the outside. Since the number of wires to be connected increases, there are problems in that the manufacturing process is complicated and defects are likely to occur at the connection points.

Furthermore, when a large screen is constructed by arranging a plurality of such matrix display devices in a mosaic pattern, the scanning electrodes and display electrodes of each adjacent matrix display 5A must be electrically connected. Even if microfabrication is attempted, at least 2 to 3 nanometers of space is required for electrical connection, and display cannot be achieved with the band-like spaces formed on the screen of each display device.

Therefore, if such a band-shaped gap that cannot be displayed is provided, the display will be extremely difficult to see, as if an image was projected onto a shoji screen. In order to avoid this, if the above-mentioned undisplayable band-shaped gaps were provided between all pixels, the optical aperture ratio of the screen would drop to about 40% or less, resulting in a dark image. .

Further, there was a problem in that the construction of the culm at the connection between the blocks was complicated and poor connection occurred.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a matrix type display device having a pair of parallel opposed substrates having a plurality of electrodes, in which signals from busbars are controlled by light. The present invention provides a matrix type display device characterized in that the power is supplied to each of the plurality of electrodes via an optical switch.

(Embodiment) FIG. 1 is an exploded perspective view schematically showing a first embodiment of the matrix type display device of the present invention.

The first embodiment shows the case where the present invention is applied to a simple matrix type liquid crystal display device, and is 1a.

1b is a substrate, facing in parallel at equal intervals,
A plurality of band-shaped transparent scanning electrodes 2a and display electrodes 2b are provided on opposite sides of each of the substrates la and lb. Molecular orientation layers 3a and 3b (not shown) are provided on the scanning electrode 2a and the display electrode 2b, respectively.

Also, electrodes 2a, 2b and molecular orientation layer 3a.

A liquid crystal substance 4 (not shown) is sealed between the substrates 1a and 1b provided with the substrates 3b, respectively, and polarizers 5a and 5b (not shown) are provided on the non-opposing sides of the substrates la and 1b, respectively.

Here, the scanning electrode 2a and the display electrode 2b are generally I
It is formed using a TO film or NESAwA.

Moreover, although transparent glass plates are used for the substrates 1a and 1b, for example, transparent plastic plates can also be used. Furthermore, the molecular orientations 13a and 3b are different from what kind of liquid crystal material 4.
A vertical alignment layer, a horizontal alignment layer, an inclined alignment layer, etc. are appropriately selected and used depending on how the layers are arranged.

Further, as the liquid crystal substance 4, nematic phase liquid crystal, smectic phase liquid crystal, or the like is used. These are Schiff bases,
Various liquid crystal substances such as azo type, azoxy type, benzoic acid ester type, biphenyl type, terphenyl type, cyclohexylcarboxylic acid ester type, phenylcyclohexane type, biphenylcyclohexane type, pyrimidine type, dioxane type, etc. are used alone or Mix and use. Further, in order to stably align these liquid crystal molecules, an appropriate chiral substance may be added as appropriate, and in some cases, an appropriate dye may be added as appropriate.

In addition, when performing color display, a color filter may be inserted and disposed inside the liquid crystal display device, or a polarizer 5a may be used.
, 5b may be colored.

In the case of such a simple matrix type liquid crystal display device,
A pixel is formed at a portion where a plurality of strip-shaped scanning electrodes 2a and display electrodes 2b intersect with each other.

Next, the scanning electrodes 2a are all connected to the scanning busbar 7a through respective optical switch elements 6a. This scanning bus bar 7a extends to one corner of the substrate 1a and is connected to a lead terminal 8a. Furthermore, all of the display electrodes 2b are connected to a display bus bar 7b through optical switch elements 6b, and the display bus bar 7b is extended to another corner of the substrate 1b and connected to a lead-out terminal 8b.

On the other hand, at positions facing the optical switch elements 6a and 6b, light emitting elements 9a and 9b corresponding to the optical switch elements 6a and 6b, respectively, are arranged on a substrate 10 facing the substrate 1b.

Here, by appropriately selecting the light emitting elements 9a, 9b and causing them to emit light, it is possible to drive the optical switch elements 6a, 6b corresponding to the respective light emitting elements 9a, 9b. When the optical switch elements 6a and 6b are turned on, signals can be applied from the scan bus line 7a to the scan electrode 2a and from the display bus line 7b to the display electrode 2b, so that images can be displayed as appropriate.

The optical switch elements 5a and 5b are made of PbS or PbSe, which generally have a remarkable photoconductive effect in the infrared light region.

InAs or the like can be used. In this case, GaAj2AS is used as the light emitting elements 9a and 9b.

GaAsP or the like can be used. Here, as the optical switch elements 6a and 6b, general-purpose optical switch chips may be mounted on the substrates 1a and lb, but ideally the scanning electrodes 2a and 2a are placed on the substrates 1a and lb.
Optical switch elements 6a, 6b are formed by micromachining between the display electrode 2b and the display busbar 7b, and between the display electrode 2b and the display busbar 7b.
may be formed respectively.

Further, the light emitting elements 9a and 9b may also be configured in a hybrid manner using general-purpose light emitting element chips on the substrate 10, or may be configured monolithically integrally with the substrate 10.

Note that the optical switch elements 6a, 6b and the light emitting element 9a,
The optical switch elements 6a, 6b and the light emitting element 9a, such that the optical switch elements 6a, 6b and the light emitting element 9b operate in perfect mutual correspondence at all times.

It is preferable to increase the optical directivity by providing an optical hood or an optical louver between the antenna and the antenna 9b.

Glass fiber is useful as this optical hood.

If an optical hood or optical louver is used in this way, the light emitting elements 9a and 9b are the optical switch elements 5a.

It is also possible to arrange it at a location apart from 6b.

Next, the operation of such a matrix type display device will be explained. A scanning signal is supplied to the scanning bus 7a via a terminal 8a, and the scanning signal is sequentially supplied to the scanning electrode 2a by sequentially switching on the optical switch elements 6a connected to each scanning electrode 2a. This light switch element 6
As described above, the operation of a is controlled by light from the light emitting element 9a.

At the same time as the scanning signal is supplied, the terminal 8 is connected to the display bus 7b.
For example, a video signal is supplied via the light emitting element 9b, and this video signal is sent to the optical switch element 6b under the control of the light emitting element 9b.
are sequentially switched on, and are sequentially supplied to the display electrodes 2b, thereby displaying an image.

When a plurality of simple matrix type liquid crystal display devices having such a configuration are arranged in a mosaic pattern to form a large screen, electricity is applied only to the scanning bus line 7a and display bus line 7b of each liquid crystal display block adjacent to the adjacent liquid crystal display block. Since all that is required is a physical connection, in reality, the lead terminals 8a and 8b provided at the four corners of each liquid crystal display block are used to connect adjacent liquid crystal display blocks using metal solder or the like. Therefore, the present invention can provide a large screen matrix type liquid crystal display device that is relatively easy to manufacture and has extremely high reliability.

FIG. 2 is an exploded perspective view schematically showing a second embodiment of the matrix type display v device of the present invention, and this second embodiment is an active matrix type liquid crystal display device in which the present invention is applied. For example, the substrate 11a is made of transparent glass.
The scanning electrode 12a and the display electrode 12b are perpendicular to each other on the surface of the
and is installed in an insulated manner. A pixel electrode 12c is formed in a portion surrounded by the scanning electrode 12a and the display electrode 12b, and the pixel electrode 12c is connected to the display electrode 12b through the bottom of the active element. This pixel electrode 12C
The portion where 1 and 1 are sandwiched between a common electrode 12d provided on the entire surface of the substrate 11b parallel to the substrate 11a becomes a pixel.

Molecular orientation (not shown) on the pixel electrode 12c and the common electrode 12d, respectively! 113a and 13b are provided, and a liquid crystal material 14 (not shown) is sealed between the substrates 11a and 11b.

Furthermore, polarizers 15a and 15b (not shown) are provided on the non-opposed sides of the substrates 11a and 11b, respectively.

Here, scanning electrode 12a1 display electrode 12b1 pixel electrode 12
The C1 common electrode 12d is, for example, ITOI! I.

Alternatively, the substrate 11a can be formed of a NESA film or the like.

11b may be a transparent plastic plate other than a transparent glass plate.

The scanning electrodes 12a are each connected to a scanning m-line 17a via an optical switch element 16a similar to the optical switch element 6a, and the scanning bus line 17a extends to one corner of the substrate 11a and is connected to a lead terminal 18a.

Further, as in FIG. 1, the display electrodes 12b are all connected to the display bus bar 17b via optical switch elements 16b, respectively.
This display bus bar 17b extends to another corner of the board 11a and is connected to a lead terminal 18b.

Here, the active element T is a field effect Song type thin film transistor (TPT) or a metal-insulating film monometallic a (MIM)
, diodes, varistors, and other nonlinear two-terminal elements.

In this second embodiment, when the light emitting elements 19a and 19b are appropriately selected and emitted, the light emitting element 19a.

19b and corresponding optical switch elements 16a.

16b turns on. And optical switch element 16a.

When 16b is turned on, optical switch element 16a is turned on.

A signal can be applied to the pixel 12c via the pixel 16b and the active element T, allowing appropriate image display.

In the second embodiment shown in FIG. 2, a combination of the photoconductive optical switch elements 16a and 16b and the lower active element is used. In both of the above embodiments, a photovoltaic effect type switching element (for example, Light 5CR) which is activated by light outside the visible range may be used.

Furthermore, although both of the above embodiments apply the present invention to a liquid crystal display device, it goes without saying that the present invention can also be applied to matrix type display devices other than liquid crystal displays.

(Effects of the Invention) As described above, according to the present invention, at least two connection lines are required for scanning signals and display signals supplied to a matrix display device even when the number of pixels increases. The number of defects is significantly reduced, reliability is improved, and the area required at the connection point is small, so the aperture ratio can be improved to 80% or more.

Furthermore, even when a large screen is constructed by arranging a plurality of matrix display devices in a mosaic pattern, it is only necessary to bridge the above-mentioned scanning bus line and display bus line. Since each display block can be bridged using the appropriate four corners of the block, and there is no need to provide a strip-shaped gap that cannot be displayed on the side of each display block, the optical aperture ratio of the screen can be increased, and the reliability can be improved. It has the advantage of providing an excellent large screen matrix type display device.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view schematically showing a first embodiment of a matrix display device of the present invention, and FIG. 2 is a schematic exploded perspective view of a second embodiment of a matrix display device of the present invention. It is an exploded perspective view. 1a, lb, 10.11a, 11b/m board, 2a,
12a "Scan '1! Yang, 2b, 12111 ・
...Display electrode, 6a, 6b, 16a, 16b...Optical switch element, 7a, 17a-...Scanning bus bar, 7b
, 17b...Display bus line, 8a, 8b, 18a
, 18b...terminal, 9a, 9b, 19a,
19b --- Light emitting element. (1 other person)

Claims (1)

[Claims] A matrix display device having a pair of parallel substrates having a plurality of electrodes, characterized in that a signal from a bus bar is supplied to each of the plurality of electrodes via an optical switch controlled by light. Matrix type display device.