JPS63183420A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To easily obtain a large-sized display screen having good quality with a decreased dead space by joining many divided substrates to form a 2nd transparent substrate and connecting the respective picture elements and electrodes of the divided substrates by thin film diode switching elements. CONSTITUTION:Many 1st electrodes 5 having nearly the same width as the width of the respective picture elements 11 are provided in a Y direction on the rear face of the 1st transparent substrate. The 2nd transparent substrate 2 is disposed oppositely to the 1st transparent substrate 1 and a liquid crystal 4 is filled into the spacing therebetween. The substrate 2 is constituted of the divided substrate groups arranged and joined with many pieces in the X direction. The respective picture element electrodes 11 on the divided substrates are connected to the 2nd electrodes 6 by the switching elements 12 for which the thin film diodes are used. The 3rd transparent substrate 3 is constituted of a plane glass sheet having nearly the same size as the size of the 1st transparent substrate and is press-welded to the rear face side of the substrate group 2 by means of a transparent elastic film body 16 in order to hermetical ly seal the joint parts of the divided substrate groups 2-i to each other. The good- quality large-sized display screen having the decreased dead space such the sealing part for every liquid crystal display element and space for wiring is obtd. by such constitution.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a liquid crystal display device that is capable of achieving higher density pixel arrangement and higher resolution of the display screen, and is suitable for increasing the size of the display panel. In particular, the present invention relates to a liquid crystal display device suitable for use as a laminated type flat panel.

[Conventional technology]

Conventionally, for example, a hacklight type liquid crystal display device, which is one type of flat panel display device, has a large number of transparent pixel electrodes arranged in a lattice pattern, and the voltage value applied to the pixel electrode at each lattice point varies. The amount of uniform background light that is transmitted is modulated according to the amount of light transmitted through the transparent substrate, and thereby an image consisting of a bright and dark pattern is displayed on the front side of the transparent substrate.

As one form of such a bank light type liquid crystal display, for example, as shown in FIG. It is known to form a two-dimensional display device with a desired area by connecting a large number of liquid crystal display elements 101 in a grid pattern in the X and Y directions as shown in FIG.

[Problem to be solved]

However, in the hacklight type liquid crystal display device shown in FIG. Unnecessary areas, such as dead spaces, are formed on the display screen, such as spaces for stopping parts and wiring. For this reason, in a liquid crystal display device having such a configuration, the existence of the dead space poses a problem as it becomes an obstacle to increasing the density of the pixel arrangement and increasing the resolution of the display screen.

Therefore, in view of the above-mentioned conventional drawbacks, the present invention is capable of suppressing the formation of dead spaces as much as possible, increasing the density and resolution of the display screen, and providing a liquid crystal display suitable for forming a large screen. The purpose is to provide a device.

[Means for solving problems]

That is, the present invention provides a first transparent substrate having a size corresponding to a display panel in which a large number of transparent first electrodes having approximately the same size as each pixel are formed along a certain direction; A second transparent substrate in which a pixel electrode group consisting of electrodes is formed to face the first transparent substrate, and a liquid crystal filled in a sealed gap between the first transparent substrate and the second transparent substrate. A liquid crystal display device having one side of the first transparent substrate as a display surface, wherein a large number of the second transparent substrates are arranged along a predetermined direction orthogonal to the direction in which the first electrodes are formed.
It is composed of a group of bonded divided substrates, and a transparent second electrode connecting the pixel electrodes to each other via a switching element using a thin film diode is formed on the surface of the divided substrate, and A third transparent substrate having substantially the same size as the first transparent substrate is closely attached to the back side of the group opposite to the second electrode forming surface.

[Effect]

In the liquid crystal display device of the present invention, a second electrode is formed in a direction orthogonal to the first electrode for each divided substrate constituting the divided substrate group, and each of the second electrodes is provided with a thin film that is a two-terminal element. Since a switching element using a diode (hereinafter referred to as TFD) is provided, electrical connection between the second electrodes is no longer necessary, making it possible to simplify the bone structure. It is something that

Further, the liquid crystal display device of the present invention includes a divided substrate group in which the second transparent substrate is divided into a plurality of pieces and joined together along a predetermined direction, and these divided substrate groups are connected to the first transparent substrate and the third transparent substrate. It is sandwiched between transparent substrates to prevent the formation of unnecessary dead space when displaying images, and as a result, it is possible to increase the resolution and density of the display screen, and also to increase the size of the display screen. This is something that can be done.

〔Example〕

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

1 and 2 show a liquid crystal display device according to the present invention, which includes a first transparent substrate 1,
A second transparent substrate 2, a third transparent substrate 3, a liquid crystal 4, and a first
It is composed of an electrode 5 and a second electrode 6. In the figure, reference numerals 7 and 8 respectively refer to a polarizing plate that transmits only the horizontally polarized component of the incident background light, a polarizing plate that transmits only the vertically polarized component of the light emitted from this polarizing plate, and 9 for each pixel. Divided into Let (R), Green (G),
Color filter with blue (B) filter,
10 is aluminum oxide (AI) interposed in gear G.
□03) etc.

The first transparent substrate 1 is composed of a single glass plate having a planar shape having approximately the same dimensions or larger dimensions than the display panel on which an image is formed. An electrode 5 is formed. This first
The electrode 5 constitutes a scanning electrode to which a voltage corresponding to a scanning signal is applied, and as shown in FIG. It is formed. Then, this first electrode 5
They are formed along the Y direction at positions exactly facing each pixel electrode 11 on the back side of the transparent substrate 1 where the liquid crystal 4 is filled.

A large number of second transparent substrates 2 are arranged along a certain direction, that is, the X direction, and each divided substrate group 2-i (i=1. 2. 3...) is joined by a transparent adhesive material. These divided substrates 'l-i are provided with pixel electrodes 11-i j (i, j=1゜2), which will be explained later.
．． 3. ...) is formed. Furthermore, each divided substrate 2-1 configuring this divided γ plate group 2-1. ,2-2
．． 2-3. ... is made of a transparent glass plate, and the joint end surfaces to be joined to each other are mirror-finished, and the sides between these joint ends are sealed with the transparent adhesive material mentioned above. It is joined. As shown in FIG. 3, for example, pixel electrodes 11-31, 1132, 11-33. ...
... are provided in sequence. Further, each of these pixel electrodes 2-2 is connected to a thin film diode (TFD) 12 as a switching element for selectively and independently applying voltage to the pixel electrode for each pixel.

Note that this thin film diode (TFD) is composed of a diode ring, which is a two-terminal element that connects the scanning line 13 side and each pixel 15 side connected to the signal line 14, as shown in FIG. The diode ring of this example has a structure in which two series-connected diodes are connected in antiparallel, and each diode has a structure in which an amorphous silicon layer with a pin junction is sandwiched between metal films. ing.

These thin film diodes (TFDs) 12 are connected to the same divided substrate group 2-i (+=1.2, 3.
*) are connected to each other by the second electrode 6. The second electrode 6 constitutes a transparent signal electrode to which a voltage corresponding to the video signal is applied, and each divided substrate group 2-i (i=1°2.3... ) is formed along the X direction perpendicular to the first electrode 5. Note that this second electrode 6 is connected to each divided substrate group'1-i(i-]+2.3.....)
It is formed only on the front surface side, and is not formed on the back surface side of each divided substrate group 'l-4.

The third transparent substrate 3 is composed of a single glass plate having a planar shape and having approximately the same size as the first transparent substrate. Then, this third transparent substrate 3 is divided into the divided substrate group 2-i.
(i=1. 2. 3...), and these divided substrate groups 2-i (i-1, 2, 3, . . .
...) A divided substrate group 2-4 (i = 1° 2.3・・・・・・）It is designed to be crimped on the back side.

Therefore, according to the liquid crystal display device according to this embodiment, when a predetermined voltage is sequentially applied as a scanning signal to the first electrode 5 side, and a voltage corresponding to a video signal is applied to the second electrode 6 side, Selectively thin film diode (TFD) 12
is activated. Then, the pixel electrode 1 where the conduction was made
A predetermined voltage is applied between the l-1j side and the first electrode 5 side, and background light passes through the pixel portion of the liquid crystal 4 corresponding to the one to which the voltage is applied, thereby causing the first transparent substrate 1 An image is formed using one side as a display surface.

〔effect〕

As described above, according to the liquid crystal display device of the present invention, the second transparent substrate is constituted by a group of divided substrates in which a large number of divided substrates having a desired width dimension are bonded together, and therefore the width of the divided substrates is A large display screen can be easily formed by stacking a large number of divided substrates along a predetermined direction orthogonal to the direction.

Further, the liquid crystal display device according to the present invention includes a first transparent substrate,
It has a three-layer structure consisting of a second transparent substrate and a third transparent substrate, and the gap filled with liquid crystal is not divided into multiple parts and has the same size as the screen, preventing the formation of dead spaces. Since this is prevented, it is possible to achieve higher density, higher resolution, etc., and thereby high quality products can be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a liquid crystal display device according to the present invention;
2 is a sectional view taken along the line l-I in FIG. 1, FIG. 3 is a perspective view showing the second transparent substrate of the liquid crystal display device according to the present invention, and FIG. TF
D) A wiring diagram showing the configuration, Fig. 5 is an explanatory diagram showing a conventional modularized liquid crystal display element, and Fig. 6 is a backlight type in which the liquid crystal display elements shown in Fig. 5 are combined in a grid pattern. FIG. 2 is an explanatory diagram showing a liquid crystal display device. 5...First electrode. 1...First transparent substrate. 1l-ij...Pixel electrode group. 2...Transparent substrate. 4...LCD. 2-i......Divided board group. I2...Switching element. 6...Second electrode. 3...Third transparent substrate. 16...Transparent elastic membrane body. Applicant NEC Home Electronics Co., Ltd. Agent Patent Attorney Masu 1) Takeo Figure 5

Claims (1)

[Scope of Claims] 1. A first transparent substrate having a size corresponding to a display panel in which a large number of transparent first electrodes having approximately the same size as each pixel are formed along a certain direction; a second transparent substrate in which a pixel electrode group consisting of each pixel electrode is arranged to face the first transparent substrate; and a liquid crystal filled in a sealed gap between the first transparent substrate and the second transparent substrate. A liquid crystal display device having one side of the first transparent substrate as a display surface, wherein a large number of the second transparent substrates are arranged along a predetermined direction orthogonal to the direction in which the first electrodes are formed. It is composed of a group of joined divided substrates, and a transparent second electrode connecting the pixel electrodes to each other via a switching element using a thin film diode is formed on the surface of the divided substrate, and the divided substrate A liquid crystal display device, characterized in that a third transparent substrate having substantially the same size as the first transparent substrate is closely attached to the rear surface side of the group opposite to the second electrode forming surface. 2. In order to equalize the pressure bonding force between the divided substrate group constituting the second transparent substrate and the third transparent substrate, there is a space between the divided substrate group and the third transparent substrate that is approximately the same size as the third transparent substrate. 2. The liquid crystal display device according to claim 1, wherein a transparent elastic film having a certain size is interposed. 3. The liquid crystal display device according to claim 1 or 2, wherein the joint end surfaces of the divided substrates constituting the divided substrate group are mirror-finished.