JPH0326537Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a liquid crystal panel used in an image display device or the like.

(Prior Art) Liquid crystal display devices have characteristics such as thinness and low power consumption, and are widely used as display devices for various terminals including portable devices. Recently, development has been actively underway to increase display capacity and display area.

In order to increase the display capacity, by attaching thin film transistors made of amorphous silicon or polysilicon to each display pixel as switching elements, the number of scanning electrodes due to crosstalk that occurs in the case of time-division drive display called simple matrix method can be reduced. There is active development of so-called active matrix liquid crystal panels that remove these limitations. In addition to thin film transistors, switching elements include thin film diodes and metal-insulating film-metal configurations.
A large number of MIM devices and other devices are being studied. The development status of these active matrix methods is detailed in, for example, Nikkei Electronics No. 333 (published by Nikkei McGraw-Hill).

However, in active matrix type liquid crystal panels, although in principle the restriction on the number of scanning electrodes is removed, in reality it is necessary to stack switching elements for each display pixel, and the number of switching elements increases. Due to the enormous size, extremely fine dimensions, and complicated manufacturing process, it is extremely difficult to produce a large-scale replica array of defect-free switching elements, resulting in low manufacturing yields and high manufacturing costs. ing. Therefore, currently the prototype has a pixel count of 325 x 325 and an area of 130 x 130 mm2 ^.
It has been reported that the LCD panel of
Even compared to a cathode ray tube (CRT), which has a resolution of 1000 lines and can easily display the size of an A4 sheet of paper, it is still inferior in terms of large area and large display capacity.

On the other hand, in order to achieve a large-area display, a large-screen display device in which a large number of liquid crystal panels are arranged in a mosaic pattern has recently been developed. This technique will be explained using figures.
FIG. 1 is a schematic plan view of a conventional conventional liquid crystal panel, and the areas where electrodes 11 and 12 arranged in a matrix intersect (the shaded area in the figure) constitute pixels. In this figure, an example of 5×5 pixels is shown. All of the liquid crystal panels are sealed around the periphery with an adhesive, and in FIG. 1, reference numeral 13 indicates the adhesive layer. FIG. 2 is a schematic plan view of a conventional large-area liquid crystal panel constructed by arranging the four liquid crystal panels shown in FIG. 1 in a mosaic pattern. In the liquid crystal panel shown in FIG. 2, the pixel spacing is widened by the liquid crystal panel fixing frame 21 and the adhesive layer 13, and even if large-area display is performed, a grid-like area that cannot be used for display becomes conspicuous, and the image quality deteriorates significantly. There is a drawback.

(Purpose of the invention) An object of the invention is to provide an inexpensive liquid crystal panel that has a large display capacity and display area and can display high-quality images.

(Structure of the invention) The structure of the invention is that in a liquid crystal panel having a structure in which a liquid crystal substance is sandwiched between two opposing plate-like parts with electrodes, one of the plate-like parts with electrodes is juxtaposed closely to each other. The device is characterized by consisting of a plurality of substrates, and a resin sheet that is attached to the surfaces of these substrates and shoots the substrates together.

(Example) The present invention will be described in detail with reference to Examples below.

FIG. 3 is a schematic plan view of the first embodiment of the present invention, and FIG. 4 is a schematic cross-sectional view taken along the plane AA' in FIG. The structure and operation of this embodiment are as follows. 31 is a support substrate (glass) having an electrode group 41 made of indium oxide. 32, 33, 34, 35 are
Electrode groups 42, 43 made of indium oxide,
44 and 45, respectively,
Spacers 3 made of fine glass fibers are juxtaposed so that their sides touch each other.
It is fixed with an epoxy adhesive layer 38 so as to face the supporting substrate 31 with electrodes 7 between them. Furthermore, a resin sheet 36 known as lamination is adhered to the surfaces of the glass substrates 32, 33, 34, 35.
covers the joints of the The glass substrate bonding portion on the outside of the resin sheet 36 is subjected to a normal molding process. Since there are no pixels in the mold processing section, it does not affect image quality. Between the spacers 37 and 37, there is a liquid crystal material ZLI-1285 (manufactured by Merck,
(not shown) are held in place.

This liquid crystal panel has an electrode 41 and an electrode 42,4
When a voltage is selectively applied between 3, 44, and 45 and the image is observed while being sandwiched between two polarizing plates, an image can be displayed by normal twisted nematic (TN) operation. In this liquid crystal panel, the substrate 32,
The joints 33, 34, and 35 are completely unnoticeable, and the spacing between the display electrodes at those parts is exactly the same as the electrode spacing on the individual substrates. There were no problems such as deterioration of image quality due to the presence of areas, and a uniform display of extremely good image quality was obtained over a large area. Note that no deterioration in the robustness of the liquid crystal panel was observed due to the bonding of multiple substrates. This is because each of the plurality of substrates is firmly adhered to one support substrate facing each other via a spacer.

In the above embodiment, since the resin sheet 36 had a transparent single layer structure, a single polarizing plate was used in front of it. However, in the present invention, the resin sheet is not limited to a single layer structure, but may have a multilayer structure. For example, in a liquid crystal panel with a structure in which the resin sheet 36 is replaced with an adhesive polarizing plate (multilayer resin sheet), in addition to the features of the above-mentioned embodiment, such as a large area and uniformly good image quality, a liquid crystal panel with a structure that is simple and
Even better effects can be achieved with a thinner profile and lower price. Furthermore, in a liquid crystal having a structure in which the resin sheet 36 was replaced with an adhesive patterned color filter film, a color display was obtained over a large area and with uniform and good image quality as described above. Next, another embodiment of the present invention, which is particularly effective in increasing display capacity and lowering the cost of liquid crystal panels, will be described.

FIG. 5 is a schematic plan view of a second embodiment of the present invention, and FIG. 6 is a schematic cross-sectional view taken along line BB' in FIG. The configuration and operation of this embodiment will be explained with reference to these figures. 51 is a support substrate (glass) having an electrode 61 made of indium oxide. 52,53,5
4 and 55 are electrode substrates having a structure in which a switching element array consisting of amorphous silicon thin film transistors 70 is attached to all pixel electrodes 71, and 72 and 73 are gate buses and gate buses for applying drive signals to the thin film transistors 70, respectively. It is a drain bath. In addition, gate bus 72
and the drain bus 73 are insulated by an insulating film (not shown). Multiple electrode substrates 52, 53, 5
4 and 55 are arranged side by side so that their sides are in contact with each other, and a resin sheet 56 is adhered to the surface of the resin sheet 56 to cover the joint part and constitute a support substrate with electrodes. It is fixed with an epoxy adhesive layer 58 facing the support substrate 51 with electrodes with a spacer 57 placed therebetween. The electrode 61 is formed on the entire surface of the support substrate 51 in a region surrounded by the epoxy adhesive layer 58. Spacer 5
A liquid crystal material ZLI-1565 (manufactured by Merck & Co., not shown) is held between the holes 7 and 7. In addition,
The electrode 61 is connected to an electrode terminal 59 provided on the opposing electrode substrate 52.

In this liquid crystal panel, in a pixel connected to the gate bus 72 to which a voltage is applied, the pixel electrode 7 is connected to the drain bus 73 and the electrode terminal 58.
A voltage is applied to the liquid crystal between the electrode 1 and the electrode 61, and normal active matrix liquid crystal driving is performed. The operation of the liquid crystal is TN operation. The function of the switching element is well known, and a large-capacity display was obtained without the problem of crosstalk that occurs in the case of a simple matrix method.

5 and 6, for convenience of explanation, substrates 52 and 5 having switching elements are shown.
3, 54, and 55, the number of pixels per sheet was 3.times.4, but in reality, substrates having 220.times.330 switching elements per sheet were obtained with a good yield. The area is ^90x70cm2 . however,
Attempting to increase the capacity further will result in extremely low manufacturing yields, and in order to manufacture larger-area substrates, extremely large and expensive equipment will be required for film formation, exposure, etc. for forming thin film transistors. As a result, manufacturing costs rose significantly. In other words, with conventional technology, even active matrix type liquid crystal panels capable of increasing capacity can only display 220 x 330 pixels at an appropriate price.
The practical limit was about 90 x 70 cm ² in pixels. However, according to this embodiment, by connecting four substrates having switching elements to form a single support substrate, the manufacturing yield and manufacturing equipment are the same, and 440×
A liquid crystal panel of approximately 180 x 140 cm ² with 660 pixels was easily obtained. Therefore, this embodiment has a large capacity, a large area, and is inexpensive. In terms of image quality, there was a problem with the integration of liquid crystal panels using conventional technology in that the grid-like joints were noticeable and the image quality deteriorated significantly, but with the liquid crystal panel of this embodiment, the joints were not noticeable and an extremely uniform and high-quality image could be obtained. It was done. It should be noted that the liquid crystal panel of this example was also found to have sufficient robustness, which is the same as the example shown in FIG. 3 described above. Further, even in a liquid crystal panel having a switching element as in this embodiment, even more effects can be obtained by using a functional sheet such as a polarizing plate or a color filter as the resin sheet. Note that in the first and second embodiments,
Although one supporting substrate is constructed with four substrates, in the present invention, one supporting substrate can also be constructed by arranging more substrates in parallel.

(Effects of the invention) As described above, according to the invention, it is possible to provide an inexpensive liquid crystal panel that has a large display capacity and display area and can display high-quality images.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view of a liquid crystal panel with a conventional structure, Fig. 2 is a schematic plan view of a large-area liquid crystal panel using conventional technology, and Fig. 3 is a schematic plan view of a first embodiment of the present invention. Fig. 4 is a plan view of A- in Fig. 3.
5 is a schematic plan view of the second embodiment of the present invention, and FIG.
FIG. 2 is a schematic cross-sectional view taken along line B-B' in the figure. 11, 12... Electrode, 13... Adhesive layer, 21
... Fixed frame, 31 ... Support board, 32, 33, 3
4, 35...Substrate, 36...Resin sheet, 37...
...Glass fiber spacer, 38...Adhesive layer, 41, 42, 43, 44, 45...Electrode, 5
1... Support substrate, 52, 53, 54, 55... Substrate, 56... Resin sheet, 57... Glass fiber spacer, 58... Adhesive layer, 59... Electrode terminal, 61... Electrode, 70... ... Switching element, 71 ... Pixel electrode, 72 ... Gate bus, 7
3...Drain bath.

Claims (1)

[Claims for Utility Model Registration] (1) In a liquid crystal panel in which a liquid crystal material is sandwiched between two opposing plate-shaped parts with electrodes, one of the plate-shaped parts with electrodes is in close contact with each other. A liquid crystal panel comprising a plurality of substrates arranged side by side, a resin sheet attached to the surfaces of these substrates and interconnecting the substrates, and the other consisting of a single substrate. (2) The liquid crystal panel according to claim 1, wherein the resin sheet is a polarizing plate. (3) The liquid crystal panel according to claim 1, wherein the resin sheet is a color filter.