JPS63289527A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To prevent degradation in video quality owing to the scattering and reflection of back light at the joint parts by packing a transparent adhesive agent having the light refractive index approxiametely equiv. to the light refractive index of bar-shaped transparent substrates to the joint parts between the bar-shaped transparent substrates. CONSTITUTION:Picture elements 6 are arranged in parallel between the 1st glass substrate 1 and the 2nd glass substrate 2 in the state of bringing the mirror-finished joint end faces of the bar-shaped glass substrates 7 into contact with each other. The transparent adhesive agent having the light refractive index nearly equiv. to the light refractive index of the substrates 7 is packed in the joint parts (a) of the substrates 7 and the substrates 7 are joined to each other by the adhesive agent. These joint parts has the state as if the entire part of the bar-shaped glass substrate groups is a sheet of plate at the time of video displaying. The scattering or reflection is thereby decreased and backlight is smoothly transmitted.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a liquid crystal display element.

[Prior Art] Conventional general liquid crystal display elements have a structure in which liquid crystal is sealed in the space between two glass substrates facing each other with a wide display screen, and one glass substrate has a grid-like structure. It has a structure in which an array of transparent pixel electrode groups are formed, and a transparent counter electrode (or common electrode) is formed on the positive substrate on the capture side. That is, the pixel electrode group was formed on a single glass substrate, similar to the counter electrode side. This structure is the same when used as a single liquid crystal display element or when used as a liquid crystal module for forming a large screen by connecting a large number of elements vertically and horizontally.

[Problem to be Solved by the Invention 1] However, in the structure in which pixel electrode groups are formed in a grid pattern on a single positive substrate as described above, a switching element is arranged for each pixel in order to improve contrast, etc. During formation, it is not always easy to obtain a single positive substrate without any defects, so defective products are likely to occur, resulting in a low yield. In view of these circumstances, the applicant of this patent has developed a rod-shaped plus substrate in which pixel electrodes are arranged linearly in 2 to 3 rows between two opposing lath substrates that have the width of a display screen. We have developed a liquid crystal display element with a structure in which a large number of these electrodes are connected in parallel to form a group of pixel electrodes arranged in a lattice pattern. By the way, in the case of a hydrogen element having a structure in which the rod-shaped glass substrates are used, it is necessary to maintain the joint direction 5 between the rod-shaped glass substrates, but if the rod-shaped glass substrates are simply brought into contact with each other, Insufficient airtightness. However, when the seams are joined using adhesive to achieve airtightness, when images are displayed on this liquid crystal display element, backlight light is scattered or reflected at the seams, causing linear images to appear on the image. Non-display area (scattered emission lines)
, or appear as a linear shadow, causing a reduction in video quality.

The present invention has been made in view of the above-mentioned circumstances, and includes scattering and reflection of backlight at the joints between the rod-shaped glass substrates in a liquid crystal display element using rod-shaped glass substrates in which pixel electrodes are linearly arranged. The purpose is to prevent the quality of the video from deteriorating due to

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, a large number of bar-shaped transparent substrates each having pixel electrodes arranged in a straight line are arranged in parallel, thereby forming pixels in a lattice arrangement. In the liquid crystal display device in which the electrode group was formed, the joint between the rod-shaped transparent substrates was filled with a transparent adhesive having an optical refractive index of about 11 that of the rod-shaped transparent substrates.

[Function] In the above configuration, if the gap between the joints between the rod-shaped transparent substrates is filled with a transparent adhesive having the same optical refractive index as the rod-shaped transparent substrates, the backlight will be significantly scattered or reflected at the joint. The backlight light is smoothly guided to the liquid crystal cell part. Therefore, it is possible to prevent the linear shadow of the joint part or the non-display part (scattered bright line) of the scattered 6L image from appearing on the image display surface.

[Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Fig. 1 is a cross-sectional view of a main part of a liquid crystal display element showing an embodiment of the present invention, Fig. 2 is an overall front view of the liquid crystal display element in Fig. 1 corresponding to the ■-■ arrow view, and fIS3 is the same Fig. 1. - It is an enlarged view of the main part in arrow view. In each figure, 1 is the glass substrate on the display screen side (this is called the first glass substrate), 2 is the glass substrate on the backlight side (this is called the 27th glass substrate),
These JP, 1 are the lath board 1. The second glass substrate 2 is -
Each one is a single plate with an area the same as or slightly larger than the display screen, and is placed facing each other. Said @1. f
On the inner surface of the lath convex plate 1, many rows of counter electrodes 3 extending in the vertical direction in the figure are formed, and on the outer surface, polarized light @4 is pasted. Further, the biased bias plate 5 is also attached to the outer side 1101 of the second glass substrate 2.

Fan Note No. 177' Between the last convex plate 1 and the second positive substrate 2, there is a rod-shaped positive substrate 7 in which pixel electrodes 6 are arranged in at least three rows in the lateral force direction, as shown in FIG. They are arranged in a line with their mirror-finished joining end surfaces in contact with each other, and the joints (arrows (A)) between each rod-shaped glass substrate 7 have almost the same light refraction as that of the rod-shaped glass substrate 7. The bar-shaped glass substrates 7 are filled with a transparent adhesive of 100% or less, and each of the rod-shaped glass substrates 7 is bonded to each other by this adhesive. As this transparent adhesive, for example, there is a cyanoacrylate adhesive used as an instant adhesive, but an appropriate adhesive is selected in consideration of the optical refractive index of the rod-shaped glass substrate 7.

A liquid crystal 8 is sealed between the rod-shaped glass substrate @ 7 and the first lath plate 1, and a spacer 9 having an adhesive layer on one surface is interposed, and this spacer 9 allows the liquid crystal cell to be sealed. Controls the gap between electrodes. Note that the first glass substrate 1, ? JS2 glass base 2 base frame 2 plus board 7
The periphery or end of each is bonded to the frame 10 of the liquid crystal display element with an adhesive or the like.

To further explain the details of the rod-shaped glass substrate 7, the third
As shown in the figure, on the surface of the rod-shaped glass substrate 7 on the liquid crystal 8 side, there is one scanning electrode 11 to which a scanning signal voltage is applied in the length direction (horizontal direction) of the rod-shaped glass substrate 7, and for each pixel electrode column. Each pixel electrode 7 is connected to the scanning electrode 11 via a switching element 12 composed of, for example, a thin film diode (T F D ).

In the liquid crystal display element configured as described above, a predetermined voltage is sequentially applied as a scanning signal to the scanning electrodes 11 in the horizontal direction (in the direction of the rod-shaped glass substrate 7), and the counter electrodes 3 in the vertical direction function as signal lines. When a voltage corresponding to a video signal is applied to , a specific switching element 12 is selectively activated, and a predetermined voltage is created between the pixel electrode 6 connected to the activated switching element 12 and the corresponding opposing type +fj3. voltage is applied, the molecular arrangement of the liquid crystal changes during this time, and backlight light passes through the liquid crystal portion, thereby forming an image with the first glass substrate side as the display surface.

When displaying images as described above, the presence of the joints (arrows (a)) of each frame-shaped positive substrate 7 causes the backlight light (arrows (b)) to be scattered or reflected at these parts. This may be a contributing factor, but since this seam is filled with a substance (adhesive) that has the same optical refractive index as the rod-shaped positive substrate 7, the entire rod-shaped glass substrate group becomes as if it were a single plate. , scattering or reflection is greatly reduced, and backlight light passes through smoothly. Therefore, it is possible to prevent a linear shadow or a non-display part of a scattered image (scattered R rays) from appearing at the joint of the rod-shaped glass substrate 7 on the image display surface.

In addition, although the above-mentioned embodiment uses a domain diode (T F D ) as the switching element 12, a switching element using a thin film transistor (T F T') may also be used. When using thin film transistors,
The counter electrode formed on the side of the first plus substrate 1 is different from the striped electrode 3 shown in the figure, and is a full-surface electrode formed on the entire surface of the first plus substrate 1, and is used as a common electrode. Then, scanning electrodes and signal electrodes are formed in a matrix on the pixel type ff1G side.

In this case, the scanning electrodes are formed on the surface of the rod-shaped glass substrate 7 next to the liquid crystal 8; that is, the scanning electrodes are the same as the scanning electrodes 11 in FIG. 3).
, a structure in which a signal electrode orthogonal to this scanning electrode is formed on the inner surface (the surface on the rod-shaped glass substrate 7 side) of the tpJ2 glass substrate 2, or a signal electrode and a scanning electrode that are orthogonal to each other are both formed on the t52 glass substrate 7. Any structure formed on the inner surface of the in this case,! The connection between the signal electrode or scanning electrode formed on the surface of the 1S2ff positive substrate 2 and the pixel electrode or switching element formed on the surface of the rod-shaped positive substrate 7 next to the liquid crystal 8 is made by connecting the lead wire of the pixel electrode or switching element. Each rod is from the joint part (arrow (a)) of the lath board 7! ¥s2 glass substrate 2
This is done by connecting it to the (, ?) electrode or scanning electrode on the second FF substrate 2.

In the embodiment, three rows of pixel electrodes 6 are formed on one rod-shaped positive substrate, but the present invention is not limited to this, and the number of pixel electrodes 6 may be one, two, or three or more.

Furthermore, the present invention is also applicable to a simple matrix type liquid crystal display element that does not use switching elements.

[Effect of the Invention J As explained above, according to the present invention, the joint between the rod-shaped transparent substrates is filled with a transparent adhesive having almost the same optical refractive index as the rod-shaped transparent substrate. The scattering or reflection of the backlight is significantly reduced, and the appearance of linear shadows or scattering (non-display areas in 1 (hence !iL bright lines) at the seam on the image display surface) is prevented, and the image quality is improved. .

[Brief explanation of the drawing]

Figure tjS1 is a cross-sectional view of the main parts of a liquid crystal display element showing an embodiment of the present invention, Figure ttS2 is an overall front view corresponding to the direction shown by arrows ■-■ in Figure 1, and Figure 3 is a cross-sectional view corresponding to the direction shown by arrows ■-■ in Figure 1. It is an enlarged view of the main part as seen from the arrow. 1.2... Positive substrate, 3... Counter electrode, 6...
Pixel electrode, 7... rod-shaped positive substrate (rod-shaped transparent substrate),
8...Liquid crystal, arrow (a)...joint part. Applicant: NEC Home Electronics Co., Ltd. NEC Corporation

Claims (1)

[Claims] In a liquid crystal display device in which a group of pixel electrodes in a lattice arrangement is formed by arranging a large number of rod-shaped transparent substrates each having pixel electrodes arranged in a straight line in parallel, the rod-shaped transparent substrates are formed at the seams between the rod-shaped transparent substrates. A liquid crystal display element characterized by being filled with a transparent adhesive having an optical refractive index almost equal to that of the substrate.