JPS59204824A - Liquid crystal panel - Google Patents

Abstract

PURPOSE:To obtain a superlarge-sized liquid crystal panel whose field of view characteristics is improved, by executing the rubbing processing of the upper and the lower substrates by rotating them in the shape of a concentric circle from each different rotation center. CONSTITUTION:Oriented films 6, 6' are applied to two substrates 5, 5' on which a transparent electrode film of a prescribed shape is formed, respectively. The upper substrate 5 is rubbing-processed in the shape of a concentric circle in the direction as indicated with an arrow by using a cotton cloth or a chemical fiber centering around a revolving shaft A, and in the same way, the lower substrate 5' is rubbing-processed in the shape of a concentric circle in the direction as indicated with an arrow centering around a revolving shaft B. Thereafter, coroner parts (a), (b), (c) and (d) of the upper substrate 5 are combined opposingly with corner parts a', b', c' and d' of the substrate 5' so that they are placed on each other, and they are sealed by a sealing material 7, and a liquid crystal substance 8 is enclosed, by which a liquid crystal panel is prepared.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultra-large liquid crystal panel with improved viewing characteristics. More specifically, the rubbing process is performed so that the good viewing direction of the liquid crystal panel is on the lower side in the upper half, and on the upper side in the opposite direction to the upper half in the lower half.

A commonly used liquid crystal panel is a 90° twisted TN type. FIG. 1 is a plan view showing the rubbing direction of the upper and lower substrates of a conventional liquid crystal panel. This TN type liquid crystal panel 10 has two layers coated with an alignment film.
For example, as shown in FIG. 1, the upper and lower substrates are rubbed with cotton cloth or chemical fiber in the directions of arrows 1 and 2, respectively. The two substrates are placed facing each other at a predetermined distance, and the liquid crystal material is sealed therein. When a chiral material with this unique twist is added to a liquid crystal material, it becomes possible to
'Twisted TN type LCD panels can be manufactured.

Note that 6 represents the twisting direction of the liquid crystal molecules. The TN type liquid crystal panel has narrow viewing angle characteristics, and the direction in which the display can be seen clearly is
In other words, the good viewing direction 4 is limited to the direction indicated by the arrow.

Note that this good viewing direction can be limited by specifying the rubbing direction of the upper and lower substrates and the twisting direction of the chiral substance. When this liquid crystal panel is used for a small display device such as a wristwatch or a clock, the display can be viewed from a fixed position, allowing sufficient observation and functioning as a display device.

FIG. 2 is an explanatory diagram showing the super large panel and the position of the observer's eyes. However, when observing an ultra-large LCD panel from the front, for example, if the good viewing direction is the so-called 6 o'clock direction as shown by 4 in Figure 1, the upper half cannot be viewed from the good viewing direction. It looks good, but the lower half is very difficult to see because it has to be observed from the 12 o'clock direction. Therefore, it was necessary to move the head and move the eyes to a position where they could see better.

As described above, in the case of an ultra-large panel, a normal 90° twisted TN type liquid crystal panel cannot be observed in its entirety at once.

An object of the present invention is to provide an ultra-large liquid crystal panel with improved viewing characteristics so that the entire panel can be observed well at once.

Embodiments of the present invention will be described below based on the drawings.

FIG. 3 is a sectional view of the structure of the liquid crystal panel according to the present invention, and FIGS. 4(a) and 4(b) are plan views showing the rubbing direction of the upper and lower substrates. Alignment films 6 and 6' are respectively applied to two substrates 5 and 5' on which transparent electrode films of predetermined shapes are formed. Then, the substrate 5 is subjected to a rubbing treatment concentrically in the direction of the arrow using cotton cloth or chemical fiber around the rotation axis A. Similarly, the lower substrate 5' is rubbed concentrically in the direction of the arrow with the rotation axis B as the center. After that, the corners a-b-c-d of the substrate 5 are respectively changed to the corners a' of the substrate 5'.
Ab', C', and d' are assembled facing each other so as to overlap, and sealed with a sea/' material 7. At this time, if the inherent chiral pinch of the chiral liquid crystal substance is p, then the distance d at the center of the liquid crystal panel 10 is. is almost completed, lower board 5
The distance d1 from one side b-d of the upper substrate 5 at one side '-d' of '' is O<d+<H, and the distance d2 from a-c at the other side a'-c' is '<d2 <The spacing between the upper and lower substrates is controlled so that p.

Then, a liquid crystal channel can be produced by sealing with a sealing material 7 and sealing a liquid crystal substance 8. At this time, if a left-handed chiral substance is added to the liquid crystal material, a left-handed TN type liquid crystal channel will be obtained.

FIG. 5 is a plan view showing the direction of the rubbing process at each location of the liquid crystal display according to the present invention. As shown in FIG. 5, the relative relationship between the rubbing treatment and placement directions of the upper and lower substrates differs depending on the individual locations. The liquid crystal molecules arranged at the three locations at the bottom of FIG. 5 have a so-called 90[deg.] twisted structure along sides b'-d'. The good viewing direction of this molecular arrangement is the 12 o'clock direction of the clock upwards.

Also, the liquid crystal molecule arrangement at the top three locations in Figure 5 is along sides a'-c.
', which is a so-called 270° twisted structure. The good field of view and orientation of this molecular arrangement is downward, the so-called 6 o'clock direction. Note that the three locations in the middle have a parallel structure.

As described above, the good viewing direction of the ultra-large liquid crystal panel according to the present invention is the 6 o'clock direction at the top and the 12 o'clock direction at the bottom, so the entire screen can be viewed at once. be.

Note that in the above embodiments, the rotational direction of the rubbing treatment and the twisting direction of the chiral substance are limited, but the present invention is not limited to these embodiments.
Type liquid crystal) channels are also included in the present invention.

[Brief explanation of drawings]

Figure 1 is a plan view showing the relationship between the rubbing direction of the upper and lower substrates, the twisting direction of liquid crystal molecules, and the good viewing direction in a conventional liquid crystal panel, and Figure 2 shows the ultra-large liquid crystal panel and the observer's eye. An explanatory diagram showing the position of
The figures show an embodiment according to the present invention, Fig. 3 is a cross-sectional view showing the structure of the liquid crystal channel, Fig. 4 is a plan view showing the rubbing direction of the upper and lower substrates, and Fig. 5 is the liquid crystal channel. FIG. 3 is a plan view showing the relationship between the rubbing directions of the upper substrate and the lower substrate at each location of the panel. 1... Rubbing direction of the upper board, 2...
Rubbing direction of lower substrate, 6... Twisting direction of liquid crystal molecules, 4... Good viewing direction, 5... Upper substrate, 5... Lower substrate, 6.6. ...Alignment film, 10...Super large liquid crystal panel, A...Rotation center of rubbing of upper substrate, B...
・Rotation center for rubbing of the lower board. Figure 1-4 Figure 2 Figure 5

Claims (1)

[Claims] An alignment film is provided on a substrate on which a transparent electrode is formed in a predetermined shape, and a rubbing process is performed to orient the liquid crystal molecules.The two substrates are placed facing each other at a predetermined interval, and a chiral film with a specific pitch of p is formed between the two substrates. In a liquid crystal panel that is filled with a liquid crystal substance that has properties, the rubbing process for the upper and lower substrates is performed by concentric rotation, and the centers of rotation for the rubbing process for the upper and lower substrates are not at the same position but at different locations. , and on a line perpendicular to a line connecting the centers of rotation of the respective rubbings of the upper and lower substrates on the liquid crystal panel surface, the upper and lower substrates are larger than 100 mm on the other hand.