JPS59204823A - Liquid crystal panel - Google Patents

Abstract

PURPOSE:To obtain a superlarge-sized liquid crystal panel whose field of view characteristics is improved, by providing an oriented film which has been rubbing-processed so that the upper half part and the lower half part become the lower side and the upper side, respectively, in the good field of view direction of the liquid crystal panel. CONSTITUTION:The lower half part of an upper substrate 5 is covered with a mask, rubbing- processed in the direction as indicated with an arrow A, and subsequently, only the lower half part is rubbing-processed in the direction as indicated with an arrow B. In the same way, only the upper half part of a lower substrate 5', and the lower half part are rubbing-processed in the direction as indicated with an arrow C, and in the direction as indicated with an arrow D, respectively. Corners (a), (b), (c) and (d) of the upper substrate 5 are combined opposingly with corners a', b', c' and d' of the lower substrate 5' so that they are placed on each other, and they are sealed by a sealing material 7, also a liquid crystal substance 8 is enclosed, by which a liquid crystal panel is prepared. This liquid crystal panel becomes a TN type liquid crystal panel of a left twist if a chiral substance of a left twist is added in advance to a liquid crystal substance, therefore, a good field of view bearing of the upper half part becomes a bearing of six o'clock, and the lower half part becomes a direction of 12 o'clock. Therefore, even when the whole liquid crystal panel is looked out over, the whole can be observed well at once.

Description

DETAILED DESCRIPTION OF THE INVENTION 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. In this TN type liquid crystal panel, two substrates coated with alignment films are subjected to a rubbing process in which the upper and lower substrates are rubbed with cotton cloth, chemical fiber, etc. in the directions of arrows 1 and 2, respectively, as shown in FIG. The two substrates are placed facing each other at a predetermined distance, and the liquid crystal material is sealed. By adding this uniquely twisted chiral substance to a liquid crystal substance, a 90° right-handed twisted TN type liquid crystal panel can be manufactured.

Note that it represents the twisting direction of the 6-poly liquid crystal molecules. The TN type liquid crystal panel has a narrow viewing angle characteristic, and the direction in which the display can be seen well, that is, 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 such as a wristwatch or clock, the display can be viewed from a fixed position, allowing sufficient observation and functioning as a display.

FIG. 2 is an explanatory diagram showing the ultra-large liquid crystal panel and the position of the observer's eyes. However, when observing an ultra-large liquid crystal panel from directly in front, for example, the best viewing direction is the most important.
As shown in figure 4, when the clock is oriented at 6 o'clock, the upper half is viewed from a good field of view direction and can be seen clearly, but the lower half is viewed from 12 o'clock direction and is very difficult to see. Hard to see. Therefore, it was necessary to move the head and move the eyes to a position where the patient could see clearly.

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 viewed at once.

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

Example 1 FIG. 3 is a sectional view of the structure of a liquid crystal panel according to the present invention. FIGS. 4(a) and 4(b) are plan views showing the rubbing direction of the upper and lower substrates, respectively. An alignment film 6.6' is applied to each substrate 5.5' on which a transparent electrode is formed in a predetermined shape.

First, the lower half of the upper substrate 5 is covered with a mask, only the upper half is rubbed in the direction of arrow A, and similarly only the lower half is rubbed in the direction of arrow B.

Similarly, only the upper half of the lower substrate 5' is rubbed in the direction of arrow C, and only the lower half is rubbed in the direction of arrow C. Corners a, b of the upper substrate 5,
c and d are the angles a', b', C' and d' of the substrate 5', respectively.
[Place them together so that they overlap and seal them with the sealing material 7.]

Furthermore, by enclosing a liquid crystal object 8, a liquid crystal panel as shown in FIG. 3 can be produced. If a left-handed chiral substance is added to the liquid crystal material in advance, the liquid crystal panel becomes a left-handed TN type liquid crystal panel, so the upper half has a good viewing direction of 6 o'clock, and the lower half has a 12 o'clock direction. The direction will be .

Therefore, even if you look around the entire liquid crystal panel, you can clearly observe the entirety at once.

Example 2 In the above example, only the direction of the rubbing process is shown in Fig. 5 (
A liquid crystal panel is similarly created by making the steps shown in a) and FIG. 5(b). A right-handed chiral substance is added to the liquid crystal substance injected at this time. In this way, as in Example 1, the good viewing direction of the upper half of the liquid crystal panel was at 6 o'clock, and the lower half was at 12 o'clock, so that the entire panel could be seen well at once.

As explained above, by specifying the rubbing direction and the twisting direction of the chiral substance, it is possible to provide an ultra-large liquid crystal panel that allows the entire panel to be clearly observed.

[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. FIG. 3 is a cross-sectional view showing the structure of the liquid crystal panel according to the present invention, FIG. 4 shows Example 1, and FIG. 5 shows Example 2, and the rubbing directions of the upper and lower substrates, respectively. FIG. 3... Right twist 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, B , E, F...Rubbing direction of the upper substrate, C,
D, G, H...Rubbing direction of the lower board.

Claims (1)

[Claims] An alignment film is provided on a substrate with transparent electrodes formed in a predetermined shape,
In a liquid crystal panel in which the alignment film is rubbed to align liquid crystal molecules, two substrates are placed facing each other at a predetermined interval, and a liquid crystal substance is filled in the interval, for the upper half of the liquid crystal panel: A rubbing process is applied so that the good viewing direction is on the lower side, like the so-called 6 o'clock direction on a clock, and for the lower half, the good view direction is on the upper side, like the so-called 12 o'clock direction. A liquid crystal panel comprising an alignment film comprising: