JPS62178926A - Liquid crystal display element provided with transparent switch - Google Patents

Abstract

PURPOSE:To suppress a variation of a cell gap in case an external force is applied to a substrate surface, and to prevent the generation of an uneven display contrast, by evading a display pattern, and providing a spacer using a sealing material, in a liquid crystal cell. CONSTITUTION:In a TN type liquid crystal display element which forms a transparent switch between the upper face of the upper substrate and the lower face of the upper polarizing plate 1, a spacer using a sealing material is provided in a liquid crystal cell, by evading a display pattern. The spacer using the sealing material, for preventing a variation of a cell gap is provided, for instance, in the same position and the same shape as a spacer provided on the transparent switch part, so as not to attract attention. A sealing material spacer 5 is all provided on an intermediate point of a transparent switch part spacer 2, to say notching of the inside of the liquid crystal cell under a transparent switch part push position 8. In such a way, the cell gap comes not to be varied by an external force in case the transparent switch is depressed and a vibration of the outside, therefore, the generation of an uneven display contrast is suppressed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a transparent switch with a transparent switch that does not cause adverse effects such as uneven display contrast on the quality of the liquid crystal display near the operating position even when the transparent switch is operated. Related to liquid crystal display elements.

[Conventional technology]

Conventionally, when vibration is applied to a large liquid crystal display element, such as when hitting a keyboard with a typewriter equipped with an liquid crystal display, the gap between the upper and lower substrates of the liquid crystal cell of the liquid crystal display element (hereinafter referred to as There was a problem in that the cell gear (abbreviated as "cell gear") changes vibrationally, resulting in uneven display contrast.

Similarly, even with a liquid crystal display element equipped with a transparent switch (so-called touch sensor), when the transparent switch is pressed, the pressure applied changes the liquid crystal cell gap at the bottom of the switch position, and as a result, the liquid crystal cell gap near the position where the switch is operated changes. A problem has arisen in which display contrast unevenness occurs.

Conventionally, as a means of cell gap control,
It has been practiced to place a spacer consisting of a short length of glass fiber with a diameter approximately equal to the cell gap.

However, although this spacer can ensure the minimum value of the cell gap, in general, in completed liquid crystal display elements, the dimension between the upper and lower substrates of the liquid crystal cell is somewhat larger than the spacer (as disclosed in Utility Model Application No. 54-99639). Publication), when external force is applied to the substrate, it is normal for the cell gap to change to some extent. The above problem arises because of this actual situation.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a liquid crystal display element with a transparent switch that solves the problem of the conventional element in that contrast unevenness occurs in the liquid crystal display near the switch operation position when the transparent switch is pressed. purpose.

[Means for solving problems]

In order to solve the above problems, in the present invention, a spacer using a sealing material is provided inside the liquid crystal cell, avoiding the display pattern.

The above-mentioned spacers using conventional glass fibers aim to maintain the minimum cell gap, but as mentioned above, they do not take into account the possibility that the cell gap may become slightly larger or smaller. There wasn't. On the other hand, if a sealing material is used as the spacer material, its placement position and shape can be freely determined using printing techniques.

However, since the liquid crystal is excluded where the spacer is present, black dots always appear in a normal reflective TN liquid crystal display. Therefore, the spacer for preventing cell gap fluctuation using this sealing material should be placed inconspicuously, for example, in the same position and shape as the spacer provided in the transparent switch part, or for the sake of design, it should be placed in a display etc. It must be arranged in such a way that it harmonizes well with the

[Effect]

As mentioned above, a spacer using a sealing material can be accurately placed in a desired position and shape by printing techniques, etc.
In addition, since the material is a sealing material, it is reliably adhered to the upper and lower substrates, suppressing fluctuations in the cell gap when external force is applied to the substrate surface, and preventing uneven display contrast.

Further, as will be seen in the examples described later, the spacers using the sealing material are arranged at small intervals (half the interval between the transparent switch part spacers) and are arranged in large numbers, so the effect is large.

〔Example〕

FIG. 1(a) is a side sectional view of one embodiment of the present invention, in which 1 is an upper polarizing plate, 2 is a transparent switch part spacer, 3 is an upper substrate, 4 is a sealing material around the liquid crystal cell, and 5 is the present invention. 6 is a glass fiber spacer, and 7 is a lower substrate.

In this embodiment, a sealing material spacer 5 is provided within the liquid crystal cell at the same position as the transparent switch part spacer 2 and at an intermediate point between them.

FIG. 1(b) is a top view of the same embodiment, in which numeral 8 indicates the push position of the transparent switch part, and other symbols are the same as in FIG. 1(a). The sealing material spacer 5 is, as shown in FIG.
They are all arranged not only in the liquid crystal cell below the transparent switch pressing position 8 but also at the midpoint of the transparent switch spacers 2 (the installation interval between the sealing material spacers 5 is half the installation interval of the transparent switch part spacers 2). ), which should be visible in this figure as a black dot, but it is omitted because it would complicate the figure.

〔Effect of the invention〕

As described above, according to the present invention, the cell gap does not change due to external force or external vibration when the transparent switch is pressed, so that the occurrence of display contrast unevenness is suppressed.

[Brief explanation of drawings]

FIG. 1(a) is a side sectional view of one embodiment of the present invention, FIG. 1(b)
) is a top view of the same embodiment, and FIG. 2 is an explanatory diagram of the arrangement position of the spacer in the same embodiment.

Claims (1)

[Claims] 1. In a TN type liquid crystal display element in which a transparent switch is formed between the upper surface of the upper substrate and the lower surface of the upper polarizing plate, a spacer using a sealing material is placed inside the liquid crystal cell to avoid the display pattern. A liquid crystal display element with a transparent switch.