JPS61120121A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To improve the display quality by forming a glare shielding member on the surface of an upper polarizing plate by coating to avoid reflection from a display surface. CONSTITUTION:A nematic liq. crystal having a twisted structure is sealed in the space between a pair of upper and under light transmitting substrates 1, 2 having light transmitting electrodes on the confronting surfaces. Upper and under polarizing plates 7, 8 are placed on the outsides of the substrates 1, 2, and a glare shielding member 9 is formed on the surface of the upper polarizing plate 7 by coating silicone or urethane paint to about 1-3mum thickness. The paint contains a dispersed light diffusing material such as silica or calcium carbonate so as to diffuse light reflected from the surface of the polarizing plate 7. Since the glaring of the display surface and reflection from the surface are avoided, the display quality can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a liquid crystal display element, and particularly to a liquid crystal display element suitable for a large size with a large display area.

[Background of the invention]

FIG. 1 shows an example of a conventional liquid crystal display element. Two upper and lower light-transmitting substrates 1.2, each having a light-transmitting segment electrode 1a and a common electrode 2a formed on their opposing surfaces, are made to face each other and their peripheral parts are bonded together with a sealing material 3. A twisted nematic liquid crystal 4 having a twisted structure is sealed between the two. Furthermore, upper and lower polarizing plates 7.8 are fixed to the outer surfaces of the upper and lower translucent substrates 1.2 via translucent adhesive materials 5.6, respectively, to constitute a transmissive liquid crystal display element. Also, should a reflective plate be attached to the outer surface of the polarizing plate 8?

Alternatively, by using a reflective type for the lower polarizing plate 8, a reflective liquid crystal display element is constructed.

Incidentally, in large liquid crystal display elements, it is necessary to suppress reflections on the display surface, which were not a problem in small liquid crystal display elements, and to make the display easier to see. However, conventional liquid crystal display elements only have 1
No consideration has been given to preventing reflections on the display surface, so for example, if you use a large LCD display in a room with fluorescent lights on, the fluorescent lamp itself or a white shirt may be reflected on the display surface. , these had the disadvantage that they overlapped with the original display, making the display difficult to see.

[Purpose of the invention]

The purpose of the present invention is to prevent reflection on one display surface,
An object of the present invention is to provide a liquid crystal display element with high display quality.

[Summary of the invention]

In order to achieve the above object, the present invention has a nematic liquid crystal having an E-twisted structure between a pair of upper and lower transparent substrates having transparent electrodes on opposing surfaces, and a nematic liquid crystal having an E-twisted structure coated in front. It is characterized by

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. The same or equivalent portion as in Figure 1 is coated with a thickness of about 3 μm. It will be more effective if a light diffusing material such as silica or calcium carbonate is dispersed in the paint to diffuse surface reflection.

Figures 3 and 4 are polarizing plates with anti-scald coating coated with silicone paint on triacetic acid: 5, 1: i; 7.
Figure 3 shows the relationship between turbidity and transmittance, and Figure 4 shows the relationship between turbidity and surface reflectance. Here, the turbidity can be made to have various characteristic values by changing the amount of silica dispersed in the silicone paint. In the figure, O indicates the characteristic value when the amount of silica to be dispersed is changed, and the opening indicates the characteristic value of the first half of the retarder coat -^-→→. Transmittance is the ratio of the amount of transmitted light to the amount of incident light. Surface reflectance is based on J゛I8 standard Z8741.
It represents the ratio when the reflectance of black glass is set to 100.

As long as the transmittance is 35 inches or more, visibility is not a problem, so as is clear from FIG. 3, a turbidity in a very wide range of 47 inches or less satisfies the condition. However, the surface reflectance is preferably 90 to 100% in view of visibility and anti-inflammatory properties. From this point of view, as is clear from FIG. 4, the turbidity needs to be set in the range of 1 to 9 inches.

As shown, the turbidity is 0.4% and the surface reflectance is 120%, and although this itself does not have anti-bacterial properties, by coating the surface of the polarizing plate with a silicone paint containing silica dispersed, The turbidity can be adjusted from 1 to 9 inches, the transmittance is 42 inches, and the surface reflectance is 90 to 100%. , the display quality improves.

In the above embodiments, the plastic surface was coated with lζ silicon paint, but the same effect can be obtained by etching the plastic surface to make it uneven.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a liquid crystal display element with high display quality can be obtained since the upper side light ζ is coated with a blocking member.

[Brief explanation of the drawing]

1x1 diagram shows a conventional liquid crystal display element, (a) is a perspective view, (b) is a sectional view, FIG. FIG. 4 is a diagram showing the relationship between turbidity and surface reflectance. 1.2...Transparent substrate, 4...Liquid crystal, 7.
8...Polarizing plate, 9.--Screen prevention member. Figure 1(b) 2nd WJ

Claims (1)

[Claims] In a liquid crystal display element, a nematic liquid crystal having a twisted structure is sealed between a pair of upper and lower transparent substrates having transparent electrodes on opposing surfaces, and upper and lower polarizing plates are disposed on the outer surfaces of the transparent substrates, respectively. . A liquid crystal display device, characterized in that a shielding member is coated on the surface of the upper polarizing plate.