JPS5960421A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To lower thermal conduction to the outside air and to reduce variations in responsibility and display contrast characteristics with temperature by enclosing a liquid crystal display element in a vacuum container and insulating the outside air. CONSTITUTION:Horizontally oriented layers 5 and 6 are provided on glass substrates 3 and 4 where display electrodes 1 and 2 are formed, and then the substrates are rubbed; and thermosetting epoxy resin adhesive 7 is coated to sealed parts of those electrode substrates by screen printing and the substrates are stuck together and cured at 120 deg.C in one hour to obtain a liquid crystal container. Then, the resistor film 8 of a heater is provided on the reverse surface of the substrate 4 and a liquid crystal layer 9 is injected into the container. Respective display electrode terminals of this liquid crystal display element and a coupling pin 10 at a heater terminal part are fitted. The display element is enclosed in the container 11 consisting of transparent acryl plates 111 and 112 by using thermosetting epoxy resin adhesives 12 in such a state than the part of the pin 10 is clamped, and the container is evacuated and sealed.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a liquid crystal display device.

[Technical background of the invention and its problems]

In recent years, liquid crystal display elements have been widely used as display elements in games, quads, terminals, automobiles, etc. Liquid crystal display elements are used under various conditions. for example,
Liquid crystal display elements installed in cars can be used both in cold regions and on midsummer days, so operating temperature conditions are required to range from -30'C to +85°C.

By the way, in a liquid crystal display element, the responsiveness of the liquid crystal is generally slow at low temperatures, and although the response speed increases at high temperatures, the display contrast decreases and the display becomes difficult to see. There is a drawback. One possible way to eliminate these drawbacks is to install a heater on the low temperature side to reduce the delay in response speed, but if the heat is not sufficiently transferred to the liquid crystal display element due to thermal diffusion etc., and heating time is required, the Power consumption increases. Very few countermeasures on the high temperature side have yet been considered. When used as a car meter display, errors due to a delay in meter display at low temperatures and poor visibility due to a decrease in display contrast at high temperatures are serious problems because they lead to a lack of safety.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid crystal display device that can ensure stable display operation over a wide temperature range.

[Summary of the invention]

The present invention is characterized in that a liquid crystal display element is enclosed in a vacuum container. The pressure inside the vacuum container of the liquid crystal display device according to the present invention ranges from 50 Torr to 0.0 Torr. OITcyrr range is preferred. At 50 Torr or more, the thermal conductivity becomes good and is easily affected by temperature changes in the outside world. Below OI Torr, the container is likely to be damaged.
This is because heat loss due to thermal radiation also becomes large. Furthermore, by providing a heater in the liquid crystal display element, the effect at low temperatures becomes more significant.

〔Effect of the invention〕

According to present invention C, the liquid crystal display element is sealed in a vacuum container (2) to shut off the outside temperature (2) and at low temperature (2), heat transfer is 5 to 15 times slower than in the past, Similar results can be obtained even when the temperature changes, and changes in the responsiveness 1 display contrast characteristics of the liquid crystal display element due to temperature changes are reduced.Furthermore, when using a heater at low temperatures, there is less heat radiation, so it is set at a subtemperature. The power consumption for this can also be reduced from V6 to X6.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a sectional view showing the overall structure of a liquid crystal display panel, and Figure 2 (a
1 and (b) are front and back views of the display element. Glass substrates 3 and 4C on which display electrodes 1 and 2 are formed, respectively.Horizontal alignment layers 5 and 6 are formed using a horizontal alignment agent (F-2480゜Shin-Etsu Chemical).
After applying the thermosetting epoxy resin adhesive 7 to the sealing parts of these electrode substrates by two-way printing, the adhesive was bonded to 120°C and cured at 2°C for 1 hour to form a liquid crystal container. On the back surface C2 of one glass substrate 4, a resistor film 8 is formed in advance as a heater.
-1565 (manufactured by Merck & Co.) was injected. Connector pins 10 were attached to each display electrode terminal and heater terminal portion of this liquid crystal display element. Then, this display element is enclosed in a container 11C made of transparent acrylic plates 11, 11C, with the connector pins 10 held in place using a double thermosetting poxy resin adhesive 12, and the inside is evacuated. Sealed.

As a result of measuring changes in response characteristics (1) display characteristics by applying external temperature changes to a liquid crystal display panel configured in this way (2), it was found that the changes were much slower than before. (As a result of two energizations, the desired response characteristics were achieved in a short period of time.

In the present invention (-), it goes without saying that the electrode substrate and vacuum container of the liquid crystal display element should be transparent at least on the display surface side.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the configuration of an embodiment of the present invention, and FIG. 2 (al and (bl) are the front and back views of the liquid crystal display element, respectively. 1.2...Display electrode, 3, 4... Glass substrate. 5.6... Orientation layer, 7.12... Adhesive, 8...
Resistor film (heater), 9... Liquid crystal layer, 10... Connector pin + IICII, 112)... Acrylic container (vacuum container).

Claims (2)

[Claims] (1) Liquid crystal display device characterized in that the liquid crystal display element is sealed in a vacuum container (2) (2) The liquid crystal display device according to claim 1, wherein the degree of vacuum in the vacuum container is in the range of 50 Tarr to 0, OI Torr. (31iiJ) The liquid crystal display device according to claim 1, wherein the liquid crystal display element C is provided with a heater.