JP2000047179A - Liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability and accuracy of the temperature detected by a sensor and the productivity of an LCD. SOLUTION: In this liquid crystal display element, glass substrates 1, 2 are stuck to each other with liquid crystal between the edge part of the substrate 1 is protruded and extended longer than that of the substrate 2, an IC 3 for driving the liquid crystal is mounted on the internal face of the extended part 1a, the end part (called an extension end part) 1a1 of the extended part is connected to the end part 4a of a flexible substrate 4 for wiring via an anisotropic conductive film 5, a temperature sensor 6 is mounted on the extended part 1a or the flexible substrate 4, and a liquid crystal drive voltage is varied according to the temperature detected by the sensor. In this case, the temperature sensor 6 is mounted on the end part 4a of the flexible substrate connected to the extension end part 1a1 with a solder or a conductive adhesive, especially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a technology for mounting a temperature sensor for a liquid crystal display device.

[0002]

2. Description of the Related Art Generally, an optimum driving voltage of a liquid crystal display (LCD) changes depending on temperature. For this reason, a temperature sensor is attached so that the drive voltage can be changed according to the temperature. (1) A first example of a conventional mounting structure of a temperature sensor will be described with reference to FIG. Glass substrates 1 and 2 are bonded together with a liquid crystal (not shown) interposed therebetween. The end of the glass substrate 1 is protruded and extended from the glass substrate 2, and the extension 1
The liquid crystal driving IC 3 is mounted on the inner surface of the wiring board a, and the end 4 a of the wiring flexible substrate 4 is connected to the end of the extension 1 a (referred to as the extension end) by the anisotropic conductive film 5. . A temperature sensor 6 is mounted by soldering on the back surface (the glass substrate 1 side) of the extended end 4c which is separated from the end 4a and the slit 4b and further protrudes from the end 4a. The temperature sensor 6 is fixed to the inner surface of the extension 1 a of the glass substrate 1 with an adhesive 7. The other end of the flexible substrate 4 is provided with a connector portion 4d having electrodes (terminals) for connecting to the outside.

A drawback of the temperature sensor mounting structure of the LCD shown in FIG. 2 is that the bonded portion is easily peeled off due to a difference in the coefficient of thermal expansion between the temperature sensor 6 and the glass substrate 1 (if peeled off, it becomes difficult to measure the substrate temperature by the sensor). Or the reliability of the detected data may be problematic), and considerable work is required for bonding. (2) In the second example of the conventional temperature sensor mounting structure, as shown in FIG.
Is fixed to the inner surface of the temperature sensor 6 with an adhesive 7, and the electrodes formed on the other surface of the temperature sensor 6 and the flexible substrate 4 are connected to the conductive wires 8.
Connected with.

The disadvantages of the second example are, in addition to the above,
In addition, wiring man-hours using conductive wires are required. (3) In a third example of a conventional temperature sensor mounting structure, as shown in FIG. 4, a temperature sensor 6 is mounted on a flexible substrate 4. The disadvantage of this structure is that the temperature sensor 6 is not adhered to the glass substrate and the flexible substrate 4
This is a point that the measurement accuracy of the substrate temperature is poor because it is mounted at a place away from the upper glass substrate.

[0005]

SUMMARY OF THE INVENTION The present invention has the disadvantages of the prior art, namely, that the temperature sensor is easily separated from the bonding portion due to a temperature change, that the number of bonding steps is large,
In addition to improving the reliability and accuracy of the detection temperature, the LCD sensor solves the problem that the wiring man-hour by the conductive wire is required, and the measurement accuracy is poor because the temperature sensor is mounted away from the glass substrate. The aim is to improve productivity.

[0006]

(1) According to a first aspect of the present invention, two glass substrates are bonded together with a liquid crystal interposed therebetween, and the end of one of the glass substrates is protruded and extended from the other, and the extended portion is provided. A liquid crystal driving IC is mounted on the inner surface of the
An end of a flexible substrate for wiring is connected to an end of the extension (referred to as an extension end) by an anisotropic conductive film, and a temperature sensor is mounted on the extension or the flexible substrate. The present invention relates to a liquid crystal display device in which a liquid crystal driving voltage is changed according to a temperature. In particular, the temperature sensor is mounted on the end of the flexible substrate connected to the extended end of the glass substrate by solder or conductive adhesive.

[0007]

FIG. 1 shows an embodiment of the present invention, and FIG.
4 are denoted by the same reference numerals, and redundant description will be omitted. In the present invention, the temperature sensor 6 is mounted on the end 4a of the flexible substrate 4 connected to the extension end 1a1 of the glass substrate 1 by soldering or a conductive adhesive. As the temperature sensor 6, a thermistor, a thermocouple, or the like can be used.

[0008]

According to the present invention, since the adhesive 7 is not used for fixing the temperature sensor 6, it is a disadvantage of the prior art.
The point that the sensor is easily peeled off from the bonding portion due to the temperature change and the point that the number of steps of the bonding operation is large are automatically solved. Also, since the conductive wire 8 is not used to connect the sensor,
The point that the man-hour for wiring the conductive wire 8 is required is also solved. Further, since the sensor is soldered on the end portion 4a of the flexible substrate which is overlapped and joined on the extension end portion 1a1 of the glass substrate, the conventional sensor is mounted at a place away from the substrate. The point where the measurement accuracy is reduced is automatically resolved.

Therefore, according to the present invention, the reliability and accuracy of the temperature measurement can be improved, and the productivity of the LCD can be improved.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, wherein A is a front view, and B is
Is a plan view.

FIG. 2 is a diagram showing an example of a conventional LCD, wherein A is a front view,
B is a plan view.

FIG. 3 is a view showing another example of a conventional LCD, wherein A is a front view and B is a plan view.

FIG. 4 is a front view showing still another example of the conventional LCD.

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Claims (1)

[Claims] 1. A liquid crystal driving IC is mounted on an inner surface of one of the two glass substrates, the end of one of the glass substrates protruding and extending from the other. An end of the flexible board for wiring is connected to an end of the extension (referred to as an extension end) by an anisotropic conductive film, and a temperature sensor is mounted on the extension or the flexible board, and a temperature detected by the sensor is detected. In the liquid crystal display element adapted to change the liquid crystal drive voltage according to the above, the temperature sensor is mounted by solder or conductive adhesive on the end of the flexible substrate connected to the extended end of the glass substrate. A liquid crystal display device, comprising: