JPH0529458Y2 - - Google Patents

Description

[Detailed explanation of the idea] [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 devices (hereinafter referred to as LCD) have
Its features of low power consumption, weight, and thin design are attracting attention, and its application fields are expanding. For example, its applications are expanding from the display parts of wristwatches and calculators to large LCDs, which have a display capacity comparable to that of color cathode ray tubes. Large LCD like this
Now, color cathode ray tubes are being applied to display areas such as word processors and computer terminals. However, it has been pointed out that the LCDs used in these display areas have drawbacks in that external light is reflected on the LCD surface, making the LCD display blurry, and the operator's image is reflected on the LCD surface, making it very difficult to see. Also,
LCDs usually have a polarizing plate attached to their surface, but since this polarizing plate is generally made of a resin plate that is easily damaged, the polarizing plate gets damaged when the operator works, making it difficult to see the LCD display. Other shortcomings were also pointed out.

A method to avoid the above-mentioned drawbacks is generally to fix an anti-reflection treated glass substrate to the front surface of the LCD. Next, a specific example of this method will be explained.

(1) The first method is to use double-sided adhesive tape or the like to fix a glass substrate on part or all of the display area of the LCD.

(2) The second method involves interposing an adhesive between the display part of the LCD and the glass substrate to firmly fix it.

However, the present inventors have confirmed that the following drawbacks occur when these methods are used.

When using the first method, the reliability of the adhesive strength of double-sided adhesive tape, etc. is extremely poor, and it also
There is a risk of creating a gap between it and the display part of the LCD. Therefore, not only does the anti-reflection effect of the glass plate decrease, but there is always a risk that the glass substrate will break if external force is inadvertently applied. In addition, if double-sided adhesive tape is pasted on the entire surface of the LCD display area, the reliability of the adhesive strength can be sufficiently ensured, but there is a risk that the light transmittance will deteriorate when viewing the LCD display area due to the double-sided adhesive tape, etc. be.

When using the second method, the adhesive strength can be made sufficiently strong by selecting an appropriate material. However, when a sudden force is applied to the attached glass substrate, there is a risk that the glass substrate will break and scatter. Moreover, when the adhesive layer hardens very strongly, there is no room for the adhesive layer to absorb the sudden force, so the sudden force is applied to the LCD, and there is a high risk of destroying the LCD itself.
Further, when filling the adhesive, it is technically very difficult to fill the adhesive to the exact size of the glass substrate. For example, when a thermosetting adhesive (silicone type) is used, it is extremely difficult to prevent the adhesive from overflowing due to the size of the glass substrate. Therefore, it is extremely inconvenient to attach the glass plate to the glass plate, and the problem arises in the manufacturing process that the overflowing adhesive must be disposed of.

[Purpose of invention]

In view of the above-mentioned problems, an object of the present invention is to provide a highly reliable liquid crystal display device with a non-reflection treated substrate.

[Summary of the idea]

In order to achieve the above object, the liquid crystal display device of the present invention has a liquid crystal display and an anti-reflection substrate bonded together using a rubber elastic adhesive material. Thereby, the anti-reflection substrate and the liquid crystal display can be firmly fixed without impairing the anti-reflection function of the anti-reflection substrate.

[Example of idea]

Embodiments of the liquid crystal display device of the present invention will be described below with reference to the drawings.

A liquid crystal display device 1 shown in FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention. In FIG. 1, a liquid crystal display 5 is constructed by attaching a polarizing plate 4 and a reflecting plate 3 to the front and back sides of a liquid crystal cell 2. On this polarizing plate 4, an anaerobic photosensitive resin adhesive layer, for example, an acrylic adhesive layer 6 is interposed, and an antireflection substrate, for example, a glass substrate 7 that has been subjected to antireflection treatment, is fixed. This acrylic adhesive layer 6 does not harden when exposed to air, but simply hardens with ultraviolet light.
In addition, since the refractive index is very close to that of the glass substrate 7, reflection on the inside of the glass substrate 7 can be ignored, and slight scratches on the inside of the glass substrate 7 can be ignored. As a result, the glass substrate 7 and the polarizing plate 4
It can be firmly fixed by adhering to it.

As explained above, in the liquid crystal display device 1 shown in FIG. 1, the glass substrate 7 and the liquid crystal display 5 can be firmly fixed together without impairing the antireflection function of the glass substrate 7. Furthermore, since the acrylic adhesive layer 6 is made of a rubber elastic adhesive, it can absorb external force.

Furthermore, in FIG. 1, a spacer 12 made of, for example, resin and having a refractive index substantially the same as that of the glass substrate 7 is interposed in the acrylic adhesive layer 6 at the periphery of the glass substrate 7. As shown in FIG. This spacer 12
Not only is it visually unnoticeable, but also the thickness of the acrylic adhesive layer 6 can be controlled. Therefore, by using this spacer 12 to change the thickness, etc. of the acrylic adhesive layer 6, the adhesive strength and rubber elasticity can be changed. Therefore, this liquid crystal display device 1 can be designed according to the place of use.

[Effect of idea]

The liquid crystal display device of the present invention having the above-mentioned configuration has the following features:
The reliability of a liquid crystal display device with an antireflection substrate can be dramatically improved, and the manufacturing process can be significantly simplified.

That is, to be more specific, the liquid crystal display device of the present invention has a liquid crystal display device and a glass substrate that has been subjected to anti-reflection treatment on one of its surfaces.In other words, a glass substrate that has not undergone anti-reflection treatment is placed on the inside. An anaerobic photosensitive resin having rubber elasticity is interposed as an adhesive layer during curing. Further, in order to adjust the gap between the adhesive layers, a spacer or the like may be used.

With the above configuration, an adhesive layer with sufficient rubber elasticity can be absorbed between the liquid crystal display and the glass substrate.
This prevents the adhesive layer from separating and the glass substrate from scattering. Moreover, since the adhesive layer is made of a photosensitive resin, it can be cured with a suitable chemical lamp. Therefore. Even if the adhesive layer protrudes from a desired area, since the adhesive layer is anaerobic, the protruding area will not be cured and can be easily removed.
As a result, the liquid crystal display device of the present invention can maintain sufficient adhesive strength between the liquid crystal display device and the glass substrate, in other words, in the adhesive layer that is not exposed to air.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of the liquid crystal display device of the present invention. 1...Liquid crystal display device, 2...Liquid crystal cell, 3...
Reflector plate, 4...Polarizing plate, 5...Liquid crystal display, 6...
...Acrylic adhesive layer (rubber elastic adhesive), 7...
...Glass substrate (anti-reflection substrate).

Claims (1)

[Scope of utility model registration request] In a liquid crystal display device comprising at least a liquid crystal display and an anti-reflection substrate adhered to the front surface of the liquid crystal display, the liquid crystal display and the anti-reflection substrate are connected to each other via a spacer and are made of an anaerobic and photosensitive resin. A liquid crystal display device characterized in that it is bonded using a rubber elastic adhesive substance.