JPH01188894A - Liquid crystal element - Google Patents

Abstract

PURPOSE:To eliminate the emboss of a picture and to attain the long life of an EL lamp by directly providing an EL (electro luminescence) light emitting layer at the rear surface of a liquid crystal panel and coating the EL lamp with the material of a high moisture resistance. CONSTITUTION:An EL lamp 12 is directly provided at the rear surface of a transmission type liquid crystal panel 11 and at the circumference, a rear surface sealing glass 10 is formed in place of a protecting film. Thus, by providing directly an EL light emitting layer 12 at the rear surface of the liquid crystal panel 11, the interval between the displaying picture and the light emitting part can be shortened, and therefore, the emboss of the picture can be prevented. By coating the circumference of the EL light emitting layer 12 with a moisture resistance material 10, the bad influence due to the water is eliminated and the life of the EL light emitting layer 12 can be improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention uses EL (electr) as a backlight.

The present invention relates to a liquid crystal device using a light emitting layer (luminescence).

[Summary of the Disclosure] This specification and drawings describe a liquid crystal element using an EL light emitting layer as a backlight, in which the EL light emitting layer is directly integrated with the back surface of the liquid crystal panel, and the EL light emitting layer is surrounded by a moisture-resistant material. By covering it, there is no raised image, and E
This invention discloses a technique for producing a liquid crystal element with a long life of the L-emitting layer.

[Prior Art] Conventionally, incandescent light bulbs, hot eyelid discharge tubes, cold cathode discharge tubes, EL lamps, and the like have been used for backlighting liquid crystal devices.

Among the illumination types listed in L, the use of an EL lamp has the advantage that the structure of the liquid crystal element can be simplified and the uniformity of light emission can be improved.

FIG. 3 is a block diagram of a conventional liquid crystal element. In the figure, a transmissive liquid crystal panel 31 includes glass substrates 2a and 2b.
), transparent electrodes 5a and 5b formed on the spacer 4 that defines the liquid crystal 3 and the cell cap sandwiched inside.
Polarizing plates 1a and lb are arranged on both sides.

The EL lamp 32, which is an EL light emitting layer, is composed of a light emitting layer 6 and an insulating layer 7 sandwiched between a transparent electrode 5c and a back electrode 9, and a protective film 8 is formed around the EL lamp 32. .

In a conventional liquid crystal element, a transmissive liquid crystal panel 11 having the above structure and an EL clamp 2 are arranged at a predetermined interval.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional examples, the 'F and L lamps are generally covered with a transparent protective film and have an independent shape, and therefore have the following drawbacks.

1. Because there is a distance between the image displayed on the liquid crystal panel and the EL clamp, the displayed image appears to be floating.

2. The life of the EL clamp will be shortened if it contains moisture, but since there is currently no material that is completely waterproof as a protective film, the brightness of the EL clamp will deteriorate quickly if only the protective film is used.

The present invention has been made to eliminate the drawbacks of the above-mentioned conventional examples, and an object of the present invention is to provide a liquid crystal element that does not cause image floating and has a long EL clamp life.

[Means for Solving the Problems] The means taken to solve the problem L will be explained using the chopstick 1 diagram corresponding to the embodiment.The liquid crystal element according to the present invention uses an EL lamp 12 as a backlight In the liquid crystal element using the transmissive liquid crystal panel 11, an EL lamp 12 is placed directly on the rear glass part of the transmissive liquid crystal panel 11.
and EL lamp 12 are integrally formed, and the EL lamp 12 is integrally formed with the EL lamp 12.
The clamp 2 is characterized in that the periphery of the clamp 2 is covered with a moisture-resistant material such as a back sealing glass 10.

The moisture-resistant material used in the present invention includes glass, metal, etc., but other materials may be used as long as they can function equally well.

[Function] By providing an EL light-emitting layer directly on the back of the liquid crystal panel, the distance between one displayed image and the light-emitting part can be shortened.
It is possible to prevent the image from floating. Furthermore, by covering the EL layer with a moisture-resistant material, it is possible to eliminate the adverse effects of moisture and improve the life of the EL layer. Furthermore, in the liquid crystal element according to the present invention, since the liquid crystal panel and the EL light-emitting layer are integrally formed, the weight does not increase compared to the case where the protective film for the EL light-emitting layer in the conventional example is made of glass. Furthermore, since the structure can be simplified, handling becomes easier than when a liquid crystal panel and an EL light emitting layer are combined separately.

[Example] FIG. 1 is a configuration diagram showing an example of a liquid crystal element according to the present invention. In FIG. 1, an EL lamp 12 is provided directly on the back side of a transmissive liquid crystal panel 11, and a back sealing glass lO is formed around it instead of a protective film. The other configurations are similar to the liquid crystal element shown in FIG. 3, and the same reference numerals indicate equivalent parts.

According to the above configuration, since the EL lamp 12 is provided as a part of the liquid crystal panel 11, the structure can be simplified, and there is no need to consider how to handle the EL lamp separately, and it can be integrated into the liquid crystal display. Since it can be incorporated, it can also be easily handled. In addition, the EL lamp 12
The EL is surrounded by highly moisture-resistant glass.
Clamp life can be significantly improved. moreover,
Since the distance between the display section and the light emitting section is about the width of one sheet of glass, letters etc. do not appear raised.

FIG. 2 is a block diagram showing another embodiment of the present invention. In this embodiment, in an EL lamp 22 provided on the back side of a transmission type liquid crystal lamp 21, the back electrode 9 is configured to also serve as a back sealing glass. The other configurations are exactly the same as those of the embodiment described above.

In this configuration, by using a moisture-resistant metal such as aluminum for the back electrode 9, the back sealing glass can be made unnecessary. Therefore, since glass that requires special processing is not used, it is possible to reduce costs and weight.

[Effects of the Invention] As described above, by providing an EL light-emitting layer directly on the back surface of a liquid crystal panel, the distance between one displayed image and the light-emitting section can be shortened, so that floating of one image can be prevented. Furthermore, since the EL clamp is coated with a highly moisture-resistant material such as glass or metal, the longevity of the EL lamp can be further improved.

[Brief explanation of the drawing]

1 and 2 are diagrams showing an embodiment of the present invention, and FIG. 3 is a diagram showing a conventional example. 8... Protective film 9... Back electrode lO... Back sealing glass 11.21.31... Transmissive liquid crystal panel 12.22.
32...EL clamp applicant Canon Co., Ltd.

Claims (1)

[Claims] (1) In a liquid crystal element using an EL light emitting layer as a backlight, the EL light emitting layer is placed directly on the back glass part of the liquid crystal panel, the liquid crystal panel and the EL light emitting layer are integrally formed, and the area around the EL light emitting layer is A liquid crystal element characterized by being coated with a moisture-resistant material.