JPH03287126A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent the thickness of the device from increasing by using an EL, which is covered with a liquid crystal panel composed of a couple of substrate across a sandwiched liquid crystal layer and a protection film, as a light source, and forming this protection film of the material of at least polarizing plates or a phase difference plate. CONSTITUTION:The liquid crystal panel 10 consists of the couple of substrates between which the liquid crystal layer is held there between and the electroluminescence (EL) 102, the protection film 102 of the EL, and polarizing plates 104 and 105 are provided; and the polarizing plate 104 are provided on the liquid crystal panel 101 and the polarizing plate 105 is provided on the EL 102 and serves as the protection film of the EL 102 is eliminated and the liquid crystal display device is therefore made thin; and the EL 102 and polarizing plates 104 are provided in contact with each other to eliminate the leakage of light.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a liquid crystal display device. In particular, it relates to making liquid crystal display devices thinner.

[Prior Art 1 The structure of a liquid crystal display device according to the conventional technique t+tj is shown in FIG. FIG. 3 is a sectional view showing the structure of a conventional liquid crystal display device. In the figure, 101 is a liquid crystal panel, which is composed of a pair of substrates sandwiching a liquid crystal layer.

102 is an electroluminescence (hereinafter abbreviated as EL); 103 is a protective film for EL102;
It is formed on both sides of 2. Polarizing plates 104 are provided on both sides of the liquid crystal panel 101. One surface of each polarizing plate 104 is in close contact with the liquid crystal panel 101.

Then, the retardation plate is connected to the liquid crystal panel 101 and one polarizing plate 1.
In some cases, it is formed between 04 and 04.

Here, the protective film 103 covering the EL 102 is simply made of a transparent material such as polyester.

It had the above structure.

[Problems to be Solved by the Invention] However, in the configuration of the liquid crystal display device of the conventional technology, the thickness of the device increases by the EL protective film, and the thin feature of the liquid crystal display device is lost. Ta.

The present invention solves this problem, and aims to prevent the thickness of the device from increasing due to the protective film, and to provide a thin liquid crystal display device.

[Means for Solving the Problems] That is, the liquid crystal display device of the present invention is a liquid crystal display device that uses electroluminescence as a light source and is covered with a protective film and a liquid crystal panel consisting of a pair of substrates sandwiching a liquid crystal layer. , the protective film is formed of at least one of a polarizing plate and a retardation plate.

[Example] The present invention will be explained using an example. FIG. 1 is a sectional view showing the structure of the liquid crystal display device of this embodiment.

In the figure, 101 is a liquid crystal panel, which is composed of a pair of substrates sandwiching a liquid crystal layer.

102 is an EL, and 103 is a protective film for the EL. 104
．． 105 is a polarizing plate, and the polarizing plate 104 is the liquid crystal panel 101
The polarizing plate 105 is provided on the EL′ 102 and also serves as a protective film for the EL′ 102 .

With the above configuration, the protective film of ELIO2 is unnecessary, and the liquid crystal display device can be made thinner by that amount. Furthermore, by bringing the EL 102 into close contact with the polarizing plate 104, light leakage is reduced, and the brightness of the display is further increased.

Furthermore, a similar effect could be obtained by forming a retardation plate for optically correcting the colored display of the liquid crystal panel 101 on the polarizing plate 105.

Here, further different effects can be obtained by using a polarizing plate or a polarizing plate and a retardation plate as the protective film of the EL. This will be explained using FIG. In the same figure, 10
1 to 105 are the same as in FIG. 1, so the same numbers are given and explanations are omitted. 201 is a polarizing plate, and the angle of the polarization axis is different from that of the polarizing plate 105. 202 is a reflecting plate.

Here, when viewing the display on the liquid crystal panel 101, in a so-called transmission mode, in which light is applied from below the liquid crystal panel 101, a polarizing plate 105 is used to obtain the optimum contrast.
The angle of the polarization axis is set. And LCD panel 1
When viewing the 01 display, the angle of the polarization axis of the polarizing plate 201 is set so that optimal contrast can be obtained in the so-called reflection mode, in which light is shined from above and reflected by the reflective plate below. .

With the above configuration, when displaying by emitting light from the EL 102, the angle of the polarization axis of the polarizing plate 105 is set such that optimum contrast can be obtained in the transmission mode. The display has optimal contrast. The EL 102 also includes a protective film 103 and a polarizing plate 105. > is omitted and used in reflective mode, the angle of the polarization axis of the polarizing plate 201 is set such that optimal contrast can be obtained in reflective mode, so display in reflective mode can obtain optimal contrast. Like this E
By integrating the protective film of L with a polarizing plate, E
When switching the display mode between reflection and transmission mode by inserting and removing the L, it is now possible to display with optimal contrast in either mode. Of course, it goes without saying that the same effect can be obtained by providing the polarizing plate 201 shown in FIG.

It goes without saying that all modes such as TN type, STN type, two-layer STN type, etc. can be applied to the liquid crystal panel.

[Effects of the Invention] As described above, by forming the EL protective film with at least 61 polarizing plates and retardation plates, the EL protective film can be omitted, and the liquid crystal display device can be improved accordingly. This made it possible to reduce the thickness of the device and provide a thinner device.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a sectional view showing the structure of a liquid crystal display device according to another embodiment of the present invention. FIG. 3 is a sectional view showing the structure of a conventional liquid crystal display device. 101... Night product panel 102 ・Electroluminescence (EL) 103 ・・Protective film 104 ・・Polarizing plate 105 ・・Polarizing plate that also serves as a protective film

Claims (1)

[Claims] In a liquid crystal display device that uses electroluminescence as a light source, the liquid crystal panel is composed of a pair of substrates sandwiching a liquid crystal layer and is covered with a protective film, and the protective film is formed of at least one of a polarizing plate and a retardation plate. A liquid crystal display device characterized by: