KR970000353B1 - Liquid crystal display elements - Google Patents

Abstract

Liquid crystall device in order to removing the reason of interference color because of remaining the components of the ellipse polarization from the light that pass through the optical phase film, and to enable to display the pure white. Therefore the LCD provides the second optical phase film between the liquid crystall and the bottom polarization plate.

Description

LCD

1 is an exploded perspective view of a conventional liquid crystal display device structure.

2 is a reference diagram showing the optical characteristics of FIG.

3 is an exemplary diagram showing a structure of a liquid crystal display device of the present invention.

4 is a reference diagram showing the optical axis direction of FIG.

5 is a reference diagram showing the optical characteristics according to the present invention.

* Explanation of symbols for main parts of the drawings

1: upper polarizing plate 2: first optical phase film

3: liquid crystal cell 4: second optical phase film

5: lower polarizing plate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having improved visibility of the liquid crystal display device. In the conventional liquid crystal display device (hereinafter, abbreviated as LCD), an elliptical polarized light having passed through the liquid crystal cell 3 by inserting an optical phase film 2 between the upper polarizing plate 1 and the liquid crystal cell 3 as shown in FIG. The linear polarization is made, and the black and white display is made possible by passing or blocking the light by applying or not applying voltage.

However, in this prior art, the optical phase film 2 of the four-in-one LCD structure arrangement is not ideal for completely making the elliptical polarization linearly polarized, so that some elliptical polarization component is usually left.

That is, as shown in FIG. 2, in the conventional LCD, light is absorbed in the 400-500 µm wavelength band and is slightly blue, which makes it difficult to completely display white.

The structural disadvantages of such conventional LCDs remained as a result in increasing human visibility of the display function.

SUMMARY OF THE INVENTION An object of the present invention is to improve the conventional problems as described above. In particular, the elliptical polarization component remains in the light passing through the optical phase film as described above, eliminating the cause of the interference color and allowing the LCD to be completely white. Provided.

The present invention is characterized in that the LCD is provided with a second optical phase film between the liquid crystal cell and the lower polarizing plate, and the LCD is configured to experimentally reset the axial angle and the like of the constituent members constituting each LCD. .

This will be described in more detail below.

That is, FIG. 3 shows the LCD according to the present invention.

Here, the first optical phase film 2 is interposed between the upper polarizing plate 1 and the liquid crystal cell 3, and the second optical phase film 4 is interposed between the liquid crystal cell 3 and the lower polarizing plate 5. It becomes the structure interposed.

Further, the elliptical polarization component of the LCD was completely removed to make a perfect linear polarization, so that the complete white display could be performed as follows.

Example

Through the above-described process, the result of enabling complete linearly polarized light among the relative variables between the upper and lower polarizing plates 1 and 5 and the first and second optical phase films 2 and 4 and the liquid crystal cell 3 is obtained. With reference to FIG. 4, it was obtained as follows (Table 1).

As such, by setting the thickness and the axial angle of the LCD component according to the conditions of the above (Table 1), the elliptical polarization does not appear to the outside of the LCD, and only the complete linear polarization appears, thereby enabling almost complete monochrome display as shown in FIG. You can get an LCD. The present invention improves the visibility of the display function displayed on the LCD itself by improving the structure arrangement and the axial angle of the LCD, which is an advantageous feature to make the quality of such articles higher.

Claims (2)

In the LCD structure in which the upper polarizing plate 1, the first optical phase film 2, the liquid crystal cell 3, the second optical phase film 4, and the lower polarizing plate 5 are arranged in this order, the first and second vanes A liquid crystal display device characterized in that d · Δn = 0.4 mm to 0.5 mm, which is the thickness of the optical phase films 2 and 4, and d · Δn = 0.6 mm to 0.7 mm of the liquid crystal cell 3. . According to claim 1, wherein the absorption axis angle of the upper polarizing plate 1 a ₁ , the optical axis angle of the first optical phase film 2 b ₁ , the upper rubbing direction of the liquid crystal cell 3 c ₁ , the lower polarizing plate When the absorption axis angle of (5) is a ₂ , the optical axis angle of the second optical phase film 4 is b ₂ , and the harving direction of the liquid crystal cell 3 is c ₂ , a ₁ = 115 ° and b ₁ = 85 °, c ₁ = -30 °, a ₂ = 95 °, b ₂ = 85 °, c ₂ = 210 °.

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