JPH0511243A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent the picture quality from deteriorating and to obtain a screen which gives no sense of incongruity by providing a filter panel which converges pieces of light beam flux from three primary color light projection parts constituting a picture element in picture element units and transmits them. CONSTITUTION:The liquid crystal display device which has the liquid crystal display screen 11 formed by arraying plural picture elements M each composed of three primary color light projection parts R, G, and B emitting three primary color light beams is equipped with the filter panel 13 which converges the pieces of light beam flux from the three primary color projection parts R, G, and B constituting the picture elements for every picture elements M and transmits them. In this case, the filter panel 13 is formed by connecting concave lenses, formed in the longitudinal direction of the liquid crystal display screen 11, successively and laterally and each of the meniscus concave lenses has 1st and 2nd surfaces curved in a dish shape and in the same direction. Consequently, the three primary color beams can be mixed practically sufficiently for every picture elements M and colors of adjacent picture elements M are never mixed, thereby obtaining the screen which gives no feeling of physical disorder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device.
It is suitable to be applied to a liquid crystal display device in which dots of the same color among the dots of primary colors are arranged in the vertical direction.

[0002]

2. Description of the Related Art Conventionally, in a liquid crystal display device, as shown in FIG. 9, dots of a red primary color light emitting portion R, a green primary color light emitting portion G and a blue primary color light emitting portion B are vertically arranged for each same color. There is a so-called vertical stripe type.

This vertical stripe type liquid crystal display device has a feature that a contour of a display image can be made clear by a method of arranging each primary color light emitting portion in a stripe shape and a geometrical shape can be accurately expressed. It is used as a display screen of a computer that expresses a precise image such as a graph by making use of the characteristics.

[0004]

However, in this type of vertical stripe type liquid crystal display device, the dots of the same color are continuous in the vertical direction, and the red primary color light emitting portions R are evenly spaced in the horizontal direction. Since the dots of the green primary color light emitting portion G and the blue primary color light emitting portion B are sequentially arranged, for example, when a drawing such as a white rectangle is displayed, the colors of the adjacent emitting portions at the left end portion and the right end portion are mixed. As a result, red or blue vertical stripes become conspicuous, which causes a problem that image quality deterioration cannot be avoided.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a liquid crystal display device capable of preventing deterioration of image quality and obtaining a screen without discomfort.

[0006]

In order to solve such a problem, according to the present invention, a plurality of pixels M each composed of three primary color light emitting portions R, G and B are arranged so as to emit three primary color lights. A liquid crystal display device 10 that forms a liquid crystal display screen 11 includes a filter panel 13 that converges and transmits the light beam bundles from the three primary color light emitting portions R, G, and B that form the pixels M for each pixel M. To do so.

[0007]

The liquid crystal display screen 11 is provided with a filter panel 13 for converging the light fluxes from the three primary color light emitting portions R, G and B forming each pixel M on the liquid crystal display screen 11 for each pixel M. By installing on the front side, 3 for each pixel M
The two primary color lights can be sufficiently mixed in practical use. Therefore, it is possible to obtain a screen that is more comfortable without the colors of the adjacent pixels M mixing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 10 indicates a liquid crystal display device as a whole, and a filter panel 13 made of a transparent member is arranged on the front surface of a liquid crystal display screen 11.

As shown in FIG. 2, the liquid crystal display screen 11 has a so-called vertical arrangement in which dots of a red primary color light emitting portion R, a green primary color light emitting portion G, and a blue primary color light emitting portion B are vertically arranged for each same color. One pixel M is formed by grouping each dot of the red primary color light emitting portion R, the green primary color light emitting portion G, and the blue primary color light emitting portion B, which are stripe-shaped and sequentially arranged in the lateral direction.

In the filter panel 13, concave lenses L formed in the vertical direction are sequentially formed in the horizontal direction so as to correspond to the pixels of one vertical column aligned in the vertical direction of the liquid crystal display screen 11.

The concave lens L is a so-called meniscus concave lens in which the first surface and the second surface of the single lens are curved in a dish shape in the same direction, and is a liquid crystal display screen 11 as shown in FIG.
The incident surface (first surface S1) faces the dots of the three primary colors of the red primary color light emission portion R, the green primary color light emission portion G, and the blue primary color light emission portion B which are arranged in the lateral direction and form one pixel M of It is provided to do.

Here, the pitch of one pixel M (that is, the combination of dots consisting of R, G, and B) of the liquid crystal display screen 11 is P, the radius of curvature of the first surface S1 of the concave lens L is R1, and the curvature of the second surface S2. When the radius is R2, the surface spacing between the first surface S1 and the second surface S2 is D1, and the refractive index of the material forming the concave lens L of the meniscus is ND, the paraxial focal length f of the concave lens is

[Equation 1] It is expressed by the following relational expression.

When a light ray parallel to the optical axis is incident on the concave lens L, the inclination of the emitted light ray is (1).
It is represented by 1 / f in the equation.

In order to make the outgoing light rays parallel to the optical axis as shown in FIG. 3, the numerator of the equation (1) is set to 0 and the following equation:

[Equation 2] To get When this equation (2) is satisfied, the ratio β of the width of the outgoing ray and the width of the incoming ray is

[Equation 3] Is represented by

Further, the surface distance D between the first surface S1 and the second surface S2
1 is the following equation from the equation (3),

[Equation 4] And the radius of curvature R2 of the second surface S2 is obtained by the equation (2).

Here, in the case of this embodiment, the liquid crystal display screen 1
When a 10-inch diagonal 640 × 400 dot color display is used as 1, the pixel pitch P is set to 0.3 [mm] and the reduction rate β of the width of the light beam is set to 0.3 to 0.7.
The radius of curvature R1 of the surface S1 is given by

[Equation 5] And the refractive index ND when the material of the filter panel 13 is acrylic is 1.49, the reduction rate β of the ray bundle and the radius of curvature R of the first surface S1 are
1, the radius of curvature R2 of the second surface S2, and the surface distance D1 of the first surface S1 and the second surface S2 have the relationship shown in FIG.

Therefore, if the filter panel 13 is formed by connecting the concave lenses L having the values shown in FIG. 4 to each other, as shown in FIG.
The ray bundles from the red primary color light emitting portion R, the green primary color light emitting portion G, and the blue primary color light emitting portion B forming the pixel M are 1 each.
The light is converged in the lateral direction by the concave lens L of the pitch and emitted from the filter panel 13.

In this case, FIG. 5 shows a ray diagram when the light is incident parallel to the concave lens L, and FIG. 6 shows a ray diagram when the liquid crystal surface is the object point S0.

In FIG. 6, the object point S0 is about a paraxial magnification.
A virtual image SN of 0.5 times is formed, which means that the pixel is reduced.

As a paraxial amount of the concave lens L, the focal length f can be obtained from the equation (1), and the back focus BF can be obtained by the following equation:

[Equation 6] Is represented by

The image formation point SN is S1.0 at -1.0 and Y1 at 1.
Paraxially calculated as

[Equation 7] And the following equation,

[Equation 8] As

[Equation 9] Is obtained.

Further, the paraxial magnification m is expressed by the following equation:

[Equation 10] Is represented by

Therefore, the paraxial quantities are as follows: the radius of curvature R1 (= 0.6 [mm]) of the first surface S1 and the radius of curvature R2 (= of the second surface S2.
0.3 [mm]), the surface distance D1 between the first surface S1 and the second surface S2
(= 0.9 [mm]) and the refractive index ND (= 1.49) are substituted into the values shown in FIG.

In this way, a concave lens L of meniscus adapted to converge and emit the incident light beam is formed, and the concave lens L is successively formed in the lateral direction to form the filter panel 13.

In the above-described structure, the liquid crystal display device 10 has a set of pixels M each consisting of a red primary color light emitting portion R, a green primary color light emitting portion G, and a blue primary color light emitting portion B arranged in the horizontal direction. The ray bundle is laterally converged on the filter panel 13.

Therefore, it is possible to prevent the color components of adjacent pixels M from being mixed with each other while the three primary colors of each pixel are sufficiently mixed and recognized by the viewer.

Therefore, when a drawing such as a white rectangle is displayed, it is possible to avoid the colors of adjacent pixels from being mixed at the left end and the right end of the drawing. It is possible to prevent vertical stripes such as red or blue.

According to the above construction, since the filter panel 13 is provided on the front surface of the liquid crystal display screen 11, the red primary color light emitting portion R, the green primary color light emitting portion G and the blue primary color light emitting portion are provided for each pixel M. It is possible to sufficiently mix the colors of B, thereby preventing deterioration of image quality.

In the above embodiment, the case where the meniscus concave lens L is used as the filter panel has been described, but the present invention is not limited to this, and the point is that the red primary color light emitting portion R and the green primary color light emitting portion G are essential. It is sufficient that the light flux from the blue primary color light emitting portion B can be converged for each pixel M.

In the above-mentioned embodiment, the case where the filter panel 13 made of acrylic is used has been described, but the present invention is not limited to this, and the point is that the light flux from each pixel M is transmitted. good.

Further, in the above embodiment, the first surface S
No. 1 radius of curvature R1 (= 0.6 [mm]), second surface S2 radius of curvature R2 (= 0.3 [mm]), first surface and second surface spacing D1
(= 0.9 [mm]), refractive index ND (= 1.49), pixel pitch P
The liquid crystal display device with (= 0.3 [mm]) has been described,
The present invention is not limited to this, and various dimensions can be applied as needed, as shown in FIG. 8, for example.

[0033]

As described above, according to the present invention, each pixel is formed for each pixel forming the liquid crystal display screen.
By providing a filter panel on the front surface of the liquid crystal display screen that converges the light fluxes from the three primary color light emission parts, each pixel can be colored without a color change due to the light flux from the adjacent pixel. It is possible to sufficiently mix the three primary colors of the pixel. As a result, it is possible to realize a liquid crystal display device capable of preventing deterioration in image quality and obtaining a screen that is more comfortable.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a partial perspective view showing the structure of a filter panel.

FIG. 3 is a schematic diagram showing a relationship between a liquid crystal display screen and a filter panel.

FIG. 4 is a chart showing the geometrical dimensions of a concave lens.

FIG. 5 is a schematic diagram showing a transmission state of a bundle of rays in a filter panel.

FIG. 6 is a schematic diagram showing a state of light rays when a liquid crystal surface is an object point in a filter panel.

FIG. 7 is a chart showing calculation results of paraxial quantities.

FIG. 8 is a chart showing another embodiment.

FIG. 9 is a schematic diagram showing a configuration of a liquid crystal display screen.

[Explanation of symbols]

10 ... Liquid crystal display device, 11 ... Liquid crystal display screen, 13 ...
… Filter panel, L… concave lens, M… pixel, R…
… Red primary color light emission part, G …… Green primary color light emission part, B ……
Blue primary color light emitting part.

Claims (1)

Claims: 1. A liquid crystal display device for forming a liquid crystal display screen by arranging a plurality of pixels, each of which is composed of three primary color light emitting portions for emitting three primary color lights, the liquid crystal display device comprising: 2. A liquid crystal display device comprising: a filter panel that converges and transmits the light beam bundles from the three primary color light emitting portions that form each of the pixels.