JP2755543B2 - Liquid crystal display - Google Patents

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.
More specifically, a liquid crystal display device in which each pixel can display any of monochromatic light of red (hereinafter, referred to as R), green (hereinafter, referred to as G), and blue (hereinafter, referred to as B) or a combined light thereof (Hereinafter referred to as LCD).

[0002]

2. Description of the Related Art Conventionally, when a color display is performed using a liquid crystal display panel, as shown in FIG. 6, a color filter or a color polarizing plate is provided on one of the front and back surfaces of the pixel 32 of the liquid crystal display panel 31. (Not shown) to provide R, G,
B so that any of the colors can be transmitted,
Multicolor display is performed as a constituent unit of a set. For example,
Pixels 32a, 32b, and 32c vertically arranged in the order of R, G, and B are used as a set of constituent units, and only light of a desired color pixel out of light emitted from the backlight 36 behind the liquid crystal display panel 31 is emitted. The light is transmitted, and the transmitted light is guided forward and in parallel by the opening 34 of the light guide plate 33, and is projected on the screen 35 to perform color display.

[0003]

However, conventional LCDs
When a large screen is formed by arranging a large number of display panels by arranging wiring to each pixel, even if the pixel spacing at the seam is large, the aperture ratio is increased, and one pixel is restricted by the pitch. Cannot be smaller than 2 mm, the liquid crystal display device becomes large, and R, G, B
A distance of 5 m or more is required in order to recognize colors by mixing the viewing angles. Such a large-screen liquid crystal display device is easy to view at a distance of 5 m or more when applied to a display for street display outdoors, but is relatively small used for indoor display and the like. When it is desired to apply the present invention to a screen display, it is impossible to view the image at a distance, so that the distance between pixels is conspicuous, and the effect of mixing the viewing angles cannot be sufficiently obtained. As a result, high-density color display becomes difficult.

The present invention has been made to solve such a problem, and an object of the present invention is to provide an LCD which enables high-density color display on a small screen.

[0005]

An LCD according to the present invention comprises a liquid crystal display panel in which a liquid crystal layer is sandwiched between two transparent substrates provided with electrode films, and a regular arrangement for each pixel of the liquid crystal display panel. It comprises two or more types of color filter elements of the same size provided, and a light guide plate provided so as to be able to move on the display surface of the liquid crystal display panel in parallel with the display panel. A light guide portion having a tapered shape that increases toward the surface side is provided corresponding to each pixel, and a light guide end portion of the light guide portion that is the end portion on the display panel side has a size corresponding to each of the color filter elements. It is characterized by being formed.

The color filter element is composed of three circular color filter elements, the three color filter elements are arranged in an equilateral triangle, and the pitch p between each color filter element is equal to the color filter element. When the diameter of the element is D,

[0007]

(Equation 2)

[0008] Preferably, the range is

[0009]

According to the present invention, each pixel is provided with a color filter element of a plurality of colors and a light guide plate for expanding the transmitted light of each color filter on the display surface is provided. Is easily obtained. In addition, since the light guide plate can be moved on the liquid crystal display panel, the color of the color filter element of each pixel can be arbitrarily changed, and the light guide portion of the light guide plate can be changed to two or more types of color filter elements. By combining them, a mixed color of two or more colors can be obtained, and an arbitrary color display screen can be easily obtained.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Will be described. 1 is an explanatory perspective view showing an embodiment of the LCD of the present invention, FIG. 2 is an enlarged sectional explanatory view of a light guide plate of the LCD of FIG. 1, and FIGS. 3 and 4 are RGB color filters of the LCD of FIG. FIG. 5 is a schematic explanatory view showing the positional relationship between the elements and the light guide end of the light guide plate, and FIG. 5 is an explanatory view showing the positional relationship between the color filter elements of FIG.

As shown in FIG. 1, the LCD of the present invention
The liquid crystal display panel 1 has a liquid crystal material sandwiched between two transparent substrates provided with an electrode film and the like. A liquid crystal display panel 1 is provided with a light guide plate 2 and a screen 3 made of an antireflection film or the like in the front, and a backlight 4 on the back. Each of the pixels 5 provided and arranged in a matrix is provided with color filter elements 6a, 6b, and 6c of three colors of R, G, and B so as to form an equilateral triangle. The light guide plate 2 is, as shown in FIG.
A light guide section 7 corresponding to each pixel is provided on the display panel 1 side, which has the size of a color filter element, and the screen 3 side has a size of a pixel 5, and slides laterally to change the color of each pixel. You can choose.

The color filter elements 6a, 6 at each pixel
The relationship between b and 6c will be described with reference to FIG. Each pixel 5 has three color filter elements 6a and 6 of R, G and B.
The color filters b and 6c are formed as one constituent unit, and are arranged in a fixed positional relationship so that the arrangement of the color filter elements 6a, 6b and 6c forms an equilateral triangle.

By moving the light guide plate 2 laterally on the display panel so that the light guide end portion 7a is at a position indicated by, for example, a double circle in FIG. Indicates color. Further, the light guide plate 2 is connected to the light guide end 7a.
Is adjusted so as to match the position of the color filter element 6 of any one of the colors R, G, and B of each pixel 5, so that only transmitted light of a desired color is selected. After being enlarged to the size of the pixel, the image can be projected on the screen 3. As a result, the same color can be displayed on each pixel 5 of the display screen. Therefore, compared with the conventional method of displaying using only pixels of a desired color out of the three pixels, the interval between the display pixels is small, and a very high-density display is possible, and the light guide end 7a Is positioned in the middle of the color filter elements 6a, 6b, 6c, an arbitrary color mixture can be obtained. For example, by aligning the light guide end 7a with the center of the three color filter elements indicated by double circles in FIG. 4, a mixed white color is obtained.

The mixed color display of R, G and B will be described in more detail with reference to FIG. By moving within the range A (the hatched range in FIG. 5) on the pixel and disposing the light guide end 7a of the light guide 7 on the liquid crystal display panel 1 side at an intermediate position between the two color filter elements, The light transmitted through the color filter element is synthesized in the light guide unit 7, and the light of the intermediate color can be projected on the screen 3 and displayed. For example, a light guide end 7a of the light guide plate 7 is provided in front of an intermediate position between the color filter element 6a for displaying red and the color filter element 6b for displaying green.
Is disposed, yellow can be projected on the screen 3. Further, in the case of displaying white, as described above, if the light is moved to the vicinity of the center of the range A so that all three color filter elements 6a to 6c have the same area, the three colors of light are mixed and white. Of light. on the other hand,
In the case of displaying black, it is obtained by prohibiting the transmission of light by the drive voltage between the electrodes of the liquid crystal display panel. Furthermore, by making the position of the light guide end 7a of the light guide plate 2 overlap with any one of the color filter elements, not only an intermediate color but also an arbitrary color can be displayed.

As described above, the R, G, and B color filter elements 6a, 6b, and 6c in each pixel are provided so as to form an equilateral triangle in each pixel, and the color is selected by moving the light guide plate. It is convenient. In this case, considering the mixed color of the two colors, it is desirable to set the interval between the respective color filter elements within a certain range. That is, the light guide end 7a is not used for mixing light.
In this case, it is necessary to prevent the light guide end 7a from overlapping the color filter element 6c) for blue display. Therefore, the light guide end 7a is divided into two color filter elements 6
It is necessary to keep the distance p between the centers of the color filter elements so that the light guide end 7a does not overlap with the remaining color filter elements 6c even when the light guide end 7a is located at an intermediate position between the color filter elements 6a and 6b. Therefore, if the diameter of each color filter element is D and the diameter of the light guide end 7a is the same size, the common tangents of the color filter elements 6a and 6b on the color filter element 6c side and the color filter element in FIG. 6c
Must be positive. Expressing this relationship as an equation,

[0016]

(Equation 3)

On the other hand, in order to mix the two colors, the diameter of the light guide end 7a must overlap the two color filter elements (for example, the color filter elements 6a and 6b). Therefore, p <2D (2) must be satisfied. Since light transmitted through each color filter element is not obtained as transmitted light unless it enters the light guide end 7a, it is preferable that p ≦ 1.5D.

From equations (1) and (2)

[0019]

(Equation 4)

Preferably,

Further, in order to externally adjust the display color, the light guide plate 2 is provided with a driving means such as a servo motor, a linear motor or a pulse motor, and the light guide plate 2 is provided with a driving means such as a servo motor, linear motor or pulse motor.
If the light guide plate 2 can be moved with high precision in the direction, the light guide plate 2 is moved relative to the liquid crystal display panel in accordance with a color signal from the outside, and the light guide plate 2 is moved to a desired position in front of each pixel 5. The end 7a can be arranged, and an arbitrary color can be automatically displayed.

The color filter elements 6a, 6b, 6
Although c has been described as an example of a circle, the shape is not necessarily limited to a circle, and the center may be arranged in an equilateral triangle. The shape of each pixel is not limited to a circle, but may be a polygon or the like. In the case of a color filter element having a polygonal shape other than these circles, the circumscribed circle of each color filter element is considered, and the relational expression (3) is set between the diameter D of the circumscribed circle and the interval p between each color filter element. Is satisfied, two or more kinds of mixed colors can be obtained as in the above-described embodiment.

Further, the color filter elements 6a, 6
b and 6c are not limited to the three colors of R, G and B, but may be composed of other colors to form the three colors.

[0024]

According to the LCD of the present invention, light of a plurality of colors can be obtained by one pixel, so that the density of the pixels can be increased and the size of the liquid crystal display panel can be reduced.
Therefore, the present invention can be applied to a small liquid crystal display device having a high pixel density, which has been developed and put into practical use in recent years, for example, a liquid crystal display type personal computer. Also, instead of a liquid crystal display device, PDP (plasma display) or VF
Even when the present invention is applied to D (fluorescent display tube), a sufficient visual mixing effect can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view showing one embodiment of an LCD of the present invention.

FIG. 2 is an enlarged sectional explanatory view of a light guide plate of the LCD of FIG.

FIG. 3 is a schematic explanatory view showing a positional relationship between R, G, and B color filter elements of the LCD of FIG. 1 and light guide ends of a light guide plate.

FIG. 4 is a schematic explanatory view showing a positional relationship between R, G, and B color filter elements of the LCD of FIG. 1 and light guide ends of a light guide plate.

FIG. 5 is an explanatory diagram showing a positional relationship between color filter elements of the LCD of FIG. 1;

FIG. 6 is a schematic perspective view of a conventional color liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Light guide plate 5 Pixel 6a, 6b, 6c Color filter element 7 Light guide part 7a Light guide end

Claims (2)

(57) [Claims] 1. A liquid crystal display panel having a liquid crystal layer sandwiched between two transparent substrates provided with an electrode film, and two or more kinds of the same size regularly provided for each pixel of the liquid crystal display panel. And a light guide plate provided so as to be movable in parallel with the display panel on the display surface of the liquid crystal display panel, and the light guide plate has a tapered shape that increases toward the display surface side. A liquid crystal display device in which a light guide section is provided corresponding to each pixel, and a light guide end, which is an end on the display panel side, of the light guide section is formed in a size corresponding to each color filter element. . 2. The color filter element comprises three circular color filter elements, the three color filter elements are arranged in an equilateral triangle, and the pitch p between each color filter element is equal to the color filter element. Element diameter is D
Then, 2. The liquid crystal display device according to claim 1, wherein