JP3067429B2 - Color 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 color liquid crystal display device used for a color liquid crystal television, a color liquid crystal display of a computer, and the like.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional example of this type of color liquid crystal display device. This color liquid crystal display device has a diffusion plate 20 as a backlight behind a color liquid crystal panel 10.
It has a structure in which a plurality of fluorescent lamps 22 and reflectors 24 are arranged.

A color liquid crystal panel 10 has 90 liquid crystal molecules.
Transparent electrodes 12 and 13 above and below liquid crystal 11 twisted
Are provided, and glass substrates 14 and 15 are provided above and below the polarizing plate.
6 and 17 are provided.

The transparent electrodes 12 and 13 may be a number of stripe-shaped electrodes orthogonal to each other, or one of the transparent electrodes 13 may be a number of pixel electrodes and the other may be a transparent electrode 12.
May be a common electrode, but in any case, a large number of pixels arranged in a matrix are formed between the upper and lower transparent electrodes 12 and 13.

By controlling the voltage applied between the transparent electrodes 12 and 13, each pixel transmits or blocks light by a shutter action utilizing the electro-optical anisotropy of the liquid crystal 11.

Further, for color display, red (R),
A color filter 18 in which the three primary colors of green (G) and blue (B) are arranged corresponding to each pixel is used.
2 and the glass substrate 14. In order to obtain a high contrast ratio between the colors of the color filter 18,
A light shielding layer (black matrix or black stripe) 19 is provided.

As described above, the conventional color liquid crystal display device is
Color display is performed by using the fluorescent lamp 22 as a light source and passing the light transmitted through the liquid crystal 11 through the color filter 18.

The color filter 18 is formed by applying a dyeing substrate onto a substrate, exposing the substrate to a mask, developing the pattern, and applying a material colored with a dye or pigment to the substrate. And a printing method of patterning by screen printing or flexographic printing.

[0009]

However, in the above-mentioned color liquid crystal display device, the fluorescent lamp 22 is used as a light source and the liquid crystal 1 is used.
Since the light transmitted through 1 passes through the color filter 18, the transmittance of the color filter 18 is reduced. for that reason,
This leads to a decrease in luminance, which is an important element of the image quality characteristics. In order to increase the luminance, it is necessary to increase the power of the light source, which causes a problem that power consumption cannot be reduced.

Accordingly, the present invention provides a color liquid crystal display device which enables color display without using a color filter causing a decrease in luminance, thereby achieving both luminance and low power consumption. Its primary purpose is to provide.

[0011]

In order to achieve the above object, a color liquid crystal display device according to the present invention comprises a liquid crystal in which transparent electrodes are provided on both upper and lower sides of a liquid crystal to form a large number of pixels arranged in a lattice. A panel and a plurality of first to third optical fibers with a condensing lens arranged along the back of each pixel row of the liquid crystal panel, wherein one of the first to third optical fibers with a condensing lens is provided. And a red light source that allows red light to be incident from one end side into all the first optical fibers with a condenser lens, and a red light source that makes red light incident from one end side into all the optical fibers with a condenser lens. a green light source which Ru is incident green light from its one end, all of the first 3
And a blue light source for allowing blue light to enter from one end of the optical fiber with a converging lens. Further, each of the first to third optical fibers with a condensing lens respectively converts the light incident on one end thereof. It is characterized in that a transparent optical fiber emitted from the side surface is arranged along a condenser lens that emits light emitted from the transparent optical fiber substantially parallel to a corresponding pixel row of the liquid crystal panel.

[0012]

According to the above arrangement, the red light emitted from the red light source is guided to each corresponding pixel column of the liquid crystal panel by each first optical fiber with a condenser lens, and is substantially parallel to each pixel column. It is incident as light. Similarly, the green light emitted from the green light source is guided to each corresponding pixel column of the liquid crystal panel by each second optical fiber with a condenser lens, and is incident on each pixel column as substantially parallel light. Further, the blue light emitted from the blue light source is guided to each corresponding pixel column of the liquid crystal panel by each third optical fiber with a condenser lens, and is incident on each pixel column as substantially parallel light.

The three primary color light sources, the first to third light sources,
By combining the optical fiber with a condensing lens and the liquid crystal panel, a stripe-type color pattern arrangement in which red, green, and blue are arranged in a stripe pattern can be realized without using a color filter as in the related art. That is, color display can be performed.

[0014]

FIG. 1 is a schematic sectional view partially showing a color liquid crystal display device according to an embodiment of the present invention. FIG.
FIG. 2 is a schematic rear view of the entire color liquid crystal display device of FIG. 1.

This color liquid crystal display device has a so-called black-and-white liquid crystal panel 30 and a large number of first liquid crystal panels 30 provided behind it.
To third optical fibers with condenser lens 40a to 40c
A red light source 46a that causes red light to be incident on all the first converging lens-equipped optical fibers 40a from one end thereof,
A green light source 46b for allowing green light to enter all the second optical fibers 40b with condenser lens from one end thereof, and a blue light for entering blue light from one end side to all third optical fibers 40c with condenser lens. And a light source 46c.

In the liquid crystal panel 30, transparent electrodes 32 and 33 are provided above and below a liquid crystal 31 in which liquid crystal molecules are twisted by 90 degrees, and glass substrates 34 and 35 are provided above and below the transparent electrodes 32 and 33, respectively.
Further, a polarizing plate 36 and a polarizing plate 37 whose polarization directions are orthogonal to each other are provided on the upper and lower sides.

The transparent electrodes 32 and 33 may be a large number of striped electrodes orthogonal to each other, or one of the transparent electrodes 33 may be a large number of pixel electrodes and the other may be a transparent electrode 32.
May be a common electrode, but in any case, a large number of pixels arranged in a lattice are formed between the upper and lower transparent electrodes 32 and 33. The dashed line in FIG. 2 illustrates only three pixel columns 38 formed in this way.

By controlling the voltage applied between the transparent electrodes 32 and 33, each pixel transmits or blocks light by a shutter action utilizing the electro-optical anisotropy of the liquid crystal 31.

The driving method of each pixel may be a simple matrix method in which each pixel is directly driven by an external signal, or an active matrix method in which each pixel performs a kind of storage operation using a thin film transistor (TFT) or the like. .

Each of the first to third optical fibers with a condenser lens 40a to 40c is connected to the liquid crystal panel 3 as described above.
0 along each of the pixel rows 38, and the first to third optical fibers 40a to 40c with a condenser lens.
0c are arranged one by one.

The first to third optical fibers 40a to 40c each having a condenser lens are provided with transparent optical fibers 41a to 41c for emitting light incident on one end thereof in the longitudinal direction (that is, from the side). And the light 44 that came out of it
Are arranged along the condenser lenses 42a to 42c that emit light substantially in parallel (that is, do not diverge or converge) toward the corresponding pixel row 38 of the liquid crystal panel 30.
Each of the optical fibers 41a to 41c is typically a transparent glass fiber.

In this color liquid crystal display device, the red light emitted from the red light source 46a is guided to the corresponding pixel columns 38 of the liquid crystal panel 30 by the first optical fibers 40a with a condenser lens, respectively. The light is incident on the column 38 as substantially parallel light. Similarly, the green light emitted from the green light source 46b is transmitted to the second
0b, each corresponding pixel column 38 of the liquid crystal panel 30
, And is incident on each pixel column 38 as substantially parallel light. Further, the blue light emitted from the blue light source 46c is guided to each corresponding pixel column 38 of the liquid crystal panel 30 by each third condensing lens-equipped optical fiber 40c, and is substantially parallel to each pixel column 38 as light. Incident.

The three primary color light sources 46a to 46c,
First to third optical fibers 40a to 4 with condenser lens
The combination of Oc and the liquid crystal panel 30 realizes a stripe-type color pattern arrangement in which red (R), green (G), and blue (B) are arranged in a stripe without using a color filter as in the related art. be able to. That is, color display can be performed.

Further, in this color liquid crystal display device, since no color filter is used, a decrease in light transmittance is small, and the optical fibers 41a to 41c constituting the optical fibers 40a to 40c with condenser lenses are transparent, so The decrease in light transmittance is so small as to be negligible, and the light is prevented from being diffused by the condenser lenses 42a to 42c so as to effectively use the light. The brightness of the color liquid crystal display device is higher than that of the color liquid crystal display device. Conversely, if the luminance is the same, the color liquid crystal display device requires lower power consumption. That is, both luminance and low power consumption can be achieved.

Further, in this color liquid crystal display device, the light 44 is emitted from the optical fibers 40a to 40c with condenser lenses almost in parallel. A contrast ratio can be obtained. Therefore, it is not necessary to provide the light-shielding layer 19, so that the manufacturing process can be simplified.

[0026]

As described above, according to the present invention, the combination of the light sources of the three primary colors, the first to third optical fibers with a condenser lens, and the liquid crystal panel eliminates the need for a color filter as in the prior art. However, color display can be performed.

Further, since the color filter is not used, the decrease in light transmittance is small, and since the optical fibers constituting each optical fiber with a condenser lens are transparent, the decrease in light transmittance there is negligible. Further, since the light is prevented from being diffused by the condensing lens to effectively use the light, it is possible to achieve both luminance and low power consumption.

Further, since the light emitted from each optical fiber with a condensing lens is emitted almost in parallel, a high contrast ratio can be obtained without providing a light-shielding layer as in the conventional example. The manufacturing process can be simplified.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view partially showing a color liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a schematic rear view of the entire color liquid crystal display device of FIG.

FIG. 3 is a schematic sectional view partially showing an example of a conventional color liquid crystal display device.

[Explanation of symbols]

 Reference Signs List 30 liquid crystal panel 31 liquid crystal 32, 33 transparent electrode 40a first optical fiber with condenser lens 40b second optical fiber with condenser lens 40c third optical fiber with condenser lens 41a-41c optical fiber 42a-42c condenser lens 46a red light source 46b Green light source 46c Blue light source

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-149088 (JP, A) JP-A-3-1718104 (JP, A) JP-A-3-15022 (JP, A) JP-A-55-15088 29892 (JP, A) JP-A-5-134252 (JP, A) JP-A-2-19002 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1335 G02B 6 / 04

Claims (1)

(57) [Claims] 1. A liquid crystal panel in which transparent electrodes are provided on both upper and lower sides of a liquid crystal to form a large number of pixels arranged in a lattice, and arranged behind each pixel row of the liquid crystal panel. A plurality of first to third optical fibers with a condensing lens, wherein the first to third optical fibers with a condensing lens are arranged so as to form a pair, from one end side of the lens with the optical fiber and the red light source to be incident red light, a green light source which Ru is incident green light from its one end side to all of the second focusing lens with the optical fiber, all of the third from one end in the optical fiber with a condenser lens and a blue light source to be incident blue light, yet the first to third respective condensing lens with the optical fiber of each side of the light incident on one end transparent emitted from A color liquid crystal display device comprising: an optical fiber; and a condensing lens for emitting light emitted from the optical fiber substantially parallel to a corresponding pixel column of the liquid crystal panel.