JP3672466B2 - Liquid crystal display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device, for example, a color liquid crystal display device including a backlight.
[0002]
[Prior art]
In the liquid crystal display panel, a transparent substrate, which is disposed to face each other with liquid crystal interposed therebetween, is used as an envelope, and a display unit including a large number of pixels is formed in the liquid crystal spreading direction.
[0003]
Each pixel constituting the display unit is provided with means for generating an electric field having a predetermined strength, and the light transmittance of the liquid crystal can be controlled by this electric field.
[0004]
For this reason, this liquid crystal display panel is usually provided with a backlight made of, for example, a cold cathode ray tube on the back side thereof.
[0005]
[Problems to be solved by the invention]
However, in the liquid crystal display device having such a configuration, in the case of color, a loss of light from the backlight is generated, and countermeasures have been taken.
[0006]
That is, the color liquid crystal display device has red (R), green (G), and blue for each pixel on the liquid crystal side surface of one of the transparent substrates that are disposed to face each other via the liquid crystal. A color filter of any color of (B) is formed.
[0007]
The white light from the cold cathode ray tube passes through each of these color filters and reaches the viewer side as light of each color of red, green, and blue. In this case, for example, white light that passes through the red filter Of the light, light of green and blue color components is absorbed by the red filter, and only light of the red component is transmitted.
[0008]
The same applies to white light that passes through a green or blue filter.
[0009]
For this reason, as a whole, the light from the backlight absorbs 2/3 of the amount of incident light by the color filter.
[0010]
The present invention has been made based on such circumstances, and an object of the present invention is to provide a high-brightness liquid crystal display device by improving the utilization efficiency of light such as a backlight.
[0011]
[Means for Solving the Problems]
Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
[0012]
That is, a color filter formed in each pixel region of the liquid-crystal-side surface of one transparent substrate of the oppositely disposed transparent substrate through the liquid crystal, the light to be transmitted through the liquid crystal and the color filter of each pixel region And a phosphor that emits the same color as the color filter before being transmitted through the color filter by irradiation of light from the illumination unit, and a black matrix is formed between the color filters. In addition, a black matrix is formed between the phosphors, and the width of the black matrix formed between the phosphors is larger than the width of the black matrix formed between the color filters. It is a feature.
[0013]
In the liquid crystal display device configured in this way, only visible light corresponding to each color is incident on each color filter, so that the loss of light in these filters can be greatly reduced. Become.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the liquid crystal display device according to the present invention will be described below with reference to the drawings.
[0015]
[Example 1]
FIG. 1 is a schematic configuration diagram showing an entire liquid crystal display device according to the present invention.
[0016]
First, there is a liquid crystal display panel 1. The liquid crystal display panel 1 includes a transparent substrate disposed opposite to each other with liquid crystal as an envelope, and a display unit including a collection of a large number of pixels is formed in the liquid crystal spreading direction.
[0017]
Each pixel constituting the display unit is provided with means for generating an electric field having a predetermined strength, and the light transmittance of the liquid crystal can be controlled by this electric field.
[0018]
A backlight 2 is disposed on the side opposite to the side on which the liquid crystal display panel 1 is observed, that is, on the back surface of the liquid crystal display panel 1, and the backlight 2 has a cylindrical shape in this embodiment. A plurality of ultraviolet lamps 2A and a reflecting plate 2B for efficiently irradiating the liquid crystal display panel 1 with ultraviolet rays from the ultraviolet lamps 2A.
[0019]
Further, in the case of this embodiment, the phosphor film portion 3 is disposed between the backlight 2 and the liquid crystal display panel 1.
[0020]
FIG. 2 is a diagram showing details of the phosphor film portion 3 in relation to the color filter 4 formed in the liquid crystal display panel 1.
[0021]
Here, in the liquid crystal display panel 1, an electric field generating unit in each pixel region between the transparent substrates 1A and 1B is not shown, and the backlight 2 is connected via a liquid crystal whose light transmittance is changed by the electric field generating unit. Only the color filter 4 through which the visible light 5 is transmitted from the side is shown.
[0022]
The color filter 4 is formed for each pixel region adjacent in the x direction in the figure. For example, from the left side in the figure, the red (R) filter 4R, the green (G) filter 4G, the blue (B) filter 4B, and the red ( R) filter 4R,...
[0023]
On the other hand, the phosphor film part 3 is configured by applying a phosphor film 6 on one surface of the transparent substrate 3A. The phosphor film 6 is red (R) when irradiated with ultraviolet rays 8 from the backlight 2. Phosphor film 6R that emits visible light (referred to here as a red phosphor film for convenience), phosphor film 6G that emits green (G) visible light (referred to here as a green phosphor film for convenience), blue The phosphor film 6B emits visible light (B) (referred to herein as a blue phosphor film for convenience).
[0024]
The phosphor films 6 of the respective colors are formed for each pixel region adjacent to the liquid crystal display panel 1 in the x direction, and the red phosphor film 6R is opposed to the red (R) filter 4R and is also green. The phosphor film 6G is formed to face the green (G) filter 4G, and the blue phosphor film 6B is formed to face the blue (B) filter 4B.
[0025]
That is, for example, the red phosphor film 6R emits red visible light 5R by irradiation of the ultraviolet rays 8 from the backlight 2 side, and the light is a pixel facing the red phosphor film 6R of the liquid crystal display panel 1. The light passes through the liquid crystal in the region and the red (R) filter 4R, and is irradiated to the viewer side.
[0026]
Similarly, the green phosphor film 6G emits green visible light 5G, and the light is transmitted through the liquid crystal in the pixel region facing the green phosphor film 6G of the liquid crystal display panel 1 and the green (R) filter 4G. Then, the blue phosphor film 6B emits blue visible light 5B, and the light is emitted from the liquid crystal in the pixel area facing the blue phosphor film 6B of the liquid crystal display panel 1 and the blue color. The light passes through the filter 4B of (B) and is irradiated to the observer side.
[0027]
By configuring in this way, only visible light 5 corresponding to each color is incident on the filter 4 of each color, so that the loss of light in these filters 4 can be greatly reduced. It becomes like this.
[0028]
In the figure, for easy understanding, the liquid crystal display panel 1 and the phosphor film portion 3 are shown separated from each other, but are actually arranged close to each other from the viewpoint of effective use of light. It becomes like this.
[0029]
[Example 2]
FIG. 3 is a block diagram showing another embodiment of the liquid crystal display device according to the present invention and corresponds to FIG.
[0030]
Compared with the case of FIG. 2, each color filter 4 has a black matrix layer 10 formed between them, and correspondingly, a black matrix layer 11 is also formed between the phosphor films 6 of each color. Have a difference.
[0031]
As the black matrix layer 11 on the phosphor film part 3 side, a material that reflects the ultraviolet rays 8, for example, aluminum (Al) is suitable.
[0032]
In this case, the width of the black matrix layer 11 on the phosphor film part 3 side is formed smaller than the width of the black matrix layer 10 on the filter 4 side.
[0033]
When it does in this way, the effect which can reduce the loss by the spread of light comes to be show | played.
[0034]
Example 3
FIG. 4 is a block diagram showing another embodiment of the liquid crystal display device according to the present invention and corresponds to FIG.
[0035]
Compared with the case of FIG. 3, in the transparent substrate 3A coated with the phosphor film 6, the microlens 13 is formed in each region facing each pixel region of the liquid crystal display panel 1, and the transparent substrate 3A itself is a lens. There is a difference in being an array.
[0036]
The liquid crystal display device configured as described above can reduce the loss of visible light due to light diffusion even when the aperture ratio of each pixel in the liquid crystal display panel 1 is small.
[0037]
Example 4
FIG. 5 is a block diagram showing another embodiment of the liquid crystal display device according to the present invention and corresponds to FIG.
[0038]
Compared to the case of FIG. 4, there is a difference in that the fiber lens is formed in the portion where the micro lens is formed.
[0039]
That is, a core portion 15B surrounded by the cladding portion 15A is formed in each region facing each pixel region of the liquid crystal display panel 1.
[0040]
In this case, the opening portion of the black matrix layer 11 formed between the phosphor films 6 of the respective colors is formed to be the same as or smaller than the core portion 15B.
[0041]
By doing in this way, the visible light emitted from the phosphor film 6 can be efficiently introduced into the core portion 15B.
[0042]
【The invention's effect】
As is apparent from the above description, according to the liquid crystal display device of the present invention, it is possible to improve the utilization efficiency of light such as a backlight and to obtain a high-luminance display.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing an embodiment of a liquid crystal display device according to the present invention.
2 is a configuration diagram illustrating an example of the liquid crystal display panel and the phosphor film portion illustrated in FIG.
3 is a configuration diagram showing another embodiment of the liquid crystal display panel and phosphor film portion shown in FIG.
4 is a configuration diagram showing another embodiment of the liquid crystal display panel and the phosphor film portion shown in FIG. 1. FIG.
5 is a configuration diagram showing another embodiment of the liquid crystal display panel and the phosphor film portion shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display panel, 1A, 1B ... Transparent substrate, 2 ... Back light, 3 ... Phosphor film part, 3A ... Transparent substrate, 4 ... Color filter, 5 ... Visible light, 6 ... Phosphor film, 8 ... Ultraviolet light, 10, 11 ... Black matrix layer.

Claims (5)

A color filter formed in each pixel region of the liquid crystal side surface of one of the transparent substrates opposed to each other via the liquid crystal;
Illuminating means for generating light that is transmitted through the liquid crystal and color filter of each pixel region;
A phosphor that emits the same color as the color filter in a stage before passing through the color filter by irradiation of light from the illumination means ,
A black matrix is formed between the color filters, and a black matrix is also formed between the phosphors.
A liquid crystal display device , wherein a width of a black matrix formed between the phosphors is larger than a width of a black matrix formed between the color filters . 2. The liquid crystal display device according to claim 1, wherein the phosphor is disposed between a illuminating unit and a transparent substrate on a side of the illuminating unit among the transparent substrates disposed to face each other through a liquid crystal. . The liquid crystal display device according black matrix formed in the claim 1 or 2, characterized in that it is formed by aluminum between the phosphor. A lens array comprising lenses facing each pixel region is disposed between the phosphor and the transparent substrate disposed opposite to the phosphor through a liquid crystal, on the phosphor side. The liquid crystal display device according to any one of claims 1 to 3 . The liquid crystal display device according to any one of claims 1 to 4, characterized in that light from said illumination means is ultraviolet light.

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