JP2553577Y2 - Monochrome-color combined 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 monochrome / color combined liquid crystal display device which operates as a color image display device as required and also as a display device of an infrared night-vision device.

[0002]

2. Description of the Related Art An infrared night-vision apparatus has been used as a night search apparatus. A monochromatic display is used as a display of the infrared night vision device. That is, in a night vision device, in a dark place, an image of the night vision device must be viewed together with a large number of instruments. For this reason, it is stipulated that the display be performed, for example, with a light amount of a certain level of green or less, so that other instruments are also limited by the same standard.

FIG. 2 shows an example of a conventional display for an infrared night-vision device. In the figure, reference numeral 1 denotes a liquid crystal display panel. This liquid crystal display panel 1 uses a so-called transmissive liquid crystal display panel in which light emitted from a light source 3 provided behind is intermittently switched by an optical shutter made of liquid crystal to display an image. A diffusing plate 5 is laminated on the back surface of the liquid crystal display panel 1 so as to scatter light emitted from the light source 3 and make uniform light incident on the liquid crystal display panel 1.

[0004] The back of the diffusion plate 5 is covered by a light source storage box 6, and the light source 3 is mounted inside the light source storage box 6. A reflection plate 4 is attached to the inner wall surface of the light source storage box 6 so that the light of the light source 3 is effectively reflected and incident on the liquid crystal display panel 1. An ordinary white fluorescent lamp can be used as the light source 3, and only green light transmitted through the liquid crystal display panel 1 is transmitted by the green filter 2 laminated on the upper surface of the liquid crystal display panel 1. Therefore, the image is displayed in one color of green, and unnecessary wavelength components of the light are removed by the green filter 2 to conform to the standard as a night vision device.

[0005]

Conventional infrared night vision devices are designed to be used only at night. However, due to recent technological advances in the field of imaging devices, even in the daytime, images captured by the imaging device can be seen farther than they can be seen, making it convenient for searching. For this reason, a display device that displays a color image captured by a color imaging device in the daytime and operates as a display device of an infrared night-vision device at nighttime is required.

In order to satisfy this demand, first, in the structure of the conventional display device, the liquid crystal display panel 1 must be a liquid crystal panel for color display.
The green filter 2 hung on the surface must be removed. When the green filter 2 is removed, a monochromatic image display function that meets the standards of night vision devices must be realized instead of the green filter 2.

An object of the present invention is to provide a single-color / multi-purpose liquid crystal display device capable of displaying a single-color image without applying a green filter to the front of the liquid crystal display panel and realizing a color image display. It is assumed that.

[0008]

According to the present invention, a color liquid crystal display panel for displaying a color image by transmitted light, a light source storage box for covering the rear side of the color liquid crystal display panel, and an inner wall of the light source storage box are provided. Reflective plate, a light guide plate provided along the bottom surface of the light source storage box, a monochromatic light source embedded inside the light guide plate, a diffuser plate provided on the surface of the light guide plate, the diffuser plate and the color A monochromatic / color liquid crystal display device is constituted by a white light source provided between the liquid crystal display panel and a light-shielding plate for preventing light of the white light source from being directly irradiated to the monochromatic light source.

According to the configuration of the present invention, when the white light source is turned on, white light can be given to the liquid crystal display panel, and a color image can be displayed. By turning on the monochromatic light source, monochromatic light can be made incident on the color liquid crystal display panel through the light guide plate and the diffusion plate. Therefore, in this case, when the monochromatic light source is green, a green image can be displayed by controlling the color liquid crystal display panel to open and close only the green pixels.

Therefore, according to the present invention, it is possible to display a monochromatic image and a color image.

[0011]

FIG. 1 shows an embodiment of the present invention. 11 in the figure
Indicates a color liquid crystal display panel. In this color liquid crystal display panel, pixels are formed by a three-color dot color filter of red, green, and blue, and a dot-shaped light shutter made of liquid crystal arranged opposite to the three-color dot color filter. When the optical shutter opposed to the red filter is controlled to open, the light of the white light source 3 arranged on the back passes through the red filter to display red, and when the optical shutter opposed to the green filter is controlled to open, green is controlled. Displayed, blue is displayed when the optical shutter facing the blue filter is controlled to open, and white is displayed when all the optical shutters are controlled to open. A color image is displayed by these combinations. Since such a transmission type color liquid crystal panel is already well known, further description is omitted.

A diffusing plate 5 is provided on the back of the color liquid crystal display panel 11, and the light emitted from the white light source 3 is scattered by the diffusing plate 5 and the scattered light is given to the color liquid crystal display panel 11. The back side of the diffusion plate 5 is covered with a light source storage box 6, and a white light source 3 is provided inside the light source storage box 6.
Is attached. As the white light source 3, a white fluorescent tube that emits three wavelength components of red, green, and blue can be used. The reflector 4 is attached to the inner wall surface of the light source storage box 6 so that the light of the white light source 3 can be effectively incident on the color liquid crystal display panel 11.

On the other hand, in the present invention, the light guide plate 12 is arranged on the bottom of the light source storage box 6. The light guide plate 12 is formed of a transparent plate such as an acrylic resin plate. In the present invention, a concave portion is formed in the light guide plate 12, and the monochromatic light source 1 is formed in the concave portion.
3 is buried. The monochromatic light source 13 can be composed of a white lamp 13A and a color filter 13B covering the white lamp 13A. The color filter 13B can be formed by forming, for example, a green light-transmitting resin in a cap shape. Diffusion plate 1 having an uneven surface on the upper surface of light guide plate 12
4 are stacked. Along with this, the white light source 3 and the monochromatic light source 13
A light-shielding plate 15 is provided between the light-emitting device and the light-shielding plate 15 so that the light of the white light source 3 is not directly applied to the monochromatic light source 13.

According to the configuration of the present invention, when the white light source 3 is turned on, it operates as a color display, and can display a color image picked up by a color image pickup device, for example. In this case, since the light-shielding plate 15 is provided, the color filter 13B constituting the white light source 13 is not directly irradiated with white light. As a result, white light is transmitted through the color filter 13B, and green light is scattered through the light guide plate 12 and can be prevented from entering the color liquid crystal display panel 11.

On the other hand, the white light source 3 is turned off, and the monochromatic light source 13 is turned off.
Is turned on, monochromatic light determined by the color of the color filter 13 </ b> B is emitted from the monochromatic light source 13 to the light guide plate 12, and the monochromatic light enters the color liquid crystal panel 11 through the diffusion plate 14. At this time, the color liquid crystal device 11 can display a single color image by controlling the opening and closing of only the light shutter portion of the color corresponding to the emission color of the single color light source 13. Especially monochromatic light source 1
By selecting the spectral characteristics of the color filter 13B constituting the third component to the spectral characteristics required for the night vision device, it is possible to conform to the standard as a display of the night vision device. Therefore, it can be used as a display device of an infrared night-vision device.

In other words, if only a green image needs to be displayed, the white light source 3 is turned on, and only the green light shutter portion is opened and closed, whereby a green image can be displayed. However, if the white light of the white light source 3 is simply transmitted through the green filter portion of the color liquid crystal panel, the white light will be transmitted including light of a wavelength unnecessary for a night vision device. It deviates from the standard.

Therefore, in the present invention, when used as a display for a night-vision device, the monochromatic light source 13 is turned on, and only a wavelength component meeting the standard of the night-vision device is transmitted by the color filter 13B constituting the monochromatic light source 13, The light is applied to a color liquid crystal panel.

[0018]

As described above, according to the present invention, a color image display and a single-color image display for a night-vision device can be shared, which is convenient.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining a conventional technique.

[Description of sign]

 Reference Signs List 3 white light source 4 reflector 5 diffusion plate 6 light source storage box 11 color liquid crystal display panel 12 light guide plate 13 monochromatic light source 13A white lamp 13B color filter 14 diffusion plate 15 light shielding plate

Claims (1)

(57) [Scope of request for utility model registration] 1. A. First Embodiment B. a transmission type color liquid crystal display panel for displaying an image by transmitted light; B. a light source storage box that covers the back side of the color liquid crystal display panel; A reflector provided on the inner wall surface of the light source storage box; B. a light guide plate provided along the bottom surface of the light source storage box; B. a monochromatic light source embedded inside the light guide plate; G. a diffusion plate provided on the surface of the light guide plate; B. a white light source provided between the diffusion plate and the color liquid crystal display panel; A blocking plate for preventing the light of the white light source from being directly irradiated on the single-color light source.