JPH056430U - Monochromatic-color dual-use liquid crystal display device - Google Patents

Abstract

(57) [Summary] [Object] To obtain a monochromatic-color liquid crystal display device which can be used as both a monochromatic display device for a night-vision device and a color display device. [Structure] A color liquid crystal display panel that displays a color image by transmitted light, 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, and a light source storage box. The light guide plate provided along the bottom surface, the monochromatic light source embedded in the light guide plate, the white light source provided between the light guide plate and the color liquid crystal panel, and the light of the white light source is directly irradiated to the monochromatic light source. And a light-shielding plate that prevents the above.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a monochromatic-color liquid crystal display device that operates as a color image display device as required and also as a display device of an infrared night-vision device.

[0002]

[Prior Art]

 An infrared night-vision device has been put into practical use as a device for searching at night. A monochromatic display is used as the display of this infrared night-vision device. In other words, in a night-vision device, in the dark, it is necessary to see the image of the night-vision device together with many instruments. For this reason, it is stipulated that the display should be performed, for example, at a light amount below a certain level of green, so that the other instruments are restricted by the same standard.

FIG. 2 shows an example of a display for a conventional infrared night-vision device. Reference numeral 1 in the figure denotes a liquid crystal display panel. As the liquid crystal display panel 1, a so-called transmissive liquid crystal display panel is used in which light emitted from a light source 3 provided behind is intermittently interrupted by an optical shutter made of liquid crystal to display an image. A diffusion plate 5 is laminated on the back surface of the liquid crystal display panel 1 so that the light emitted from the light source 3 is scattered and uniform light is incident on the liquid crystal display panel 1.

The light source storage box 6 covers the back of the diffuser plate 5, 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 from the light source 3 is effectively reflected and made incident on the liquid crystal display panel 1. An ordinary white fluorescent lamp can be used as the light source 3, and the light passing through the liquid crystal display panel 1 is transmitted only by the green filter 2 laminated on the upper surface of the liquid crystal display panel 1. Therefore, the image is displayed in one green color, and unnecessary wavelength components of light are removed by the green filter 2 to meet the standard as a night-vision device.

[0005]

The conventional infrared night-vision device is designed to be used only at night. However, due to recent technological advances in the field of image pickup devices, the image captured by the image pickup device can be seen farther than it is visible in the daytime, making it convenient for searching. For this reason, there has been a demand for 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 night.

In order to satisfy this demand, first, in the structure of the conventional display device, the liquid crystal display panel 1 is used as a liquid crystal panel for color display, and in order to perform color display, a green filter applied on the surface is used. I have to remove 2. When the green filter 2 is removed, a monochromatic image display function that meets the standard of the night-vision device must be realized instead of the green filter 2.

An object of the present invention is to provide a monochromatic-color liquid crystal display device capable of displaying a monochromatic image without applying a green filter on the front surface of the liquid crystal display panel and realizing a color image display. It is what

[0008]

[Means for Solving the Problems]

 In this invention, a color liquid crystal display panel that displays a color image by transmitted light, 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, and a light source storage box. Between the diffuser plate and the color liquid crystal display panel, the light guide plate provided along the bottom surface of the light guide plate, the monochromatic light source embedded in the light guide plate, the diffuser plate provided on the surface of the light guide plate. A white-light source provided and a light-shielding plate that prevents the light of the white-color light source from directly illuminating the single-color light source constitute a single-color / color dual-use liquid crystal display device.

According to the configuration of the present invention, by turning on the white light source, 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, at this time, when the monochromatic light source is green, a green image can be displayed by controlling the opening and closing of only the green pixels of the color liquid crystal display panel.

Therefore, according to this invention, it is possible to display a monochrome image and a color image.

[0011]

【Example】

 FIG. 1 shows an embodiment of this invention. Reference numeral 11 in the figure denotes a color liquid crystal display panel. As is well known, this color liquid crystal display panel has pixels formed by three-color dot color filters of red, green, and blue, and a dot-shaped optical shutter made of liquid crystal arranged facing the three-color dot color filters. When the optical shutter facing the red filter is controlled to open, the light of the white light source 3 arranged on the back side is transmitted through the red filter to display red, and when the optical shutter facing the green filter is controlled to open, green light is emitted. Displayed, blue is displayed when the optical shutter facing the blue filter is controlled to open, and white is displayed when all optical shutters are controlled to open. A color image is displayed by these combinations. Since such a transmissive color liquid crystal panel is already well known, further description will be omitted.

A diffuser plate 5 is provided on the back surface of the color liquid crystal display panel 11, and the diffuser plate 5 scatters the light emitted from the white light source 3 to give the scattered light 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 the white light source 3 is mounted inside the light source storage box 6. The white light source 3 may be a white fluorescent tube that emits three wavelength components of red, green and blue. A reflection plate 4 is attached to the inner wall surface of the light source storage box 6 so that the light from the white light source 3 is effectively incident on the color liquid crystal display panel 11.

On the other hand, in this invention, the light guide plate 12 is arranged on the bottom surface of the light source storage box 6. The light guide plate 12 is composed of a transparent plate such as an acrylic resin plate. In this invention, a concave portion is formed in the light guide plate 12, and the monochromatic light source 13 is embedded in the concave portion. The monochromatic light source 13 can be constituted by 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 transmissive resin in a cap shape. A diffusion plate 14 having an uneven surface is laminated on the upper surface of the light guide plate 12. At the same time, a light blocking plate 15 is provided between the white light source 3 and the monochromatic light source 13, and the light blocking plate 15 prevents the light of the white light source 3 from directly illuminating the monochromatic light source 13.

According to the configuration of the present invention, when the white light source 3 is turned on, the white light source 3 operates as a color display device, and for example, a color image captured by a color imaging device can be displayed. 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, it is possible to prevent the white light from passing through the color filter 13B and the green light from scattering through the light guide plate 12 and entering the color liquid crystal display panel 11.

On the other hand, when the white light source 3 is turned off and the monochromatic light source 13 is turned on, monochromatic light determined by the color of the color filter 13 B is emitted from the monochromatic light source 13 to the light guide plate 12, and this monochromatic light is colored through the diffusion plate 14. It is incident on the liquid crystal panel 11. At this time, the color liquid crystal device 11 can display an image of a single color by controlling the opening / closing of only the light shutter portion of the color corresponding to the emission color of the monochromatic light source 13. In particular, by selecting the spectral characteristic of the color filter 13B constituting the monochromatic light source 13 as the spectral characteristic required by the night-vision device, it is possible to meet 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 it is only necessary to display the green image, the white light source 3 is turned on, and the green image can be displayed by controlling the opening / closing of only the green optical shutter portion. 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, it will also transmit light of a wavelength unnecessary for a night vision device. The display is out of specifications.

Therefore, in this invention, when used as a display for a night-vision device, the monochromatic light source 13 is turned on, and the color filter 13B constituting the monochromatic light source 13 allows only wavelength components that meet the standard of the night-vision device to pass through. It is configured to give the light to the color liquid crystal panel.

[0018]

[Effect of the device]

 As described above, according to the present invention, the color image display and the monochromatic image display for the night vision device can be used together, which is convenient.

[Brief description of drawings]

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

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

[Explanation of sign]

 3 White light source 4 Reflector 5 Diffuser 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 Diffuser 15 Light-shielding plate

Claims (1)

[Claims for utility model registration] [Claim 1] A. A transmissive color liquid crystal display panel for displaying an image by transmitted light; and 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, and D. A light guide plate provided along the bottom surface of the light source storage box, and E. A monochromatic light source embedded inside the light guide plate; A diffusion plate provided on the surface of the light guide plate, and G. A white light source provided between the diffusion plate and the color liquid crystal display panel; A monochromatic-color liquid crystal display device constituted by a blocking plate that blocks the light of the white light source from directly irradiating the monochromatic light source.