JPS61165785A - Display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display device having a CRT screen and a liquid crystal screen.

[Conventional technology]

Since the liquid crystal itself is not a light emitting body, in conventional display devices using liquid crystals, a light source is provided for the liquid crystal display and illumination is performed from the front surface of the liquid crystal and the reflected light is used to display the image, or illumination is performed from the back side of the liquid crystal. It was displayed using the transmitted light.

[Problem that the invention seeks to solve]

However, by using a gold film as a light source for liquid crystal display, the display device becomes complicated and space is required for the light source, making it difficult to miniaturize the display device.

Especially the LCD screen? When installed together with other devices such as a CRT, the above problems become even more serious.

An object of the present invention is to provide a display device in which a CRT screen and a liquid crystal screen are provided together, which does not require any light source for liquid crystal display.

[Failure to solve the problem]

First, the present invention will be explained in detail.

As shown in FIG. 5, the effective screen 1 of a CRT is generally formed at the center of the raster screen 2 on the panel 3, and the peripheral area 2a of the raster screen 20 is not used as the effective screen 1 because image distortion is likely to occur. Not used.

Therefore, in the present invention, the brightness of the peripheral area 2a of the raster screen 2 is increased, and this serves as a total light source to illuminate the liquid crystal screen attached to the CRT.

The display device of the present invention has a CRT screen and a liquid crystal surface, wherein the liquid crystal screen is a CRT screen.
The entire peripheral area of the raster screen is illuminated as a light source.

〔Example〕

An embodiment of the present invention will be described below with reference to all the drawings.

FIG. 1 is a plan view of a screen of a display device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along cutting plane XX in FIG. 1. The light guide plate 4 is made of acrylic material or the like and is attached to a CRT.
The liquid crystal 5 is installed on the light guide plate 4 so that one side of the panel 3 whose cross section is cut diagonally overlaps the raster screen 20 periphery s2a.

Next, the operation of this embodiment will be explained with full reference to FIG. 3.

FIG. 3 is an enlarged view of the junction Y between the CRT screen and the liquid crystal screen in FIG. The brightness of the peripheral part 2a of the raster screen 2 is set high in advance by a control device (not shown) in the CRT, and a high-energy electron beam is irradiated onto the fluorescent surface 6 of the peripheral part 2a of the raster screen 2. Light is emitted from the fluorescent surface 6. After passing through the panel 3, this light enters the light guide plate 4, is reflected by the oblique cut surface 4a, and travels inside the light guide plate 4. Further, this light is diffusely reflected at various parts of the light guide plate 4 due to impurities in the material made of the light guide plate 4t and non-uniformity of the material, and enters the liquid crystal 5.

In this way, the liquid crystal 5 is illuminated from the back side as a light source at the peripheral area 2ak of the raster screen 2 of the CRT.

FIG. 4 shows another embodiment.

A liquid crystal screen is provided between two CRTs, and a light guide plate 1 is installed so as to span the panels 13 and 23 of the two CRTs.
4 is installed, and furthermore, a liquid crystal 15 is installed above it. Note that the cross section of both ends of the light guide plate 4 that is joined to the panel 13.23 is cut diagonally as shown in FIG.
Since the entire peripheral area of the raster screen of both CRTs is used as a light source, the brightness of the surface of the liquid crystal 15 is made uniform, and a higher quality liquid crystal image can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, a liquid crystal image can be obtained in a display device in which a CRT screen and a liquid crystal screen are provided together, without providing a light source other than the liquid crystal display. Furthermore, by suppressing the peripheral areas of the CRT's raster screen through software processing by a microcomputer circuit, it is possible to achieve complete color changes on the same LCD screen.
It is possible to create a partial color distribution on the LCD screen ■
It is possible to control the shading of the liquid crystal image ■In addition to the ability to control the color and shading to give the liquid crystal screen movement, it is also possible to control the periphery of the raster screen, which was an unnecessary part of conventional CRTs. It can be used effectively.

[Brief explanation of the drawing]

1 is a plan view of a screen of a display device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along cutting plane XX in FIG. 1, and FIG. 3 is an enlarged view of the joint Y in FIG. FIG. 4 is another embodiment, and FIG. 5 is an explanatory diagram of a CRT screen. 1... Effective screen, 2... Raster screen 2a... Peripheral area, 3, 13.23... Panel, 4.14...・Light guide plate, 5.15...Liquid crystal, 6...fluorescent surface.

Claims (1)

[Claims] 1. A display device having a CRT screen and a liquid crystal screen, wherein the liquid crystal screen is illuminated using a peripheral area of a raster screen of the CRT as a light source.