JPS63121824A - Projection type color display device - Google Patents

Abstract

PURPOSE:To simplify the structure of a projection type color display device without decreasing its display performance by performing image display control by a color control element which performs selective transmission control over three red, green, and blue and a liquid crystal panel which controls the quantity of light transmission uniformly in the visible light range. CONSTITUTION:The color of light from a light source 1 is selected by the color control element 2 to transmit one of red, green, and blue light beams, the quantity of the light transmitted selectively through the light control element 2 is adjusted by the liquid crystal panel to add brightness information, and a display image is projected on a screen through a lens 4. Respective picture elements repeat red, green, and blue in order at a specific period to make a full-color display. The light control element 2 can transmits the red, green, and blue light beams selectively and utilizes the electric control interference effect of liquid crystal. A method for displaying a color image uses a method for repeating images of red, green, and blue at every image plane or a method which displays respective picture elements of red, green, and black in mosaic and repeating red, green, and blue at the specific period. Consequently, the number of components is decreased greatly and the device is miniaturized and the weight of the device can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a projection type color display device for enlarging and projecting characters, figures, and images.In particular, the present invention relates to a projection type color display device that uses a liquid crystal panel as a light shutter. Regarding.

[Conventional technology]

A conventional projection type color display device is one that uses a cold cathode tube to enlarge and project images; it is commercially available as a projection television. Due to the limitations of brightness changes caused by cold cathode tubes, sufficient brightness cannot be obtained with this cold cathode tube method.

As in Japanese Patent Application Laid-Open No. 60-179723, a liquid crystal panel is used as a light shutter, and each of the three liquid crystal panels is irradiated with red light, green light, and blue light to reproduce an image of each color. The object being enlarged and projected is the focus, and with this method you can obtain a sufficiently bright image by brightening the light source.

[Problem that the invention seeks to solve p]

However, the conventional technology mentioned above changes the light from the light source to blue.

It is necessary to separate the red and green light into red and green light.■It is necessary to combine the blue, red, and green images, which requires dedicated liquid crystal panels for blue, red, and green. This makes adjustment extremely difficult. ■Increase the number of optical parts. This causes the cost to increase.

The present invention is intended to solve these problems, and its purpose is to simplify the structure and reduce costs while maintaining the same display performance.

[Means for solving problems]

The projection type color display device of the present invention is intended to realize a full-color projection type color display device using a color control element that controls the color of transmitted light and a liquid crystal panel that controls the amount of transmitted light. is characterized in that it forms red, green, and blue images in a two-dimensional manner, and at the same time periodically transmits red, green, and blue light through any image.

[Effect]

According to the +2 structure of the present invention, image information can be displayed by controlling one color information using a color control element and controlling luminance information using a liquid crystal panel. Further, the color control element periodically transmits red light, green light, and blue light, and displays luminance information of each color on the liquid crystal panel in synchronization with the color control element, thereby enabling full-color display. By irradiating such image information with light from a light source and projecting it onto a screen using a lens, a full-color image can be obtained.

〔Example〕

FIG. 1 is a main configuration diagram of a projection type color display device according to an embodiment of the present invention, and is composed of a light source 1, a color control element 2, a liquid crystal panel 3, and a lens 4. The color of the light from the light source 1 is selected by the color control element 2, and one of red light, green light, and blue light is transmitted.The light quantity selectively transmitted by the light control element 2 is adjusted by the liquid crystal panel and the brightness is adjusted. Information is added.

The image thus displayed at 17 is projected onto the screen by the lens 4. Each pixel sequentially repeats red, green, and blue at a predetermined period to perform full-color display.

The light control element 2 is one that can selectively transmit red, green, and blue light, and one that utilizes the electrically controlled interference effect of liquid crystal is a good idea.

The liquid crystal panel may be a matrix liquid crystal panel using TN liquid crystal or ferroelectric liquid crystal, or an active matrix liquid crystal panel ht such as a diode transistor, α-day i, or M-device diode, but at present there is no contrast. Is it an active matrix LCD panel in terms of ratio, response speed, and gradation display? It's excellent.

As a method of displaying color images, ■ a red image for each screen,
How to repeat green and blue images, horizontal lines on one screen,
A possible method is to display red, green, and blue pixels in a vertical line or mosaic pattern, and to repeatedly change red, green, and blue at a predetermined period.

〔Effect of the invention〕

As described above, according to the present invention, a projection type color display device can be assembled from a light source, an e-control element, a liquid crystal panel, and a lens, and the number of parts can be greatly reduced. Furthermore, the device can be made smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is a main configuration diagram showing an embodiment of a projection type color display device. 2...Color control element 3...Liquid crystal panel or higher

Claims (1)

[Scope of Claims] 1) In a projection type color display device that controls light from a light source with a liquid crystal panel and projects an image displayed on the liquid crystal panel, a color that selectively transmits and controls the transmission of three colors, red, green, and blue. A projection type color display device characterized in that image display is controlled by a control element and a liquid crystal panel that uniformly controls the amount of transmission in the visible light region. 2) It is characterized by using a color control element in which red, green, and blue are repeatedly arranged according to the pixel spacing of the liquid crystal panel, and red, green, and blue light is transmitted at a predetermined period in any pixel within the display screen. A projection type color display device according to claim 1. 3) A projection type color display device according to claim 1, characterized in that an active matrix substrate in which active elements are arranged in a lattice pattern is used as a liquid crystal panel.