JPH02135331A - Color projector for computer - Google Patents

Abstract

(57) [Abstract] 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 color projector for a computer that projects a color image based on a color image signal from a computer onto an external screen.

[Prior Art] Fig. 5 is a block diagram showing a conventional computer color projector. In the figure, 1 is a computer color projector, and 2 is a color image projected by this computer color projector. This is an external screen. Further, 3 is a signal receiving means for receiving a color image signal from a computer, and 4 is a signal receiving means for controlling image formation and color processing based on the color image signal received by the signal receiving means 3 to generate a control signal for the cathode ray tube. A cathode ray tube display control means, 5 is a cathode ray tube that displays a predetermined color image according to a control signal from the cathode ray tube display control means 4, and 6 is a lens that enlarges and forms the color image displayed on the cathode ray tube 5 on the external screen 2. , the computer color projector 1 is constructed of these components.

Next, the operation will be explained. This color projector 1 for a computer receives a color image signal sent from a computer using a signal receiving means 3. The signal receiving means 3 that has received the color image signal transfers it to the cathode ray tube display control means 4, and the cathode ray tube display control means 4 controls image formation and color processing based on the color image signal. The cathode ray tube display control means 4 sends a control signal for the cathode ray tube 5 generated based on the result to the cathode ray tube 5, and the cathode ray tube 5 displays a predetermined color image on its screen in accordance with this control signal. The color image displayed on the screen of the cathode ray tube 5 is enlarged and formed onto the external screen 2 by the lens 6, and in this way, the color image based on the color image signal from the computer is projected onto the external screen 2.

[Problem to be solved by the invention]

Conventional color projectors for computers are configured as described above, and are not only limited by the size reduction and cost reduction caused by cathode ray tubes, but also have problems such as being able to display only low brightness and unclear color images. In addition, as an approximate known technique, Utility Model Application No. 61-1588
There is something listed in No. 5.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a color projector for a computer that can display clear color images and is inexpensive and compact.

[Means to solve the problem]

A color projector for a computer according to the present invention includes:
Translucent elements whose transmitted light amounts of red, green, or blue are controlled in accordance with control signals from the color display control means are arranged in a predetermined order, and these translucent elements produce color images according to the control signals from the color display control means. A color image display panel that displays a color image and a light source that irradiates the color image display panel with light are provided instead of a cathode ray tube.

[Function] In the color projector for a computer according to the present invention, the color display control means controls the amount of transmitted light of each light-transmitting element of the color image display panel by a control signal generated based on a color image signal from the computer, and displays a color image. A color image corresponding to the color image signal from the computer is displayed on the display means, and a light source emits light from behind the color image display means on which this color image is displayed, and the color image is displayed on the external screen by the action of the lens. A color image is formed on the image display panel.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 2 is an external screen, 3 is a signal receiving means,
Reference numeral 6 denotes a lens, which is the same or equivalent to the conventional lens shown in FIG. 5 with the same reference numerals, so a detailed explanation will be omitted. Reference numeral 7 denotes a color display control means for controlling image formation and color-related processing to generate a predetermined control signal based on the color image signal received by the signal receiving means 3; 8, this color display control means 7; a color image display panel that displays a color image according to control signals from the
A light source 9 is placed behind the color image display panel 8 and illuminates the color image display panel with white light.

10 are these signal receiving means 3, color display control means 7,
This is a color projector for a computer according to the present invention, which is composed of a color image display panel 8, a light source 9, and a lens 6.

FIG. 2 is a configuration diagram showing a schematic configuration of the color image display panel 8. In the figure, numerals 11 indicate color electrochromism elements as light-transmitting elements, each of which transmits red light, green light, or blue light. , is a light-transmitting element whose amount of transmitted light can be electrically controlled. The color image display panel 8 has color electrochromism elements 11 arranged in a matrix in a predetermined order for each color, and an example of this arrangement is shown in FIG. In FIG. 3, the red color electrochromism element 11r, the green color electrochromism element 11g, and the blue color electrochromism element flb are arranged in a matrix without being continuous vertically or horizontally, respectively.

Next, the operation will be explained. This computer color projector 10 receives color image signals sent from a computer at the signal receiving means 3, as in the conventional case. Signal receiving means 3 receiving the color image signal
transfers it to the color display control means 7. Based on the color image signal, the color display control means 7 executes image formation processing and controls its display, and also executes color-related processing and controls its display. As a result, the color display control means 7 generates a control signal for controlling the amount of light transmitted through each color electrochromism element 11 of the color image display panel 8 and sends it to the color image display panel 8. In the color image display panel 8, the amount of transmitted light of each color electrochromism element 11 is controlled according to the sent control signal, and a predetermined color image is displayed on the screen.

This color image display panel 8 has a light source 9 arranged on the back side.
According to the color image displayed on the screen, red, green, and blue transmitted light is sent to the lens 6 from each color electrochromism element 11 in a predetermined light amount. The lens 6 images it onto the external screen 2, so that an enlarged image of the color image based on the color image signal from the computer is obtained on the external screen 2.

Here, this color electrochromism element 11 has less light transmission loss than a liquid crystal, etc. Therefore, according to the color projector for a computer of this embodiment, a color image with high brightness and clear density changes can be projected externally. It can be obtained on screen 2.

In the above embodiment, the color electrochromism elements 11r and l1g of each color in the color image display panel 8
, llb are arranged in a matrix so that the same color does not continue vertically, horizontally, or horizontally as shown in Figure 3.
As shown in FIGS. (a) and (b), a small number (about 2) of color electrochromic elements 11r, l1g, and llb of the same color may be consecutively arranged vertically or horizontally, similar to the above embodiment. It has the effect of

(Effects of the Invention) As described above, according to the present invention, the amount of transmitted light of each light-transmitting element of the color image display panel is controlled by the control signal generated by the color display control means, and A color image is displayed according to the color image signal of the color image display panel, and a light source emits light from behind the color image display panel, and the color image on the color image display panel is formed on an external screen by the action of a lens. With this configuration, an inexpensive and compact color projector for a computer can be obtained, which can display clear color images with high brightness.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a color projector for a computer according to an embodiment of the present invention, FIG. 2 is a block diagram showing a schematic configuration of the color image display panel, and FIG. 3 is a color electrochromism on the color image display panel. FIG. 4 is an explanatory diagram showing an example of an arrangement of elements, FIG. 4 is an explanatory diagram showing another example of an arrangement of color electrochromic elements on a color image display panel, and FIG. 5 is a block diagram showing a conventional color projector for computers. be. 2 is an external screen, 3 is a signal receiving means, 6 is a lens,
7 is a color display control means; 8 is a color image display panel;
9 is a light source, 10 is a computer color projector,
11°r. 1 g. b is a translucent element (color electrochromism element). In the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation

Claims (1)

[Claims] a signal receiving means for receiving a color image signal from a computer; a color display control means for controlling image formation and color-related processing based on the color image signal received by the signal receiving means and generating a predetermined control signal; Light-transmitting elements whose amount of transmitted light of a predetermined color is controlled in accordance with the control signal from the color display control means are arranged in a predetermined order, and the light-transmitting elements control the amount of transmitted light of a predetermined color according to the control signal from the color display control means. a color image display panel that displays a corresponding color image, a light source that irradiates the color image display panel with light, and a lens that focuses the color image displayed on the color image display panel on an external screen. A color projector for computers.