JPH04181289A - Picture display device - Google Patents

Abstract

PURPOSE:To accomplish uniform picture display all over a picture element by performing two-dimensional scanning with light beams emitted from three light emitting bodies which emit different color respectively and displaying two-dimensional image. CONSTITUTION:A light emitting body driving means 2 fetches picture element data 102, 103 and 104 according to a picture element data transfer control signal 105, and allows a light emitting means 3 to emit the light beam by setting timing that a light emitting timing signal 101 is given as reference. The means 3 is constituted of three light emitting bodies 4 which output red, green and blue, and the respective light emitting bodies 4 emit the light beam according to the data 102, 103 and 104. An image-formation optical means 5 is adjusted to give the proper virtual image of two-dimensional image to an observer 13 by receiving the respective output light beams from the light emitting bodies 4. A 1st deflecting means 6 controls a deflection angle like a galvano mirror or a polygon mirror by a synchronizing control means 8 so as to perform linear scanning with the spot light.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display device that displays two-dimensional images.

[Conventional technology] Conventional image display devices use cathode ray tubes (hereinafter referred to as CRTs) that display images by shining electron beams onto a fluorescent screen, or use light from a light source placed at the rear by opening and closing liquid crystal shutters. Two-dimensional display bodies are mainly used, as typified by liquid crystal panels that display images by transmitting or blocking light.

On the other hand, as described in Japanese Patent Application Laid-Open No. 2-42476, a line of light emitted from a light source arranged in a straight line is reflected using a vibrating mirror, and the direction of reflection is perpendicular to the line of light. There is a display device that displays a two-dimensional image by shifting the image little by little.

[Problem to be Solved by the Invention] In the display device described in JP-A-2-42476, when coloring the screen, a plurality of light emitting diode arrays each emitting light of a different color are used, and the The output lights are combined and arranged in a straight line.

When such a configuration is used, various problems arise as the density of light emitters on the array increases or as the number of light emitters increases.

The first problem is that when arranging a plurality of light emitting diodes, the light emitters forming the same pixel must be correctly matched and overlap each other accurately on the pixel. However, as the density of the light emitters increases or the number of light emitters increases, the distance between the light emitters on the array and the linearity of the rows of light emitters become larger compared to the pixel pitch. For this reason, even if one location in the array is accurately matched, positional deviations occur at other locations, resulting in a problem that pixels are blurred. The second problem is increased variation in the output of the light emitters. - As a practical countermeasure, a method is adopted in which the output of each light emitter is measured in advance and the driving conditions are changed for each light emitter.

However, as the number of light emitters increases, the problem becomes extremely complicated.

[Means for Solving the Problems] The image display device of the present invention includes a light-emitting means having three types of light-emitting bodies each emitting light of a different color for displaying an image;
a light emitter driving means for driving the light emitting means; a first deflection means for deflecting the output light of the light emitting means; and a second deflection means for further deflecting the output light deflected by the first deflection means. a deflection means, an image information processing means for processing image information sent to the light emitter driving means, and a synchronization control means for synchronizing the first deflection means, the second deflection means, and the image information processing means. , and an imaging optical means for imaging the output light of the light emitting means.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

Image information 100 is a target image to be displayed on the image display device of the present invention. The target images include, for example, characters, numbers, and figures displayed on a computer's output device, images that are first stored in an image memory and then output, and video signals output from a video deck, electronic still camera, etc. can be mentioned.

The image information processing means 1 generates a light emission timing signal 101 for causing the light emitting means 3 to emit light based on the image information 100;
Pixel data 102 corresponding to red, green, and blue components of each pixel
．． 103 and 104, a pixel data transfer control signal 105 for transferring each pixel data to the light emitter driving means 2, a deflection synchronization signal 106 for synchronously controlling the first deflection means 6, and synchronously controlling the second deflection means 7. Deflection synchronization signal 107 for
Output. Here, if the target image is a binary image,
Each pixel data has two types: "emission" (temporarily assumed to be !1111) and "non-emission" (temporarily assumed to be 11011).

The synchronization control means 8 generates a drive signal 108 for driving the first deflection means 6 and a drive signal 109 for driving the second deflection means 7 based on the deflection synchronization signal 106 and the deflection synchronization signal 107, respectively. and output.

The light emitter driving means 2 takes in pixel data 102, 103, and 104 according to the pixel data transfer control signal 105,
The light emitting means 3 is caused to emit light based on the timing given by the light emitting timing signal 101.

The light emitting means 3 is composed of three light emitters 4 that output red, green, and blue, and each light emitter 4 outputs pixel data 102.
．． 103.104.

The imaging optical means 5 receives each output light from the light emitter 4 and is adjusted to provide an appropriate two-dimensional virtual image to the observer 13.

The first deflection means 6 is, for example, a galvanometer mirror or a polygon mirror whose deflection angle can be controlled by the synchronization control means 8, and linearly scans the spot light.

This operation corresponds to horizontal scanning when compared to a CRT.

The light linearly scanned by the first deflection means 6 further enters the second deflection means 7. Similarly to the first deflection means 6, this also uses a device whose deflection angle can be controlled by the synchronization control means 8. The second deflection means 7 scans the linearly scanned incident light in a direction perpendicular to the linearly scanned incident light, and forms a two-dimensional image 110 as a result. This operation can be compared to a CRT.
It supports vertical scanning.

There are two scanning directions for the screen by the first deflection means 6 and the second deflection means 7 as follows.

(1) The first deflection means 6 is horizontal, and the second deflection means 7 is vertical.

(2) The first deflection means 6 is directed vertically, and the second deflection means 7 is directed horizontally.

Figure 2 shows the light emitting means 3 and the imaging optical means 5 in this embodiment.
, an example of the arrangement of the first deflection means 6 and the second deflection means 7.

The optical path of the light output from the three light emitters 4a, 4b, and 4c is corrected by the lens 9. At this time, the optical paths from each of the three light emitters to the lens 9 are arranged to be equal. Further, the lens 9 is arranged so that the observer 12 can observe a virtual image of an appropriate size.

The light passing through the lens 9 is two-dimensionally scanned by the reciprocating reflectors 10 and 11 as described above, and the light passes through the observer's eye 1.
2.

Here, the three light emitting bodies 4 are arranged perpendicularly to the rotation axis of the reciprocating reflector 10 as shown in FIG. The output lights of the body 4 overlap to form pixels. Specifically, when the reciprocating reflector 10 is rotating in the direction of the arrow, the light emitters 4a to 4 are moved at appropriate intervals.
This can be achieved by emitting light in order of b and 4c.

Various timings of the image processing means 1 and the light emitter driving means 2 will be explained below based on the image example shown in FIG. 4. Note that the numbers 200 to 215 in FIG. 4 represent pixel numbers.

FIG. 5 shows a timing example when emitting light is emitted in the order of pixel numbers starting from pixel 200 in the embodiment shown in FIG.

In the figure, T1 is the reciprocating period of the second deflecting means 7, T2 is the time required for the deflection direction to return from the lower end of the screen to the upper end due to the operation of the second deflecting means 7, and T3 is the reciprocating period of the first deflecting means 6. The period T4 represents the time required for the deflection direction to return from the right end of the screen to the left end due to the operation of the first deflection means 6, respectively.

Each pixel data is latched at the timing of the rising edge of the pixel data transfer control signal 1.degree. This order is based on the case where the light emitters are arranged as shown in FIG. 3 and emit light when the reciprocating reflector 10 moves as indicated by the arrow. Each light emitter 4a, 4b, 4
The light emission timing interval T5 between 0 and 0 is set so that the observer 12 feels that each light emitting body is emitting light at the same point. When the pixel 203 finishes emitting light from the pixel 200, it waits for T4, then starts displaying from the pixel 204, and thereafter the pixel 2
Continue the same operation until 15. When the display up to pixel 215 is completed, the first deflection means 6 and the second deflection means 7 return to the left end and the upper end of the screen, respectively, before displaying the next screen data.

FIG. 6 shows a timing example when both the first deflection means and the second deflection means use rotary movement type reflectors as shown in FIG. 7. Here, T6 and T7 are respectively second deflection means;
This is the period at which the reflecting mirror of the first deflecting means switches, and in the case of a device with eight reflecting surfaces as shown in Fig. 7, it is the rotation period of 8.
This corresponds to 1/1. Further, T8 is a time interval corresponding to T5 in FIG.

[Effects of the Invention] As described above, according to the present invention, a two-dimensional image is displayed by two-dimensionally scanning the light emitted from three light-emitting bodies that each emit a different color. After mechanical and optical position adjustment between the light emitters and emission intensity adjustment are performed, it is possible to display a high quality and uniform image over all pixels.

Furthermore, a single light emitter has a simpler structure than a light emitter array, is easier to manufacture, and has a higher output, so its use has the effect of providing a brighter and more stable image.

Furthermore, since optical components such as a dichroic prism or a half mirror are not required when combining the output lights of the respective light emitters, it also has the effect of helping to reduce the size and weight.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is an explanatory diagram of the arrangement of the embodiment shown in FIG. FIG. 3 is an explanatory diagram of the arrangement of the light emitter and the first deflection means. FIG. 4 is a diagram showing an example of an image for explaining operation timing. FIG. 5 is a diagram showing an example of the operation timing of the image information processing means and its peripheral means. FIG. 6 is a diagram showing another example of operation timing of the image information processing means and its peripheral means. FIG. 7 is an outline drawing showing an example of a rotary movement type reflecting mirror. 1... Image information processing means 2... Light emitter driving means 3... Light emitting means 4... Light emitter 6... First deflection means 7... Second deflection means 8... Synchronous control Applicant with more than means Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki (and 1 other person) Figure 2 Figure 4

Claims (1)

[Claims] (a) Three luminescent colors each emitting different colors for displaying an image
(b) a light emitting body driving means for driving the light emitting means; (c) a first deflection means for deflecting the output light of the light emitting means; (d) ) a second deflection means for further deflecting the output light deflected by the first deflection means; (e) an image information processing means for processing image information sent to the light emitter driving means; 1 deflection means, a synchronization control means for synchronizing the second deflection means and the image information processing means, and (g) an imaging optical means for forming an image of output light from the light emitting means. An image display device characterized by: