Display unit and scanning method therefor

Abstract

A display unit, which allows a coherent light to scan on a screen to display an image, is required to rotate a polygon mirror at an ultra-high speed when a high-resolution image is to be displayed such as in the case of HDTV thus requiring the use of a high-performance polygon mirror, and poses noise and power consumption problems when a polygon mirror is rotated. Inserting multi-reflection-use mirrors (6a), (6b) in a coherent-light scanning optical system can provide a plurality of scanning lines while one plane of a polygon mirror (5) scans a coherent light as many as one line to thereby lower the rotation speed of the polygon mirror.

Description

technical field [0001] The present invention relates to a display device and scanning method for projecting coherent light onto a screen or through the screen to project images. Background technique [0002] As a conventional display device using coherent light, for example, a display device using a spatial modulation element such as the display device described in Patent Document 1 is known. Furthermore, in addition to the display device described in the above-mentioned Patent Document 1, as shown in FIG. 7( a ), there is a display device that projects coherent light onto a screen using a polygon mirror. A conventional laser display device shown in FIG. 7(a) will be described below. [0003] FIG. 7(a) is a diagram showing a schematic configuration of a conventional laser display device. [0004] This laser display device 100 includes laser light sources 101a to 101c corresponding to the three colors of RGB and light modulators 106a to 106c for intensity-modulating laser b...

AI Technical Summary

Problems solved by technology

[0012] That is, regarding the rotation speed of the polygon mirror, under the situation that the face number of the polygon mirror is fixed as 20 faces, the rotation speed (RPM)=1125 (bar)*30 (time)*60 (second)÷20 (face)=approximately 10 Ten thousand (RPM), but in order to achieve such a high-speed rotation, not only must use a high-performance polygon mirror, but also must have a high-performance motor and a high-durability motor bearing. Furthermore, in the case of making it rotate at such a high speed , in addition to the increase in noise during rotation, there is also a problem that the power consumption of the motor also increases

[0013] In addition, it is also conceivable not to increase the rotational speed of the polygon mirror, but to increase the number of scanning lines by increasing the number of faces of the polygon mirror, but in the case of increasing the number of faces of the polygon mirror, the size of the polygon mirror itself becomes larger, resulting in Difficult miniaturization of laser display devices

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