Apparatus and method for detecting colour ring rotation of projection type image display
A technology for image display equipment and rotation detection, which is applied in the direction of cathode ray tube indicators, static indicators, instruments, etc., can solve problems such as projection interference, reduced brightness of projectors, and reduced light use efficiency, so as to improve use efficiency and improve The effect of full brightness, reducing the possibility of heat and interference with the picture
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[0037] Hereinafter, the embodiments of the present invention will be described in more detail with reference to the drawings.
[0038] Figure 2a It is a schematic block diagram of a color ring rotation detection device for a projection image display device according to an embodiment of the present invention; Figure 2b It is a detailed view of the color ring.
[0039] Refer to Figure 2a and Figure 2b It can be seen that the color ring rotation detection device of the projection-type image display device is composed of the following parts: a set of two red (R), green (G), and blue (B) chromaticity filters and A color ring 10 including 6 index marks 12 is set at a predetermined position corresponding to the cylinder part of the delimiting line of each chromaticity filter; when the color ring rotates, each index mark 12 is detected and the detected signal is outputted as a light detection 14; In response to the index mark detection signal input by the photodetector, the delay time...
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