Apparatus and method for detecting colour ring rotation of projection type image display

Abstract

The invention relates to a color circle rotation detecting device and method for a projection image display device, comprising the following parts of: chroma filter; color circle arranged in the central cylinder part of each delimitation of the chroma filter; optical detector for detecting each index identification as the color circle rotates and outputting detected signal; delay time determining part for determining delay time of the smallest boundary needed for chroma signal conversion to respond the detected signal; and control part for controlling digital micro-reflector imaging chip by reflecting the light inputted to the chip to a light absorber in the period from the index identification detecting time to the delay time. And the invention can accurately detect varying time of the color circle chroma filter, thus able to minimize the boundary of a light shielding region formed at the time of chroma image signal conversion.

Description

technical field [0001] The present invention relates to a color ring rotation detection device and method, in particular to a method for automatically detecting the change time of a chroma filter when the color ring used in a projection image display device rotates, so as to shield the light generated when the color changes. A color ring rotation detection device and method for minimizing the margin of a mute) region. Background technique [0002] In recent years, with the development of the information industry, there has been an increasing demand for image display devices capable of displaying large screen images. Among projection image display devices that can display large screen images, digital light processing {DLP (Digital light Processing)} projectors using digital microreflective device {DMD (Digital Micro-mirror Device)} imaging chips are subject to people's attention. [0003] In recent years, with the development of projectors toward miniaturization and light w...

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Problems solved by technology

[0011] The marginal interval (M) is a relatively large interval set on the basis of the index mark and the arithmetic operation. The reason for setting the relatively large interval is that as mentioned above, only one is used to measure the rotation speed of the color ring in the conventional technology. The set index mark, so it cannot correctly measure the red (R), green (G), blue (B) three primary color chroma filter change time, so it is set to a larger interval

[0012] As mentioned above, if the margin interval (M) is set relatively large, light cannot be displayed in the interval, so not only the light use efficiency is reduced, but also there is a problem that the overall brightness of the digital light processing (DLP) projector is reduced

[0013] In addition, after the unused light becomes scattered inside, it not only changes the internal heat of the system, but also has the problem of increasing the possibility of causing interference to the projection on the screen.

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