Light-emitting device and projection apparatus
A light-emitting device and filter device technology, applied in the optical field, can solve the problems of short service life, low red phosphor efficiency, low image display quality, etc., and achieve the effect of optimization of compromise and overall performance
Active Publication Date: 2013-01-02
APPOTRONICS CORP LTD
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Problems solved by technology
[0005] However, the problem with this solution is that the efficiency of the red phosphor is too low, and the service life is too short, so that red light becomes the bottleneck of the efficiency and life of the entire light source system
It can be imagined that the smaller the half-angle of the light cone, the larger the size of the spot, and the larger the spoke light, the lower the image display quality
Method used
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[0027] Through experiments, the inventor obtained that under the premise of achieving the same red light color coordinates figure 1 The relationship between the filtered red light luminous flux of the yellow light spectrum and the spot size of the incident light is shown, as shown in Figure 4 shown. Among them, 401 refers to the relative spot size and the relative brightness of red light when the half angle of the incident light cone incident on the filter is 10 degrees, and 402 to 409 respectively refer to the incident light cone incident on the filter. The half angle is the relative spot size and the relative brightness of red light at 20 degrees, 25 degrees, 30 degrees, 40 degrees, 45 degrees, 50 degrees, 60 degrees, and 70 degrees. It can be seen from the figure that when the half-angle of the incident light cone is between 10 degrees and 25 degrees, the relative spot size is large and the relative brightness of red light is not significantly improved, while when the hal...
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Abstract
The invention provides a light-emitting device and a projection apparatus. The light-emitting device comprises an exciting light source, a wavelength conversion device, a driving device and a light filtering device, as well as a light collection device, wherein the exciting light source is used for emitting exciting light, the wavelength conversion device is used for receiving the exciting light and emitting excited light and at least comprises a red light section, the driving device is used for driving the wavelength conversion device to periodically move relative to the exciting light, the light filtering device moves synchronously to the wavelength conversion device, the light filtering device at least comprises a red light filtering section corresponding to the red light section, the red light filtering section filters the light emitted from the red light section into red light, the light collection device is used for collecting and converging light emitted from the wavelength conversion device and enabling the incident angle of the light, entering the light filtering device, to be larger than or equal to 25 degrees and smaller than or equal to 45 degrees. According to the light-emitting device and the projection apparatus, both luminous flux of the red light and image display quality are achieved by optimizing and controlling the range of incident angles of light entering the light filtering device.
Description
technical field [0001] The invention relates to the field of optical technology, in particular to a light emitting device and a projection device. Background technique [0002] At present, projection display has attracted more and more attention. At present, the mainstream projection display technology uses a digital micromirror device (Digital Micromirror Device, DMD) as a light valve to modulate a sequential monochromatic light sequence, and obtains the timing on the screen by synchronizing with the timing of the monochromatic light sequence. Monochromatic light images, and finally rely on the visual residual effect of the human eye to superimpose each monochromatic light image to form a color image. [0003] In this projection display technology, the formation of time-sequential monochromatic light sequences is a key technology. One method is to use a white light source to focus on a filter disc, and the filter disc is distributed with a plurality of color filters along...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G03B21/14G03B21/20F21V9/10F21V9/40
CPCG03B21/20F21V9/10G03B21/14F21K9/56F21K9/58F21K9/64F21K9/65G02B7/08G03B11/00G03B21/204G03B33/08H04N9/3114H04N9/3158
Inventor 杨毅
Owner APPOTRONICS CORP LTD