Illuminating apparatus of light emitting diode

Abstract

This invention provides a LED illumination device used in projectors, which takes three spectrums of red, green and blue monochromatic irradiance diode arrays to form a diode panel emitting light from three sides as the light source of the projector, then uses a synthesized prism to merge them to a beam generated by the three LED panels and outputs images with a lens component, which not only can solve the problem that a super high voltage Hg lamp used in a traditional projector generates thermo-radiation and harms the machine and other optical elements but also can simplify the complicated optical system.

Description

[0001] This application is a divisional application with a filing date of October 22, 2003 and an application number of 200310102865.0. (1) Technical field [0002] The present invention relates to an illuminating device, in particular to an LED illuminating device used in a projector as a light source. (2) Background technology [0003] With the prevalence of multimedia presentations, the projector has become one of the necessary computer equipment in the office. Quantization, high image quality, low noise and long light source life to meet the convenience and needs of popular use. [0004] FIG. 1 is a schematic diagram of the structure and optical path of a conventional projector 100 . Its structure is mainly composed of an illumination system, a light separation and synthesis system and an imaging system. The lighting system includes an ultra-high pressure mercury lamp (UHP mercury lamp, Ultra High Pressure mercury lamp) 101, a parabolic reflector (reflector) 103, an ul...

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Problems solved by technology

In addition, conventionally, the light source used in the lighting system of the projector 100 is an ultra-high pressure mercury lamp 101 in the form of a high-intensity discharge arc bulb. Since the light spectrum produced by this ultra-high pressure mercury lamp 101 is relatively weak in the red frequency band, the When designing the light splitting and synthesizing system, the ratio of red light, green light and blue light must be reconsidered in order to make the output image color balance, which increases the structural complexity of the entire projector 100. Therefore, there is an urgent need for a high spectrum purity and structure A simple lighting device replaces the ultra-high pressure mercury lamp 101 used in the conventional projector 100

Furthermore, since the lighting system of the conventional projector 100 adopts an ultra-high pressure mercury lamp 101, it is necessary to cooperate with the refracting mirror groups 115, 117, 119 and 121 and the dichroic mirror groups 131 and 133 in the light-combining system to combine the ultra-high pressure mercury lamps. The white light generated by the high-pressure mercury lamp 101 is separated into three primary colors of red, blue and green, and then combined by the light-combining prism 135 to output an image. Therefore, the optical path design of the projector 100 must be very precise. When the projector 100 is in the manufacturing process When the optical path is poorly assembled or affected by external mechanical forces such as vibration or transportation during operation, this complex optical path design is likely to be displaced or damaged due to a certain optical element, which will affect the projection quality of the projector 100; therefore, an improved one is urgently needed. The projector provides a simplified optical path structure, reduces the number of optical components in the conventional projector 100 to improve the reliability and stability of the projector 100 during operation

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