Projection device

Abstract

A projection device comprises a first display, a second display, a third display, a light combination module, a first angle selector, a second angle selector, a third angle selector and a projection lens. The first display, the second display and the third display are respectively used for providing a first image light beam, a second image light beam and a third image light beam. The projection lens is arranged on one side of the light emitting surface of the light combining module and is used for projecting the first image light beam, the second image light beam and the third image light beam out of the projection device. The first image light beam, the second image light beam and the third image light beam pass through the first angle selector, the second angle selector and the third angle selector respectively and then are transmitted to the projection lens through the light combination module. According to the invention, stray light transmitted out of the projection device through the light combination module can be effectively reduced, so that the contrast ratio of a projection picture is increased.

Description

technical field [0001] The present invention relates to an optical device, and in particular to a projection device. Background technique [0002] The three-color combination projector using the Digital Light Processor (DLP) or Liquid Crystal On Silicon (LCoS) light valve (Light Valve) system requires a light source device with a complex optical system, resulting in a large volume . The advantage of using a three-piece micro LED panel with a light-combining system is that the size of the projection device is reduced. [0003] However, the biggest problem of the three-piece micro-LED display panel with the light combining system is that the light-emitting angle of the micro-LEDs is large. The method that can reduce the angle is to add a reflector and use a micro-light emitting diode array (ie, a micro-optical array), but the limit of the light-emitting half angle can be reduced only 20 degrees (under the condition of a pixel size of less than 5 microns). Furthermore, in th...

AI Technical Summary

Problems solved by technology

Furthermore, in the case of limited luminous angle reduction, due to the large half-angle of luminous light and the total reflection inside the combined light system (the light greater than the effective light angle is only totally reflected inside the light combined module), thus causing invalid light to be introduced into the projection lens, Causes stray light to appear on the projection screen, affecting the contrast of the projection screen

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