Total internal reflection color-combination prism and method for producing the same

Abstract

The invention provides a total internal reverse color-combination prism, which comprises a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a first surface, a second surface, a third surface, a first incident face, a second incident face, a third incident face and an emergent face, wherein the fourth interface is penetrated with red light and green light, and reflects blue light, the fifth interface is penetrated with the blue light and the green light, and reflects the red light. After being reflected by the first interface, the second interface and the third interface respectively, the red light, the green light and the blue light which are respectively incident via the first incident surface, the second incident surface and the third incident surface are transmitted by the first surface, the second surface and the third surface, an image input by the first surface is output by the exist face after being reflected by the fifth interface, an image input by the third surface is output by the emergent face after being reflected by the fourth interface, and an image input by the second surface is output by the emergent face after directly transmitting through the fourth interface and the fifth interface.

Description

technical field [0001] The invention relates to a color combining prism and a manufacturing method thereof, in particular to a total internal inversion color combining prism capable of coupling three primary color lights into a corresponding DMD and synthesizing images output by the DMD into a color image and a manufacturing method thereof. Background technique [0002] Single-chip DLP (digital light processing) projection systems currently used in the market such as figure 1 As shown, the white light emitted by the light bulb 101 passes through the color wheel 102 and outputs three colors of red, green and blue in time sequence. Reflection (TIR prism for short) is then irradiated onto a digital micromirror device 106 (Digital Micro-mirror Device, DMD for short), and the light beam processed by the DMD 106 passes through the projection lens group 107 and finally irradiates on the screen 108 for imaging. Due to the use of the color wheel 102 by the single-chip DLP, when the ...

AI Technical Summary

Problems solved by technology

The manufacturing process of the color separation and recombination prism 206 is very difficult, the price and cost are also very high, and the volume is large and the weight is relatively heavy, accounting for most of the weight of the entire DLP projection system.

Moreover, the light path is firstly separated and then combined in the color separation and recombination prism 206, and the light path is complex and long, thus affecting the projection effect

[0004] In addition, because the white light of the light source does not meet the requirements of color balance in terms of spectral distribution, in order to meet the color balance, the method of suppressing part of the spectrum light is usually used to modulate the color balance, resulting in a decrease in light energy utilization.

Moreover, due to the lack of red light in the bulb, a wide spectrum will be used to solve the problem of red light brightness, which in turn will cause a decrease in color saturation and contrast

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