Total internal reflection color-combination prism and manufacture method

Abstract

The invention provides a total internal reflection color-combination prism, which comprises a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface, a seventh interface, an eighth 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 seventh interface and the eighth interface are crossed and vertical to each other; the seventh interface transmits red light and green light and reflects blue light; the eighth interface transmits the blue light and the green light and reflects the red light; the red light incident from the first incident face is transmitted through the first interface and the fourth interface, and transmitted out of the first surface; the green light incident from the first incident face is transmitted through the second interface and the fifth interface, and is transmitted out of the second surface; the blue light incident from the first incident face is transmitted through the third interface and the sixth interface, and is transmitted out of the third surface; the light incident from the first incident face is reflected by the eighth interface and is emergent from the emergent face; light incident from the third surface is reflected by the seventh interface and is emergent from the emergent face; and light incident from the second surface is directly transmitted by the seventh interface and the eighth interface, and is emergent from the emergent face.

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 entering 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 bulb 101 passes through the color wheel 102 and outputs three colors of red, green and blue in time sequence. After the light beam passes through the shimming of the light rod 103 and the relay lens group 104, the light beam passes through the total internal reflection prism 105 (Reverse Total Interface Reflection, RTIR prism for short) and irradiates on the digital micro-mirror device 106 (Digital Micro-mirror Device, DMD for short), and the light beam processed...

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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