Light source assembly for projection system

Abstract

The invention discloses a light source assembly for a projection system. The light source assembly comprises the components of a light guide tube with a hollow inner part, light emitting elements which are arranged outside the left side and the right side of the light guide tube. The light guide tube is composed of a left reflector, a right reflector, an upper reflector, a lower reflector and a back reflector. The inside surfaces of the left reflector and the right reflector are oblique surfaces. The two oblique surfaces are symmetrically arranged and the distance between the two oblique surfaces gradually increase from back to front. The inner part of the light guide tube is provided with a trumpet-shaped emergent chamber with a frontward opening. The front end of the light guide tube is provided with a reflector cup. The light emitting surface of each light emitting element emits light. The light penetrates through the reflector and a phosphor powder at the light emitting surface side. After light which is excited from the phosphor powder is reflected by a reflecting film for many times in the light guide tube, the light is transmitted out of the trumpet-shaped emergent chamber. Partial light which is emergent from the trumpet-shaped emergent chamber is reflected and emitted out by the reflector cup, and the other part is directly emitted out through the reflector cup. Based on a relatively small light emitting surface, the light source assembly for the projection system has advantages of increasing power of the light source assembly and effectively improving optical efficiency of the light source assembly.

Description

technical field [0001] The invention relates to a light source assembly, in particular to a light source assembly used in a projection system. Background technique [0002] Projection systems use traditional light bulbs as light sources for a long time. Due to some inherent defects of light bulbs, projectors using light bulb systems have brought many troubles to projector consumers during use. [0003] First of all, the service life of the bulb can only be maintained for a few thousand hours, and as time goes on, the brightness of the bulb will decay. In this way, consumers need to replace the bulb when other parts of the projector except the bulb can still be used normally. , which brings additional expenses; secondly, because the bulb is a gas light source, it needs to be driven by a high-voltage driver board, and it cannot be turned on immediately, which is extremely inconvenient in practice; thirdly, the ultraviolet light and infrared light emitted by the bulb are harmfu...

AI Technical Summary

Problems solved by technology

[0003] First of all, the service life of the bulb can only be maintained for a few thousand hours, and as time goes on, the brightness of the bulb will decay. In this way, consumers need to replace the bulb when other parts of the projector except the bulb can still be used normally. , which brings additional expenses; secondly, because the bulb is a gas light source, it needs to be driven by a high-voltage driver board, and it cannot be turned on immediately, which is extremely inconvenient in practice; thirdly, the ultraviolet light and infrared light emitted by the bulb are harmful to the surrounding environment and radiation. Components will cause damage. In addition, the high-pressure mercury element in the bulb itself does not meet environmental protection requirements. For these reasons, the use of solid light sources to replace bulbs has always been a research topic in this industry.

[0004] As a solid light source, light-emitting diodes have the characteristics of long life, rich colors, instant switching, simple driving, and environmental protection under the premise of ensuring heat dissipation design. They have great advantages as the main light-emitting components in the projector industry. The luminous power of the diode itself is proportional to the light-emitting area of ​​the light source, so the higher the required luminous power, the larger the light-emitting area, and when the light-emitting area becomes larger, it will not match the area of ​​the micro-display chip when used in a projection system, resulting in Most of the light is wasted and cannot enter the system. In this way, it is relatively difficult to use a conventionally packaged light-emitting diode as a light source to achieve a level of 800 lumens, and the application is limited.

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