Lighting device and projection system with the lighting device

Abstract

An illumination system capable of realizing a color image without a color wheel, and a projection system employing the illumination system. The illumination system includes first, second, and third light emitting devices and first and second hologram devices. The first, second, and third light emitting devices emit light beams having different wavelengths. The first and second hologram devices are disposed in an 'X' configuration at an angle with respect to the first, second, and third light emitting devices and transmit or reflect incident light depending on the wavelength of the light. The projection system further includes a display device, and a projection lens unit. The display device processes beams incident in one direction via the first and second hologram devices, according to an input image signal, and forms an image. The projection lens unit enlarges and projects the image formed by the display device on a screen. The illumination system and the projection system can realize a wide color gamut. Thus, the illumination system and the projection system can provide a high-density and high-quality image, and can be compact by compressing the cross-sectional area of a beam.

Description

technical field [0001] The present invention relates to an illumination system and a projection system, in particular to a small illumination system capable of forming a color image without using a color wheel, and a projection system using the illumination system. Background technique [0002] see figure 1 , a conventional projector includes: a light source 100 , a first relay lens 102 , a color wheel 105 , a fly-eye lens 107 , a second relay lens 110 , a display device 112 , and a projection lens system 115 . The first relay lens 102 focuses the beam from the light source 100 . The color wheel 105 splits the incident light into beams of three colors (R, G, B). The fly's eye lens 107 makes the light beam that has passed through the color wheel 105 uniform. The second relay lens 110 focuses the light beam that has passed through the fly's eye lens 107 . The display device 112 forms a color image using the R, G, and B light beams incident continuously through the color wh...

AI Technical Summary

Problems solved by technology

Then, a light loss occurs at the boundary between the colors of the color wheel 105

[0005] In addition, since the color wheel 105 rotates mechanically at a high speed, it is noisy and has poor stability

Due to the structural limitation of the driving motor, it is very difficult to make the color wheel 105 reach a predetermined speed

Therefore, there will be color disorder

Also, color wheel 105 is expensive to make

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