Display device and display system

Abstract

The invention provides a display device and a display system. The display device comprises a narrow-spectrum light source which is used for emitting narrow-spectrum light in elliptical distribution; areflecting device which comprises a reflecting surface, wherein the reflecting surface is used for reflecting the narrow-spectrum light and obtaining modulated light; and a light modulation device which is used for modulating the modulated light to obtain image light of a to-be-displayed image. The light modulation device comprises a modulation surface used for receiving the modulated light, anda preset angle is formed between the modulation surface and the optical axis of the modulated light, so that the modulated light forms a circular light spot on the modulation surface. The narrow-spectrum light obeying ellipse distribution enters the light modulation device to form the circular light spot, so that the light modulation device can emit image light distributed at a circular angle, thelighting effect can be improved, and better image display quality can be realized.

Description

technical field [0001] The present invention relates to the field of projection technology, in particular to a display device and a display system. Background technique [0002] This section is intended to provide a background or context to a detailed description of the invention that is recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] Among the light sources of the projection system, the light intensity distribution of light sources such as bulbs, LEDs, and phosphors is Lambertian distribution. After the light beams emitted by them are efficiently collected by the optical system, the light intensity is a circular flat-top distribution. The laser light source is a Gaussian beam, and after passing through the above optical system, its angular light intensity distribution is a Gaussian distribution. [0004] Reflecting devices, especially total internal reflection prisms (TIR prisms), are usually used in p...

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Problems solved by technology

[0010] Generally, the lens aperture is circular, and the minor axis dimension of the light beam emitted by the light modulation device 902 is set to be slightly smaller than the aperture diameter of the lens 903, so that the aperture of the lens 903 is completely filled with light. However, this will cause the light modulation device 902 There is some light loss in the direction of the long axis of the outgoing beam, and the light efficiency of the system is not high

In order to allow the light beam emitted by the light modulation device 902 to be completely collected by the lens 903 to achieve higher optical efficiency, the size of the long axis direction of the light ellipse distribution is slightly smaller than the aperture diameter of the lens 903, and in the short axis direction On the other hand, there is a large vacancy, which will affect the quality of the output image of the projection device.

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