An illumination system and a projection apparatus

CN224341769UActive Publication Date: 2026-06-09APPOTRONICS CORP LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
APPOTRONICS CORP LTD
Filing Date
2025-05-20
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The energy waste of spatial light modulators in existing projection systems leads to high power consumption, making it difficult to meet the requirements of low power consumption and high dynamic range imaging.

Method used

A dynamic coupling device is adopted, including an electrically controlled polarizing holographic grating, a switchable Bragg grating, or a liquid crystal grating. By controlling the coupling efficiency in zones and adjusting the light source and zoned illumination in combination with the control device, the zoned illumination function is realized, reducing overall power consumption and improving image contrast.

Benefits of technology

It achieves low power consumption and high dynamic range imaging in projection devices, reduces the brightness of dark pixels through zoned illumination, improves the contrast of the displayed image, and meets the requirements of HDR display.

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Abstract

The application is suitable for the field of optical technology, and provides an illumination system and a projection device. The illumination system comprises a light source device, a waveguide and a dynamic coupling-out device. The light source device is used for providing an illumination light beam. The waveguide comprises a coupling-in region and a coupling-out region. The illumination light beam is coupled into the waveguide through the coupling-in region and propagates inside the waveguide to the coupling-out region. The dynamic coupling-out device is arranged at the coupling-out region and is used for coupling out the illumination light beam from the coupling-out region of the waveguide. The dynamic coupling-out device comprises a plurality of sub-zones. The coupling-out efficiency of each sub-zone is adjustable. The dynamic coupling-out device with adjustable coupling-out efficiency of different sub-zones is applied to the projection device. By respectively controlling the coupling-out efficiency of each sub-zone, the sub-zone illumination function of the projection device can be realized, and the overall power consumption is reduced. Meanwhile, the sub-zone illumination can reduce the brightness of the dark-state pixels in the picture, thereby improving the contrast of the display picture and meeting the demand of HDR display.
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