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CN-122018149-A - Broadband optical system based on quantum dot wavelength conversion

CN122018149ACN 122018149 ACN122018149 ACN 122018149ACN-122018149-A

Abstract

The invention discloses a broadband optical system based on quantum dot wavelength conversion, and relates to the technical field of micro display. The invention comprises a blue light Micro-LED light source, a blazed grating, an RGB color quantum dot conversion module and an RGB beam combination module which are sequentially arranged along a light path, wherein the blue light Micro-LED light source, the blazed grating, the RGB color quantum dot conversion module and the RGB beam combination module are driven by field sequences, and a color pattern is formed through time sequence controllable beam deflection, quantum dot conversion and spatial beam combination. The system has the advantages of simple and compact structure, small volume and light weight, can effectively avoid optical crosstalk and resolution loss, remarkably improves the color purity of full-color images, and greatly reduces the system cost.

Inventors

  • LU JIANGANG
  • Wu Aojie
  • TANG MINGYUAN
  • DING WEIPING
  • LIU YUBO

Assignees

  • 上海交通大学

Dates

Publication Date
20260512
Application Date
20260327

Claims (10)

  1. 1. The broadband optical system based on quantum dot wavelength conversion is characterized by comprising a blue light Micro-LED light source, a blazed grating, an RGB color quantum dot conversion module and an RGB beam combination module which are sequentially arranged along a light path, wherein the broadband optical system is driven by field sequences and forms a color pattern through beam deflection, quantum dot conversion and spatial beam combination.
  2. 2. The quantum dot wavelength conversion based broadband optical system of claim 1, wherein the blue Micro-LED light source comprises a blue Micro-LED array, the blue Micro-LED light source having an effective light emitting area of less than 90% of the tunable region of the blazed grating.
  3. 3. The broadband optical system based on quantum dot wavelength conversion according to claim 1, wherein the blazed grating is an electrically controlled liquid crystal blazed grating, the blazed grating is a groove structure, the blazed grating comprises a glass substrate, a nematic liquid crystal and a substrate which are sequentially arranged from top to bottom, and the substrate is additionally provided with distributed electrodes.
  4. 4. A broadband optical system based on quantum dot wavelength conversion according to claim 3, wherein the diffraction angle of the blazed grating is greater than 15 °.
  5. 5. The broadband optical system based on quantum dot wavelength conversion according to claim 1, wherein the RGB color quantum dot conversion modules include a green quantum dot conversion module, a blue quantum dot conversion module, and a red quantum dot conversion module which are spatially isolated from each other and sequentially arranged along an optical path.
  6. 6. The quantum dot wavelength conversion based broadband optical system of claim 5, wherein the blue quantum dot conversion module is a transparent module, and the green, blue and red images are each smaller in size than the effective active area of the corresponding quantum dot conversion module.
  7. 7. A broadband optical system based on quantum dot wavelength conversion according to claim 5, wherein each color quantum dot conversion module is exactly matched to the diffraction order of the blazed grating.
  8. 8. The broadband optical system based on quantum dot wavelength conversion according to claim 1, wherein the RGB beam combining module comprises a high-reflectivity mirror, a blue-reflection band cholesteric liquid crystal polymer film, and a red-reflection band cholesteric liquid crystal polymer film sequentially arranged along an optical path.
  9. 9. The quantum dot wavelength conversion based broadband optical system of claim 1 wherein the field order is a sequence of green, blue and red, and the beam deflection is time controllable.
  10. 10. The quantum dot wavelength conversion based broadband optical system of any one of claims 1-9, wherein the full-color micro-display optical machine is applied to a near-eye display system, and the near-eye display system comprises augmented reality, virtual reality and smart glasses.

Description

Broadband optical system based on quantum dot wavelength conversion Technical Field The invention relates to the technical field of micro display, in particular to a broadband optical system based on quantum dot wavelength conversion. Background In near-to-eye display systems such as Augmented Reality (AR), virtual Reality (VR), and smart glasses, a full-color micro-display light machine is a core component for realizing high-immersion visual output. In order to meet the human eye perception requirement and the requirements of the wearable device on light weight, low power consumption and high reliability, various full-color technology paths have been developed in the industry. At present, a full-color Micro-OLED Micro-display chip is directly adopted as an image source, and is one of mainstream optical-mechanical schemes. The technology relies on a mature semiconductor CMOS backboard process and an OLED evaporation or ink-jet printing process, has the advantages of high resolution, high contrast, quick response, natural RGB pixelation and the like, is limited by physical and chemical stability of organic electroluminescence, and Micro-OLED is easy to degrade materials under high-brightness continuous driving, so that brightness attenuation is accelerated, service life is shortened, and meanwhile, typical peak brightness is generally lower than 2000 cd/m < 2 >, so that outdoor visibility requirements under a strong sunlight environment are difficult to meet. Another main scheme is a beam splitting and combining optical machine based on red, green and blue independent Micro-LED Micro display screens, namely three single-color Micro-LED panels are respectively driven, and light beam combination in space and spectrum dimension is realized through a polarization beam combining cube or a dichroic film. The scheme can obtain higher brightness, wider color gamut and faster response speed, but has the problems of redundant light path, overlarge optical machine quality and volume, high manufacturing cost and the like. Therefore, facing the urgent demands of consumer-grade AR glasses for miniaturization, long service life, high brightness, low power consumption and scalable manufacturing, there is a need for a new full-color optical machine path with high photoelectric conversion efficiency, strong process compatibility, excellent stability and highly compact optical structure Under the background, a full-color optical machine scheme for realizing color conversion based on blue light Micro-LED chip excitation quantum dots has become an important technical path in the full-color display field because of performance breakthrough and manufacturing feasibility. According to the scheme, only one blue light Micro-LED with high brightness and small size is used as a unified excitation source, and RGB three-color luminescence can be generated on a pixel scale through a red quantum dot color conversion layer and a green quantum dot color conversion layer of a pixel level. The technology not only inherits the inherent advantages of high brightness, quick response and long service life of the Micro-LED, but also avoids the technical bottleneck of huge transfer of RGB three-color Micro-LEDs, remarkably simplifies the driving architecture and reduces the complexity of system integration. However, the current full-color Micro-LED based on quantum dot color conversion still faces the problems of complex preparation process, resolution reduction caused by limited pixelation precision, driving control difficulty caused by difference among pixels of blue light LEDs, and the like. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, the present invention is to solve the technical problem of how to effectively avoid optical crosstalk and resolution loss of a full-color micro-display optical machine, reduce the volume and weight of the whole machine, and significantly improve the color purity of full-color images. In order to achieve the above purpose, the invention provides a broadband optical system based on quantum dot wavelength conversion, which comprises a blue light Micro-LED light source, a blazed grating, an RGB color quantum dot conversion module and an RGB beam combination module which are sequentially arranged along a light path, wherein the broadband optical system is driven by field sequences, and forms a color pattern through beam deflection, quantum dot conversion and spatial beam combination. Further, the blue light Micro-LED light source comprises a blue light Micro-LED array, and the effective light emitting area of the blue light Micro-LED light source is smaller than 90% of the adjustable area of the blazed grating. Further, the blazed grating is an electric control liquid crystal blazed grating, the blazed grating is of a groove structure, the blazed grating comprises a glass substrate, nematic liquid crystal and a substrate which are sequentially arranged from top to bottom, the substr