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CN-120559909-B - Image generation unit, head-up display device and vehicle

CN120559909BCN 120559909 BCN120559909 BCN 120559909BCN-120559909-B

Abstract

The embodiment of the application provides an image generation unit, a head-up display device and a vehicle, wherein the image generation unit comprises an illumination light source, a collimating lens array and a display assembly, wherein the illumination light source, the collimating lens array and the display assembly are sequentially arranged along a light transmission direction, the illumination light source is used for providing illumination light, the collimating lens array is used for converting the illumination light into a collimated light, the display assembly comprises a liquid crystal screen, a first radiating optical medium layer and a second radiating optical medium layer, the first radiating optical medium layer and the second radiating optical medium layer are respectively glued on the back side and the light emitting side of the liquid crystal screen, the optical microstructure layer is arranged on the light entering side surface of the first radiating optical medium layer and is used for forming beam expansion light matched with an amplifying light path in the vehicle-mounted head-up display device, an infrared high reflection film is arranged between the liquid crystal screen and the second radiating optical medium layer and is used for reflecting infrared band light so as to reduce heat input, and the heat conductivity of the first radiating optical medium layer and the second radiating optical medium layer is not lower than 2W/mK.

Inventors

  • ZHENG XIAO
  • LIU ZHIXIN
  • ZHANG TINGRUI
  • WANG YAOCHEN
  • FANG FAN

Assignees

  • 歌尔光学科技有限公司

Dates

Publication Date
20260512
Application Date
20250804

Claims (10)

  1. 1. An image generating unit for a head-up display device, the image generating unit comprising, in order along a light transmission direction: an illumination light source (1) for providing illumination light; A collimator lens array (2) for converting the illumination light into a collimated light beam, and A display assembly, comprising: A liquid crystal panel (6); the first heat dissipation optical medium layer (3) is glued to the back side of the liquid crystal screen (6), an optical microstructure layer (4) is arranged on the light incident side surface of the first heat dissipation optical medium layer, and the optical microstructure layer (4) is used for diffusing the collimated light beam into a beam expansion light beam matched with an amplifying light path in the head-up display device; The second heat dissipation optical medium layer (9) is glued on the light emitting side of the liquid crystal screen (6), an infrared high reflection film (7) is arranged between the second heat dissipation optical medium layer and the liquid crystal screen (6), and the infrared high reflection film (7) is used for reflecting infrared band light so as to reduce heat input; Wherein, the heat conductivity of the first heat dissipation optical medium layer (3) and the second heat dissipation optical medium layer (9) is not lower than 2W/mK; an anti-glare film (8) is arranged on the light-emitting side surface of the second heat radiation optical medium layer (9) and used for inhibiting optical double images; The first heat dissipation optical medium layer (3) and the second heat dissipation optical medium layer (9) are respectively connected with the liquid crystal display (6) in a gluing way through an optical adhesive layer (5), wherein the thermal conductivity of the optical adhesive layer (5) is 0.1W/mK-0.3W/mK, and the thickness of the optical adhesive layer (5) is 100-400 mu m; The optical microstructure layer (4) is of a single-sided structure, and the microstructure surface of the optical microstructure layer faces the illumination light source (1); The optical microstructure layer (4) comprises a plurality of microstructure units, wherein each microstructure unit is a free-form surface convex mirror, and the caliber size of each microstructure unit is 20-30 mu m; The plurality of free-form surface convex mirrors in the optical microstructure layer (4) are arranged in an array or random manner; the etendue of each of the freeform convex mirrors is determined by the following relationship: the lateral expansion amount H is H=2arcsin [ EB (H) ×sinFOV (H)/2 ]/Display (H) ]; The longitudinal expansion V is V=2arcsin [ EB (V) ×sinFOV (V)/2 ]/Display (V) ]; wherein EB (H) and EB (V) respectively represent the eye box sizes in the horizontal direction and the vertical direction; FOV (H) and FOV (V) represent the angles of view in the horizontal and vertical directions, respectively; Display (H) and Display (V) represent the horizontal and vertical dimensions of the Display screen of the liquid crystal panel (6), respectively.
  2. 2. The image generation unit according to claim 1, characterized in that the optical glue layer (5) is an optically transparent resin OCR or an optically transparent adhesive OCA.
  3. 3. The image generation unit according to claim 1, wherein the first heat dissipating optical medium layer (3) and the second heat dissipating optical medium layer (9) are both made of heat conducting glass or heat conducting plastic.
  4. 4. The image generation unit according to claim 1, characterized in that the optical microstructured layer (4) is transferred onto the light entrance side surface of the first heat dissipating optical medium layer (3) by nanoimprint, or, The optical microstructure layer (4) is formed on the light incident side surface of the first heat dissipation optical medium layer (3) in an etching mode.
  5. 5. The image generation unit according to claim 1, characterized in that the infrared highly reflective film (7) and the antiglare film (8) are plated on opposite side surfaces of the second heat dissipating optical medium layer (9) by evaporation or magnetron sputtering.
  6. 6. An image generation unit according to claim 1, characterized in that the display assembly is arranged obliquely with respect to the collimator lens array (2) for matching back-end light path imaging requirements; the liquid crystal screen (6) in the display component is a TFT LCD liquid crystal screen.
  7. 7. The image generation unit according to claim 1, wherein the illumination light source (1) adopts a segmented controllable LED array structure configured to be able to independently control the brightness of each segmented LED, thereby providing illumination light with a local dimming function.
  8. 8. The image generation unit according to claim 1, further comprising a fixed support (10), wherein the illumination source (1), the collimator lens array (2) and the display assembly are all arranged to the fixed support (10).
  9. 9. A head-up display device comprising the image generating unit according to any one of claims 1 to 8, a mirror group and a windshield of a vehicle, wherein the mirror group reflects an output light ray of the image generating unit to the windshield to form a virtual image.
  10. 10. A vehicle, characterized by comprising: The heads-up display device of claim 9.

Description

Image generation unit, head-up display device and vehicle Technical Field The embodiment of the application relates to the technical field of optical display, in particular to an image generation unit, head-up display equipment and a vehicle. Background The automobile windshield type head-up display HUD (Head Up Display) is used as an automobile electronic component capable of presenting information on the front windshield of an automobile, is greatly convenient for a driver to observe the instrument information of the automobile, effectively ensures the driving safety and is increasingly widely applied in the automobile field. The conventional HUD system acquires a projection image by lighting an image generating unit and outputs the projection image to a windshield of an automobile by means of reflection of an internal magnifying optical path of a head-up display to form a virtual image. In the conventional HUD TFT PGU optical solution, after the LED array is lit by current driving, light with large-angle diffusion is transmitted to a collimator device, the device gathers light beams, for example, through a biconvex lens, and then sequentially passes through a beam expander group and a diffusion sheet (Diffuser) for processing and then is transmitted to a TFT (liquid crystal screen), and finally the light beams are imaged by the TFT and transmitted to a back-end HUD optical system. However, this solution has the following significant drawbacks: (1) The sunlight backflow overheat problem is that the internal light path of the HUD can converge strong light (such as sunlight) outside a vehicle to an image generation unit (PGU) under the influence of a light reversible principle, high-energy converging light spots are formed, the TFT is locally overheated, components and parts can be damaged under extreme conditions, and the conventional heat dissipation scheme is difficult to meet the requirements of quick heat conduction and temperature rise delay. (2) The optical system is complex, the beam expanding lens group and the independent heat dissipation structure lead to huge system volume, the light efficiency loss among optical devices is 8% (calculated according to the single-side 4% loss of the injection molding lens), and the structure is designed for each lens independently, so that the overall complexity and the manufacturing cost are increased. (3) And simultaneously, the long-term effect of infrared heat radiation can lead to the performance attenuation of optical elements such as a beam expander and a diffusion sheet, thereby shortening the service life of equipment. Disclosure of Invention The application aims to provide a novel technical scheme of an image generation unit, head-up display equipment and a vehicle. In a first aspect, the present application provides an image generating unit for a head-up display device, the image generating unit including: an illumination light source for providing illumination light; A collimating lens array for converting the illumination light into a collimated light beam, and A display assembly, comprising: A liquid crystal panel; The first heat dissipation optical medium layer is glued to the back side of the liquid crystal screen, and an optical microstructure layer is arranged on the light incident side surface of the first heat dissipation optical medium layer and used for diffusing the collimated light beam into a beam expansion light beam matched with an amplifying light path in the head-up display device; the second heat dissipation optical medium layer is glued on the light emitting side of the liquid crystal screen, and an infrared high reflection film is arranged between the second heat dissipation optical medium layer and the liquid crystal screen and is used for reflecting infrared band light rays so as to reduce heat input; Wherein, the heat conductivity of the first heat dissipation optical medium layer and the second heat dissipation optical medium layer is not lower than 2W/mK. Optionally, the light-emitting side surface of the second heat dissipation optical medium layer is provided with an anti-glare film for suppressing optical ghost. Optionally, the first heat dissipation optical medium layer and the second heat dissipation optical medium layer are respectively connected with the liquid crystal screen in a gluing way through an optical adhesive layer, wherein the thermal conductivity of the optical adhesive layer is 0.1W/mK-0.3W/mK, and the thickness of the optical adhesive layer is 100-400 mu m. Optionally, the optical glue layer is an optically transparent resin OCR or an optically transparent adhesive OCA. Optionally, the first heat dissipation optical medium layer and the second heat dissipation optical medium layer are both made of heat conducting glass or heat conducting plastic. Optionally, the optical microstructure layer has a single-sided structure, and the microstructure surface of the optical microstructure layer faces the illuminati