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CN-122018197-A - Backlight structure and display module

CN122018197ACN 122018197 ACN122018197 ACN 122018197ACN-122018197-A

Abstract

The invention relates to a backlight structure for providing a light source for a display panel, which comprises a light-emitting substrate and a super-surface lens array, wherein the light-emitting substrate comprises a plurality of light-emitting units, the super-surface lens array is positioned on the light-emitting side of the light-emitting substrate and comprises a plurality of super-surface lenses, the front projection of one super-surface lens on the light-emitting substrate covers at least one light-emitting unit, and the super-surface lens is configured to collect light emitted by at least one corresponding light-emitting unit to a preset position. The invention also relates to a backlight module.

Inventors

  • LI JIAQI
  • WU ZHIWEI
  • ZHAO LE
  • HAN NAN
  • LUO XING
  • WANG SHIBIAO
  • TIAN WENHONG
  • LIANG FEI
  • WANG ZHIQIANG
  • MA ZHANSHAN
  • WANG XUELU
  • WANG XINYU
  • WU ZHENG

Assignees

  • 京东方科技集团股份有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (20)

  1. 1. A backlight structure for providing a light source to a display panel, comprising: a light emitting substrate including a plurality of light emitting units thereon; The super-surface lens array is positioned on the light emitting side of the light emitting substrate and comprises a plurality of super-surface lenses, the front projection of one super-surface lens on the light emitting substrate covers at least one light emitting unit, and the super-surface lenses are configured to collect light emitted by the corresponding at least one light emitting unit.
  2. 2. A backlight structure according to claim 1, wherein the light emitting unit comprises at least one LED lamp.
  3. 3. The backlight structure of claim 1, wherein the array of subsurface lenses comprises adjacent first and second rows of subsurface lenses, a plurality of the first and second rows of subsurface lenses being staggered.
  4. 4. The backlight structure of claim 1, wherein the super surface lens comprises a transparent substrate and a plurality of microstructures disposed on the transparent substrate.
  5. 5. A backlight structure according to claim 4, wherein a plurality of the microstructures are arranged in a plurality of concentric ring structures.
  6. 6. The backlight structure of claim 5, wherein the super-surface lens is a geometric phase super-surface lens, the microstructure is a nano-fin, and a rotation angle of each nano-fin is proportional to a phase change amount of light transmitted through the geometric phase super-surface lens.
  7. 7. The backlight structure of claim 6, wherein the phase of light rays at each light exit location in the super surface lens The following formula is satisfied: Where f is the focal length of the super-surface lens, r is the distance from any one of the nano-fins of the super-surface lens to the center point of the super-surface lens, lambda d is the wavelength of incident light, and n d is the refractive index of the super-surface lens.
  8. 8. The backlight structure of claim 7, wherein when the incident light is blue light, the rotation angle of the nano fins of the plurality of circular ring structures in the super surface lens is from 0 to 0.96 pi in the direction outwards from the center point of the super surface lens, the rotation angle is gradually increased by 0.22n pi, and the distance between two adjacent circular ring structures is m micrometers, wherein n is a rational number, and m = 1/n.
  9. 9. The backlight structure of claim 7, wherein when the incident light is green light, the rotation angle of the nano fins of the plurality of circular ring structures in the super surface lens is from 0 to 0.96 pi in the direction outwards from the center point of the super surface lens, the rotation angle is gradually increased by 0.19n pi, and the distance between two adjacent circular ring structures is m micrometers, wherein n is a rational number, and m = 1/n.
  10. 10. The backlight structure of claim 7, wherein when the incident light is red light, the rotation angle of the nano fins of the plurality of circular ring structures in the super surface lens is from 0 to 0.85 pi in the direction outwards from the center point of the super surface lens, the rotation angle is gradually increased by 0.16n pi, and the distance between two adjacent circular ring structures is m micrometers, wherein n is a rational number, and m = 1/n.
  11. 11. The backlight structure of claim 6, wherein the array of subsurface lenses comprises a first subsurface unit configured to modulate the phase of red light, a second subsurface unit configured to modulate the phase of green light, and a third subsurface unit configured to modulate the phase of blue light; The arrangement mode of the first, second and third super-surface units may be arranged along the row direction of the super-surface lens array, or arranged along the column direction of the super-surface lens array, or arranged in a triangular structure.
  12. 12. A backlight as claimed in claim 6, wherein, In the direction perpendicular to the transparent substrate, the height of the nano fins is greater than or equal to the wavelength of incident light, in the direction parallel to the transparent substrate, the length L of the nano fins is 0.35-0.55 times of the height H of the nano fins, and the width W of the nano fins is 0.2-0.3 times of the height H of the nano fins.
  13. 13. The backlight structure of claim 5, wherein the super-surface lenses are transmission phase type super-surface lenses, the microstructures are nanopillars, and a diameter of each nanopillar is proportional to a phase change amount of light transmitted through the transmission phase type super-surface lenses.
  14. 14. The backlight structure of claim 13, wherein each of the annular ring structures comprises a plurality of circles of nanopillar circles in a direction outward from a center point of the super surface lens, and wherein a radius of a cross section of the nanopillar within the plurality of circles of nanopillar circles is arranged to decrease.
  15. 15. The backlight structure of claim 13, wherein the phase of the super surface lens The following formula is satisfied: Where f is the focal length of the super-surface lens, r is the distance from any one of the nano-pillars of the super-surface lens to the center point of the super-surface lens, lambda d is the wavelength of incident light, and n d is the refractive index of the super-surface lens.
  16. 16. The backlight structure of claim 13, wherein a plurality of grooves are disposed on the first surface of the transparent substrate, a center point of the grooves coincides with a center point of the ring structure, and an extending direction of the grooves is parallel to a radial direction of the ring structure; The bottom of every the recess is provided with the slide rail, along the extending direction of recess, the slide rail includes the connecting region that a plurality of intervals set up, every mobilizable being provided with in the connecting region a plurality of the nanometer post, the nanometer post is close to the one end of slide rail is provided with magnetic connection portion, be provided with the removal control unit including electromagnetic solenoid in the connecting region, the removal control unit is configured to through changing intensity and the direction of electric current, control corresponding the nanometer post removes.
  17. 17. A backlight structure as claimed in claim 16, in which electromagnetic shielding structures are provided between adjacent ones of the connection regions.
  18. 18. The backlight structure of claim 4, wherein the microstructures are provided with quantum dot particles at an end remote from the transparent substrate, the quantum dot particles being for excitation by blue light to produce red light and green light.
  19. 19. The backlight structure of claim 1, wherein the light exit side of the super surface lens is provided with a diffusing structure.
  20. 20. A display module comprising the backlight structure of any one of claims 1-19.

Description

Backlight structure and display module Technical Field The invention relates to the technical field of manufacturing of display products, in particular to a backlight structure and a display module. Background Under the ultra-high resolution of VR field small-size, when MiniLED interval is less, the light between adjacent lamp pearl probably can mutual interference, leads to the halation effect, generally covers through the mode of pixel compensation through Local Dimming algorithm, but still can't eliminate, reduces image quality. If MiniLED pitch is too large, it may cause deterioration of brightness and color uniformity of the display panel. In order to balance and select, miniLED backlight modules are stacked with films with different functions and different thicknesses, and uniformity is ensured while light is received, but as the LED is a lambertian body light source, the brightness of the LED is generally reduced to about 50 percent, the divergence angle of the light is about 120 degrees, and the light passes through various films, and materials with different refractive indexes are stacked together, so that the 120-degree range is further expanded. According to PSF (Point Spread Function ) curve, defining single lamp area as the range of 100% attenuation of brightness to 1%, the general Local Dimming algorithm needs single lamp area to affect 3×3 to 7×7 area, but actual product is 2.56 inch liquid crystal module, total lamp area is 24×24, single lamp area can affect surrounding 23×23 lamp area, beyond the range calculated by algorithm, the pattern with high light and dark contrast can not be processed through rendering and liquid crystal covering of surrounding lamp area, so that halation appears at dark part, the whole image is uneven, and the definition of the image is reduced. At present, a mode of dispensing glue on MiniLED is adopted, a layer of convex lens is similarly added, but at present, the dispensing precision is not well controlled, the size of MiniLED is small, the dispensing glue can overflow to form a spherical surface around, and more stray light can be caused. Meanwhile, due to the action of gravity, the appearance consistency is poor, the optical angle is uncontrollable, and therefore the production cannot be realized. Disclosure of Invention In order to solve the technical problems, the invention provides a backlight structure and a display module. In order to achieve the above object, the technical scheme adopted in the embodiment of the invention is that a backlight structure is used for providing a light source for a display panel, and comprises: a light emitting substrate including a plurality of light emitting units thereon; The super-surface lens array is positioned on the light emitting side of the light emitting substrate and comprises a plurality of super-surface lenses, the front projection of one super-surface lens on the light emitting substrate covers at least one light emitting unit, and the super-surface lenses are configured to collect light emitted by the corresponding at least one light emitting unit. Optionally, the light emitting unit includes at least one LED lamp. Optionally, the super-surface lens array includes adjacent first row super-surface lenses and second row super-surface lenses, and the plurality of super-surface lenses in the first row super-surface lenses and the plurality of super-surface lenses in the second row super-surface lenses are staggered. Optionally, the super surface lens includes a transparent substrate and a plurality of microstructures disposed on the transparent substrate. Optionally, a plurality of the microstructures are arranged in a plurality of concentric ring structures. Optionally, the super-surface lens is a geometric phase super-surface lens, the microstructure is a nano-fin, and a rotation angle of each nano-fin is in direct proportion to a phase change amount of light transmitted through the geometric phase super-surface lens. Optionally, the light phase of each light-emitting position in the super-surface lensThe following formula is satisfied: Where f is the focal length of the super-surface lens, r is the distance from any one of the nano-fins of the super-surface lens to the center point of the super-surface lens, lambda d is the wavelength of incident light, and n d is the refractive index of the super-surface lens. Optionally, when the incident light is blue light, in a direction from the center point of the super-surface lens to the outside, the rotation angles of the nano fins of the plurality of ring structures in the super-surface lens are gradually increased from 0 to 0.96 pi, the gradient is 0.22n pi, and the distance between two adjacent ring structures is m micrometers, where m=1/n, and n is a rational number. Optionally, when the incident light is green light, in a direction from the center point of the super-surface lens to the outside, the rotation angles of the nano fins of the plurality of ring struct