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CN-122003635-A - Backlight unit and display device

CN122003635ACN 122003635 ACN122003635 ACN 122003635ACN-122003635-A

Abstract

The present disclosure provides a backlight unit and a display device, the backlight unit (100) including a substrate (10), a first reflective layer (11), a second reflective layer (12), and a light emitting unit (14). A groove (G) is formed in a first surface (S1) of the substrate (10), and a first reflecting layer (11) covers part of the inner wall of the groove (G). The second reflective layer (12) covers the first surface (S1). The second reflecting layer (12) is provided with an opening (H), the orthographic projection of the opening (H) on the substrate (10) falls into the orthographic projection of the groove (G) on the substrate (10), and the second reflecting layer (12) is not contacted with the inner wall of the groove (G). The light emitting unit (14) is arranged on the side of the second reflecting layer (12) facing away from the substrate (10). The second reflection layer (12) comprises a first pattern layer (121) and a second pattern layer (122) which are arranged in a laminated mode, the first pattern layer (121) comprises a first hollowed-out portion (K1) corresponding to the groove (G), and the second pattern layer (122) comprises a reinforcing pattern (P) arranged around the first hollowed-out portion (K1).

Inventors

  • CAO ZHANFENG
  • LI HAIXU
  • LI MENGPING
  • LIU YINGWEI
  • Wei Chuangchuang
  • QI QI

Assignees

  • 京东方科技集团股份有限公司

Dates

Publication Date
20260508
Application Date
20240904

Claims (20)

  1. A backlight unit, comprising: The first surface of the substrate is provided with a groove; a first reflecting layer covering part of the inner wall of the groove; the second reflecting layer comprises an opening, wherein the orthographic projection of the opening on the first surface is positioned in the orthographic projection of the corresponding groove on the first surface, and the second reflecting layer is not contacted with the inner wall of the groove; The light-emitting unit is positioned at one side of the second reflecting layer, which is away from the substrate; The second reflection layer comprises a first pattern layer and a second pattern layer which are arranged in a laminated mode, the first pattern layer comprises a first hollowed-out portion, orthographic projection of the first hollowed-out portion on the first surface coincides with orthographic projection of the opening on the first surface, the second pattern layer comprises a reinforcing pattern, the reinforcing pattern is arranged around the first hollowed-out portion, and orthographic projection of the reinforcing pattern on the first surface at least partially falls into orthographic projection of the corresponding groove on the first surface.
  2. The backlight unit of claim 1, wherein the second pattern layer is located at a side of the first pattern layer facing away from the substrate.
  3. The backlight unit of claim 1 or 2, wherein the orthographic projection of the reinforcing pattern on the first surface is a centrosymmetric pattern.
  4. A backlight unit as claimed in claim 3, wherein the centre of symmetry of the orthographic projection of the reinforcing pattern on the first surface coincides with the geometric centre of the orthographic projection of the recess on the first surface.
  5. The backlight unit according to any one of claims 1 to 4, wherein the reinforcing pattern comprises a plurality of stripe structures and/or a plurality of ring structures.
  6. The backlight unit of claim 5, wherein the extending directions of all the bar-shaped structures of the same reinforcing pattern intersect at a first point, the first point being located within the opening.
  7. The backlight unit of claim 6, wherein the first point is on the same line as the geometric center of the groove perpendicular to the first surface.
  8. The backlight unit according to any one of claims 5 to 7, wherein the reinforcing pattern comprises the number of the stripe structures greater than or equal to 8.
  9. The backlight unit according to any one of claim 5 to 8, wherein, The dimension of the strip-shaped structure along the direction perpendicular to the extension direction of the strip-shaped structure is more than or equal to 3 mu m; the dimension B1 of the strip-shaped structure along the direction perpendicular to the extending direction is not greater than Wherein L represents the perimeter of orthographic projection of the first hollowed-out part on the first surface, n represents the number of the strip-shaped structures included in the same reinforcing pattern, C1 represents the distance between the end parts of two adjacent strip-shaped structures at one side close to the first hollowed-out part, and the value of C1 is more than or equal to 10 mu m.
  10. The backlight unit of claim 5, wherein any two of the plurality of annular structures are coaxially and co-angularly disposed, each of which has a similar pattern of orthographic projections on the first surface.
  11. The backlight unit of claim 10, wherein the shape of the orthographic projection of the annular structure on the first surface is a circular ring; the radial width of the annular structure is 3-100 mu m; the radial distance between two adjacent annular structures is 10-100 μm.
  12. The backlight unit according to any one of claims 5 to 11, wherein the stripe-shaped structures and the ring-shaped structures cross each other to form a grid structure.
  13. The backlight unit according to any one of claims 1 to 4, wherein the reinforcing pattern comprises a plurality of second hollows.
  14. The backlight unit according to claim 13, wherein the maximum dimension of the second hollow is between 3 μm and 100 μm; the distance between two adjacent second hollows is 10-100 μm.
  15. The backlight unit according to any one of claims 1 to 14, wherein the orthographic projection of the groove on the first surface has a first contour, the orthographic projection of the reinforcing pattern on the first surface has an inner contour and an outer contour, the first contour being located between the inner contour and the outer contour; The distance between the outer contour and the first contour is greater than or equal to 50 μm; The distance of the inner contour from the first contour is less than or equal to 60 μm.
  16. The backlight unit according to any one of claims 1 to 15, wherein the reinforcement patterns corresponding to different ones of the first hollows are directly connected to form an integral structure.
  17. The backlight unit according to any one of claims 1 to 16, wherein the second pattern layer and the first pattern layer are the same material; And the thickness of the film layer on the side close to the substrate in the second pattern layer and the first pattern layer is larger than or equal to the thickness of the film layer on the side far away from the substrate.
  18. The backlight unit of any one of claims 1-17, wherein an orthographic projection of the first pattern layer on the substrate covers an orthographic projection of the second pattern layer on the substrate; the first pattern layer is in a continuous whole-layer structure in the area except the first hollowed-out area.
  19. The backlight unit as claimed in any one of claims 1 to 18, further comprising a protrusion structure in the recess, the protrusion structure being lower than or flush with the first surface, the first reflective layer covering a surface of the protrusion structure.
  20. A display device comprising a backlight unit according to any one of claims 1 to 19, and a display panel on a side of the substrate of the backlight unit facing away from the light emitting unit.

Description

Backlight unit and display device Technical Field The present disclosure relates to the field of display technologies, and in particular, to a backlight unit and a display device. Background The passive luminous display device mainly comprises a display panel and a backlight module, wherein the display panel is positioned on the light emitting side of the backlight module and is used for modulating light rays emitted by the backlight module, so that image display is realized. Due to the trend of thinning display devices, thinning of backlight modules is a research hot spot in the industry. Disclosure of Invention The present disclosure provides a backlight unit and a display device for reducing a thickness of the backlight unit and improving stability. In a first aspect of the present disclosure, there is provided a backlight unit including: the first surface of the substrate is provided with a groove; a first reflection layer covering part of the inner wall of the groove; The second reflecting layer comprises an opening, the orthographic projection of the opening on the first surface is positioned in the orthographic projection of the corresponding groove on the first surface, and the second reflecting layer is not contacted with the inner wall of the groove; The light-emitting unit is positioned at one side of the second reflecting layer, which is away from the substrate; The second reflecting layer comprises a first pattern layer and a second pattern layer which are arranged in a laminated mode, the first pattern layer comprises a first hollowed-out portion, orthographic projection of the first hollowed-out portion on the first surface coincides with orthographic projection of the opening on the first surface, the second pattern layer comprises a reinforcing pattern, the reinforcing pattern is arranged around the first hollowed-out portion, and orthographic projection of the reinforcing pattern on the first surface at least partially falls into orthographic projection of the corresponding groove on the first surface. In some backlight units provided by the present disclosure, the second pattern layer is located on a side of the first pattern layer facing away from the substrate. In some backlight units provided by the present disclosure, the orthographic projection of the reinforcing pattern on the first surface is a center symmetrical pattern. In some backlight units provided by the present disclosure, the center of symmetry of the orthographic projection of the reinforcing pattern on the first surface coincides with the geometric center of the orthographic projection of the groove on the first surface. In some backlight units provided by the present disclosure, the reinforcing pattern includes a plurality of stripe structures, and/or a plurality of ring structures. In some backlight units provided by the disclosure, the extending directions of all the strip structures of the same reinforcing pattern intersect at a first point, and the first point is located in the opening. In some backlight units provided by the present disclosure, the geometric center of the first point and the groove are located on the same straight line perpendicular to the first surface. In some backlight units provided by the present disclosure, the reinforcing pattern includes a number of stripe structures greater than or equal to 8. In some backlight units provided by the present disclosure, the stripe structure has a dimension along a direction perpendicular to its own extension of 3 μm or more; the dimension B1 of the strip-shaped structure along the direction perpendicular to the extending direction is not greater than Wherein L represents the perimeter of orthographic projection of the first hollowed-out part on the first surface, n represents the number of strip-shaped structures included in the same reinforcing pattern, C1 represents the distance between the end parts of two adjacent strip-shaped structures at one side close to the first hollowed-out part, and the value of C1 is more than or equal to 10 mu m. In some backlight units provided by the disclosure, any two annular structures in the plurality of annular structures are coaxial and are arranged at the same angle, and orthographic projections of the annular structures on the first surface are similar patterns. In some backlight units provided by the present disclosure, a front projection of the annular structure on the first surface is a circular ring; the radial width of the annular structure is 3-100 μm; the radial distance between two adjacent annular structures is 10-100 μm. In some backlight units provided by the present disclosure, the stripe-shaped structures and the ring-shaped structures are intersected with each other to form a grid structure. In some backlight units provided by the present disclosure, the reinforcing pattern includes a plurality of second hollows. In some backlight units provided by the disclosure, the maximum size of the second hollow i