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CN-116601536-B - Light guide plate, backlight module and display device

CN116601536BCN 116601536 BCN116601536 BCN 116601536BCN-116601536-B

Abstract

A light guide plate (400), a backlight module (200) and a display device (100) are provided. The light guide plate (400) includes a body (410) and a light-acting film (420). The main body (410) has a light incident surface (411), a side surface (412), and an optical surface (413). The light incident surface (411) and the side surface (412) are respectively connected to the optical surface (413). The light-acting film (420) is provided on the side surface (412) of the body (410). The total reflectance of the light-influencing film (420) consists of diffuse reflectance and parallel reflectance. The percent value of parallel reflectance compared to total reflectance is greater than 25, less than 45, and inclusive. The backlight module (200) and the display device (100) comprise a light guide plate (400).

Inventors

  • FANG YIWEN
  • CHEN JIAYING
  • LI YANCHANG
  • LI JUNXIAN

Assignees

  • 瑞仪光电(苏州)有限公司
  • 瑞仪光电股份有限公司

Dates

Publication Date
20260508
Application Date
20221205
Priority Date
20211214

Claims (12)

  1. 1. A light guide plate, comprising: A body having a light incident surface, a side surface and an optical surface, wherein the light incident surface and the side surface are respectively connected with the optical surface, and A light-influencing film disposed on the side of the body, wherein the total reflectivity of the light-influencing film consists of diffuse reflectivity and parallel reflectivity, the percentage value of the parallel reflectivity compared to the total reflectivity being defined as R, the value of R being greater than 25, less than 45 and inclusive, Wherein the body defines a plurality of light emitting blocks, the plurality of light emitting blocks are arranged in a matrix, wherein the average brightness of the plurality of light emitting blocks located at the nearest two opposite sides of the body is R L , and the ratio of the brightness of the plurality of light emitting blocks located at the center of the body is R L , wherein the R and the R L satisfy the following relationship: 1>R L ≧7*10 -6 R 3 -0.0012R 2 +0.0582R-0.0015。
  2. 2. The light guide plate of claim 1, wherein the R L has a value greater than 0.8 and less than 1.
  3. 3. The light guide plate of claim 2, wherein the value of R L is greater than 0.845 and less than 0.875.
  4. 4. The light guide plate according to claim 1, wherein a ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is greater than 0.12, less than 7.33 and includes an end point value, and a thickness of the body is 0.7mm or more and 1mm or less and includes an end point value.
  5. 5. The light guide plate of claim 4, wherein the ratio of the diffuse reflectance to the parallel reflectance of the light-influencing film is less than 1.875 and includes an endpoint value.
  6. 6. The light guide plate of claim 1, wherein a ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is greater than 1.21, less than 1.875, and includes an endpoint value, the thickness of the body being 1mm or less, and including an endpoint value.
  7. 7. The light guide plate according to claim 6, wherein the thickness of the body is 0.35mm or more and 0.7mm or less and includes an end point value, the ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is greater than 1.3 and includes an end point value.
  8. 8. The light guide plate according to claim 1, wherein a ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is greater than 0.12, less than 1.27 and includes an end point value, and a thickness of the body is 0.7mm or more and 1mm or less and includes an end point value.
  9. 9. The light guide plate according to claim 1, wherein a ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is greater than 1.1, less than 1.27 and includes an end point value, and a thickness of the body is 0.55mm or more and 1mm or less and includes an end point value.
  10. 10. The light guide plate according to any one of claims 1 to 8, wherein the light-acting film directly contacts the side surface.
  11. 11. A backlight module, comprising: The light guide plate according to any one of claims 1 to 10; a light source adjacent to the light incident surface of the light guide plate, and At least one optical film is arranged in front of the optical surface of the light guide plate.
  12. 12. A display device, comprising: The light guide plate according to any one of claims 1 to 10; A light source adjacent to the light incident surface of the light guide plate; at least one optical film disposed in front of the optical surface of the light guide plate, and And the display panel is arranged in front of the at least one optical film.

Description

Light guide plate, backlight module and display device The present application claims priority from chinese patent application No. 202111525938.1 entitled "light guide plate, backlight module, and display device" filed on 12/14 of 2021, the entire contents of which are incorporated herein by reference. Technical Field The disclosure relates to a light guide element and an application thereof, and more particularly to a light guide plate, a backlight module using the same, and a display device. Background The conventional side-entry backlight module mainly comprises a light source and a light guide plate. The light guide plate is provided with a light incident side surface, a reflecting light incident surface, a light emergent surface and a reflecting surface, wherein the light incident side surface is opposite to the reflecting light incident surface, and the reflecting surface is opposite to the light emergent surface and is connected with the light incident side surface and the reflecting light incident surface in parallel. Therefore, after the light provided by the light source enters the light guide plate from the light inlet side, the light can be reflected in the light guide plate and emitted from the light outlet surface. However, when some light travels to the reflective light-incident surface, it is emitted from the reflective light-incident surface, and light leakage or bright line is generated. Disclosure of Invention Therefore, an objective of the present disclosure is to provide a light guide plate, a backlight module and a display device, wherein the light guide plate can fully utilize light, and can improve the problems of light leakage or bright line generation of the conventional light guide plate. According to the above object of the present disclosure, a light guide plate is provided. The light guide plate comprises a body and a light action film. The main body is provided with a light incident surface, a side surface and an optical surface. The light incident surface and the side surface are respectively connected with the optical surface. The light-acting film is disposed on a side surface of the body. Wherein the total reflectivity of the light-acting film is composed of diffuse reflectivity and parallel reflectivity. The percent value of parallel reflectance compared to total reflectance is defined as R, which is greater than 25, less than 45 and inclusive. According to an embodiment of the disclosure, the body defines a plurality of light emitting blocks arranged in a matrix. The average brightness of the light-emitting blocks located at the two opposite sides of the main body is R L, compared with the brightness of the light-emitting block located at the center of the main body. R and R L conform to the following relationship: 1>RL≧7*10-6R3-0.0012R2+0.0582R-0.0015。 According to an embodiment of the disclosure, the value of R L is greater than 0.8 and less than 1. According to an embodiment of the disclosure, the value of R L is greater than 0.845 and less than 0.875. According to an embodiment of the disclosure, a ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is greater than 0.12 and less than 7.33, and includes the end points. The thickness of the body is 0.7mm or more and 1mm or less and includes the end point values. According to an embodiment of the disclosure, a ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is less than 1.875 and includes an endpoint value. According to an embodiment of the disclosure, the ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is greater than 1.21 and less than 1.875, and includes the end points. The thickness of the body is less than 1mm and includes the end point value. According to an embodiment of the disclosure, the thickness of the body is 0.35mm or more and 0.7mm or less and includes the end point value. The ratio of diffuse reflectance to parallel reflectance of the optically active film is greater than 1.3 and includes the endpoints. According to an embodiment of the disclosure, a ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is greater than 0.12 and less than 1.27, and includes the end points. The thickness of the body is 0.7mm or more and 1mm or less and includes the end point values. According to an embodiment of the disclosure, the ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is greater than 1.1 and less than 1.27 and includes an endpoint value, and the thickness of the body is greater than or equal to 0.55mm and less than or equal to 1mm and includes an endpoint value. According to an embodiment of the disclosure, the light-acting film directly contacts the side surface of the body. According to the above object of the present disclosure, a backlight module is provided. The backlight module comprises the light guide plate, the light source an