Search

CN-117908295-B - Backlight module and display device

CN117908295BCN 117908295 BCN117908295 BCN 117908295BCN-117908295-B

Abstract

The invention discloses a backlight module and a display device, wherein a light guide structure is arranged on the bottom surface, the light guide plate comprises a bottom surface, a first side surface and a second side surface, the first light bar comprises a first light emitting part arranged on one side of the first side surface, the light emitting direction of the first light emitting part faces the first side surface and emits light along the first direction, the second light bar comprises a second light emitting part arranged on one side of the second side surface, the light emitting direction of the second light emitting part faces the second side surface and emits light along the second direction, the first direction is different from the second direction, the light guide structure comprises a first light guide surface opposite to the first light emitting part and a second light guide surface opposite to the second light emitting part, the first light guide surface is a mirror reflection surface, the second light guide surface is a diffuse reflection surface, when the backlight module is configured in a first state, the first light emitting part emits light, the second light emitting part does not emit light, and when the backlight module is configured in a second state, at least the second light emitting part emits light along the second direction.

Inventors

  • LEI HUI

Assignees

  • 广州华星光电半导体显示技术有限公司

Dates

Publication Date
20260512
Application Date
20240229

Claims (12)

  1. 1. A backlight module, comprising: The light guide plate comprises a bottom surface far away from the light emitting side of the backlight module, and a first side surface and a second side surface which are connected with the bottom surface, wherein the bottom surface is provided with a plurality of light guide structures; The first light bar comprises a first light emitting piece arranged on one side of the first side face, and the light emitting direction of the first light emitting piece faces the first side face and emits light along the first direction; the second light bar comprises a second light emitting part arranged on one side of the second side surface, the light emitting direction of the second light emitting part faces the second side surface and emits light along a second direction, and the first direction is different from the second direction; The light guide structure comprises a first light guide surface and a second light guide surface, wherein the first light guide surface is opposite to the first light emitting part, the second light guide surface is opposite to the second light emitting part, the first light guide surface is a specular reflection surface, the second light guide surface is a diffuse reflection surface, the backlight module is switched between a first state and a second state, when the backlight module is configured in the first state, the first light emitting part emits light, the second light emitting part does not emit light, and when the backlight module is configured in the second state, at least the second light emitting part emits light.
  2. 2. The backlight module according to claim 1, wherein an included angle between the first light guiding surface and the first direction is smaller than an included angle between the second light guiding surface and the second direction.
  3. 3. A backlight module according to claim 1 or 2, wherein the angle between the first light guiding surface and the first direction is greater than or equal to 15 ° and less than or equal to 30 °.
  4. 4. A backlight module according to claim 1 or 2, wherein the first light guiding surface is a plane surface and the second light guiding surface is an arc surface.
  5. 5. A backlight module according to claim 4, wherein the second light guiding surface protrudes toward a side away from the first light guiding surface.
  6. 6. The backlight module according to claim 1, wherein the light guide plate further comprises a third side surface connected to the bottom surface, the backlight module further comprises a third light bar, the third light bar comprises a third light emitting element arranged at one side of the third side surface, the light emitting direction of the third light emitting element is towards the third side surface and emits light along a third direction, and the third direction is different from the first direction and the second direction; The light guide structure comprises a third light guide surface which is opposite to the third light emitting piece, the third light guide surface is a specular reflection surface, and the third light emitting piece emits light at least when the backlight module is configured in the first state.
  7. 7. A backlight module according to claim 6, wherein the third direction is opposite to the first direction.
  8. 8. The backlight module according to claim 1, wherein the light guide plate further comprises a fourth side surface connected to the bottom surface, the backlight module further comprises a fourth light bar, the fourth light bar comprises a fourth light emitting element arranged at one side of the fourth side surface, the light emitting direction of the fourth light emitting element is towards the fourth side surface and emits light along a fourth direction, and the fourth direction is different from the first direction and the second direction; The light guide structure comprises a fourth light guide surface which is opposite to the fourth light emitting piece, the fourth light guide surface is a diffuse reflection surface, when the backlight module is configured in the first state, the fourth light emitting piece does not emit light, and when the backlight module is configured in the second state, the fourth light emitting piece emits light.
  9. 9. A backlight module according to claim 8, wherein the fourth direction intersects the second direction or the fourth direction is opposite to the second direction.
  10. 10. The backlight module according to claim 1, wherein the first light bar comprises a first circuit board, the first light emitting element is disposed on the first circuit board, the first circuit board is located at a side of the light guide plate where the bottom surface is disposed, one end of the first circuit board is connected with the first light emitting element, and the other end of the first circuit board overlaps the light guide plate along a thickness direction of the light guide plate; The second light bar comprises a second circuit board, the second light emitting part is arranged on the second circuit board, the second circuit board is positioned on one side of the bottom surface of the light guide plate, one end of the second circuit board is connected with the second light emitting part, and the other end of the second circuit board is overlapped with the light guide plate along the thickness direction of the light guide plate.
  11. 11. A backlight module according to claim 10, wherein the surface of the first circuit board opposite to the light guide plate is provided with a first reflective layer, and the surface of the second circuit board opposite to the light guide plate is provided with a second reflective layer.
  12. 12. A display device, comprising a display panel and a backlight module according to any one of claims 1 to 11, wherein the display panel is disposed on a light emitting side of the backlight module.

Description

Backlight module and display device Technical Field The present invention relates to the field of display technologies, and in particular, to a backlight module and a display device. Background Displays are used in various aspects of people's daily lives, and the viewing angle requirements of the displays are different for different applications. For example, when a user is in an open environment where privacy is required, such as entering a withdrawal password, watching private information in public transportation, or negotiating business, a display with a narrower viewing angle is required for privacy purposes to protect personal privacy. When the user is in the environment with sharing requirement, as other people watch the display device together, a wider viewing angle is needed to achieve the purpose of sharing. At present, the purpose of dynamic peeping prevention is often achieved by adding a peeping prevention film in a display, such as a liquid crystal peeping prevention film, but the existing peeping prevention film has a complex structure and greatly increases the cost of the display. Disclosure of Invention The embodiment of the invention provides a backlight module and a display device, which can realize dynamic peep prevention, simplify the structure of the backlight module and reduce the cost. The embodiment of the invention provides a backlight module, which comprises: The light guide plate comprises a bottom surface far away from the light emitting side of the backlight module, and a first side surface and a second side surface which are connected with the bottom surface, wherein the bottom surface is provided with a light guide structure; The first light bar comprises a first light emitting piece arranged on one side of the first side face, and the light emitting direction of the first light emitting piece faces the first side face and emits light along the first direction; the second light bar comprises a second light emitting part arranged on one side of the second side surface, the light emitting direction of the second light emitting part faces the second side surface and emits light along a second direction, and the first direction is different from the second direction; The light guide structure comprises a first light guide surface and a second light guide surface, wherein the first light guide surface is opposite to the first light emitting part, the second light guide surface is opposite to the second light emitting part, the first light guide surface is a specular reflection surface, the second light guide surface is a diffuse reflection surface, the backlight module is switched between a first state and a second state, when the backlight module is configured in the first state, the first light emitting part emits light, the second light emitting part does not emit light, and when the backlight module is configured in the second state, at least the second light emitting part emits light. In one embodiment of the present invention, an angle between the first light guiding surface and the first direction is smaller than an angle between the second light guiding surface and the second direction. In one embodiment of the present invention, an angle between the first light guiding surface and the first direction is greater than or equal to 15 ° and less than or equal to 30 °. In an embodiment of the invention, the first light guiding surface is a plane, and the second light guiding surface is an arc surface. In one embodiment of the present invention, the second light guiding surface protrudes toward a side away from the first light guiding surface. In an embodiment of the invention, the light guide plate further includes a third side surface connected to the bottom surface, the backlight module further includes a third light bar, the third light bar includes a third light emitting element disposed on one side of the third side surface, a light emitting direction of the third light emitting element is disposed towards the third side surface and emits light along a third direction, and the third direction is different from the first direction and the second direction; The light guide structure comprises a third light guide surface which is opposite to the third light emitting piece, the third light guide surface is a specular reflection surface, and the third light emitting piece emits light at least when the backlight module is configured in the first state. In one embodiment of the invention, the third direction is opposite to the first direction. In an embodiment of the invention, the light guide plate further includes a fourth side surface connected to the bottom surface, the backlight module further includes a fourth light bar, the fourth light bar includes a fourth light emitting member disposed on one side of the fourth side surface, a light emitting direction of the fourth light emitting member is disposed towards the fourth side surface and emits light along a fourth direction