Backlight assembly, backlight module and display device

• US 10,203,448 B1
• Filed: 05/01/2018
• Issued: 02/12/2019
• Est. Priority Date: 09/29/2017
• Status: Expired due to Fees

• Current Assignee: Beijing Boe Chatani Electronics Co., Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing Boe Chatani Electronics Co., Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: Li, Wenjun
• Primary Examiner(s): Raabe, Christopher
• Application Number:
  US15/968,698
• Time in Patent Office: 287 Days
• Field of Search: 362612
• CPC Class Codes: G02B 6/002 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence

Abstract

Embodiments of the present disclosure provide a backlight assembly, a backlight module, and a display device. The backlight assembly of the present disclosure comprises a light guide plate and a light bar, wherein an edge of a light-entering end of the light guide plate comprises one or more first edge segments and one or more second edge segments, and the one or more first edge segments protrude from positions of the edge of the light-entering end of the light guide plate other than the one or more second edge segments in a direction facing away from the light guide plate. The light bar comprises one or more LED light bars disposed on one or more light-entering side of the one or more first edge segments and one or more line light sources disposed on one or more light-entering sides of the one or more second edge segments.

Claims

1. A backlight assembly, comprising a light guide plate and a light bar,

wherein an edge of a light-entering end of the light guide plate comprises one or more first edge segments and one or more second edge segments, the one or more first edge segments protrude from one or more positions of the edge of the light-entering end of the light guide plate other than a position of the one or more second edge segments, in a direction facing away from the light guide plate, and

wherein the light bar comprises one or more Light Emitting Diode (LED) light bars disposed on one or more light-entering sides of the one or more first edge segments, and one or more line light sources disposed on one or more light-entering sides of the one or more second edge segments.

2. The backlight assembly according to claim 1, wherein there are at least two second edge segments, and the at least two second edge segments comprise two second edge segments constituting two end segments of the edge of the light-entering end of the light guide plate.

3. The backlight assembly according to claim 2, wherein one first edge segment of the one or more first edge segments constitutes an intermediate segment between the two end segments of the edge of the light-entering end of the light guide plate, and the two second edge segments constituting the two end segments of the edge of the light-entering end are symmetrical to each other with respect to the intermediate segment.

4. The backlight assembly according to claim 2, wherein extension directions of the line light sources disposed on the light-entering sides of the at least two second edge segments are in a same straight line.

5. The backlight assembly according to claim 1, wherein each of the one or more LED light bars comprises a first circuit board and a plurality of LED lights disposed on the first circuit board, and each of the one or more line light sources comprises a second circuit board and a line light source body disposed on the second circuit board.

6. The backlight assembly according to claim 5, wherein the first circuit board and the second circuit board constitute an integrated circuit board.

7. The backlight assembly according to claim 5, wherein each line light source body comprises a circuit substrate, a plurality of light-emitting chips and a fluorescent film, wherein the circuit substrate has a strip shape, the plurality of light-emitting chips are all attached to the circuit substrate and arranged to be evenly spaced apart in a longitudinal direction of the circuit substrate, and the fluorescent film is provided on the circuit substrate and covers the plurality of light-emitting chips.

8. The backlight assembly according to claim 5, wherein each line light source body has a side wall that is attached to the corresponding second circuit board, a top wall that is opposite to the corresponding second edge segment, and a bottom wall that is welded to the corresponding second circuit board by a fillet weld at one or more welding points.

9. The backlight assembly according to claim 5, wherein a protruding height of each LED light from each corresponding first circuit board is equal to a protruding height of each line light source body from each corresponding second circuit board.

10. The backlight assembly according to claim 5, wherein a protruding height of each LED light from each corresponding first circuit board is h₁, a protruding height of each line light source body from each corresponding second circuit board is h₂, and h₁ is greater than h₂.

11. The backlight assembly according to claim 10, wherein the light guide plate comprises a main body portion having a thickness of d, and a protruding portion arranged to protrude from a portion of the edge of the light-entering end other than the one or more second edge segments, in a direction facing away from the main body portion, wherein d is less than h₁ but greater than h₂, and in the protruding direction of the protruding portion, a thickness of the protruding portion gradually increases from d to d₁ that is greater than h₁.

12. The backlight assembly according to claim 1, wherein a protruding distance of each first edge segment from each corresponding position of the edge of the light-entering end of the light guide plate other than the one or more second edge segments, in the direction facing away from the light guide plate, is less than or equal to 2.5 mm.

13. The backlight assembly according to claim 5, wherein thicknesses of each first circuit board and each second circuit board are 0.12 mm, 0.10 mm, 0.08 mm, or less than 0.08 mm.

14. The backlight assembly according to claim 5, wherein a protruding height of each line light source body from each corresponding second circuit board is 0.40 mm, 0.35 mm or 0.30 mm.

15. The backlight assembly according to claim 5, wherein a gap between each first edge segment and each corresponding LED light and a gap between each second edge segment and each corresponding line light source body have a width that is less than or equal to 0.12 mm.

16. The backlight assembly according to claim 1, wherein a number of the first edge segments is one, two or three.

17. A backlight module, comprising the backlight assembly according to claim 1.

18. The backlight module according to claim 17, further comprising a light-shielding tape configured to cover a light-exiting side of the light-entering end of the light guide plate in the backlight assembly.

19. The backlight module according to claim 18, wherein a distance from an inner edge of the light-shielding tape to an effective light-exiting surface of the or each line light source body in the backlight assembly is in a range of 0.8 mm to 1.5 mm, and/or a distance from the inner edge of the light-shielding tape to an effective light-exiting surface of the or each LED light in the backlight assembly is in a range of 2.0 mm to 3.5 mm.

20. A display device, comprising the backlight module according to claim 17.