Backlight source and display device

• US 10,338,293 B2
• Filed: 08/06/2015
• Issued: 07/02/2019
• Est. Priority Date: 03/26/2015
• Status: Expired due to Fees

• Current Assignee: BOE Optical Science and Technology Co., Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Xu, Shanfei, Zheng, Boran
• Primary Examiner(s): Guharay, Karabi
• Application Number:
  US14/908,498
• Publication Number:
  US 20160282535A1
• Time in Patent Office: 1,426 Days
• Field of Search: 349 64
• 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 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like

Abstract

The present disclosure provides a backlight source, including: a light-guide plate, a diffuser arranged at a light-exiting side of the light-guide plate, and a light bar arranged at a light-entering side of the light-guide plate and including a light-emitting diode (LED) lamp and a flexible circuit board connected to the LED lamp. The flexible circuit board includes a base material, and a first solder mask and a second solder mask arranged at two surfaces of the base material opposite to each other. The base material includes a first region where the second solder mask is arranged and a second region where the second solder mask is not arranged. The second region is located at a side of the base material adjacent to the light-guide plate. The diffuser includes, at an end adjacent to the light bar, a connection member partially or completely covering the second region.

Claims

1. A backlight source, comprising:

a light-guide plate;

a diffuser arranged at a light-exiting side of the light-guide plate; and

a light bar arranged at a light-entering side of the light-guide plate,

wherein the light bar comprises a light-emitting diode (LED) lamp and a flexible circuit board connected to the LED lamp,

the flexible circuit board comprises a base material, a first solder mask and a second solder mask, the first solder mask and the second solder mask are arranged at two surfaces of the base material opposite to each other respectively,

the first solder mask is arranged at a surface of the base material adjacent to the light-guide plate, the second solder mask is arranged at a surface of the base material away from the light-guide plate, and the first solder mask is connected to the LED lamp,

the base material comprises, at the surface where the second solder mask is arranged, a first region where the second solder mask is arranged and a second region where the second solder mask is not arranged, and the second region is located at a side of the base material adjacent to the light-guide plate,

the diffuser comprises, at an end adjacent to the light bar, a connection member partially or completely covering the second region,

the light-guide plate comprises a flared structure at an end adjacent to the light bar,

the flared structure has an oblique surface at the light-exiting side of the light-guide plate, and

the flexible circuit board and the first solder mask extend to overlap the oblique surface of the light-guide plate.

2. The backlight source according to claim 1, wherein a copper wire layer is arranged on the second solder mask and electrically connected to the LED lamp, and an area of a wiring region where the copper wire layer is arranged is not greater than an area of the second solder mask.

3. The backlight source according to claim 1, wherein the flared structure has a flat surface at a side opposite to the light-exiting side of the light-guide plate.

4. The backlight source according to claim 1, wherein the second solder mask is of a thickness identical to the diffuser.

5. The backlight source according to claim 4, wherein the diffuser is of a thickness of 0.04 to 0.055 mm.

6. The backlight source according to claim 1, wherein the diffuser is of a thickness of 0.04 to 0.055 mm.

7. The backlight source according to claim 1, wherein a silkscreen character is arranged on the first solder mask.

8. A display device, comprising the backlight source according to claim 1.

9. The display device according to claim 8, wherein a copper wire layer is arranged on the second solder mask and electrically connected to the LED lamp, and an area of a wiring region where the copper wire layer is arranged is not greater than an area of the second solder mask.

10. The display device according to claim 8, wherein the flared structure has a flat surface at a side opposite to the light-exiting side of the light-guide plate.

11. The display device according to claim 8, wherein the second solder mask is of a thickness identical to the diffuser.

12. The display device according to claim 11, wherein the diffuser is of a thickness of 0.04 to 0.055 mm.

13. The display device according to claim 8, wherein the diffuser is of a thickness of 0.04 to 0.055 mm.

14. The display device according to claim 8, wherein a silkscreen character is arranged on the first solder mask.

15. The display device according to claim 8, wherein the flared structure has a flat surface at a side opposite to the light-exiting side of the light-guide plate.