Backlight module having a substrate, plurality of light sources, diffusion film and brightness enhancement film disposed on the substrate

• US 10,488,706 B1
• Filed: 12/05/2018
• Issued: 11/26/2019
• Est. Priority Date: 05/28/2018
• Status: Active Grant

• Current Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Zha, Guowei
• Primary Examiner(s): May, Robert J
• Application Number:
  US16/210,579
• Publication Number:
  US 20190361297A1
• Time in Patent Office: 356 Days
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133612 Electrical details
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence

Abstract

The present disclosure discloses a backlight module and a display device. The backlight module includes a substrate; and a plurality of lamp sources, a fluorescent film, a diffusion film, and a brightness enhancement film carried on the substrate. The fluorescent film, the diffusion film and the brightness enhancement film are sequentially arranged in a light emission direction of the plurality of lamp sources, and the substrate is provided with a reflection sheet configured to reflect light propagated toward the substrate.

Claims

1. A backlight module, comprising:

a substrate;

a reflection sheet, arranged on an upper surface of the substrate and provided with a plurality of open regions;

a plurality of lamp sources, disposed on the substrate and positioned within the open regions; and

a fluorescent film, covering the plurality of lamp sources and the reflection sheet;

wherein the reflection sheet is configured to reflect any light propagated back toward the substrate by a brightness enhancement film along a light emission direction of the plurality of lamp sources;

wherein a diffusion film, a directional film, and the brightness enhancement film are sequentially arranged on the fluorescent film;

wherein the directional film comprises a transparent body and a plurality of cone-shaped bulges arranged at intervals on a surface of the transparent body, and a central angle of the cone-shaped bulge is an acute angle.

2. The backlight module according to claim 1, wherein the center angle of the cone-shaped bulge ranges from 10°

to 60°

, and the apex angle of the cone-shaped bulge is an acute angle at least greater than 30°

.

3. A backlight module, comprising:

a substrate; and

a plurality of lamp sources, a fluorescent film, a diffusion film, and a brightness enhancement film disposed on the substrate;

wherein;

the fluorescent film, the diffusion film and the brightness enhancement film are sequentially arranged in a light emission direction of the plurality of lamp sources, and

the substrate is provided with a reflection sheet, the reflection sheet is configured to reflect any light propagated back toward the substrate by the lightness enhancement film along the light emission direction of the plurality of lamp sources;

wherein the substrate is transparent, and the reflection sheet is adhered to a side of the substrate opposite to the lamp sources, and the reflection sheet comprises an entire-surface structure.

4. The backlight module according to claim 3, wherein the reflection sheet is adhered to an upper surface of the substrate and is provided with a plurality of open regions, and the lamp sources are positioned within the open regions.

5. The backlight module according to claim 3, wherein the substrate carries a drive wire configured to drive the plurality of lamp sources, and a surface of the drive wire is configured to reflect light.

6. The backlight module according to claim 3, wherein a material of the substrate comprises polyimide (PI).

7. The backlight module according to claim 3, further comprising a directional film positioned between the fluorescent film and the brightness enhancement film, wherein the directional film comprises a transparent body and a plurality of cone-shaped bulges arranged at intervals on a surface of the transparent body, and a center angle of the cone-shaped bulge is an acute angle.

8. The backlight module according to claim 7, wherein the central angle of the cone-shaped bulge ranges from 10°

to 60°

.

9. The backlight module according to claim 8, wherein an apex angle of the cone-shaped bulge is an acute angle at least greater than 30°

.

10. A display device, comprising:

a backlight module, wherein the backlight module comprises;

a substrate; and

a plurality of lamp sources, a fluorescent film, a diffusion film, and a brightness enhancement film disposed on the substrate;

wherein the fluorescent film, the diffusion film and the brightness enhancement film are sequentially arranged in a light emission direction of the plurality of lamp sources, and

the substrate is provided with a reflection sheet, the reflection sheet is configured to reflect any light propagated back toward the substrate by the brightness enhancement along the light emission direction of the plurality of lamp sources;

wherein the substrate is transparent, and the reflection sheet is adhered to a side of the substrate opposite to the lamp sources, and the reflection sheet comprises an entire-surface structure.

11. The display device according to claim 10, wherein the reflection sheet is adhered to an upper surface of the substrate and is provided with a plurality of open regions, and the lamp sources are positioned within the open regions.

12. The display device according to claim 10, wherein the substrate carries a drive wire configured to drive the plurality of lamp sources, a surface of the drive wire is configured to reflect light.

13. The display device according to claim 10, further comprising a directional film positioned between the fluorescent film and the brightness enhancement film, wherein the directional film comprises a transparent body and a plurality of cone-shaped bulges arranged at intervals on a surface of the transparent body, and a center angle of the cone-shaped bulge is an acute angle.

14. The display device according to claim 13, wherein the central angle of the cone-shaped bulge ranges from 10°

to 60°

, and the apex angle of the cone-shaped bulge is an acute angle at least greater than 30°

.