LED lightbar and backlight unit

Patent metadata

Field	Value
Publication number	US-10317604-B2
Application number	US-201715534641-A
Country	US
Kind code	B2
Filing date	May 25, 2017
Priority date	May 5, 2017
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A light-emitting diode (LED) lightbar includes a flexible print circuit, a plurality of LEDs arranged on the flexible print circuit, and a light guiding film arranged on the flexible print circuit. The light guiding film is arranged on two adjacent LEDs. The light guiding film includes an incident surface and an emitting surface. Two sides of the incident surface of the light guiding film are attached to emitting surfaces of the two adjacent LEDs. Compared with the related art, a light guiding film is arranged on emitting surfaces of any two neighboring LEDs in the present disclosure. Light beams emitted by the LEDs enter the light guiding film partially. The light guiding film reflects the partial light beams are transferred to the gap between the LEDs. Therefore, the hotspot phenomenon is well curbed.

First claim

What is claimed is:

1. A light-emitting diode (LED) lightbar, comprising: a flexible print circuit, a plurality of LEDs arranged on the flexible print circuit, and a light guiding film arranged on the flexible print circuit, wherein the light guiding film is arranged on two adjacent LEDs; the light guiding film comprises an incident surface and an emitting surface; two sides of the incident surface of the light guiding film are attached to emitting surfaces of the two adjacent LEDs;
wherein a light guiding dot is only arranged on the incident surface corresponding to a gap between the two adjacent LEDs; the light guiding dot is configured to lead light out; and
wherein a prism structure is only arranged on the emitting surface corresponding to the gap between the two adjacent LEDs; the prism structure is configured to condense light.

2. The LED lightbar of claim 1 , wherein the light guiding film is arranged on the emitting surfaces of one side of the two adjacent LEDs adjacent to the flexible print circuit.

3. The LED lightbar of claim 1 , wherein the prism structure is defined by consecutive V-shaped grooves connected with one another.

4. The LED lightbar of claim 1 , wherein the light guiding dot is formed by spherical recesses arranged in an array.

5. The LED lightbar of claim 4 , wherein the light guiding dot is formed by hemispherical recesses arranged in an array.

6. A backlight unit, comprising: a middle frame, a light guide plate arranged in the middle frame, a light-emitting diode (LED) lightbar, wherein the LED lightbar comprises a flexible print circuit and a plurality of LEDs arranged on the flexible print circuit; a light guiding film is arranged on two adjacent LEDs; the light guiding film comprises an incident surface and an emitting surface; two sides of the incident surface of the light guiding film are attached to emitting surfaces of the two adjacent LEDs; the emitting surface of the light guiding film is adhered to a side of the light guide plate;
wherein a light guiding dot is only arranged on the incident surface corresponding to a gap between the two adjacent LEDs; the light guiding dot is configured to lead light out; and
wherein a prism structure is only arranged on the emitting surface corresponding to the gap between the two adjacent LEDs; the prism structure is configured to condense light.

7. The backlight unit of claim 6 , wherein the light guiding film is arranged on the emitting surfaces of one side of the two adjacent LEDs adjacent to the flexible print circuit.

8. The backlight unit of claim 6 , wherein the prism structure is defined by consecutive V-shaped grooves connected with one another.

9. The backlight unit of claim 6 , wherein the light guiding dot is formed by spherical recesses arranged in an array.

10. The backlight unit of claim 9 , wherein the light guiding dot is formed by hemispherical recesses arranged in an array.

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

• Xie Chen

Classifications

• G02B6/0083

  Details of electrical connections of light sources to drivers, circuit boards, or the like · CPC title

• G02B6/0013 Primary

  Means for improving the coupling-in of light from the light source into the light guide (coupling light into light guides in general G02B6/42) · CPC title

• G02F1/133615 Primary

  Edge-illuminating devices, i.e. illuminating from the side · CPC title

• G02B6/0068

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title

• G02F1/133308

  Support structures for LCD panels, e.g. frames or bezels · CPC title