Backlight module with porous optical film and a wavelength conversion layer disposed above a light source where the optical film has a plurality of light emission structures

Patent metadata

Field	Value
Publication number	US-10209564-B2
Application number	US-201715398009-A
Country	US
Kind code	B2
Filing date	Jan 4, 2017
Priority date	Mar 29, 2016
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A backlight module including a substrate, a light source, a porous optical film, and a wavelength conversion optical layer is provided. The light source is located on the substrate. The porous optical film is disposed over the light source and has a plurality of emission structures, and the porous optical film distributes light generated by the light source to be emitted through the emission structures located at different positions of the porous optical film. The porous optical film has a central region and a peripheral region surrounding the central region, the central region is disposed corresponding to the light source, and an area of the central portion is A. The wavelength conversion optical layer is located between the light source and the porous optical film, and a vertical projection area of the wavelength conversion optical film is B, where 0.49≤A/B≤5.

First claim

What is claimed is:

1. A backlight module, comprising:
a substrate;
a light source, located on the substrate;
a porous optical film, disposed above the light source and having a plurality of emission structures, wherein the porous optical film distributes light generated by the light source to be emitted through the emission structures located at different positions; the porous optical film has a central region and a peripheral region surrounding the central region; the central region is disposed corresponding to the light source, and an area of the central region is A; wherein the plurality of emission structures are only located in the peripheral region; and
a wavelength conversion optical layer, located between the light source and the porous optical film, wherein a vertical projection area of the wavelength conversion optical layer is B, and wherein 0.49<=A/B<=5.

2. The backlight module according to claim 1 , wherein a vertical distance between the porous optical film and the wavelength conversion optical layer is H 1 ; a vertical distance between the wavelength conversion optical layer and the substrate is H 2 , 0<H 1 /H 2 <6, and H 1 ≠0.

3. The backlight module according to claim 1 , wherein a distance between the wavelength conversion optical layer and the light source is D, and 10 mm>D≥0.75 mm.

4. The backlight module according to claim 1 , further comprising a supporting frame, wherein the supporting frame is disposed on the substrate and surrounds the light source, and the supporting frame carries the wavelength conversion optical layer.

5. The backlight module according to claim 1 , further comprising at least one first supporting member disposed on the substrate and located on both sides of the light source, wherein the first supporting member has a first supporting pin; the first supporting pin has a first clamping portion and a second clamping portion; and a top end and a bottom end of the first supporting pin abut against a diffusion film and the substrate respectively.

6. The backlight module according to claim 5 , wherein the first clamping portion clamps the porous optical film, and the second clamping portion clamps the wavelength conversion optical layer.

7. The backlight module according to claim 5 , wherein the first clamping portion clamps the porous optical film, the second clamping portion clamps a light transmitting plate; and a first side of the light transmitting plate carries the wavelength conversion optical layer.

8. The backlight module according to claim 7 , wherein a heat insulation layer is disposed at a second side of the light transmitting plate opposite to the wavelength conversion optical layer, and the heat insulation layer faces the light source.

9. The backlight module according to claim 5 , wherein the first supporting pin is spindle-shaped.

10. The backlight module according to claim 5 , further comprising at least one second supporting member disposed on the substrate, wherein the second supporting member has a second supporting pin; a top end of the second supporting pin abuts against the diffusion film; a bottom end of the second supporting member has a third clamping portion, and the third clamping portion clamps the substrate.

11. The backlight module according to claim 1 , further comprising a curved support, wherein two ends of the curved support are fixed on the substrate and located on two sides of the light source; a vertex of the curved support supports the porous optical film; the curved support has two fitting portions, and the wavelength conversion optical layer is fitted in the fitting portions.

12. The backlight module according to claim 1 , further comprising a semicircular hood, wherein the semicircular hood covers the light source; a vertex of the semicircular hood supports the porous optical film; the semicircular hood has two fitting portions, and the wavelength conversion optical layer is fitted in the fitting portions.

13. The backlight module according to claim 1 , wherein the light source comprises:
a cup-shaped structure, disposed on the substrate and having an accommodation space;
a blue light chip, disposed within the accommodation space; and
a packaging adhesive, covering and packaging the blue light chip,
wherein the wavelength conversion optical layer is disposed on the cup-shaped structure; the wavelength conversion optical layer closes an opening of the accommodation space, and a gap is provided between the packaging adhesive and the wavelength conversion optical layer.

14. The backlight module according to claim 1 , wherein the light source comprises:
a lens, disposed on the substrate and forming an accommodation space; and
a blue light chip, disposed within the accommodation space;
wherein the lens has a recess at a position corresponding to the blue light chip, and the recess accommodates the wavelength conversion optical layer.

15. The backlight module according to claim 1 , wherein the light source comprises multiple light sources, the wavelength conversion optical layer comprises multiple wavelength conversion optical layers, and each wavelength conversion optical layer is disposed corresponding to one of the light sources for forming an array arranged in an X direction and a Y direction, wherein
a width of each wavelength conversion optical layer in the X direction is B 1 ;
a width of each wavelength conversion optical layer in the Y direction is B 2 ;
a distance between two adjacent wavelength conversion optical layers in the X direction is B 3 ;
a distance between two adjacent wavelength conversion optical layers in the Y direction is B 4 ;
a distance between two adjacent light sources in the X direction is B 7 ;
a distance between two adjacent light sources in the Y direction is B 8 ; and
B 7 >B 8 , B 1 >B 2 , B 4 ≥B 2 , and (B 1 /B 3 )≥(B 2 /B 4 ).

Assignees

• Au Optronics Corp

Inventors

• PENG Kaung-Jay
• Chen Ming-Lung
• Hsu Ming-Chun
• Wang Chih-Kai
• Chen Chung-Ting
• Wang Ming-Cheng

Classifications

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02F1/133611 Primary

  including means for improving the brightness uniformity · CPC title

• G02F1/133603

  with LEDs · CPC title

• G02F1/133606

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G02F2001/133614

  Physics · mapped topic