光学膜及背光模块
By introducing a light conversion layer and microstructures into the optical film, the problems of uneven light output and increased thickness of the backlight module were solved, achieving the effects of thinning and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CORETRONIC CORPORATION
- Filing Date
- 2025-07-01
- Publication Date
- 2026-07-17
AI Technical Summary
Existing direct-lit blue LED backlight modules suffer from uneven backlight output due to a reduction in the number of LEDs, and the increased number of optical films leads to increased backlight module thickness and assembly errors, resulting in higher costs.
The optical film includes a light conversion layer and a microstructure. The light conversion layer is composed of a substrate and uniformly distributed quantum dots. The microstructure is set on the light-incident surface and the light-exit surface of the light conversion layer. The substrate and the microstructure are composed of different materials, which reduces the amount of optical film layers used.
This approach achieves good light uniformity and system brightness while reducing the number of optical film layers, thereby reducing the thickness and assembly difficulty of the backlight module and lowering system costs.
Smart Images
Figure CN224519084U_ABST
Abstract
Claims
1. An optical film characterized by, The optical film includes a light conversion layer and multiple microstructures, wherein: The light conversion layer includes a substrate and a plurality of quantum dots, the quantum dots being uniformly distributed in the substrate, and the light conversion layer having opposing light-incident and light-exit surfaces; and The plurality of microstructures are disposed on at least one of the light-incident surface and the light-exit surface of the light conversion layer. The substrate of the light conversion layer and the plurality of microstructures therein are composed of different materials.
2. The optical film of claim 1, wherein, Each of the plurality of microstructures includes two first surfaces opposite each other and two second surfaces opposite each other, wherein the two first surfaces are located between the two second surfaces, and the junction of the two first surfaces forms an ridge, and the length of the ridge is greater than 0.
3. The optical film of claim 2, wherein, Each of the plurality of microstructures further includes a bottom surface, wherein the bottom surface is rectangular and the four sides of the bottom surface are respectively connected to the two first surfaces and the two second surfaces.
4. The optical film of claim 3, wherein, The angle between the bottom surface and the first surface is not equal to the angle between the bottom surface and the second surface.
5. The optical film of claim 1, wherein, Each of the plurality of microstructures has an alternating concave-convex shape on its four sides on the surface away from the light conversion layer, and the surface is grooved at two diagonals of the four sides, with the most concave point at the intersection of the two diagonals.
6. The optical film of claim 5, wherein, The surface is concave in shape along the line connecting the midpoints of any two opposite sides of the four sides, and the line has a most concave point at the intersection.
7. The optical film of claim 5, wherein, The shape of the surface projection onto the light conversion layer is rectangular.
8. The optical film of claim 1, wherein, The optical film further includes a filter film, the plurality of microstructures are disposed on the light-emitting surface, and the filter film is disposed on the light-incident surface.
9. The optical film of claim 1, wherein, The light conversion layer further includes a protective layer, which is disposed at least on one side of the substrate, and the plurality of microstructures are disposed on the protective layer.
10. The optical film according to claim 9, characterized in that, The protective layer of the light conversion layer and the plurality of microstructures are composed of different materials.
11. A backlight module, characterized by, The backlight module includes a light source and an optical film, wherein: The light source is used to emit a light beam; and The optical film is used to receive the light beam and convert a portion of the light beam into a converted light beam, wherein the optical film includes a light conversion layer and multiple microstructures, wherein: The light conversion layer includes a substrate and a plurality of quantum dots, the quantum dots being uniformly distributed in the substrate. The light conversion layer has opposing incident and emitting surfaces, wherein the incident surface receives the light beam, and the emitting surface allows another portion of the light beam and the converted light beam to exit. The plurality of microstructures are disposed on at least one of the light-incident surface and the light-exit surface of the light conversion layer. The substrate of the light conversion layer and the plurality of microstructures therein are composed of different materials.
12. The backlight module of claim 11, wherein, The backlight module further includes a first prism sheet and a second prism sheet, wherein: The optical film is disposed between the first prism sheet and the light source, and the first prism sheet has a plurality of first prism microstructures; and The first prism sheet is disposed between the second prism sheet and the optical film. The second prism sheet has a plurality of second prism microstructures, and the extension directions of the plurality of second prism microstructures are perpendicular to the extension directions of the plurality of first prism microstructures.
13. The backlight module of claim 12, wherein, The backlight module also includes a reflective polarizing brightness enhancement film, wherein: The second prism sheet is disposed between the reflective polarizing brightening film and the first prism sheet.