Optical film element, backlight, and display device

Patent metadata

Field	Value
Publication number	US-10928562-B2
Application number	US-201916241394-A
Country	US
Kind code	B2
Filing date	Jan 7, 2019
Priority date	May 8, 2018
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

An optical film element, a backlight and a display device are disclosed. The optical film element includes a transparent base and a first diffusion film located at a first surface of the transparent base; the optical film element further includes an optical functional layer located at a second surface of the transparent base opposite to the first surface; the optical functional layer includes transmission regions and reflection regions; reflection members are provided in the reflection regions.

First claim

What is claimed is:

1. An optical film element, comprising a transparent base and a first diffusion film provided on a first surface of the transparent base, the optical film element further comprising an optical functional layer provided on a second surface of the transparent base opposite to the first surface, wherein the optical functional layer comprising a transmission region and a reflection region, and a reflection member is provided in the reflection region, and
wherein a via penetrating through the first diffusion film and the transparent base is provided at a position corresponding to the transmission region.

2. The optical film element of claim 1 , further comprising a second diffusion film provided between the optical functional layer and the transparent base.

3. The optical film element of claim 2 , wherein a surface of the second diffusion film away from the transparent base is of a concave-convex structure, and the reflection member is provided on the concave-convex structure.

4. The optical film element of claim 3 , wherein the concave-convex structure has a height difference of 10 μm.

5. The optical film element of claim 4 , wherein the transparent base is made of PET plastic.

6. The optical film element of claim 1 , wherein the transmission region has a width ranging from 20 μm to 1000 μm.

7. The optical film element of claim 1 , wherein a materials of the reflection structure comprises Ag or Al.

8. A manufacturing method of an optical film element, comprising steps of:
forming a first diffusion film on a first surface of a transparent base; and
forming an optical functional layer on a second surface of the transparent base opposite to the first surface,
wherein the optical functional layer comprises a transmission region and a reflection region, and a reflection member is provided in the reflection region, and
wherein the manufacturing method further comprises a step of:
forming a via penetrating the transparent base and the first diffusion film while forming the optical functional layer, wherein the via is provided at a position corresponding to the transmission region.

9. The manufacturing method of an optical film element of claim 8 , wherein the step of forming the optical functional layer and the via comprises steps of:
depositing an optical functional materials on the second surface of the transparent base; and
perforating the optical functional materials, the transparent base and the first diffusion film at a position corresponding to the transmission region, to form the optical functional layer and the via.

10. The manufacturing method of an optical film element of claim 8 , prior to forming the optical functional layer, further comprising a step of: forming a second diffusion film on the second surface of the transparent base, wherein a surface of the second diffusion film away from the transparent base is of a concave-convex structure.

11. The manufacturing method of an optical film element of claim 10 , wherein the step of forming the optical functional layer further comprises a step of:
forming a reflection member on the concave-convex structure using an evaporation process.

12. The manufacturing method of an optical film element of claim 8 , wherein the step of forming the optical functional layer at the second surface of the transparent base opposite to the first surface further comprises steps of:
evaporating a reflection materials on the second surface of the transparent base; and
removing a portion of the reflection materials corresponding to the transmission region using a local etching process to form the optical functional layer.

13. A backlight, comprising: a reflective substrate; a light source provided on the reflective substrate, and an optical film element provided at a light-exiting side of the light source, wherein
the optical film element comprises a transparent base, a first diffusion film provided on a first surface of the transparent base, and an optical functional layer provided on a second surface of the transparent base opposite to the first surface, and wherein
the optical functional layer comprises a transmission region and a reflection region, and a reflection member is provided in the reflection region,
the optical functional layer of the optical film element is provided to face the light source, and
wherein a via penetrating through the first diffusion film and the transparent base is provided at a position corresponding to the transmission region.

14. A display device, comprising the backlight of claim 13 .

15. The display device of claim 14 , further comprising a wavelength conversion film and a prism film provided at a light-exiting side of the optical film element.

16. The display device of claim 15 , wherein the wavelength conversion film is a quantum dot film or a phosphor film.

Assignees

• Beijing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Zhang Shubai
• Cheng Pengfei
• Sun Haiwei
• Ma Junjie
• Hao Yutao
• Lu Yuanda
• Wang Zhen

Classifications

• G02F1/133605 Primary

  including specially adapted reflectors · CPC title

• G02B5/0226 Primary

  having particles on the surface · CPC title

• G02F1/133606

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

• G02F1/133602

  Direct backlight · CPC title

• G02F1/133504

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title