LIGHT DEFLECTION FILM AND DISPLAY DEVICE USING THE SAME

• US 20190324282A1
• Filed: 03/19/2019
• Published: 10/24/2019
• Est. Priority Date: 04/24/2018
• Status: Active Grant

• Current Assignee: CM Technology Corporation
• Original Assignee: CM Technology Corporation
• Inventors: CHANG, Hsin-Wen, YU, Kuo-Chang
• Granted Patent: US 11,320,662 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 27/0944 Diffractive optical elements, e.g. gratings, holograms gratings per se G02B5/18; holograms used as optical elements per se G02B5/32
• CPC Class Codes: G02B 5/0236 the diffusion taking place within the volume of the element
• CPC Class Codes: G02B 5/0252 using holographic or diffractive means
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133562 on the viewer side
• 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

Abstract

A light deflection film and a display device using the same are provided. The display device includes a display panel and a light deflection film. The light deflection film is disposed on the display panel and includes a first layer, a second layer and a light deflection structure formed at an interface between the first layer and the second layer. The first layer has a first refractive index. The second layer is formed on the first layer and has a second refractive index. The first layer of the light deflection film is located between the second layer and the display panel, and the first refractive index is larger than the second refractive index.

Claims

1. A light deflection film disposed on a light source and comprising:

a first layer having a first refractive index;

a second layer formed on the first layer and having a second refractive index; and

a light deflection structure formed at an interface between the first layer and the second layer;

wherein the light emitted from the light source sequentially passes through the first layer and the second layer, and the first refractive index is larger than the second refractive index.

2. The light deflection film according to claim 1, wherein the distribution ratio D_A of the light deflection film measured with the light being incident on the first layer is smaller than the distribution ratio D_B of the light deflection film measured with the light being incident on the second layer.

3. The light deflection film according to claim 2, wherein the distribution ratio D_A is between 0.99 and 0.3.

4. The light deflection film according to claim 3, wherein D_A/(1−

D_A) is between 50 and 0.4.

5. The light deflection film according to claim 1, wherein the light deflection structure has a period between 0.5 and 20 μ

m.

6. The light deflection film according to claim 1, wherein the first refractive index is between 1.4 and 2.

7. The light deflection film according to claim 1, wherein the second refractive index is between 1.2 and 1.8.

8. The light deflection film according to claim 2, wherein D_B/D_A is between 1.03 and 3.

9. The light deflection film according to claim 2, wherein |D_B−

D_A| is between 0.03 and 2.

10. A display device, comprising:

a display panel; and

a light deflection film disposed on the display panel comprising;

a first layer having a first refractive index;

a second layer formed on the first layer and having a second refractive index; and

a light deflection structure formed at an interface between the first layer and the second layer;

wherein the first layer of the light deflection film is located between the second layer and the display panel, and the first refractive index is larger than the second refractive index.

11. A display device, comprising:

a display panel; and

a light deflection film disposed on the display panel comprising;

a first layer having a first refractive index;

a second layer formed on the first layer and having a second refractive index;

a protection layer formed on the second layer; and

a light deflection structure formed at an interface between the first layer and the second layer;

wherein the first refractive index is larger than the second refractive index.

12. A light deflection film disposed on a light source and comprising:

a first layer;

a second layer formed on the first layer; and

a light deflection structure formed at an interface between the first layer and the second layer;

wherein the distribution ratio D_A of the light deflection film measured with the light being incident on the first layer is smaller than the distribution ratio D_B of the light deflection film measured with the light being incident on the second layer.

13. The light deflection film according to claim 12, wherein the distribution ratio D_A is between 0.99 and 0.3.

14. The light deflection film according to claim 12, wherein D_A/(1−

D_A) is between 50 and 0.4.

15. The light deflection film according to claim 12, wherein a first refractive index of the first layer is larger than a second refractive index of the second layer.

16. The light deflection film according to claim 12, wherein D_B/D_A is between 1.03 and 3.

17. The light deflection film according to claim 12, wherein |D_B−

D_A| is between 0.03 and 2.

18. A light deflection film disposed on the display panel and comprising:

a first layer having a first refractive index;

a second layer formed on the first layer and having a second refractive index;

a protection layer formed on the second layer; and

a light deflection structure formed at an interface between the first layer and the second layer;

wherein the first refractive index is larger than the second refractive index.

19. The light deflection film according to claim 18, wherein the distribution ratio D_A of the light deflection film measured with the light being incident on the first layer is smaller than the distribution ratio D_B of the light deflection film measured with the light being incident on the second layer.

20. The light deflection film according to claim 19, wherein the distribution ratio D_A is between 0.99 and 0.3.

21. The light deflection film according to claim 20, wherein D_A/(1−

D_A) is between 50 and 0.4.

22. The light deflection film according to claim 18, wherein the light deflection structure has a period between 0.5 and 20 μ

m.

23. The light deflection film according to claim 18, wherein the first refractive index is between 1.4 and 2.

24. The light deflection film according to claim 18, wherein the second refractive index is between 1.2 and 1.8.

25. The light deflection film according to claim 19, wherein D_B/D_A is between 1.03 and 3.

26. The light deflection film according to claim 19, wherein |D_B−

D_A| is between 0.03 and 2.