PROJECTION SCREEN, PROJECTION SYSTEM AND METHOD FOR MAKING THE PROJECTION SCREEN

• US 20110279781A1
• Filed: 06/24/2010
• Published: 11/17/2011
• Est. Priority Date: 05/17/2010
• Status: Abandoned Application

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: WEI, CHAO-TSANG, CHEN, GA-LANE
• Application Number:
  US12/822,193
• Publication Number:
  US 20110279781A1
• Time in Patent Office: Days
• US Class Current: 353/31
• CPC Class Codes: G03B 21/60 characterised by the nature of the surface

Abstract

A projection system, projection screen, and method for making the screen are provided. The projection screen includes a flexible transparent substrate having a first surface and an opposite second surface; and a reflective film formed on the second surface of the substrate. The reflective film reflects red, green and blue light, such as from a projector, making it viewable on the screen, and substantially absorbs ambient light other than the above specified light wavelengths, resulting in relatively higher contrast.

Claims

1. A projection screen for displaying an image projected as a combination of first color light, second color light and third color light, the projection screen comprising:

a flexible transparent substrate having a first surface for receiving the first, second and third color light, and an opposite second surface; and

a reflective film formed on the second surface of the substrate, the reflective film configured for reflecting only the first, second and third color light to form the projected image.

2. The projection screen of claim 1, wherein the substrate has a transmittance of greater than 80% for visible light.

3. The projection screen of claim 1, wherein the first color light is red light with a wavelength range between 640 nm and 780 nm, the second color light is green light with a wavelength range between 500 nm and 560 nm, and the third color light is blue light with a wavelength range between 400 nm and 470 nm.

4. The projection screen of claim 1, wherein the substrate is made of polyvinyl butyral.

5. The projection screen of claim 1, wherein the reflective film comprises a first layer made of aluminum with a thickness in a range from 20 nm and 200 nm, a second layer made of alumina with a thickness in a range from 600 nm and 650 nm, a third layer made of chromium with a thickness in a range from 2 nm and 10 nm.

6. A projection system, comprising:

a projector for emitting first color light, second color light and third color light; and

a projection screen comprising

a flexible transparent substrate having a first surface facing the projector and an opposite second surface; and

a reflective film formed on the second surface, the reflective film configured for only reflecting the first color light, the second color light and the third color light.

7. The projection system of claim 6, wherein the substrate has a transmittance of greater than 80% for visible light.

8. The projection screen of claim 6, wherein the first color light is red light with a wavelength range between 640 nm and 780 nm, the second color light is green light with a wavelength range between 500 nm and 560 nm, and the third color light is blue light with a wavelength range between 400 nm and 470 nm.

9. The projection system of claim 6, wherein the substrate is made of polyvinyl butyral.

10. The projection system of claim 6, wherein the reflective film comprises a first layer made of aluminum with a thickness in a range from 20 nm and 200 nm, a second layer made of alumina with a thickness in a range from 600 nm and 650 nm, a third layer made of chromium with a thickness in a range from 2 nm and 10 nm.

11. A method for making a projection screen for displaying an image projected as a combination of first color light, second color light and third color light, the method comprising:

providing a flexible transparent substrate, the substrate having a transmittance of greater than 80% for visible light, the substrate having a first surface and an opposite second surface;

forming a first layer on the second surface of the substrate for only reflecting the first color light;

forming a second layer on the first layer for only reflecting the second color light; and

forming a third layer on the second layer for only reflecting the third color light.

12. The method of claim 11, wherein the substrate is made of polyvinyl butyral.

13. The method of claim 11, wherein the first layer is made of aluminum, the second layer is made of alumina and the third layer is made of chromium.

14. The method of claim 13, wherein the second layer is formed by sputtering, a thickness of the first layer is in a range from 20 nm and 200 nm, a thickness range of the second layer is from 600 nm and 650 nm;

and a thickness of the third layer is in a range from 2 nm and 10 nm.

15. The method of claim 13, wherein the second layer is formed by oxidizing a part of the first layer.

16. The method of claim 14, wherein after the second layer is formed, a thickness of the aluminum is in a range from 20 nm and 200 nm, and a thickness of the alumina is in a range from 600 nm and 650 nm;

after the third layer is finished, a thickness of the chromium is in a range from 2 nm and 10 nm.