3D GLASSES AND 3D VIDEO PLAYING APPARATUS

• US 20130027619A1
• Filed: 10/12/2011
• Published: 01/31/2013
• Est. Priority Date: 07/26/2011
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: He, Chengming, Hsiao, Chia-chiang, Chen, Chih-wen
• Granted Patent: US 8,625,036 B2
• Time in Patent Office: Days
• US Class Current: 349/13
• CPC Class Codes: G02B 30/24 involving temporal multiplexing, e.g. using sequentially activated left and right shutters
• CPC Class Codes: G02B 30/25 using polarisation techniques

Abstract

The present disclosure relates to a pair of 3D glasses and a 3D video playing apparatus. A quarter-wave phase plate is provided at the end of a liquid crystal display (LCD) and the end of the pair of 3D glasses respectively so that the light propagates in the form of the circularly polarized light from a 3D display device to the pair of 3D glasses. Thereby, the technical shortcoming of a decreased luminance of an image or even failure to form an image due to an inappropriate angle included between the pair of 3D glasses and the 3D display device is overcome.

Claims

1. A pair of 3D glasses, comprising a left glass and a right glass in symmetry with each other, each of the glasses comprising a liquid crystal layer as well as a second quarter-wave phase plate and a second polarizer disposed at two sides of the liquid crystal layer respectively, wherein both the second quarter-wave phase plate and the second polarizer match with the liquid crystal layer.

2. The pair of 3D glasses of claim 1, further comprising a second half-wave phase plate which is disposed between the second quarter-wave phase plate and the liquid crystal layer and which matches with the liquid crystal layer.

3. The pair of 3D glasses of claim 2, wherein when a polarizing axis of the second half-wave phase plate and an absorbance axis of the second polarizer include an angle of −

θ

₂ there between, a polarizing axis of the second quarter-wave phase plate and the absorbance axis of the second polarizer include an angle of −

2θ

₂−

45°

there between.

4. A 3D video playing apparatus, comprising a 3D display device and the pair of 3D glasses of claim 1, wherein the 3D display device comprises a liquid crystal display, a first polarizer and a first quarter-wave phase plate, a surface of the first polarizer abuts on a light exiting surface of the LCD, the first polarizer matches with the light exiting surface of the LCD, the first quarter-wave phase plate is disposed on the other surface of the first polarizer and matches with the light exiting surface of the LCD;

and

the pair of 3D glasses is located at the side of the light exiting surface of the 3D display device and in a light path of the 3D display device with the second quarter-wave phase plates of the pair of 3D glasses facing towards the light exiting surface of the 3D display device.

5. The 3D video playing apparatus of claim 4, wherein the 3D display device further comprises a first half-wave phase plate that is disposed between the first polarizer and the first quarter-wave phase plate and which matches with the light exiting surface of the LCD.

6. The 3D video playing apparatus of claim 4, wherein the pair of 3D glasses further comprises a second half-wave phase plate that is disposed between the second quarter-wave phase plate and the liquid crystal layer and which matches with the liquid crystal layer.

7. The 3D video playing apparatus of claim 6, wherein when a polarizing axis of the first half-wave phase plate and a transmittance axis of the first polarizer include an angle of θ

₁ there between, a polarizing axis of the first quarter-wave phase plate and the transmittance axis of the first polarizer include an angle of 2θ

₁+45°

there between; and

when a polarizing axis of the second half-wave phase plate and an absorbance axis of the second polarizer include an angle of −

θ

₂ there between, a polarizing axis of the second quarter-wave phase plate and the absorbance axis of the second polarizer include an angle of −

2θ

₂−

45°

there between.

8. A 3D video playing apparatus, comprising a 3D display device and the pair of 3D glasses of claim 1, wherein the 3D display device comprises an LCD, a first polarizer, a first quarter-wave phase plate and a first half-wave phase plate, a surface of the first polarizer abuts on a light exiting surface of the LCD, the first polarizer matches with the light exiting surface of the LCD, the first quarter-wave phase plate is disposed on the other surface of the first polarizer and matches with the light exiting surface of the LCD, the first half-wave phase plate is disposed between the first polarizer and the first quarter-wave phase plate and which matches with the light exiting surface of the LCD;

the pair of 3D glasses is located at the side of the light exiting surface of the 3D display device and in a light path of the 3D display device with the second quarter-wave phase plates of the pair of 3D glasses facing towards the light exiting surface of the 3D display device; and

the pair of 3D glasses further comprises a second half-wave phase plate that is disposed between the second quarter-wave phase plate and the liquid crystal layer and matches with the liquid crystal layer.

9. The 3D video playing apparatus of claim 8, wherein when a polarizing axis of the first half-wave phase plate and a transmittance axis of the first polarizer include an angle of θ

₁ there between, a polarizing axis of the first quarter-wave phase plate and the transmittance axis of the first polarizer include an angle of 2θ

₁+45°

there between; and

when a polarizing axis of the second half-wave phase plate and an absorbance axis of the second polarizer include an angle of −

θ

₂ there between, a polarizing axis of the second quarter-wave phase plate and the absorbance axis of the second polarizer include an angle of −

2θ

₂−

45°

there between.