Light deflector and liquid crystal display device using the same

• US 9,052,565 B2
• Filed: 11/16/2011
• Issued: 06/09/2015
• Est. Priority Date: 11/17/2010
• Status: Expired due to Fees

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Shikii, Shinichi, Hayashi, Katsuhiko, Yoshikawa, Motonobu
• Primary Examiner(s): Dharia, Prabodh M
• Application Number:
  US13/521,784
• Publication Number:
  US 20130093663A1
• Time in Patent Office: 1,301 Days
• Field of Search: 345/7, 345/156, 345576-589, 345/613, 348/51, 348/98, 348/115, 348/203, 348/290, 348/576, 348/577, 348/770, 349/15, 349/51, 349/62, 349/193, 359/290, 359/298, 353/7, 347/131, 347/251, 347/256
• US Class Current: 1/1
• CPC Class Codes: G02F 1/29 for the control of the position or the direction of light beams, i.e. deflection
• CPC Class Codes: G02F 1/291 Two-dimensional analogue deflection

Abstract

A light deflector capable of deflecting light in a predetermined deflection direction and modulating the angle of deflection of light includes a plurality of liquid crystal deflection elements arranged in the predetermined deflection direction. In at least one pair of adjacent liquid crystal deflection elements, the dimension of one of the liquid crystal deflection elements in the predetermined deflection direction is different from the dimension of the other liquid crystal deflection element in the predetermined deflection direction.

Claims

1. A light deflector capable of deflecting light in a predetermined deflection direction and modulating an angle of deflection of the light, said light deflector comprising

a plurality of liquid crystal deflection elements having a non-periodic structure arranged in the predetermined deflection direction,

wherein, said liquid crystal deflection elements having the non-periodic structure have different dimensions in the predetermined deflection direction, and

refractive indices of said liquid crystal deflection elements are modulated by application of voltage to said liquid crystal deflection elements, whereby light incident on each of said liquid crystal deflection elements is deflected by refraction.

2. The light deflector according to claim 1, further comprising

an angle magnifying lens provided on a light emission side of said light deflection elements,

wherein an angle of deflection of light emitted from said light deflection elements is increased by said angle magnifying lens.

3. The light deflector according to claim 1,

wherein said light deflection elements are arranged in a plurality of layers in a direction from a light incident side to a light emission side.

4. A liquid crystal display device comprising

said light deflector according to claim 1;

a light source provided on a light incident side of said light deflector; and

a liquid crystal panel provided on a light emission side of said light deflector,

wherein light emitted from said light source is incident on said light deflector, deflected by said light deflector, then emitted from said light deflector, and incident on said liquid crystal panel.

5. The liquid crystal display device according to claim 4,

wherein said light source is configured to sequentially emit light of a plurality of colors having different wavelengths, and

when the light of the plurality of colors having different wavelengths emitted from said light source is sequentially incident on said light deflector, refractive indices of said plurality of light deflection elements are modulated in accordance with the respective wavelength of the light so that sequential beams of the light of the plurality of colors having different wavelengths have the same angle of deflection.

6. The liquid crystal display device according to claim 5,

wherein said light deflection elements are liquid crystal deflection elements.

7. The liquid crystal display device according to claim 4, further comprising

a detection unit configured to detect positions of a right eye and a left eye of a viewer viewing said liquid crystal panel;

and

a control unit configured to control an angle of light deflection by said light deflector based on the positions of the right eye and the left eye detected by said detection unit,

wherein said control unit is configured to switch the angle of light deflection by said light deflector in time series so that the light emitted from said liquid crystal panel is brought to alternately focus on the positions of the right eye and the left eye detected by said detection unit, in time series.

8. A light deflector capable of deflecting light in a predetermined deflection direction by diffraction and modulating an angle of deflection of the light, said light deflector comprising

a plurality of liquid crystal deflection elements arranged in the predetermined deflection direction,

wherein said liquid crystal deflection elements have approximately the same dimension in the predetermined deflection direction,

refractive indices of said liquid crystal deflection elements are modulated by application of voltage to said liquid crystal deflection elements, whereby light incident on each of said liquid crystal deflection elements is deflected by diffraction, and

each of said liquid crystal deflection elements has an opening through which light enters, the opening having a dimension of 50 μ

m or less in the predetermined deflection direction.

9. The light deflector according to claim 8, further comprising

an angle magnifying lens provided on a light emission side of said liquid crystal deflection elements,

wherein an angle of deflection of light emitted from said liquid crystal deflection elements is increased by said angle magnifying lens.

10. The light deflector according to claim 8,

wherein said liquid crystal deflection elements are arranged in a plurality of layers in a direction from a light incident side to a light emission side.

11. A liquid crystal display device comprising

said light deflector according to claim 8;

a light source provided on a light incident side of said light deflector; and

a liquid crystal panel provided on a light emission side of said light deflector,

wherein light emitted from said light source is incident on said light deflector, deflected by said light deflector, then emitted from said light deflector, and incident on said liquid crystal panel.

12. The liquid crystal display device according to claim 11,

wherein said light source is configured to sequentially emit light of a plurality of colors having different wavelengths, and

when the light of the plurality of colors having different wavelengths emitted from said light source is sequentially incident on said light deflector, refractive indices of said plurality of liquid crystal deflection elements are modulated in accordance with the respective wavelength of the light so that sequential beams of the light of the plurality of colors having different wavelengths have the same angle of deflection.

13. The liquid crystal display device according to claim 11, further comprising

a detection unit configured to detect positions of a right eye and a left eye of a viewer viewing said liquid crystal panel;

and

a control unit configured to control an angle of light deflection by said light deflector based on the positions of the right eye and the left eye detected by said detection unit,

wherein said control unit is configured to switch the angle of light deflection by said light deflector in time series so that the light emitted from said liquid crystal panel is brought to alternately focus on the positions of the right eye and the left eye detected by said detection unit, in time series.

14. A liquid crystal display device comprising

a light deflector that deflects light in a predetermined deflection direction;

a light source that is provided on a light incident side of said light deflector and emits light toward said light deflector; and

a liquid crystal panel that is provided on a light emission side of said light deflector and on which the light deflected by said light deflector is incident,

wherein said liquid crystal panel includes a plurality of pixels arranged in a predetermined direction,

said pixels each include a plurality of sub-pixels, and

a direction in which said sub-pixels are arranged is orthogonal to the predetermined deflection direction.

15. The liquid crystal display device according to claim 14, further comprising

a detection unit configured to detect positions of a right eye and a left eye of a viewer viewing said liquid crystal panel;

and

a control unit configured to control an angle of light deflection by said light deflector based on the positions of the right eye and the left eye detected by said detection unit,

wherein said control unit is configured to switch the angle of light deflection by said light deflector in time series so that the light emitted from said liquid crystal panel is brought to alternately focus on the positions of the right eye and the left eye detected by said detection unit, in time series.

16. A liquid crystal display device comprising

a light deflector that deflects light in a predetermined deflection direction;

a light source that is provided on a light incident side of said light deflector and emits light toward said light deflector; and

a liquid crystal panel that is provided on a light emission side of said light deflector and on which the light deflected by said light deflector is incident,

wherein said light deflector includes a plurality of light deflection elements arranged in the predetermined deflection direction,

said liquid crystal panel includes a plurality of pixels arranged in the predetermined deflection direction,

each of said pixels has a dimension greater than a dimension of each of said light deflection elements, in the predetermined deflection direction, and

said pixels are irradiated with light deflected from said light deflection elements.

17. The liquid crystal display device according to claim 16, further comprising

a detection unit configured to detect positions of a right eye and a left eye of a viewer viewing said liquid crystal panel;

and

a control unit configured to control an angle of light deflection by said light deflector based on the positions of the right eye and the left eye detected by said detection unit,

wherein said control unit is configured to switch the angle of light deflection by said light deflector in time series so that the light emitted from said liquid crystal panel is brought to alternately focus on the positions of the right eye and the left eye detected by said detection unit, in time series.