Image shifting module and optical projection device

• US 7,477,799 B2
• Filed: 08/29/2005
• Issued: 01/13/2009
• Est. Priority Date: 11/12/2004
• Status: Active Grant

• Current Assignee: Young Optics, Inc. (Coretronic Corporation)
• Original Assignee: Young Optics, Inc. (Coretronic Corporation)
• Inventors: Wang, Wan Chiang, Lee, Yuan-Yu, Chung, Tai-Ling, Lin, Wei-Szu, Yun, Chi-Chui, Chang, Wei-Sheng
• Primary Examiner(s): Kassa; Yosef
• Application Number:
  US11/162,086
• Publication Number:
  US 20060140511A1
• Time in Patent Office: 1,233 Days
• Field of Search: 382/291, 382/293, 382/295, 382/307, 382/317
• US Class Current: 382/293
• CPC Class Codes: G03B 21/008 using micromirror devices
• CPC Class Codes: G03B 21/142 Adjusting of projection optics
• CPC Class Codes: G03B 2205/00 Adjustment of optical system relative to image or object surface other than for focusing
• CPC Class Codes: G03B 2205/0053 Driving means for the movement of one or more optical element
• CPC Class Codes: H04N 5/7458 the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]

Abstract

An image shifting module for shifting imaging positions of sub-images projected on a screen in each frame, and an optical projection device using the same are provided. The image shifting module includes a first vibration mechanism and a second vibration mechanism. The first vibration mechanism is disposed on the transmission path of the sub-images and shifts the sub-images projected on the screen by a first distance along a horizontal direction in each frame time. Moreover, the second vibration mechanism is disposed on the transmission path of the sub-images and shifts the sub-images projected on the screen by a second distance along a vertical direction in each frame time. Through this image shifting module, the image resolution can be increased.

Claims

1. An image shifting module of a projection device for shifting each imaging position of a plurality of sub-images respectively in each frame time, the image shifting module comprising:

a first vibration mechanism disposed on a transmission path of the sub-images, the first vibration mechanism shifting the imaging position of the sub-images along a horizontal direction by a first distance in each frame time; and

a second vibration mechanism disposed on the transmission path of the sub-images, the second vibration mechanism shifting the imaging position of the sub-images along a vertical direction by a second distance in each frame time.

2. The image shifting module of claim 1, wherein the first vibration mechanism is disposed before or after the second vibration mechanism with respect to the transmission path of the sub-images.

3. The image shifting module of claim 1, wherein the first distance comprises a length of ½

pixel.

4. The image shifting module of claim 1, wherein the second distance comprises a length of ½

pixel.

5. The image shifting module of claim 1, wherein the first vibration mechanism comprises:

a first fixed component; and

a first vibrating component connected to the first fixed component for controlling the first vibrating component to vibrate within a first angle,

wherein the first vibrating component comprises a first optical component part disposed on the transmission path of the sub-images, and the first optical component part shifts the imaging position of the sub-images along the horizontal direction when the first vibrating component vibrates within the first angle.

6. The image shifting module of claim 5, wherein the first fixed component comprises:

a first holder;

a first coil module disposed over the first holder; and

a first sensor module disposed over the first holder for controlling the first vibrating component to vibrate within the first angle through the first coil module.

7. The image shifting module of claim 6, wherein the first vibrating component comprises a first magnetic material part, and the first sensor module changes a magnetism of the first coil module such that an attractive force and/or a repulsive force are generated between the first coil module and the first magnetic material part to control the first vibrating component to vibrate within the first angle.

8. The image shifting module of claim 6, wherein the first sensor module comprises:

a first circuit board disposed over the first holder; and

a first sensor disposed over the first circuit board.

9. The image shifting module of claim 6, wherein the first coil module comprises:

a first barrel;

a first magnet disposed in the first barrel; and

a first coil disposed in the first barrel, wherein the first magnet is disposed through the first coil.

10. The image shifting module of claim 9, wherein the first coil module further comprises a first permeability component disposed in the first barrel, and the first magnet is disposed between a bottom of the first barrel and the first permeability component.

11. The image shifting module of claim 5, wherein the first optical component part comprises a reflection sheet or a lens.

12. The image shifting module of claim 1, wherein the second vibration mechanism comprises:

a second fixed component; and

a second vibrating component connected to the second fixed component for controlling the second vibrating component to vibrate within a second angle,

wherein the second vibrating component comprises a second optical component part disposed on the transmission path of the sub-images, and the second optical component part shifts the imaging position of the sub-images along the vertical direction when the second vibrating component vibrates within the second angle.

13. The image shifting module of claim 12, wherein the second fixed component comprises:

a second holder;

a second coil module disposed over the second holder; and

a second sensor module disposed over the second holder for controlling the second vibrating component to vibrate within the second angle through the second coil module.

14. The image shifting module of claim 13, wherein the second vibrating component comprise a second magnetic material part, and the second sensor module changes a magnetism of the second coil module such that an attractive force and/or a repulsive force are generated between the second coil module and the second magnetic material part to control the second vibrating component to vibrate within the second angle.

15. The image shifting module of claim 13, wherein the second sensor module comprises:

a second circuit board disposed over the second holder; and

a second sensor disposed over the second circuit board.

16. The image shifting module of claim 13, wherein the second coil module comprises:

a second barrel;

a second magnet disposed in the second barrel; and

a second coil disposed in the second barrel, wherein the second magnet is disposed through the second coil.

17. The image shifting module of claim 16, wherein the second coil module further comprises a second permeability component disposed in the second barrel, and the second magnet is disposed between a bottom of the second barrel and the second permeability component.

18. The image shifting module of claim 12, wherein the second optical component part comprises a reflection sheet or a lens.

19. An optical projection device, comprising:

an illumination system for providing a light beam;

a reflective light valve disposed on a transmission path of the light beam, wherein the reflective light valve converts the light beam into a plurality of sub-images in each frame time;

a projection lens disposed on the transmission path of the sub-images, the reflective light valve being disposed between the illumination system and the projection lens; and

an image shifting module disposed on the transmission path of the sub-images and between the reflective light valve and the projection lens, wherein the image shifting module shifts an imaging position of each of the sub-images in each frame time, the image shifting module comprising;

a first vibration mechanism disposed on a transmission path of the sub-images, the first vibration mechanism shifting the imaging position of the sub-images along a horizontal direction by a first distance in each frame time; and

a second vibration mechanism disposed on the transmission path of the sub-images, the second vibration mechanism shifting the imaging position of the sub-images along a vertical direction by a second distance in each frame time.

20. The optical projection device of claim 19, wherein the illumination system comprises a telecentric illumination system or a non-telecentric illumination system.