Pixel device

• US 7,245,285 B2
• Filed: 04/28/2004
• Issued: 07/17/2007
• Est. Priority Date: 04/28/2004
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Yeh, Bao-Sung Bruce, Przybyla, James Richard, Regan, Michael John
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): Tran, My-Chau T.
• Application Number:
  US10/833,121
• Publication Number:
  US 20050243080A1
• Time in Patent Office: 1,175 Days
• Field of Search: 345/108, 345/109, 345/110, 345/111, 359/227, 359/233, 359/234
• US Class Current: 345/108
• CPC Class Codes: G02B 26/001 based on interference in an adjustable optical cavity interference filters G02B5/28; devices or arrangements using multiple reflections in spectrometry or monochromators G01J3/26
• CPC Class Codes: G09G 3/3466 based on interferometric effect

Abstract

A pixel device, comprising; a first plate, a second plate disposed under the first plate, and a third plate disposed under the second plate; a first power supply for providing a first voltage to the first plate; a second power supply for providing a second voltage to the second plate; and a third power supply for providing a third voltage to the third plate.

Claims

1. A pixel device, comprising;

a first plate, a second plate disposed under the first plate wherein the second plate and the first plate include non-conductive bumps located on their bottom surfaces, and a third plate disposed under the second plate;

a first power supply for providing a first voltage to the first plate;

a second power supply for providing a second voltage to the second plate; and

a third power supply for providing a third voltage to the third plate.

2. The device as defined in claim 1, wherein the device is a DLD (diffractive light device) MEMS (microelectromechanical system) device.

3. The device as defined in claim 1, wherein the second voltage comprises a variable signal voltage.

4. The device as defined in claim 3, wherein the variable signal voltage modulates the position of the second plate.

5. The device as defined in claim 1, wherein the first power supply is operated so that the first plate is one of positively biased or negatively biased relative to the second plate and the third power supply is operated so that the third plate is the other of the positively biased or negatively biased relative to the second plate.

6. The device as defined in claim 1, wherein the second plate is movable, and the first plate and the third plate are substantially stationary.

7. The device as defined in claim 1, wherein the second plate is closer to the first plate than the third plate.

8. The device as defined in claim 1, wherein the second plate is closer to the third plate than the first plate.

9. The device as defined in claim 1, wherein the second plate is equidistant between the first plate and the third plate.

10. The device as defined in claim 1, wherein the second plate is supported by flexures.

11. The device as defined in claim 1, wherein the second plate is reflective and the first plate is semi-transparent.

12. The device as defined in claim 1, wherein the non-conductive bumps comprise silicon-di-oxide.

13. The device as defined in claim 1, wherein the first plate, the second plate and the third plate are energized in a sequence.

14. The device as defined in claim 13, wherein a distance between the first plate and the second plate is greater than a distance between the third plate and the second plate and wherein the sequence comprises the first plate is biased first.

15. The device as defined in claim 13, wherein a distance between the third plate and the second plate is greater than a distance between the first plate and the second plate and wherein the sequence comprises the third plate is biased first.

16. A method for operating a pixel device, comprising:

providing a first plate, a second plate disposed under the first plate wherein the second plate and the first plate include non-conductive bumps located on their bottom surfaces, and a third plate disposed under the second plate;

preventing the first plate from shorting to the second plate;

preventing the second plate from shorting to the third plate; and

energizing the first plate, the second plate, and the third plate in a sequence to prevent snap up to the first plate or snap down to the third plate by the second plate.

17. The method as defined in claim 16, wherein a distance between the first plate and the second plate is greater than a distance between the third plate and the second plate and wherein the sequence comprises the first plate is biased first.

18. The method as defined in claim 16, wherein a distance between the third plate and the second plate is greater than a distance between the first plate and the second plate and wherein the sequence comprises the third plate is biased first.

19. A pixel device, comprising;

a first plate, a second plate disposed under the first plate, and a third plate disposed under the second plate;

means for preventing the first plate from shorting to the second plate;

means for preventing the second plate from shorting to the third plate;

first power supply means for providing a first voltage to the first plate;

second power supply means for providing a second voltage to the second plate; and

third power supply means for providing a third voltage to the third plate to prevent snap up to the first plate or snap down to the third plate by the second plate.

20. The device as defined in claim 19, wherein the second power supply means for providing a second voltage to the second plate comprises a variable signal voltage means for modulating a position of the second plate.

21. The device as defined in claim 19, wherein the first power supply means for providing a first voltage to the first plate comprises a positive or negative bias means for biasing the first plate relative to the second plate and wherein the third power supply means for providing a third voltage to the third plate comprises the other of a positive or negative bias means for biasing the third plate relative to the second plate.