Method of making a light modulating display device and associated transistor circuitry and structures thereof

• US 7,830,588 B2
• Filed: 02/09/2009
• Issued: 11/09/2010
• Est. Priority Date: 12/19/1996
• Status: Expired due to Fees

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Qualcomm MEMS Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Miles, Mark W.
• Primary Examiner(s): Thompson; Timothy J
• Application Number:
  US12/368,136
• Publication Number:
  US 20100039370A1
• Time in Patent Office: 638 Days
• Field of Search: 359/223, 359/224, 359/290, 359/291
• US Class Current: 359/291
• CPC Class Codes: G02B 26/00 Optical devices or arrangements for the control of light using movable or deformable optical elements control of light by modification of the optical properties of the media of the elements involved therein G02F1/00
• 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: G02B 27/01 Head-up displays
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G09G 2310/0267 Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
• CPC Class Codes: G09G 2310/0275 Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
• CPC Class Codes: G09G 3/3466 based on interferometric effect
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

An Interferometric Modulator (IMod) is a microelectromechanical device for modulating light using interference. The colors of these devices may be determined in a spatial fashion, and their inherent color shift may be compensated for using several optical compensation mechanisms. Brightness, addressing, and driving of IMods may be accomplished in a variety of ways with appropriate packaging, and peripheral electronics which can be attached and/or fabricated using one of many techniques. The devices may be used in both embedded and directly perceived applications, the latter providing multiple viewing modes as well as a multitude of product concepts ranging in size from microscopic to architectural in scope.

Claims

1. A method of manufacturing a display device, comprising:

forming at least one interferometric modulator over a substrate, each interferometric modulator comprising a first mirror formed over the substrate and a second mirror separated by a spacing from the first mirror; and

forming at least one transistor circuit on the substrate,

wherein forming the at least one interferometric modulator and the at least one transistor circuit comprises depositing at least one layer of material to form a portion of the at least one interferometric modulator and a portion of the at least one transistor circuit.

2. The method of claim 1, wherein the spacing between the mirrors at least in part determines a color of light reflected by each interferometric modulator.

3. The method of claim 1, wherein forming the at least one transistor circuit comprises electrically connecting the at least one transistor circuit to the at least one interferometric modulator.

4. The method of claim 1, wherein depositing the at least one layer comprises depositing one or more of amorphous silicon, polysilicon and cadmium selenide.

5. The method of claim 1, further comprising forming an array of a plurality of interferometric modulators on the substrate, wherein forming the at least one transistor circuit comprises forming the at least one transistor circuit in a region that is outside of the array.

6. The method of claim 1, wherein forming each interferometric modulator comprises forming two electrodes, and further wherein forming the at least one transistor circuit comprises forming a driver circuit configured to supply a voltage to the electrodes to cause the spacing between the mirrors to change.

7. The method of claim 1, wherein the substrate comprises an electrically active material.

8. The method of claim 1, wherein the substrate comprises an electrically inactive material.

9. The method of claim 1, further comprising forming a microelectromechanical switch on the substrate electrically connected to the at least one transistor circuit, the at least one interferometric modulator, or both.

10. The method of claim 1, wherein forming the at least one transistor circuit comprises forming a thin film transistor (TFT) circuit.

11. The method of claim 1, wherein the at least one transistor circuit comprises a microprocessor.

12. The method of claim 1, wherein the at least one transistor circuit comprises a memory.

13. A display device comprising:

means for modulating light formed over a substrate, the light modulating means comprising a first mirror formed over the substrate and a second mirror separated by a spacing from the first mirror; and

means for driving formed on the substrate,

wherein a layer of the light modulating means and a layer of the driving means each comprise a portion of the same deposited layer of material.

14. The display device of claim 13, wherein the light modulating means comprises at least one interferometric modulator.

15. The display device of claim 13, wherein the means for driving comprises at least one transistor circuit.

16. The display device of claim 13, wherein the spacing between the mirrors at least in part determines a color of light reflected by the light modulating means.

17. The display device of claim 13, wherein the driving means is formed to be electrically connected to the light modulating means.

18. The display device of claim 13, wherein the common material of the at least one layer of the light modulating means and the driving means comprises one or more of amorphous silicon, polysilicon and cadmium selenide.

19. The display device of claim 13, further comprising an array of a plurality of interferometric modulators, wherein the driving means is formed in a region that is outside of the array.

20. The display device of claim 15, wherein the light modulating means further comprises two electrodes, and further wherein the at least one transistor circuit comprises a driver circuit configured to supply a voltage to the electrodes to cause the spacing between the mirrors to change.

21. The display device of claim 13, wherein the substrate comprises an electrically active material.

22. The display device of claim 13, wherein the substrate comprises an electrically inactive material.

23. The display device of claim 13, further comprising a microelectromechanical switch formed on the substrate electrically connected to the driving means, the light modulating means, or both.

24. The display device of claim 13, wherein the means for driving comprises a microprocessor.

25. The display device of claim 13, wherein the means for driving comprises a memory.

26. The display device of claim 13, wherein the means for driving comprises a thin film transistor (TFT) circuit.

27. The display device of claim 13, further comprising:

a display;

a processor that is configured to communicate with said display, said processor being configured to process display information; and

a memory device that is configured to communicate with said processor.

28. The display device of claim 27, further comprising:

a driver circuit configured to send at least one signal to said display.

29. The display device of claim 28, further comprising:

a controller configured to send at least a portion of said display information to said driver circuit.

30. The display device of claim 27, further comprising a transceiver configured to send display information to said processor.

31. The display device of claim 27, further comprising:

an input device configured to receive input data and to communicate said input data to said processor.