Spatial light modulator with integrated optical compensation structure

• US 9,019,590 B2
• Filed: 12/27/2011
• Issued: 04/28/2015
• Est. Priority Date: 02/03/2004
• Status: Expired due to Fees

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Qualcomm MEMS Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Chui, Clarence, Sampsell, Jeffrey B., Cummings, William J., Tung, Ming-Hau
• Primary Examiner(s): TRA, TUYEN Q
• Application Number:
  US13/337,494
• Publication Number:
  US 20120099177A1
• Time in Patent Office: 1,218 Days
• Field of Search: 359209-292, 359/298, 359/308, 359/318, 359/578, 356/454, 345/85
• US Class Current: 359/291
• 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: G02F 1/1335 Structural association of cells with optical devices, e.g. polarisers or reflectors
• CPC Class Codes: G02F 1/13356 characterised by the placement of the optical elements
• CPC Class Codes: G02F 1/21 by interference

Abstract

A spatial light modulator comprises an integrated optical compensation structure, e.g., an optical compensation structure arranged between a substrate and a plurality of individually addressable light-modulating elements, or an optical compensation structure located on the opposite side of the light-modulating elements from the substrate. The individually addressable light-modulating elements are configured to modulate light transmitted through or reflected from the transparent substrate. Methods for making such spatial light modulators involve fabricating an optical compensation structure over a substrate and fabricating a plurality of individually addressable light-modulating elements over the optical compensation structure. The optical compensation structure may be a passive optical compensation structure. The optical compensation structure may include one or more of a supplemental frontlighting source, a diffuser, a black mask, a diffractive optical element, a color filter, an anti-reflective layer, a structure that scatters light, a microlens array, and a holographic film.

Claims

1. A spatial light modulator, comprising:

a substrate;

a plurality of individually addressable interferometric light-modulating elements configured to modulate light transmitted through the substrate, the interferometric light-modulating elements including a movable reflective layer; and

a plurality of optical compensation structures between the substrate and the plurality of individually addressable interferometric light-modulating elements, at least one of the optical compensation structures including a diffuser.

2. The spatial light modulator of claim 1, wherein at least one of the optical compensation structures includes a black mask.

3. The spatial light modulator of claim 1, wherein at least one of the optical compensation structures includes a color filter.

4. The spatial light modulator of claim 1, wherein at least one of the optical compensation structures includes an anti-reflective layer.

5. The spatial light modulator of claim 1, wherein at least one of the optical compensation structures includes a plurality of scattering elements.

6. The spatial light modulator of claim 1, wherein at least one of the optical compensation structures includes a microlens array.

7. The spatial light modulator of claim 1, wherein at least one of the optical compensation structures includes a holographic film.

8. The spatial light modulator of claim 1, wherein at least one of the optical compensation structures includes a diffractive optical element.

9. The spatial light modulator of claim 1, wherein at least one of the optical compensation structures includes a planarization layer that includes a scattering element.

10. The spatial light modulator of claim 1, wherein at least one of the optical compensation structures includes a passive optical compensation structure.

11. The spatial light modulator of claim 1, further comprising a planarization layer.

12. The spatial light modulator of claim 1, wherein the substrate is partially transparent.

13. The spatial light modulator of claim 1, wherein at least one of the optical compensation structures is between the diffuser and the plurality of individually addressable interferometric light-modulating elements.

14. The spatial light modulator of claim 1, wherein the diffuser is between at least one of the optical compensation structures and the plurality of individually addressable interferometric light-modulating elements.

15. The spatial light modulator of claim 1, further comprising driver electronics.

16. A spatial light modulator, comprising:

a substrate;

a means for interferometrically modulating light transmitted through;

a plurality of means for compensating the light transmitted through the substrate, the plurality of light compensating means between the substrate and the light modulating means, at least one of the light compensating means including a diffuser.

17. The spatial light modulator of claim 16, wherein the light modulating means includes a plurality of interferometric modulators.

18. The spatial light modulator of claim 17, wherein each of the plurality of interferometric modulators includes a movable reflective layer.

19. The spatial light modulator of claim 16, wherein the plurality of light compensating means includes at least one of a black mask, a color filter, an anti-reflective layer, a plurality of scattering elements, a microlens array, a holographic film, a diffractive optical element, and a planarization layer that includes a scattering element.

20. The spatial light modulator of claim 16, wherein at least one of the light compensating means includes a passive optical compensation structure.

21. The spatial light modulator of claim 16, wherein the substrate is partially transparent.

22. The spatial light modulator of claim 16, further comprising a planarization layer.