Integrated modulator illumination

• US 7,706,050 B2
• Filed: 03/05/2004
• Issued: 04/27/2010
• Est. Priority Date: 03/05/2004
• Status: Expired due to Fees

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Qualcomm MEMS Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Sampsell, Jeffrey B.
• Primary Examiner(s): Mack; Ricky L
• Assistant Examiner(s): Thomas; Brandi N
• Application Number:
  US10/794,825
• Publication Number:
  US 20050195468A1
• Time in Patent Office: 2,244 Days
• Field of Search: 359/290, 359/291, 359/292, 359/297, 359/298, 359/245, 359/231, 362/245, 362/231, 345/245, 345/231
• US Class Current: 359/292
• 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 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer

Abstract

A spatial light modulator includes an array of elements to modulate light in accordance with image data. The modulator has a display panel having first and second surfaces arranged adjacent to the array of elements such that the second surface is directly adjacent the array of elements to allow a viewer to view an image produced by modulation of light. The modulator may also include a light source to provide light to the display panel and illumination dots on the first surface of the display panel to reflect light from the source to the array of elements.

Claims

1. A spatial light modulator, comprising:

an array of display elements configured to modulate light in accordance with image data, said array of display elements comprising interferometric modulators;

a display panel comprising a transparent substrate having forward and rearward surfaces arranged adjacent to the array of display elements such that the rearward surface is directly adjacent the array of display elements to allow a viewer to view an image produced by modulation of light, the substrate including a plurality of edges defined between said forward and rearward surfaces;

a light source comprising an edge light, the edge light disposed laterally with respect to at least one of said edges of the transparent substrate, the light source configured to inject light into at least one edge of said substrate such that light is guided through the substrate due to total internal reflection; and

reflective elements disposed on the forward surface of the substrate, the reflective elements configured to reflect the light guided due to total internal reflection through the substrate, thereby directing said light guided through the substrate due to total internal reflection to the array of display elements.

2. The spatial light modulator of claim 1, wherein the transparent substrate comprises glass.

3. The spatial light modulator of claim 1, the display panel further comprising a diffuser, wherein the diffuser is arranged on the forward surface of the transparent substrate, and wherein the reflective elements are disposed at an interface between the diffuser and the transparent substrate.

4. The spatial light modulator of claim 3, wherein the reflective elements reside on the diffuser.

5. The spatial light modulator of claim 3, wherein the reflective elements reside on the substrate.

6. The spatial light modulator of claim 1, wherein the display panel further comprises an antireflective film.

7. The spatial light modulator of claim 1, wherein the light source comprises a light emitting diode.

8. The spatial light modulator of claim 1, wherein the reflective elements comprise illumination dots.

14. The spatial light modulator of claim 1, wherein said reflective elements are arranged to provide uniform illumination.

20. The spatial light modulator of claim 1, wherein said light is guided through the substrate due to total internal reflection from the forward and rearward surfaces of the substrate.

9. A spatial light modulator, comprising:

means for modulating light in accordance with image data, said modulating means comprising interferometric modulators;

means for supporting said modulating means during fabrication of said modulation means, said supporting means having forward and rearward surfaces, said rearward surface of said supporting means being located directly adjacent to said modulating means to allow a viewer to view an image produced by modulation of light, the supporting means including a plurality of edges defined between said forward and rearward surfaces;

means for edge illuminating the supporting means, said edge illuminating means disposed laterally with respect to at least one of the edges of said supporting means to inject light into at least one edge of the supporting means such that light is guided through the supporting means due to total internal reflection; and

means for scattering said light guided due to total internal reflection through supporting means, said light scattering means located on said forward surface of said supporting means, thereby directing said light guided through the supporting means due to total internal reflection to said modulating means.

10. The spatial light modulator of claim 9, further comprising means for diffusing light.

11. The spatial light modulator of claim 9, further comprising means for inhibiting reflection of ambient light.

12. The spatial light modulator of claim 9, wherein said supporting means comprises a substrate.

13. The spatial light modulator of claim 9, wherein said scattering means comprises illumination dots.

15. The spatial light modulator of claim 11, wherein said ambient light reflection inhibiting means comprises an anti-reflective coating.

16. The spatial light modulator of claim 9, wherein said edge illuminating means light providing means comprises a light emitting diode.

17. The spatial light modulator of claim 9, wherein said edge illuminating means light providing means comprises a cold cathode fluorescent tube.

18. The spatial light modulator of claim 9, wherein said edge illuminating means comprises an edge emitting light pipe.

19. The spatial light modulator of claim 18, wherein said edge emitting light pipe is illuminated by a light emitting diode.

21. The spatial light modulator of claim 9, wherein said light is guided through the supporting means due to total internal reflection from the forward and rearward surfaces of the supporting means.