SYSTEM AND METHOD FOR MATCHING LIGHT SOURCE EMISSION TO DISPLAY ELEMENT REFLECTIVITY

• US 20100157406A1
• Filed: 12/19/2008
• Published: 06/24/2010
• Est. Priority Date: 12/19/2008
• Status: Abandoned Application

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Qualcomm MEMS Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Lee, Chong, Hannan, John Joseph, Xu, Gang, Bita, Ion, Narayanan, Kollengode S., Wang, Lai, Gruhlke, Russell Wayne
• Application Number:
  US12/340,497
• Publication Number:
  US 20100157406A1
• Time in Patent Office: Days
• US Class Current: 359/238
• 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

Abstract

Systems and methods for illuminating interferometric modulator reflective displays are disclosed. One embodiment includes a display including a plurality of interferometric modulators configured to reflect a spectrum of radiation having a reflectance response peak at one or more wavelengths. A plurality of quantum dots are configured to emit radiation having a peak wavelength substantially at said one or more wavelengths, and the display is configured such that light emitted from the quantum dots irradiates the plurality of interferometric modulators.

Claims

1. A display comprising:

a plurality of interferometric modulators configured to reflect a spectrum of radiation having a reflectance response peak at one or more wavelengths, wherein the plurality of interferometric modulators comprises a plurality of first interferometric modulators each having a reflective layer movable relative to a partially reflective layer to form a resonant optical cavity therebetween, and wherein the resonant optical cavities of the first interferometric modulators are configured to reflect a spectrum of radiation having a reflectance response peak at a first wavelength; and

a plurality of quantum dots configured to emit radiation having a peak wavelength substantially at said one or more wavelengths, wherein the plurality of quantum dots includes a plurality of first quantum dots configured to emit radiation having a peak wavelength substantially matching said first wavelength, and

wherein the display is configured such that light emitted from said quantum dots irradiates said plurality of interferometric modulators.

2. The display of claim 1, further comprising a light source that provides radiation to pump said plurality of quantum dots to emit radiation at said one or more wavelengths.

3. The display of claim 1, wherein the plurality of interferometric modulators further comprises a plurality of second interferometric modulators each having a reflective layer movable relative to a partially reflective layer to form a resonant optical cavity therebetween, wherein the resonant optical cavities of the second interferometric modulators are configured to reflect a second spectrum of radiation having a reflectance response peak at a second wavelength, and wherein the plurality of quantum dots further comprises a plurality of second quantum dots configured to emit radiation having a peak wavelength substantially matching said second wavelength.

4. The display of claim 3, wherein said first and second wavelengths are different.

5. The display of claim 3, further comprising:

a plurality of third interferometric modulators each having a reflective layer movable relative to a partially reflective layer to form a resonant optical cavity therebetween, wherein the resonant optical cavities of the third interferometric modulators are configured to reflect a third spectrum of light having a reflectance response peak at a third wavelength; and

a plurality of third quantum dots configured to emit radiation having a peak wavelength substantially matching said third wavelength.

6. The display of claim 5, wherein the peak wavelength of the first quantum dots emitted radiation is within about 10 nm of the first wavelength, and wherein the peak wavelength of the second quantum dots emitted radiation is within about 10 nm of the second wavelength, and wherein the peak wavelength of the third quantum dots emitted radiation is within about 10 nm of the third wavelength.

7. The display of claim 5, wherein

radiation of said first wavelength is blue light;

radiation of said second wavelength is green light; and

radiation said third wavelength is red light.

8. The display of claim 3, wherein said first wavelength is between about 460 nm and about 490 nm.

9. The display of claim 3, wherein said second wavelength is between about 495 nm and about 525 nm.

10. The display of claim 5, wherein said third wavelength is between about 635 nm and about 665 nm.

11. The display of claim 3, wherein

the first wavelength is between about 470 nm and about 480 nm;

the second wavelength is between about 505 nm and about 515 nm; and

the third wavelength is between about 640 nm and about 660 nm.

12. The display of claim 3, further comprising a light source that provides radiation to pump said plurality of quantum dots to emit radiation at said one or more wavelengths.

13. The display of claim 5, further comprising a light source that provides radiation to pump said plurality of first, second and third quantum dots to emit radiation having a peak wavelength substantially at said respective first, second and third wavelengths.

14. The display of claim 1, wherein said plurality of quantum dots essentially comprise material selected from the group consisting of cadmium selenide (CdSe), Calcium sulfide (CdS), Indium arsenide (InAs), and Indium Phosphide (InP).

15. The display of claim 5, wherein

said plurality of first quantum dots range in size between about two (2) nanometers and about five (5) nanometers;

said plurality of second quantum dots range in size between about five (5) nanometers and about ten (10) nanometers; and

said plurality of third quantum dots range in size between about ten (10) nanometers and about fifty (50) nanometers.

16. The display of claim 1, further comprising:

a processor that is in electrical communication with the display, the processor being configured to process image data; and

a memory device in electrical communication with the processor.

17. The display of claim 16, further comprising:

a first controller configured to send at least one signal to the display; and

a second controller configured to send at least a portion of the image data to the first controller.

18. The display of claim 16, further comprising an image source module configured to send the image data to the processor.

19. The display of claim 18, wherein the image source module comprises at least one of a receiver, transceiver, and transmitter.

20. The display of claim 16, further comprising an input device configured to receive input data and to communicate the input data to the processor.

21. The display of claim 1, further comprising:

a light guide having an upper surface, a lower surface and one or more edge surfaces that are configured to receive light, the light guide positioned in front of the at least one interferometric modulator so that the lower surface of the light guide is disposed towards the at least one interferometric modulator; and

a light bar having a light emitting portion that is positioned along at least one of the edge surfaces of the light guide and provides light to said light guide,

wherein said plurality of quantum dots are disposed in said light emitting portion of the light bar.

22. The display of claim 1, further comprising:

a light guide having an upper surface, a lower surface and one or more edge surfaces that are configured to receive light, the light guide positioned in front of the at least one interferometric modulator so that the lower surface of the light guide is disposed towards the at least one interferometric modulator; and

a light bar having a light emitting portion and a light receiving portion, the light emitting portion disposed along an edge surface of the light guide,

wherein said plurality of quantum dots are disposed on said light receiving portion of the light bar.

23. The display of claim 1, further comprising:

a light guide having an upper surface, a lower surface and one or more edge surfaces that are configured to receive light from a light source, the light guide positioned in front of the at least one interferometric modulator so that the lower surface of the light guide is disposed towards the at least one interferometric modulator; and

wherein said quantum dots are disposed on at least one edge surface of said light guide which is configured to receive light.

24. The display of claim 1, further comprising:

a light guide having an upper surface, a lower surface and one or more edge surfaces that are configured to receive light, the light guide positioned in front of the at least one interferometric modulator so that the lower surface of the light guide is disposed towards the at least one interferometric modulator,

wherein said first quantum dots are disposed on the light guide at least partially below the at least one edge surface of the light guide.

25. The display of claim 1, further comprising:

a light guide having an upper surface, a lower surface and one or more edge surfaces that are configured to receive light, the light guide positioned in front of the at least one interferometric modulator so that the lower surface of the light guide is disposed towards the at least one interferometric modulator;

a light bar having a light emitting portion and a light receiving portion, the light emitting portion disposed along an edge surface of the light guide; and

a light source positioned to provide light to the light receiving portion of the light bar.

26. The display of claim 1, wherein said plurality of quantum dots are configured to emit radiation in response to electrical stimulation.

27. The display of claim 1, further comprising a light guide having an upper surface, a lower surface and one or more edge surfaces that are configured to receive light, the light guide positioned in front of the said first interferometric modulators so that the lower surface of the light guide is disposed towards said first interferometric modulators, wherein said plurality of quantum dots are disposed in the light guide.

28. The display of claim 27, wherein at least one of said plurality of quantum dots comprises:

an absorption layer; and

irradiating material disposed below said absorption layer, said irradiating material capable of emitting radiation having a peak wavelength substantially at said first wavelength.

29. A method of illumination, comprising:

illuminating quantum dots with radiation;

emitting radiation from the quantum dots, the emitted radiation having a first peak wavelength substantially matching a first wavelength; and

propagating the emitted radiation to first interferometric modulators each having a reflective layer movable relative to a partially reflective layer to form a resonant optical cavity therebetween, wherein the resonant optical cavities of the first interferometric modulators are configured to reflect a spectrum of radiation having a reflectance response peak substantially at the first wavelength.

30. The method of claim 29, wherein the emitted radiation further has a second peak wavelength substantially matching a second wavelength and a third peak wavelength substantially matching a third wavelength.

31. The method of claim 30, further comprising propagating the emitted radiation to second and third interferometric modulators configured to reflect a spectrum of radiation having a reflectance response peak substantially at the second and third wavelengths, respectively.

32. The method of claim 29, wherein propagating the emitted radiation to the interferometric modulators comprises reflecting the radiation with a light bar.

33. The method of claim 29, wherein propagating the emitted radiation to the interferometric modulators comprises reflecting the radiation with a parabolic mirror.

34. The method of claim 29, wherein propagating the emitted radiation to the interferometric modulators comprises collimating at least a portion of the emitted radiation.

35. The method of claim 29, wherein propagating the emitted radiation to the interferometric modulators comprises propagating the emitted radiation through at least one of glass, plastic, or air.

36. A display comprising:

means to interferometrically modulate light configured to reflect a first spectrum of radiation having a reflectance response peak at a first wavelength; and

means to emit radiation having a peak wavelength substantially at said first wavelength, the display being configured such that said radiation emitting means irradiate said light modulating means.

37. The display of claim 36, wherein the means to interferometrically modulate light comprises a plurality of interferometric modulators.

38. The display of claim 36, wherein the means to emit radiation comprises a plurality of quantum dots.