Display with integrated photovoltaics

• US 8,169,686 B2
• Filed: 10/20/2008
• Issued: 05/01/2012
• Est. Priority Date: 10/19/2007
• Status: Expired due to Fees

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Qualcomm MEMS Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Kothari, Manish, Khazeni, Kasra
• Primary Examiner(s): Mack, Ricky
• Assistant Examiner(s): Patel, Vipin
• Application Number:
  US12/254,782
• Publication Number:
  US 20090103165A1
• Time in Patent Office: 1,289 Days
• Field of Search: 359290-296
• US Class Current: 359/290
• 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 26/0841 the reflecting element being moved or deformed by electrostatic means
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G02F 1/13324 Circuits comprising solar cells
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: H01L 31/043 Mechanically stacked PV cells
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

A display with patterned photovoltaic (PV) material integrated on the front side and/or back side of the display is disclosed. Light may reach PV material situated behind a display through fully or partially transmissive features or gaps within the display. Display-generated light may also reach PV material behind a display. A patterned PV material situated in front of a display may collect both ambient light as well as display-generated light.

Claims

1. A display device displaying an image toward a front side, with a back side opposite the front side, the display device comprising:

a reflective interferometric modulator display comprising an array region having a front side and a back side, the array region including active pixel areas and inactive areas, wherein the active pixel areas comprise reflective electromechanical systems devices;

a photovoltaic cell including a photovoltaic material, wherein the photovoltaic material is formed over one of the front side and the back side of the array region, and wherein the photovoltaic material is patterned to correspond to a pattern of at least some of the inactive areas, the pattern including inactive areas separating adjacent active pixel areas; and

a power supply, wherein the photovoltaic cell is configured to provide power to the power supply.

2. The device of claim 1, wherein the photovoltaic material comprises a deposited thin film photovoltaic material.

3. The device of claim 1, wherein the photovoltaic material further serves as a black mask to reduce reflections in the inactive areas of the array region.

4. The device of claim 3, wherein the photovoltaic material is configured to reflect or transmit less than 10% of visible light incident upon the photovoltaic material.

5. The device of claim 4, wherein the photovoltaic material is capable of receiving light from both the front and back sides of the photovoltaic material.

6. The device of claim 1, wherein the photovoltaic material is formed over the back side of the array region.

7. The device of claim 6, wherein a front side electrode is separated from a back side electrode by one of a dielectric buffer layer and a thinned portion of the photovoltaic material.

8. The device of claim 7, wherein the active pixel areas comprise microelectromechanical systems (MEMS) devices.

9. The device of claim 8, wherein the MEMS devices comprise interferometric modulators.

10. The device of claim 7, wherein the inactive areas comprise transparent inactive structures capable of allowing ambient light to reach the photovoltaic material and wherein the photovoltaic material is patterned to correspond to a pattern of the inactive structures.

11. The device of claim 10, wherein the transparent inactive structures comprise spaces between pixel areas.

12. The device of claim 1, wherein the photovoltaic material is formed over the front side of the array region.

13. The device of claim 12, wherein the photovoltaic material is patterned to mask the inactive areas of the array region.

14. The device of claim 13, wherein the active pixel areas comprise microelectromechanical systems (MEMS) devices.

15. The device of claim 14, wherein the MEMS device comprises an interferometric modulator.

16. The device of claim 13, further comprising a transparent conducting film in electrical contact with the photovoltaic material.

17. The device of claim 16, wherein the photovoltaic material is capable of receiving light incident upon the photovoltaic material through the transparent conducting film from the front and the back of the photovoltaic cell.

18. The device of claim 16, wherein the display comprises a backlight.

19. The device of claim 1, wherein the photovoltaic material is patterned to include islands of photovoltaic material.

20. The device of claim 19, wherein the photovoltaic material is patterned to correspond to inactive areas including one of etch holes or pillars.

21. A display device displaying an image toward a front side, with a back side opposite the front side, the display device comprising:

a display comprising an array region having a front side and a back side, the array region comprising active pixel areas and inactive areas, wherein the active pixel areas comprise reflective electromechanical systems devices;

a photovoltaic cell comprising a photovoltaic material, wherein the photovoltaic material is formed over one of the front side and the back side of the array region, and wherein the photovoltaic material is patterned; and

a transparent conducting film in electrical contact with the photovoltaic material;

wherein the photovoltaic material further serves as a black mask to reduce reflections in the inactive areas of the array region;

wherein the photovoltaic material is configured to reflect or transmit less than 10% of visible light incident upon the photovoltaic material; and

wherein the photovoltaic material is capable of receiving light from both the front and back sides of the photovoltaic material.

22. The device of claim 21, wherein the photovoltaic material is patterned to expose the active pixel areas and align with at least some of the inactive areas.

23. The device of claim 22, wherein the inactive areas include areas separating adjacent active pixel areas.

24. The device of claim 21, wherein the photovoltaic material comprises a deposited thin film photovoltaic material.

25. A method of manufacturing a display device, the display device configured to display an image toward a front side, with a back side opposite the front side, the method comprising:

providing a reflective interferometric modulator display including an array region, the array region including active pixel areas and inactive areas, wherein the active pixel areas comprise reflective microelectromechanical systems (MEMS) devices;

disposing a photovoltaic material over one of the front side and the back side of the array region, patterning the photovoltaic material to correspond to a pattern of at least some of the inactive areas, the pattern including inactive areas separating adjacent active pixel areas; and

a power supply, wherein the photovoltaic material is configured to provide power to the power supply.

26. The method of claim 25, further including aligning the patterned photovoltaic material with the pattern of the inactive areas.

27. A display device displaying an image toward a front side, with a back side opposite the front side, the display device comprising:

a reflective interferometric modulator display including an array region, the array region including active pixel areas and inactive areas, wherein the active pixel areas comprise reflective electromechanical systems devices;

a photovoltaic cell including a photovoltaic material, wherein the photovoltaic material is formed over the back side of the array region, and wherein the photovoltaic material is patterned to correspond to a pattern of at least some of the inactive areas, the pattern including inactive areas separating adjacent active pixel areas; and

a power supply, wherein the photovoltaic cell is configured to provide power to the power supply.

28. The display device of claim 27, wherein the pattern further includes isolated inactive areas formed within the active pixel areas.