Color display and solar cell device

• US 20040017524A1
• Filed: 07/25/2002
• Published: 01/29/2004
• Est. Priority Date: 07/25/2002
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Li, Zili
• Application Number:
  US10/205,458
• Publication Number:
  US 20040017524A1
• Time in Patent Office: Days
• US Class Current: 349/106
• CPC Class Codes: G02F 1/13324 Circuits comprising solar cells
• CPC Class Codes: G02F 1/133516 Methods for their manufacture, e.g. printing, electro-deposition or photolithography
• CPC Class Codes: G02F 1/133521 Interference filters

Abstract

Color displays such as color liquid crystal displays (105) and touch sensitive displays (510) include a substantially transparent back plate (120) or backside and are stacked with one or more solar cells (150) such that light passing through the displays will illuminate the light receiving active surface of the solar cells (150). A pixelized color reflector (121) is used that comprises a patterned color reflector. The resultant display/solar cell can be utilized in combination with a portable electronic device (720) such as a wireless communications device, with the solar cell (150) providing electricity to the display (710), the portable electronic device (720), or both. A mask (810) can be used to occlude surface features on the solar cell (150) as appropriate to provide a substantially uniformly colored appearance.

Claims

1. A device comprising:

a color display comprising

a liquid crystal display panel having a back plate and a front plate that are substantially transparent, and having a pattern of liquid crystal pixels,

a polarizer, and

a pixelized color reflector disposed substantially parallel to the back plate of the display having a pattern of color band pixel reflectors that corresponds to the pattern of liquid crystal pixels; and

a solar cell having a substantially uniform dark-colored light-receiving active surface disposed proximal to a back plate of the pixelized color reflector such that at least some light passing from the front plate and through the back plate of the pixelized color reflector will illuminate the light-receiving active surface.

2. The device of claim 1 wherein the liquid crystal display panel comprises one of supertwist nematic and twisted nematic liquid crystal material between the back plate and the front plate.

3. The device of claim 1 wherein each of the color band pixel reflectors reflects one of a plurality of color bands and is substantially transparent to light that is not within the one of the plurality of color bands.

4. The device of claim 1 wherein the polarizer is proximal to the front plate of the liquid crystal display.

5. The device of claim 1 wherein the light-receiving active surface is substantially black-colored.

6. The device of claim 1 wherein the solar cell comprises a plurality of solar cell devices.

7. A portable electronic device comprising the device of claim 1, and further comprising a user interface operably coupled to the display.

8. A portable electronic device comprising the device of claim 1 and further comprising a battery that is charged by the solar cell.

9. A portable electronic device comprising the device of claim 1 wherein an electricity output of the solar cell is operably coupled to the portable device.

10. A device comprising:

a touch sensitive display having a substantially transparent backside;

a color display comprising

a liquid crystal display panel having a back plate and a front plate that are substantially transparent, and having a pattern of liquid crystal pixels,

a polarizer, and

a pixelized color reflector disposed substantially parallel to the back plate of the display having a pattern of color band pixel reflectors that corresponds to the pattern of liquid crystal pixels; and

a solar cell having a substantially uniform dark-colored light-receiving active surface disposed proximal to a backside of at least one of the pixelized color reflector and the touch sensitive display such that at least some light passing through at least one of the display and the touch sensitive display will illuminate the light-receiving active surface.

11. The device of claim 10 wherein the liquid crystal display panel comprises one of supertwist nematic and twisted nematic liquid crystal material between the back plate and the front plate.

12. The device of claim 10 wherein each of the color band pixel reflectors reflects one of a plurality of color bands and is substantially transparent to light that is not within the one of the plurality of color bands.

13. The device of claim 10 wherein the polarizer is proximal to the front plate of the liquid crystal display panel.

14. The device of claim 10 wherein the light-receiving active surface is substantially black-colored.

15. The device of claim 10 wherein the solar cell comprises a plurality of solar cell devices.

16. A portable electronic device comprising the device of claim 10 and further comprising a user interface operably coupled to the display.

17. A portable electronic device comprising the device of claim 10 and further comprising a battery that is charged by the solar cell.

18. A portable electronic device comprising the device of claim 10 wherein an electricity output of the solar cell is operably coupled to the portable device.

19. The device of claim 10, wherein the touch sensitive display is co-extensive with substantially the entire display.

20. The device of claim 10, wherein the touch sensitive display is essentially contiguous to the display.