Hybrid display assembly including a solar cell

Patent metadata

Field	Value
Publication number	US-2016104751-A1
Application number	US-201514794132-A
Country	US
Kind code	A1
Filing date	Jul 8, 2015
Priority date	Oct 10, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

A display assembly for a portable object includes a first, at least partially transparent, emissive display device located on the side of an observer, a second reflective display device and a solar cell being arranged, in that order, underneath the first emissive display device. The second reflective display device is capable of switching between a transparent state, in which the device does not display any information, and a reflective state, when activated.

First claim

1 . A display assembly for a portable object, comprising:
a first, at least partially transparent, emissive display device located on the side of an observer, a second reflective display device and a solar cell being arranged, in that order, underneath the first emissive display device, the second reflective display device being capable of switching between a transparent state, in which the device does not display any information, and a reflective state, when activated.

2 . The display assembly according to claim 1 , wherein the emissive display device is bonded on the reflective display device.

3 . The display assembly according to claim 2 , wherein the emissive display device is bonded on the reflective display device by means of an adhesive film or a liquid adhesive layer.

4 . The display assembly according to claim 1 , wherein the first emissive display device includes a transparent emissive display cell, and wherein the second reflective display device includes a reflective liquid crystal display cell.

5 . The display assembly according to claim 4 , wherein the transparent emissive display cell is a transparent emissive organic light emitting diode display cell or a transparent emissive inorganic display cell.

6 . The display assembly according to claim 5 , wherein the transparent emissive organic light emitting diode display cell includes a stack of electroluminescent layers sandwiched between a transparent upper electrode and a transparent lower electrode.

7 . The display assembly according to claim 5 , wherein the reflective liquid crystal display cell is selected from the group comprising twisted nematic liquid crystal cells, super twisted nematic liquid crystal cells and vertically aligned liquid crystal display cells and wherein the addressing of these liquid crystal display cells may be of the direct type, the active matrix type or the passive matrix multiplexing type.

8 . The display assembly according to claim 6 , wherein the reflective liquid crystal display cell is selected from the group comprising twisted nematic liquid crystal cells, super twisted nematic liquid crystal cells and vertically aligned liquid crystal display cells and wherein the addressing of these liquid crystal display cells may be of the direct type, the active matrix type or the passive matrix multiplexing type.

9 . The display assembly according to claim 5 , wherein an absorbent polarizer is arranged on an upper face of the reflective liquid crystal display cell, and wherein a reflective polarizer is arranged underneath a lower face of the rear substrate of the reflective liquid crystal display cell.

10 . The display assembly according to claim 6 , wherein an absorbent polarizer is arranged on an upper face of the reflective liquid crystal display cell, and wherein a reflective polarizer is arranged underneath a lower face of the rear substrate of the reflective liquid crystal display cell.

11 . The display assembly according to claim 7 , wherein an absorbent polarizer is arranged on an upper face of the reflective liquid crystal display cell, and wherein a reflective polarizer is arranged underneath a lower face of the rear substrate of the reflective liquid crystal display cell.

12 . The display assembly according to claim 8 , wherein an absorbent polarizer is arranged on an upper face of the reflective liquid crystal display cell, and wherein a reflective polarizer is arranged underneath a lower face of the rear substrate of the reflective liquid crystal display cell.

13 . The display assembly according to claim 5 , wherein a circular polarizer, that is formed of an absorbent polarizer and a first quarter-wave plate, is placed above the transparent emissive organic light emitting diode display cell, and wherein a second quarter-wave plate is placed underneath the transparent emissive organic light emitting diode display cell.

14 . The display assembly according to claim 6 , wherein a circular polarizer, that is formed of an absorbent polarizer and a first quarter-wave plate, is placed above the transparent emissive organic light emitting diode display cell, and wherein a second quarter-wave plate is placed underneath the transparent emissive organic light emitting diode display cell.

15 . The display assembly according to claim 7 , wherein a circular polarizer, that is formed of an absorbent polarizer and a first quarter-wave plate, is placed above the transparent emissive organic light emitting diode display cell, and wherein a second quarter-wave plate is placed underneath the transparent emissive organic light emitting diode display cell.

16 . The display assembly according to claim 8 , wherein a circular polarizer, that is formed of an absorbent polarizer and a first quarter-wave plate, is placed above the transparent emissive organic light emitting diode display cell, and wherein a second quarter-wave plate is placed underneath the transparent emissive organic light emitting diode display cell.

17 . The display assembly according to claim 9 , wherein a circular polarizer, that is formed of an absorbent polarizer and a first quarter-wave plate, is placed above the transparent emissive organic light emitting diode display cell, and wherein a second quarter-wave plate is placed underneath the transparent emissive organic light emitting diode display cell.

18 . The display assembly according to claim 10 , wherein a circular polarizer, that is formed of an absorbent polarizer and a first quarter-wave plate, is placed above the transparent emissive organic light emitting diode display cell, and wherein a second quarter-wave plate is placed underneath the transparent emissive organic light emitting diode display cell.

19 . The display assembly according to claim 11 , wherein a circular polarizer, that is formed of an absorbent polarizer and a first quarter-wave plate, is placed above the transparent emissive organic light emitting diode display cell, and wherein a second quarter-wave plate is placed underneath the transparent emissive organic light emitting diode display cell.

20 . The display assembly according to claim 12 , wherein a circular polarizer, that is formed of an absorbent polarizer and a first quarter-wave plate, is placed above the transparent emissive organic light emitting diode display cell, and wherein a second quarter-wave plate is placed underneath the transparent emissive organic light emitting diode display cell.

21 . The portable object including a display assembly according to claim 1 .

22 . The portable object according to claim 21 , wherein the object is a wristwatch.

Assignees

• Swatch Group Res & Dev Ltd

Inventors

• Sagardoyburu Michel

Classifications

• G02F2001/13324

  Physics · mapped topic

• G02F2001/133638

  Physics · mapped topic

• H01L27/3232

  Electricity · mapped topic

• G02F1/133536

  Reflective polarizers (G02F1/13362 takes precedence) · CPC title

• G02F1/13306

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title