Electronic reading devices

• US 7,920,320 B2
• Filed: 02/06/2008
• Issued: 04/05/2011
• Est. Priority Date: 02/07/2007
• Status: Expired due to Fees

• Current Assignee: FlexEnable Limited (Plastic Logic JSC)
• Original Assignee: Plastic Logic Limited (Plastic Logic JSC)
• Inventors: Barclay, Duncan, Nirmalananthan, Anusha, Fisher, David, Sandham, Nick, Hayton, Carl, Jones, Simon, Watson, Ben
• Primary Examiner(s): Sawhney; Hargobind S
• Application Number:
  US12/027,176
• Publication Number:
  US 20080298083A1
• Time in Patent Office: 1,154 Days
• Field of Search: 362/98, 362/99, 362/97.1, 362/127, 362/217.04, 362/217.05, 362/296.01, 362/341, 345/84, 345/105, 345/107, 345/173, 345/901, 359/253, 359/254, 359/266, 359/290, 359295-297
• US Class Current: 359/296
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 1/133616 Front illuminating devices
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 1/1677 Structural association of cells with optical devices, e.g. reflectors or illuminating devices
• CPC Class Codes: Y10S 345/901 Electronic book with display

Abstract

The invention relates to electronic devices, in particular consumer electronic devices, including an electrophoactive display, as well as to electronic document reading devices, sometimes called e-readers, such as electronic books. We describe an electronic device including an electroactive display and a light to illuminate said display, wherein said display has a viewing surface, and wherein said light is configured to illuminate said display from in front and to one side of an edge of said viewing surface, across said viewing surface and through a front-most surface of said display.

Claims

1. An electronic device including an electroactive, reflective display and a light to illuminate said display, wherein said display has a viewing surface, and wherein said light is configured to provide a stripe of illumination along an edge of said viewing surface and directed across the viewing surface and through the viewing surface, wherein said viewing surface is an outer-most surface of said display and is configured to reflect light from said stripe directly to a user to allow the user to view an image displayed on said display, and wherein said viewing surface has a concave curvature towards said stripe such that said illumination from said stripe provides uniform illumination over a majority of said viewing surface.

2. An electronic device as claimed in claim 1 wherein said light is configured to provide said a stripe of illumination along substantially a complete edge of said viewing surface and directed across said viewing surface.

3. An electronic device as claimed in claim 2 wherein said light comprises a plurality of LEDs.

4. An electronic device as claimed in claim 1 wherein said light comprises a light source at least partially behind said edge of said viewing surface of said display and an optical system to direct illumination from said light source onto said viewing surface from the front of said edge of said viewing surface.

5. An electronic device as claimed in claim 1 including two said electroactive displays mounted on a central support, and wherein said light is mounted within said central support.

6. An electronic device as claimed in claim 1 wherein said light is configured to change colour, and wherein said device includes a system to control a colour of said light in coordination with information displayed on said device.

7. An electronic device as claimed in claim 1 wherein said device is an electronic book.

8. An electronic device as claimed claim 1 wherein said electroactive display has an active matrix organic electronic backplane.

9. An electronic device as claimed in claim 1, wherein said electroactive display comprises an electrophoretic display.

10. An electronic document reading device comprising an electronic device according to claim 1 and at least one page attached to a spine, wherein said page has said display having said viewing surface.

11. An electronic document reading device as claimed in claim 10 wherein said spine includes an illumination source and a window having the form of a stripe along said spine in front of an edge of said viewing surface where said page is attached to said spine, and wherein illumination from said illumination source is directed through said window onto said viewing surface.

12. An electronic document reading device as claimed in claim 11 configured to selectively illuminate one of said pages currently being read.

13. An electronic document reading device as claimed in claim 10 having two said pages, one attached to each side of said spine, and wherein each of said pages is illuminable from said spine.

14. An electronic document reading device as claimed in claim 10 further comprising a colour control system to change a colour of said illumination.

15. An electronic document reading device as claimed in claim 14 wherein said colour control system is configured to automatically change said colour of said illumination in accordance with an emotional content of material displayed by said reading device on said viewing surface.

16. An electronic document reading device as claimed in claim 10 wherein said page comprises an electroactive display with a solution-deposited electronic backplane.

17. An electronic document reading device as claimed in claim 16, wherein said electroactive display comprises an electrophoretic display.

18. An electronic document reading device as claimed in claim 10 having a clamshell configuration, with a first physical page and a second physical page hinged at said spine to enable said clamshell to be opened and closed, each said page having a front surface bearing an electronic display which, when said clamshell is closed, is on the inside of said closed clamshell, the rear surfaces of said physical pages providing respective front and rear surfaces of an electronic book when said clamshell is closed, and wherein when said clamshell is closed said front and rear surfaces of said electronic book taper towards an edge of said book opposite said spine.

19. An electronic document reading device as claimed in claim 18 wherein when said clamshell is closed a part of said electronic book adjacent said edge opposite said spine has an overall three-dimensional shape which is generally wedge-shaped.

20. An electronic document reading device as claimed in claim 19 wherein a thickness of a said physical page tapers towards an edge of a said physical page opposite said spine.

21. An electronic document reading device as claimed in claim 19 including display drive and control circuitry, wherein a said electronic display has a set of connections to said display drive and control circuitry along two edges, and wherein said edges do not include an edge of a said physical page opposite said spine.

22. An electronic document reading device as claimed in claim 10 having two physical pages each with an electronic page display, said physical pages being hingedly mounted at said spine in a clamshell configuration, said electronic page display being on an inside surface of said reading device when said clamshell is closed, and wherein said reading device includes an external display viewable from the outside of said device when said clamshell is closed.

23. An electronic document reading device as claimed in claim 22 including a user control accessible from the outside of said device when said clamshell is closed, and control electronics coupled to said user control and to said external display to enable a user to selectively display information relating to an internal state of said device on said external display when said clamshell is closed.

24. An electronic document reading device as claimed in claim 23 wherein said user control comprises a wheel mounted on said spine.

25. An electronic document reading device as claimed in claims 23 wherein said control electronics is configured to change at least one function of said user control between open and closed configurations of said clamshell.

26. An electronic document reading device as claimed in claim 10 having two physical pages each with an electronic page display, said physical pages being hingedly mounted at said spine in a clamshell configuration, said reading device further comprising control electronics coupled to memory for storing one or more documents to be read, coupled to said electronic page displays for displaying selected pages of a said document to be read, and coupled to a user control for changing said selected displayed pages, and wherein said user control comprises a thumb paddle towards a base of said spine.

27. An electronic document reading device as claimed in claim 26 wherein said thumb paddle is moveable laterally in two orthogonal directions, and vertically into said spine, to control said reading device.

28. A method of illuminating an electroactive, reflective display of an electronic device, the method comprising:

configuring the display such that a viewing surface of the display has a concave curvature in one direction, from a viewing side of the display; and

using a light to provide a stripe of illumination along an edge of said viewing surface and directed across said viewing surface, wherein said viewing surface is an outer-most surface of said display and is configured to reflect light from said stripe directly to a user to allow a said user on said viewing side to view an image displayed on said display,

wherein said concave curvature is towards said stripe and such that said illumination from said stripe provides uniform illumination over a majority of said viewing surface.

29. A method as claimed in claim 28 wherein said electroactive display comprises an electrophoretic display.