SEMI-TRANSPARENT DISPLAY APPARATUS

• US 20120268669A1
• Filed: 10/20/2011
• Published: 10/25/2012
• Est. Priority Date: 03/28/2008
• Status: Active Grant

• Current Assignee: Motorola Mobility, Inc. (Lenovo Group Ltd.)
• Original Assignee: Motorola Mobility, Inc. (Lenovo Group Ltd.)
• Inventors: Ishikawa, Tomohiro, Gitzinger, Thomas
• Granted Patent: US 8,508,679 B2
• Time in Patent Office: Days
• US Class Current: 349/12
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133557 Half-mirrors
• CPC Class Codes: G02F 1/133602 Direct backlight
• CPC Class Codes: G02F 1/13478 based on selective reflection
• CPC Class Codes: G02F 1/13718 based on a change of the texture state of a cholesteric liquid crystal
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 59/10 OLED displays
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/50 OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

Abstract

A semitransparent display (100), suitable for use with an electronic device (700), is provided. The semitransparent display (100), in one embodiment, includes a cholesteric liquid crystal display layer (101) and a translucent electroluminescent layer (102), such as an organic light emitting diode device. Control circuitry (109) is coupled to each layer, and is configured to selectively actuate each layer. The cholesteric liquid crystal display layer (101) can be operated in any of a planar mode (201), a focal conic mode (202), or a homeotropic mode (203). Segments of the cholesteric liquid crystal display layer (101) can be selectively actuated so as to hide and reveal user actuation targets. Capacitive sensors (620, 621) can be included so that the semitransparent display (100) works as a touch sensitive user interface. A user can see an object, such as a hand (105) or stylus, from above the semitransparent display (100) when the hand (105) or stylus is placed beneath the semitransparent display (100).

Claims

1. A device having a semitransparent display, the semitransparent display comprising:

a cholesteric liquid crystal display layer;

a translucent electroluminescent layer disposed beneath the cholesteric liquid crystal display layer; and

control circuitry coupled to and configured to selectively actuate each of the cholesteric liquid crystal display layer and the translucent electroluminescent layer.

2. The semitransparent display of claim 1, wherein the cholesteric liquid crystal display layer is configured to operate in one of at least a planar mode, a focal-conic mode, or a homeotropic mode.

3. The semitransparent display of claim 2, wherein the control circuitry is configured to operate portions of the cholesteric liquid crystal display layer in one of the homeotropic mode or the focal-conic mode when the translucent electroluminescent layer is OFF.

4. The semitransparent display of claim 2, wherein the control circuitry is configured to operate portions of the cholesteric liquid crystal display layer in the planar mode, and other portions of the cholesteric liquid crystal display layer in one of the focal-conic mode or the homeotropic mode when the translucent electroluminescent layer is ON.

5. The semitransparent display of claim 2, wherein the control circuitry is configured to operate portions of the cholesteric liquid crystal display layer in the planar mode, and other portions of the cholesteric liquid crystal display layer in one of the focal-conic mode or the homeotropic mode when the translucent electroluminescent layer is OFF.

6. The semitransparent display of claim 5, wherein the semitransparent display comprises a top display section and a bottom display section, further wherein when the translucent electroluminescent layer is ON, light from the translucent electroluminescent layer projects through the bottom display section and through portions of the top display section where the cholesteric liquid crystal display layer is in one of the focal-conic mode or the homeotropic mode.

7. The semitransparent display of claim 1, wherein the translucent electroluminescent layer comprises an organic light emitting diode display.

8. The semitransparent display of claim 1, wherein the translucent electroluminescent layer comprises a transparent and segment electroluminescent display.

9. The semitransparent display of claim 1, wherein the semitransparent display comprises a transmissivity in a display region of at least twenty-five percent.

10. The semitransparent display of claim 1, wherein the cholesteric liquid crystal display layer comprises a single cholesteric liquid crystal layer having a pitch associated therewith configured to reflect a predetermined spectrum of light.

11. The semitransparent display of claim 1, further comprising a capacitive touch sensor disposed along the semitransparent display and coupled to the control circuitry.

12. The semitransparent display of claim 11, wherein the semitransparent display comprises a top display section and a bottom display section, wherein the capacitive touch sensor is at least configured to detect objects contacting the bottom display section.

13. The semitransparent display of claim 1, wherein the cholesteric liquid crystal display layer comprises a plurality of transparent electrodes disposed upon a substrate, wherein at least some of the plurality of transparent electrodes are configured as user actuation targets.

14. The semitransparent display of claim 1, wherein the cholesteric liquid crystal display is matrix addressable.

15. The semitransparent display of claim 1, further comprising an ambient light detector coupled to the control circuitry, wherein when ambient light detected by the ambient light detector is above a predetermined threshold, the control circuitry is configured to deactuate the translucent electroluminescent layer.

16. (canceled)

17. (canceled)

18. (canceled)

19. A portable electronic device comprising a touch sensitive user interface having an upper surface and a lower surface, wherein the touch sensitive user interface is at least capable of actuation along the lower surface, wherein the touch sensitive user interface comprises a cholesteric liquid crystal display layer and a transparent electroluminescent device configured to selectively project light through the upper surface and the lower surface.

20. The portable electronic device of claim 19, wherein the cholesteric liquid crystal display layer comprises a single layer cholesteric liquid crystal display layer having a transmissivity of fifty percent or more when the cholesteric liquid crystal display layer is in a focal-conic mode or a homeotropic mode.