Integrated Liquid Crystal Display And Touchscreen For An Electronic Device

• US 20080150901A1
• Filed: 12/22/2006
• Published: 06/26/2008
• Est. Priority Date: 12/22/2006
• Status: Abandoned Application

• Current Assignee: Blackberry Limited
• Original Assignee: Blackberry Limited
• Inventors: Lowles, Robert, Hui, Edward, Ma, Zhongming
• Application Number:
  US11/615,138
• Publication Number:
  US 20080150901A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

Abstract

An integrated display for an electronic device, comprising: a liquid crystal display having a first polarizing layer coupled to a colour filter layer; and, a first transparent conductive material layer disposed between the first polarizing layer and the colour filter layer to thereby form a capacitive touchscreen sensor.

Claims

1. An integrated display for an electronic device, comprising:

a liquid crystal display having a first polarizing layer coupled to a colour filter layer; and

,

a first transparent conductive material layer disposed between the first polarizing layer and the colour filter layer to thereby form a capacitive touchscreen sensor.

2. The integrated display of claim 1 wherein the first transparent conductive material layer is disposed on an upper surface of the colour filter layer.

3. The integrated display of claim 2 wherein the colour filter layer has one or more colour filters disposed on a lower surface thereof.

4. The integrated display of claim 3 wherein the liquid crystal display further comprises:

a second transparent conductive material layer formed on a lower surface of the colour filter layer and acting as a common electrode for thin film transistors disposed on an upper surface of a thin film transistor layer;

a liquid crystal layer disposed between the second transparent conductive material layer and the thin film transistor layer, each thin film transistor on the thin film transistor layer being selectable to apply a voltage across the liquid crystal layer to activate liquid crystals for a respective pixel;

a second polarizing layer coupled to a lower surface of the thin film transistor layer; and

, a backlight for illuminating the integrated display through a lower surface of the second polarizing layer.

5. The integrated display of claim 4 and further comprising a first module for controlling activation of the thin film transistors to thereby present images on the integrated display.

6. The integrated display of claim 5 and further comprising a second module for monitoring the capacitive touchscreen sensor for changes in capacitance caused by a touch of a user and for determining a location of the touch from the changes in capacitance.

7. The integrated display of claim 6 wherein the monitoring by the second module is synchronized with the controlling of the first module to thereby reduce electrical interference.

8. The integrated display of claim 1 wherein the electronic device is a handheld electronic device.

9. The integrated display of claim 1 wherein the colour filter layer is composed of glass or plastic.

10. The integrated display of claim 4 wherein one of the backlight and the thin film transistor layer is a reflector.

11. The integrated display of claim 1 wherein the transparent conductive material includes a conducting oxide.

12. The integrated display of claim 11 wherein the conducting oxide includes one or more of indium tin oxide, titanium oxide, nickel oxide, zinc oxide, indium, tin, nickel, and zinc.

13. An integrated display for an electronic device, comprising:

a liquid crystal display having a protective lens coupled to a first polarizing layer; and

,

a first transparent conductive material layer disposed between the protective lens and the first polarizing layer to thereby form a capacitive touchscreen sensor.

14. The integrated display of claim 13 wherein the first transparent conductive material layer is disposed on a lower surface of the protective lens.

15. The integrated display of claim 14 wherein the liquid crystal display further comprises:

a colour filter layer coupled to a lower surface of the first polarizing layer;

a second transparent conductive material layer formed on a lower surface of the colour filter layer and acting as a common electrode for thin film transistors disposed on an upper surface of a thin film transistor layer;

a liquid crystal layer disposed between the second transparent conductive material layer and the thin film transistor layer, each thin film transistor on the thin film transistor layer being selectable to apply a voltage across the liquid crystal layer to activate liquid crystals for a respective pixel;

a second polarizing layer coupled to a lower surface of the thin film transistor layer; and

, a backlight for illuminating the integrated display through a lower surface of the second polarizing layer.

16. The integrated display of claim 15 wherein the colour filter layer has one or more colour filters disposed on the lower surface thereof.

17. The integrated display of claim 16 and further comprising a first module for controlling activation of the thin film transistors to thereby present images on the integrated display.

18. The integrated display of claim 17 and further comprising a second module for monitoring the capacitive touchscreen sensor for changes in capacitance caused by a touch of a user and for determining a location of the touch from the changes in capacitance.

19. The integrated display of claim 18 wherein the monitoring by the second module is synchronized with the controlling of the first module to thereby reduce electrical interference.

20. The integrated display of claim 13 wherein the electronic device is a handheld electronic device.

21. The integrated display of claim 13 wherein the colour filter layer is composed of glass or plastic.

22. The integrated display of claim 15 wherein one of the backlight and the thin film transistor layer is a reflector.

23. The integrated display of claim 13 wherein the transparent conductive material includes a conducting oxide.

24. The integrated display of claim 25 wherein the conducting oxide includes one or more of indium tin oxide, titanium oxide, nickel oxide, zinc oxide, indium, tin, nickel, and zinc.

25. The integrated display of claim 13 wherein the protective lens is bounded to the first polarizing layer with an adhesive layer to thereby reduce air gaps between the protective lens and the first polarizing layer.

26. The integrated display of claim 25 wherein the liquid crystal display has a colour filter layer coupled to a lower surface of the first polarizing layer and wherein the capacitive sensor includes a third transparent conductive material layer disposed between the first polarizing layer and the colour filter layer.