Touch-sensitive liquid crystal display device with built-in touch mechanism andmethod and method for driving same

• US 20090289912A1
• Filed: 05/26/2009
• Published: 11/26/2009
• Est. Priority Date: 05/23/2008
• Status: Abandoned Application

• Current Assignee: InnoLux Corporation
• Original Assignee: Innolux Display Corporation (InnoLux Corporation)
• Inventors: Lai, Chao-Chin, Hung, Chao-Yi, Chen, Hsin-Li
• Application Number:
  US12/454,873
• Publication Number:
  US 20090289912A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

A touch-sensitive liquid crystal display (LCD) device includes a first substrate, a second substrate generally opposite to the first substrate, a liquid crystal layer sandwiched between the first substrate and the second substrate, a first scan line, a data line perpendicular to the first scan line, a sensing line parallel to the data line, and a first transistor formed at an inner side of the first substrate adjacent to the liquid crystal layer, and a common electrode formed at an inner side of the second substrate adjacent to the liquid crystal layer. A gate of the first transistor is electrically connected to the first gate line. A drain of the first transistor is electrically connected to sensing line. A source of the first transistor is electrically connectable to the common electrode depending on an external pressure applied on the second substrate.

Claims

1. A touch-sensitive liquid crystal display (LCD) device, comprising:

a first substrate;

a second substrate generally opposite to the first substrate;

a liquid crystal layer sandwiched between the first substrate and the second substrate;

a first scan line, a data line perpendicular to the first scan line, a sensing line parallel to the data line, and a first transistor formed at an inner side of the first substrate adjacent to the liquid crystal layer; and

a common electrode formed at an inner side of the second substrate adjacent to the liquid crystal layer;

wherein, a gate of the first transistor is electrically connected to the first gate line, a drain of the first transistor is electrically connected to sensing line, and a source of the first transistor is electrically connectable to the common electrode depending on an external pressure applied on the second substrate.

2. The touch-sensitive LCD device of claim 1, further comprising a pixel electrode and a second transistor with a gate electrically connected to the first gate line, a source electrically connected to the data line, and a drain electrically connected to the pixel electrode.

3. The touch-sensitive LCD device of claim 1, further comprising a pixel electrode, a second scan line, and a second transistor with a gate electrically connected to the second gate line, a source electrically connected to the data line, and a drain electrically connected to the pixel electrode.

4. The touch-sensitive LCD device of claim 1, further comprising a contact electrode electrically connected to the source of the first transistor, the source of the first transistor is electrically connectable to the common electrode via the contact electrode depending on an external pressure applied on the second substrate.

5. The touch-sensitive LCD device of claim 1, further comprising a data driving circuit for providing data signals to the data line, a scan driving circuit for providing scanning signals to the first scan line, and a touch control driving circuit for obtaining touch signals from the sensing line.

6. The touch-sensitive LCD device of claim 5, wherein the common electrode is provide with a common voltage, when the first scan line is scanned and the common electrode is electrically connected to the source of the first transistor, the common voltage is transferred to the touch control driving circuit via the first transistor and the sensing line.

7. The touch-sensitive LCD device of claim 3, further comprising a spacer positioned between the common electrode and the second electrode, and a thickness of the spacer is smaller than a gap between the common electrode and the second electrode.

8. A touch-sensitive liquid crystal display (LCD) device, comprising:

a common electrode;

a first scan line;

a sensing line;

a contact electrode; and

a switch with a control terminal connected to the scan line for receiving a control signal, a first connecting terminal connected to the contact electrode, and a second connecting terminal connected to the sensing line;

wherein the common electrode is connectable to the contact electrode depending on an external pressure applied on the second substrate.

9. The touch-sensitive LCD device of claim 8, wherein the switch is a transistor, a gate of the transistor corresponding to the control terminal, a source corresponding to first connecting terminal, and a drain corresponding to the second connecting terminal.

10. The touch-sensitive LCD device of claim 9, further comprising a first substrate, a second substrate opposite to the first substrate, and a liquid crystal layer sandwiched between the first and second substrates.

11. The touch-sensitive LCD device of claim 10, further comprising a protrusion arranged corresponding to the source of the transistor, the contact electrode being arranged on the protrusion and connected to the source of the transistor.

12. The touch-sensitive LCD device of claim 10, further comprising a second transistor, a pixel electrode, and a data line parallel the sensing line at the inner side of the first substrate, the second transistor comprising a gate connected to the first scan line, a source line connected to the data line, and a drain connected to the pixel electrode.

13. The touch-sensitive LCD device of claim 10, further comprising a second transistor, a pixel electrode, a second scan line parallel to the first scan line, and a data line parallel the sensing line at the inner side of the first substrate, the second transistor comprising a gate connected to the second scan line, a source line connected to the data line, and a drain connected to the pixel electrode.

14. The touch-sensitive LCD device of claim 12, further comprising a data driving circuit for providing data signals to the data line, a scan driving circuit for providing scanning signals to the first scan line, and a touch control driving circuit for obtaining touch signals from the sensing line.

15. A method for driving a touch-sensitive liquid crystal display (LCD) device, the touch-sensitive LCD device comprising a common electrode, a first scan line, a sensing line, a contact electrode, and a switch with a control terminal connected to the scan line, a first connecting terminal connected to the contact electrode, and a second connecting terminal connected to the sensing line, the common electrode being connectable to the contact electrode depending on an external pressure applied on the second substrate, the method comprising:

scanning the first scan line to switch on the switch;

obtaining touch signals of a touch location from the sensing line;

analyzing coordinates of the touch location.

16. The method of claim 15, wherein the touch-sensitive LCD device further comprises a pixel electrode, a data line parallel the sensing line, and a transistor with a gate connected to the first scan line, a source line connected to the data line, and a drain connected to the pixel electrode, when the first scan line is scanned, the transistor is switched on, and a data signal is provide to the data line.

17. The method of claim 15, wherein the touch-sensitive LCD device further comprises a pixel electrode, a second scan line parallel to the first scan line, a data line parallel the sensing line, and a transistor with a gate connected to the second scan line, a source line connected to the data line, and a drain connected to the pixel electrode, the method further comprises:

scanning the second scan line to switch on the transistor;

providing data signals to the data line.

18. The method of claim 15, wherein the touch-sensitive LCD device further comprises a data driving circuit for providing data signals to the data line, a scan driving circuit for providing scanning signals to the first scan line, and a touch control driving circuit for obtaining touch signals from the sensing line.