Touch substrate and electro-wetting display device having touch control function

• US 20090065781A1
• Filed: 09/05/2008
• Published: 03/12/2009
• Est. Priority Date: 09/07/2007
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Innolux Display Corporation (InnoLux Corporation)
• Inventors: Chen, Wen-Hua
• Granted Patent: US 7,872,693 B2
• Time in Patent Office: Days
• US Class Current: 257/71
• CPC Class Codes: G02B 26/005 based on electrowetting
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• 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
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/13 combined with thin-film or thick-film passive components

Abstract

A touch substrate includes a transparent substrate having a first surface and a second surface facing the first surface, a plurality of thin film transistor elements disposed on the second surface, and a capacitance touch structure. The capacitance touch structure includes a plurality of parallel first conductive electrodes disposed on the first surface and a plurality of parallel second conductive electrodes disposed on the second surface. The second electrodes cross the first electrodes insulatingly. The first electrodes, the second electrodes and the transparent substrate sandwiched therebetween form a plurality of sensing capacitors.

Claims

1. A touch substrate comprising:

a transparent substrate comprising a first surface and a second surface facing the first surface;

a plurality of thin film transistor elements disposed on the second surface; and

a capacitance touch structure comprising;

a plurality of parallel first conductive electrodes disposed on the first surface; and

a plurality of parallel second conductive electrodes disposed on the second surface, the second electrodes crossing the first electrodes insulatingly, wherein the first electrodes, the second electrodes and the transparent substrate sandwiched therebetween forming a plurality of sensing capacitors.

2. The touch substrate of claim 1, further comprising a plurality of parallel scanning lines and a plurality of parallel data lines disposed on the second surface, the data lines perpendicularly crossing the scanning lines insulatingly, the thin film transistor elements being disposed adjacent to intersections of the scanning lines and the data lines.

3. The touch substrate of claim 2, further comprising a plurality of common lines disposed on the second surface, the common lines and the scanning lines being arranged alternately.

4. The touch substrate of claim 3, wherein the second electrodes are part of the common lines.

5. The touch substrate of claim 2, wherein the first conductive electrodes are disposed corresponding to the data lines.

6. The touch substrate of claim 1, further comprising a plurality of diodes placed on the second conductive electrodes.

7. The touch substrate of claim 6, wherein the diode comprises a first semi-conductor layer and a metal electrode, the metal electrode defining an opening, separated parts of the metal electrode adjacent the opening being electrically connected with each other by the first semi-conductor layer.

8. The touch substrate of claim 7, further comprising a first insulating layer sandwiched between the metal electrode and the second conductive electrode.

9. The touch substrate of claim 8, wherein the first insulating layer defines a connecting hole for connecting the metal electrode and the second conductive electrode.

10. The touch substrate of claim 9, wherein the thin film transistor comprises a gate electrode, a source electrode, a drain electrode and a second semi-conductor layer, the gate electrode being disposed on the second surface, the first insulating layer covering the gate electrode, the second semi-conductor layer being disposed on the first insulating layer corresponding to the gate electrode, the source electrode and the drain electrode overlapping a part of the second semi-conductor layer.

11. The touch substrate of claim 10, further comprising a pixel electrode disposed on a separated part of the metal electrode far from the connecting hole, the pixel electrode being connected with the drain electrode.

12. The touch substrate of claim 11, further comprising a second insulating layer sandwiched between the pixel electrode and the metal electrode.

13. The touch substrate of claim 12, wherein the metal electrode, the pixel electrode, and the second insulating layer form a storage capacitor.

14. A touch electro-wetting display device, comprising:

a touch substrate;

a holding substrate facing the touch substrate;

a hydrophobic insulating layer covering the touch substrate;

a first polar liquid disposed between the holding substrate and the hydrophobic insulating layer;

a second polar liquid disposed between the holding substrate and the first polar liquid, the first second polar liquid and the second polar liquid being immiscible,

wherein the touch substrate comprising;

a transparent substrate comprising a first surface and a second surface facing the first surface;

a plurality of thin film transistor elements disposed on the second surface; and

a capacitance touch structure comprising;

a plurality of parallel first conductive electrodes disposed on the first surface; and

a plurality of parallel second conductive electrodes disposed on the second surface, the second electrodes crossing the first electrodes insulatingly, the first electrodes, the second electrodes and the transparent substrate sandwiched therebetween forming a plurality of sensing capacitors.

15. A touch substrate comprising:

a transparent substrate comprising a first surface and a second surface facing the first surface; and

a plurality of parallel first conductive electrode disposed on the first surface,

the touch substrate defining a plurality of pixel regions, each pixel region comprising;

a common line disposed on the second surface;

at least one first insulating layer; and

a storage capacitor, the common line perpendicularly intersecting with the first conductive line and being placed through the pixel region, the at least one first insulating layer covering the common line,

the storage capacitor comprising;

a first metal electrode disposed on the at least one first insulating layer corresponding to the common line;

at least one second insulating layer covering the first metal electrode; and

a pixel electrode covering the at least one second insulating layer, wherein the common line, the at least one conductive electrode, and the transparent substrate cooperatively forming a sensing capacitor.

16. The touch substrate of claim 15, further comprising a diode disposed corresponding to the common line.

17. The touch substrate of claim 16, wherein the diode comprises a semi-conductor layer and a metal electrode disposed on the common line, the metal electrode defining an opening, separated parts of the metal electrode adjacent the opening being electrically connected with each other via the semi-conductor layer.

18. The touch substrate of claim 17, further comprising a second insulating layer sandwiched between the metal electrode and the common line.

19. The touch substrate of claim 18, wherein the first insulating layer defines a connecting hole for connecting the metal electrode and the common line.

20. The touch substrate of claim 15, wherein the first liquid is non-conductive, and the second liquid is conductive.