Device for scanning and detecting touch point of touch control panel and method thereof

• US 20090146966A1
• Filed: 07/11/2008
• Published: 06/11/2009
• Est. Priority Date: 12/11/2007
• Status: Abandoned Application

• Current Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Original Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Inventors: Liu, Chen-Yu
• Application Number:
  US12/216,863
• Publication Number:
  US 20090146966A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

A device for scanning and detecting a touch point of a touch control panel is disclosed, wherein a driving/scanning circuit carries out one-end-sequential-driving or both-end-sequential-driving for driving each elongate conductive strip of a first conductive layer of the touch control panel, and a scan sensing circuit carries out one-end-sequential-scanning, both-end-sequential-scanning or sequential both-end-simultaneous-scanning operation over each elongate conductive strips of a second conductive layer of the touch control panel. Based on the result of the scanning operation that the scan sensing circuit performs over the elongate conductive strips of the second conductive layer, at least one touch location can be detected on each elongate conductive strip of the second conductive layer with respect to each elongate conductive strip of the first conductive layer.

Claims

1. A touch control panel, comprising:

a first substrate forming a first conductive layer which comprises a plurality of elongate conductive strips that are substantially parallel to but do not engage each other, the elongate conductive strips extending in a first direction and having opposite first and second ends;

a second substrate forming a second conductive layer, which comprises a plurality of elongate conductive strips that are substantially parallel to but do not engage each other, the elongate conductive strips extending in a second direction and having opposite first and second ends, the first substrate and the second substrate being spaced from each other by insulation spacers;

a driving/scanning circuit connected to the elongate conductive strips of the first conductive layer via driving/scanning lines respectively;

a scan sensing circuit connected to the elongate conductive strips of the second conductive layers via scanning lines respectively; and

a micro-controller connected to the driving/scanning circuit and the scan sensing circuit;

wherein the driving/scanning circuit sequentially drives the elongate conductive strips of the first conductive layer and at the time when the driving/scanning circuit sequentially drives one of the elongate conductive strips of the first conductive layer, the scan sensing circuit sequentially scans/detects the elongate conductive strips of the second conductive layer to detect a touch location occurring on the touch control panel.

2. The touch control panel as claimed in claim 1, wherein the first ends of the elongate conductive strips of the first conductive layers are connected to the driving/scanning circuit by the driving/scanning lines and the second ends of the elongate conductive strips of the first conductive layers are open, and wherein the first ends of the elongate conductive strips of the second conductive layers are connected to the scanning/detection circuit by the scanning lines and the second ends of the elongate conductive strips of the second conductive layers are open.

3. The touch control panel as claimed in claim 1, wherein the first ends of the elongate conductive strips of the first conductive layers are connected to the driving/scanning circuit by the driving/scanning lines and the second ends of the elongate conductive strips of the first conductive layers are open, and wherein the first and second ends of the elongate conductive strips of the second conductive layers are connected to the scan sensing circuit by the scanning lines.

4. The touch control panel as claimed in claim 1, wherein the first and second ends of the elongate conductive strips of the first conductive layers are connected to the driving/scanning circuit by the driving/scanning lines, and wherein the first ends of the elongate conductive strips of the second conductive layers are connected to the scan sensing circuit by the scanning lines and the second ends of the elongate conductive strips of the second conductive layers are open.

5. The touch control panel as claimed in claim 1, wherein the first and second ends of the elongate conductive strips of the first conductive layers are connected to the driving/scanning circuit by the driving/scanning lines, and wherein the first and second ends of the elongate conductive strips of the second conductive layers are connected to the scan sensing circuit by the scanning lines.

6. A method for scanning/detecting a touch location in a touch control panel that comprises a first substrate forming a first conductive layer that comprises a plurality of elongate conductive strips that are parallel to but do not engage each other and extend in a first direction to form opposite first and second ends, and a second substrate forming a second conductive layer that comprises a plurality of elongate conductive strips that is parallel to but do not engage each other and extend in a second direction to form opposite first and second ends, the first and second substrates being spaced from each other by insulation spacers, the method comprising the following steps;

(a) employing a driving/scanning circuit to drive one of the elongate conductive strips of the first conductive layer;

(b) employing a scan sensing circuit to sequentially scan each elongate conductive strip of the second conductive layer;

(c) detecting at least one touch location on each elongate conductive strips of the second conductive layer with respect to the one of the elongate conductive strips of the first conductive layer in accordance with result of scanning that the scan sensing circuit performs over the elongate conductive strips of the second conductive layer;

(d) employing the driving/scanning circuit to sequentially drive a next one of the elongate conductive strips of the first conductive layer;

(e) detecting at least one touch location on each elongate conductive strips of the second conductive layer with respect to each designated one of the elongate conductive strips of the first conductive layer in accordance with result of scanning that the scan sensing circuit performs over the elongate conductive strips of the second conductive layer; and

(f) repeating steps (a) to (e).

7. The method as claimed in claim 6, wherein the driving/scanning circuit sequentially drives the first end of each elongate conductive strip of the first conductive layer and the scan sensing circuit carries out sequential scanning over the first end of each elongate conductive strip of the second conductive layer.

8. The method as claimed in claim 6, wherein the driving/scanning circuit sequentially drives the first end of each elongate conductive strip of the first conductive layer and the scan sensing circuit carries out sequential scanning over the first end and the second end of each elongate conductive strip of the second conductive layer.

9. The method as claimed in claim 6, wherein the driving/scanning circuit sequentially drives the first end of each elongate conductive strip of the first conductive layer and the scan sensing circuit carries out sequential scanning/detection over the elongate conductive strips of the second conductive layer by simultaneously scanning the first and second ends of each elongate conductive strip of the second conductive layer.

10. The method as claimed in claim 6, wherein the driving/scanning circuit sequentially drives the elongate conductive strips of the first conductive layer by simultaneously driving both the first and second ends of each elongate conductive strip of the first conductive layer and the scan sensing circuit carries out sequential scanning over the elongate conductive strips of the second conductive layer by simultaneously scanning the first and second ends of each elongate conductive strip of the second conductive layer.