TOUCH APPARATUS

• US 20140028618A1
• Filed: 07/25/2013
• Published: 01/30/2014
• Est. Priority Date: 07/25/2012
• Status: Abandoned Application

• Current Assignee: Wintek China Technology Ltd., Wintek Corporation
• Original Assignee: Wintek China Technology Ltd., Wintek Corporation
• Inventors: Chang, Ting-Yu, Hsu, Ching-Fu, Li, Chong-Wei, Li, Kuang-Wei
• Application Number:
  US13/950,308
• Publication Number:
  US 20140028618A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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 3/044 by capacitive means
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A touch apparatus including a touch panel, a sensing controller and a capacitance matching unit is provided. The touch panel has a plurality of scan ports and a plurality of sensing ports, wherein the touch panel outputs a plurality of sensing signals through the sensing ports. The sensing controller drives the touch panel through a plurality of scan lines correspondingly coupled to the scan ports, and receives the sensing signals through a plurality of sensing lines correspondingly coupled to the sensing ports. The capacitance matching unit is coupled between the touch panel and the sensing controller through the scan lines, and is used for tuning an equivalent capacitance of the touch panel.

Claims

1. A touch apparatus, comprising:

a touch panel, having a plurality of scan ports and a plurality of sensing ports, wherein the touch panel outputs a plurality of sensing signals through the sensing ports;

a sensing controller, driving the touch panel through a plurality of scan lines correspondingly coupled to the scan ports, and receiving the sensing signals through a plurality of sensing lines correspondingly coupled to the sensing ports; and

a capacitance matching unit, coupled between the touch panel and the sensing controller through the scan lines, and configured to tune an equivalent capacitance of the touch panel.

2. The touch apparatus as claimed in claim 1, wherein the sensing controller comprises:

a driving module, providing a driving signal, and sequentially outputting the driving signal to the touch panel through the scan lines; and

a sensing module, receiving the sensing signals through the sensing lines, and generating touch information of the touch panel according to the sensing signals.

3. The touch apparatus as claimed in claim 1, wherein the capacitance matching unit comprises:

a plurality of matching capacitors, each having a first terminal and a second terminal, the first terminals of the matching capacitors being coupled to the sensing controller, and the second terminal of each of the matching capacitors being correspondingly coupled to one of the scan lines, wherein capacitances of the matching capacitors are positively correlated to a size of the touch panel.

4. The touch apparatus as claimed in claim 1, wherein the capacitance matching unit comprises:

a matching capacitor, having a first terminal and a second terminal, wherein the first terminal of the matching capacitor is coupled to the sensing controller; and

a multiplexer, having an input and an output, wherein the input of the multiplexer is coupled to the second terminal of the matching capacitor, and the output of the multiplexer is coupled to each of the scan lines,

wherein a capacitance of the matching capacitor is determined by a size of the touch panel, and the multiplexer couples the matching capacitor to one of the scan lines according to a multiplexing control signal.

5. The touch apparatus as claimed in claim 4, wherein the capacitance matching unit further comprises:

a switch unit, determining whether or not to couple the matching capacitor to the sensing controller according to a size selection signal, wherein the switch unit comprises;

a first switch, having a first terminal and a second terminal, wherein the first terminal of the first switch is coupled to the sensing controller, and the second terminal of the first switch is coupled to the first terminal of the matching capacitor; and

a second switch, having a first terminal and a second terminal, wherein the first terminal of the second switch is coupled to sensing controller and the first terminal of the first switch, and the second terminal of the second switch is coupled to the multiplexer and the second terminal of the matching capacitor,

wherein when the size of the touch panel is greater than a predetermined value, the first switch is turned on according to the size selection signal, and the second switch is turned off according to the size selection signal, and when the size of the touch panel is smaller than the predetermined value, the first switch is turned off according to the size selection signal, and the second switch is turned on according to the size selection signal.

6. A touch apparatus, comprising:

a touch panel, having a plurality of scan ports and a plurality of sensing ports, wherein the touch panel outputs a plurality of sensing signals through the sensing ports; and

a sensing controller, driving the touch panel through a plurality of scan lines correspondingly coupled to the scan ports, and receiving the sensing signals through a plurality of sensing lines correspondingly coupled to the sensing ports,

wherein the sensing controller is further configured to tune an equivalent capacitance of the touch panel.

7. The touch apparatus as claimed in claim 6, wherein the sensing controller comprises:

a driving module, providing a driving signal, and sequentially outputting the driving signal to the touch panel through the scan lines; and

a sensing module, receiving the sensing signals through the sensing lines, and generating touch information of the touch panel according to the sensing signals.

8. The touch apparatus as claimed in claim 6, wherein the sensing controller comprises:

a capacitance matching unit, coupled to the touch panel through the scan lines, wherein the capacitance matching unit sequentially outputs the driving signal to the corresponding scan lines, and tunes the equivalent capacitance of the touch panel.

9. The touch apparatus as claimed in claim 8, wherein the capacitance matching unit comprises:

a matching capacitor, having a first terminal and a second terminal, wherein the first terminal of the matching capacitor receives the driving signal; and

a multiplexer, having an input and an output, wherein the input of the multiplexer is coupled to the second terminal of the matching capacitor, and the output of the multiplexer is coupled to each of the scan lines,

wherein the multiplexer couples the matching capacitor to one of the scan lines according to a multiplexing control signal, so that the driving signal is sequentially output to the touch panel through each of the scan lines coupled to the matching capacitor.

10. A touch apparatus, comprising:

a touch panel, having a plurality of driving sensing ports, wherein the touch panel outputs a plurality of sensing signals through the driving sensing ports;

a sensing controller, outputting a driving signal to drive the touch panel through a plurality of driving sensing lines coupled to the driving sensing ports, and receiving the sensing signals through the driving sensing lines; and

a capacitance matching unit, coupled between the touch panel and the sensing controller through the driving sensing lines, and configured to tune an equivalent capacitance of the touch panel.

11. The touch apparatus as claimed in claim 10, wherein the capacitance matching unit comprises:

a plurality of matching capacitors, each having a first terminal and a second terminal, the first terminals of the matching capacitors being coupled to the sensing controller, and the second terminal of each of the matching capacitors being correspondingly coupled to one of the driving scan lines, wherein capacitances of the matching capacitors are positively correlated to a size of the touch panel.