Coordinate algorithm of touch panel

• US 9,069,409 B2
• Filed: 12/10/2010
• Issued: 06/30/2015
• Est. Priority Date: 10/26/2010
• Status: Active Grant

• Current Assignee: Novatek Microelectronics Corporation (Novatek Microelectronics Corp Limited)
• Original Assignee: Novatek Microelectronics Corporation (Novatek Microelectronics Corp Limited)
• Inventors: Chang, Hui-Hung
• Primary Examiner(s): JOSEPH, DENNIS P
• Application Number:
  US12/964,744
• Publication Number:
  US 20120098759A1
• Time in Patent Office: 1,663 Days
• Field of Search: 345173-178
• US Class Current: 1/1
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• 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 coordinate algorithm of a touch panel is provided, in which the touch panel includes a plurality of first-direction sensing lines and a plurality of second-direction sensing lines. The coordinate algorithm of a touch panel includes following steps. A first edge coordinate is obtained. A first coordinate compensation parameter is defined. The first edge coordinate is taken as a first base coordinate, and the first base coordinate is adjusted according to the first coordinate compensation parameter to obtain a first interpolation coordinate when an edge of the touch panel is touched.

Claims

1. A coordinate algorithm of a touch panel, wherein the touch panel comprises a plurality of first-direction sensing lines and a plurality of second-direction sensing lines, the coordinate algorithm comprising:

obtaining a first edge coordinate and a second edge coordinate;

defining a first coordinate compensation parameter and a second coordinate compensation parameter; and

wherein the step of defining the first coordinate compensation parameter comprises defining the first coordinate compensation parameter according to the number of the first-direction sensing lines;

wherein the step of defining the second coordinate compensation parameter comprises defining the second coordinate compensation parameter according to the number of the second-direction sensing lines;

taking the first edge coordinate as a first base coordinate, and adjusting the first base coordinate according to the first coordinate compensation parameter to obtain a first interpolation coordinate when a first edge of the touch panel is touched; and

taking the second edge coordinate as a second base coordinate, and adjusting the second base coordinate according to the second coordinate compensator parameter to obtain a second interpolation coordinate when the first edge or a second edge of the touch panel is touched,

wherein the touch panel further comprises a first dummy line and a second dummy line, the first dummy line and the second dummy line are physical sensing lines and arranged on an edge region of the touch panel, the first dummy line and the second dummy line respectively comprise a first part and a second part, and the coordinate algorithm further comprises;

scaling the first interpolation coordinate according to an area difference between the touched first-direction sensing line and the first part of the first dummy line or the first part of the second dummy line; and

scaling the second interpolation coordinate according to an area difference between the touched second-direction sensing line and the second part of the first dummy line or the second part of the second dummy line.

2. The coordinate algorithm of a touch panel according to claim 1, wherein M stages of first-direction coordinates are differentiated between two of the neighboring first-direction sensing lines, and M is a positive integer.

3. The coordinate algorithm of a touch panel according to claim 2, wherein the step of defining the first coordinate compensation parameter comprises:

defining the first coordinate compensation parameter according to the M value.

4. The coordinate algorithm of a touch panel according to claim 1, wherein N stages of second-direction coordinates are differentiated between two of the neighboring second-direction sensing lines, and N is a positive integer.

5. The coordinate algorithm of a touch panel according to claim 4, wherein the step of defining the second coordinate compensation parameter comprises:

defining the second coordinate compensation parameter according to the N value.

6. The coordinate algorithm of a touch panel according to claim 1, wherein an arrangement direction of the first-direction sensing lines is substantially perpendicular to an arrangement direction of the second-direction sensing lines.