METHOD FOR DETECTING TOUCH POINT AND TOUCH PANEL USING THE SAME

• US 20100117982A1
• Filed: 02/25/2009
• Published: 05/13/2010
• Est. Priority Date: 11/13/2008
• Status: Active Grant

• Current Assignee: Orise Technology Co., Ltd (FocalTech Systems Co.,Ltd)
• Original Assignee: Orise Technology Co., Ltd (FocalTech Systems Co.,Ltd)
• Inventors: Liu, Cheng-Chin, CHENG, Wei Chung
• Granted Patent: US 8,159,473 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04808 Several contacts: gestures triggering a specific function, e.g. scrolling, zooming, right-click, when the user establishes several contacts with the surface simultaneously; e.g. using several fingers or a combination of fingers and pen
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

The present invention relates to a method for detecting touch points and a touch panel using the same. The method includes the steps of: providing a resistive pressure-sensing matrix includes M X-axis sensing lines and N Y-axis sensing lines, wherein the i^th X-axis sensing line and the j^th Y-axis sensing line are short-circuited when a preset range covering an overlapped region between the i^th X-axis sensing line and the j^th Y-axis sensing line is pressed; applying a scanning voltage to the p^th Y-axis sensing line in a p^th scanning period; detecting the M X-axis sensing lines to judge whether the scanning voltage is detected; and determining a touch coordinate as (q, p) when the q^th X-axis sensing line receives the scanning voltage in the p^th scanning period, wherein M, N, i, p and q are positive integers, 0<i, q<=M and 0<p<=N.

Claims

1. A touch panel, comprising:

a resistive pressure-sensing matrix, which comprises M X-axis sensing lines and N Y-axis sensing lines, wherein the i^th X-axis sensing line and the j^th Y-axis sensing line are short-circuited when a preset range covering an overlapped region between the i^th X-axis sensing line and the j^th Y-axis sensing line of the resistive pressure-sensing matrix is pressed;

a sequence scan driver having N driving terminals respectively coupled to the N Y-axis sensing lines; and

M X-axis sensing circuits, wherein;

the k^th X-axis sensing circuit is coupled to the k^th X-axis sensing line;

a sensing period of the touch panel is divided into N scanning periods, and the p^th driving terminal of the sequence scan driver outputs a scanning voltage in the p^th scanning period;

the q^th X-axis sensing circuit receives the scanning voltage so that a touch coordinate is determined as (q, p) when the preset range covering the overlapped region between the p^th Y-axis sensing line and the q^th X-axis sensing line is pressed in the p^th scanning period; and

M, N, i, j, k, p and q are positive integers, i ranges between 1 and M, j ranges between 1 and N, k ranges between 1 and M, q ranges between 1 and M, and p ranges between 1 and N.

2. The touch panel according to claim 1, wherein each of the X-axis sensing circuits comprises a comparator, the comparator of the k^th X-axis sensing circuit has a first input terminal, a second input terminal and an output terminal, the first input terminal is coupled to a reference voltage, the second input terminal is coupled to the k^th X-axis sensing line, and the comparator compares a voltage of the k^th X-axis sensing line with the reference voltage, and judges whether the scanning voltage is received according to a compared result.

3. The touch panel according to claim 1, wherein the sequence scan driver sequentially outputs the scanning voltages from the N driving terminals.

4. A method for detecting a plurality of touch points, the method comprising the steps of:

providing a resistive pressure-sensing matrix, which comprises M X-axis sensing lines and N Y-axis sensing lines, wherein the i^th X-axis sensing line and the j^th Y-axis sensing line are short-circuited when a preset range covering an overlapped region between the i^th X-axis sensing line and the j^th Y-axis sensing line of the resistive pressure-sensing matrix is pressed;

applying a scanning voltage to the p^th Y-axis sensing line in a p^th scanning period;

detecting the M X-axis sensing lines to judge whether the scanning voltage is detected; and

determining a touch coordinate as (q, p) when the q^th X-axis sensing line receives the scanning voltage in the p^th scanning period,

wherein M, N, i, j, p and q are positive integers, i ranges between 1 and M, j ranges between 1 and N, q ranges between 1 and M, and p ranges between 1 and N.

5. The method according to claim 4, wherein the step of detecting the M X-axis sensing lines to judge whether the scanning voltage is detected comprises:

providing a reference voltage; and

comparing voltages of the X-axis sensing lines with the reference voltage.