Position touch screen panel and method of arranging a resistive sensing circuit thereof

• US 20050206624A1
• Filed: 03/19/2004
• Published: 09/22/2005
• Est. Priority Date: 03/19/2004
• Status: Active Grant

• Current Assignee: Tsung-Ying Li
• Original Assignee: Tsung-Ying Li
• Inventors: Li, Tsung-Ying
• Granted Patent: US 7,196,696 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04113 Peripheral electrode pattern in resistive digitisers, i.e. electrodes at the periphery of the resistive sheet are shaped in patterns enhancing linearity of induced field
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A position touch screen panel using a unique pattern of arranging the resistive sensing circuit, in which the touch screen panel is formed by two substrates symmetrically overlapped, having four sensor lines extending along the periphery of the substrates and creating parallel connections to cover four corners, such that at least one pair of parallel connections in opposite corners (on diagonal corners) shall attain matching voltages, where the matching voltages shall be realized only if high voltage is measured from parallel connections at one corner; and low voltage is measured from parallel connections in an opposite corner; whereby voltage levels at corner points are defined relative to other corner points on one sensor line, not from comparison of two sensor lines. Using the above circuit arrangement, the touch screen panel is able to determine the touch position accurately.

Claims

1. A method of arranging the resistive sensing circuit on a position touch screen panel, comprising the steps of:

arranging the resistive sensing circuit, consisting of sensor lines (Xin), (Xout), (Yin), and (Yout), on two substrates (11, 12) in a way that allows the two substrates to be symmetrically overlapped, such that each substrate has two sensor lines in an X or a Y direction; and

making parallel connections along the path of the sensor lines, (Xin), (Xout), (Yin), and (Yout), such that at least one pair of parallel connections in opposite corners (on diagonal lines) of the touch screen panel is able to attain matching voltages;

wherein the pair of parallel connections in opposite corners (on diagonal lines) to attain matching voltages shall fulfill the conditions;

measured voltages from first corner connections of sensor lines are high, and

measured voltages from second corner connections of sensor lines are low,

whereby the first and second corner connections respectively exist in diagonal opposite corners of the touch screen panel, and

voltage levels at corner points are defined relative to other corner points on one sensor line, not from comparison of two sensor lines.

2. A position touch screen panel, comprising:

a first substrate (11) with a periphery including four corners and having two Y direction sensor lines (Yin) (Yout) that extend along the periphery to cover all four corners; and

a second substrate (12), with a periphery including four corners and being placed over the first substrate (11), having two X direction sensor lines (Xin) (Xout) that extend along the periphery of the second substrate to cover all four corners of the second substrate;

whereby, after the above two substrates (11, 12) are symmetrically overlapped, at least one pair of parallel connections in opposite corners (on diagonal lines) of the touch screen panel shall attain matching voltages;

wherein the pair of parallel connections in opposite corners (on diagonal lines) shall attain matching voltages by fulfilling the conditions;

measured voltages from first corner connections of sensor lines are high, and

measured voltages from second corner connections of sensor lines are low,

whereby the first and second corner connections respectively exist in opposite corners of the touch screen panel and

voltage levels at corner points are defined relative to other corner points on one sensor line, not from comparison of two sensor lines.

3. The position touch screen panel according to claim 2, wherein the touch screen panel has four corners A, B, C and D sequentially arranged in a counter-clockwise direction, and the pairs of corners A and C, and corners B and D are arranged in opposite corners (on diagonal lines) of the touch screen panel, and the sensor lines (Xin), (Xout), (Yin), and (Yout) have multiple parallel connections along the path to cover the four corners of the touch screen panel, whereby:

the sensor line (Yin) of the first substrate (11) starts from one end in the middle section of the lower side of the first substrate (11), connects to corner A, and then returns to corner D, such that the voltage over corner A connection of the sensor line (Yin) is higher than that over corner D connection of the sensor line (Yin);

the sensor line (Yout) of the first substrate starts from one end in the middle section of the lower side of the first substrate (11), connects to corner D, corner C, and then turns to corner B, such that the voltage over corner B connection of the sensor line (Yout) shall be higher than that over corner C connection of the sensor line (Yout);

sensor line (Xin) of the second substrate (12) starts off from one end in the middle section of the lower side of the second substrate (12), connects to corner A, and corner B serially, such that the voltage over corner A connection of the sensor line (Xin) shall be higher than that over corner B connection of the sensor line (Xin); and

sensor line (Xout) of the second substrate (12) starts off from one end in the middle section of the lower side of the second substrate (12), connects to corner D, to corner C, and then returns to corner D, such that the voltage over corner D connection of the sensor line (Xout) shall be higher than that over corner C connection of the sensor line (Xout);

whereby the pair of parallel connections in opposite corners A and C shall fulfill the conditions of matching voltages.

4. A position touch screen panel, comprising:

a first substrate (11) with a periphery including four corners and having four sensor lines (Xin) (Xout) (Yin) (Yout) in X, Y directions on an inner surface that extends along the periphery of the substrate to cover all the four corners; and

a second substrate (12) with a periphery being placed over the first substrate (11) and having a common sensing line (13) on an inner surface that extends along the periphery of the substrate (12) to form a closed loop;

whereby, after the above two substrates (11, 12) are symmetrically overlapped, at least one pair of parallel connections in opposite corners (on diagonal lines) of the first substrate (11) shall attain matching voltages;

wherein the pair of parallel connections in opposite corners (on diagonal lines) shall attain matching voltages by fulfilling the conditions;

measured voltages from first corner connections of sensor lines are high, and

measured voltages from second corner connections of sensor lines are low,

whereby the first and second corner connections respectively exist in opposite corners of the touch screen panel and

voltage levels at corner points are defined relative to other corner points on one sensor line, not from comparison of two sensor lines . . .

5. The position touch screen panel according to claim 4, wherein the touch screen panel has four corners A, B, C, D sequentially arranged in a counter-clockwise direction, and the pairs of corners A and C, and Band D, are opposite corners of the touch screen panel, and the four sensor lines (Xin), (Xout), (Yin), and (Yout) in the X, Y directions on the first substrate have multiple parallel connections along the path to cover the four corners of the touch screen panel, whereby:

the sensor line (Yin) of the first substrate (11) starts from one end in the middle section of the lower side of the first substrate, connects to corner A, and then returns to corner D, such that the voltage over corner A connection of the sensor line (Yin) shall be higher than that over corner D connection of the sensor line (Yin);

the sensor line (Yout) on the first substrate (11) starts off from one end in the middle section of the lower side, connects to corner D, corner C, and then turns to corner B, such that the voltage over the corner B connection of the sensor line (Yout) shall be higher than that from the corner C connection of the sensor line (Yout);

the sensor line (Xin) on the first substrate (11) starts from one end in the middle section of the lower side, connects to corner A and corner B serially, such that the voltage over the corner A connection of the sensor line (Xin) shall be higher than that from the corner B connection of the sensor line (Xin); and

the sensor line (Xout) on the first substrate (11) starts from one end in the middle section of the lower side, connects to corner D and corner C and then returns to corner D, such that the voltage over the corner D connection of the sensor line (Xout) shall be higher than that from the corner C connection of the sensor line (Xout);

whereby parallel connections in opposite corners A and C shall fulfill the conditions of matching voltages.