PRESSURE SENSING MODULE AND PRESSURE SENSING TOUCH CONTROL SYSTEM USING THE SAME

• US 20180074638A1
• Filed: 09/14/2017
• Published: 03/15/2018
• Est. Priority Date: 09/14/2016
• Status: Active Grant

• Current Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Original Assignee: TPK Touch Solutions (Xiamen) Inc. (TPK Holding Co., Ltd.)
• Inventors: Chiang, Cheng-Chung, Chen, Feng, Chi, Ho-Hsun, Chuang, Chih-Cheng, Lin, Sun-Po, Wei, Wei
• Granted Patent: US 10,452,187 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A pressure sensing module and a pressure sensing touch control system are provided. The pressure sensing module includes a sensing layer formed on a surface of a substrate. The sensing layer includes at least one pressure sensing unit including four resistors with the same resistance values. The four resistors form a Wheatstone bridge. Pattern shapes of two of the four resistors have the same extending directions, and the two of the four resistors are not disposed adjacent to each other. The pressure sensing touch control system includes a touch control sensing unit. The touch control sensing unit is disposed between the four resistors to achieve pressure sensing and position sensing of pressing action. In the present disclosure, a bridge circuit is disposed on a single surface to prevent the sensing for pressing with a finger from being affected by temperature and other noise.

Claims

1. A pressure sensing module, comprising:

a substrate; and

a sensing layer formed on a surface of the substrate, the sensing layer comprising at least one pressure sensing unit, the pressure sensing unit comprising four resistors of substantially the same electrical resistance, the four resistors forming a Wheatstone bridge, wherein pattern shapes of two of the four resistors have the same extending directions and are not disposed adjacent to each other.

2. The pressure sensing module of claim 1, wherein the two resistors with the pattern shapes having the same extending directions are disposed diagonally.

3. The pressure sensing module of claim 1, wherein two of the four resistors with the pattern shapes having the same extending directions are defined as a first resistor group, the other two of the four resistors are defined as a second resistor group, and an extending direction of the first resistor group is different from an extending direction of the second resistor group.

4. The pressure sensing module of claim 3, wherein the extending direction of a pattern shape of the first resistor group is substantially perpendicular to the extending direction of a pattern shape of the second resistor group.

5. The pressure sensing module of claim 4, wherein a total projection length of a pattern shape of one of the resistors along a first direction is greater than a total projection length of the pattern shape of the one of the resistors along a second direction.

6. The pressure sensing module of claim 3, wherein the first resistor group comprises a first resistor and a second resistor, the second resistor group comprises a third resistor and a fourth resistor, the first resistor comprises a first node and a second node, the second resistor comprises a third node and a fourth node, the third resistor comprises a fifth node and a sixth node, the fourth resistor comprises a seventh node and an eighth node, and the pressure sensing module further comprises a joint region.

7. The pressure sensing module of claim 6, wherein the first node and the fifth node are electrically connected within the joint region to form a first input port within the joint region, the second node and the third node are electrically connected within the joint region to form a first output port within the joint region, the fourth node and the eighth node are electrically connected within the joint region to form a second input port within the joint region, and the sixth node and the seventh node are electrically connected within the joint region to form a second output port within the joint region.

8. The pressure sensing module of claim 6, wherein the first node and the fifth node form a first input port through pattern shape electric connection, the second node and the third node form a first output port through pattern shape electric connection, the fourth node and the eighth node form a second input port through pattern shape electric connection, the sixth node and the seventh node form a second output port through pattern shape electric connection, and the first output port, the second output port, the first input port and the second input port are independently wired to the joint region.

9. The pressure sensing module of claim 6, wherein the first node and the fifth node are independently wired to the joint region, and are electrically connected within the joint region to form a first input port, the second node and the third node form a first output port through pattern shape electric connection, the fourth node and the eighth node are independently wired to the joint region, and are connected within the joint region to form the second input port, and the sixth node and the seventh node form a second output port through pattern shape form the second input port, and the first output port and the second output port are independently wired to the joint region and connected within the joint region.

10. The pressure sensing module of claim 1, wherein a width of the sensing layer is not equal to a length of the sensing layer.

11. The pressure sensing module of claim 1, wherein time-division scanning is performed on the pressure sensing unit, so as to enable the pressure sensing unit to perform pressure sensing on pressing of a finger for the pressure sensing module in a first time interval, and to perform positon sensing on the pressing of the finger for the pressure sensing module in the second time interval.

12. A pressure sensing touch control system, comprising:

a substrate; and

a sensing layer formed on a surface of the substrate, the sensing layer comprising at least one pressure sensing unit and at least one touch control sensing unit, the pressure sensing unit comprising four resistors of substantially the same electrical resistance, the four resistors forming a Wheatstone bridge, wherein pattern shapes of two of the four resistors have the same extending directions and are not disposed adjacent to each other, and the touch control sensing unit is disposed between the four resistors.

13. The pressure sensing touch control system of claim 12, a pattern shape of the touch control sensing unit and the pattern shapes of the four resistors are complementary.

14. The pressure sensing touch control system of claim 12, wherein the two resistors with the pattern shapes having the same extending directions are disposed diagonally.

15. The pressure sensing touch control system of claim 12, wherein two resistors with the pattern shapes having the same extending direction are defined as a first resistor group, the other two resistors are defined as a second resistor group, and an extending direction of the first resistor group is perpendicular to an extending direction of the second resistor group.

16. The pressure sensing touch control system of claim 15, wherein the first resistor group comprises a first resistor and a second resistor, the second resistor group comprises a third resistor and a fourth resistor, the first resistor comprises a first node and a second node, the second resistor comprises a third node and a fourth node, the third resistor comprises a fifth node and a sixth node, the fourth resistor comprises a seventh node and an eighth node, and the pressure sensing module further comprises a joint region.

17. The pressure sensing touch control system of claim 16, wherein the first node and the fifth node are electrically connected within the joint region to form a first input port within the joint region, the second node and the third node are electrically connected within the joint region to form a first output port within the joint region, the fourth node and the eighth node are electrically connected within the joint region to form a second input port within the joint region, and the sixth node and the seventh node are electrically connected within the joint region to form a second output port within the joint region.

18. The pressure sensing touch control system of claim 16, wherein the first node and the fifth node are independently wired to the joint region, and are electrically connected within the joint region to form a first input port, the second node and the third node form a first output port through pattern shape electric connection, the fourth node and the eighth node are independently wired to the joint region, and are connected within the joint region to form the second input port, and the sixth node and the seventh node form a second output port through pattern shape form the second input port, and the first output port and the second output port are independently wired to the joint region and connected within the joint region.

19. The pressure sensing touch control system of claim 12, wherein a width of the sensing layer is not equal to a length of the sensing layer.

20. The pressure sensing touch control system of claim 12, wherein time-division scanning is performed on the pressure sensing unit, so as to enable the pressure sensing unit to perform a pressure sensing on pressing of a finger for the pressure sensing module in a first time interval, and to perform a positon sensing on the pressing of the finger for the pressure sensing module in the second time period.