IP Library › Granted Patent US 9,436,317
Granted Patent B2
US 9,436,317 · App. 14/281,078 · Granted Sep 6, 2016

Touch sensor and touch sensitive display including the same

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Quick Facts
Patent No.
US 9,436,317
App. No.
14/281,078
Granted
Sep 6, 2016
Kind
B2
Abstract

A touch sensor includes a touch panel, a driver for supplying a driving signal to each of driving lines of the touch panel, and a sensor electrically connected to sensing lines of the touch panel, for detecting capacitance of a node capacitor of the touch panel, wherein the sensor includes a first amplifier including a first input terminal, a second input terminal, and an output terminal, the first input terminal being connected to the corresponding sensing line, a feedback capacitor connected between the output terminal and the first input terminal of the first amplifier, and an inverting amplifier for invert-amplifying an output signal of the output terminal of the first amplifier and supplying the invert-amplified output signal to the second input terminal of the first amplifier.

Claims (60)

1. A touch sensor comprising:

a touch panel comprising driving lines, sensing lines, and a node capacitor formed between a driving line and a sensing line adjacent to each other;

a driver for supplying a driving signal to each of the driving lines; and a sensor electrically connected to the sensing lines, for detecting capacitance of a node capacitor between a driving line with the driving signal supplied thereto and a sensing line corresponding to the driving line,

wherein the sensor comprises:

a first amplifier comprising a first input terminal, a second input terminal, and an output terminal, the first input terminal being connected to the corresponding sensing line;

a feedback capacitor connected between the output terminal and the first input terminal of the first amplifier; and

an inverting amplifier for invert-amplifying an output signal of the output terminal of the first amplifier and supplying the invert-amplified output signal to the second input terminal of the first amplifier,

wherein the inverting amplifier includes:

a second amplifier including a first input terminal, a second input terminal, and an output terminal directly connected to the second input terminal of the first amplifier:

a first resistor connected between the output terminal of the first amplifier and the first input terminal of the second amplifier: and

a second resistor connected between the first input terminal of the second amplifier and the output terminal of the second amplifier.

2. The touch sensor according to claim 1 , wherein an amplification ratio of the inverting amplifier is a ratio of a resistance of the first resistor and a resistance of the second resistor.

3. The touch sensor according to claim 2 , wherein the second input terminal of the second amplifier is electrically connected to a ground source.

4. The touch sensor according to claim 2 , wherein the first resistor and the second resistor have the same resistance.

5. The touch sensor according to claim 2 , wherein the second amplifier is an operating amplifier.

6. The touch sensor according to claim 1 , further comprising a feedback resistor connected between the output terminal and the first input terminal of the first amplifier and connected in parallel to the feedback capacitor.

7. The touch sensor according to claim 1 , wherein the first amplifier is an operating amplifier.

8. The touch sensor according to claim 1 , wherein each of the first input terminals of the first and second amplifiers is an inverting terminal and each of the second input terminals of the first and second amplifiers is a non-inverting terminal.

9. The touch sensor according to claim 1 , wherein one end of the second resistor is connected to a first node connecting the output terminal of the first amplifier and the first input terminal of the second amplifier, and the other end of the second resistor is connected to a second node connecting the output terminal of the second amplifier and the second input terminal of the first amplifier.

10. A touch sensor comprising:

a touch panel comprising driving lines, sensing lines, and a node capacitor formed between a driving line and a sensing line adjacent to each other;

a driver for supplying a driving signal to each of the driving lines; and

a sensor electrically connected to the sensing lines, for detecting capacitance of the node capacitor,

wherein the sensor comprises sensing circuits, each of which senses a signal received from corresponding one of the sensing lines,

wherein each of the sensing circuits comprises:

a first amplifier comprising a first input terminal connected to the sensing line, a second input terminal, and an output terminal, the first input terminal being connected to the corresponding sensing line;

a feedback capacitor connected between the output terminal and the first input terminal of the first amplifier;

a feedback resistor connected between the output terminal and the first input terminal of the first amplifier and connected in parallel to the feedback capacitor; and

an inverting amplifier for invert-amplifying an output signal of the output terminal of the first amplifier and supplying the invert-amplified output signal to the second input terminal of the first amplifier,

wherein the inverting amplifier includes:

a second amplifier including a first input terminal, a second input terminal connected to a ground source, and an output terminal directly connected to the second input terminal of the first amplifier;

a first resistor connected between the output terminal of the first amplifier and the first input terminal of the second amplifier; and

a second resistor connected between the first input terminal of the second amplifier and the output terminal of the second amplifier.

11. The touch sensor according to claim 10 , wherein:

the sensor further comprises analog-digital converters; and

each of the analog-digital converters converts output of corresponding one of the sensing circuits into a digital signal.

12. The touch sensor according to claim 10 , wherein an amplification ratio of the inverting amplifier is a ration of a resistance of the first resistor and a resistance of the second resistor.

13. The touch sensor according to claim 12 , wherein the first amplifier and the second amplifier are each an operating amplifier.

14. A touch sensitive display comprising:

a display coupled to a touch panel;

the touch panel, comprising driving lines, sensing lines, and a node capacitor formed between a driving line and a sensing line adjacent to each other;

a driver for supplying a driving signal to each of the driving lines; and a sensor electrically connected to the sensing lines, for detecting capacitance of a node capacitor between a driving line with the driving signal supplied thereto and a sensing line corresponding to the driving line,

a sensor electrically connected to the sensing lines, for detecting capacitance of the node capacitor between a driving line with the driving signal supplied thereto and a sensing line corresponding to the driving line,

wherein the sensor comprises:

a first amplifier comprising a first input terminal connected to the sensing line, a second input terminal, and an output terminal, the first input terminal being connected to the corresponding sensing line;

a feedback capacitor connected between the output terminal and the first input terminal of the first amplifier; and

an inverting amplifier for invert-amplifying an output signal of the output terminal of the first amplifier and supplying the invert-amplified output signal to the second input terminal of the first amplifier,

wherein the inverting amplifier comprises:

a second amplifier including a first input terminal, a second input terminal, and an output terminal directly connected to the second input terminal of the first amplifier;

a first resistor connected between the output terminal of the first amplifier and the first input terminal of the second amplifier; and

a second resistor connected between the first input terminal of the second amplifier and the output terminal of the second amplifier.

15. The touch sensitive display according to claim 14 , wherein the inverting amplifier comprises:

a second amplifier comprising a first input terminal, a second input terminal, and an output terminal;

a first resistor connected between the output terminal of the first amplifier and the first input terminal of the second amplifier; and

a second resistor connected between the first input terminal of the second amplifier and the output terminal of the second amplifier.

16. The touch sensitive display according to claim 15 , wherein the first resistor and the second resistor have the same resistance.

17. The touch sensitive display according to claim 15 , wherein the second amplifier is an operating amplifier.

18. The touch sensitive display according to claim 14 , further comprising a feedback resistor connected between the output terminal and the first input terminal of the first amplifier and connected in parallel to the feedback capacitor.

19. The touch sensitive display according to claim 14 , wherein the first amplifier is an operating amplifier.

20. The touch sensitive display according to claim 14 , wherein the second input terminal is electrically connected to a ground source.

Assignments (2)
CHANGE OF NAME Recorded Nov 30, 2017
From: DONGBU HITEK CO., LTD.
To: DB HITEK CO., LTD.
Reel/Frame 044559/0819 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 19, 2014
From: HEO, WOONHYUNG
To: DONGBU HITEK CO., LTD.
Reel/Frame 032945/0171 →