# US 2014/0152607 A1 · Touch-sensing device using self-sensing signals to implement proximity detection function and related proximity detection method thereof

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- Number: US 2014/0152607 A1
- Document ID: US20140152607A1
- Status: Published application
- Kind: A1
- Application number: 13/705,133
- Filed: 2012-12-04
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: Himax Technologies Limited
- Applicants: Himax Technologies Limited
- Inventors: Chin-Lin Lee; Shen-Feng Tai; Jui-Ming Liu; Cheng-Feng Hsieh
- Web page: https://patentgrep.com/patent/US20140152607A1

## CPC

- G06F 1/3215: Monitoring of peripheral devices
- G06F 1/3231: Monitoring the presence, absence or movement of users
- G06F 1/3262: {Power saving in digitizer or tablet}
- G06F 1/3265: {Power saving in display device}
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A touch-sensing device with a proximity detection function includes a capacitive touch panel and a control circuit. The capacitive touch panel is arranged for generating a plurality of self-sensing signals via a plurality of traces, respectively. The control circuit is coupled to the capacitive touch panel, and arranged for receiving the plurality of self-sensing signals from the capacitive touch panel, and determining whether there is an object approaching the capacitive touch panel according to the plurality of self-sensing signals.

## Claims

### Claim 1

A touch-sensing device with a proximity detection function, comprising:
a capacitive touch panel, arranged for generating a plurality of self-sensing signals via a plurality of traces, respectively; and
a control circuit, coupled to the capacitive touch panel, for receiving the plurality of self-sensing signals from the capacitive touch panel, and determining whether there is an object approaching the capacitive touch panel according to the plurality of self-sensing signals.

### Claim 2 (depends on 1)

The touch-sensing device of claim 1, wherein the control circuit generates a sensing value corresponding to a summation of the plurality of self-sensing signals, and compares the sensing value with a predetermined threshold to determine whether the object approaches the capacitive touch panel.

### Claim 3 (depends on 2)

The touch-sensing device of claim 2, wherein the control circuit determines that there is no object approaching the capacitive touch panel when the sensing value is smaller than the predetermined threshold.

### Claim 4 (depends on 2)

The touch-sensing device of claim 2, wherein the control circuit determines that the object is approaching the capacitive touch panel when the sensing value is larger than the predetermined threshold.

### Claim 5 (depends on 1)

The touch-sensing device of claim 1, wherein the touch-sensing device further supports a user interface function, and the capacitive touch panel is further arranged to act as an interactive user interface.

### Claim 6

A control circuit of a capacitive touch panel for proximity detection, comprising:
a receiving unit, arranged for receiving a plurality of self-sensing signals from the capacitive touch panel;
a processing unit, coupled to the receiving unit, for generating a sensing value corresponding to a summation of the plurality of self-sensing signals; and
a determining unit, coupled to the processing unit, for comparing the sensing value with a predetermined threshold to determine whether there is an object approaching the capacitive touch panel.

### Claim 7 (depends on 6)

The control circuit of claim 6, wherein the determining unit determines that there is no object approaching the capacitive touch panel when the sensing value is smaller than the predetermined threshold.

### Claim 8 (depends on 6)

The control circuit of claim 6, wherein the determining unit determines that the object is approaching the capacitive touch panel when the sensing value is larger than the predetermined threshold.

### Claim 9

A proximity detection method, comprising:
receiving a plurality of self-sensing signals from a capacitive touch panel; and
determining whether there is an object approaching the capacitive touch panel according to the plurality of self-sensing signals.

### Claim 10 (depends on 9)

The proximity detection method of claim 9, wherein the step of determining whether there is an object approaching the capacitive touch panel comprises:
generating a sensing value corresponding to a summation of the plurality of self-sensing signals; and
comparing the sensing value with a predetermined threshold to determine whether the object approaches the capacitive touch panel.