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Mutual hover protection for touchscreens

A user, capacitive technology, applied in the input/output process of data processing, instruments, calculations, etc., to solve problems such as false touch detection

Active Publication Date: 2020-06-16
STMICROELECTRONICS ASIA PACIFIC PTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most commonly, false touch detection occurs when the user hovers a finger over the touch sensor but does not actually touch the sensor and intends to touch the sensor
In some cases, false touch detection may occur when a finger hovers 1-3mm above the surface of the touchscreen

Method used

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  • Mutual hover protection for touchscreens
  • Mutual hover protection for touchscreens
  • Mutual hover protection for touchscreens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The present disclosure provides a touch sensor and method for detecting small contact surface areas without false touch detection due to a user's finger hovering over the touch sensor. In other words, the disclosed touch sensors and methods are capable of differentiating between a finger hovering over a touch sensor and a touch from a stylus with a small contact surface area without having to adjust the sensitivity of the touch sensor.

[0019] Now refer to figure 1 , which illustrates an example embodiment of a conventional touch sensor 100 having sense electrodes 102 and transmit electrodes 104 . In operation, touch sensor 100 receives a force signal applied to transmit electrode 104 . There is capacitance between the transfer electrode 104 and the sense electrode 102 . A touch applied to touch sensor 100 causes a change in capacitance between transfer electrode 104 and sense electrode 102 . This change in capacitance is used to detect user touches.

[0020] For e...

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PUM

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Abstract

A capacitive sensing structure includes a first sensing electrode located in a first layer for sensing a first capacitance and producing a first sense signal indicative of the sensed first capacitance. A transmit electrode is located in the first layer and positioned surrounding 90%+ of a perimeter of the first sensing electrode. A second sensing electrode is located in the first layer and positioned surrounding 90%+ of a perimeter of the transmit electrode, the second sensing electrode to sense a second capacitance and produce a second sense signal indicative of the sensed second capacitance. Controller circuitry receives the first and second sense signals, compares a change in the sensed first capacitance to a change in the sensed second capacitance, and produces an output signal indicative of a user touch based upon the comparison between the change in the sensed first capacitance and the change in the sensed second capacitance.

Description

technical field [0001] The present disclosure relates generally to capacitive touch screen panels, and more particularly to a touch sensor arrangement for use in a capacitive touch screen. Background technique [0002] Conventional touch screen sensors are designed to detect user touches, which are typically expressed using a finger or stylus. Many styli are designed with small surface areas for contacting touch screen devices. For example, a stylus may have a contact surface area with a diameter of about 1 mm. A stylus with a small contact surface area is more difficult to detect than a stylus with a larger contact surface area. Many conventional touch screen devices compensate for the difficulty of detecting a stylus with a small contact surface area by increasing the sensitivity of the touch sensor (eg, by reducing the capacitive detection threshold of the touch sensor). [0003] Unfortunately, as the sensitivity of the touch sensor increases, so does the detection of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044
CPCG06F3/044G06F2203/04108G06F3/04166G06F3/0443
Inventor P·钱德兰G-H·洛R·布哈蒂亚Y·昂
Owner STMICROELECTRONICS ASIA PACIFIC PTE