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Method for detecting capacitance values and corresponding touch controller

A technology of touch controller and detecting capacitance, applied in the direction of instrument, electrical digital data processing, input/output process of data processing, etc., can solve the inaccuracy of phase delay measurement and compensation, increase the complexity, reduce the performance of touch control system, etc. problem, to achieve the effect of improving the detection accuracy

Inactive Publication Date: 2013-10-30
MEDIATEK INC
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Problems solved by technology

However, different driving lines may introduce different phase delays in the sensing output, resulting in complexity in determining the mutual capacitance value corresponding to the intersection (intersection, ie, crossover point) of the driving and sensing lines Increase
Also, since phase delay changes with ambient temperature, phase delay measurement and compensation can be inaccurate, degrading overall touch control system performance

Method used

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  • Method for detecting capacitance values and corresponding touch controller
  • Method for detecting capacitance values and corresponding touch controller
  • Method for detecting capacitance values and corresponding touch controller

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Embodiment Construction

[0015] Certain terms are used throughout the description and claims to refer to particular components. It should be understood by those skilled in the art that manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a basis for distinction. The "comprising" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described that the first device is coupled to the second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0016] The main idea of ​​the present invention is t...

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Abstract

A method for detecting capacitance values of a plurality of capacitive sensing nodes located at intersections of a plurality of drive lines and a sense line on a touch panel is provided. The method includes at least the following steps: obtaining a plurality of touch sense signals corresponding to the sense line during a plurality of time slots, respectively; demodulating the touch sense signals with a first oscillation signal to generate a plurality of first demodulated signals; demodulating the touch sense signals with a second oscillation signal to generate a plurality of second demodulated signals, wherein the second oscillation signal is different from the first oscillation signal; and determining the capacitance values according to at least the first demodulated signals and the second demodulated signals.

Description

【Technical field】 [0001] The present invention relates to detecting capacitance of a touch screen, and more particularly to a method and device for detecting capacitance (eg, mutual capacitance) of a capacitive sensing node of a touch screen using oscillating signals with different phases. 【Background technique】 [0002] Currently, touch screen devices have been widely used in various applications as user interfaces. In general, a touch screen device may include a touch screen and a touch controller. Some applications may use capacitive touch screens (for example, mutual capacitive touch screens). In this case, the touch controller generates a driving input to the capacitive touch screen, receives a sensing output generated from the capacitive touch screen, and determines a mutual capacitance value for detecting a touch event with reference to the sensing output. [0003] For some touchscreen systems, multiple drive lines (ie, row traces) of a mutual-capacitance touchscree...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
Inventor 郭中仁刘碧海
Owner MEDIATEK INC
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