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Semiconductor device and error cancellation method

A semiconductor and long-term technology, which is applied in the direction of instruments, calculations, electrical digital data processing, etc., can solve the problems of not being able to cope with AC chargers, and achieve the effect of preventing deterioration

Active Publication Date: 2019-07-16
SYNAPTICS JAPAN GK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology of this prior application is only by applying the technology described in Patent Document 1, that is, in order to reduce noise in the detection period of the capacitive touch panel, the touch panel is driven with a plurality of driving pulses of different frequencies, and the Solve the problem of not being able to cope with the problem of AC chargers by adopting a technology that only has a small effect of noise.

Method used

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  • Semiconductor device and error cancellation method
  • Semiconductor device and error cancellation method
  • Semiconductor device and error cancellation method

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Embodiment Construction

[0038] 1. Outline of Embodiment

[0039] First, an outline of the embodiments disclosed in this application will be described. The reference numerals in the drawings referred to in parentheses in the description of the outline of the embodiment are merely examples of reference numerals included in the concept of the constituent elements indicated therein.

[0040] ﹝1﹞>

[0041] The semiconductor device (10A, 10B) includes a touch panel controller (3) and a data processor (5), and the touch panel controller (3) periodically introduces drive electrodes (Y1 to YM) and detection electrodes via the touch panel Capacitive components between (X1 to XN) appear in signals of the detection electrodes to generate detection data corresponding to the above-mentioned capacitive components. The touch panel controller includes a control circuit (308) that controls a detection period (Tdc) of the periodically introduced signal and a detection period (Tdt) in each period. The data processor ...

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Abstract

Embodiments herein include a device, system, and method for periodically capturing sensing signals using one or more detection electrodes to generate data for detecting an object proximate to the detection electrodes. The sensing signals are captured during detection periods within periodic detection cycles where each of the detection cycles define a period of time between consecutive detection periods. In addition, the device, system and method set a duration of the detection cycle to 1 / m (where m is appositive integer) of a duration of a display-scan cycle. The value of m is selected based on a periodic noise signal. Thus, the device, system, and method may prevent a periodic noise signal which has a cycle that is longer than the detection period from worsening the accuracy of touch detection.

Description

technical field [0001] The present invention relates to a semiconductor device with the function of detecting and controlling the touch of a touch panel, and further relates to a method of canceling the influence caused by periodic noise in the periodical signal introduction operation, for example, relates to an integral part of a liquid crystal display panel. An effective technology applied to semiconductor control devices controlled by touch panels. Background technique [0002] In an unpublished prior application (Japanese Patent Application No. 2012-216745), the present applicant proposed a technique for preventing deterioration of touch detection accuracy caused by external noise such as AC charger noise in a portable information terminal incorporating a touch panel. That is, the output voltage of the AC charger may fluctuate at a predetermined frequency together with the local ground voltage of the AC charger. ), the global ground is equivalent to swinging at the abov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/041G06F3/044
CPCG06F3/04184G06F3/04186G06F3/0446
Inventor 石井达也田中伸和武山洋士赤井亮仁
Owner SYNAPTICS JAPAN GK