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公开(公告)号：US20170300165A1
公开(公告)日：2017-10-19
申请号：US15393125
申请日：2016-12-28
Applicant: LG Display Co., Ltd.
Inventor： MyungHo SHIN , SungUk BYUN , YongWoo CHOI , MinWoo HWANG , KiYong KIM , Youngho KWON , Kyungjin JANG , JaeKyu PARK
CPC classification number: G06F3/0416 , G06F3/0412 , G06F3/044 , G06F2203/04107 , G09G3/2092 , G09G2330/06
Abstract: A touch sensing method, a touch sensing circuit, and a touch display device perform multifrequency touch driving by varying the frequencies of touch driving signals when sensing a touch or a touched position by outputting pulse-type touch driving by which one or more touch electrodes among a number of touch electrodes disposed on a display panel are driven sequentially. Undesired parasitic capacitance that would otherwise be caused by touch driving signals is prevented from occurring, and EMI influence is reduced.
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公开(公告)号：US20190129571A1
公开(公告)日：2019-05-02
申请号：US16151749
申请日：2018-10-04
Applicant: LG Display Co., Ltd.
Inventor： YongWoo CHOI
Abstract: Exemplary embodiments of the present disclosure relate to a touch driving circuit that operates according to an internal clock signal and a touch controller that calibrates a variation in internal clock signal between touch driving circuits. The touch driving circuit operates using an internal clock signal, thus preventing electromagnetic interference caused by a clock signal line that connects the touch controller and a plurality of touch driving circuits. Further, the touch controller calibrates the output frequencies of internal clock signals of the respective touch driving circuits to be the same on the basis of the counting values of the internal clock signals of the touch driving circuits, which are obtained during a certain period before performing touch sensing, and performs touch sensing, thereby performing touch sensing while controlling the plurality of touch driving circuits operating with the internal clock signals without any operational variation.
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