Lg Display Co., Ltd.

MyungHo Shin

HyeongWon Kang

Jaehun Jun

KiYong Kim

YoungGyu Kim

Yoonnara Jang

JaeKyu Park

Kyungjin Jang

SuWon Lee

SungUk Byun

JongGu Heo

YongWoo Choi

MinWoo Hwang

Youngho Kwon

A display device can include a display panel including a gate line, a data line, and a pixel connected to the gate line and the data line; a plurality of touch electrodes; and a touch sensing circuit configured to supply a first touch driving signal to a first touch electrode in a first touch time section of a first frame, the first frame including a first display time section and the first touch time section, and supply a second touch driving signal to the first touch electrode in a second touch time section of a second frame, the second frame including a second display time section and the second touch time section. Also, a frequency of the first touch driving signal supplied to the first touch electrode is different from a frequency of the second touch driving signal applied to the first touch electrode.

Driving method, touch sensing circuit, display panel, and touch display device

A touch sensing circuit can include a plurality of touch electrodes; and a touch circuit configured to supply at least one touch driving signal to at least one of the plurality of touch electrodes, in which the at least one touch driving signal includes a first touch driving signal and a second touch driving signal, and the first touch driving signal has a first frequency in a first touch period included in a first frame, and the second touch driving signal has a second frequency different from the first frequency in a second touch period included in a second frame subsequent to the first frame.

A touch device can include a plurality of touch electrodes including a first touch electrode and a second touch electrode; and a touch sensing circuit configured to supply a touch driving signal to at least one of the plurality of touch electrodes in a touch period, the touch period including a first touch period and a second touch period, in which the touch driving signal includes a first touch driving signal or a second touch driving signal; and the touch sensing circuit can supply the first touch driving signal having a first frequency to the first touch electrode for sensing a touch in the first touch period, supply a first load-free driving signal having the first frequency to the second touch electrode in the first touch period, supply the second touch driving signal having a second frequency to the second touch electrode for sensing a touch in the second touch period, and supply a second load-free driving signal having the second frequency to the first touch electrode in the second touch period.

Embodiments of the present disclosure relate to a touch display device, a touch driving circuit, and a touch driving method, and more specifically, to a touch display device, a touch driving circuit, and a touch driving method for enabling a signal-to-noise ratio (SNR) and sensitivity of touch sensing to be improved by implementing a code division sensing effect for the self-capacitance sensing scheme.

Touch display device, touch driving circuit and touch driving method thereof

Discussed are a driving method, a touch sensing circuit, a display panel, and a touch display device in which touch driving of driving touch electrodes using a multi-frequency driving method while modulating a frequency of a touch driving signal of a pulse type. The touch driving signal drives at least one touch electrode and senses a touch or a touch position in touch sections for a touch mode. Each of the touch sections for the touch mode includes k or more unit touch sections. The frequency of the touch driving signal output in at least one unit touch section is different from the frequency of the touch driving signal output in another unit touch section. Accordingly, it is possible to enable touch sensing and to suppress an EMI phenomenon which may occur due to the touch driving signal.

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.

Touch sensing method, touch sensing circuit, and touch display device

A touch sensing device includes a touch screen including Tx lines, Rx lines crossing the Tx lines, and touch sensors formed between the Tx lines and the Rx lines, and a touch screen driving circuit which senses all the touch sensors of the touch screen in a first sensing step to detect the presence or absence of a touch input, and then again senses the touch sensors, in which the touch input is detected as a first sensing result, in a second sensing step to detect a position of the touch input. When there is no touch sensor, in which the touch input is detected as the first sensing result, the touch screen driving circuit repeats the first sensing step.

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Paju-si, South Korea

MyungHo Shin