Touch display device, touch display panel, and driving circuit
AssigneeLG Display Co., Ltd.
InventorsHoon JANG, SoonDong CHO, Wonyong JANG
Life of this patent
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Abstract
Disclosed are a touch display device, a touch display panel, and a driving circuit. More specifically, the present disclosure provides a touch display device, a touch display panel, and a driving circuit which can simultaneously perform display driving and touch driving through a ground modulation technique.
Claims20
A touch display device, comprising:
- a touch display panel having multiple data lines and multiple gate lines arranged therein, having multiple touch electrodes arranged therein, and having multiple touch lines, which are electrically connected to the multiple touch electrodes so as to correspond to the multiple touch electrodes, arranged therein;
- a touch driving circuit configured to drive at least one touch electrode among the multiple touch electrodes;
- and
- a touch controller configured to sense whether there is a touch made by at least one of a finger and a pen, or a position of the touch on the basis of touch sensing data received from the touch driving circuit,
- wherein the touch controller is grounded to a primary ground,
- the touch display panel is grounded to a secondary ground which is a ground different from the primary ground, and
- the touch display device further comprises a ground modulation circuit configured to apply a modulation signal to the primary ground or the secondary ground such that one ground voltage among a primary ground voltage of the primary ground and a secondary ground voltage of the secondary ground becomes a modulated ground voltage as compared with the remaining ground voltage.
A touch display panel, comprising:
- multiple data lines for data driving;
- multiple gate lines for gate driving;
- multiple touch electrodes for touch sensing;
- and
- multiple touch lines electrically connected to the multiple touch electrodes,
- wherein data voltages are applied to the multiple data lines while a touch driving signal is applied to at least one touch electrode among the multiple touch electrodes, and
- the touch driving signal applied to the at least one touch electrode among the multiple touch electrodes has at least one signal characteristic corresponding to a signal characteristic of a ground voltage of a ground, to which the touch display panel is grounded, among signal characteristics comprising a frequency, a phase, a voltage polarity, and an amplitude.
A driving circuit for driving a touch display panel having multiple data lines and multiple gate lines arranged therein, having multiple touch electrodes arranged therein, and having multiple touch lines, which are electrically connected to the multiple touch electrodes so as to correspond to the multiple touch electrodes, arranged therein, the driving circuit comprising:
- a data input unit configured to receive, as input, image data from a display controller;
- a data converter configured to convert the image data into data voltages corresponding to analog voltages;
- and
- a data output unit configured to output the data voltages to data lines,
- wherein the data input unit receives, as input, the image data from the display controller grounded to a primary ground, and
- the data output unit outputs the data voltages to data lines arranged in the touch display panel grounded to a secondary ground which is a ground different from the primary ground.
A driving circuit for driving a touch display panel having multiple data lines and multiple gate lines arranged therein, having multiple touch electrodes arranged therein, and having multiple touch lines, which are electrically connected to the multiple touch electrodes so as to correspond to the multiple touch electrodes, arranged therein, the driving circuit comprising:
- a pre-amplifier configured to receive touch sensing signals from the touch electrodes;
- an integrator configured to integrate a signal output from the pre-amplifier;
- and
- an analog-to-digital converter configured to output touch sensing data obtained by converting an integration value output from the integrator into a digital value,
- wherein the analog-to-digital converter outputs the touch sensing data to a touch controller grounded to a primary ground, and
- the pre-amplifier receives a touch sensing signals from the touch electrodes arranged in the touch display panel grounded to a secondary ground which is a ground different from the primary ground.
A touch display device, comprising:
- a touch display panel having multiple data lines and multiple gate lines arranged therein, having multiple touch electrodes arranged therein, and having multiple touch lines, which are electrically connected to the multiple touch electrodes so as to correspond to the multiple touch electrodes, arranged therein;
- a driving circuit configured to drive the touch display panel;
- and
- a controller configured to control the driving circuit,
- wherein the controller is grounded to a primary ground,
- the touch display panel is grounded to a secondary ground which is a ground different from the primary ground,
- a secondary voltage of the secondary ground is a modulated ground voltage as compared with a primary ground voltage of the primary ground, and
- the touch display device further comprises a power source separation circuit configured to electrically separate the primary ground from the secondary ground.
Dependencies are inferred from the claim text.