Built-in capacitive touch screen crystal display module and driving method thereof

Abstract

The invention discloses a built-in capacitive touch screen crystal display module and a driving method thereof. The crystal display module comprises a common electrode layer; the common electrode layer includes a first common electrode and a second common electrode; a frame of time of the crystal display module is divide into display time and touch control time by utilizing a control circuit; in the period of the display time, a display signal is exerted to the common electrode layer to enable the crystal screen to normally display an image, while in the period of the touch control time, through exerting a first touch control signal to the first common electrode and exerting a second touch control signal to the second common electrode, the electric potential of the first common electrode is equal to that of a driving line, the electric potential of the second common electrode is equal to that of a sensing line; since at least a part of the driving line is overlapped with the first common electrode, and at least a part of the sensing line is overlapped with the second common electrode; and the first common electrode and the driving line as well as the second common electrode and the sensing line form capacitors, and the electric potentials of the two electrode plates of the two capacitors are equal, so that at least a part of the noise generated by the crystal screen can be shielded, and further, the signal-to-noise ratio of the touch screen is improved.

Description

technical field [0001] The invention relates to the fields of touch sensing and liquid crystal display, in particular to an embedded capacitive touch screen liquid crystal display module and a driving method thereof. Background technique [0002] A touch screen is a touch-sensing input device that is widely used now. According to the principle of touch sensing, existing touch screens include resistive touch screens, capacitive touch screens, surface infrared touch screens, and the like. Among them, the resistive touch screen has been popular for many years due to its advantages of low cost, easy implementation, and simple control. In recent years, capacitive touch screens have been welcomed by the public for their high light transmittance, wear resistance, resistance to environmental temperature changes, environmental humidity changes, long life, and the ability to realize advanced and complex functions such as multi-touch. [0003] The technology of integrating a touch sc...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the low signal-to-noise ratio of existing embedded touch screens