TOUCH DRIVING CIRCUIT, OPTICAL IN CELL TOUCH PANEL AND DISPLAY DEVICE

摘要

Embodiments of the present disclosure provide a touch driving circuit, an optical in cell touch panel and a display device, the touch driving circuit comprises a driving sub-module, a photosensitive sub-module, and a controlling sub-module. The photosensitive sub-module outputs a touch signal to the driving sub-module under controls of the switch signal terminal and the gate signal terminal; the driving sub-module outputs a touch sensing signal to the controlling sub-module under a control of the touch signal, and the touch sensing signal decreases as an intensity of light radiated on the photosensitive sub-module increases; and the controlling sub-module outputs the touch sensing signal to the touch signal reading terminal when the control signal terminal controls the controlling sub-module to be in a turn-on state, thus achieving the touch function. As compared with the driving circuit in the existing optical in cell touch panel, the controlling sub-module is utilized to control the driving sub-module so as to output the touch sensing signal to the touch signal reading terminal, in a case in which the touch signal reading terminals of the respective stages of the driving circuits are connected to a same touch signal reading line, a crosstalk can be prevented from occurring in the signals outputted from the different stages of the driving circuits.

主权项

1. A touch driving circuit comprising a photosensitive sub-module, a driving sub-module and a controlling sub-module, wherein,
a first signal input terminal of the photosensitive sub-module is connected with a switch signal terminal, a second signal input terminal of the photosensitive sub-module is connected with a gate signal terminal, a signal output terminal of the photosensitive sub-module is connected with a first signal input terminal of the driving sub-module; the photosensitive sub-module is configured to output a touch signal to the driving sub-module under controls of the switch signal terminal and the gate signal terminal; a second signal input terminal of the driving sub-module is connected with a reference signal terminal, a third signal input terminal of the driving sub-module is connected with a control signal terminal and a first signal input terminal of the controlling sub-module, respectively, a signal output terminal of the driving sub-module is connected with a second signal input terminal of the controlling sub-module; the driving sub-module is configured to output a touch sensing signal to the controlling sub-module under a control of the touch signal, the touch sensing signal decreasing as an intensity of light irradiated on the photosensitive sub-module increases; and a signal output terminal of the controlling sub-module is connected with a touch signal reading terminal; the controlling sub-module is configured to output the touch sensing signal to the touch signal reading terminal when the control signal terminal controls the controlling sub-module to be in a turn-on state.