Touch driving circuit, optical in cell touch panel and display device

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,
• wherein the photosensitive sub-module further comprises a photosensitive transistor;
• wherein a gate of the photosensitive transistor is connected with the switch signal terminal, a source of the photosensitive transistor is connected with the gate signal terminal, and a drain of the photosensitive transistor is connected with the first signal input terminal of the driving sub-module.