The present application provides a touch display screen, comprising: a display panel; a touch device located at the light emitting side of the display panel, and the touch device has a touch surface, comprising: a light emitting component for providing at least positioning light and at least high-energy light; a light
receiver for detecting the light change amount of the positioning light on the touch surface due to touch, for determining the position of the touch on the touch surface; a biological sensor for determining whether a
living body is close to the touch surface; and a controller for driving the light emitting component to selectively provide the positioning light and / or the high-energy light to the touch surface according to the judgment of the biological sensor. The present application can provide the
ultraviolet light sterilization function of the
touch panel while preventing the user from being negatively affected by the
ultraviolet light during the touch operation, and saving the
power consumption of the touch display screen.