The invention provides a kind of touch unit, touch module, embedded touch screen and display device. Touch unit electric bridge, the first bridge arm, the second bridge arm and the third bridge arm of the electric bridge are respectively arranged with the first fixed resistance unit, the second fixed resistance unit and the third fixed resistance unit. Another bridge arm of the electric arm is provided with light sensation control module.Light sensation control module includes controlling switch. The control end is connected with a touch-control scan line and the first end is connected with a high level output end. As well as photo conductive resistance unit, the first end is connected with the second end of the controlling switch and the second end is respectively with the second end of the third fixed resistance and touch-control read line. The invention solves the problem which illumination can not be quickly and accurately converted to electric signal, and transmitted to touch-control read line in the available technology, so as to causing to unfaithfully detect touch-control and judging the touch position.