Capacitive in-cell touch screen and display device

摘要

In a capacitive in-cell touch screen and a display device, the common electrode layer connected in the entire surface in the array substrate is divided to form touch driving electrodes and common electrodes which are insulated from each other and alternatively disposed, touch sensing electrodes are disposed on the upper substrate and touch driving electrodes are driven in a time-division manner to realize touch function and display function. Disposing projections of touch sensing electrodes on the array substrate in areas where common electrodes are may reduce right opposite areas between touch sensing electrodes and touch driving electrodes, thereby reduce opposite capacitance; providing sides of touch driving electrodes and adjacent sides of common electrodes as broken lines and providing consistent shapes for touch sensing electrodes and common electrodes may increase opposite areas between touch driving electrodes and touch sensing electrodes, thereby increasing projection capacitance per unit area. By increasing the proportion of projection capacitance over opposite capacitance, it is possible to increase proportion of variation amount of mutual capacitance caused by finger touching, and hence improving the touch accuracy.

主权项

1. A capacitive in-cell touch screen, comprising an upper substrate, an array substrate with a common electrode layer and a liquid crystal layer between the upper substrate and the array substrate, wherein
the common electrode layer consists of a plurality of touch driving electrodes and a plurality of common electrodes, and the plurality of touch driving electrodes and the plurality of common electrodes are insulated from each other and disposed alternatively, and sides of each of the touch driving electrodes and sides of each of the common electrodes adjacent to the touch driving electrodes are both non-straight lines; in a display time for one frame of picture, the touch driving electrodes are loaded with common electrode signals and touch scanning signals in a time-division manner; the upper substrate has a plurality of touch sensing electrodes, of which orthogonal projections on the array substrate are located in areas where the common electrodes are, and the shape of the touch sensing electrodes coincide with the shape of the areas where the common electrodes are.