Patent ID: 9495032
Filing Date: 2016-11-15
CPC Classification: G06F

Claim Text:
1. An optical touch screen, comprising: a substrate; a first electrode layer, a photosensitive material layer, and a second electrode layer that are formed on the substrate, the first electrode layer being a transparent electrode, and the photosensitive material layer being formed in a grid-like structure, isolating the first electrode layer and the second electrode layer, and sensing light irradiated on the optical touch screen; and a first constant voltage source and a second constant voltage source, wherein the first constant voltage source is connected to one end of the transparent first electrode layer or the second electrode layer through a plurality of current output paths, the second constant voltage source is connected to the other end opposite to the end of the electrode layer connected to the first constant voltage layer through a plurality of current output paths, a voltage of the first constant voltage source is equal to and has a same polarity with a voltage of the second constant voltage source, so as to make entirety of the electrode layer have a same voltage; the other electrode layer is connected to a third constant voltage source, and a voltage of the third constant voltage source is different from the voltages of the first constant voltage source and the second constant voltage source; wherein, where light irradiates on the optical touch screen, the first electrode layer conducts with the second electrode layer, and a position where the light irradiates is determined according to magnitudes of currents output from each of the current output paths.