Touch screen display device

摘要

A touch screen display device includes a plurality of display pixels for generating an image, emitters interspersed among the display pixels and emitting light, and detectors interspersed among the display pixels for detecting light. The light from the emitters is coupled into a transparent substrate to reach the front surface which transmits light incident at an angle smaller than a critical angle and which totally internally reflects light which is incident at an angle greater than the critical angle. The display device further includes processing means coupled to the emitters and detectors for detecting the light reaching each detector from different specific emitters and determining the light that is received by each detector that may be due to direct reflection from a near-field object, and the light that is totally internally reflected and which may be frustrated by a touching object.

主权项

1. A touch screen display device comprising:
a plurality of display pixels arranged upon a back plane of the touch screen display device, a transparent body having a front surface and a back surface, wherein the display pixels are disposed to transmit electromagnetic radiation through the transparent body from the back surface to the front surface, a plurality of emitters interspersed upon the back plane among the display pixels and emitting electromagnetic radiation so as to reach the front surface through the transparent body, and a plurality of detectors, interspersed upon the back plane among the display pixels, for detecting electromagnetic radiation, wherein the electromagnetic radiation emitted by an emitter at an angle smaller than the critical angle to the normal to said front surface of the transparent body is transmitted through said front surface and the electromagnetic radiation emitted by the emitter at an angle greater than the critical angle to the normal to said front surface is totally internally reflected, the touch screen display device further comprising processing apparatus coupled to the emitters and detectors operable to identify the electromagnetic radiation reaching each detector from different specific emitters and to discriminate between electromagnetic radiation that may be received by each detector by reflection from a near field object adjacent but not touching said front surface which is identified as an increase in the measured intensity of the light received by a respective detector, and electromagnetic radiation the total internal reflection of which may be frustrated by an object touching said front surface which is identified as a reduction in the measured intensity of the light received by a respective detector.