Patent ID: 9207851
Filing Date: 2015-12-08
Classification: G06F

Abstract:
1. A display device configured to display output images and sense input user interaction comprising: a liquid crystal layer including individually addressable pixels of liquid crystal material; first driving circuitry that selectively controls transmissivity to light in the visible spectrum of individual ones of the pixels of the liquid crystal layer; a matrix of light emitting diodes positioned behind the liquid crystal layer, the matrix including a plurality of light emitting diodes being arranged in rows and columns; second driving circuitry that operates a first subset of spatially distributed light emitting diodes to alternatively emit light through the liquid crystal layer and detect light transmitted through the liquid crystal display, while the first subset of spatially distributed light emitting diodes is being operated to emit light, the second driving circuitry operates a second subset of spatially distributed light emitting diodes of the plurality of light emitting diodes to detect light transmitted through the liquid crystal layer, and while the first subset of light emitting diodes is being operated to detect light, the second driving circuitry operates the second subset of spatially distributed light emitting diodes to detect light transmitted through the liquid crystal layer, and wherein each of the first and second subsets of spatially distributed light emitting diodes emit light to provide a uniform plane of light as backlight illumination for the liquid crystal layer; an electronic storage device that stores output representative of a light level received from each of the plurality of light emitting diodes when the light emitting diode is being operated to detect light; and a processing element that determines that a user input event has occurred proximate to a light emitting diode, if a light level detected by the light emitting diode is in a predetermined range.