Energy-efficient display apparatus with object-sensing capability

摘要

A display device capable of accurately sensing object presence at lower power consumption is presented, as well as a method of driving the display device. The display device includes a sensing circuit that detects the presence of an object by sensing radiation, and a radiation source array that provides radiation to the sensing circuit. First signals are provided to the scan lines of the sensing circuit, sequentially activating the sensors during a frame period. Second signals are provided to a radiation source array to selectively activate different portions of the radiation source array. The first and second signals are synchronized in their timing such that the portion of the radiation source array that supplies radiation to the activated sensors are turned on.

主权项

1. A method for driving a display device capable of sensing object presence, comprising:
providing first signals to sensing circuits that detect a presence of an object, the sensing circuits including scan lines for receiving the first signals and sensors for sensing invisible light reflected from the object; providing second signals to an invisible light source array that provides invisible light to the sensing circuits, wherein the second signals selectively activate invisible light sources in the invisible light source array; synchronizing the timing of the first and second signals so that the invisible light is selectively provided to a portion of the sensing circuits receiving the first signals, and dividing the invisible light sources into p groups, and selectively activating the p groups with second signals according to which scan lines are receiving the first signals, wherein each of the p groups is activated for equal to or less than a duration A1 wherein A1=FR1/p and FR1=a frame period, wherein the p groups include a first group and a second group and each of the p groups is divided into m subgroups, and wherein the m subgroups are simultaneously activated for equal to or less than a duration A3 wherein A3=A1/(m).