Display apparatus and method of driving the same

摘要

A display apparatus includes a display panel, a backlight unit, a backlight control circuit, sensors, a read-out circuit and a sensor auxiliary circuit. The display panel includes pixels and displays an image. The backlight unit includes a first light source which emits a first light in a infrared light range. The backlight control circuit controls a brightness of the first light source. The sensors sense an external signal and outputs first sensing signals. The read-out circuit outputs the first sensing signals as second sensing signals. The sensor auxiliary circuit compares a maximum value and a minimum value of the second sensing signals and provides a brightness control signal to the backlight control circuit based on the compared difference to control the brightness of the first light source.

主权项

1. A display apparatus comprising:
a display panel comprising a plurality of pixels, wherein the display panel displays an image; a backlight unit comprising a first light source which emits a first light in an infrared light range, the backlight unit providing the first light to the display panel; a backlight control circuit which controls a brightness of the first light source; a plurality of sensors which senses an external signal corresponding to the first light reflected by an object on the display panel and outputs a plurality of first sensing signals; a read-out circuit which stores the plurality of first sensing signals and outputs a plurality of second sensing signals during a predetermined time period; and a sensor auxiliary circuit which receives the plurality of second sensing signals, compares a maximum value and a minimum value in the plurality of second sensing signals and provides a brightness control signal to the backlight control circuit based on the compared difference to control the brightness of the first light source to prevent reduced sensing capability of the plurality of sensors as time lapses, wherein the sensor auxiliary circuit comprises: a data selector which receives the plurality of second sensing signals and outputs the maximum value and the minimum value; a comparator which compares a difference between the maximum value and the minimum value with a predetermined reference value, outputs a first control signal when the difference between the maximum value and the minimum value is greater than or equal to the reference value, and outputs a second control signal when the difference between the maximum value and the minimum value is less than the reference value; and a control signal generator which outputs a first brightness control signal in response to the first control signal to maintain the brightness of the first light source and outputs a second brightness control signal in response to the second control signal to increase the brightness of the first light source.