Circuit and driving method for correcting tone output of a pixel

摘要

A display device capable of correcting display of deteriorated pixels without causing a nonconstant tonality or improper color balance is provided. The display device includes a display section with plural pixels; signal lines; a data generation circuit; a D/A converter for sequentially converting a tone data to an analog voltage and outputting the analog voltage to the signal lines; a switch circuit for outputting a signal corresponding to the pixel state by switching the signal lines; an A/D converter for sequentially detecting the signal; and a detection circuit for estimating the state of the pixel from the signal. The D/A converter includes an output range setting means for setting an allowed output range of the analog voltage. The display device includes an output correction circuit that controls the output range setting means in accordance with the state of the pixel detected by the detection circuit.

主权项

1. A display device comprising a display section, a driver and signal lines connecting the display section and the driver,
the display section including a plurality of pixels formed in a matrix where each of the pixels includes a self light-emitting element, the driver including: a data generation circuit for generating tone data of the respective pixels from display data supplied from an external device; a D/A converter coupled to the signal lines and coupled to receive the tone data from the data generation circuit, said D/A converter being configured to convert the tone data generated by the data generation circuit to an analog voltage and outputting the analog voltage to the signal lines; a switch circuit for switching a direction of signal flow along the signal lines; a detection circuit for detecting a signal of respective pixels obtained from the display section through the switch circuit; and a correction value calculation circuit for generating a correction value based on the signal of respective pixels detected by the detection circuit, wherein the driver further comprises an output correction circuit coupled to the D/A converter for setting an output range of the analog voltage to be output from the D/A converter in accordance with the correction value generated by the correction value calculation circuit, wherein the data generation circuit comprises a gamma correction circuit for performing, when generating the tone data from the display data to be provided to the D/A converter, a gamma correction and a display luminance correction based on the correction value, wherein the output correction circuit and the gamma correction circuit are separately connected to the D/A converter so that the output correction circuit sets the output range to be output from to D/A converter in accordance with the correction value, separately from the gamma correction performed by the gamma correction unit.