Active-matrix organic light emitting diode (AMOLED) display apparatus and brightness compensation method thereof

  • US 10,204,557 B2
  • Filed: 01/13/2016
  • Issued: 02/12/2019
  • Est. Priority Date: 08/26/2015
  • Status: Active Grant
First Claim
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1. An Active-Matrix Organic Light Emitting Diode (AMOLED) display apparatus, comprising a display panel, wherein the display panel comprises a plurality of sub-pixels, each sub-pixel comprises an Organic Light Emitting Diode (OLED) and a pixel circuit for independently driving the OLED, and the AMOLED display apparatus further comprises:

  • a drive chip, configured to output a corresponding data voltage to each sub-pixel and acquire a sensed voltage corresponding to each sub-pixel; and

    a Timing Controller (TCON), configured to;

    at an initial compensation stage, acquire a corresponding data voltage compensation value when brightness of all the sub-pixels is uniform and consistent under a condition that a brightness value of the display panel is a preset value, by regulating an initial data voltage output to each sub-pixel by the drive chip, control the drive chip to output a first data voltage to the pixel circuit of each sub-pixel according to the data voltage compensation value corresponding to each sub-pixel, acquire the sensed voltage corresponding to each sub-pixel at this stage by the drive chip, and set each sensed voltage as an initial reference voltage corresponding to each sub-pixel under the condition that the brightness value of the display panel equals the preset value; and

    at a subsequent compensation stage, by changing the data voltage output to each sub-pixel by the drive chip, make the sensed voltage corresponding to each sub-pixel to be equal to the initial reference voltage corresponding to each sub-pixel under the condition that the brightness value of the display panel equals the preset value, so as to achieve uniform compensation on brightness of each sub-pixel at the subsequent compensation stage; and

    wherein the brightness of each sub-pixel is measured by an image sensor;

    the drive chip includes a Digital-to-Analog Converter (DAC) module and an Analog-to-Digital Converter (ADC) module;

    the DAC module is configured to output the data voltage corresponding to each sub-pixel; and

    the ADC module is configured to detect the sensed voltage corresponding to each sub-pixel;

    the TCON is further configured to;

    at any one moment, when the brightness value of the display panel is not equal to the preset value, for any one sub-pixel, carry out an interpolation operation by utilizing at least two groups of standard reference data related to the any one moment calculate the data voltage which needs to be output to the pixel circuit of the any one sub-pixel at the any one moment, and control the drive chip to drive the pixel circuit of the any one sub-pixel according to the calculated data voltage,wherein each group of standard reference data related to the any one moment includes;

    a corresponding preset value, andthe data voltage for making the sensed voltage corresponding to the any one sub-pixel to be equal to the initial reference voltage related to both the corresponding preset value and the any one sub-pixel at the any one moment when the brightness value of the display panel equals the corresponding preset value;

    the standard reference data is acquired in real time by the TCON;

    the real-time acquisition of the standard reference data comprises;

    one frame of time is divided into two parts;

    one part is used for sensing the data voltage of each sub-pixel when the brightness value of the display panel equals the preset value; and

    the other part is used for carrying out corresponding displaying in accordance with an actual brightness value of the display panel.

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