Display apparatus, control method and compensation coefficient calculation method thereof

Patent metadata

Field	Value
Publication number	US-10825377-B2
Application number	US-201715843250-A
Country	US
Kind code	B2
Filing date	Dec 15, 2017
Priority date	Jan 10, 2017
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A display apparatus, including a display panel which includes a light emitting element, a storage configured to store a plurality of compensation coefficients corresponding to a plurality of gray levels according to a parasitic capacitance of the light emitting element, and a processor configured to obtain a compensation coefficient from the plurality of compensation coefficients based on at least one of a position of a scan line and a gray level of scan data, compensate the gray level of the scan data based on the obtained compensation coefficient, and drive the light emitting element based on the compensated gray level.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel comprising a plurality of scan lines comprising a plurality of light emitting elements, each light emitting element comprising a light emitting diode (LED) corresponding to a sub pixel;
a storage configured to store a plurality of compensation coefficients corresponding to a plurality of gray levels; and
a processor configured to:
determine a scan line for compensation from among the plurality of scan lines,
obtain a compensation coefficient corresponding to a gray level of image data of the scan line, from among the plurality of compensation coefficients,
compensate the gray level of the image data of the scan line by increasing the gray level of the image data of the scan line based on the obtained compensation coefficient, and
drive LEDs of the scan line based on the compensated gray level,

wherein a luminance of LEDs of an adjacent scan line disposed next to the scan line based on a current being applied to the adjacent scan line is higher than a luminance of the LEDs of the scan line based on a current being applied to the scan line by a parasitic capacitance of the LEDs of the scan line, and
wherein the parasitic capacitance is a charge storage capacitance generated in the LEDs of the scan line based on forward bias being applied to the LEDs of the scan line.

2. The display apparatus as claimed in claim 1 , wherein the processor is configured to determine a difference between the gray level of the image data of the scan line and a gray level of image data of the adjacent scan line, and based on the determined difference being larger than a threshold value, determine the scan line as the scan line for compensation, and
wherein the processor is configured to determine a first scan line from among the plurality of scan lines as the scan line for compensation, regardless of a gray level of image data of the first scan line.

3. The display apparatus as claimed in claim 2 , wherein the plurality of light emitting elements comprises a plurality of light emitting diodes (LEDs) divided into a plurality of LED areas,
wherein the processor comprises a plurality of LED drivers for driving the plurality of LED areas, and
wherein the processor is further configured to obtain the compensation coefficient from the storage corresponding to the gray level of the image data of the scan line of an LED area from among the plurality of LED areas.

4. The display apparatus as claimed in claim 1 , wherein the light emitting element comprises a plurality of sub pixels, and
wherein the processor is further configured to compensate the gray level of the image data of the scan line based on a compensation coefficient corresponding to each of the plurality of sub pixels.

5. A method of controlling a display apparatus which comprises display panel comprising a plurality of scan lines comprising a plurality of light emitting elements and stores a plurality of compensation coefficients corresponding to a plurality of gray levels, each light emitting element comprising a light emitting diode (LED) corresponding to a sub pixel, the method comprising:
determining a scan line for compensation from among the plurality of scan lines,
obtaining a compensation coefficient corresponding to a gray level of image data of the scan line from among the plurality of compensation coefficients;
compensating the gray level of the image data of the scan line by increasing the gray level of the image data of the scan line based on the obtained compensation coefficient;
driving LEDs of the scan line based on the compensated gray level,
wherein a luminance of LEDs of an adjacent scan line disposed next to the scan line based on a current being applied to the adjacent scan line is higher than a luminance of the LEDs of the scan line based on a current being applied to the scan line by a parasitic capacitance of the LEDs of the scan line, and
wherein the parasitic capacitance is a charge storage capacitance generated in the LEDs of the scan line based on forward bias being applied to the LEDs of the scan line.

6. The method as claimed in claim 5 , further comprising:
wherein the determining comprises determining a difference between the gray level of the image data of the scan line and a gray level of image data of the adjacent scan line, and based on the determined difference being larger than a threshold value, determine the scan line as the scan line for compensation, and
wherein the determining comprises determining a first scan line from among the plurality of scan lines as the scan line for compensation, regardless of a gray level of image data of the first scan line.

7. The method as claimed in claim 5 , wherein the plurality of light emitting elements comprises a plurality of light emitting diodes (LEDs) divided into a plurality of LED areas,
wherein the plurality of LED areas are driven by a plurality of LED drivers, and
wherein the gray level of the image data of the scan line of an LED area of the plurality of LED areas.

8. The method as claimed in claim 5 , wherein the light emitting element comprises a plurality of sub pixels, and
wherein the compensating the gray level of the image data of the scan line comprises compensating the gray level of the image data of the scan line based on a compensation coefficient corresponding to each of the plurality of sub pixels.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Ho-Seop
• Kwag Do-Young
• Shigeta Tetsuya
• Cho Seong-Phil

Classifications

• G09G2310/067

  Special waveforms for scanning, where no circuit details of the gate driver are given · CPC title

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title

• G09G2320/064

  by time modulation of the brightness of the illumination source · CPC title