APPARATUS FOR COMPENSATING COLOR CHARACTERISTICS IN DISPLAY DEVICE AND COMPENSATING METHOD THEREOF

• US 20140306979A1
• Filed: 01/17/2014
• Published: 10/16/2014
• Est. Priority Date: 04/10/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Chun, Byung-Ki, Choi, Yong-Seok, Lee, Joo-Hyung, Park, Jong-Woong, Yang, Dong-Wook
• Granted Patent: US 9,299,283 B2
• Time in Patent Office: Days
• US Class Current: 345/589
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 3/12 using electroluminescent elements
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]

Abstract

An apparatus and method for compensating color characteristics in individual display devices that each include a display unit including a plurality of pixels to display images according to compensated image data signals, a test data input section to transmit a predetermined test image data signal to the pixels to display a test image, a luminance measuring unit to receive luminance information from the display unit displaying the test image and determine actual luminance ratios of a first color, a second color, and a third color from the received luminance information, a compensation ratio determiner to calculate a compensation ratio from both the actual and reference luminance ratios of each color and a data compensator to generate the compensated image data signals by adjusting external input video signals according to the compensation ratio.

Claims

1. A display device, comprising:

a display unit including a plurality of pixels to display images according to compensated image data signals;

a test data input section connected to a display unit to transmit a predetermined test image data signal to the pixels of the display unit to display a test image;

a luminance measuring unit configured to receive luminance information from the display unit displaying the test image according to the test image data signal, and determine actual luminance ratios of a first color, a second color, and a third color from the received luminance information;

a compensation ratio determiner configured to calculate a compensation ratio for compensating color errors of the first color, the second color, and the third color using the actual luminance ratios of the first color, the second color, and the third color; and

a data compensator configured to generate the compensated image data signals by adjusting external input video signals according to the compensation ratio and to transmit the compensated image data signals to the display panel.

2. The display device of claim 1, further comprising a reference luminance memory configured to store reference luminance information that includes a sum of reference luminance ratios according to grayscale data signals of the first color, the second color, and the third color, and to transmit the reference luminance information of the first color, the second color, and the third color to the compensation ratio determiner.

3. The display device of claim 1, further comprising a luminance calculator configured to sum the actual luminance ratios according of the first color, the second color, and the third color and to transmit the sum of the luminance ratios to the compensation ratio determiner.

4. The display device of claim 2, wherein the compensation ratio determiner determines the compensation ratio by determining a difference between a sum of the actual luminance ratios of the first color, the second color, and the third color and the sum of reference luminance ratios of the first color, the second color, and the third color.

5. The display device of claim 1, wherein the compensation ratio determiner determines the compensation ratio by determining a difference between actual luminance ratios of the first color, the second color, and the third color and reference luminance ratios according to grayscale data of the first color, the second color, and the third color, respectively.

6. The display device of claim 1, wherein the luminance information comprises luminance, color temperature, and color coordinate information corresponding to the first color, the second color, and the third color extracted from the test image.

7. A display device, comprising:

a display unit including a plurality of pixels to display images according to compensated image data signals;

a test data input section connected to a display unit to transmit a predetermined test image data signal to the display unit to display a test image;

a driving current measuring unit configured to receive driving current amounts by colors from the pixels of the display unit when display unit displays the test image;

a calculator configured to calculate actual luminance ratios of a first color, a second color, and a third color from the driving current amounts, and determine a sum of the actual luminance ratios;

a compensation ratio determiner configured to calculate a compensation ratio to compensate for color errors of the first color, the second color, and the third color from either the actual luminance ratios or the sum of the actual luminance ratios; and

a data compensator configured to generate the compensated image data signals by adjusting external input video signals according to the compensation ratio and to transmit the compensated image data signals to the display panel.

8. The display device of claim 7, further comprising a reference luminance memory configured to store a reference driving current corresponding to grayscale data signals of the first color, the second color and the third color, efficiency of luminance to currents by colors, reference luminance information including reference luminance ratios by colors and a sum of the reference luminance ratios by colors according to reference calculation results of the reference driving current and the efficiency of luminance to driving currents by colors, and to transmit the reference luminance information corresponding to grayscale data signals of the first color, the second color, and the third color to the compensation ratio determiner.

9. The display device of claim 7, wherein the compensation ratio determiner to determine the compensation ratio by determining a difference between the sum of the actual luminance ratios of the first color, the second color, and the third color acquired from the calculator and a sum of reference luminance ratios according to grayscale data of the first color, the second color, and the third color.

10. The display device of claim 8, wherein the compensation ratio determiner to determine the compensation ratio by determining a difference between the actual luminance ratios of the first color, the second color, and the third color and the reference luminance ratios according to grayscale data of the first color, the second color, and the third color, respectively.

11. A method of compensating color characteristics in a display device, comprising:

providing a display unit including a plurality of pixels to display images according to compensated image data signals;

transmitting a predetermined test image data signal to the pixels of the display unit;

receiving actual luminance information from the display unit displaying a test image according to the test image data signal;

determining actual luminance ratios of a first color, a second color, and a third color from the actual luminance information;

calculating a compensation ratio to compensate for color errors of the first color, the second color, and the third color from the actual luminance ratios of the first color, the second color, and the third color;

generating the compensated image data signals by compensating external input video signals using the compensation ratio; and

transmitting the compensated image data signals to the pixels of the display unit.

12. The method of claim 11, wherein the calculating the compensation ratio comprises determining a difference between a sum of the actual luminance ratios of the first color, the second color, and the third color and a sum of reference luminance ratios according to grayscale data of the first color, the second color, and the third color.

13. The method of claim 11, wherein the calculating of the compensation ratio comprises determining differences by colors between the actual luminance ratios of the first color, the second color, and the third color and reference luminance ratios according to grayscale data of the first color, the second color, and the third color, respectively.

14. The method of claim 11, further comprising storing reference luminance information prior to the calculating of the compensation ratio, the reference luminance information including a sum of reference luminance ratios according to grayscale data of the first color, the second color, and the third color, and reference luminance ratios with respect to the first color, the second color, and the third color.

15. The method of claim 11, wherein the determining of the actual luminance ratios comprises:

receiving driving current amounts by colors of the pixels of the display unit upon displaying the test image; and

calculating the actual luminance ratios of the first color, the second color, and the third color from the received driving current amounts.