Display apparatus and method of displaying an image using the same

• US 9,818,349 B2
• Filed: 05/07/2014
• Issued: 11/14/2017
• Est. Priority Date: 11/27/2013
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Won, Byeong-Hee, Mok, Rang-Kyun, Baek, Jong-In
• Primary Examiner(s): LAMB, CHRISTOPHER RAY
• Application Number:
  US14/271,736
• Publication Number:
  US 20150145895A1
• Time in Patent Office: 1,287 Days
• Field of Search: None
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2380/08 Biomedical applications
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

A display apparatus includes a display panel, an illumination part, an illumination controller, a luminance compensation part and a data driver. The display panel includes data lines, and is configured to display an image in a first direction. The illumination part is configured to emit illumination light having a first color in a second direction opposite to the first direction. The illumination controller is configured to control the illumination part and output an illumination signal corresponding to an intensity of the illumination light. The luminance compensation part is configured to compensate luminance of an input image data based on the illumination signal to output a data signal, and the data driver is configured to generate a data voltage based on the data signal, and output the data voltage to the data lines.

Claims

1. A display apparatus comprising:

a display panel comprising data lines, and configured to display an image in a first direction;

an illumination part configured to emit illumination light having a first color in a second direction opposite to the first direction;

an illumination controller configured to control the illumination part and output an illumination signal corresponding directly to an intensity of the illumination light emitted from the illumination part;

a luminance compensation part configured to compensate luminance of an input image data based on the illumination signal to output a data signal; and

a data driver configured to generate a data voltage based on the data signal, and output the data voltage to the data lines,

wherein

the luminance compensation part decreases luminance of one color of the image data of a plurality of colors of the image data based on the illumination signal, and

the illumination signal is based only on a number of light sources of the illumination part that are in a turn-on state or based directly on the voltage provided to the illumination part.

2. The display apparatus of claim 1, wherein

the input image data comprises red image data, green image data and blue image data, and

the luminance compensation part decreases luminance of the blue image data based on the illumination signal.

3. The display apparatus of claim 2, wherein the luminance compensation part comprises a first look-up table comprising values of a luminance decrease rate of the blue image data corresponding to the illumination signal.

4. The display apparatus of claim 1, wherein

the input image data comprises red image data, green image data and blue image data, and

the luminance compensation part decreases luminance of the blue image data and the green image data, and increases luminance of the red image data, based on the illumination signal.

5. The display apparatus of claim 4, wherein the luminance compensation part comprises:

a first look-up table comprising values of a luminance decrease rate of the blue image data corresponding to the illumination signal;

a second look-up table comprising values of a luminance decrease rate of the green image data corresponding to the illumination signal; and

a third look-up table comprising values of a luminance increase rate of the red image data corresponding to the illumination signal.

6. The display apparatus of claim 4, wherein

a luminance decrease rate of the blue image data corresponds to a grayscale level of the blue image data,

a luminance decrease rate of the green image data corresponds to a grayscale level of the green image data, and

a luminance increase rate of the red image data corresponds to a grayscale level of the red image data.

7. The display apparatus of claim 1, wherein the intensity of the illumination light in a wavelength range of about 500 nanometers to about 800 nanometers is greater than the intensity of the illumination light in a wavelength range of about 380 nanometers to about 500 nanometers.

8. The display apparatus of claim 7, wherein the intensity of the illumination light at a wavelength in the wavelength range of about 500 nanometers to about 800 nanometers increases, as the wavelength increases.

9. The display apparatus of claim 1, wherein

the illumination part comprises a plurality of light sources configured to generate the illumination light, and

the illumination controller outputs the illumination signal based on how many of the light sources are in a turn-on state.

10. The display apparatus of claim 1, further comprising:

a backlight assembly which is configured to provide light to the display panel,

wherein

the illumination part emits the illumination light using the light emitted by the backlight assembly, and

the illumination signal corresponds to an intensity of the light emitted by the backlight assembly.

11. The display apparatus of claim 10, further comprising:

a light guide part which is configured to guide the light emitted by the backlight assembly to the illumination part,

wherein the illumination part comprises an optical film which is configured to convert the light emitted by the backlight assembly into the illumination light.

12. The display apparatus of claim 1, further comprising:

a bezel which covers outer edges of the display panel,

wherein the bezel comprises a transparent material.

13. A method of displaying an image using a display apparatus, the method comprising:

emitting illumination light having a first color from a second surface of the display apparatus to an external background, wherein the second surface is opposite to a first surface of the display apparatus on which the image is displayed;

outputting an illumination signal corresponding directly to an intensity of the illumination light emitted from the second surface of the display apparatus; and

compensating luminance of an input image data, which comprises decreasing luminance of one color of the image data of a plurality of colors of the image data based on the illumination signal,

wherein the illumination signal is based only on a number of light sources of the illumination part that are in a turn-on state or based directly on the voltage provided to the illumination part.

14. The method of claim 13, wherein

the input image data comprises red image data, green image data and blue image data, and

the compensating the luminance of the input image data comprises decreasing luminance of the blue image data based on the illumination signal.

15. The method of claim 14, wherein

the intensity of the illumination light in a wavelength range of about 500 nanometers to about 800 nanometers is greater than the intensity of the illumination light in a wavelength range of about 380 nanometers to about 500 nanometers, and

the intensity of the illumination light at a wavelength in the wavelength range of about 500 nanometers to about 800 nanometers increases, as the wavelength increases.

16. The method of claim 14, wherein the compensating the luminance of the input image data comprises:

decreasing luminance of the green image data based on the illumination signal, and

increasing luminance of the red image data based on the illumination signal.

17. The method of claim 13, wherein the emitting the illumination light having the first color comprises using an illumination part, wherein the illumination part comprises a light source configured to generate the illumination light.

18. The method of claim 13, wherein

the emitting the illumination light having the first color comprises using an illumination part, which emits the illumination light using light emitted by a backlight assembly of the display apparatus,

wherein the backlight assembly is configured to provide the light to a display panel.