Display device and driving method thereof with improved luminance

• US 20090244387A1
• Filed: 01/14/2009
• Published: 10/01/2009
• Est. Priority Date: 03/31/2008
• Status: Abandoned Application

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Chang-Hoon, Lee, Jae-Sung
• Application Number:
  US12/320,010
• Publication Number:
  US 20090244387A1
• Time in Patent Office: Days
• US Class Current: 348/674
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H04N 13/315 the parallax barriers being time-variant
• CPC Class Codes: H04N 13/324 Colour aspects
• CPC Class Codes: H04N 13/359 Switching between monoscopic and stereoscopic modes
• CPC Class Codes: H04N 9/69 for modifying the colour signals by gamma correction controlling camera response for colour signals H04N23/83

Abstract

A display device and a driving method thereof in which if an input 2D/3D video signal is a 2D video signal, an image data signal is generated by applying a first gamma correction curved line. If the input 2D/3D video signal is a 3D video signal, an image data signal is generated by applying the second gamma correction curved line. Luminance of a maximum grayscale of the first gamma correction curved line is set to be lower than luminance of a maximum grayscale of the second gamma correction curved line. Therefore, it is possible to prevent luminance of the display device from deteriorating by a barrier in a 3D driving mode.

Claims

1. A display device comprising:

a plurality of first and second pixels;

a barrier for forming a transparent region and a non-transparent region for transmitting images of the plurality of first and second pixels in a first mode and for causing an image of the plurality of first pixels and an image of the plurality of second pixels to be observed at different points; and

a controller for determining one of the first mode and the second mode according to a video signal and generating image data by gamma-correcting the video signal according to the determined mode,

wherein the controller sets up a first luminance of image data generated by gamma-correcting the video signal of a maximum grayscale in the first mode to be different from a second luminance of image data generated by gamma-correcting the video signal in the second mode.

2. The display device of claim 1, wherein the second luminance is higher than the first luminance.

3. The display device of claim 2, wherein the second luminance is twice that of the first luminance.

4. The display deice of claim 1, wherein the controller gamma-corrects the video signal using a first gamma correction curved line in the first mode and gamma-corrects the video signal using a second gamma correction curved line in the second mode where the second gamma correction curved line is different from the first gamma correction curved line.

5. The display device of claim 4, wherein a maximum grayscale of image data transformed by the second gamma correction curved line is higher than a maximum grayscale of image data transformed by the first gamma correction curved line.

6. The display device of claim 4, wherein the controller stores the first and second gamma correction curved lines in a form of a lookup table.

7. The display device of claim 4, further comprising a data driver for transferring a signal corresponding to the image data from the controller to the plurality of first and second pixels,

wherein the data driver sets a range of the data signal in the second mode to be wider than a range of the data signal in the first mode.

8. The display device of claim 4, wherein the video signal includes at least one of a first video signal corresponding to a first color and a second video signal corresponding to a second color, and

the controller sets the second gamma correction curved line applied to the first video signal differently from the second gamma correction curved line applied to the second video signal.

9. The display device of claim 1, wherein the first mode is a 2-dimensional (2D) driving mode and the second mode is a 3-dimensional (3D) driving mode.

10. A method for driving a display device including a display unit having a plurality of first and second pixels and a barrier for selectively forming a transparent region and a non-transparent region for transmitting or not transmitting images displayed on the display unit, comprising:

determining one of a first mode and a second mode according to an input video signal;

generating first image data by forming the barrier as a transparent region and gamma-correcting the video signal when the first mode is determined; and

generating second image data by forming the barrier as a transparent region and a non-transparent region to cause an image of the plurality of first pixels and an image of the plurality of second pixels to be observed from different points and gamma-correcting the video signal when the second mode is determined,

wherein a first luminance of a maximum grayscale of the first image data is different from a second luminance of a maximum grayscale of the second image data.

11. The method of claim 10, wherein the second luminance is higher than the first luminance.

12. The method of claim 11, wherein the second luminance is twice that of the first luminance.

13. The method of claim 10, wherein

the video signal includes at least one of a first video signal corresponding to a first color and a second video signal corresponding to a second color, and

in the generating of the second image data, the first video signal and the second video signal are gamma corrected to be different from each other.

14. The method of claim 10, wherein the first mode is a 2-dimensional (2D) mode and the second mode is a 3-dimensional (3D) mode.

15. The method of claim 10, further comprising:

transforming the first image data to a first data signal and transferring the first data signal to the display unit; and

transforming the second image data to a second data signal and transferring the second data signal to the display unit,

wherein a range of the second data signal is set to be wider than a range of the first data signal.

16. A method for driving a display device, comprising the steps of:

generating a first image data signal by applying a first gamma correction curved line when a 2-dimensional video signal is input;

generating a second image data signal by applying a second gamma correction curved line when a 3-dimensional video signal is input; and

maintaining a luminance level of said second image data signal to equal of that of said first image data signal,

wherein a luminance level of a maximum grayscale of the first gamma correction curved line is set lower than a luminance level of a maximum grayscale of the second gamma correction curved line.