Display device and method of driving the same

Patent metadata

Field	Value
Publication number	US-10269285-B2
Application number	US-201615054661-A
Country	US
Kind code	B2
Filing date	Feb 26, 2016
Priority date	Sep 9, 2015
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A display device includes: a display unit; a plurality of pixels disposed in the display unit, each pixel including first and second blue sub-pixels; and a driving mode controller configured to set a driving mode to one of a first driving mode in which both of the first and second blue sub-pixels emit light, and a second driving mode in which one of the first and second blue sub-pixels emits light, wherein the first blue sub-pixel emits light of a first frequency, and the second blue sub-pixel emits light of a second frequency different from the first frequency.

First claim

What is claimed is:

1. A display device, comprising:
a display unit;
a plurality of pixels disposed in the display unit, each of the pixels comprising a red sub-pixel, a green sub-pixel, a first blue sub-pixel and a second blue sub-pixel;
a driving mode controller configured to set a driving mode to one of a first driving mode in which both of the first and second blue sub-pixels emit light, and a second driving mode in which one of the first and second blue sub-pixels emits light;
an output signal generator configured to receive two successive input image signals including first and second input image signals, and generate an output signal based on the two successive input image signals,
wherein the first blue sub-pixel emits light of a first frequency, and the second blue sub-pixel emits light of a second frequency different from the first frequency,
wherein the first input image signal includes a first red image signal, a first green image signal and a first blue image signal, and the second input image signal includes a second red image signal, a second green image signal and a second blue image signal, and
wherein the output signal includes an output red image signal corresponding to the red sub-pixel, an output green image signal corresponding to the green sub-pixel, a first output blue image signal corresponding to the first blue sub-pixel, and a second output blue image signal corresponding to the second blue sub-pixel,
wherein the second driving mode includes a (2-1)-th driving mode in which the first blue sub-pixel emits light, and when the driving mode is the (2-1)-th driving mode, the output signal generator generates the first output blue image signal based on the first and second blue image signals according to the following equation:

BO
⁢

⁢
1

=

255
×

(

(

BI
⁢

⁢
1

255

)

2.2

+

(

BI
⁢

⁢
2

255

)

2.2

2

)

1
2.2

,

wherein BO 1 is the first output blue image signal, BI 1 is the first blue image signal and BI 2 is the second blue image signal.

2. The device of claim 1 , wherein a central wavelength of the light emitted from the first blue sub-pixel is longer than a central wavelength of the light emitted from the second blue sub-pixel.

3. The device of claim 1 , wherein a central wavelength of the light emitted from the first blue sub-pixel is in a range from about 464 nm to about 470 nm, and a central wavelength of the light emitted from the second blue sub-pixel is in a range from about 440 nm to about 464 nm.

4. The device of claim 1 , wherein the second driving mode includes a (2-2)-th driving mode in which the second blue sub-pixel emits light.

5. The device of claim 4 , wherein the driving mode controller is configured to determine a current time as day or night, set the driving mode to one of the first driving mode and the (2-1)-th driving mode when the current time is day, and set the driving mode to the (2-2)-th driving mode when the current time is night.

6. The device of claim 4 , wherein the driving mode controller is configured to determine a current location as an outdoor space or an indoor space, set the driving mode to the first driving mode when the current location is the outdoor space, and set the driving mode to one of the (2-1)-th driving mode and the (2-2)-th driving mode when the current location is the indoor space.

7. The device of claim 4 , wherein the output signal generator:
generates the first and second output blue image signals to allow the first and second blue sub-pixels to emit light when the driving mode is the first driving mode, and
generates the second output blue image signal based on the first and second blue image signals to allow the second blue sub-pixel to emit light when the driving mode is the (2-2)-th driving mode.

8. The device of claim 7 , wherein the output signal generator:
generates the output red image signal based on the first and second red image signals,
generates the output green image signal based on the first and second green image signals,
when the driving mode is the first driving mode, generates the first output blue image signal same as the first blue image signal and the second output blue image signal same as the second blue image signal, and
when the driving mode is the (2-2)-th driving mode, generates the second output blue image signal based on the first and second blue image signals according to the following equation:

BO
⁢

⁢
1

=

255
×

(

(

BI
⁢

⁢
1

255

)

2.2

+

(

BI
⁢

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Changhoon
• Won Byeonghee
• Kim Ilnam
• Park Wonsang
• Baek Jongin

Classifications

• G09G3/2003

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title

• G09G2340/0457

  Improvement of perceived resolution by subpixel rendering · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G3/2044 Primary

  using dithering · CPC title