Display device

Patent metadata

Field	Value
Publication number	US-9734772-B2
Application number	US-201514695072-A
Country	US
Kind code	B2
Filing date	Apr 24, 2015
Priority date	May 15, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A display device includes: a display unit including pixels arranged in a matrix therein, each of the pixels including a first sub-pixel that displays a first color component, a second sub-pixel that displays a second color component, a third sub-pixel that displays a third color component, and a fourth sub-pixel that displays a fourth color component; and a signal processing unit that receives input signals that are capable of being displayed with the first sub-pixel, the second sub-pixel, and the third sub-pixel, and calculates output signals to the first, second, third, and fourth sub-pixels. The signal processing unit generates converted input signals with changed saturation among the input signals. The signal processing unit calculates output signals to the first sub-pixel, the second sub-pixel, and the third sub-pixel based on the converted input signals and an amount of increase in brightness caused by the fourth sub-pixel.

First claim

What is claimed is:

1. A display device comprising:
a display unit including pixels arranged in a matrix therein, each of the pixels including,
a first sub-pixel that displays a first color component,
a second sub-pixel that displays a second color component,
a third sub-pixel that displays a third color component, and
a fourth sub-pixel that displays a fourth color component different from the first sub-pixel, the second sub-pixel, and the third sub-pixel; and

a signal processing unit that receives input signals that are capable of being displayed with the first sub-pixel, the second sub-pixel, and the third sub-pixel, and calculates output signals to the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel, wherein
the signal processing unit generates converted input signals with changed saturation among the input signals, the converted input signals being obtained by multiplying a saturation S of the input signals, which is given by the following expression (1), by a gain value Sgain, which is given by the following expression (2):
S =(Max−Min)/Max  (1),

S gain=( S param−1)×Min+1  (2)

where a maximum value of the brightness of the input signals is denoted as Max, a minimum value of the brightness of the input signals is denoted as Min, and a set value Sparam is given such that 0≦Sparam<1, and
the signal processing unit calculates output signals to the first sub-pixel, the second sub-pixel, and the third sub-pixel based on the converted input signals and an amount of increase in brightness caused by the fourth sub-pixel.

2. A display device comprising:
a display unit including pixels arranged in a matrix therein, each of the pixels including,
a first sub-pixel that displays a first color component,
a second sub-pixel that displays a second color component,
a third sub-pixel that displays a third color component, and
a fourth sub-pixel that displays a fourth color component different from the first sub-pixel, the second sub-pixel, and the third sub-pixel; and

a signal processing unit that receives input signals that are capable of being displayed with the first sub-pixel, the second sub-pixel, and the third sub-pixel, and calculates output signals to the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel, wherein
the signal processing unit generates converted input signals with changed saturation among the input signals, the converted input signals being obtained by multiplying a saturation S of the input signals, which is given by the following expression (1), by a gain value Sgain, which is given by the following expression (2):
S =(Max−Min)/Max  (1),

S gain= S param−[1−(Max−Min)]  (2),

where a maximum value of the brightness of the input signals is denoted as Max, a minimum value of the brightness of the input signals is denoted as Min, and a set value Sparam is given such that 0≦Sparam<1, and
the signal processing unit calculates output signals to the first sub-pixel, the second sub-pixel, and the third sub-pixel based on the converted input signals and an amount of increase in brightness caused by the fourth sub-pixel.

3. A display device comprising:
a display unit including pixels arranged in a matrix therein, each of the pixels including,
a first sub-pixel that displays a first color component,
a second sub-pixel that displays a second color component,
a third sub-pixel that displays a third color component, and
a fourth sub-pixel that displays a fourth color component different from the first sub-pixel, pixel, the second sub-pixel, and the third sub-pixel; and

a signal processing unit that receives input signals that are capable of being displayed with the first sub-pixel, the second sub-pixel, and the third sub-pixel, and calculates output signals to the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel, wherein
the signal processing unit generates converted input signals with changed saturation among the input signals, the converted input signals being obtained by multiplying a saturation S of the input signals, which is given by the following expression (1), by a gain value Sgain, which is given by the following expression (2):
S =(Max−Min)/Max  (1),

S gain=( S param−1)×Min+1  (2),

where a minimum value of the brightness of the input signals is denoted as Min and a set value Sparam is given such that 1<Sparam, and
the signal processing unit calculates output signals to the first sub-pixel, the second sub-pixel, and the third sub-pixel based on the converted input signals and an amount of increase in brightness caused by the fourth sub-pixel.

4. A display device comprising:
a display unit including pixels arranged in a matrix therein, each of the pixels including,
a first sub-pixel that displays a first color component,
a second sub-pixel that displays a second color component,
a third sub-pixel that displays a third color component, and
a fourth sub-pixel that displays a fourth color component different from the first sub-pixel, the second sub-pixel, and the third sub-pixel; and

a signal processing unit that receives input signals that are capable of being displayed with the first sub-pixel, the second sub-pixel, and the third sub-pixel, and calculates output signals to the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel, wherein
the signal processing unit generates converted input signals with changed saturation among the input signals, the converted input signals being obtained by multiplying a saturation S of the input signals, which is given by the following expression (1), by a gain value Sgain, which is given by the following expression (2):
S =(Max−Min)/Max  (1),

S gain= S param−[1−(Max−Min)]  (2),

where a maximum value of the brightness of the input signals is denoted as Max, a minimum value of the brightness of the input signals is denoted as Min, and a set value Sparam is given such that 1<Sparam, and
the signal processing unit calculates output signals to the first sub-pixel, the second sub-pixel, and the third sub-pixel based on the converted input signals and an amount of increase in brightness caused by the fourth sub-pixel.

Assignees

• Japan Display Inc

Inventors

• Mitsui Masashi
• Nagatsuma Toshiyuki

Classifications

• G09G2300/0452

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

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G3/2081

  with combination of amplitude modulation and time modulation (space and time error diffusion G09G3/2066) · CPC title

• G09G3/3648

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G09G2340/06

  Colour space transformation · CPC title