US 11,238,817 B2Granted

Method and apparatus for pixel signal conversion

AssigneeHkc Corporation Limited

InventorChih Tsung Kang

Life of this patent

Estimating the term…

Abstract

A method and an apparatus for pixel signal conversion are provided. The method includes: based on an initial first subpixel signal, an initial second subpixel signal, and an initial third subpixel signal of a pixel signal, obtaining a corresponding first stimulus value signal, second stimulus value signal, and third stimulus value signal. When converted pixel signals are applied to a hybrid-color display consisting of subpixels of four colors of W, R, G, and B, a display effect is closer to actual representation of original hybrid colors of R, G, and B, to alleviate a color shift defect of a large view angle.

Claims15

Dependent claims

A method for pixel signal conversion, the method comprising:

obtaining a pixel signal, wherein the pixel signal comprises an initial first subpixel signal, an initial second subpixel signal, and an initial third subpixel signal, and the pixel signal is configured to correspondingly drive a subpixel R, a subpixel G, and a subpixel B in a specific pixel unit;
obtaining first stimulus value signals of the initial first subpixel signal based on the initial
{
RX
=
(
R
/
T
)
^
γ
⁢
⁢
RX
RY
=
(
R
/
T
)
^
γ
⁢
⁢
RY
RZ
=
(
R
/
T
)
^
γ
⁢
⁢
RZ
,
first subpixel signal by a first formula of wherein the first stimulus value signals are at least one of a stimulus value signal RX, a stimulus value signal RY, or a stimulus value signal RZ;
obtaining second stimulus value signals of the initial second subpixel signal based on the
{
GX
=
(
G
/
T
)
^
γ
⁢
⁢
GX
GY
=
(
G
/
T
)
^
γ
⁢
⁢
GY
GZ
=
(
G
/
T
)
^
γ
⁢
⁢
GZ
,
initial second subpixel signal by a second formula of wherein the second stimulus value signals are at least one of a stimulus value signal GX, a stimulus value signal GY, or a stimulus value signal GZ;
□□ stimulus value signals of the initial third subpixel signal based on the
{
B
⁢
X
=
(
B
/
T
)
^
γ
⁢
⁢
BX
BY
=
(
B
/
T
)
^
γ
⁢
⁢
BY
BZ
=
(
B
/
T
)
^
γ
⁢
⁢
BZ
,
initial third subpixel signal by a third formula of wherein the third stimulus value signals are at least one of a stimulus value signal BX, a stimulus value signal BY, or a stimulus value signal BZ;
obtaining a fourth subpixel signal based on a minimum value in a set of stimulus value signals, wherein the set of stimulus value signals comprises a first stimulus value signal of the first stimulus value signals, a second stimulus value signal of the second stimulus value signals, and a third stimulus value signal of the third stimulus value signals;
and
using the initial first subpixel signal, the initial second subpixel signal, the initial third subpixel signal, and the fourth subpixel signal as converted pixel signals, wherein the converted pixel signals are configured to correspondingly drive the subpixel R, the subpixel G, the subpixel B, and a subpixel W in the specific pixel unit,
wherein:
RX is the stimulus value signal RX, RY is the stimulus value signal RY, RZ is the stimulus value signal RZ, and R is the initial first subpixel signal;
GX is the stimulus value signal GX, GY is the stimulus value signal GY, GZ is the stimulus value signal GZ, and G is the initial second subpixel signal;
BX is the stimulus value signal BX, BY is the stimulus value signal BY, BZ is the stimulus value signal BZ, and B is the initial third subpixel signal;
T is a maximum pixel signal value;
γRX, γRY, and γRZ are all stimulus value power functions of the initial first subpixel signal;
γGX, γGY, and γGZ are all stimulus value power functions of the initial second subpixel signal;
and
γBX, γBY and γBZ are all stimulus value power functions of the initial third subpixel signal.

132 more elements

A non-transitory computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to:

obtain a pixel signal, wherein the pixel signal comprises an initial first subpixel signal, an initial second subpixel signal, and an initial third subpixel signal, and the pixel signal is configured to correspondingly drive a subpixel R, a subpixel G, and a subpixel B in a specific pixel unit;
obtain first stimulus value signals of the initial first subpixel signal based on the initial first subpixel signal by a first formula of
{
RX
=
(
R
/
T
)
^
γ
⁢
⁢
RX
RY
=
(
R
/
T
)
^
γ
⁢
⁢
RY
RZ
=
(
R
/
T
)
^
γ
⁢
⁢
RZ
,
wherein the first stimulus value signals are at least one of a stimulus value signal RX, a stimulus value signal RY, or a stimulus value signal RZ;
obtain second stimulus value signals of the initial second subpixel signal based on the
{
GX
=
(
G
/
T
)
^
γ
⁢
⁢
GX
GY
=
(
G
/
T
)
^
γ
⁢
⁢
GY
GZ
=
(
G
/
T
)
^
γ
⁢
⁢
GZ
,
initial second subpixel signal by a second formula of wherein the second stimulus value signals are at least one of a stimulus value signal GX, a stimulus value signal GY, or a stimulus value signal GZ;
obtain third stimulus value signals of the initial third subpixel signal based on the initial
{
B
⁢
X
=
(
B
/
T
)
^
γ
⁢
⁢
BX
BY
=
(
B
/
T
)
^
γ
⁢
⁢
BY
BZ
=
(
B
/
T
)
^
γ
⁢
⁢
BZ
,
third subpixel signal by a third formula of wherein the third stimulus value signals are at least one of a stimulus value signal BX, a stimulus value signal BY, or a stimulus value signal BZ;
obtain a fourth subpixel signal based on a minimum value in a set of stimulus value signals, wherein the set of stimulus value signals comprises a first stimulus value signal of the first stimulus value signals, a second stimulus value signal of the second stimulus value signals, and a third stimulus value signal of the third stimulus value signals;
and
use the initial first subpixel signal, the initial second subpixel signal, the initial third subpixel signal, and the fourth subpixel signal as converted pixel signals, wherein the converted pixel signals are configured to correspondingly drive the subpixel R, the subpixel G, the subpixel B, and a subpixel W in the specific pixel unit,
wherein:
RX is the stimulus value signal RX, RY is the stimulus value signal RY, RZ is the stimulus value signal RZ, and R is the initial first subpixel signal;
GX is the stimulus value signal GX, GY is the stimulus value signal GY, GZ is the stimulus value signal GZ, and G is the initial second subpixel signal;
BX is the stimulus value signal BX, BY is the stimulus value signal BY, BZ is the stimulus value signal BZ, and B is the initial third subpixel signal;
T is a maximum pixel signal value;
γRX, γRY, and γRZ are all stimulus value power functions of the initial first subpixel signal;
γGX, γGY, and γGZ are all stimulus value power functions of the initial second subpixel signal;
and
γBX, γBY and γBZ are all stimulus value power functions of the initial third subpixel signal.

132 more elements

A computer device, comprising a memory and a processor, the memory storing a computer program, and when executing the computer program, the processor performing the following steps:

obtaining a pixel signal, wherein the pixel signal comprises an initial first subpixel signal, an initial second subpixel signal, and an initial third subpixel signal, and the pixel signal is configured to correspondingly drive a subpixel R, a subpixel G, and a subpixel B in a specific pixel unit;
obtaining first stimulus value signals of the initial first subpixel signal based on the initial
{
RX
=
RY
=
(
R
/
T
)
^
γ
⁢
RX
(
R
/
T
)
^
γ
⁢
RY
RZ
=
(
R
/
T
)
^
γ
⁢
RZ
,
first subpixel signal by a first formula of wherein the first stimulus value signals are at least one of a stimulus value signal RX, a stimulus value signal RY, or a stimulus value signal RZ;
obtaining second stimulus value signals of the initial second subpixel signal based on the
{
GX
=
GY
=
(
G
/
T
)
^
γ
⁢
GX
(
G
/
T
)
^
γ
⁢
GY
GZ
=
(
G
/
T
)
^
γ
⁢
GZ
,
initial second subpixel signal by a second formula of wherein the second stimulus value signals are at least one of a stimulus value signal GX, a stimulus value signal GY, or a stimulus value signal GZ;
obtaining third stimulus value signals of the initial third subpixel signal based on the
{
BX
=
BY
=
(
B
/
T
)
^
γ
⁢
BX
(
B
/
T
)
^
γ
⁢
BY
BZ
=
(
B
/
T
)
^
γ
⁢
BZ
,
initial third subpixel signal by a third formula of wherein the third stimulus value signals are at least one of a stimulus value signal BX, a stimulus value signal BY, or a stimulus value signal BZ;
obtaining a fourth subpixel signal based on a minimum value in a set of stimulus value signals, wherein the set of stimulus value signals comprises a first stimulus value signal of the first stimulus value signals, a second stimulus value signal of the second stimulus value signals, and a third stimulus value signal of the third stimulus value signals;
and
using the initial first subpixel signal, the initial second subpixel signal, the initial third subpixel signal, and the fourth subpixel signal as converted pixel signals, wherein the converted pixel signals are configured to correspondingly drive the subpixel R, the subpixel G, the subpixel B, and a subpixel W in the specific pixel unit,
wherein:
RX is the stimulus value signal RX, RY is the stimulus value signal RY, RZ is the stimulus value signal RZ, and R is the initial first subpixel signal;
GX is the stimulus value signal GX, GY is the stimulus value signal GY, GZ is the stimulus value signal GZ, and G is the initial second subpixel signal;
BX is the stimulus value signal BX, BY is the stimulus value signal BY, BZ is the stimulus value signal BZ, and B is the initial third subpixel signal;
T is a maximum pixel signal value;
γRX, γRY, and γRZ are all stimulus value power functions of the initial first subpixel signal;
γGX, γGY, and γGZ are all stimulus value power functions of the initial second subpixel signal;
and
γBX, γBY and γBZ are all stimulus value power functions of the initial third subpixel signal.

121 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/043,305Filed 19 Nov 2018
Priority: CN 201811320170.27 Nov 2018
Published: US 2021/0256922 A119 Aug 2021
Granted: 1 Feb 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G09G 3/3413
Control of illumination source: details of control of colour illumination sources
G09G 3/3607
Using liquid crystals: for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
G09G 2300/0452
Pixel structures: details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
G09G 2320/0242
Improving the quality of display appearance: compensation of deficiencies in the appearance of colours

Family

US 2021/0256922 A1Pre-grant publication · published 19 Aug 2021
US 11,238,817 B2This patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

A method for pixel signal conversion, the method comprising:

obtaining a pixel signal, wherein the pixel signal comprises an initial first subpixel signal, an initial second subpixel signal, and an initial third subpixel signal, and the pixel signal is configured to correspondingly drive a subpixel R, a subpixel G, and a subpixel B in a specific pixel unit;
obtaining first stimulus value signals of the initial first subpixel signal based on the initial
{
RX
=
(
R
/
T
)
^
γ
⁢
⁢
RX
RY
=
(
R
/
T
)
^
γ
⁢
⁢
RY
RZ
=
(
R
/
T
)
^
γ
⁢
⁢
RZ
,
first subpixel signal by a first formula of wherein the first stimulus value signals are at least one of a stimulus value signal RX, a stimulus value signal RY, or a stimulus value signal RZ;
obtaining second stimulus value signals of the initial second subpixel signal based on the
{
GX
=
(
G
/
T
)
^
γ
⁢
⁢
GX
GY
=
(
G
/
T
)
^
γ
⁢
⁢
GY
GZ
=
(
G
/
T
)
^
γ
⁢
⁢
GZ
,
initial second subpixel signal by a second formula of wherein the second stimulus value signals are at least one of a stimulus value signal GX, a stimulus value signal GY, or a stimulus value signal GZ;
□□ stimulus value signals of the initial third subpixel signal based on the
{
B
⁢
X
=
(
B
/
T
)
^
γ
⁢
⁢
BX
BY
=
(
B
/
T
)
^
γ
⁢
⁢
BY
BZ
=
(
B
/
T
)
^
γ
⁢
⁢
BZ
,
initial third subpixel signal by a third formula of wherein the third stimulus value signals are at least one of a stimulus value signal BX, a stimulus value signal BY, or a stimulus value signal BZ;
obtaining a fourth subpixel signal based on a minimum value in a set of stimulus value signals, wherein the set of stimulus value signals comprises a first stimulus value signal of the first stimulus value signals, a second stimulus value signal of the second stimulus value signals, and a third stimulus value signal of the third stimulus value signals;
and
using the initial first subpixel signal, the initial second subpixel signal, the initial third subpixel signal, and the fourth subpixel signal as converted pixel signals, wherein the converted pixel signals are configured to correspondingly drive the subpixel R, the subpixel G, the subpixel B, and a subpixel W in the specific pixel unit,
wherein:
RX is the stimulus value signal RX, RY is the stimulus value signal RY, RZ is the stimulus value signal RZ, and R is the initial first subpixel signal;
GX is the stimulus value signal GX, GY is the stimulus value signal GY, GZ is the stimulus value signal GZ, and G is the initial second subpixel signal;
BX is the stimulus value signal BX, BY is the stimulus value signal BY, BZ is the stimulus value signal BZ, and B is the initial third subpixel signal;
T is a maximum pixel signal value;
γRX, γRY, and γRZ are all stimulus value power functions of the initial first subpixel signal;
γGX, γGY, and γGZ are all stimulus value power functions of the initial second subpixel signal;
and
γBX, γBY and γBZ are all stimulus value power functions of the initial third subpixel signal.

132 more elements

Facts

Application

17/043,305Filed 19 Nov 2018

Priority

CN 201811320170.27 Nov 2018

Published

US 2021/0256922 A119 Aug 2021

Granted

1 Feb 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

G09G 3/3413
Control of illumination source: details of control of colour illumination sources
G09G 3/3607
Using liquid crystals: for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
G09G 2300/0452
Pixel structures: details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
G09G 2320/0242
Improving the quality of display appearance: compensation of deficiencies in the appearance of colours