Converting system and converting method of three-color data to four-color data

Patent metadata

Field	Value
Publication number	US-2016365016-A1
Application number	US-201414425315-A
Country	US
Kind code	A1
Filing date	Nov 7, 2014
Priority date	Nov 4, 2014
Publication date	Dec 15, 2016
Grant date	—

Abstract

A converting system and a converting method of three-color data to four-color data are provided. The converting system includes: a first calculating part configured to calculate a saturation value and a luminance enhancement coefficient according to inputted RGB values, a second calculating part configured to calculate luminance-enhanced RGB values according to the luminance enhancement coefficient and the inputted RGB values, a white determining part configured to use a minimum value of the luminance-enhanced RGB values as an outputted W value, and a three-color determining part configured to calculate outputted RGB values according to the luminance-enhanced RGB values and the outputted W value. The invention can obtain optimal outputted W values for different inputted RGB values and maximally increase the transmittance of the display apparatus. Accordingly, the display apparatus can increase the saturation of display image while enhance the transmittance.

First claim

What is claimed is:

1 . A converting system of three-color data to four-color data, comprising:
a first calculating part, configured to calculate a saturation value and a luminance enhancement coefficient according to inputted RGB values; a second calculating part, configured to calculate luminance-enhanced RGB values according to the luminance enhancement coefficient and the inputted RGB values; a white determining part, configured to use a minimum value of the luminance-enhanced RGB values as an outputted W value; a three-color determining part, configured to calculate outputted RGB values according to the luminance-enhanced RGB values and the outputted W value.

2 . The converting system according to claim 1 , wherein the first calculating part further is configured to use an expression [1] to calculate the saturation value and the luminance enhancement coefficient, and the expression [1] is that:

s
=

1
-

3
×

Min


(

r
,
g
,
b

)

r
+
g
+
b

,

K
=

1
+

(

K
0

-
1

)

×

(

1
-
s

)

,

K
0

=

L



2


/


L



1

where s represents the saturation value, r represents the inputted R value, g represents the inputted G value, b represents the inputted B value, Min(r, g, b) represents a minimum value of r, g and b, K represents the luminance enhancement coefficient, L 1 represents a maximum luminance value corresponding to the inputted RGB values, L 2 represents a maximum luminance value corresponding to the outputted WRGB values.

3 . The converting system according to claim 1 , wherein the first calculating part further is configured to use an expression [2] to calculate the saturation value and the luminance enhancement coefficient, and the expression [2] is that:

s
=

1
-

Min


(

r
,
g
,
b

)

Max


(

r
,
g
,
b

)

,

K
=

1
+

(

K
0

-
1

)

×

(

1
-
s

)

,

K
0

=

L



2


/


L



1

where s represents the saturation value, r represents the inputted R value, g represents the inputted G value, b represents the inputted B value, Min(r, g, b) represents a minimum value of r, g and b, Max(r, g, b) represents a maximum value of r, g and b, K represents the luminance enhancement coefficient, L 1 represents a maximum luminance value corresponding to the inputted RGB values, L 2 represents a maximum luminance value corresponding to the outputted WRGB values.

4 . The converting system according to claim 1 , wherein the second calculating part further is configured to use an expression [3] to calculate the luminance-enhanced RGB values, and the expression [3] is that:

R
1

=

K

1
γ

×
r

,

G
1

=

K

1
γ

×
g

Assignees

• Shenzhen China Star Optoelect

Inventors

• Wu Jinjun

Classifications

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G2340/06

  Colour space transformation · CPC title

• G09G5/02

  characterised by the way in which colour is displayed {(details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607)} · CPC title

• G09G3/3225

  using an active matrix · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title