Low power subpixel rendering on RGBW display

Patent metadata

Field	Value
Publication number	US-9418398-B2
Application number	US-201414304214-A
Country	US
Kind code	B2
Filing date	Jun 13, 2014
Priority date	Jun 12, 2014
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

An apparatus and method for providing low power subpixel rendering are provided. The method includes receiving image data for a first pixel of a captured image, receiving image data for a second pixel of the capture image, determining a first saturation value of the first pixel and a second saturation value of the second pixel, determining a maximum saturation value based on the first saturation value and the second saturation value, and rendering a subpixel value using a one dimensional filter or a unity filter based on the determined maximum saturation value.

First claim

What is claimed is:

1. A method for rendering a subpixel, the method comprising:
receiving image data for a first pixel of a captured image;
receiving image data for a second pixel of the capture image;
determining a first saturation value of the first pixel and a second saturation value of the second pixel;
determining a maximum saturation value based on the first saturation value and the second saturation value; and
rendering a subpixel value using a one dimensional filter or a unity filter based on the determined maximum saturation value.

2. The method of claim 1 , wherein the rendering of the subpixel values comprises using the one dimensional filter if the maximum saturation value is above a threshold and using the unity filter if the maximum saturation value is below the threshold.

3. The method of claim 1 , wherein the rendering of the subpixel comprises using a blended output of the one dimensional filter and the unity filter.

4. The method of claim 3 , wherein the blended output of the one dimensional filter and the unity filter varies based on the maximum saturation value.

5. The method of claim 3 , wherein the rendering of the subpixel comprises using the following equation:

A
=

A
i

+

(

A

i
+
1

-

A
i

2

)

*
sat

where A is the rendered value of the subpixel, A i is a color value of the first pixel, A i+1 is a color value of the second pixel, and sat is the determined maximum saturation.

6. The method of claim 3 , wherein the rendering of the subpixel comprises using the following equation:

A
=

A

i
-
1

+

(

A
i

-

A

i
-
1

2

)

*
sat

where A is the rendered value of the subpixel, A i is a color value of the first pixel, A i−1 is a color value of the second pixel, and sat is the determined maximum saturation.

7. The method of claim 6 , wherein the determined maximum saturation is based on a blue component of the image data for the first pixel and a blue component of the image data for the second pixel.

8. The method of claim 1 , wherein the determining of the first saturation value and the second saturation value comprises using the following equation:

sat
=

100
⁢
%

-

min
⁡

(

r
,
g
,
b

)

max
⁡

(

r
,
g
,
b

)

wherein r is a red value of the respective pixel, g is a green value of the respective pixel, and b is a blue value of the respective pixel.

9. The method of claim 8 , wherein the determining of the maximum saturation value comprises multiplying the saturation value by 2 and clipping the result to 100%.

10. The method of claim 1 , wherein the rendering of the subpixel comprises using the following equation:

A
=

(

A
i

+

A

i
+
1

2

)

+

(

A

i
+
1

-

A
i

2

)

*
inverse
⁢

⁢
sat

where A is the rendered value of the subpixel, A i is a color value of the first pixel, A i+1 is a color value of the second pixel, and inverse sat is determined as 100% minus the determined maximum saturation.

11. The method of claim 1 , wherein the rendering of the subpixel comprises using the following equation:

A
=

(

A

i
-
1

+

A

Assignees

• Samsung Electronics Co Ltd

Inventors

• Elliott Candice Hellen Brown
• Botzas Anthony
• Higgins Michel Francis

Classifications

• H04N25/585

  with pixels having different sensitivities within the sensor, e.g. fast or slow pixels or pixels having different sizes · CPC title

• H04N23/12

  with one sensor only · CPC title

• G06T2207/10024

  Color image · CPC title

• G06T7/408

  Physics · mapped topic

• 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