Conversion of a sub-pixel format data

• US 8,223,168 B2
• Filed: 02/04/2011
• Issued: 07/17/2012
• Est. Priority Date: 05/09/2001
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Brown Elliott, Candice Hellen, Higgins, Michael Francis
• Primary Examiner(s): Caschera, Antonio A
• Application Number:
  US13/021,521
• Publication Number:
  US 20110141131A1
• Time in Patent Office: 529 Days
• Field of Search: None
• US Class Current: 345/613
• CPC Class Codes: G06T 3/4015 Image demosaicing, e.g. colour filter arrays [CFA] or Bayer patterns
• CPC Class Codes: G06T 3/4069 by subpixel displacements
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/0414 Vertical resolution change
• CPC Class Codes: G09G 2340/0421 Horizontal resolution change
• CPC Class Codes: G09G 2340/0457 Improvement of perceived resolution by subpixel rendering
• CPC Class Codes: G09G 2340/0492 Change of orientation of the displayed image, e.g. upside-down, mirrored
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04
• CPC Class Codes: G09G 5/02 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

Abstract

A method of determining implied sample areas for each data point of each color in a source pixel data specified in a first sub-pixel format is used for sub-pixel rendering an image on a display specified in a second sub-pixel format. Each of the first and second sub-pixel formats comprises a plurality of colored sub-pixels. The method comprises determining a geometric center of each colored sub-pixel of the first format to define a sampling point; and defining each implied sample area by forming lines that are substantially equidistant between the sampling point of one colored sub-pixel and the sampling point of another neighboring same color colored sub-pixel. A similar technique may be used for determining resample areas for computing color values for rendering an image specified in a first sub-pixel format on a display substantially comprising a plurality of colored sub-pixels arranged in a second sub-pixel format.

Claims

1. A method of converting source pixel data signals corresponding to a first spatial distribution format of differently colored source subpixels of a respective, potentially renderable source image to output pixel data signals corresponding to a different second spatial distribution format of differently colored output subpixels of a respective renderable output image, wherein the source pixel data signals and the output pixel data signals are physical real signals, the method being implemented by an automated machine and comprising:

implicitly assigning implied source sample areas to the source subpixels of the first format and implicitly assigning to each implied source sample area a data value corresponding to an implied luminance output from the corresponding subpixel of said first format in accordance with said source pixel data, the implied luminance output being that of the potentially renderable source image if the source image is actually rendered;

implicitly assigning implied resample areas to the output subpixels of the second format in accordance with the spatial distribution of the output subpixels as defined by the second format;

for each color plane, implicitly overlaying a scaled or not scaled version, as indicated by a supplied overlay scaling ratio, of the implied source sample areas of the corresponding color over the implied resample areas of the same corresponding color;

in accordance with said implicit overlaying of the source sample areas over the output resample areas per the supplied overlay scaling ratio, automatically selecting in said automated machine, respective contribution weighting parameters to be applied to the assigned data values of the source sample areas of each color plane for purpose of generating area overlap related drive signals for each color plane;

for each output resample area of a given color plane, multiplying in said automated machine, the data values of implicitly overlying and contributing source sample areas by their respectively selected contribution weighting parameter and adding to one another the weighted data values to thereby define and generate in said automated machine, a respective output pixel data signal for each said resample area, the generated output pixel data signal being a physical real signal.

2. The method of claim 1 wherein said automatically selectable weighting parameters are defined within display driving hardware.

3. The method of claim 1 wherein said automatically selectable weighting parameters are defined within display driving software.

4. The method of claim 1 wherein said automatically selectable weighting parameters are defined within display driving firmware.

5. The method of claim 1 and further comprising driving a color display having subpixels organized according to said second format with said defined output pixel data signals.

6. The method of claim 1 and further comprising storing said defined output pixel data signals.

7. The method of claim 1 and further comprising transmitting said defined output pixel data signals.

8. The method of claim 1 wherein said first and second formats each include blue subpixels but the second format has one-half as many blue subpixels distributed across corresponding rows or columns thereof as does the first format for corresponding rows or columns of said first format.

9. The method of claim 1 and further comprising

using said defined output pixel data signals to drive a display selected from the group consisting of:

liquid crystal displays, subtractive displays, OLEDs, electrophoretic displays, field emitter displays, discrete light emitting diode displays, plasma panel displays, EL displays, projectors, and cathode ray tube displays.