Sub-pixel rendering of a multiprimary image
View Patent ↗Methods and systems for displaying an image on a display, for example, a liquid crystal display (LCD) having more than three different colored filters. The display may include a plurality of sub-pixels, each of the sub-pixels being aligned with a filter having a color selected from a set of more than three different colors, none of which is white. A number of methods and systems for processing data for display are disclosed, for example, using data points from adjacent pixel groups, or data points for different colors within the same pixel data set.
1. A method of displaying an image on a color display comprising a liquid crystal (LC) array having a plurality of sub-pixels, the color display further comprising a plurality of color filters including a number N of different non-white colors, wherein N is greater than three, each of said sub-pixels of the LC array being aligned with a corresponding color filter, the method comprising:
receiving a plurality of three-color data sets, each including exactly three data points;
converting the three-color data sets using a conversion algorithm to obtain a respective plurality of multiprimary pixel data sets, each having N data points;
associating said multiprimary pixel data sets with respective pixel groups in the display, each pixel group comprising exactly three adjacent sub-pixels; and
for at least one sub-pixel in each said pixel group, providing an intensity value for the sub-pixel based at least on a first data point in the corresponding multiprimary pixel data set corresponding to the color of the filter aligned with said sub-pixel, and a second data point included in a multiprimary data set associated with an adjacent pixel group corresponding to the color of the filter aligned with the sub-pixel and corresponding to a color not present among the filters aligned with sub-pixels in the adjacent pixel group.
2. The method of claim 1 , wherein said providing an intensity value is further based on a third data point, said third data point being an intensity value in the multiprimary pixel data set corresponding to a color not represented in the corresponding pixel group.
3. A color display system comprising:
a display comprising a liquid crystal (LC) array having a plurality of sub-pixels, the color display further comprising a plurality of color filters including a number N of different non-white colors, wherein N is greater than three, each said sub-pixel of the LC array being aligned with a corresponding color filter, none of said colors being white;
a data converter to convert a plurality of first data sets having exactly three data points to a respective plurality of second data sets having N data points and corresponding to respective pixel groups, each pixel group comprising exactly three adjacent sub-pixels; and
a scaling processor to calculate for at least one sub-pixel in each said pixel group an intensity value based at least on a first data point in a first one of said second data sets corresponding to the color of said sub-pixel and a second data point in a second one of said second data sets associated with an adjacent pixel group, said second data point corresponding to the color of said sub-pixel, wherein said different color is not among the filters aligned with any of the sub-pixels in the adjacent pixel group.
4. The system of claim 3 , further comprising a timing controller to provide said intensity values to sub-pixels.
5. The system of claim 3 , wherein said liquid crystal elements are controlled by thin film transistors.
6. The color display system of claim 3 , wherein said scaling processor is to calculate said intensity value based on a third data point, said third data point being an intensity value in the first one of said second data sets corresponding to a color not represented in the corresponding pixel group.