US 12,334,029 B2
Color displays configured to convert RGB image data for display on advanced color electronic paper
Kenneth R. Crounse, Somerville, MA (US)
Assigned to E Ink Corporation, Billerica, MA (US)
Filed by E INK CORPORATION, Billerica, MA (US)
Filed on Mar. 28, 2024, as Appl. No. 18/620,049.
Application 18/620,049 is a continuation of application No. 18/138,791, filed on Apr. 25, 2023, granted, now 11,984,088.
Claims priority of provisional application 63/335,677, filed on Apr. 27, 2022.
Prior Publication US 2024/0242685 A1, Jul. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G09G 3/34 (2006.01); G02F 1/167 (2019.01); G09G 3/20 (2006.01)
CPC G09G 3/344 (2013.01) [G09G 3/2096 (2013.01); G09G 2320/0285 (2013.01); G09G 2320/041 (2013.01); G09G 2320/0666 (2013.01); G09G 2340/06 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A color display comprising:
an electrophoretic display comprising a front light, a light-transmissive electrode, an active matrix of pixel electrodes, and an electrophoretic medium comprising four types of electrophoretic particles, the electrophoretic medium being disposed between the light-transmissive electrode and the active matrix of pixel electrodes, the electrophoretic display being capable of producing eight primary colors at each pixel electrode;
non-transitory memory for storing look up tables mapping RGB (red, green, blue) colors to colors produced by the electrophoretic display;
a processor coupled to the non-transitory memory;
a controller coupled to the processor, and configured to provide electrophoretic display pixel color instructions to the active matrix of pixel electrodes;
wherein the processor is configured to perform the following steps:
receive RGB image data for each pixel in an image from the non-transitory memory;
convert the RGB image data for each pixel in the image to electrophoretic display image data using a look up table (LUT) stored in the non-transitory memory, wherein a different LUT is used depending upon a status of the front light, wherein converting the RGB image data for each pixel in the image to electrophoretic display image data further comprises assigning a color separation cumulate to the electrophoretic display image data based upon a linear combination of primary colors produced by the electrophoretic display; and
send the electrophoretic display image data for each pixel to the controller.