Apparatus and method for color shift compensation in displays

Method for color shift compensation implemented in an active matrix display module comprising a driving circuit with a source driver and a gate driver, and a display panel with pixels consisting of three sub-pixels being arranged in demultiplexing columns, each sub-pixel comprising a sub-pixel selection transistor arranged at an intersection of a row and a column and corresponding demultiplexer selection lines implementing a 1:3 multiplexing scheme where each pixel belongs to a different multiplexing group, the method comprising the following steps:

• during a first frame:
• (a) selecting a row by the gate driver,
• (b) charging all sub-pixels in the middle of respective multiplexing groups of said row, each multiplexing group consisting of three sub-pixels, with respective predetermined voltage polarities by respective source driver lines responsive to application of a respective signal pulse on a corresponding demultiplexer selection line,
• (c) charging one of the two neighboring sub-pixels of the middle sub-pixel of each multiplexing group of said row with a first voltage polarity, and selecting an adjacent sub-pixel of an adjacent multiplexing group at the same time,
• (d) charging the other neighbor sub-pixel of the middle sub-pixel of each multiplexing group of said row with a second voltage polarity opposite to the first voltage polarity, whereby two sub-pixels of the two adjacent multiplexing groups are selected simultaneously,
• (e) repeating the steps (a)-(d) for every row until the whole display panel is addressed,
• during a second, subsequent frame:
• (f) inverting the respective polarities of the two neighboring sub-pixels of the middle sub-pixel of each multiplexing group of a row and charging the respective middle sub-pixels with the respective predetermined voltage polarities,
• (g) repeating the step (f) for every row until the whole display has been addressed.