Improving color characteristics of LCD

The drive for larger size, higher spatial resolution, and wider aperture LCD has shown to increase the electrical crosstalk between electrodes in the driver circuit. This crosstalk leads to additivity errors in color LCD. In this paper, the LCD color crosstalk was modeled using a capacitance coupling mode and the crosstalk effect was analyzed with micrographs captured from an imaging colorimeter. The experimental result reveals the subpixel nature of color crosstalk that whenever any two neighboring subpixels are "on" at the same time, there is crosstalk from one subpixel to another, but whenever there is one "off" subpixel between the two "on" subpixels, there is no crosstalk between the "on" subpixels. There is positive crosstalk from right to left across all three subpixels. Based on this crosstalk model, the crosstalk of a LCD was characterized and a spatial subpixel crosstalk correction algorithm was developed to improve the color performance of LCD. The correction algorithm reduced crosstalk by a factor of 16. Compared to a 3D lookup table approach, the new algorithm is easier to implement and more accurate in performance.