Self-Refresh Memory in Pixel Circuit With 18-bit Color Depth for Liquid Crystal Displays

In this letter, we propose memory in pixel (MIP) circuit that achieves 6-bit depth per sub-pixel, resulting in an 18-bit color depth for RGB displays. The circuit integrates two memory cells, each storing 3-bit gray level data, allowing the pixel to self-refresh without requiring continuous input from the graphics processor. This is achieved with a novel driving scheme that eliminates the need for continuous data processing for a static image. The proposed circuit achieves a 97.2% reduction in power consumption compared to the conventional pixel circuit. Furthermore, it extends the bit depth per sub-pixel from 3-bit in our previous work to 6-bit, significantly enhancing grayscale resolution. In addition, the circuit supports gamma correction, allowing precise grayscale reproduction across the full dynamic range.