A Self-Refresh Memory-in-Pixel for Low-Power Reflective Liquid Crystal Displays

In this letter, we propose a self-refresh multi-level memory-in-pixel circuit for reflective low-power liquid crystal displays comprising oxide thin film transistors. In the absence of image update, dynamic power consumption can be minimized by integrating memory cell. The memory cell comprises only two transistors and one capacitor, which are suitable for high-resolution displays. Measurement results verify that the proposed circuit achieves 3-bit grayscale display operating at 1 Hz. Moreover, the proposed circuit consumes only 1.72 % of dynamic power compared to the conventional one. Thus, the proposed circuit is expected to simultaneously achieve high performance and low power consumption.