A low‐power 262k‐color SOG (System‐On‐Glass) LCD has been developed for mobile applications. It is integrated with a DC‐DC converter and driver circuits that contain 6‐ bit DACs, and it consumes less than 5 mW in operations with a single voltage power supply of 2.5 V.
A DC-DC converter composed of charge pumps and regulators has been integrated into a poly-Si TFT LCD that also contains a 6-bit DAC. It has the ability to supply regulated voltages to the 6bit DAC and to the LCD's gate driver circuit.
An SOG-LCD with integrated 230kb DRAM frame memory has been demonstrated. To achieve this dense integration, a memory system architecture for horizontal stripe was developed. Memory tests proved a 1MHz operation and retention time of 166ms. Fine images are displayed both in still images and moving pictures.
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