Low‐power‐consumption TFT‐LCD with dynamic memory embedded in the pixels

Abstract

Abstract— A low‐power‐consumption thin‐film‐transistor liquid‐crystal display (TFT‐LCD) with dynamic memory cells embedded in each pixel using low‐temperature poly‐Si technology has been developed. By holding data in the memory, the operating rate of the data driver can be dramatically reduced to 4 Hz. Eight levels of gray scale with low power consumption can be achieved by using the area‐ratio gray‐scale method. This TFT‐LCD can be used for displaying fine still images, with low power consumption.

P‐23: A New LCD Pixel Circuit with Low Refresh Rate Using Memory TFT

“…There have been many researches [1][2][3][4] about memory-in-pixel (MIP) circuit for low power consumption in liquid crystal displays (LCDs). B.H.…”

43.1: A Novel Multi‐level Memory in Pixel Technology for Ultra Low Power LTPS TFT‐LCD

“…Recently, strong demand for ultra low power display with high image quality is growing in mobile information devices [1,5,6]. Several works have been made to realize a "Dual mode" display with memory circuit added to the normal pixel circuit, being capable of both the low power mode with continuous still image and the normal mode with full color high quality image in a mobile display panel.…”

“…Several works have been made to realize a "Dual mode" display with memory circuit added to the normal pixel circuit, being capable of both the low power mode with continuous still image and the normal mode with full color high quality image in a mobile display panel. One approach is by integrating 1 bit digital memory in pixel [2,3,4,5,7], another by in-pixel refresh circuit with inverter [1,6]. For multi-color application, the above approaches require area ratio technique, namely grey-scale by introducing multiple sub-pixels to each RGB in a pixel [4,5,6].…”

Comparison of organic and inorganic alignment layers for low‐power liquid‐crystal devices using low‐frequency applied‐voltage waveforms

“…1 Also, a memory unit was introduced in an AMLCD to store the digital signal, and thus lower the refresh rate. 2,3 The central issue for low-power LCDs is ions that prevent LCDs from being operated at low frequencies. Ions have been long known to cause problems in LCDs.…”