Sharp developed a new type of memory LCD with ultra-low power consumption

- Mar 04, 2019-

Since the pixels of a liquid crystal display (LCD) are relatively large, it is possible to integrate the memory in an active memory backplane of each pixel site; Sharp is already in Japan. A small monochrome LCD of 96 × 96 pixels achieved the above goal, and claimed that its power consumption is 130 times lower than the standard LCD panel of the same size.


By adding memory to each pixel, when the frame and interframe content are transformed, the data only needs to be transferred to the display; and most liquid crystal displays need to pass through a microcontroller at 50~60Hz. The content of the entire screen is rewritten between frames and even the picture may not change at all. That is, this kind of redundant data transmission consumes a lot of power.


Sharp said that its 1.35" memory LCD, which consumes only about 15 microwatts of power while operating, consumes about 2 milliwatts of power for standard LCDs. The memory LCD is based on Sharp's patented Continuous Grain Silicon technology, so unlike other reflective displays, the new LCD does not require polarisers.


Because it uses a special liquid crystal material, the reflectivity is 50%, and the picture is generated by the black and white state transition of the pixel; in addition, Sharp said that because of the low power consumption, as long as there is a small solar cell, it is enough to provide the memory. The power required by the LCD. Such displays are suitable for portable applications such as medical devices or labels for watches, pulse meters, etc., samples of which are available starting in the second season.