Notch patterns in direct-drive Electrowetting Displays

摘要

The novel reflective display based on electrowetting technology has great potential to implement electronic paper. This technology can provide high efficiency control of the display pixel reflectivity. In the on-state, the droplet is expected to move to the same corner regularly. As the visibility of the notch may influence the display quality, perception experiments are important to investigate this effect. First, we propose a methodology to investigate the notch visibility based on perception experiments. Next, we present the results for high contrast, direct-drive displays, where we have chosen to study the effects without any corrections to the display. This allows us to get a very good feel for the preferred notch pattern and size in direct-drive displays. Results indicated that most people preferred the most regular patterns. The result on the notch size indicated that in an uncorrected display the notch becomes perceptible at a size of about 5.5% of the pixel, and only starts to have an impact on the visual perception above a size of 17.6% of the pixel. Using this knowledge, we have been able to implement optical correction in displays, so that the notch has little or no impact on image quality.