Accurate‐gray‐level and quick‐response driving methods for high‐performance electrowetting displays

Abstract

To achieve quick-response electrowetting displays (EWDs) with accurate multiple-graylevel performance for video applications, several phenomena, such as hysteresis, charge trapping, and oil splitting, need to be addressed. This paper proposes a driving scheme that includes the decoupling driving concept, the asymmetric driving concept, the charge-trapping-suppression method, and the oil-splitting method. The proposed driving scheme was extensively investigated on a developed evaluation platform, and satisfactory results for multiple-gray levels and quick response were obtained for a 6-in. SVGA EWD. FIGURE 4 -Alternating-polarity driving scheme: (a) negative-polarity method and (b) positive-polarity method.FIGURE 5 -Decoupling AC-common driving scheme.FIGURE 6 -R-V curve induced by the driving waveforms in Fig. 5. Journal of the SID 19/11, 2011FIGURE 21 -Electrowetting display pixels with (a) AC-common driving method and (b) proposed oil-splitting-suppression method.FIGURE 19 -Response-time measurement of the EWD by chargetrapping-suppression method.FIGURE 20 -Response time of the EWD by oil-splitting suppression method.

Portable multi‐gray scale video playing scheme for high‐performance electrowetting displays

“…The proposed electronic system is a portable, low‐power, multi‐media device. There have been several articles about EWD driving software and hardware . But there are still some improvements about software and hardware in this paper.…”

Improvement of display performance of electrowetting displays by optimized waveforms and error diffusion

“…As we know, there are some effect influence the display quality of EWDs, such as charge trapping phenomenon and oil backflow. Alternating polarity driving scheme is proposed to dealing with the charge trapping issue, including symmetry and asymmetry in driving waveform . However, more gray levels are limited by the asymmetric PWM method.…”

“…Alternating polarity driving scheme is proposed to dealing with the charge trapping issue, including symmetry and asymmetry in driving waveform. [8][9][10] However, more gray levels are limited by the asymmetric PWM method. Applying a reset pulse or refresh during the display period suppresses the backflow and charge trapping.…”

“…In the same year, the Cincinnati team also proposed a three‐dimensional electrohydrodynamic display technology, which supports dynamic display. Yi‐Cheng Chen et al analyze the problem existing in EWD, such as charge trapping and coupling, and put forward the corresponding driving scheme . In recent years, South China Normal University has been dedicated to the development of EWD .…”

“…Yi-Cheng Chen et al analyze the problem existing in EWD, such as charge trapping and coupling, and put forward the corresponding driving scheme. [8][9][10] In recent years, South China Normal University has been dedicated to the development of EWD. [11][12][13][14][15][16] However, display products based on electrowetting technology still have some problems to be overcome.…”