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.

In this letter, we create a path to remove excess carriers in the base region of a SiGe phototransistor (HPT) by introducing the trap centers. The behavior of the trap centers in the SiGe heterojunction bipolar transistor (HBT) is a form of nonideal (nkT) base current. The responsivity of the device is 0.43 A/W with fully SiGe HBT-compatible device structure to facilitate the integration of the following amplification circuitry. The full-width at half-maximum of the pulse is 90 ps and the tail of the optical pulse response is largely reduced with the nkT current. By reducing the tail, bandwidth is increased from 1.5 to 3 GHz. This proposes SiGe HPT is applicable for optoelectronic technology.

To achieve quick response electrowetting displays for video applications, the charge trapping phenomenon should be well coped with. For this purpose, an asymmetrical driving concept is proposed and a charge-trapping suppression method is developed in this paper. The performance of the proposed method was investigated and satisfactory results were obtained.

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