Abstract
The traditional driving waveform of the electrowetting display (EWD) has many disadvantages, such as the large oscillation of the target grayscale aperture ratio and a long time for achieving grayscale. Therefore, a driving waveform based on the exponential function was proposed in this study. First, the maximum driving voltage value of 30 V was obtained by testing the hysteresis curve of the EWD pixel unit. Secondly, the influence of the time constant on the driving waveform was analyzed, and the optimal time constant of the exponential function was designed by testing the performance of the aperture ratio. Lastly, an EWD panel was used to test the driving effect of the exponential-function-driving waveform. The experimental results showed that a stable grayscale and a short driving time could be realized when the appropriate time constant value was designed for driving EWDs. The aperture ratio oscillation range of the gray scale could be reduced within 0.95%, and the driving time of a stable grayscale was reduced by 30% compared with the traditional driving waveform.
Highlights
In recent years, display technology has been widely used in all aspects of daily life [1,2]
The ratio of a pixel area not covered by the ink to a whole pixel area is the aperture ratio, which can reflect the performance of electrowetting display (EWD) [6]
Where U represents the real-time voltage of a driving waveform; U0 represents the maximum voltage in a driving waveform, which is a fixed value; t represents driving time; and τ represents the time constant of the exponential function
Summary
Display technology has been widely used in all aspects of daily life [1,2]. In 2003, Hayes et al proposed the EWD structure based on the principle of ink electrowetting [3], which has the advantages of low power consumption, high reflectivity, high contrast, and fast response speed. Grayscale is displayed in EWDs by applying a voltage sequence, called as driving waveform, which is used to control the form of colored ink in a pixel [5]. The ratio of a pixel area not covered by the ink to a whole pixel area is the aperture ratio, which can reflect the performance of EWDs [6]. An oscillation of the aperture ratio can be formed, which can reduce the number of grayscale levels and the Micromachines 2020, 11, x visual experience of users.
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