August 2022
Intermediate to advanced
320 pages
12h 52m
English
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3Driving Waveforms and Image Processing for Electrophoretic Displays
Zong Qin1 and Bo‐Ru Yang2
1 School of Electronics and Information Technology, Sun Yat‐Sen University, Guangzhou, China
2 Professor, School of Electronics and Information Technology, State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat‐Sen University, Guangzhou, China
Overview
Driving waveforms are composed of voltage signals and timing sequences, which are essential to control the grayscale and color of a specific pixel accurately. The design concept of producing a waveform is to derive a quantitative relationship between optical responses and the electric field applied. Also, image processing technology is used to manage the optical response further because a TFT backplane's temporal resolution is limited, and software‐based image processing is more convenient and efficient. This Chapter will introduce the waveform technology for electrophoretic displays (EPDs) in the first Section. Next, the second section will discuss how image processing technology facilitates high image quality in EPDs. The third section will introduce several recent advances in driving technologies for future EPDs.
3.1 Driving Waveforms of EPDs
3.1.1 Fundamental Concepts of Waveforms
The movement of charged particles determines an EPD's optical response. The velocity is given by the Stokes equation, as Eq. (3.1) [1, 2].
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