Electro-wetting Display Pixel Electrode Spacing Reduces Hysteresis
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Solution Overview
Problem
Electro-wetting displays suffer from a hysteresis phenomenon at specific voltages, leading to abnormal gray scale and reduced response speed due to the surface tension of the fluid used.
Innovation Solution
The electro-wetting display incorporates a first and second substrate with a fluid layer, including a colored first fluid and a transparent second fluid, along with a switching device and pixel electrode connected to gate and data lines. A spacing electrode adjacent to the pixel electrode helps in reducing hysteresis by spacing the first fluid from the barrier wall before applying the data voltage, using a gate-on voltage applied to the previous gate line to prevent abnormal gray scale and response speed issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is applied to the pixel electrode to control fluid movement, then display function is achieved, but hysteresis phenomenon causes abnormal gray scale and reduced response speed
Solution Approach 1:
A gate-on voltage is applied to the (i-1)th gate line before applying the data voltage to the pixel electrode. This preliminary action moves the first fluid away from the barrier wall in advance, preventing the hysteresis phenomenon from occurring when the data voltage is subsequently applied, thereby eliminating abnormal gray scale and improving response speed
2Adaptability or versatility
If voltage is applied to control fluid movement, then electro-wetting display function is achieved, but hysteresis phenomenon occurs at specific voltages causing abnormal gray scale
Solution Approach 1:
The gate-on voltage applied to the previous gate line performs a preliminary action that positions the first fluid away from the barrier wall before the data voltage is applied. This prevents the fluid from being in a position where hysteresis would cause abnormal gray scale, ensuring accurate gray scale display across all voltage levels
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces or prevents abnormal gray scale and lowers response speed issues, improving display characteristics by managing the movement of fluids and voltage application across the display panel.
Implementation Method 1
A display apparatus using an electro-wetting phenomenon, in which a surface tension of fluid is varied by voltage applied thereto and the variation of the surface tension causes movement or deformation of fluid
Implementation Method 2
a surface tension of fluid is varied by voltage applied thereto and the variation of the surface tension causes movement or deformation of fluid
Data Source
AI summary
An electro-wetting display includes a first substrate, a second substrate which faces the first substrate, and a fluid layer between the first and second substrates. The first substrate includes a plurality of gate lines, a plurality of data lines, and a plurality of pixels connected to the gate lines and the data lines. A fluid layer includes a first fluid layer having a color and a second fluid layer which is transparent. Each pixel includes a switching device, a pixel electrode in connection with the switching device, and a spacing electrode. The switching device is connected to an i-th gate line of the gate lines and a j-th data line of the data lines. The spacing electrode is adjacent to a side of the pixel electrode and in connection with a (i−1)th gate line of the gate lines.