Electro-wetting Display Driving Method for Fluid Stability
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Solution Overview
Problem
Electro-wetting display panels face issues with fluid back-flow when a constant voltage is applied, leading to increased power consumption and heat generation, as well as limited resolution due to the need for frequent reset signals.
Innovation Solution
A method of driving the electro-wetting display panel involves applying different data voltages based on gamma curves during different sections of a frame to control fluid movement and prevent back-flow, using a timing controlling part and data driver to generate and apply these voltages, allowing for reduced frequency of reset signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a constant voltage is continuously applied to prevent fluid back-flow, then the fluid stability is improved, but the power consumption and heat generation increase
Solution Approach 1:
The patent applies periodic voltage pulses instead of continuous constant voltage. A data voltage is applied during a data period to position the fluid, then the voltage is reduced or suspended during a sustain period. This periodic action maintains fluid stability while significantly reducing power consumption compared to continuous voltage application.
2Stability of the object's composition
If a reset signal is applied at every frame to prevent fluid back-flow, then the fluid position stability is improved, but the resolution is limited
Solution Approach 1:
The patent dynamically adjusts the voltage applied to the fluid based on the display content. Instead of applying uniform reset signals at every frame, the system applies data voltages converted from display data using gamma curves during data periods, and reduces or suspends voltage during sustain periods. This dynamic approach maintains fluid position stability while enabling higher display resolution by reducing unnecessary reset operations.
3Measurement precision
If the data driving frequency is increased to prevent fluid back-flow, then the fluid control precision is improved, but the power consumption increases
Solution Approach 1:
The patent implements periodic action by applying data voltages only during data periods when fluid positioning is necessary, then suspending or reducing voltage during sustain periods. This approach maintains precise fluid control when needed while significantly reducing power consumption compared to continuous high-frequency voltage application.
Solution Approach 2:
The patent applies voltage partially rather than continuously. During sustain periods, the voltage is reduced or suspended even though the fluid position may need to be maintained. This partial action approach maintains sufficient fluid control precision while reducing power consumption by avoiding excessive voltage application during periods when full control is not necessary.
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 approach reduces fluid back-flow, decreases power consumption and heat generation, and maintains brightness by using high and low grayscales alternately, preventing brightness reduction and allowing for efficient display operation.
Implementation Method 1
a voltage is applied to the aqueous liquid (for example, water) to change a surface tension of the water
Implementation Method 2
change a surface tension of the water
Data Source
AI summary
A method of driving an electro wetting display panel includes applying a first data voltage to a pixel part of the display panel during a first section of a frame and applying a second data voltage different from the first data voltage to the same pixel part during a second section of the frame. The first data voltage is converted from display data based on a first gamma curve. The second data voltage is converted from the display data based on a second gamma curve. Light transmittance through the pixel part is changed based on movement of a fluid within the pixel part.