Electrophoretic Display Reducing Passive Matrix Coupling
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Solution Overview
Problem
In passive matrix electrophoretic displays, pixels often exhibit unwanted color due to parasitic capacitor coupling, where a driving voltage intended for one pixel can inadvertently activate other pixels, leading to incorrect color display.
Innovation Solution
The solution involves configuring the electrophoretic display with a plurality of pixels, each coupled to a storage capacitor connected to first and second scan lines, where the first scan line receives a driving voltage and the second scan line is grounded, while other scan lines receive a lower voltage, ensuring the voltage difference for the driven pixel exceeds the threshold for the desired color, while other pixels remain below the threshold, thereby preventing unwanted activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a first scan line receives a first driving voltage to drive a pixel to display a first color, then the pixel can display the desired color, but the first driving voltage may be coupled to other pixels through parasitic capacitors, causing other pixels to display unwanted colors
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the voltage states of scan lines before activating a pixel. Specifically, before applying the first driving voltage to the first scan line, the method ensures that other scan lines are already in appropriate voltage states (either floating or at specific voltages) to prevent coupling effects. This preemptive configuration of voltage levels across the scan line network prevents the parasitic capacitor coupling from causing unwanted pixel activation, thereby maintaining color display accuracy while driving the display.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting voltage levels across different scan lines based on which pixel is being activated. The system changes the voltage parameters of scan lines from a default state to specific driving voltages or intermediate voltages depending on the active pixel location. This parameter modulation ensures that only the intended pixel receives sufficient voltage difference to change state, while other pixels remain below the threshold for unwanted activation, thus eliminating the coupling problem.
2Stability of the object's composition
If other pixels are not turned off when driving one pixel, then the display can maintain previous colors for non-active pixels, but the driving voltage can couple through parasitic capacitors to activate other pixels incorrectly
Solution Approach 1:
The patent applies local quality by creating different voltage conditions for different regions of the display. When a specific pixel is activated, the first scan line receives a high driving voltage while other scan lines are maintained at different voltage levels (floating or at specific intermediate voltages). This local differentiation of voltage states ensures that only the targeted pixel experiences the full voltage difference needed for color change, while other pixels remain in stable states insufficient to trigger unwanted activation, thus maintaining both stability and reliability.
Solution Approach 2:
The patent utilizes equipotentiality principles by maintaining other scan lines at equal or相近 voltage levels when they are not actively driving a pixel. By keeping non-active scan lines at similar potential states (either all floating or all at a reference voltage), the system minimizes voltage differences across parasitic capacitors connected to these lines, thereby preventing coupling effects while maintaining the stability of non-active pixel states.
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 capacitor coupling effects, ensuring that only the intended pixel displays the correct color by maintaining a sufficient voltage difference for the driven pixel while keeping other pixels below the threshold, thus preventing incorrect color display.
Implementation Method 1
Each pixel of the plurality of pixels corresponds to a storage capacitor, and the storage capacitor is coupled to a first scan line and a second scan line
Implementation Method 2
an electrophoretic display capable of reducing passive matrix coupling effect and a method thereof that can reduce capacitor coupling effect of a plurality of pixels of the electrophoretic panel to make the plurality of pixels of the electrophoretic panel display correct color
Data Source
AI summary
An electrophoretic display capable of reducing passive matrix coupling effect includes an electrophoretic panel, a plurality of first scan lines, and a plurality of second scan lines. The electrophoretic panel includes a plurality of pixels. Each pixel of the plurality of pixels corresponds to a storage capacitor, and the storage capacitor is coupled to a first scan line and a second scan line. When the pixel is used for displaying a first color, the first scan line receives a first driving voltage, the second scan line is coupled to ground, and other first scan lines and other second scan lines receive a first voltage. A voltage difference between the first driving voltage and the first voltage and a voltage difference between the ground and the first voltage are smaller than a first threshold value corresponding to the first color.