Electrophoresis Display Driving Method for Halftone Uniformity
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Solution Overview
Problem
Electrophoresis display devices face issues with uneven halftone display due to unstable voltage application, leading to impaired display quality, particularly when switching elements fail to consistently supply voltages required for halftones.
Innovation Solution
A driving method for electrophoresis display devices that involves supplying different pulse widths and voltages in multiple frames to stabilize voltage application across pixels, using a combination of capacitive elements and transistors to manage voltage holding and gradation display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single pulse width is used for voltage application in all frames, then the device complexity is low, but the display uniformity deteriorates due to unstable voltage application
Solution Approach 1:
The driving method segments the voltage application process into multiple frames with different pulse widths. Specifically, it divides the driving period into a first period with a first pulse width and a second period with a second pulse width, allowing different portions of the display to receive optimized voltage application timing for their respective requirements.
Solution Approach 2:
The invention introduces dynamic adjustment of pulse widths based on positional requirements. The pulse width is changed according to the position within the display area, creating a dynamic driving scheme where parameters are not fixed but adapt to spatial requirements, thereby achieving uniform display quality across different regions.
2Manufacturing precision
If the switching element applies voltage inconsistently, then the ease of operation is maintained, but the display quality deteriorates due to uneven halftones
Solution Approach 1:
The invention applies local quality by assigning different pulse widths to different positional regions. The first pulse width is used for a first position and the second pulse width for a second position, optimizing voltage application for each region's specific requirements and achieving consistent halftone display across the entire display area.
3Manufacturing precision
If multiple pulse widths are used to improve display uniformity, then the manufacturing precision improves, but the loss of time increases due to multiple writing operations
Solution Approach 1:
The invention merges multiple writing operations into a single comprehensive driving cycle. By organizing the first and second pulse width applications within one driving period and utilizing the holding capability across frames, it achieves uniform display quality without requiring separate writing operations for each region, thereby reducing overall time loss.
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 method enhances display quality by ensuring consistent voltage application across pixels, reducing display unevenness and maintaining image gradation stability, thereby improving the overall display performance of electrophoresis devices.
Implementation Method 1
a first capacitive element having a first terminal and a second terminal
Data Source
AI summary
The display device includes at least one pixel having a first capacitive element having a first terminal and a transistor connected to the first terminal and having a second terminal and a gate electrode. A driving method of the display device including in a first frame, a signal with a first pulse width is supplied to the gate electrode of the transistor, and a first voltage is written from the second terminal to the first terminal. In the second frame after the first frame, a signal with a second pulse width is supplied to the gate electrode, and the first terminal holds the first voltage. In the third frame after the second frame, a signal with a third pulse width is supplied to the gate electrode, and the second voltage is written from the second terminal to the first terminal.