Electrophoretic Display Pixel Write Operation Control
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Solution Overview
Problem
Electrophoretic display devices have a low response speed due to the need to wait for previous write operations to complete, especially when partial areas overlap, leading to slowed display speed and complex software development to avoid overlaps.
Innovation Solution
A method that determines whether a write operation is currently performed on a pixel and allows a new write operation to start only when the previous one is complete, using storage areas to track write information and image data, enabling efficient pixel-by-pixel operation without waiting for previous operations to finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a write operation is performed by performing a pipeline process in units of a partial area, then the display speed is improved, but when partial areas overlap, the driving of a partial area for which a write operation is started later need to wait until a write operation for another partial area is completed, lowering the display speed
Solution Approach 1:
The patent segments the display screen into multiple partial areas and processes write operations for each partial area independently. By dividing the write operation into pixel-level units within each partial area, the system can manage and track the state of each pixel individually, allowing overlapping partial areas to be processed without mutual interference.
Solution Approach 2:
The patent introduces dynamic state tracking for each pixel, recording whether a write operation is currently being performed. This dynamic information allows the system to make real-time decisions about whether to start new write operations, enabling flexible handling of overlapping partial areas and optimizing the pipeline process.
2Productivity
If partial areas are controlled by software so as not to overlap each other, then the display speed is maintained, but the development of the software is highly complicated
Solution Approach 1:
The patent allows partial areas to overlap excessively and processes only the necessary pixels for each write operation. Instead of preventing overlaps, the system performs partial write operations on overlapping regions based on the current write state, simplifying software control while maintaining display speed.
Solution Approach 2:
Each pixel maintains its own write state information, allowing it to self-determine whether a new write operation can be started. This self-service mechanism eliminates the need for complex software coordination to prevent overlaps, as each pixel independently manages its own write operation status.
3Reliability
If a write operation is performed for the entire screen at once, then the display is rewritten, but a new write operation cannot be started for several frames, resulting in low sensed response speed
Solution Approach 1:
The patent divides the entire screen write operation into smaller partial area operations, and further into individual pixel operations. This segmentation allows different parts of the screen to be processed at different times, enabling new write operations to start on pixels that have completed their previous operations while other pixels are still being processed.
Solution Approach 2:
The patent maintains continuous write operations by immediately starting new write operations on pixels that have completed their previous operations. By eliminating idle frames and keeping the write pipeline continuously active across different pixels and partial areas, the system achieves both complete display rewriting and high response speed.
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 improves the response speed of electrophoretic display devices by allowing new write operations to begin as needed, reducing unnecessary operations and enhancing display speed even in devices with long rewriting times.
Implementation Method 1
An electrophoretic display device is configured by sealing an electrophoretic dispersion liquid that contains one or more types of electrophoretic particles and an electrophoretic dispersion medium between opposing transparent electrodes... By applying a voltage between two electrodes, the electrophoretic particles move inside the electrophoretic dispersion medium so as to change the distribution thereof.
Data Source
AI summary
There is provided a method of controlling a display device in which a write operation for changing a display state of one pixel is performed by performing a plurality of operations of applying a driving voltage. The method includes determining whether a previous write operation is currently performed for the one pixel in a case where a new write operation is determined to be required and starting the new write operation for the one pixel in a case where the write operation for the one pixel is determined not to be currently performed in the determining of whether a previous write operation is currently performed, and continuing the write operation that is currently performed and starting the new write operation for the one pixel after completion of the previous write operation in a case where the write operation is determined to be currently performed for the one pixel.