Electrophoretic Display Driving Method for Gray-Scale Contour Correction
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Solution Overview
Problem
Existing driving methods for electrophoretic display apparatuses face challenges in achieving desired gray-scale levels due to influences from surrounding pixels, leading to variations in image quality.
Innovation Solution
A driving method that involves writing first image data into a display unit and creating second and third image data to correct gray-scale levels for contour pixels affected by adjacent or enclosing pixels, with the second image data targeting pixels adjacent to different gray-scale levels and the third image data targeting pixels surrounded by multiple different gray-scale levels, allowing for precise voltage corrections to achieve desired gray-scale levels across the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If adjacent pixels are supplied with different voltages to display different gray-scale levels, then image content differentiation is improved, but gray-scale level accuracy deteriorates due to electric field leakage affecting surrounding pixels
Solution Approach 1:
The patent applies preliminary action by identifying contour pixels before voltage application and pre-calculating corrected voltages that compensate for expected electric field leakage. The control circuit determines which pixels are contour pixels (adjacent to pixels with different gray-scale levels) and applies corrected voltages to these pixels in advance, preventing gray-scale level accuracy deterioration before it occurs.
Solution Approach 2:
The patent applies local quality by differentiating between contour pixels and non-contour pixels, and applying different voltage correction strategies to each. Contour pixels receive corrected voltages that account for electric field leakage, while non-contour pixels receive standard voltages. This localized approach ensures gray-scale level accuracy is maintained where needed without unnecessarily complicating the overall driving method.
2Manufacturing precision
If correction voltages are applied to all pixels to ensure accurate gray-scale levels, then gray-scale level accuracy is improved, but power consumption increases due to additional voltage application operations
Solution Approach 1:
The patent applies local quality by identifying and treating only contour pixels that require correction, rather than applying correction voltages to all pixels. The control circuit determines which pixels are contour pixels (those adjacent to pixels with different gray-scale levels) and applies corrected voltages only to these specific pixels, thereby maintaining gray-scale level accuracy while minimizing additional power consumption.
Solution Approach 2:
The patent applies partial action by applying correction voltages to only the necessary subset of pixels (contour pixels) rather than all pixels. This partial correction approach is sufficient to maintain overall image quality and gray-scale level accuracy while significantly reducing the power consumption associated with voltage application operations compared to a full-screen correction approach.
3Manufacturing precision
If multiple image data corrections are performed to address contour pixels, then display quality is improved, but processing time increases due to additional image data creation and writing operations
Solution Approach 1:
The patent applies preliminary action by performing contour pixel identification and voltage correction calculation in advance before the actual display update. The control circuit analyzes the image data, identifies contour pixels, and determines corrected voltages beforehand, allowing the display to be updated efficiently without time-consuming corrections during the display refresh cycle.
Solution Approach 2:
The patent applies feedback by using the original image data as a reference to identify contour pixels and determine appropriate correction voltages. The control circuit compares adjacent pixel values, detects discrepancies indicating contour pixels, and applies corrections based on this feedback information, ensuring display quality improvement while maintaining efficient processing through iterative refinement rather than multiple complete rewrites.
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 enables high-quality display by ensuring accurate gray-scale levels across the entire screen, reducing power consumption, and improving image quality by minimizing the number of pixels requiring voltage corrections.
Implementation Method 1
electrophoretic elements each provided therein with microcapsules each encapsulating therein electrically-charged black or white particles... causes each pair of the electrodes to be subjected an electric-potential difference therebetween and attract the black-color particles and the white-color particles
Data Source
AI summary
A driving method for driving an electrophoretic display apparatus includes writing first image data into a display unit provided with a plurality of pixels; creating second image data including image data which corresponds to first contour pixels, and which is extracted from the first image data, each of the first contour pixels being a first pixel located adjacent to a second pixel having a gray-scale level different from a gray-scale level of the first pixel, the first pixel and the second pixel being included in the plurality of pixels; and writing the second image data into the display unit.