Electrophoretic Display Image Removal Method
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Solution Overview
Problem
Electrophoretic display devices face the challenge of generating afterimages (burn-in phenomenon) during image updates, leading to increased power consumption as all pixels, including those with unchanged gray scales, are driven to maintain the final display state.
Innovation Solution
A method is introduced where an image removing area is set to include pixels forming the image component and those adjacent to its contour, with these pixels being selectively changed to a second gray scale to remove the image without generating afterimages, while minimizing power consumption by driving only the necessary pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all pixels are driven to remove images including pixels with unchanged gray scales, then afterimages are prevented, but power consumption increases
Solution Approach 1:
The patent divides the display area into three distinct regions: image component pixels (first gray scale), contour adjacent pixels (second gray scale), and background pixels (third gray scale). This segmentation allows selective driving of only necessary pixels for image removal, preventing afterimages while reducing power consumption by excluding unchanged background pixels from the driving operation.
Solution Approach 2:
Different gray scales are assigned to different spatial regions based on their functional requirements. The first gray scale removes images in content areas, the second gray scale prevents afterimages at contours, and the third gray scale maintains unchanged background areas. This local differentiation optimizes both afterimage prevention and power efficiency.
2Use of energy by moving object
If only image component pixels are driven for image removal, then power consumption is reduced, but afterimages occur at contour portions
Solution Approach 1:
The patent proactively extends the image removal operation to include contour adjacent pixels (second gray scale) before afterimages can form. By preemptively driving these boundary pixels in addition to image component pixels, the system prevents the diagonal electric field effects that cause afterimages while maintaining power efficiency compared to driving all pixels.
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 effectively prevents afterimages from forming during image updates while reducing power consumption by limiting the number of driven pixels, maintaining a uniform electric potential balance across the display unit and preventing image unevenness.
Implementation Method 1
an electrophoretic display device having a display unit that is formed of a plurality of pixels by pinching an electrophoretic element including electrophoretic particles between substrates forming one pair
Data Source
AI summary
There is provided a method of driving an electrophoretic display device including a display unit that has a plurality of pixels and an electrophoretic element disposed between substrates forming one pair. The method includes setting an area that at least includes a pixel forming an image component that is formed to have a first gray scale and a pixel that is disposed to be adjacent to the pixel forming the contour of the image component and represents a second gray scale as an image removing area and selectively changing the pixels that constitute the image removing area to have the second gray scale.