Electrophoretic Display Refresh Control via Voltage Signal Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In electrophoretic display technology, when the voltage applied to electronic ink corresponding to a pixel has the same polarity but different values at different times, the pixel displays an inaccurate gray level, leading to image sticking during display.
Innovation Solution
An electrophoretic display device with a processor that compares first and second data-voltage signals intended for the same pixel unit at different times, and controls the driving circuit and driving control circuit to ensure accurate gray level display by generating appropriate data-voltage signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage with same polarity but different values is applied to electronic ink at different times, then the pixel can display different gray levels, but the pixel displays inaccurate gray level causing image sticking
Solution Approach 1:
The patent applies preliminary action by comparing the current voltage signal with the previous voltage signal before updating the pixel display. The processor compares the current data voltage signal with the previous data voltage signal for the same pixel, and only updates the pixel when the signals are different, preventing image sticking caused by same-polarity voltage changes.
Solution Approach 2:
The patent implements feedback by storing the previous voltage signal and comparing it with the current voltage signal. The system uses the comparison result to determine whether to update the pixel, creating a feedback loop that ensures accurate gray level display and prevents display errors.
2Reliability
If full-screen refresh is performed to ensure accurate gray level display, then display accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by performing refresh operations only on specific pixel units that require updating, rather than refreshing the entire display screen. The processor identifies pixels where the current voltage signal differs from the previous signal and updates only those pixels, reducing power consumption while maintaining display accuracy.
Solution Approach 2:
The patent implements partial action by selectively refreshing only the necessary pixel units instead of performing a complete full-screen refresh. This partial refresh approach updates only the pixels where voltage signals have changed, significantly reducing power consumption while ensuring accurate gray level display where needed.
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 solution prevents image sticking by ensuring accurate gray level display and reduces power consumption through partial refresh instead of full-screen refresh.
Implementation Method 1
Electrophoretic display technology is regarded as one of important research directions in the field of display technology. Invention of electronic ink greatly promotes development of electrophoretic display technology
Data Source
AI summary
An electrophoretic display device and a method for electrophoretic display refreshing are provided in the disclosure. The electrophoretic display device includes a display screen, a driving circuit, a driving control circuit, and a processor. The display screen includes multiple pixel units. The driving circuit is configured to generate multiple first data-voltage signals at a first time and multiple second data-voltage signals at a second time. The processor is configured to obtain and compare one of the multiple first data-voltage signals and one of the multiple second data-voltage signals that both are to be received by a same pixel unit of the multiple pixel units, to obtain a comparison result, and the processor is configured to control, according to the comparison result, the driving circuit and the driving control circuit to drive the pixel unit to work.