Electrophoretic Device Pixel Voltage Correction for Accurate Gradation
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Solution Overview
Problem
Conventional electrophoretic display devices face issues with achieving desired optical characteristics due to electrophoretic particle overflow and uneven pixel area ratios caused by electric field leakage, leading to inaccurate gradation display.
Innovation Solution
The electrophoretic device measures the optical characteristics when changing the proportion of pixel electrodes supplied with different voltages, calculates the desired proportion based on these measurements, and adjusts the voltage supply to achieve accurate optical characteristics by using a function R=f(x) and its inverse to determine the required pixel voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If area gradation method is used to achieve gradation display, then optical characteristic control is simplified, but particle overflow and electric field leakage cause inaccurate optical characteristics
Solution Approach 1:
The patent applies preliminary action by pre-measuring the actual optical characteristics for each pixel at the factory and storing correction data. This allows the system to compensate for particle overflow and electric field leakage effects without changing the simple area gradation control method, thus maintaining ease of operation while improving optical characteristic accuracy.
2Reliability
If electrophoretic particles are used for display, then memory property and wide angle visibility are achieved, but particle overflow occurs causing pixel area ratio deviation
Solution Approach 1:
The patent implements feedback by measuring the actual optical characteristics of each pixel and using this information to correct the gradation display. The system adjusts the voltage application based on pre-measured correction data, compensating for particle overflow effects and maintaining accurate pixel area ratios while preserving the memory property of electrophoretic particles.
3Adaptability or versatility
If electric field is applied to change particle distribution, then optical characteristic changes, but electric field leakage causes cross-talk between adjacent pixels
Solution Approach 1:
The patent applies preliminary action by pre-characterizing each pixel's optical response to voltage application and storing this data for correction purposes. This allows the system to maintain versatile optical control while compensating for electric field leakage effects that cause cross-talk, as each pixel's display is adjusted based on its individually measured characteristics.
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 allows for reliable realization of desired optical characteristics, enabling precise gradation expression and reducing the impact of particle overflow and electric field leakage, resulting in improved image appearance and accuracy.
Implementation Method 1
an electrophoretic display device that utilizes the fact that when an electric field is applied to the electrophoretic dispersion liquid, a distribution of the electrophoretic particles is changed and an optical characteristic of the electrophoretic dispersion liquid changes
Data Source
AI summary
The electrophoretic device of the present invention obtains a plurality of different optical characteristics by changing a proportion of number of pixel electrodes supplied with a first voltage and a number of pixel electrodes supplied with a second voltage. The transition of the optical characteristics accompanied by the changes of the proportion is previously obtained as an actual measurement value. The preferable proportion displaying the desired optical characteristic is calculated based on the actual measurement value.