Sensing-less Compensating System for Display Subpixel Degradation
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Solution Overview
Problem
Display devices with subpixels experience degradation of circuit elements over time, leading to driving deviations between subpixels, which diminish display quality due to varying degrees of degradation.
Innovation Solution
A sensing-less compensating system that includes a degradation management circuit and data driving circuit to calculate and compress accumulated stress data, providing bit size information for loss-compressed data to maintain display quality by compensating for subpixel degradation in real time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If accumulated stress data is compressed to reduce storage requirements, then storage efficiency is improved, but data loss increases
Solution Approach 1:
The patent segments accumulated stress data into two distinct types: first type data (requiring lossless compression) and second type data (allowing lossy compression). This segmentation enables different compression strategies to be applied to different data portions, optimizing both storage efficiency and data quality based on the specific requirements of each data type.
Solution Approach 2:
The patent applies local quality by providing bit size information specifically for the second type data that enables selective restoration. This allows the system to maintain high quality where needed (first type data) while accepting lower quality where acceptable (second type data), achieving a balance between storage efficiency and data integrity.
2Loss of information
If lossless compression is applied to all accumulated stress data, then data integrity is maintained, but storage efficiency decreases
Solution Approach 1:
The patent divides accumulated stress data into first type data (processed with lossless compression to maintain integrity) and second type data (processed with lossy compression for efficiency). This segmentation allows the system to maintain data integrity only where necessary while achieving storage efficiency elsewhere.
Solution Approach 2:
The patent changes the compression parameter from a uniform lossless approach to a differential approach, applying lossless compression to first type data and lossy compression to second type data. This parameter change enables the system to optimize the trade-off between data integrity and storage efficiency based on the specific characteristics of different data types.
3Device complexity
If circuit element degradation is not compensated, then device complexity is reduced, but display quality deteriorates
Solution Approach 1:
The patent implements preliminary action by calculating and storing accumulated stress data that reflects circuit element degradation over time. This pre-calculated degradation information is then used to generate compensation values that are applied to data voltages, allowing the system to proactively compensate for degradation before it significantly impacts display quality.
Solution Approach 2:
The patent establishes a feedback mechanism where accumulated stress data is continuously monitored and used to adjust data voltages through compensation values. This closed-loop feedback system automatically compensates for circuit element degradation, maintaining display quality without requiring complex manual intervention or sensing circuits.
4Manufacturing precision
If real-time compensation is implemented, then display quality is maintained, but processing time increases
Solution Approach 1:
The patent performs preliminary calculations of accumulated stress data and compensation values in advance, storing them for later use. This allows the actual compensation process during display operation to be faster, as the heavy computational work has already been completed beforehand.
Solution Approach 2:
The patent implements periodic action by updating accumulated stress data and compensation values at specific intervals rather than continuously. This periodic update approach maintains display quality through regular compensation while reducing the overall processing time compared to continuous real-time compensation.
Data Source
AI summary
A method for compressing and applying data of the sensing-less compensating system may be provided for a display device having subpixels. As the system can update an accumulated stress data of a subpixel which is accumulated according to a display driving data signal in a real time and perform a compensation, a real time compensation for a degradation of the subpixel can be performed without sensing the subpixel. Furthermore, as the system may provide a bit size information for restoration according to a comparison result of data subject to loss-compress and a loss reference value when loss-compressing the accumulated stress data, a loss ratio of a loss-compression data can be reduced. A display device and a sensing-less compensation system are also disclosed.