Display Panel Sensing Data Synchronization for Dark Spot Reduction
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Solution Overview
Problem
Display devices experience differences between sensing data stored in non-volatile memory and applied sensing data, leading to dark spots and lines on the display panel.
Innovation Solution
Incorporating a dummy storage circuit to compare and synchronize sensing data with stored data, using a process that determines differences by subtracting values, and adjusting data signals based on consistent compensation data to reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sensing data is stored in non-volatile memory without verification, then storage speed is improved, but data accuracy deteriorates leading to dark spots and lines
Solution Approach 1:
The patent applies preliminary action by performing verification operations before finalizing data storage. The sensing data is first stored temporarily, then verified through comparison with previously stored data, and only after successful verification is the data confirmed as valid compensation data. This prevents inaccurate data from being permanently stored, resolving the contradiction between fast storage and high accuracy.
Solution Approach 2:
The patent implements feedback by comparing newly acquired sensing data with previously stored sensing data to verify consistency. The comparison circuit checks whether the difference between current and previous data exceeds a reference value, providing feedback on data validity. This feedback mechanism ensures data accuracy while maintaining efficient storage operations.
2Manufacturing precision
If sensing data is verified through comparison with stored data, then data accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies partial action by performing verification only on critical aspects of the sensing data. Rather than completely re-verify all data points, the system compares key parameters against stored reference values and only performs full verification when differences exceed reference thresholds. This selective verification maintains data accuracy while minimizing processing time overhead.
3Measurement precision
If difference detection is performed by subtracting sensing data values, then measurement precision is improved, but calculation complexity increases
Solution Approach 1:
The patent applies parameter changes by transforming the verification approach from direct value comparison to difference calculation against reference values. Instead of comparing raw sensing data values directly, the system calculates differences between current and previous data, then compares these differences against a reference threshold. This parameter transformation maintains high measurement precision while simplifying the comparison logic.
Data Source
AI summary
A display device may include a display panel including a plurality of pixels and a data driver configured to apply data voltages to the plurality of pixels based on a data signal, a sensing driver configured to receive sensing current from at least one pixel of the plurality of pixels and to output sensing data based on the sensing current, a non-volatile memory circuit configured to store the sensing data as stored sensing data and a driving controller configured to output the data signal to the data driver and to store the sensing data received from the sensing driver. The driving controller may determine a difference between the stored sensing data and the sensing data by comparing the stored sensing data with the sensing data. The non-volatile memory circuit may store the stored sensing data which is the same as the sensing data as stored compensation data.