Diagonal Mura Compensation for Single-Side Display Drivers
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Solution Overview
Problem
Display devices with a single side driving (SSD) structure are prone to mura artifacts, which are darkened or lightened blotches, due to the placement of scan and data drivers on one side, leading to visual imperfections.
Innovation Solution
A mura compensation method and system that captures images of the pixel unit, calculates mura luminance by rotating sample areas to align diagonal mura in a column direction, determines target luminance, and calculates compensation values for each sample area based on mura luminance and luminance distribution, applying these values to correct luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If scan driver and data driver are disposed at one side of the display device to reduce bezel thickness, then bezel thickness is reduced, but mura artifacts are generated
Solution Approach 1:
The patent applies parameter changes by measuring luminance at multiple sample gray levels (first sample gray level and second sample gray level) and calculating compensation values for each gray level. This allows the system to adjust luminance parameters dynamically across different gray levels to compensate for mura artifacts while maintaining the SSD structure's thin bezel advantage.
Solution Approach 2:
The patent implements feedback by capturing images at different gray levels, calculating mura luminance and target luminance, determining compensation values, and applying these compensations to display data. This closed-loop feedback system continuously monitors and corrects mura artifacts generated by the SSD structure.
2Manufacturing precision
If compensation is performed for mura artifacts, then image quality is improved, but processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the pixel unit into multiple sample areas (first sample area and second sample area) and performing compensation calculations for each area separately. This segmentation allows complex mura compensation to be broken down into manageable portions, processing each sample area independently to reduce overall computational complexity.
Solution Approach 2:
The patent implements preliminary action by pre-calculating compensation values for multiple sample gray levels before actual display operation. The system captures images at different gray levels, calculates mura luminance and compensation values in advance, and stores these for application during normal display operation, reducing real-time processing requirements.
Data Source
AI summary
A mura compensation method for a display device in which a data driver and a scan driver disposed at a first side of a pixel unit, includes capturing an image of the pixel unit based on a predetermined first sample gray level; calculating mum luminance of diagonal mura corresponding to the first sample gray level by sharpening the diagonal mura based on light components of the captured image for a first sample area including the diagonal mura; calculating target luminance based on the mura luminance and a luminance distribution of the imaged first sample area; and calculating a first compensation value corresponding to the first sample gray level and a pixel corresponding to the diagonal mura in the first sample area by using the first sample gray level, the mura luminance, and the target luminance.