Brightness Compensation Using Enlarged Pixel Units
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Solution Overview
Problem
Current brightness compensation technologies in planar displays, such as OLEDs, face challenges in achieving uniform brightness due to non-uniform luminance (Mura effect) and require high-resolution cameras, which are costly and inefficient for small Mura compensation, and cannot accurately manage gamma curves in actual production processes.
Innovation Solution
The method involves reducing the camera resolution by enlarging the photographing unit from a single pixel to a 2x2 pixel area, allowing for comprehensive brightness determination in larger scopes, measuring and compensating gamma curves at the panel center, and using external memory to determine necessary compensation data, thereby enhancing small Mura compensation and reducing data volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution camera is used to accurately photograph pixel units, then measurement precision of brightness is improved, but device cost and complexity increase
Solution Approach 1:
The patent divides the panel into multiple photographing units, where each unit covers a specific region. Instead of requiring every pixel to be individually photographed with high resolution, the system segments the measurement task across multiple lower-resolution camera positions, achieving comprehensive coverage through coordinated segmentation.
Solution Approach 2:
The patent merges multiple low-resolution photographs taken from different camera positions into a comprehensive brightness dataset. By combining information from multiple photographing units covering different regions, the system achieves accurate brightness measurement without requiring a single high-resolution camera.
2Measurement precision
If smallest photographing unit is reduced to ensure Demura effect, then measurement precision is improved, but data volume increases
Solution Approach 1:
The patent applies different photographing unit sizes to different regions of the panel based on local requirements. Critical areas with severe Mura effects use smaller photographing units for precise measurement, while areas with minor issues use larger units, optimizing the balance between measurement precision and data volume.
Solution Approach 2:
The system performs comprehensive measurement on all regions but selectively applies compensation only where needed. By identifying areas requiring Demura treatment and focusing compensation efforts there, the system reduces unnecessary data processing while maintaining accuracy where it matters most.
3Device complexity
If uniform gamma value is used for estimation, then calculation complexity is reduced, but manufacturing precision of brightness compensation deteriorates
Solution Approach 1:
The patent dynamically adjusts gamma values based on local panel characteristics and measured brightness data. Instead of using a fixed uniform gamma value, the system modifies gamma parameters for different regions and gray levels, significantly improving compensation accuracy while managing calculation complexity through adaptive parameter selection.
Data Source
AI summary
An optimization method and a pre-stage device for brightness compensation, includes: providing a brightness obtaining apparatus; photographing a to-be-compensated panel to obtain a brightness compensation reference frame, where the to-be-compensated panel has first pixel units, the brightness obtaining apparatus has second pixel units, the brightness compensation reference frame includes photographing units, and the photographing unit includes second pixel units, where the second pixel unit is bigger than the first pixel unit; using four second pixel units at four endpoints of each of the photographing units as brightness references, and obtaining pieces of brightness compensation data of the other second pixel units in the photographing unit by using a specific operation mode; and performing brightness compensation for the first pixel units corresponding to each of the photographing units by using the pieces of brightness compensation data.