Luminance Correction for Display Sub-Pixels
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Solution Overview
Problem
Flat panel displays, particularly organic light emitting displays, suffer from luminance variations between pixels due to characteristic and manufacturing process variations, leading to luminance spots that degrade image quality.
Innovation Solution
A system and method for luminance correction that includes a display device with sub-pixels, an image detection unit to measure luminance values, and a luminance correction device to calculate and apply correction values based on difference values between measured and target luminance values, using a look-up table and interpolation for precise correction across all gray levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If luminance correction is performed using separate correction values for first sub-pixels and second sub-pixels, then luminance spots are removed and image quality is improved, but device complexity increases due to the need for separate correction units and look-up tables
Solution Approach 1:
The patent divides the correction process into two segments: first correction values for green sub-pixels (first sub-pixels) and second correction values for red and blue sub-pixels (second sub-pixels). This segmentation allows targeted correction of luminance spots in different sub-pixel groups, improving luminance uniformity while managing complexity through structured separation of correction operations.
Solution Approach 2:
The patent applies different correction strategies to different sub-pixel groups based on their specific luminance characteristics. First correction values are calculated for green sub-pixels based on their measured luminance values, while second correction values are derived for red and blue sub-pixels. This local quality approach ensures each sub-pixel group receives appropriate correction tailored to its properties.
2Measurement precision
If correction values are calculated for all gray levels through measurement and calculation, then correction precision is maximized, but measurement time and processing time increase significantly
Solution Approach 1:
The patent performs preliminary measurement and calculation of correction values for reference gray levels (e.g., first and second reference gray levels) during the manufacturing or setup phase. These reference correction values are stored in look-up tables for rapid retrieval during operation, eliminating the need to perform time-consuming measurements and calculations for all gray levels in real-time.
Solution Approach 2:
The patent measures and calculates correction values for only selected reference gray levels rather than all possible gray levels. By measuring first reference correction values at a first reference gray level and second reference correction values at a second reference gray level, the system achieves sufficient correction coverage through interpolation for intermediate gray levels, reducing measurement and processing time while maintaining adequate correction accuracy.
3Object-generated harmful factors
If separate correction values are calculated for first and second sub-pixels, then luminance spot removal effectiveness is improved, but calculation complexity and processing requirements increase
Solution Approach 1:
The patent segments the correction calculation into two distinct processes: calculating first correction values for green sub-pixels based on their measured luminance values and target luminance values, and calculating second correction values for red and blue sub-pixels based on the first correction values. This segmentation improves luminance spot removal effectiveness by addressing each sub-pixel group's specific characteristics while organizing the calculation complexity into manageable, structured operations.
Data Source
AI summary
A system and a method for luminance correction that can remove luminance spots of a display device. The system includes a display device, an image detection unit, and a luminance correction device. The display device includes a plurality of sub-pixels including first sub-pixels and corresponding second sub-pixels. The image detection unit is configured to measure respective luminance values of the first sub-pixels. The luminance correction device is configured to supply test data so that only the first sub-pixels emit light, and to calculate correction values corresponding to the plurality of sub-pixels based on difference values between the respective luminance values measured by the image detection unit and one or more target luminance values.