Secure Display Color Correction via Pre-Calculated Offset Data
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Solution Overview
Problem
Standard TFT display devices exhibit manufacturing-related fluctuations in color values, leading to noticeable differences when multiple devices are used together, which complicates the secure display and verification of image data, especially in safety-critical systems like rail vehicles and nuclear power plants, as they require precise color matching and security integrity levels up to SIL4.
Innovation Solution
A method and device that generate image data for display devices with individual color correction, using a color correction offset value to adjust the data and calculate correction data representing the differences, allowing for recalculations that ensure secure and accurate image data verification by accounting for each device's unique characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual color correction is applied to each display device, then color matching is improved, but verification complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction data for each display device during manufacturing or setup. This correction data compensates for individual device variations in advance, allowing the system to maintain color matching without performing complex real-time calculations during operation. The correction data is applied automatically when image data is processed, simplifying the verification process while maintaining precision.
2Measurement precision
If image data is modified for color correction, then display accuracy is improved, but verification reliability deteriorates
Solution Approach 1:
The patent implements feedback by systematically tracking the correction data applied to each display device and using this information during the verification process. The system feeds back the correction parameters to the verification mechanism, allowing it to account for the modifications made to image data. This ensures that verification remains reliable by comparing against corrected reference values rather than original uncorrected data, maintaining both accuracy and reliability.
3Ease of operation
If standard verification methods are used without correction data, then verification simplicity is maintained, but color matching accuracy is lost
Solution Approach 1:
The patent introduces correction data as an intermediary element between the image data and the verification process. This correction data acts as a mediator that bridges the gap between standard verification methods and individual device characteristics. Instead of modifying the verification process itself, the correction data is applied to the image data beforehand, allowing standard verification methods to continue working while achieving accurate color matching through the intermediary correction layer.
Data Source
Figure 1
AI summary
The invention relates to a method for outputting image data for secure display, in which: the image data (13) are generated for a display apparatus (2); the generated image data (13) are modified depending on a parameter of the display apparatus (2), in particular on a colour correction offset value; and correction data (19) representative of a difference between generated and modified image data (13, 18) are determined. The invention also relates to a device for outputting image data for secure display.