Gamma Correction for Medical Display GSDF Compliance
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Solution Overview
Problem
Display devices for medical images on mobile terminals face challenges in maintaining the gradation characteristic compliant with the Grayscale Standard Display Function (GSDF) due to environmental illuminance variations, leading to inconsistent contrast-response errors.
Innovation Solution
A mobile terminal equipped with a gradation conversion circuit, illuminance sensor, and gamma characteristic corrector that adjusts the gradation conversion based on detected illuminance to maintain GSDF compliance, using a luminance sensor for calibration and look-up table data to correct gamma characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a display device uses a fixed gamma characteristic for GSDF compliance, then gradation accuracy is improved under standard conditions, but contrast-response error increases under varying environmental illuminance
Solution Approach 1:
The patent implements dynamic gamma characteristic adjustment by detecting environmental illuminance levels and switching between multiple gamma characteristics (first gamma for standard conditions, second gamma for bright conditions) to maintain GSDF compliance across varying illuminance environments, resolving the contradiction between fixed gradation accuracy and environmental adaptability
Solution Approach 2:
The patent changes the gamma characteristic parameter based on detected illuminance levels, switching between different gamma curves to optimize contrast-response characteristics for each lighting condition while maintaining compliance with GSDF standards, thereby adapting the display to varying environmental conditions
2Measurement precision
If a mobile terminal performs frequent luminance calibration to maintain GSDF compliance, then display accuracy is improved, but power consumption and operation time increase
Solution Approach 1:
The patent performs luminance calibration periodically when the cover is closed rather than continuously or frequently, reducing power consumption and operation time while still maintaining display accuracy by recalibrating at appropriate intervals using the stored gamma characteristics for different illuminance conditions
3Device complexity
If a display device uses standard gamma characteristic without environmental adaptation, then device complexity is reduced, but contrast-response error rate increases under varying illuminance
Solution Approach 1:
The patent introduces dynamic gamma characteristic switching based on illuminance detection, adding environmental adaptability to maintain GSDF compliance across different lighting conditions while managing system complexity through efficient implementation of multiple gamma characteristics and illuminance-based selection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces contrast-response errors and maintains GSDF compliance across various environmental illuminances, ensuring accurate medical image display on mobile terminals.
Implementation Method 1
an illuminance sensor that detects illuminance of an environment where the display device is placed
Implementation Method 2
at least one luminance sensor that is a luminance sensor attached to a surface of the opening and closing unit facing the front surface when at the second position, and that detects luminance of the front surface
Data Source
AI summary
A display device for displaying image data includes: a gradation conversion circuit that converts a gradation of input image data; a display panel that displays the image data with the gradation converted by the gradation conversion circuit; an illuminance sensor that detects illuminance of an environment where the display device is placed; and a gamma characteristic corrector that controls a gradation conversion circuit so as to convert the gradation by use of a gamma characteristic corresponding to the detected illuminance.