Unevenness Evaluation Using Multi-Range Visual Transfer Functions
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Solution Overview
Problem
Existing methods for evaluating unevenness in display panels are inadequate as they use a single visual transfer function, which is not suited for various applications and usage methods, leading to inconsistent judgments across different screen sizes and visibility ranges.
Innovation Solution
An unevenness evaluation method and apparatus that utilize multiple visual transfer function curves for different ranges, with a filter process involving a low-pass and high-pass filter, to calculate an evaluation value tailored to human vision characteristics for each display panel application, ensuring accurate and comprehensive evaluations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single visual transfer function is used for unevenness evaluation, then the evaluation process is simple, but the evaluation accuracy deteriorates for various applications and screen sizes
Solution Approach 1:
The patent divides the visual transfer function into multiple segments (short-range and long-range functions) with different characteristics. Each segment is optimized for specific spatial frequency ranges, allowing the evaluation system to accurately assess unevenness for different screen sizes and viewing distances without using a single compromised transfer function.
Solution Approach 2:
The patent implements a dynamic selection mechanism that chooses between short-range and long-range visual transfer functions based on the display panel's characteristics and viewing conditions. This dynamic adaptation allows the evaluation system to maintain high accuracy across various applications while managing computational complexity through selective processing.
2Adaptability or versatility
If different visual transfer functions are used for different screen sizes, then the evaluation suits specific applications, but the device complexity increases
Solution Approach 1:
The patent creates a universal evaluation framework that handles multiple screen sizes and applications through a unified structure. The system incorporates both short-range and long-range visual transfer functions within a single evaluation apparatus, allowing one device to accurately evaluate diverse display panels without requiring separate specialized systems for each application type.
Solution Approach 2:
The patent adjusts parameters such as spatial frequency weighting and transfer function selection based on display panel characteristics and viewing conditions. By dynamically changing these parameters rather than maintaining fixed complex structures, the system achieves adaptability across applications while keeping the underlying evaluation architecture relatively simple.
3Ease of operation
If amplitude-based evaluation is used, then the quantitative evaluation is easy, but the evaluation reliability deteriorates as it does not account for human vision characteristics
Solution Approach 1:
The patent introduces visual transfer functions as intermediary elements that bridge the gap between raw luminance data and human perception. These transfer functions act as mediators that transform objective amplitude measurements into perception-based evaluation values, maintaining the simplicity of quantitative evaluation while significantly improving reliability by accounting for human vision characteristics such as contrast sensitivity and spatial frequency response.
Data Source
AI summary
Given that a plurality of visual transfer function curves for a display panel are provided for each of different ranges from the display panel, two-dimensional luminance distribution data of the display panel is filtered using a filter having visual frequency characteristics substantially passing through: a part where a recognition sensitivity increases as a spatial frequency increases in a short-range function curve, which among the plurality of visual transfer function curves is the closest to the display panel; a peak part of the short-range function curve; a peak part in a long-range function curve, which among the plurality of visual transfer function curves is the farthest from the display panel; and a part where the recognition sensitivity decreases as the spatial frequency increases in the long-range function curve. An evaluation value of luminance unevenness of the display panel is calculated on the basis of the filtered two-dimensional filtering data.