Image display device, image display system, and inspection method
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Solution Overview
Problem
Existing image display devices struggle to easily detect non-linearity in the input/output characteristics of signal transmission paths, making it difficult to recognize deviations in gradation levels, which can affect image quality.
Innovation Solution
An image display system and method that generates a pattern image with regularly arranged partial images of varying gradation levels, applying a conversion rule to visually detect non-linearity by altering gradation levels to create recognizable patterns on the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a predetermined contrast pattern is displayed to detect luminance deterioration, then luminance degradation can be easily detected, but non-linearity in the input/output characteristic of the signal transmission path cannot be detected
Solution Approach 1:
The image signal is segmented into multiple regions with different gradation levels (first region with lower gradation, second region with higher gradation). This segmentation allows the display device to show distinct patterns that reveal non-linearity in the signal transmission path, enabling detection of both luminance deterioration and non-linear characteristics simultaneously.
Solution Approach 2:
The invention changes the gradation level parameter across different regions of the displayed image. By setting specific gradation levels in different regions and comparing how they are transmitted and displayed, the system can detect non-linearity in the signal path. The conversion unit adjusts gradation level values based on detected non-linear characteristics, further optimizing the detection capability.
2Reliability
If the gradation level deviation is small, then the image quality remains acceptable, but it becomes difficult to recognize presence of non-linearity in the signal transmission path
Solution Approach 1:
Different regions of the displayed image are assigned different local qualities in terms of gradation levels. The first region uses a lower gradation level while the second region uses a higher gradation level. This local differentiation makes even small non-linear deviations visible as pattern distortions, allowing detection while maintaining overall image quality.
Solution Approach 2:
The invention utilizes changes in luminance/gradation levels (analogous to color changes) to detect non-linearity. By creating distinct gradation patterns that should appear uniform or follow a specific pattern if transmitted linearly, any deviation in the displayed pattern reveals non-linear characteristics in the signal path, even when deviations are small.
3Ease of operation
If conventional display methods are used, then normal image display is maintained, but inspection of non-linearity requires complex measurement equipment and procedures
Solution Approach 1:
The display device performs self-inspection by displaying specific test patterns with known gradation characteristics and comparing the displayed pattern against the original signal characteristics. The conversion unit within the display device can detect non-linearity and perform automatic correction, eliminating the need for external complex measurement equipment and simplifying the inspection process.
Solution Approach 2:
The display device is designed to perform multiple functions: normal image display, test pattern display for non-linearity detection, and automatic correction of non-linear characteristics. The conversion unit and control logic enable the same hardware to serve both display and inspection purposes, reducing the need for separate complex inspection equipment.
Data Source
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AI summary
An image display device (200) includes: an image signal reception unit (201) configured to receive an image signal of a pattern image in which N partial images having a different gradation level value are regularly arranged; a conversion unit (202) configured to convert a part of gradation level values included in the image signal in accordance with a predetermined conversion rule; and a display unit (203) configured to display by using an image signal that undergoes conversion by the conversion unit (202). The conversion unit (202) converts a gradation level value corresponding to a term of a predetermined arithmetic progression in accordance with the predetermined conversion rule.