Abnormality Detection Circuit for LCD Panels
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Solution Overview
Problem
Existing liquid crystal display devices require a special panel for abnormality detection, which is not necessary with the proposed solution.
Innovation Solution
An abnormality detection circuit that includes voltage dividing circuits, selectors, comparators, and detectors synchronized with synchronization signals to detect abnormalities without a special liquid crystal display panel, allowing for the use of standard panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a special liquid crystal display panel is used for abnormality detection, then abnormality detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a virtual measurement part by digitally simulating the liquid crystal orientation detection function through image processing algorithms. Instead of using a special panel with physical measurement capabilities, the system captures normal display images and processes them to extract orientation information, thereby achieving abnormality detection without additional hardware complexity
Solution Approach 2:
The patent enables the standard liquid crystal display panel to serve dual purposes: normal video display and abnormality detection. By processing the display output images through image processing circuits, the same panel structure is used for both display functionality and measurement functionality, eliminating the need for separate special panels
2Reliability
If a measurement part is added to detect liquid crystal orientation, then abnormality detection is improved, but device complexity increases
Solution Approach 1:
The patent replaces physical measurement circuits with virtual measurement implemented through image processing algorithms. The analysis unit processes captured images to determine liquid crystal orientation states, achieving the measurement function through software-based image analysis rather than dedicated hardware measurement circuits
Solution Approach 2:
The patent combines the display function and measurement function into a single integrated system. The display output images serve as the measurement signal source, and the image processing circuits are merged with the existing display control architecture, eliminating the need for separate measurement circuits
3Measurement precision
If a special liquid crystal display panel is used, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent achieves measurement precision through digital image processing algorithms that analyze the display output. The image processing unit extracts orientation information from captured images using computational methods, achieving precise measurement without requiring specially manufactured panels with complex physical measurement structures
Solution Approach 2:
The patent enables standard liquid crystal display panels to perform both display and measurement functions. By using the same panel structure for both purposes and achieving measurement through image processing, the system maintains ease of manufacture with standard panels while preserving measurement precision through algorithmic analysis
Data Source
AI summary
An abnormality detection circuit includes: a plurality of voltage dividing circuits; a first selector configured to select and output one of a plurality of outputs of the plurality of voltage dividing circuits; a first comparator configured to compare an output of the first selector with a reference voltage; and a first detector configured to detect an abnormality based on an output of the first comparator, wherein the selection of the first selector is switched in synchronization with a vertical synchronization signal or a horizontal synchronization signal of a liquid crystal display device.