LCD Panel Photoluminescence Detection for Early Deterioration Monitoring
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Solution Overview
Problem
Existing projection type display devices face issues with liquid crystal panel deterioration due to high-intensity light irradiation, necessitating accurate detection of panel degradation.
Innovation Solution
The display device incorporates an optical detection unit to detect light in a second wavelength region, longer than the incident light, emitted from a second surface of the liquid crystal panel, allowing for monitoring photoluminescence changes to assess panel deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-intensity light is used to irradiate the liquid crystal panel, then the display brightness and visibility are improved, but the liquid crystal panel deteriorates faster
Solution Approach 1:
The patent implements preliminary detection of liquid crystal panel deterioration by monitoring photoluminescence before significant degradation occurs. The optical detection unit continuously monitors the liquid crystal panel during operation, enabling early warning and preventive maintenance before the panel fails completely, thus resolving the contradiction between using high-intensity light for brightness and maintaining panel reliability
Solution Approach 2:
The system establishes a feedback mechanism where the optical detection unit monitors photoluminescence characteristics and provides information about panel deterioration to the control unit. This feedback enables dynamic adjustment of operating conditions or maintenance scheduling based on actual panel state, allowing the system to maintain high display brightness while managing panel deterioration through informed control decisions
2Measurement precision
If the liquid crystal panel is monitored continuously to detect deterioration, then the detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent extracts only the essential photoluminescence signal from the liquid crystal panel for deterioration detection, using an optical detection unit that specifically targets the wavelength characteristics of photoluminescence. By focusing only on the relevant optical signal rather than monitoring all parameters, the system achieves high detection accuracy while keeping the device complexity manageable through selective measurement
Solution Approach 2:
The patent introduces an optical detection unit as an intermediary component that indirectly measures panel deterioration through photoluminescence emission rather than directly analyzing the liquid crystal material itself. This intermediary approach enables accurate deterioration detection through optical signals while simplifying the overall system architecture compared to direct material analysis methods
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
This method enables precise monitoring of liquid crystal panel deterioration, facilitating timely maintenance and extending the panel's lifespan by reducing further degradation.
Implementation Method 1
detecting light in a second wavelength region, which is longer than the first wavelength region, emitted from the second surface when the light in the first wavelength region is incident on the liquid crystal layer
Data Source
AI summary
A display device including a liquid crystal panel and an optical detection unit is provided. The liquid crystal panel includes a first substrate and a second substrate provided to face each other and a liquid crystal layer provided between the first substrate and the second substrate. The liquid crystal panel has a first surface directed in a normal direction of the first substrate and on which light in a first wavelength region is incident, and a second surface intersecting the first surface. The optical detection unit is configured to detect light in a second wavelength region, which is longer than the first wavelength region, emitted from the second surface when the light in the first wavelength region is incident on the liquid crystal layer.