Liquid Crystal Panel Blue-Light Fluorescence Detection
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Solution Overview
Problem
Projection-type display devices using liquid crystal panels are prone to degradation due to high-intensity light emission, necessitating efficient detection methods to prevent panel degradation.
Innovation Solution
A display device with a light source, liquid crystal panel, and light detection unit that irradiates the peripheral region of the liquid crystal layer with a specific wavelength band and detects longer wavelength light emitted from the panel to monitor degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-intensity light is emitted onto the liquid crystal panel from the light source, then the brightness and visibility of the display are improved, but the liquid crystal panel is degraded due to photochemical reactions and molecular alignment disruption
Solution Approach 1:
The patent applies preliminary action by irradiating the peripheral region of the liquid crystal layer with light before the display region to prevent degradation. The light irradiation unit emits light in the blue wavelength range (480-520nm) to the peripheral region, which contains degraded liquid crystal molecules, causing them to emit fluorescence. This allows early detection and preventive maintenance before the degradation affects the display region, thus maintaining panel reliability while allowing high-intensity light operation for brightness.
2Measurement precision
If the display region is monitored for degradation, then timely detection is achieved, but the peripheral region where degradation first occurs is overlooked
Solution Approach 1:
The patent applies segmentation by dividing the liquid crystal layer into two distinct regions: the display region and the peripheral region. The light irradiation unit specifically targets the peripheral region, while the light detection unit monitors both regions. This segmentation allows the system to focus detection efforts on the peripheral region where degradation first occurs, improving measurement precision for early degradation detection while maintaining ease of operation through automated regional monitoring.
Solution Approach 2:
The patent uses fluorescence emission as an intermediary indicator to detect degradation. Degraded liquid crystal molecules in the peripheral region emit fluorescence when irradiated with blue light (480-520nm). The light detection unit detects this fluorescence, which serves as an intermediary signal that indirectly indicates degradation without requiring direct contact or complex measurement equipment, thus improving both measurement precision and ease of operation.
3Measurement precision
If the entire liquid crystal layer is irradiated with detection light, then comprehensive degradation detection is achieved, but the liquid crystal panel performance is affected due to additional light exposure
Solution Approach 1:
The patent applies local quality by making the light irradiation localized to the peripheral region only, rather than irradiating the entire liquid crystal layer. The light irradiation unit is positioned to emit light specifically at the peripheral region where degradation first occurs. This localized approach maintains measurement precision for degradation detection while minimizing additional light exposure to the display region, thus preserving panel performance and productivity.
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
Accurately detects liquid crystal panel degradation, allowing for timely maintenance and reducing the impact on the panel's performance and service life.
Implementation Method 1
a light detection unit configured to detect light of a long wavelength band longer than the first wavelength band emitted from the portion of the liquid crystal layer
Data Source
AI summary
A display device includes a light source; a liquid crystal panel including a display region on which light emitted from the light source is incident, the display region including a first substrate and a second substrate provided facing each other, and a liquid crystal layer provided between the first substrate and the second substrate, and a peripheral region in periphery of the display region; a light irradiation unit configured to irradiate a portion of the liquid crystal layer overlapping the peripheral region as viewed in a normal direction of the first substrate, with light of a first wavelength band; and a light detection unit configured to detect light of a long wavelength band longer than the first wavelength band emitted from the portion of the liquid crystal layer, when the light irradiation unit irradiates the portion of the liquid crystal layer with the light of the first wavelength band.