Phase Retardation Layer for Glass Substrate Crack Detection
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in detecting and preventing cracks on glass substrates, particularly in non-display areas, which can lead to reduced durability and reliability.
Innovation Solution
Incorporating a phase retardation layer under the glass substrate in the organic light emitting display device, which compensates for light retardation and facilitates the detection of cracks, thereby enhancing the device's durability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a glass substrate is used to ensure ease of manufacturing and stiffness, then manufacturing ease and structural stability are improved, but crack detection capability deteriorates
Solution Approach 1:
A phase retardation layer is introduced as an intermediary component between the light source and the glass substrate. This layer modifies the optical path of light passing through the glass, creating detectable interference patterns when cracks are present. The mediator enables crack detection without replacing the glass substrate itself, thus maintaining manufacturing ease while improving detection capability.
Solution Approach 2:
The phase retardation layer utilizes optical interference effects that manifest as visible color changes or brightness variations when light passes through cracked regions of the glass substrate. These optical changes provide a visual indicator of crack presence, transforming the invisible structural defect into a detectable optical signal.
2Adaptability or versatility
If the glass substrate thickness is reduced to achieve flexibility, then flexibility is improved, but crack resistance deteriorates
Solution Approach 1:
The phase retardation layer is pre-installed on the glass substrate before final assembly. This preliminary configuration allows the optical detection system to be ready in advance, enabling immediate detection of any cracks that may develop during subsequent handling or operation, thereby compensating for the reduced crack resistance of thinner glass.
3Device complexity
If conventional methods are used for crack detection, then device simplicity is maintained, but detection precision deteriorates
Solution Approach 1:
The invention replaces complex mechanical or visual inspection methods with an optical detection system based on phase retardation. Light passing through the phase retardation layer and cracked glass creates interference patterns that can be detected optically, providing higher precision without requiring complex mechanical scanning or contact-based inspection 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
The phase retardation layer enables effective detection of minute cracks on the glass substrate, preventing their propagation and improving the overall durability and reliability of the display device.
Implementation Method 1
a phase retardation layer disposed under the glass substrate
Implementation Method 2
compensates for light retardation and facilitates the detection of cracks
Data Source
AI summary
An organic light emitting display is disclosed. The organic light emitting display includes a glass substrate, an organic light emitting element on the glass substrate, and a phase retardation layer disposed under the glass substrate. Accordingly, a crack created on the glass substrate can be readily detected, ensuring improvement in the durability and reliability of the display device.