Light Shielding Layer on OLED Encapsulation Substrate
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Solution Overview
Problem
Flat display devices, such as OLEDs, face a challenge where the non-display area appears semi-transparent due to dark lines, leading to a reduction in the display area and limitations in fabricating thinner devices, as increasing the outer cabinet size to cover this area encroaches on the display area.
Innovation Solution
A light shielding layer is formed on the second substrate or a heat dissipation sheet attached to the outside surface of the OLED display device to make the non-display area non-transparent, preventing the semi-transparent appearance and allowing for a thinner device design without reducing the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the outside cabinet size is increased to cover the non-display area, then the semi-transparent appearance is hidden, but the display area is reduced
Solution Approach 1:
The light shielding layer is extracted as a separate functional component from the cabinet structure. It is formed on the second substrate (encapsulation substrate) rather than being integrated into the cabinet, allowing the cabinet to maintain its original size while the non-display area is optically shielded, thus preventing display area reduction
Solution Approach 2:
The light shielding layer acts as an intermediary element between the non-display area and the viewer. This thin film layer blocks the semi-transparent appearance without requiring physical expansion of the cabinet, thereby solving the contradiction between hiding the dark line and maintaining display area
2Object-affected harmful factors
If the outside cabinet size is increased to cover the non-display area, then the semi-transparent appearance is hidden, but the device thickness is increased
Solution Approach 1:
The light shielding layer is implemented as a thin film formed on the encapsulation substrate, replacing the need for a thick cabinet extension. This thin film approach maintains the device's thin profile while effectively blocking the semi-transparent appearance of the non-display area
Solution Approach 2:
Instead of solving the semi-transparent appearance problem by expanding in the lateral dimension (increasing cabinet size), the solution moves to another dimension by applying a light shielding layer on the encapsulation substrate, thereby maintaining both thinness and effectiveness
3Object-affected harmful factors
If a light shielding layer is formed on the second substrate, then the non-display area becomes non-transparent, but the device structure becomes more complex
Solution Approach 1:
The light shielding function is merged with the encapsulation substrate (second substrate) by forming the light shielding layer directly on it. This integration combines the encapsulation and light shielding functions into a single structural element, avoiding additional complex components while achieving the desired optical effect
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 light shielding layer effectively hides the non-display area, enhancing display quality and enabling the fabrication of thinner devices by preventing the encroachment of the non-transparent area on the display area, thus improving the overall design and functionality of flat display devices.
Implementation Method 1
a light shielding layer formed on the second substrate for making the non-display area non-transparent
Data Source
AI summary
A flat display device in which a semi-transparent non-display area is processed to be non-transparent for preventing a display area from being reduced and fabricating a thinner flat display device is disclosed. The flat display device includes a first substrate having a display area with a pixel matrix formed therein and a non-display area with a driving circuit for driving the pixel matrix formed therein, a second substrate bonded to the first substrate with sealant, and a light shielding layer formed on the second substrate for making the non-display area non-transparent.