OLED Display Panel Light-Shielding Film for Laser Encapsulation
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Solution Overview
Problem
The existing frit adhesive encapsulation process for OLED display panels faces issues such as electrode scorching due to excessive laser energy and the need for precise and expensive alignment systems, as well as damage to the laser head from reflected beams, and the trapezoidal shape of the frit adhesive leading to uneven energy distribution during scanning.
Innovation Solution
A manufacturing method involving a packaging cover plate with light-shielding films having semi-transparent and light-blocking regions to prevent laser exposure on electrodes and a frosted surface to diffuse laser reflection, ensuring even energy distribution and protecting the laser head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a laser beam with diameter greater than the width of the frit adhesive is used to scan the frit adhesive, then the frit adhesive can be fully cured, but the electrode of the OLED substrate will be scorched by excessive laser energy
Solution Approach 1:
A mask plate is introduced as an intermediary component between the laser beam and the electrode. The mask plate has a light-blocking region that selectively blocks laser energy from reaching the electrode while allowing sufficient energy to pass through to cure the frit adhesive. This mediator resolves the contradiction by spatially separating the curing function from the harmful effect on the electrode.
Solution Approach 2:
The mask plate implements local quality by having different optical properties in different regions: the light-blocking region blocks laser energy to protect the electrode, while the light-transmitting region allows laser energy to pass through to cure the frit adhesive. This local differentiation of optical properties enables selective energy distribution to resolve the contradiction.
2Measurement precision
If a precise alignment system is used to support the mask plate, then the laser beam can be accurately positioned, but the equipment cost increases and the system becomes more complex
Solution Approach 1:
The mask plate is designed with self-aligning features such as positioning holes that fit into corresponding positioning posts on the packaging cover plate. This self-service alignment mechanism eliminates the need for complex external alignment systems, achieving precise positioning through the inherent structure of the components themselves.
Solution Approach 2:
The mask plate incorporates pre-designed positioning structures (positioning holes and posts) that establish accurate alignment before the laser scanning process begins. This preliminary action of pre-positioning the mask plate relative to the packaging cover plate and OLED substrate eliminates the need for complex real-time alignment systems during operation.
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 effectively prevents electrode scorching, maintains high packaging quality, reduces particle generation, and protects the laser head from damage, improving production yield and packaging efficiency.
Implementation Method 1
in an atmospheric environment, scanning the frit adhesive 300 from a side of the packaging cover plate 100 using a laser beam 950. Through the high temperature of the laser, the frit adhesive 300 is melt, cooled and cured
Implementation Method 2
a first light-shielding film and a second light-shielding film which are disposed on the main body... the first light-shielding film includes a first semi-transparent region that is completely overlapped with the first sealant thin region and a first light-blocking region that is disposed outside the first semi-transparent region
Implementation Method 3
a frosted surface to diffuse laser reflection, ensuring even energy distribution and protecting the laser head
Data Source
AI summary
An OLED display panel and manufacturing method are provided. Through disposing a light-shielding film on the packaging cover plate to prevent the laser from illuminating on the electrodes of the MED substrate during the laser scanning of the sealant to effectively protect the electrode. A portion of the light shielding film that overlaps with the thin layer region of the sealant has gradually decreasing light transmittance, which can prevent the problem that the thin layer region of the sealant is scorched by excessive laser energy, sufficiently ensures that the packaging effect, and reduces the generation of particles. In addition, the surface of the light-shielding film irradiated with laser light is a frosted surface, which can cause diffused reflection of the laser light irradiated on the light-shielding film to prevent the laser from directly reflecting on the laser head and protect the laser head from being burned and damaged.