Light Radiating Device for Maskless OLED Sealing
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Solution Overview
Problem
The production costs of organic light emitting diode (OLED) display devices are increased due to the need for masks to prevent damage to the organic light emitting diode region during the sealing process, and sealing defects can occur if the mask is not properly aligned or is contaminated.
Innovation Solution
A light radiating device with a light modifier having a transmissive and non-transmissive region is used to define an exposure area, allowing precise light exposure without the need for a mask, thereby reducing production costs and preventing sealing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mask is used to prevent damage to the organic light emitting diode region during laser sealing, then the organic light emitting diode region is protected from laser damage, but production costs increase and sealing defects may occur due to mask alignment issues or contamination
Solution Approach 1:
The patent removes the mask component from the sealing system entirely. Instead of using a mask to define the exposure area, the invention directly forms the frit pattern on the substrate in a predetermined shape that corresponds to the sealing region, eliminating the need for mask alignment and reducing production costs while maintaining protection of the organic light emitting diode region
Solution Approach 2:
The frit is applied in a predetermined pattern before the sealing process, defining the exact exposure area in advance. This preliminary patterning eliminates the need for mask alignment during the sealing process, preventing sealing defects and reducing production costs while ensuring the organic light emitting diode region is protected
2Manufacturing precision
If a mask is used to define the exposure area during laser sealing, then the exposure area can be controlled, but device complexity increases and productivity decreases due to mask replacement requirements
Solution Approach 1:
The mask is completely removed from the sealing process. The frit itself is formed in the precise pattern needed for sealing, eliminating mask-related complexity and the time-consuming mask replacement operations, thereby improving productivity while maintaining manufacturing precision through direct frit patterning
Solution Approach 2:
The frit application and exposure area definition functions are merged into a single step. The frit is applied directly in the predetermined sealing pattern, combining the sealing material application and the exposure mask function into one operation, eliminating the need for separate mask alignment and replacement steps
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 solution effectively reduces production costs by eliminating the need for masks and prevents sealing defects by ensuring precise light exposure, thus protecting the organic light emitting diode region during the sealing process.
Implementation Method 1
a light source to generate light
Implementation Method 2
the portion of the substrate on which the frit has been disposed is locally heated using a laser beam to melt the frit
Implementation Method 3
locally heated using a laser beam to melt the frit
Data Source
AI summary
A light radiating device capable of reducing production costs and preventing sealing defects for a display device, and a method of fabricating an organic light emitting diode (OLED) display device using the same are provided. The light radiating device includes a light source to generate light and a light modifier, including a transmissive region and a non-transmissive region, that define an exposure region on a substrate. The method includes applying a frit to at least one of a first substrate having a pixel region and a second substrate, plasticizing the frit, and aligning the first substrate, the second substrate, and a light radiating device to define an exposure region on the at least one of the first substrate and the second substrate, and radiating the light to the frit to couple the first substrate and the second substrate.