Laser Irradiation Mask for Organic Light Emitting Display Transfer
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Solution Overview
Problem
Conventional laser irradiation methods for patterning organic light emitting displays require high-intensity laser beams, which damage the organic layers and degrade the quality of the transferred patterns, especially when using the LITI method.
Innovation Solution
A laser irradiation apparatus with a mask having means to change the propagation path of the laser beam, utilizing a convex lens to refract the beam and allow low-intensity irradiation, reducing damage and improving pattern quality by concentrating high intensity only where needed for bonding breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-intensity laser beam is used to break bonding in organic layer, then transfer efficiency is improved, but organic layer is damaged and pattern quality degrades
Solution Approach 1:
The patent applies local quality by making different regions of the mask have different optical properties. The mask includes a first region that transmits laser beams and a second region with a convex lens that concentrates laser beams. This allows different parts of the organic layer to receive different laser intensities - sufficient for transfer but localized to prevent damage, thereby resolving the contradiction between transfer efficiency and pattern quality
Solution Approach 2:
The patent introduces a spatial dimension solution by using a convex lens to concentrate laser beams from a planar source into focused regions. This transforms the uniform two-dimensional laser irradiation into a three-dimensional focused beam pattern, allowing energy concentration only where needed for bonding breakage while leaving other areas at lower intensity, thus maintaining both transfer efficiency and pattern quality
2Reliability
If high-intensity laser beam is used to ensure complete transfer, then transfer completeness is improved, but energy consumption increases and organic layer damage occurs
Solution Approach 1:
The mask with differentiated regions provides local quality by allowing full laser transmission in the first region (ensuring complete transfer) while concentrating energy in specific areas through the convex lens in the second region. This localized energy concentration achieves complete transfer without requiring uniformly high energy across the entire beam path, reducing overall energy consumption while maintaining transfer completeness
Solution Approach 2:
The convex lens acts as an intermediary element that modifies the laser beam's energy distribution. It receives the laser beam and transforms its intensity profile, concentrating energy only where bonding breakage is needed. This intermediary function ensures complete organic layer transfer while minimizing total energy consumption and preventing damage to transferred patterns
3Device complexity
If uniform intensity laser beam is used for irradiation, then simplicity is maintained, but excessive energy is wasted on regions where bonding is already broken
Solution Approach 1:
The mask implements local quality by creating regions with different optical characteristics - a first region for uniform transmission and a second region with convex lens for concentrated transmission. This allows the system to maintain relative simplicity while achieving non-uniform energy distribution that prevents energy waste on areas where bonding is already broken, optimizing energy efficiency without excessive complexity
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 apparatus enables efficient transfer of organic layers with reduced damage, enhancing the quality of the patterned layers and improving the overall efficiency of the laser beam usage in the LITI method.
Implementation Method 1
A laser irradiation apparatus with a mask having means to change the propagation path of the laser beam, utilizing a convex lens to refract the beam
Implementation Method 2
the laser beam 150 is absorbed by a light-to-heat conversion layer of the donor substrate 120 and then converted to thermal energy, which allows the organic layer 130 forming a transfer layer to be transferred
Data Source
AI summary
A laser irradiation apparatus and method of fabricating an organic light emitting display using the same are provided. The laser irradiation apparatus includes: a laser generator; a mask having means for changing a propagation path of a laser beam; and a projection lens. The method of fabricating an organic light emitting display includes: irradiating a laser beam on an edge of an irradiated region of a donor substrate using the laser irradiation apparatus with high intensity to form an organic layer pattern on a substrate. The laser beam having low intensity can perform a transfer process to improve laser beam efficiency. In addition, it is possible to reduce damage on the organic layer, and improve quality of the transferred organic layer pattern.