Blocking Unit Shields OLED Organic Film From Laser Curing Damage
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Solution Overview
Problem
Existing display devices face challenges in preventing damage from laser light during the manufacturing process, particularly in organic light emitting diode (OLED) displays, where laser curing can inadvertently harm the organic film, and there is a need to protect signal lines from static electricity-induced damage.
Innovation Solution
Incorporating a blocking unit on the display device's substrate, spaced apart from signal lines with sensing pads in between, which is connected to a ground pad to redirect static electricity and prevent laser light from damaging the organic film by blocking it from regions other than the coupling unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser light is used to cure the coupling unit, then the coupling unit is effectively cured and substrates are sealed, but the organic film may be damaged by laser light
Solution Approach 1:
A blocking unit is introduced as an intermediary element between the laser light source and the organic film. This blocking unit selectively absorbs or blocks laser light in specific regions, allowing the coupling unit to be cured effectively while preventing laser light from reaching and damaging the organic film in non-coupling areas
Solution Approach 2:
The blocking unit is designed with spatially varying properties - it is positioned only in regions where laser light protection is needed, while allowing laser light to pass through in coupling unit regions. This local differentiation enables simultaneous curing of coupling units and protection of organic film without compromising either function
2Ease of operation
If signal lines are placed on the second substrate, then electrical signals can be transmitted, but signal lines are vulnerable to static electricity damage
Solution Approach 1:
Sensing pads are introduced as intermediary elements between the signal lines and the external environment. These sensing pads serve as the first point of contact for external objects, intercepting static electricity before it can reach and damage the signal lines
Solution Approach 2:
The vulnerable signal lines are extracted from direct exposure to external factors by placing sensing pads in front of them. The sensing pads are positioned to overlap the coupling unit in plan view, creating a protective barrier that separates the signal lines from potential static electricity sources
3Reliability
If sensing pads overlap the coupling unit, then static electricity protection is improved, but manufacturing precision requirements increase
Solution Approach 1:
The sensing pads are designed to serve multiple functions simultaneously: they provide static electricity protection for signal lines, and their positioning relative to the coupling unit serves as a universal reference that simplifies manufacturing alignment. By defining the sensing pad position in relation to the coupling unit (which has a specific function and position), the design creates a self-referential alignment system that reduces manufacturing precision requirements
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 blocking unit effectively prevents damage to the organic film and signal lines, enhancing the manufacturing efficiency, reducing costs, and improving the overall reliability of the display device by safeguarding against laser light and static electricity.
Implementation Method 1
The coupling unit is irradiated with laser light to cure the coupling unit and laminate-seal the first substrate and the second substrate
Implementation Method 2
a blocking unit... which is connected to a ground pad to redirect static electricity and prevent laser light from damaging the organic film by blocking it from regions other than the coupling unit
Data Source
AI summary
Provided is a display device including a first substrate, a second substrate disposed on the first substrate and including a first surface and a second surface, a display unit disposed between the first substrate and the second substrate, a coupling unit disposed between the first substrate and the second substrate and coupled to the first substrate and the first surface of the second substrate, input sensing electrodes disposed on the second surface of the second substrate, signal lines disposed on the second surface of the second substrate and connected to the input sensing electrodes, sensing pads disposed on the second surface of the second substrate, overlapping the coupling unit in a plan view, and connected to the signals lines, and a blocking unit disposed on the second surface of the second substrate and spaced apart from the signals lines with the sensing pads interposed therebetween viewed in a plan view.