OLED Display Laser Repair Optics to Protect the Cathode
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Solution Overview
Problem
Light emitting display devices face issues with cathode damage during laser repair due to unintended energy concentration, leading to reduced lifespan and reliability.
Innovation Solution
The device incorporates a lens and a cap electrode pattern to refract and reflect laser light, preventing it from reaching the cathode by converging it on the anode extension part, thereby protecting the cathode from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If laser light is radiated to repair defective sub-pixels, then repair effectiveness is improved, but cathode damage occurs due to energy concentration
Solution Approach 1:
The patent introduces a lens as an intermediary component between the laser light source and the cathode. This lens refracts the laser light to converge it on the anode extension part rather than allowing it to reach the cathode directly. The lens acts as a mediator that redirects the harmful laser energy to a safe target area, enabling repair while protecting the cathode from damage.
Solution Approach 2:
The patent converts the harmful concentrated laser energy that would damage the cathode into a beneficial tool for repairing the anode extension part. By using the lens to focus the laser light on the anode extension part, the same high-energy laser beam that poses a threat to the cathode becomes an effective means for separating defective sub-pixels, thus transforming a harmful factor into a useful one.
2Manufacturing precision
If laser light is focused on a small area for precise repair, then repair precision is improved, but energy concentration increases causing cathode damage
Solution Approach 1:
The lens serves as an intermediary optical element that controls the convergence of laser light. It enables precise focusing of laser energy on the anode extension part while simultaneously preventing the focused energy from reaching the cathode. The lens mediates between the need for precise energy delivery and the need to protect sensitive components, achieving both repair precision and device reliability.
3Ease of repair
If the anode extension part is separated from the emission part, then repairability is improved, but device complexity increases due to additional structures
Solution Approach 1:
The patent divides the anode into two separate parts: the emission part and the anode extension part. This segmentation allows the anode extension part to be selectively removed during repair of defective sub-pixels without affecting the functional emission part. The segmentation enables independent handling of different anode regions, improving repairability while maintaining the integrity of the operational display area.
Solution Approach 2:
The lens acts as an intermediary structure that facilitates the separation function. By positioning the lens to converge laser light on the anode extension part, it enables clean separation between the emission part and the removable extension part. The lens mediates the energy delivery to achieve precise separation without damaging other components, thus enabling repairability with minimal additional 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
This configuration effectively reduces cathode damage, enhances device reliability, and maintains luminous efficacy by dispersing light energy away from the cathode.
Implementation Method 1
a lens at a part of the non-emission part on the substrate... refract and reflect laser light
Implementation Method 2
a cap electrode pattern provided on the anode and overlapping with the lens... reflect laser light
Data Source
AI summary
A light emitting display device capable of vertically and horizontally adjusting an area where the energy of light is concentrated when laser light for repair is radiated, the adjusted area corresponds to an anode separation region, so that normal repair can be performed and damages on a cathode caused by energy concentration can be prevented by changing a structure under the cathode.