Light-Emitting Pixel Layout for Safe Laser Drilling in Displays
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Solution Overview
Problem
Current light emitting display devices face challenges in maintaining uniformity and longevity of light emitting regions, particularly in high-resolution displays where laser drilling for power application can lead to damage and reduced lifespan due to the proximity of light emitting layers.
Innovation Solution
The design incorporates a light emitting display device with a unit pixel group comprising multiple light emitting layers, where a laser drilling position is strategically formed to allow for power application while maintaining a distance from the light emitting layers, using modified and normal light emitting layers with grooves to ensure equal area distribution and prevent damage during laser drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If laser drilling is performed close to light emitting layers to apply power to cathode, then power application efficiency is improved, but light emitting layers are damaged and lifespan is reduced
Solution Approach 1:
The light emitting layer is divided into multiple segments: normal light emitting layers that maintain full area for light emission, and modified light emitting layers with grooves that create safe zones for laser drilling. This segmentation allows the laser to drill through the modified layer without damaging the normal light emitting layers, thus maintaining both power application efficiency and light emitting layer integrity.
Solution Approach 2:
Different regions of the light emitting layer are given different properties. The modified light emitting layer has grooves that make it suitable for laser drilling, while the normal light emitting layers remain intact for optimal light emission. This local differentiation allows the system to achieve both good power application and preserved light emitting quality.
2Ease of manufacture
If laser drilling position is formed in unit pixel group, then space for voltage transmission is secured, but light emitting layer area is reduced
Solution Approach 1:
The light emitting layer is segmented into modified and normal regions. The modified light emitting layer with grooves is specifically positioned to accommodate laser drilling, while the normal light emitting layers maintain their full area. This ensures voltage transmission space is secured without significantly reducing the overall light emitting area.
Solution Approach 2:
Only a portion of the light emitting layer is modified with grooves, rather than the entire layer. This partial modification provides the necessary space for laser drilling while preserving the majority of the light emitting layer area for optimal light emission performance.
3Reliability
If modified light emitting layers with grooves are used, then laser drilling damage is prevented, but manufacturing complexity increases
Solution Approach 1:
The grooves are pre-formed in the modified light emitting layer during the manufacturing process, before laser drilling is performed. This preliminary action creates a safe pathway for the laser, preventing damage to the light emitting layer while adding only moderate manufacturing complexity through the groove formation step.
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 approach enables the creation of high-resolution displays with uniform light emission and extended lifespan of light emitting devices by preventing damage during laser drilling and ensuring consistent power application across the cathode.
Implementation Method 1
a laser drilling position is formed in a part of the unit pixel group
Data Source
AI summary
A light emitting display device includes: a unit pixel group having at least two unit pixels, wherein a unit pixel includes first, second, and third light emitting layers respectively corresponding to three primary colors, the first light emitting layer includes two first light emitting layers in one unit pixel, a laser drilling position is formed in one part of the unit pixel group, the second and third light emitting layers adjacent to the laser drilling position are formed of second and third modified light emitting layers, respectively, including grooves, the second and third light emitting layers do not include grooves, areas of the second modified light emitting layer and the second normal light emitting layer are the same, and areas of the third modified light emitting layer and the third normal light emitting layer are the same.