OLED Zigzag Organic Patterns Aperture Ratio
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Solution Overview
Problem
The existing organic electroluminescent display (OLED) devices face limitations in aperture ratio and resolution due to the shadowing effect caused by the arrangement of organic patterns in sub-pixel regions, which results in a reduced lifetime and efficiency of the devices as the resolution increases.
Innovation Solution
The OLED device employs a zigzag arrangement of organic patterns in sub-pixel regions, with each pattern occupying both upper and lower halves of the sub-pixel areas, allowing for increased spacing and reduced shadowing, thereby enhancing the aperture ratio and resolution without the shadowing effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic patterns are arranged in sub-pixel regions with standard spacing, then device structure is simple, but aperture ratio is reduced due to shadowing effect
Solution Approach 1:
The patent applies asymmetry by implementing a staggered arrangement where odd-numbered and even-numbered organic patterns are positioned at different vertical locations within sub-pixel regions. This asymmetric configuration eliminates the shadowing effect between adjacent patterns while maintaining manufacturing simplicity, thereby improving aperture ratio without complicating the fabrication process.
2Area of stationary object
If organic patterns are spaced apart to prevent shadowing effect, then aperture ratio improves, but resolution is reduced due to increased dead zone
Solution Approach 1:
The patent transitions from one-dimensional horizontal spacing to two-dimensional staggered positioning. By arranging organic patterns at different vertical levels (odd patterns in lower halves, even patterns in upper halves), the solution prevents shadowing without requiring increased horizontal dead zones, thus maintaining high resolution while improving aperture ratio.
3Manufacturing precision
If resolution is increased, then pixel density improves, but shadowing effect increases leading to reduced device lifetime
Solution Approach 1:
The asymmetric staggered arrangement separates overlapping emission regions of adjacent organic patterns by positioning them at different vertical levels. This eliminates the shadowing effect that would otherwise intensify with higher resolution, thereby extending device lifetime while maintaining high pixel density and resolution.
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 improves the aperture ratio and resolution of the OLED device, leading to increased pixel density and extended device lifetime by minimizing the dead zone and optimizing the organic emission layer area.
Implementation Method 1
the organic ELD device emits a light using an organic electroluminescent diode
Implementation Method 2
the evaporated organic material is deposited on the substrate
Implementation Method 3
an organic emission layer including the HIL 37, the HTL 33, the EML 40, the ETL 35 and the EIL 39 may be fabricated through a vacuum thermal evaporation method
Data Source
AI summary
An organic electroluminescent display device includes: first and second substrates facing and spaced apart from each other, the first and second substrates including at least one pixel region having first, second and third sub-pixel region; a gate line and a data line on the first substrate, the gate line and the data line crossing each other to define the at least one pixel region; a first electrode on the first substrate in each of the first, second and third sub-pixel regions; first, second and third organic patterns on the first electrode in the first, second and third sub-pixel regions, respectively, the first, second and third organic patterns having a zigzag shape along a first direction parallel to the gate line with respect to a virtual line passing through a central portion of each of the first, second and third sub-pixel regions; and a second electrode on the first, second and third organic patterns.