OLED Display Wiring Structure for Low-Resistance High-Speed Driving
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Solution Overview
Problem
Current display devices face challenges in achieving high-quality image display due to limitations in the design and manufacturing of their wiring layers and encapsulation structures, which affect the electrical resistance and durability of the devices.
Innovation Solution
The display device incorporates a unique wiring layer structure with a pattern insulating layer and a thin-film encapsulation layer, including a combination of inorganic and organic layers, to reduce electrical resistance and enhance durability, while also optimizing the connection between wiring layers and electrodes for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single wiring layer is used, then the device structure is simple, but the electrical resistance is high and driving speed is limited
Solution Approach 1:
The wiring structure is divided into multiple layers (first wiring layer and second wiring layer) with different functions. The first wiring layer provides signal routing while the second wiring layer provides low-resistance connection, segmenting the wiring functions to achieve both high speed and controlled complexity
Solution Approach 2:
The patent transitions from a single-plane wiring layout to a three-dimensional multi-layer wiring structure. By adding the vertical dimension with stacked wiring layers and connecting them through contact holes and connection electrodes, the patent achieves reduced electrical resistance and improved driving speed while maintaining manageable complexity through systematic layer design
2Reliability
If conventional encapsulation is used, then the manufacturing process is simple, but the protection against moisture and oxygen is insufficient
Solution Approach 1:
The encapsulation structure uses composite materials with different properties: inorganic encapsulation layers provide barrier protection against moisture and oxygen penetration, while organic encapsulation layers provide flexibility and stress relief. This composite approach achieves superior protection reliability while managing the complexity through complementary material functions
Solution Approach 2:
The encapsulation is divided into multiple discrete layers (first inorganic, organic, second inorganic) rather than using a single encapsulation layer. Each layer serves specific protective functions, and the segmented structure allows for better control of protection mechanisms while maintaining a systematic manufacturing process
3Area of stationary object
If wiring layers are closely spaced, then the device area is reduced, but the electrical resistance increases
Solution Approach 1:
By utilizing the vertical dimension with stacked wiring layers, the patent reduces the horizontal area required for wiring while maintaining low electrical resistance through the third dimension. The multi-layer structure allows compact area utilization without compromising electrical performance
Solution Approach 2:
The patent merges routing and low-resistance connection functions into an integrated multi-layer wiring system. The first and second wiring layers work together as a unified structure, achieving both area efficiency and low electrical resistance through combined functionality rather than separate systems
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
A display device includes: a substrate (110); a first thin film transistor (T1) and a second thin film transistor (T2) arranged over the substrate; a display element (OLED) connected to the first thin film transistor (T1); a wiring (WL) connected to the second thin film transistor (T2) and including a first wiring layer (DL1) and a second wiring layer (DL2); a pattern insulating layer (114a) arranged between the first wiring layer and the second wiring layer; a planarization layer (117) covering the wiring; and a connection electrode (CM) arranged on the planarization layer and connected to the first wiring layer and the second wiring layer respectively through a first contact hole (CNT1) and a second contact hole (CNT2).