Organic Electroluminescent Display Gate Line Resistance Reduction
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Solution Overview
Problem
As organic electroluminescent displays increase in size, the length of signal lines required to transmit signals to pixels also increases, leading to increased resistance and signal delay, which deteriorates display quality.
Innovation Solution
The implementation of a structure that includes a first substrate with a pixel, a gate line, a data line, a switching transistor, a driving transistor, and a storage capacitor, where the gate line and gate electrodes are formed with different materials and processes, allowing for reduced resistance and increased thickness of the gate line without affecting the gate electrode thickness, and a storage capacitor design that reduces size while maintaining capacitance, thereby enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the length of signal lines is increased to accommodate larger display sizes, then the display area is improved, but the resistance increases and signal delay occurs, deteriorating display quality
Solution Approach 1:
The patent changes the physical parameters of the gate line by using a different material composition and increasing the thickness of the gate line specifically in the signal transmission regions. This parameter change reduces the resistance of the gate line, allowing larger display areas to be maintained without suffering from signal delay and quality deterioration.
2Reliability
If the thickness of the gate line is increased to reduce resistance, then the signal transmission is improved, but the gate electrode thickness must be maintained, creating manufacturing complexity
Solution Approach 1:
The patent segments the gate structure into two distinct parts: the gate electrode and the gate line. The gate electrode maintains its original thickness for transistor operation, while the gate line is extended with additional thickness specifically for signal transmission regions. This segmentation allows each part to be optimized independently without affecting the other.
Solution Approach 2:
The patent applies local quality by making the gate line thickness non-uniform - thinner under the transistor region and thicker in the signal transmission region. This localized thickness variation reduces resistance where needed without affecting the gate electrode functionality, simplifying the manufacturing process compared to uniformly thickening the entire gate structure.
3Area of stationary object
If the size of the storage capacitor is reduced to increase pixel area, then the light emission area is improved, but the capacitance must be maintained, requiring innovative capacitor structure
Solution Approach 1:
The patent transitions from a planar two-electrode capacitor structure to a three-dimensional stacked structure with multiple electrodes and insulating layers. By utilizing the vertical dimension with alternating conductive and insulating layers, the capacitor achieves higher capacitance density, allowing reduced footprint while maintaining required capacitance values.
Data Source
AI summary
An organic electroluminescent display includes a first substrate, a pixel, a gate line, a data line, a switching transistor, a power signal line, a driving transistor, and a storage capacitor. The storage capacitor includes first, second, and third electrodes. The first electrode is on the first substrate, and the second electrode includes the same material as the gate line. The second electrode is on the first electrode and insulated from the first electrode. The third electrode is insulated from and on the second electrode, and the third electrode is insulated from the first electrode.