OLED Pad Terminal Layout for High-Resolution Luminance Control
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Solution Overview
Problem
As display resolution increases, the number of pad terminals on the peripheral area of organic light emitting diode (OLED) displays grows, leading to increased resistance in wiring, which reduces luminance due to the enlarged size of the peripheral area and higher resistance in the wiring connected to pad terminals.
Innovation Solution
The solution involves designing a display device with multiple pad terminals in the peripheral area, where first and second pad terminals are arranged with different patterns, and connection wiring is optimized to reduce resistance, including the use of inclined and elongated terminal shapes to increase terminal density without increasing resistance, thereby maintaining luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pad terminals is increased to support higher display resolution, then the display resolution is improved, but the peripheral area size is increased and wiring resistance increases causing luminance reduction
Solution Approach 1:
The pad terminal region is divided into multiple terminal regions (first terminal region and second terminal region) with different patterns. This segmentation allows pad terminals to be distributed more efficiently across the peripheral area, reducing the concentration of terminals in single areas and thereby reducing wiring resistance while maintaining high display resolution support.
Solution Approach 2:
Different patterns are applied to different terminal regions rather than using a uniform pattern throughout. The first terminal region has a first pattern and the second terminal region has a second pattern, creating an asymmetric arrangement that optimizes wiring length and resistance characteristics for each region, preventing luminance reduction while supporting increased display resolution.
2Quantity of substance
If the peripheral area size is increased to accommodate more pad terminals, then the number of pad terminals is increased, but the display region shrinks
Solution Approach 1:
Different terminal regions are assigned different patterns based on their local requirements. The first terminal region and second terminal region have distinct patterns optimized for their specific positions and wiring configurations. This local quality approach allows efficient use of the peripheral area, accommodating more pad terminals without uniformly expanding the overall peripheral area size, thereby preserving display region area.
3Illumination intensity
If wiring resistance is reduced to maintain luminance, then luminance is maintained, but the peripheral area configuration becomes more complex
Solution Approach 1:
By segmenting the pad terminal region into multiple terminal regions with different patterns, the wiring paths are optimized locally in each region. This reduces wiring resistance without requiring a complete redesign of the entire peripheral area, maintaining luminance while managing complexity through modular regional design rather than overall system complexity.
Data Source
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AI summary
A display device according to an exemplary embodiment includes: a substrate including a display region configured to display an image, and a pad region positioned around the display region; and a first pad unit positioned on the pad region, wherein the first pad unit includes a first terminal region including a plurality of first pad terminals arranged in a first pattern, and a second terminal region including a plurality of second pad terminals arranged in a second pattern different from the first pattern.