OLED Pad Voltage Distribution via Segmented Connecting Parts
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Solution Overview
Problem
In OLED display devices, space limitations on the substrate hinder sufficient and uniform supply of driving and common voltages, leading to decreased and non-uniform brightness.
Innovation Solution
The use of an insulating substrate with strategically placed pads and connecting parts, such as metal or flexible printed circuit connecting parts, to ensure stable and even voltage distribution across the display region, including voltage supply lines and data lines, addresses the space constraints and enhances voltage supply efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the COG method is used to fix driving parts on the OLED substrate, then the driving parts can be stably positioned, but the space for pads is limited and voltage supply becomes insufficient
Solution Approach 1:
The substrate is divided into display region and non-display region, with pads strategically positioned in the non-display region. The connecting parts are segmented into multiple configurations (extending from side edges, from end edges, or both) to optimize space utilization without interfering with the COG-mounted driving parts.
Solution Approach 2:
The connecting parts extend in multiple dimensional directions (from side edges, end edges, or both) to maximize the use of available non-display region space. This multi-directional extension allows sufficient pad area while maintaining compatibility with the COG method positioning.
2Reliability
If pad space is limited due to COG method, then driving parts can be fixed stably, but voltage supply uniformity decreases
Solution Approach 1:
The connecting parts extend in multiple directions (side edges, end edges, or both) to distribute voltage supply across different regions of the display. This multi-directional voltage distribution ensures uniform voltage supply while maintaining stable positioning of COG-mounted driving parts.
Solution Approach 2:
Different regions of the substrate receive optimized voltage supply through strategically positioned connecting parts. The connecting parts can extend from specific edges to provide enhanced voltage supply to particular display regions, ensuring overall uniformity while accommodating fixed driving parts.
3Ease of operation
If pad space is reduced, then driving parts can be positioned, but overall brightness decreases
Solution Approach 1:
The connecting parts extend in multiple dimensions (from side edges, end edges, or both) to maximize voltage supply coverage. This ensures sufficient power delivery to maintain high overall brightness while allowing proper positioning of driving parts in the non-display region.
Solution Approach 2:
The substrate is segmented into display and non-display regions, with connecting parts strategically positioned in the non-display region. This segmentation allows driving parts to be properly positioned while the connecting parts provide sufficient voltage supply to maintain high brightness in the display region.
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 allows for stable and uniform voltage supply, improving the overall brightness and uniformity of the display by reducing resistance and ensuring efficient voltage transmission across the display region.
Implementation Method 1
at least one connecting part which electrically connects at least two pads or at least two portions of the pad
Data Source
AI summary
A display device includes an insulating substrate including a display region, at least one pad disposed in a non-display region on the insulating substrate which applies a voltage to the display region, a connecting part which is electrically connects at least two pads or at least two portions of the pad; and a power supply unit which applies the voltage to the pad.