OLED Power Line Width Tapering for IR Drop Reduction
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Solution Overview
Problem
As OLED display devices increase in size, they experience intensified IR drops in power supply voltage, leading to reduced luminance, increased manufacturing costs, and dead space due to the dual bank method, which also results in inefficient operation and component deterioration.
Innovation Solution
The implementation of a power supply voltage line with a separation region and extensions that gradually decrease in width, allowing for the application of different power supply voltages to pixels, reducing voltage drops and improving luminance uniformity, while using a single power supply and electrode to mimic the dual bank method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual bank method is used to reduce IR drop in large OLED display devices, then voltage stability is improved, but device complexity and manufacturing cost increase due to multiple power supplies and data drivers
Solution Approach 1:
The power supply voltage line is divided into multiple extensions (first extension, second extension, third extension) with different widths, creating segmented voltage distribution paths that reduce IR drop without requiring multiple power supply components
Solution Approach 2:
Different portions of the power supply voltage line have different widths optimized for their specific locations - wider sections where more current is needed, narrower sections where less current flows - achieving local voltage optimization without additional components
2Illumination intensity
If a dual bank method is used to reduce IR drop, then luminance uniformity is improved, but dead space and manufacturing cost increase
Solution Approach 1:
The patent combines the functions of multiple power supplies and data drivers into a single power supply with a strategically designed voltage line structure, eliminating dead space while maintaining luminance uniformity through the segmented extension design
3Ease of manufacture
If power supply voltage line width is uniform, then manufacturing is simplified, but voltage drop increases causing luminance reduction
Solution Approach 1:
The power supply voltage line features non-uniform width distribution with first, second, and third extensions of varying widths optimized for their respective locations, reducing voltage drop through localized impedance control while remaining manufacturable
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 solution reduces IR drops, improves luminance uniformity, decreases manufacturing costs, and minimizes dead space by efficiently managing power supply voltage across the OLED display device.
Implementation Method 1
The first extension has a width that gradually decreases along the first direction
Implementation Method 2
The third extension has a width that gradually decreases along the third direction
Data Source
AI summary
An organic light emitting diode display device includes a display panel and a power supply. The power supply applies a first power supply voltage and a second power supply voltage to a first power supply voltage line. The first power supply voltage line includes a first extension, a second extension, and third extension. The first extension is disposed along a first direction from the first side portion to the second side portion. The first extension has a width that gradually decreases along the first direction. The second extension is disposed along a second direction that is perpendicular to the first direction. The third extension is disposed along a third direction that is opposite to the first direction. The third extension has a width that gradually decreases along the third direction.