Semi-Mesh Power Supply Lines for OLED Displays
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Solution Overview
Problem
The existing organic light emitting displays face issues with voltage changes causing vertical and horizontal crosstalk, leading to undesirable luminance differences and increased risk of burning due to mesh structures used for power supply lines, which compromise image quality and reliability.
Innovation Solution
The power supply lines are reconfigured into a semi-mesh structure with staggered connection patterns to minimize voltage changes and prevent burning, including ELVDD, ELVSS, Vint, and Vref supply lines, with specific patterns and intervals to reduce voltage drops and thermal transfer paths, thereby enhancing image quality and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mesh structure is used for power supply lines, then voltage changes are minimized, but the risk of burning increases and reliability deteriorates
Solution Approach 1:
The power supply line connection structure is segmented into main power supply lines extending in a first direction and connection patterns connecting adjacent main power supply lines in a second direction. This segmentation allows the power supply network to maintain voltage stability without requiring a complete mesh structure, thereby reducing burning risk while minimizing voltage changes.
Solution Approach 2:
The connection patterns are selectively disposed at specific locations where needed to minimize voltage changes, rather than creating a uniform mesh structure across the entire display panel. This local quality approach maintains voltage stability in critical areas while avoiding the creation of multiple potential burning points that would result from a comprehensive mesh structure.
2Area of stationary object
If ELVDD supply lines are disposed along the Y-axis direction with adjacent pixels sharing one line, then aperture ratio is improved, but voltage change increases causing vertical crosstalk
Solution Approach 1:
The power supply line structure is extended from a single-direction (Y-axis) arrangement to a two-dimensional configuration by adding connection patterns that extend in the X-axis direction. This dimensional enhancement allows voltage stabilization across the display panel without increasing the number of Y-axis supply lines, thereby maintaining aperture ratio while reducing voltage drops and vertical crosstalk.
3Manufacturing precision
If power supply lines are configured to minimize voltage change, then image quality is improved, but device complexity increases
Solution Approach 1:
The power supply line system is divided into main supply lines in the first direction and connection patterns in the second direction. This segmented approach achieves luminance uniformity through controlled voltage distribution without requiring the complexity of a full mesh structure, thereby maintaining image quality while simplifying the overall device design.
Data Source
AI summary
An organic light emitting display includes a plurality of pixels formed at crossings of data lines and gate line parts and a main power supply line part supplying a cell driving voltage to the pixels. The main power supply line part includes a plurality of main power supply lines disposed along a first direction and main power supply line connection patterns for connecting the adjacent main power supply lines along a second direction substantially perpendicular to the first direction. The main power supply line connection patterns are staggered along the second direction.