Electroluminescence Display Driver Circuit Layout Optimization
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Solution Overview
Problem
Existing electroluminescence display devices face challenges in reducing the width of the frame portion between the display region and the panel substrate due to the layout of power supply lines, which limits integration into various devices and increases power consumption.
Innovation Solution
The layout of power supply lines is optimized by placing the horizontal and vertical scan driver circuits at the periphery of the display panel, with a common external connection terminal and power supply lines extending directly to these circuits without passing through other sides, allowing for a minimized line distance and reduced number of terminals and lines, thereby reducing the panel's edge size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power supply lines are extended through multiple sides of the panel to connect driver circuits, then the driver circuits can be positioned at the periphery, but the line distance increases causing higher power consumption and voltage drop
Solution Approach 1:
The patent applies preliminary action by strategically positioning the external connection terminal and planning the power supply line routes in advance during the design phase. The terminal is placed on a specific side (first side) and lines are routed through predetermined paths (second and third sides) to minimize distance. This pre-planned configuration ensures that driver circuits can be positioned at the periphery while maintaining optimal line lengths, thereby reducing power consumption and voltage drop before the device is manufactured.
2Ease of operation
If power supply lines are extended through multiple sides of the panel, then driver circuits can be connected, but the number of terminals and lines increases complicating the structure
Solution Approach 1:
The patent applies merging by consolidating multiple power supply connections into a single external connection terminal. Instead of providing separate terminals for each driver circuit, both the horizontal scan driver circuit and vertical scan driver circuit share the same external connection terminal on the first side. The power supply lines are routed through common paths (second and third sides), reducing the total number of terminals and simplifying the overall structure while maintaining proper connectivity to all driver circuits.
3Adaptability or versatility
If the frame portion width is reduced for better integration, then display device flexibility improves, but power supply line layout becomes more constrained
Solution Approach 1:
The patent applies dimensionality change by utilizing the peripheral sides (second and third sides) of the panel for power supply line routing instead of extending lines across the entire panel area. By positioning the external connection terminal on the first side and routing lines through the second and third sides to reach driver circuits on the fourth side, the design efficiently uses the panel's dimensional space. This approach minimizes the required frame portion width while maintaining manufacturability, as lines do not need to traverse long distances across the display area.
Data Source
AI summary
In an electroluminescence display device having, on a display panel, a display portion in which pixels are arranged in matrix, an external connection terminal is placed along a lateral side of the display panel and a vertical scan driver circuit is placed on a lateral side of the display panel which opposes the lateral side on which the external connection terminal is placed. Lines for a horizontal scan driver circuit and for the vertical scan driver circuit can be provided only on three sides of the display panel including the side on which the external connection terminal is provided, a side opposing this side, and another side. By not placing the line for the driver circuits on the remaining side, spaces can be secured on this side for a drive current line which supplies power to an electroluminescence element. With this structure, a size of a frame portion can be reduced while securing sufficient width for the drive current common line.