Display Device Dummy Line Routing for Non-Display Area Reduction
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Solution Overview
Problem
The increase in the number of data lines in display devices to improve resolution leads to a wider non-display area, resulting in a decrease in the display area ratio and deteriorated display quality.
Innovation Solution
A display device design featuring a substrate with a main region and a sub-region, including a circuit array layer with data lines, dummy lines, and power supply lines, where the data lines are optimized to reduce the width of the non-display area without compromising resolution, using a configuration of first and second dummy lines and auxiliary lines to connect data supply lines efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of data lines is increased to improve resolution, then the resolution is improved, but the width of the non-display area increases and the display area ratio decreases
Solution Approach 1:
The patent introduces dummy lines extending in a direction intersecting the data lines (first direction) while data lines extend in a second direction. This creates a two-dimensional grid-like arrangement where dummy lines are disposed between adjacent data lines, effectively utilizing the vertical space between horizontal data lines to reduce the horizontal width of the non-display area required for data supply line arrangement.
Solution Approach 2:
The dummy lines are nested within the space between adjacent data lines in the display area, rather than requiring separate external routing space. The dummy lines are positioned to overlap with the region between data lines when viewed from above, effectively nesting the dummy line routing within the existing data line spacing to minimize additional space requirements.
2Measurement precision
If data supply lines are arranged to connect increased data lines, then resolution is maintained, but the width of the non-display area increases
Solution Approach 1:
Instead of arranging dummy lines only in the horizontal direction parallel to data lines, the patent introduces dummy lines extending in a vertical direction (first direction) intersecting the data lines. This allows data supply lines to be routed more efficiently by utilizing the vertical dimension, reducing the horizontal width of the non-display area needed for connections.
Solution Approach 2:
The dummy lines are selectively positioned between specific adjacent data lines where routing is needed, rather than uniformly distributing them across the entire display area. This localized placement optimizes the routing paths for data supply lines connecting to the display driving circuit, minimizing the overall non-display area width.
3Area of stationary object
If dummy lines are added to reduce non-display area width, then display area ratio is improved, but device complexity increases
Solution Approach 1:
The dummy lines serve multiple functions: they act as electrical connections between data supply lines and data lines, serve as routing paths for signals and power, and function as spacing elements to maintain proper geometric relationships between data lines. This multi-functionality reduces the need for separate dedicated structures for each purpose, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent combines the routing function and the connection function into a single dummy line structure. The dummy lines simultaneously provide signal/power routing paths and establish electrical connections between data supply lines and data lines, merging multiple circuit functions into one element to avoid the complexity of separate structures.
Data Source
AI summary
A display device comprises a substrate; a circuit array layer comprising pixel drivers, data lines, first dummy lines, and second dummy lines; and a light emitting array layer. The display area comprises middle, first side, and second side regions. The data lines comprise first, second, and third data lines disposed in the middle, first side, and second side regions, respectively. The first dummy lines comprise a first data detour line disposed in the first side region and adjacent to a part of the second data line, and auxiliary lines. The second dummy lines comprise a second data detour line configured to connect the first data detour line to the third data line, and additional lines. The auxiliary lines comprise a bias auxiliary line to which a bias power is applied; and a second power auxiliary line to which a second power is applied.