Display Device Circuit Layout for Narrower Non-Display Areas
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Solution Overview
Problem
The width of the non-display area in display devices is increased due to the presence of signal pads and circuit boards, reducing the ratio of the display area and deteriorating display quality.
Innovation Solution
A display device design that includes a sub-region protruding from the non-display area with a bending area allowing the circuit board to be disposed on the rear surface, and power connection portions between stages of the gate driver adjacent to the curved corner, reducing the non-display area width without compromising the number of signal pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal pads are disposed on one side of the non-display area, then the circuit board can be electrically connected to the display panel, but the width of the non-display area increases, reducing the display area ratio
Solution Approach 1:
The patent introduces a sub-region protruding from the non-display area in a direction perpendicular to the first side, creating a three-dimensional arrangement. The circuit board is disposed on the rear surface of the substrate at this sub-region, effectively utilizing the depth dimension to reduce the lateral width requirement of the non-display area while maintaining electrical connection reliability through the signal pads.
2Area of stationary object
If a bending area is introduced to allow the circuit board to be disposed on the rear surface, then the non-display area width can be reduced, but the curvature of the bending area is limited by the threshold to prevent bending line disconnection or short-circuiting
Solution Approach 1:
Instead of increasing curvature in the bending area, the patent resolves the contradiction by moving to another dimension - introducing a sub-region that protrudes from the non-display area. This allows the circuit board to be positioned on the rear surface without requiring excessive curvature, thereby maintaining bending line integrity while reducing the effective non-display area width.
3Area of stationary object
If the width of the bending area is increased to reduce non-display area width, then the display area ratio can be increased, but the curvature threshold for preventing bending line defects is exceeded
Solution Approach 1:
The patent achieves increased display area ratio without exceeding curvature thresholds by utilizing the depth dimension through the protruding sub-region. The circuit board is disposed on the rear surface at this sub-region, allowing the bending area width to be kept within safe limits while still achieving the desired reduction in non-display area width and increase in display area ratio.
Data Source
AI summary
Provided is a display device including a substrate, a circuit layer disposed on a first surface of the substrate, a light emitting element layer, and a circuit board disposed on a second surface of the substrate. The circuit layer includes pixel drivers, gate lines, a first power supply line and a second power supply line respectively transmitting a first power and a second power, and a gate driver including stages electrically connected to the gate lines, respectively. The second power supply line is electrically connected to the circuit board through power connection portions. The power connection portions are disposed between a number of the stages adjacent to a curved corner of the substrate among the stages of the gate driver.