OLED Display Panel Signal Line Routing for Dark Spot Reduction
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Solution Overview
Problem
Current OLED display technologies face challenges in achieving seamless integration of light-emitting devices and driving circuits, leading to gaps between first and second light-emitting devices that result in dark spots and reduced display effectiveness due to insufficient light transmittance and increased pixel spacing.
Innovation Solution
The design incorporates a display panel with first and second display areas, where the second display area includes a signal line that overlaps with the gap between the first and second light-emitting devices, reducing the minimum width of the gap and enhancing light transmittance by optimizing the arrangement of light-emitting devices and driving circuits, allowing for improved display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the signal line is positioned in the first display area, then the driving circuit can be easily coupled to light-emitting devices, but the gap between light-emitting devices increases causing dark spots and reduced light transmittance
Solution Approach 1:
The signal line is repositioned from the first display area to the second display area, utilizing the unused non-display region. This spatial relocation in a different functional area resolves the conflict by allowing the signal line to extend along the edge of the second display area without interfering with the light-emitting devices in the first display area, thereby eliminating dark spots while maintaining electrical coupling capability
Solution Approach 2:
The second display area serves as an intermediary zone that hosts the signal line and pixel driving circuits. This intermediary region acts as a buffer zone that separates the driving circuitry from the light-emitting devices, allowing signal transmission without creating gaps in the display area and thus preventing dark spot formation
2Device complexity
If pixel spacing is increased to accommodate driving circuits, then circuit integration is simplified, but display resolution and effectiveness are reduced
Solution Approach 1:
The display panel is segmented into two distinct functional areas: the first display area for high-resolution light-emitting devices and the second display area for driving circuits and signal lines. This segmentation allows each area to be optimized independently, maintaining high pixel density in the display region while providing adequate space for circuit integration in the non-display region
Solution Approach 2:
The driving circuits are relocated to the second display area, utilizing the unused non-display region. This dimensional relocation separates the circuit integration space from the pixel array space, allowing high-resolution display without compromising circuit functionality, as the circuits operate in a separate spatial zone
3Illumination intensity
If the gap between light-emitting devices is reduced to eliminate dark spots, then light coverage is improved, but the space for signal line routing and circuit placement is constrained
Solution Approach 1:
The second display area serves as an intermediary zone that provides dedicated space for signal lines and pixel driving circuits. By positioning these components in the non-display region, the patent creates a buffer zone that accommodates circuit complexity without encroaching on the light-emitting device spacing in the first display area, thus eliminating dark spots while maintaining routing flexibility
Solution Approach 2:
Signal lines are routed through the second display area, utilizing the unused non-display region for signal transmission. This dimensional relocation of signal routing paths allows minimal gap width between light-emitting devices in the first display area, as the signal lines no longer need to traverse through the display area but can instead use the adjacent non-display area as a conduit
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 configuration reduces the visibility of dark spots and improves display effectiveness by minimizing the gap between light-emitting devices, ensuring better light coverage and maintaining high resolution, even when the second display area is not actively displaying.
Implementation Method 1
Organic light-emitting diodes (OLEDs) are also referred to as organic electroluminescent displays or organic light-emitting semiconductors
Data Source
AI summary
A display panel includes a substrate, first light-emitting devices located in a first display area, a first driving circuit, second light-emitting devices located in a second display area, and a second driving circuit. The first driving circuit is configured to actively drive the first light-emitting devices to emit light, and includes a plurality of pixel driving circuits and a signal line. The signal line is located in the second display area, and extends along an edge of the second display area. An orthographic projection of the signal line on the substrate and an orthogonal projection of the first display area on the substrate have a gap therebetween. The second driving circuit is configured to passively drive the second light-emitting devices to emit light. An orthographic projection of at least one of the second light-emitting devices on the substrate is overlapped with an orthogonal projection of the gap on the substrate.