OLED Display Panel Signal Line Layout for Reduced Light Scattering
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Solution Overview
Problem
In organic light-emitting display technology, the uneven surface caused by signal lines beneath the organic light-emitting diodes leads to uneven light dispersion, affecting display quality due to scattered light being easily caught by the viewer's eyes.
Innovation Solution
The display panel design includes signal lines with overlapping portions that form specific angles with the light-emitting layer, redirecting scattered light away from the viewer's direct line of sight by configuring the overlapping portions in linear, polyline, or curved shapes, ensuring the angles between these portions and the pixel directions are between 0° and 90°, thereby dispersing light in multiple directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If signal lines are placed directly below the organic light-emitting diode, then the device structure is simplified and manufacturing is easier, but the signal line thickness creates an uneven surface that causes light scattering and reduces display quality
Solution Approach 1:
The patent introduces a new spatial dimension by tilting the overlapping portion of the signal line at a specific angle (0° < θ ≤ 90°) relative to the light-emitting element. This angular orientation in the planar dimension redirects scattered light away from the viewer's line of sight, effectively solving the light scattering problem caused by signal line thickness while maintaining the simplified direct-below placement structure.
Solution Approach 2:
The patent converts the harmful effect of signal line thickness (which causes light scattering) into a beneficial effect by strategically positioning the overlapping portion at a specific angle. The same thickness that causes scattering is now used to redirect light away from the viewer, transforming the harmful scattering into a controlled light redirection mechanism that improves display quality.
2Reliability
If the signal line is made thicker to ensure adequate signal transmission, then electrical performance is improved, but the uneven surface effect increases causing more light scattering
Solution Approach 1:
The patent resolves this contradiction by introducing angular orientation as a new control dimension. The overlapping portion is positioned at a specific angle (0° < θ ≤ 90°) relative to the light-emitting element, which redirects scattered light away from the viewer. This allows the signal line to maintain adequate thickness for electrical performance while the angular positioning controls the optical effect.
Solution Approach 2:
The patent applies local quality by differentiating the positioning of the signal line in different regions. The overlapping portion where the signal line crosses the light-emitting element is positioned at a specific angle to control scattering, while other portions of the signal line can maintain their standard configuration for optimal electrical performance.
3Object-affected harmful factors
If the signal line is positioned to minimize light scattering, then display quality is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent achieves light scattering control by utilizing angular orientation (0° < θ ≤ 90°) of the overlapping portion, which is a straightforward geometric parameter to specify in the manufacturing process. This angular dimension provides an effective means to control light scattering without requiring complex multi-layer structures or additional manufacturing steps.
Solution Approach 2:
The patent controls light scattering by adjusting a single key parameter - the angle θ of the overlapping portion (where 0° < θ ≤ 90°). This parameter change approach simplifies the manufacturing process compared to more complex structural modifications, as it only requires specifying the angular orientation during the signal line formation process.
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 impact of scattered light on the display effect, improving the overall display quality by minimizing the likelihood of scattered light being caught by the viewer and enhancing the uniformity of light emission.
Implementation Method 1
the light generated in the organic light-emitting layer to be unevenly dispersed, thereby causing dispersion of the display panel
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a substrate, signal lines located on the substrate, and a plurality of light-emitting elements each located on a side of one of the signal lines facing away from the substrate. Each light-emitting element includes a first electrode, a light-emitting layer, and a second electrode that are stacked sequentially. Each signal line includes at least one overlapping portion overlapping the light-emitting layer of one of the light-emitting elements in a direction perpendicular to the display panel. An angle θ between an extending direction of a part of the at least one overlapping portion and a pixel column direction in a display region that satisfies: 0°<θ<90°, or an angle θ between an extending direction of a tangent of a part of the at least one overlapping portion and a pixel column direction in a display area that satisfies: 0°<θ<90°.