Under-Display Panel Opening Structure for Low-Reflection Transmittance
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Solution Overview
Problem
Existing display panels exhibit varying transmittance across different areas, leading to issues with signal quality and noise interference, particularly when electronic modules like cameras are integrated under or below the display panel.
Innovation Solution
The display panel design includes a light blocking layer with aligned openings, multiple insulating layers with varying refractive indices, and a buffer layer configuration to optimize transmittance and reduce reflection, thereby enhancing signal quality and minimizing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light blocking layer with openings is disposed on the substrate to define transmission areas, then transmittance in specific areas is improved for electronic module integration, but reflection and noise interference increase
Solution Approach 1:
An intermediate refractive index layer is introduced between the light blocking layer and the substrate. This intermediary layer has a refractive index that is higher than the substrate but lower than the light blocking layer, serving as a transition medium to reduce reflection and improve light transmission through the opening.
Solution Approach 2:
The refractive index of the intermediate layer is specifically controlled to be within a certain range (higher than substrate, lower than light blocking layer) to optimize the balance between transmission and reflection reduction. This parameter optimization allows the layer to function as an effective refractive index transition medium.
2Illumination intensity
If multiple insulating layers with different refractive indices are introduced to reduce reflection, then transmittance is improved, but device complexity increases
Solution Approach 1:
The refractive index transition is applied locally only in the region beneath the opening where light transmission is needed, rather than throughout the entire display panel. This localized approach reduces the overall complexity while maintaining the optical optimization where it is most beneficial.
Solution Approach 2:
Instead of using multiple thick layers, a single intermediate layer with a specifically optimized refractive index range is employed. This parameter-based optimization achieves the desired optical effect with minimal additional structural complexity.
3Manufacturing precision
If the sidewall of the light blocking layer is aligned with the sidewall of the lower insulating layer, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The sidewalls of the light blocking layer and the lower insulating layer are aligned and merged into a common vertical boundary. This merging of boundaries simplifies the manufacturing process by reducing the number of independent alignment operations required, while still achieving high precision through the unified structure.
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
The optimized transmittance and reduced reflection improve signal acquisition and reception by electronic modules, reducing noise phenomena such as ghost images, while maintaining structural integrity and functionality.
Implementation Method 1
the at least one lower insulating layer including a second opening that overlaps the first opening... the first lower insulating layer may have a refractive index different from a refractive index of the second lower insulating layer
Data Source
AI summary
An electronic device includes a display panel. The display panel includes a substrate, a light blocking layer disposed on the substrate, the light blocking layer including a first opening that defines a transmission area, at least one lower insulating layer disposed between the light blocking layer and the substrate, the at least one lower insulating layer including a second opening that overlaps the first opening, pixel circuits disposed on the light blocking layer, light emitting elements electrically connected to the pixel circuits, and an encapsulation layer overlapping the light emitting elements.