Display Panel Light Blocking Layout for Low-Reflection Transmission Areas
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Solution Overview
Problem
Existing display panels exhibit varying transmittance levels, leading to issues such as noise images and ghost phenomena in areas with electronic modules, affecting the quality of signals acquired by these modules.
Innovation Solution
The display panel incorporates a light blocking layer with at least one lower insulating layer beneath it, reducing light reflection and improving transmittance by minimizing the difference in refractive indices between layers, thereby enhancing signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light blocking layer is added to block light, then signal quality is improved, but light transmittance is reduced
Solution Approach 1:
The patent applies local quality by making the light blocking layer selectively transparent. The layer blocks light in certain areas (where electronic modules are located) while allowing light transmission in other areas. This is achieved through a patterned structure where the light blocking layer has different optical properties in different regions, thus improving signal quality for modules while maintaining display visibility in non-module areas.
Solution Approach 2:
The light blocking layer acts as an intermediary between the display panel and electronic modules. It mediates the light interaction by selectively blocking and transmitting light based on the underlying components. The layer includes insulating materials with specific refractive indices that intermediate the optical path, reducing reflection and improving both signal quality and overall light transmission through proper material selection and layer design.
2Illumination intensity
If the refractive index difference between layers is reduced, then light reflection is minimized and transmittance is improved, but material selection becomes more constrained
Solution Approach 1:
The patent applies parameter changes by carefully selecting and adjusting the refractive index parameters of the light blocking layer materials. The insulating layer is designed with a refractive index between 1.3 and 1.7, which is specifically chosen to match well with adjacent layers (substrate, light blocking layer, encapsulation layer). This parameter optimization reduces reflection at interfaces and improves light transmittance while still allowing practical material selection.
3Object-affected harmful factors
If a light blocking layer with insulating material is used, then light reflection is reduced, but the device structure becomes more complex
Solution Approach 1:
The light blocking layer is designed with multi-functionality, serving as both a light blocking element and an insulating layer simultaneously. The insulating material provides electrical isolation for the electronic modules while its refractive index properties reduce light reflection. This universal design eliminates the need for separate insulating and optical matching layers, thus reducing overall device complexity while achieving multiple objectives.
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 occurrence of noise images and improves the transmittance of light, enhancing the quality of signals received by electronic modules.
Implementation Method 1
improving transmittance by minimizing the difference in refractive indices between layers
Implementation Method 2
reducing light reflection
Data Source
Figure 1A
Figure 1B
Figure 2A
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 (BML) including a first opening (BM-OP) that defines a transmission area (TP), at least one lower insulating layer (BMB) disposed between the light blocking layer and the substrate, the at least one lower insulating layer including a second opening (ML_OP) that overlaps the first opening, pixel circuits disposed on the light blocking layer, light emitting elements (LD) electrically connected to the pixel circuits, and an encapsulation layer (140) overlapping the light emitting elements.