Light-Emitting Display Overlapping Pattern Layers for Sensor Transmittance
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Solution Overview
Problem
The low transmittance of sensors in light emitting display devices leads to deteriorated perceived image quality.
Innovation Solution
A light emitting display device with a first pattern defining layer adjacent to a second electrode and a second pattern defining layer adjacent to a second capping layer, both configured to improve transmittance in transmission areas, utilizing polycyclic aromatic compounds with low affinity for conductive materials to enhance sensor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a sensor is located on the display device panel to enable bezel-less or seamless structure, then the display device achieves a bezel-less or seamless structure, but the light transmittance of the sensor decreases leading to deteriorated perceived image quality
Solution Approach 1:
The patent applies local quality by introducing pattern defining layers specifically in the transmission area of the sensor where light needs to pass through. The first pattern defining layer is formed in the transmission area with lower refractive index than the second electrode, and the second pattern defining layer is formed with lower refractive index than the second capping layer. This localized modification optimizes light transmittance specifically where needed without affecting other areas of the display device.
Solution Approach 2:
The patent utilizes parameter changes by carefully selecting and adjusting the refractive index parameters of the pattern defining layers. The first pattern defining layer has a refractive index lower than the second electrode, and the second pattern defining layer has a refractive index lower than the second capping layer. This parameter optimization reduces light reflection and enhances light transmittance through the sensor area.
2Illumination intensity
If pattern defining layers are added to improve sensor transmittance, then the light transmittance of the sensor improves, but the device structure becomes more complex
Solution Approach 1:
The patent applies universality by designing the pattern defining layers to serve multiple functions: they act as both optical elements to improve light transmittance and as structural elements to define the transmission area boundaries. The first pattern defining layer is adjacent to the second electrode and the second pattern defining layer is adjacent to the second capping layer, with both layers configured to overlap, creating a unified structure that performs both optical and structural roles.
3Manufacturing precision
If multiple pattern defining layers are introduced to enhance transmittance, then the perceived image quality improves, but the manufacturing process requires additional masks
Solution Approach 1:
The patent applies preliminary action by forming the first pattern defining layer before forming the second pattern defining layer. The first pattern defining layer is formed with a first pattern, and then the second pattern defining layer is formed with a second pattern that overlaps with the first pattern. This sequential formation allows each layer to be optimized independently while ensuring proper alignment and overlap to maximize light transmittance.
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
Improves overall transmittance of the sensor, thereby enhancing perceived image quality and reducing the need for additional masks in the manufacturing process.
Implementation Method 1
a first pattern defining layer adjacent to a side surface of the second electrode and provided in each of a plurality of transmission areas on the substrate, and a second pattern defining layer adjacent to a side surface of the second capping layer and configured to overlap the first pattern defining layer
Data Source
AI summary
Disclosed is a light emitting display device and manufacturing method thereof. The light emitting display device includes a light emitting device including a first electrode, an intermediate layer, and a second electrode at each of a plurality of emission areas on a substrate, a first capping layer and a second capping layer sequentially provided on the light emitting device and configured to have different refractive indexes, a first pattern defining layer adjacent to a side surface of the second electrode and provided at each of a plurality of transmission areas on the substrate, and a second pattern defining layer adjacent to a side surface of the second capping layer and configured to overlap the first pattern defining layer.