Under-Display Component Area Layer Stack for Brightness Uniformity
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Solution Overview
Problem
Display apparatuses face challenges in providing an extended display area that can accommodate electronic components while maintaining image quality and reliability, especially in thinner and lighter designs.
Innovation Solution
A display apparatus with a main display area and a component area, featuring a substrate with specific layers such as a compensation layer, barrier layers, and buffer layers, along with a thin-film encapsulation layer, and a method of manufacturing that includes forming these layers to optimize light transmittance and image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a component area with electronic components is added to extend display functionality, then display versatility is improved, but image quality and brightness uniformity deteriorate due to interference from electronic elements
Solution Approach 1:
The patent applies different layer configurations and material compositions to different regions of the display. The component area has specialized buffer layers, barrier layers, and encapsulation structures tailored to its specific requirements, while the main display area uses optimized configurations for image quality. This localized optimization allows electronic components to be integrated without compromising overall display performance.
Solution Approach 2:
The patent employs composite layer structures combining multiple materials with different properties. The buffer layers use combinations of silicon nitride, silicon oxide, and organic materials. The encapsulation layers combine inorganic barrier layers with organic protective layers. These composite structures provide both mechanical support and functional performance in different display regions.
2Ease of operation
If the display apparatus is made thinner and lighter to increase portability, then ease of operation is improved, but manufacturing precision and reliability worsen due to reduced margin for error
Solution Approach 1:
The patent utilizes thin-film encapsulation structures with multiple nanometer-scale layers. The buffer layers, barrier layers, and encapsulation layers are all designed as thin films with precise thickness control (e.g., 50-200 nm ranges). This thin-film approach enables the display to be made thinner while maintaining structural integrity through the multi-layer composite design.
Solution Approach 2:
The patent optimizes various physical parameters of the layers including thickness, refractive index, and material composition. The buffer layer thickness is controlled within specific ranges (50-200 nm), and the organic buffer layer has a refractive index of 1.3-1.6. These parameter optimizations enable thinner designs while maintaining manufacturing feasibility and device reliability.
3Reliability
If buffer layer thickness is increased to improve image quality and reduce interference, then image quality is improved, but light transmittance deteriorates
Solution Approach 1:
The patent uses composite buffer layer structures combining inorganic materials (silicon nitride, silicon oxide) with organic materials. The organic buffer layer with refractive index 1.3-1.6 provides optical matching that reduces interference while maintaining protective functions. This composite approach allows sufficient thickness for image quality without excessive light absorption.
Solution Approach 2:
The patent optimizes the thickness and refractive index parameters of the buffer layers. The organic buffer layer is designed with specific thickness (50-200 nm) and refractive index (1.3-1.6) to balance optical performance. These parameter optimizations ensure adequate image quality while maintaining high light transmittance for the display.
Data Source
AI summary
A display apparatus includes a main display area, and a component area including pixel groups spaced apart from each other and a transmission area between the pixel groups. The display apparatus further includes a substrate including a first base layer, a compensation layer, a first barrier layer, and a second barrier layer sequentially stacked on one another, a bottom metal layer between the first barrier layer and the second barrier layer, a buffer layer on the second barrier layer, main display elements on the substrate of the main display area, and auxiliary display elements on the substrate of the component area.