Encapsulation Layer Thickness Ratio for Display Uniformity
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Solution Overview
Problem
Conventional display devices experience luminance and color differences across the display area due to uneven thickness of encapsulation layers, leading to image quality degradation.
Innovation Solution
A display device with a multi-layer encapsulation structure, where the first and third encapsulation layers are inorganic, and the second layer is organic, are sequentially stacked, with specific thickness ratios and configurations to minimize luminance and color differences between regions, ensuring uniform image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the encapsulation layer thickness is increased to prevent impurities, then protection reliability is improved, but luminance uniformity deteriorates due to thickness variations across regions
Solution Approach 1:
The encapsulation layer is divided into a first region (central area) and a second region (edge area) with different thickness specifications. The first region has a greater thickness to provide enhanced protection against impurities, while the second region has a reduced thickness to minimize luminance differences and maintain image quality at the edges of the display area.
Solution Approach 2:
Different regions of the encapsulation layer are assigned different thickness qualities based on their functional requirements. The central region requires thicker protection for reliability, while the edge region requires thinner structure for optical uniformity. This local differentiation resolves the contradiction between protection and luminance uniformity.
2Illumination intensity
If the encapsulation layer thickness is reduced to improve luminance uniformity, then image quality is improved, but protection against impurities deteriorates
Solution Approach 1:
The encapsulation layer is segmented into regions with different thicknesses. The second region at the edges has reduced thickness to improve luminance uniformity and image quality, while the first region in the center maintains greater thickness to ensure adequate protection against impurities.
Solution Approach 2:
The encapsulation layer implements local quality differentiation where edge regions have thinner structure for optical performance and central regions have thicker structure for protection. This resolves the contradiction by optimizing each region's thickness according to its specific functional requirements.
3Ease of manufacture
If a single-layer encapsulation structure is used to simplify manufacturing, then ease of manufacture is improved, but image quality deteriorates due to thickness variations
Solution Approach 1:
The encapsulation layer is segmented into a first region and a second region with different thickness characteristics. This segmentation is achieved through controlled manufacturing processes that form different thickness zones in a single encapsulation layer structure, maintaining ease of manufacture while improving image quality through reduced luminance differences.
Solution Approach 2:
The encapsulation layer implements local quality variation with different thicknesses in different regions. The central region has greater thickness while edge regions have reduced thickness, optimizing both manufacturing feasibility and image quality by minimizing luminance uniformity issues.
Data Source
AI summary
A display device includes: a substrate on which a display area and a non-display area are defined; a plurality of pixels disposed on the substrate in the display area; and an encapsulation layer disposed on the pixels to cover the pixels, where the encapsulation layer including a first region and a second region different from the first region. The encapsulation layers has a thickness in a range of 1.75 μm to 4.0 μm, and the ratio of a thickness of the second region of the encapsulation layer to a thickness of the first region of the encapsulation layer is in a range of 0.95 to 1.0.