Display Pixel Opening Structure for Higher Front Light Output
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Solution Overview
Problem
Some light generated by a light-emitting element in display devices is lost without being emitted to the outside, leading to reduced front light output efficiency and display quality.
Innovation Solution
A display device design featuring a substrate with a pixel electrode, a bank layer, an encapsulation layer, a first insulating layer with defined openings, and a second insulating layer of higher refractive index, including extension parts and pixel openings with specific dimensions and shapes to enhance light output efficiency and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light-emitting elements are stacked with multiple layers (substrate, pixel electrode, bank layer, encapsulation layer), then display functionality is achieved, but light is reflected at inter-interfaces reducing light output efficiency
Solution Approach 1:
The patent converts the harmful light reflection at inter-interfaces into a beneficial effect by introducing a specific insulating layer configuration. The first insulating layer with refractive index 1.3-1.6 and the second insulating layer with refractive index 1.7-1.9 create controlled reflection that redirects light toward the front emission direction, transforming energy loss into useful light output.
Solution Approach 2:
The patent applies parameter changes by carefully selecting and controlling the refractive indices of insulating layers. The first insulating layer has refractive index 1.3-1.6 and the second has 1.7-1.9, creating an optimal gradient that minimizes reflection loss while maintaining display functionality. The thickness parameters (first insulating layer: 2-5 μm, second insulating layer: 9-11 μm) are also optimized to achieve the desired light transmission characteristics.
2Loss of energy
If insulating layers with different refractive indices are introduced to improve light transmission, then light output efficiency increases, but device structure becomes more complex
Solution Approach 1:
The insulating layers serve multiple functions simultaneously: they provide electrical insulation between the sensing electrode and underlying structures, maintain mechanical structural integrity, and optimize optical performance by controlling light reflection and transmission. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent optimizes the balance between performance and complexity by carefully selecting refractive index parameters (1.3-1.6 for first layer, 1.7-1.9 for second layer) and thickness parameters (2-5 μm and 9-11 μm respectively). These parameter optimizations achieve high light output efficiency while maintaining a manageable layer structure that can be integrated into existing display manufacturing processes.
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 design improves light output efficiency and display quality by minimizing light loss through strategic layering and refractive index manipulation, enhancing the overall performance of the display device.
Implementation Method 1
a second insulating layer disposed on the first insulating layer and having a higher refractive index than a refractive index of the first insulating layer
Data Source
AI summary
A display device includes a substrate, a pixel electrode disposed on the substrate, a bank layer which is disposed on the pixel electrode and in which a pixel opening overlapping the pixel electrode is defined, an encapsulation layer disposed on the pixel electrode and the bank layer, a sensing electrode disposed on the encapsulation layer, a first insulating layer which is disposed on the sensing electrode and in which an opening overlapping the pixel opening is defined, and a second insulating layer disposed on the first insulating layer and having a higher refractive index than a refractive index of the first insulating layer. The opening of the first insulating layer includes a first edge and a second edge separated from an edge of the pixel opening and extending in different directions from each other and a first extension part disposed at a portion where the first edge and the second edge meet.