Display Device Insulating Layer Inclination Angle Optimization
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Solution Overview
Problem
Existing display devices suffer from reduced light emission efficiency and display quality due to light being reflected at interlayer interfaces rather than being emitted to the outside.
Innovation Solution
A display device structure is introduced, featuring a substrate with a pixel electrode, a bank layer, an encapsulation layer, a sensing electrode, and insulating layers with varying side inclination angles to optimize light emission and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light emitting element generates light, then light emission occurs, but light is reflected at interlayer interface causing reduced front light emission efficiency
Solution Approach 1:
The patent converts the harmful light reflection at the interlayer interface into a beneficial effect by designing the side inclination angle of the first insulating layer to be between 45-60 degrees. This specific angle range causes the reflected light to be redirected toward the front emission direction, transforming the energy loss into useful front light output and improving overall light emission efficiency.
Solution Approach 2:
The patent changes the geometric parameter of the first insulating layer by setting its side inclination angle to a specific range (45-60 degrees). This parameter modification optimizes the light reflection path at the interlayer interface, ensuring that reflected light contributes to front emission rather than being lost, thereby resolving the contradiction between light generation and reflection loss.
2Stability of the object's composition
If pattern thickness is reduced to improve foldable product stability, then device stability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different side inclination angles to different regions of the first insulating layer. Specifically, the side inclination angle is controlled to be between 45-60 degrees in the region corresponding to the pixel opening, while other regions may have different angles. This local differentiation allows the pattern to maintain uniform thickness for stability while accommodating manufacturing variations through optimized light emission geometry.
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 proposed structure enhances light emission efficiency and display quality by minimizing light reflection and ensuring uniform light distribution, while also allowing for a thinner, more stable display device suitable for foldable products.
Implementation Method 1
a second insulating layer which is disposed on the first insulating layer and has a higher refractive index than a refractive index of the first insulating layer
Implementation Method 2
Some of light generated by a light emitting element may disappear without being emitted to the outside, such as being reflected at an interlayer interface
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 which is disposed on the first insulating layer and has a higher refractive index than a refractive index of the first insulating layer, where a side inclination angle of the first insulating layer in the opening of the first insulating layer is different depending on a position of the opening of the first insulating layer.