Display Optical Layer Structure for Light Refraction Control
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Solution Overview
Problem
The refractive index differences between various layers in a display device lead to light refraction and extinction, reducing light output efficiency and complicating the manufacturing process.
Innovation Solution
A display device design incorporating a substrate with a light emission area, a light emitting element layer, and a sensing layer featuring refractive layers with controlled optical indices and inclined side surfaces to manage light refraction, along with an anti-reflection layer for improved light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple layers with different refractive indices are used in the functional panel and window, then the device can achieve better functional performance (touch sensing and reflection prevention), but light refraction occurs causing light extinction and reduced light output efficiency
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the refractive indices of the refraction layers. Specifically, the first refraction layer has a refractive index of 1.3 to 1.6 and the second refraction layer has a refractive index of 1.4 to 1.7, creating a gradient that manages light refraction while maintaining functional performance. This parameter optimization resolves the contradiction by balancing functional requirements with light transmission efficiency.
Solution Approach 2:
The patent uses composite material structures by combining multiple refraction layers with different refractive indices in a stacked configuration. The first refraction layer (with lower refractive index) and second refraction layer (with higher refractive index) work together as a composite system to control light paths, preventing light extinction while maintaining the functional benefits of multiple layers.
2Illumination intensity
If multiple refraction layers with different refractive indices are added to manage light refraction, then light output efficiency is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the refraction functionality into existing layer structures rather than adding completely separate components. The first and second refraction layers are integrated with the functional panel and window assembly, combining multiple functions (touch sensing, reflection prevention, and light refraction management) into a unified structure that reduces manufacturing complexity despite improving light output efficiency.
Solution Approach 2:
By optimizing the refractive index parameters within specific ranges (first layer: 1.3-1.6, second layer: 1.4-1.7), the patent achieves effective light refraction management without requiring excessive layer complexity. This parameter optimization allows for a manageable manufacturing process while maintaining high light output efficiency.
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
Enhances light output efficiency and simplifies the manufacturing process by optimizing refractive index differences and layer structures.
Implementation Method 1
some of the light emitted from the light emitting element may be refracted while passing through the layers, and may be extinguished without being emitted to the front surface of the display device
Data Source
AI summary
A display device includes a substrate having a light emission area, a light emitting element layer including a light emitting element on the light emission area, and an sensing layer on the light emitting element layer and including a sensing electrode having a first opening overlapping the light emission area, a first refraction layer directly on the sensing electrode and having a second opening overlapping the light emission area, and a second refraction layer on the light emitting element layer and the first refraction layer, a first optical refractive index of the first refraction layer being less than a second optical refraction index of the second refraction layer.