Inclined Reflective Layer and Light Blocking for Display Devices
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Solution Overview
Problem
Existing display devices face challenges in reducing external light reflectance, which affects display quality and visibility, especially in bright environments.
Innovation Solution
The display device incorporates a substrate with a first electrode, a pixel defining layer, a light emitting layer, and a second electrode, along with an encapsulation layer, sensing electrodes, and light blocking layers. The light blocking layers, including second-1, second-2, and second-3 sub-light blocking layers, are elliptically shaped and oriented at various angles to effectively reduce external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional flat reflective layer is used, then the device structure is simple, but external light reflection is high affecting display quality
Solution Approach 1:
The reflective layer is designed with an inclined lower surface instead of a flat surface. This curvature modification causes external light to reflect at angles that do not return to the user's eyes, thereby reducing the harmful reflection effect while maintaining the basic reflective function.
Solution Approach 2:
The reflective layer is divided into multiple sub-layers (first reflective sub-layer, second reflective sub-layer, etc.) with different orientations. Each sub-layer has a specific inclination angle to reflect light from different directions, collectively reducing external light reflection from all angles while maintaining device functionality.
2Object-affected harmful factors
If multiple light blocking layers with different orientations are added, then external light reflection is reduced, but the device structure becomes more complex
Solution Approach 1:
The light blocking function is segmented into multiple layers (first light blocking layer, second light blocking layer, third light blocking layer) with different orientations. Each layer blocks light from specific directions, and the combination of all layers provides comprehensive protection against external light reflection from all angles.
Solution Approach 2:
Each light blocking layer is positioned and oriented to address specific reflection problems from particular directions. The first light blocking layer targets one set of angles, the second layer targets another set, and so on, providing localized solutions that collectively solve the overall external light reflection issue.
3Object-affected harmful factors
If the reflective layer is inclined to reduce reflection, then display quality improves, but manufacturing precision requirements increase
Solution Approach 1:
Instead of requiring one highly precise inclined surface, the reflective layer is segmented into multiple sub-layers with different inclination angles. This segmentation distributes the precision requirement across multiple simpler components, making manufacturing more feasible while achieving the same overall reflection reduction effect.
Solution Approach 2:
The patent uses multiple reflective sub-layers with different orientations to provide redundant reflection control. Even if individual layers are not perfectly oriented, the collective action of multiple layers ensures adequate reflection reduction, tolerating manufacturing variations better than a single precise layer would.
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
This configuration significantly improves display quality by minimizing external light reflection, enhancing visibility, and reducing power consumption, thereby providing better performance in various lighting conditions.
Implementation Method 1
a reflective layer on the first sensing insulating layer
Implementation Method 2
a first light blocking layer and a second light blocking layer on the first sensing insulating layer
Data Source
AI summary
A display device including: a substrate; a first electrode on the substrate; a pixel defining layer having a pixel opening, wherein the first electrode is in the pixel opening; a light emitting layer in the pixel opening; a second electrode on the light emitting layer and the pixel defining layer; an encapsulation layer on the second electrode; a first sensing electrode part on the encapsulation layer; a first sensing insulating layer on the first sensing electrode part; a second sensing electrode part and a reflective layer positioned on the first sensing insulating layer; and a first light blocking layer and a second light blocking layer on the first sensing insulating layer; wherein at least a portion of a lower surface of the reflective layer is inclined.