Display Light-Blocking Layers for Narrow Viewing-Angle Privacy
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Solution Overview
Problem
Existing display devices lack the ability to control viewing angles, particularly in public settings where personal information needs protection from unauthorized viewing.
Innovation Solution
A display device design incorporating a light blocking layer with island-shaped second light blocking layers and reflective layers to control the viewing angle, ensuring light is emitted with a narrow viewing angle by blocking and reflecting light at specific angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display device structure is used, then light is emitted with a wide viewing angle, but personal information can be viewed from unauthorized positions
Solution Approach 1:
The light blocking layer is divided into multiple segments: a first light blocking layer with a first opening and a second light blocking layer with a second opening. These segmented structures work together to control light emission angles, blocking light at certain angles while allowing it to pass through at others, thereby achieving narrow viewing angle and privacy protection without completely blocking visibility from authorized positions.
Solution Approach 2:
Different regions of the display device have different light transmission properties. The first and second light blocking layers are positioned at specific locations with specific opening sizes and positions, creating localized light blocking and transmission zones. This local quality control allows the display to emit light with a narrow viewing angle while maintaining visibility from authorized viewing positions.
2Reliability
If a light blocking layer is added to narrow the viewing angle, then privacy protection is improved, but the device structure becomes more complex
Solution Approach 1:
The light blocking function is segmented into two distinct layers: a first light blocking layer and a second light blocking layer, each with its own opening. This segmentation allows for independent optimization of each layer's parameters and simplifies the manufacturing process by enabling separate formation of each layer, thereby managing device complexity while achieving the desired privacy protection.
Solution Approach 2:
The light blocking layer serves multiple functions: it blocks light at unauthorized viewing angles, allows light transmission at authorized angles, and defines the viewing angle characteristics of the display. By integrating these multiple functions into a single structural component, the invention reduces overall device complexity compared to using separate components for each function.
3Manufacturing precision
If the second light blocking layer is positioned to overlap the central non-emitting area, then viewing angle control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The second light blocking layer is designed to overlap the central non-emitting area, creating a region where light blocking and non-emitting areas coincide. This positioning creates a robust structure where minor alignment variations do not significantly affect performance, as the overlapping region provides a buffer zone that maintains viewing angle control even with slight manufacturing tolerances.
Solution Approach 2:
The second light blocking layer has an asymmetric positioning relative to the emitting area, specifically overlapping the central non-emitting area rather than being centered on the emitting area. This asymmetric design allows for relaxed alignment requirements compared to a symmetric configuration, as it provides a larger tolerance margin for manufacturing variations while maintaining effective viewing angle control.
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 solution effectively narrows the viewing angle of emitted light, enhancing privacy by limiting unauthorized viewing while maintaining equivalent light emission levels.
Implementation Method 1
a light blocking layer on the encapsulation layer. The light blocking layer includes a first light blocking layer defining a first opening overlapping the emitting area, and a second light blocking layer which is in the first opening to have an island shape and spaced apart from the first light blocking layer
Implementation Method 2
The reflective layer may include a first reflective layer defining a second opening, and a second reflective layer in the second opening to have an island shape. The second opening may overlap the central non-emitting area and the emitting area
Data Source
AI summary
A display device includes a base substrate, a light emitting element layer including a central non-emitting area, an emitting area surrounding the central non-emitting area, and a peripheral non-emitting area surrounding the emitting area, an encapsulation layer covering the light emitting element layer, and a light blocking layer on the encapsulation layer. The light blocking layer includes a first light blocking layer defining a first opening overlapping the emitting area, and a second light blocking layer in the first opening and spaced apart from the first light blocking layer.