Display Polarizer Structure for Directional Privacy Control
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Solution Overview
Problem
Electronic devices, particularly display devices, face challenges in controlling the path of emitted light to enhance privacy and safety, such as preventing light from being projected onto windshields or visible to unintended viewers.
Innovation Solution
A display device incorporating a light controlling structure with a first polarizer, a second polarizer, and a first light controlling layer between them, which adjusts light luminance in different directions to control the path of emitted light, ensuring angles of emission differ significantly in horizontal and vertical directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light controlling structure with multiple polarizers and light controlling layers is added, then light route control capability is improved, but device complexity increases
Solution Approach 1:
The patent implements a nested structure where the first light controlling layer is positioned between the first and second polarizers, and the second light controlling layer is positioned between the second polarizer and the light emitting unit. This nested arrangement allows multiple light control functions to be integrated within a compact structure, achieving different light route control capabilities at different depth levels without proportionally increasing overall device complexity.
2Object-affected harmful factors
If light emission angles are controlled to differ significantly in horizontal and vertical directions, then privacy and safety are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different light controlling layers with distinct optical properties at different locations within the display structure. The first light controlling layer and second light controlling layer are positioned at different depths and orientations, creating localized optical effects that collectively achieve asymmetric light emission angles. This local quality differentiation allows precise angle control without requiring extreme manufacturing precision across the entire device.
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 prevents light from being projected onto windshields and reduces visibility to unintended viewers, enhancing safety and privacy by controlling light emission angles.
Implementation Method 1
The light controlling structure is disposed on the light emitting unit and includes a first polarizer, a second polarizer and a first light controlling layer, wherein the first light controlling layer is disposed between the first polarizer and the second polarizer
Data Source
AI summary
An electronic device includes a substrate, a light emitting unit disposed on the substrate and a light controlling structure disposed on the light emitting unit. The light controlling structure includes a first polarizer, a second polarizer and a first light controlling layer disposed between the first polarizer and the second polarizer. The adjusted light has a first luminance measuring result in a first direction and a second luminance measuring result in a second direction perpendicular to the first direction, a first angle is referred to a range in which a luminance of the first luminance measuring result is greater than or equal to 50% of a normal emitting luminance, a second angle is referred to a range in which a luminance of the second luminance measuring result is greater than or equal to 50% of the normal emitting luminance, and the first angle is different from the second angle.