Electrically Controlled Viewing Angle Switching Device for Displays
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Solution Overview
Problem
Conventional display devices require manual installation and removal of light control films for anti-peeping and sharing modes, which is inconvenient and costly, and can cause a decrease in brightness and Moiré pattern issues due to their periodic structure.
Innovation Solution
An electrically controlled viewing angle switching device with a liquid crystal cell, phase compensation films, and polarizers is integrated between the display panel and backlight module, allowing for switching between anti-peeping and sharing modes by applying voltage, eliminating the need for manual film changes and reducing brightness loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light control film is manually placed on the display panel to achieve anti-peeping mode, then the anti-peeping effect is improved, but the operation convenience deteriorates and product cost increases
Solution Approach 1:
The patent replaces the mechanical manual placement and removal of light control films with an electrically controlled liquid crystal viewing angle switching device. The liquid crystal cell, controlled by voltage signals, dynamically adjusts the viewing angle to achieve anti-peeping effect without requiring manual intervention. This substitution of mechanical operation with electrical control resolves the contradiction between anti-peeping effect and operation convenience.
Solution Approach 2:
The patent implements a dynamic viewing angle control system using liquid crystal technology. The viewing angle switching device can dynamically adjust its optical properties in response to electrical signals, transitioning between different viewing angle states (e.g., 80 degrees, 45 degrees, 0 degrees) to provide anti-peeping effect when needed and normal viewing mode when not needed, thereby resolving the contradiction between maintaining anti-peeping capability and operational convenience.
2Object-affected harmful factors
If a light control film is manually placed on the display panel to achieve anti-peeping mode, then the anti-peeping effect is improved, but the product cost increases
Solution Approach 1:
The patent integrates the viewing angle switching device as a standard component within the display panel structure, making it a universal feature applicable to various display devices. This multi-functional integration allows the same liquid crystal cell to serve both as a viewing angle controller and as part of the overall display architecture, eliminating the need for separate, expensive anti-peeping film attachments and reducing overall product cost.
Solution Approach 2:
The patent merges the anti-peeping function with the display panel structure by integrating the liquid crystal viewing angle switching device directly into the panel assembly. This combination consolidates multiple functions (display and anti-peeping control) into a single integrated system, reducing the need for separate components and manual attachments, thereby lowering manufacturing costs while maintaining anti-peeping effectiveness.
3Object-affected harmful factors
If a light control film with periodic structure is used, then the anti-peeping effect is improved, but Moiré pattern is generated
Solution Approach 1:
The patent changes the fundamental parameter of the anti-peeping mechanism from a fixed periodic structure (light control film) to a dynamically controllable liquid crystal structure. By altering the viewing angle parameter through electrical control of the liquid crystal cell, the system achieves anti-peeping effect without the periodic structure that causes Moiré patterns, thereby resolving the contradiction between anti-peeping effect and Moiré pattern generation.
4Object-affected harmful factors
If a light control film is placed on the display panel, then the anti-peeping effect is improved, but the display brightness decreases
Solution Approach 1:
The patent replaces the light-absorbing light control film with an electrically controlled liquid crystal viewing angle switching device. The liquid crystal cell, when not activated, allows light to pass through with minimal absorption, maintaining display brightness. When voltage is applied, it selectively blocks light at specific viewing angles to achieve anti-peeping effect, thereby resolving the contradiction between anti-peeping effect and display brightness.
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
Enables convenient switching between modes without manual intervention, enhances anti-peeping effect, and maintains display brightness, while preventing the formation of Moiré patterns.
Implementation Method 1
The electrically controlled viewing angle switching device comprises a liquid crystal cell, at least one phase compensation film and two second polarizers. The liquid crystal cell is disposed between the two second polarizers.
Implementation Method 2
The at least one phase compensation film is disposed at least between one of the second polarizers and the liquid crystal cell.
Implementation Method 3
The electrically controlled viewing angle switching device comprises a liquid crystal cell, at least one phase compensation film and two second polarizers.
Data Source
AI summary
A display device includes an electrically controlled viewing angle switching device including two polarizers and a liquid crystal cell disposed between the two polarizers. The liquid crystal cell includes two alignment layers and a liquid crystal material layer disposed between the two alignment layers and including a plurality of liquid crystal molecules. A direction of an optical axis of the liquid crystal molecules and a viewing angle control direction of the display device have an included angle θ1 of 70-110 degrees. Two alignment directions of the two alignment layers and the viewing angle control direction have an included angle of 90±20 degrees and an included angle of 270±20 degrees, respectively. Included angles between directions of transmission axis of the two polarizers and alignment directions of the two alignment layers are selected from one of 0±5 degrees and 90±5 degrees.