Anti-peeping Control Device Asymmetric Polarization
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Solution Overview
Problem
Current display devices with anti-peeping functions either consume excessive power or have poor anti-peeping effects due to the use of anti-peeping films or backlight modules with limited viewing angle control.
Innovation Solution
An anti-peeping control device comprising a first and second polarizer with a liquid crystal box, where the polarizers' transmission axes form an angle between 5 to 15 degrees or are parallel but not aligned with the polarizer edges, and the liquid crystal alignment directions are adjusted to achieve electronic control of the anti-peeping effect, allowing for asymmetric anti-peeping by altering the light emitting angle of the surface light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-peeping film or electronically controlled diffusing film is placed on the display device, then anti-peeping function is achieved, but power consumption increases significantly
Solution Approach 1:
The patent changes the optical parameters of the light source by using a polarizer to control the polarization state of light. By adjusting the polarization direction and combining it with a reflective sheet, the viewing angle and anti-peeping effect are achieved through optical parameter control rather than electronic control, thereby reducing power consumption while maintaining the anti-peeping function.
Solution Approach 2:
The patent introduces a polarizer as an intermediary component between the light source and the display panel. This polarizer mediates the light transmission by controlling polarization states, enabling anti-peeping functionality without requiring additional power-consuming electronic control layers, thus resolving the contradiction between function and energy consumption.
2Adaptability or versatility
If backlight module combines narrow viewing angle and wide viewing angle function with multiple light sources, then anti-peeping or sharing effects are achieved, but anti-peeping effect is poor
Solution Approach 1:
The patent employs asymmetric optical design by positioning the polarizer at a specific angle (5-45 degrees relative to the display panel's long side) and combining it with a reflective sheet. This asymmetric configuration creates directional light control that provides both wide viewing angle and effective anti-peeping performance, resolving the contradiction between adaptability and anti-peeping reliability.
Solution Approach 2:
The patent adds a dimensional control mechanism by introducing polarization angle control in addition to the conventional viewing angle control. By controlling the polarization direction of light and its reflection angle, the system achieves multi-dimensional light path management, enabling simultaneous wide viewing angle and strong anti-peeping effect.
3Ease of operation
If standard polarizer configuration is used in display device, then basic display function is achieved, but asymmetric anti-peeping effect cannot be realized
Solution Approach 1:
The patent introduces dynamic adjustability by allowing the polarizer's transmission axis to be positioned at adjustable angles (5-45 degrees) relative to the display panel's long side. This dynamic configuration enables the display to switch between different viewing modes and achieve asymmetric anti-peeping effects while maintaining basic display functionality, resolving the contradiction between ease of operation and adaptability.
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 enables efficient electronic switching of anti-peeping effects, reduces the number of polarizers required, maintains luminance, and corrects viewing angle shifts, providing an asymmetric anti-peeping effect while minimizing power consumption and enhancing privacy.
Implementation Method 1
The liquid crystal box is disposed between the first polarizer and the second polarizer. The liquid crystal box includes a first alignment layer, a second alignment layer and a liquid crystal material.
Implementation Method 2
The first polarizer includes a first transmission axis having a first axial direction. The second polarizer is disposed opposite to the first polarizer. The second polarizer includes a second transmission axis having a second axial direction.
Data Source
AI summary
An anti-peeping control device includes two polarizers and a liquid crystal box disposed between the two polarizers. An included angle of 5 to 15 degrees is formed between the axial directions of the transmission axes of the two polarizers, or the axial directions of the transmission axes of the two polarizers are parallel to each other but not parallel and not perpendicular to any side edge of the polarizer. The axial directions of the transmission axes of the two polarizers are perpendicular or parallel to the alignment direction of the alignment layer of the liquid crystal box. The anti-peeping control device can use an electronic control method to switch the anti-peeping effect. A backlight module and display using the anti-peeping control device are also proposed.