Backlight Module Dual Light Guide Plates Privacy Mode Switching
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Solution Overview
Problem
Existing display devices lack convenience in switching between normal and privacy display modes, as anti-peeping films require manual fixation or removal, which is inconvenient and not user-friendly.
Innovation Solution
A backlight module with two light guide plates and sources, where the first light source emits light with a small divergence degree for privacy mode and the second light source emits light with a large divergence degree for normal mode, allowing switching between modes by simply turning on or off the respective sources without the need for anti-peeping films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-peeping film is used to achieve privacy display, then privacy protection is improved, but device complexity and ease of operation deteriorate due to manual fixation or removal requirements
Solution Approach 1:
The patent implements dynamic switching between privacy and normal display modes by controlling different light sources (first and second light sources) rather than using a static anti-peeping film. The system can dynamically adjust the viewing angle characteristics by activating appropriate light sources based on user needs, eliminating manual film operations.
Solution Approach 2:
The patent replaces the mechanical system of manually fixing or removing anti-peeping films with an optical control system. By using different light sources with specific emission characteristics, the system achieves privacy protection through optical means rather than mechanical film manipulation, improving ease of operation.
2Object-affected harmful factors
If an anti-peeping film is used to achieve privacy display, then privacy protection is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent integrates privacy display functionality into the existing backlight structure by utilizing multiple light sources that serve dual purposes. The first and second light sources not only provide illumination but also enable privacy protection when activated, eliminating the need for separate anti-peeping film components.
Solution Approach 2:
The patent extracts the privacy protection function from the separate anti-peeping film component and integrates it into the backlight module itself. By controlling the emission characteristics of the light sources, the system achieves privacy protection as an inherent function of the display device rather than requiring additional external components.
3Object-affected harmful factors
If light with small divergence degree is emitted for privacy mode, then privacy protection is improved, but viewing angle range narrows
Solution Approach 1:
The patent implements dynamic control over viewing angle characteristics by selectively activating different light sources. When privacy protection is needed, the first light source with small divergence angle is activated. When broader viewing is needed, the second light source is activated, allowing the system to adapt to different usage scenarios.
Solution Approach 2:
The patent changes the emission parameters (divergence angle) by switching between different light sources. The first light source emits light with a small divergence angle for privacy protection, while the second light source provides broader emission for normal viewing, allowing parameter adjustment based on requirements.
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 privacy and normal display modes by controlling the light sources, improving user experience and eliminating the need for manual film adjustments, while maintaining effective privacy protection and clear visibility.
Implementation Method 1
The first light guide plate includes a light guide element guiding light along a direction perpendicular to the light exit surface of the first light guide plate
Implementation Method 2
The second light guide plate includes a scattering element. With such a configuration, the divergence degree of light emitted from the first light source and exiting from the first light guide plate is smaller than the divergence degree of light emitted from the second light source and exiting from the second light guide plate
Data Source
AI summary
A backlight module, a display device and a driving method are disclosed. The backlight module includes a first light guide plate and a second light guide plate arranged oppositely, a first light source and a second light source. A surface of the first light guide plate facing the second light guide plate is a light exit surface of the first light guide plate. The first light source is arranged at a light entrance surface of the first light guide plate. The second light source is arranged at a light entrance surface of the second light guide plate. The first light guide plate includes a light guide element guiding light along a direction perpendicular to the light exit surface of the first light guide plate. The second light guide plate includes a scattering element.