Switchable Backlight Module With Specular and Diffuse Viewing Modes
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Solution Overview
Problem
Existing display devices with anti-peeping films have complex structures that increase costs and are not adaptable to different viewing angle requirements.
Innovation Solution
A backlight module with a light-guiding board and dual light bars, featuring specular and diffuse reflective surfaces, allowing switching between narrow and wide viewing angles by controlling the emission of light from separate light-emitting members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anti-peeping film is added to achieve real-time anti-peeping, then the anti-peeping function is improved, but the structure becomes complex and cost increases
Solution Approach 1:
The patent merges the anti-peeping function directly into the backlight module by integrating light-emitting members with different emission characteristics (narrow and wide viewing angles) into the backlight structure. This combines multiple functions (light emission and anti-peeping control) into a single integrated module, eliminating the need for separate anti-peeping films and reducing overall system complexity.
Solution Approach 2:
The backlight module is designed to perform multiple functions: it provides both narrow viewing angle emission (for anti-peeping) and wide viewing angle emission (for sharing) through different light-emitting members. This multi-functional design allows the backlight module to adapt to different usage scenarios without requiring additional components, thereby reducing structural complexity while maintaining reliable anti-peeping functionality.
2Reliability
If an anti-peeping film is added to achieve real-time anti-peeping, then the anti-peeping function is improved, but the cost increases
Solution Approach 1:
The patent merges the anti-peeping function directly into the backlight module by integrating light-emitting members with different emission characteristics (narrow and wide viewing angles) into the backlight structure. This combines multiple functions (light emission and anti-peeping control) into a single integrated module, eliminating the need for separate anti-peeping films and reducing overall system complexity.
Solution Approach 2:
The backlight module is designed to perform multiple functions: it provides both narrow viewing angle emission (for anti-peeping) and wide viewing angle emission (for sharing) through different light-emitting members. This multi-functional design allows the backlight module to adapt to different usage scenarios without requiring additional components, thereby reducing structural complexity while maintaining reliable anti-peeping functionality.
3Device complexity
If a fixed viewing angle structure is used, then the structure is simple, but the adaptability to different viewing angle requirements is reduced
Solution Approach 1:
The patent implements a dynamic viewing angle system by providing multiple light-emitting members (first light-emitting member for narrow angle, second light-emitting member for wide angle) that can be selectively activated. This allows the backlight module to dynamically adjust its emission characteristics based on different usage scenarios, achieving high adaptability while maintaining a relatively simple overall structure through selective activation rather than complex mechanical adjustments.
Solution Approach 2:
The patent applies local quality by using different light-emitting members with different emission characteristics in different regions or positions within the backlight module. The first light-emitting member provides narrow viewing angle emission for anti-peeping, while the second light-emitting member provides wide viewing angle emission for sharing. This localized differentiation allows the system to adapt to different viewing angle requirements without requiring a completely complex overall structure.
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 real-time anti-peeping functionality while simplifying the structure and reducing costs, providing adaptable viewing angles for privacy and sharing scenarios.
Implementation Method 1
the first light-guiding surface has a specular reflective surface
Implementation Method 2
the second light-guiding surface has a diffuse reflective surface
Data Source
AI summary
A backlight module and a display device are disclosed. The light-guiding structure includes a first light-guiding surface opposite to the first light-emitting member and a second light-guiding surface opposite to the second light-emitting member, the first light-guiding surface has a specular reflective surface, and the second light-guiding surface has a diffuse reflective surface. When the backlight module is configured in the first state, the first light-emitting member emits lights, the second light-emitting member does not emit lights. When the backlight module is configured in the second state, at least the second light-emitting member emits lights.