Backlight Module Shading Plate Alignment for Anti-Peep Mode
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Solution Overview
Problem
Existing display technologies lack a flexible method to conveniently switch between normal and anti-peep modes, as current solutions require manual attachment and detachment of anti-peep films, which is inconvenient for users.
Innovation Solution
A backlight module comprising a light guide plate with diffusion dots and a shading plate with shading regions, where the relative position between the two can be adjusted by a driving unit to align or stagger, allowing for easy switching between anti-peep and normal display modes by aligning or staggering the shading regions with the diffusion dots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If an anti-peep film is attached on the display device to prevent information leakage, then information security is improved, but the device complexity and ease of operation deteriorate due to the need for manual attachment and detachment
Solution Approach 1:
The patent makes the shading plate movable relative to the light guide plate, allowing dynamic switching between anti-peep mode (aligned) and normal display mode (staggered). This resolves the contradiction by enabling easy mode switching without manual film attachment/detachment, improving ease of operation while maintaining information security when needed.
Solution Approach 2:
The patent introduces a driving unit as an intermediary mechanism between the user and the shading plate. This mediator automatically performs the alignment/staggering action, eliminating the need for users to manually handle anti-peep films, thus improving ease of operation while achieving the same information protection function.
2Ease of operation
If a driving unit is added to enable automatic switching between modes, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The driving unit serves multiple functions: it moves the shading plate to achieve both anti-peep mode and normal display mode, and can be integrated with existing display control systems. This multi-functionality justifies the added complexity by providing comprehensive mode switching capability within a single mechanism.
Solution Approach 2:
The shading plate is positioned between the light guide plate and the display panel, nesting the anti-peep function within the existing backlight structure. The driving unit is integrated into this nested arrangement, allowing mode switching without adding external components, thus minimizing the increase in device complexity.
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 users to conveniently switch between anti-peep and normal display modes by adjusting the relative position of the shading plate and light guide plate, effectively controlling light distribution to prevent information leakage while maintaining normal display functionality.
Implementation Method 1
The collimated light source generates collimated light vertically irradiating on the shading plate
Implementation Method 2
a plurality of diffusion dots formed on the transparent main body
Data Source
AI summary
The present disclosure provides a backlight module, a method for operating the same and a display device including the backlight module. The backlight module comprises a light guide plate, a collimated light source and a shading plate between the light guide plate and the collimated light source. The light guide plate comprises a transparent main body and a plurality of diffusion dots formed on the transparent main body. The shading plate comprises a plurality of shading regions corresponding to the plurality of diffusion dots of the light guide plate. The collimated light source generates collimated light vertically irradiating on the shading plate.