Backlight Module Anti-Peeping Light Control Film
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Solution Overview
Problem
Conventional liquid crystal display devices face inconvenience and reduced brightness when attempting to achieve anti-peeping modes, as existing methods require manual placement of anti-peeping sheets or liquid crystal boxes, which can cause optical interference and diminish display quality.
Innovation Solution
A backlight module comprising a first and second light guide plate, a light control film with light-shielding microstructures, and a reflector, allowing for seamless switching between sharing and anti-peeping modes without additional optical elements, maintaining display brightness and avoiding interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-peeping sheet or liquid crystal box is configured on the display to achieve anti-peeping effect, then large angle light is filtered, but display brightness is greatly reduced and optical interference occurs
Solution Approach 1:
The backlight module is divided into two independent light guide plates (first and second light guide plates) with separate light emitting units. The light control film with light-shielding microstructures is positioned between them to selectively control light distribution. This segmentation allows independent control of lighting modes without using traditional anti-peeping sheets that reduce overall brightness.
Solution Approach 2:
The light control film serves as an intermediary element between the two light guide plates. It contains light-shielding microstructures that selectively block or transmit light based on viewing angle, achieving anti-peeping effect without the need for external anti-peeping sheets that would reduce display brightness.
2Object-affected harmful factors
If an anti-peeping sheet or liquid crystal box is manually placed on the display, then anti-peeping function is achieved, but operation convenience is reduced
Solution Approach 1:
The backlight module integrates the anti-peeping function directly into its structure through the light control film with light-shielding microstructures. The system automatically provides anti-peeping effect when needed without requiring manual intervention to place or remove anti-peeping sheets, making the anti-peeping function self-service and operationally convenient.
Solution Approach 2:
The anti-peeping function is merged into the backlight module structure itself by integrating the light control film between the two light guide plates. This combination eliminates the need for separate, manually operable anti-peeping sheets, thereby improving ease of operation while maintaining anti-peeping effectiveness.
3Object-affected harmful factors
If an anti-peeping sheet or liquid crystal box is configured on the display, then anti-peeping effect is achieved, but device complexity increases
Solution Approach 1:
The anti-peeping function is merged into the backlight module structure by integrating the light control film between the two light guide plates. This consolidation reduces device complexity by eliminating the need for separate anti-peeping sheets or liquid crystal boxes, achieving anti-peeping effect through the inherent structure of the backlight system.
Solution Approach 2:
The backlight module is designed with multi-functionality, serving both as the light source and as the anti-peeping mechanism. The light control film with light-shielding microstructures performs dual functions: controlling light distribution for normal display and providing anti-peeping effect, thereby reducing the need for additional specialized components and simplifying the overall device 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
The solution effectively reduces light intensity at large viewing angles for anti-peeping, enabling convenient mode switching while preserving display brightness and preventing optical interference, thus enhancing the display's functionality and user experience.
Implementation Method 1
The light control film has a plurality of light-shielding microstructures arranged along a first direction and extending along a second direction
Implementation Method 2
The first light emitting unit is disposed on a first side surface of the first light guide plate. The second light emitting unit is disposed on a second side surface of the second light guide plate
Data Source
AI summary
A backlight module including a first light emitting unit, a first light guide plate, a second light emitting unit, a second light guide plate and a light control film is provided. The first light emitting unit is disposed on a first side surface of the first light guide plate. The second light emitting unit is disposed on a second side surface of the second light guide plate. The light control film is disposed between the first light guide plate and the second light guide plate. The light control film has a plurality of light-shielding microstructures arranged along a first direction and extending along a second direction. The first direction is perpendicular to the second direction.