Backlight Module Anti-Peeping Structures
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Solution Overview
Problem
Liquid crystal display apparatuses face high costs and power consumption due to the use of polymer dispersed liquid crystals (PDLC) for anti-peeping modes, which require external electric fields and are expensive.
Innovation Solution
A backlight module with an edge-type light source, a light guide plate, and an anti-peeping component featuring anti-peeping structures with specific surface geometries and refractive index differences, allowing for anti-peeping and sharing modes without PDLC, reducing costs and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer dispersed liquid crystals (PDLC) are used for anti-peeping modes, then anti-peeping function is achieved, but cost and power consumption increase
Solution Approach 1:
The patent extracts and removes the PDLC material from the backlight module structure, replacing it with a light guide plate and anti-peeping component system that achieves the same anti-peeping function through optical geometry and refraction principles rather than through the PDLC material's electro-optic properties
Solution Approach 2:
The patent replaces the electrical field-based PDLC control system with an optical geometry-based system using light guide plates and anti-peeping components with specific surface shapes and refractive indices, eliminating the need for external electric fields and reducing power consumption
2Reliability
If polymer dispersed liquid crystals (PDLC) are used for anti-peeping modes, then anti-peeping function is achieved, but cost increases
Solution Approach 1:
The patent extracts and removes the expensive PDLC material from the structure, replacing it with standard optical components (light guide plate, anti-peeping component) that are cheaper to manufacture and integrate
Solution Approach 2:
The patent uses inexpensive optical materials and geometric structures instead of expensive PDLC material, achieving the anti-peeping function through design rather than through costly materials
3Reliability
If PDLC is used for anti-peeping modes, then anti-peeping function is achieved, but external electric fields are required
Solution Approach 1:
The patent replaces the electrical field-based control mechanism with an optical geometric system that uses light guide plates and anti-peeping components with specific surface shapes and refractive indices to achieve the same anti-peeping function without requiring external electric fields
Solution Approach 2:
The patent removes the requirement for external electric fields by eliminating the PDLC material that necessitated such fields, thereby simplifying the device operation and control system
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 enables effective anti-peeping and sharing modes with reduced half-brightness and cut-off angles, lowering the backlight module's costs and power consumption, and thus the display apparatus's overall costs and power usage.
Implementation Method 1
a refractive index of a dielectric in contact with the backlight surface of the first light guide plate is less than a refractive index of the first light guide plate
Implementation Method 2
the first light source is an edge-type light source of the first light guide plate
Data Source
AI summary
A backlight module includes a first light source, a first light guide plate, and an anti-peeping component, wherein the first light source is an edge-type light source of the first light guide plate, the first light guide plate is provided with a light emitting surface and a backlight surface that are opposite, wherein the anti-peeping component is on the light emitting surface, a refractive index of a dielectric in contact with the backlight surface is less than a refractive index of the first light guide plate; the anti-peeping component includes anti-peeping structures that is provided with a first surface proximal to the first light guide plate, a second surface distal from the first light guide plate, and two opposite third surfaces intersecting both the first surface and the second surface, an included angle between the third surface and the first surface being an obtuse angle.