Light Guide Plate Anti-Peep Design via Prism Deflection
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Solution Overview
Problem
Current anti-peep display products require expensive high-reflective films to achieve privacy, which increases production costs and can lead to yield issues due to film degradation when exposed to water.
Innovation Solution
A light guide plate design featuring a stacked structure of a light guide layer, a first optical path control layer, and a second optical path control layer with prism structures that deflect light to achieve an anti-peep effect without the need for high-reflective films, using materials like organic glass or polycarbonate and water or salt water as the second optical path control layer to reduce costs and improve durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-reflective film is coated on the light guide plate to achieve anti-peep effect, then the privacy protection performance is improved, but the production cost increases and film degradation occurs when exposed to water
Solution Approach 1:
The patent replaces expensive high-reflective films with a cost-effective optical path control layer structure made of standard optical materials. The prism structures are formed through conventional molding processes, eliminating the need for expensive film coating while achieving the same anti-peep function through geometric light deflection rather than reflective coating
Solution Approach 2:
The patent substitutes the chemical/coating-based high-reflective film system with a geometric/optical structure system. The prism structures use total internal reflection and light refraction principles to deflect light away from side viewing angles, replacing the need for reflective coatings with a purely geometric optical solution that is more durable and cost-effective
2Reliability
If a high-reflective film is coated on the light guide plate to achieve anti-peep effect, then the privacy protection performance is improved, but the film degradation occurs when exposed to water reducing product yield
Solution Approach 1:
The patent replaces the vulnerable high-reflective film with a robust optical path control layer made of water-resistant optical materials. The prism structures are integral to the light guide plate body or molded as a single piece, eliminating the interface between film and substrate that causes degradation, thereby achieving long-term stability in humid environments
Solution Approach 2:
The patent uses composite optical path control structures combining multiple layers with different refractive indices (optical path control layer, light guide layer, and prism structures) to achieve both anti-peep function and environmental durability. The layered composite structure allows each layer to be optimized for its specific function while maintaining overall system stability in water-exposed conditions
3Ease of manufacture
If prism structures are added to the light guide plate to achieve anti-peep effect without high-reflective film, then production cost is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent merges the optical path control function and the light guide structure into a single integrated component. The prism structures are either molded directly into the light guide plate or formed as an integral part of the optical path control layer, eliminating the need for separate assembly steps and reducing overall device complexity despite the added optical functionality
Solution Approach 2:
The optical path control layer serves multiple functions simultaneously: it guides light from the edge source, creates the anti-peep effect through prism deflection, and maintains structural integrity of the display assembly. This multi-functionality reduces the need for additional components, offsetting the initial structural complexity with functional consolidation
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 design enhances light collimation and achieves an anti-peep effect while reducing production costs and preventing film degradation, improving product yield and efficiency.
Implementation Method 1
the refractive index of the light guide layer is greater than the refractive index of the second optical path control layer, and the refractive index of the second optical path control layer is smaller than or equal to the refractive index of the first optical path control layer; and wherein the first optical path control layer is configured to deflect the light that enters the first optical path control layer from the light guide layer through the second optical path control layer
Implementation Method 2
a plurality of prism structures are provided on a side of the first optical path control layer distal to the second optical path control layer
Implementation Method 3
the first optical path control layer is configured to deflect the light that enters the first optical path control layer from the light guide layer through the second optical path control layer
Data Source
AI summary
A light guide plate, a backlight module and a display device are disclosed. The light guide plate includes: a first optical path control layer, a second optical path control layer, and a light guide layer that are sequentially stacked. A plurality of prism structures are provided on a side of the first optical path control layer distal to the second optical path control layer. The first optical path control layer, the second optical path control layer, and the light guide layer all extend in a first direction. The first optical path control layer is configured to deflect the light that enters the first optical path control layer from the light guide layer through the second optical path control layer, so that the deflected light passes through the second optical path control layer and is emitted from the light exit surface of the light guide layer.