Light Guide Plate With Integrated Edge Reflector
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Solution Overview
Problem
It is challenging to effectively prevent light leakage in thinner light guide plates used in compact electronic devices like laptops and smartphones without increasing the device's size and weight, as traditional reflective structures like tape are difficult to integrate due to space constraints.
Innovation Solution
A light guide plate with an integral reflective edge portion formed from reflective plastic materials like polycarbonate or polymethyl methacrylate, which scatters light and is molded in a two-shot process, combined with an opaque masking layer to block internal components and reduce light leakage, allowing for efficient backlight distribution without enlarging the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional reflective structures like tape are attached to edges of light guide plates, then light leakage is prevented, but device size and weight increase
Solution Approach 1:
The reflective structure is merged with the light guide plate by integrating it as an integral portion formed from the same plastic material through injection molding. This combines the light guide function and reflective function into a single unified component, eliminating the need for separate reflective tape attachments and avoiding additional weight from adhesives and separate materials.
Solution Approach 2:
The light guide plate is formed from a composite plastic material containing reflective particles or additives that provide the reflective property. This integrates the reflective function directly into the material composition of the light guide plate itself, eliminating the need for separate reflective structures and reducing overall device weight.
2Object-affected harmful factors
If the light guide plate thickness is increased to accommodate reflective structures, then light leakage is prevented, but device compactness is reduced
Solution Approach 1:
The reflective structure is integrated as an integral portion of the light guide plate formed through injection molding, allowing the reflective function to be incorporated without increasing the overall plate thickness. The reflective particles are embedded within the material volume rather than requiring additional external layers.
Solution Approach 2:
The reflective property is localized to specific regions or surfaces of the light guide plate where needed for light redirection, rather than requiring uniform thickness increase throughout the entire plate. This allows thin plate design with targeted reflective functionality at edges or specific zones.
3Illumination intensity
If separate reflective structures are added to light guide plates, then light reflection is improved, but manufacturing complexity increases
Solution Approach 1:
The light guide plate and reflective structure are merged into a single injection-molded component, eliminating multiple assembly steps involving adhesives, alignment, and attachment of separate reflective tape or films. The reflective particles are incorporated into the material before molding, creating a unified part that requires only a single manufacturing process.
Solution Approach 2:
The use of composite plastic material with embedded reflective particles allows the reflective function to be achieved through material composition rather than separate structural components. This simplifies manufacturing by eliminating the need for separate reflective element attachment processes and reduces assembly 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
This solution enhances backlight efficiency by reflecting light back into the light guide plate, minimizing size and weight increments while maintaining effective light distribution and aesthetics in compact electronic devices.
Implementation Method 1
The reflective second portion may include additives such as glass beads (microbeads) or other oxide particles that scatter light that is incident on the reflective second portion so that the light is reflected away from the reflective second portion
Implementation Method 2
The light guide plate distributes light across the back of a display panel by total internal reflection
Data Source
AI summary
An electronic device may be provided with a display. Backlight structures may be used to provide backlight for the display. The backlight structures may include a light guide plate. The light guide plate may include a planar extended portion that guides light along the back of the display and an integrated edge reflector along one or more edges of the planar extended portion. The planar extended portion and the integrated edge reflector may be formed from respective first and second shots of material. The integrated edge reflector may be formed from a polymer material with embedded reflective structures such as glass microbeads or other oxide particles. The backlight structures may include a reflective layer that is attached to the integrated edge reflector of the light guide plate using adhesive. The display may include active display pixels formed over a portion of the integrated edge reflector.