Double-Side Light Guide Plate with Segmented Grooves
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Solution Overview
Problem
Conventional light guide plates are limited to single-side display devices, as they can only emit light from one emitting surface, failing to meet the requirements of double-side display devices.
Innovation Solution
A manufacturing method for a light guide plate involving alternating first and second grooves on a transparent substrate, where the first groove has a reflective layer and the second groove has a transmissive layer, allowing for light to be reflected and transmitted on both sides, enabling a double-side display device configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional light guide plate with single emitting surface is used, then the structure is simple and manufacturing is easy, but it can only emit light from one side and cannot meet the requirements of double-side display devices
Solution Approach 1:
The light guide plate is segmented into multiple functional regions: a first light guide region with a first emitting surface for light emission, and a second light guide region with a second emitting surface for light reception. This segmentation enables the plate to function as both a light emitter and a light receiver on opposite sides, achieving double-side display capability while maintaining a relatively simple overall structure.
Solution Approach 2:
The light guide plate is designed to perform multiple functions: it guides light from a light source, emits light through the first emitting surface, and receives external light through the second emitting surface. This multi-functionality allows a single component to replace what would traditionally require separate elements, enabling double-side display without proportionally increasing device complexity.
2Illumination intensity
If optical grid points are provided on the lower surface to break total reflection, then light distribution uniformity is improved, but light transmission is blocked and double-side display is not enabled
Solution Approach 1:
Different regions of the light guide plate are assigned different optical properties. The first light guide region contains optical grid points on its lower surface to achieve uniform light emission, while the second light guide region has a transparent lower surface without grid points to allow external light transmission. This local differentiation enables both uniform light distribution and light transmission capability within the same device.
3Adaptability or versatility
If the entire lower surface is made transparent to enable light reception, then double-side display is enabled, but light distribution uniformity and emission control are compromised
Solution Approach 1:
The light guide plate is divided into a first light guide region with an opaque lower surface containing optical grid points for controlled light emission, and a second light guide region with a transparent lower surface for light reception. This spatial segmentation allows each region to optimize its function: one for uniform light emission, the other for light reception, thereby achieving both goals simultaneously.
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 method allows for a double-side display device capable of displaying images on both sides, improving light distribution and preventing interference from external light, thus enhancing display quality and functionality.
Implementation Method 1
a first reflective layer on a surface of the first groove
Implementation Method 2
a second reflective layer only on a side surface of the second groove
Data Source
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AI summary
A manufacturing method of the light guide plates, a light guide plate made by the method and a double-side display device comprising the light guide plate. The manufacturing method of a light guide plate comprises: forming a plurality of alternating first grooves (101) and second grooves (102) on a surface of a transparent substrate (100); forming a first reflective layer (300) on a surface of the first groove (101); and forming a transparent protective layer (500) on the entire surface of the substrate. According to the present disclosure, a light guide plate is provided that can be used in the double-side display device.