Touchpad Backlight Module With Dual Light Guide Plates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional backlight modules typically offer only one or two light emitting modes, limiting their functionality and user experience in touchpad applications, where diverse lighting effects are needed for visibility and operation.
Innovation Solution
A backlight module with a first and second light guide plate, each with a microstructure, and light emitting elements on a circuit board, allowing for three distinct light emitting modes: a larger range, smaller range, and overlapped light emission, enhancing user interaction and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional backlight module uses a single light guide plate configuration, then the structure is simple, but the light emitting modes are limited to one or two modes only
Solution Approach 1:
The backlight module is divided into two independent light guide plate systems: a first light guide plate with first microstructures and a second light guide plate with second microstructures. Each system can operate independently or together, enabling multiple light emitting modes (first mode, second mode, and third mode) while maintaining manageable structural complexity through modular design
Solution Approach 2:
The two light guide plates are designed to serve multiple functions: the first light guide plate can emit light independently for the first light emitting mode, the second light guide plate can emit light independently for the second light emitting mode, and both can work together for the third light emitting mode, making each component multi-functional and versatile
2Area of stationary object
If the first light guide plate has a large area for wide light emission, then the light emitting range is large, but the precision of localized light control is reduced
Solution Approach 1:
Different regions of the backlight module have different light guide plate configurations optimized for their specific functions: the first light guide plate uses first microstructures for broad light distribution, while the second light guide plate uses second microstructures for localized light control in specific areas, allowing each region to have the quality needed for its purpose
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 provides a touchpad with versatile lighting options, improving user experience by offering a range of light emitting modes that can illuminate the touchpad and its surroundings, ensuring visibility and providing a dazzling effect, suitable for various electronic devices.
Implementation Method 1
The first light emitting element is located on a surface of the circuit board and corresponds to a side surface of the first light guide plate. The second light emitting element is located on an other surface of the circuit board and corresponds to a side surface of the second light guide plate.
Implementation Method 2
after the light source emits light into the light guide plate, light is uniformly emitted from the light exit surface of the light guide plate after being reflected and refracted by the light guide plate
Implementation Method 3
after the light source emits light into the light guide plate, light is uniformly emitted from the light exit surface of the light guide plate after being reflected and refracted by the light guide plate
Data Source
AI summary
A touchpad and a backlight module are provided. The backlight module includes a circuit board, a first light emitting element and a second light emitting element respectively located on two surfaces of the circuit board, a bottom layer, and a second light guide plate having a second microstructure, a middle layer having a light transmitting region and a first light guide plate having a first microstructure sequentially disposed on the bottom layer. A position of the second microstructure corresponds to the light transmitting region. An area of the light transmitting region of the middle layer is smaller than or equal to an area of the first microstructure. The first light emitting element corresponds to a side surface of the first light guide plate. The second light emitting element corresponds to a side surface of the second light guide plate.