Touch Module Reflector Plate Light Distribution Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Chip scale package light emitting diodes (CSP LEDs) have a wide light emitting angle, making it difficult to directly place a light source under a pattern and adjust brightness effectively, resulting in suboptimal lighting effects due to the inability to control light distribution.
Innovation Solution
A touch module comprising a circuit board, light emitting elements, a light guide plate, and a reflector plate, where the reflector plate includes light-transmitting, light-shielding, and light-reflecting regions to disperse and reflect light energy onto the light guide plate, optimizing lighting effects by varying the arrangement of microstructures based on light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a CSP LED with wide light emitting angle is directly placed under a pattern, then the light source can illuminate the pattern, but the lighting effect is suboptimal due to excessive light sources and inability to adjust brightness
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the CSP LED and the pattern. The light guide plate receives light from the LED and guides it to illuminate the pattern, enabling brightness adjustment and optimizing lighting effects while resolving the issue of excessive direct light sources
Solution Approach 2:
The reflector plate is divided into multiple functional regions: a light-shielding region, a light-transmitting region, and light-reflecting regions. This segmentation allows precise control of light distribution, directing light to specific areas and preventing light leakage, thereby optimizing illumination intensity and brightness control
2Illumination intensity
If the light source is directly placed under the pattern, then illumination is achieved, but light distribution cannot be controlled resulting in suboptimal lighting effects
Solution Approach 1:
Different regions of the reflector plate are assigned different optical properties: the light-shielding region blocks light, the light-transmitting region allows light passage, and the light-reflecting regions redirect light. This local differentiation enables precise control of light distribution and optimizes lighting effects across different areas
3Ease of manufacture
If microstructures are uniformly distributed in the light guide plate, then manufacturing is simplified, but lighting effects are suboptimal due to inability to adjust for varying light intensity
Solution Approach 1:
The light guide plate features non-uniformly distributed microstructures with varying densities in different regions. Areas with higher light intensity have different microstructure characteristics compared to areas with lower light intensity, enabling optimized light distribution and enhanced lighting effects while maintaining manufacturing feasibility
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 touch module achieves optimized lighting effects by dispersing light energy and adjusting the distance between the light source and pattern, minimizing the size of light emitting elements and preventing light leakage, thereby enhancing the clarity and intensity of displayed patterns.
Implementation Method 1
the first light-reflecting region and the second light-reflecting region reflect the light back to the light guide plate
Implementation Method 2
The light-transmitting region allows light to transmit through
Implementation Method 3
the light-shielding region prevents the light from transmitting through
Implementation Method 4
The light guide plate is arranged above the circuit board... reflect the light back to the light guide plate
Data Source
AI summary
A touch module includes a circuit board, a light emitting element, a light guide plate, and a reflector plate. The light emitting element is electrically connected to the circuit board, and the light emitting element has an upper light emitting surface. The light guide plate is arranged above the circuit board. The reflector plate is arranged above the light guide plate. The reflector plate includes a first surface facing the light guide plate. The first surface is provided with a light-transmitting region, a light-shielding region, and a light-reflecting region. The light-reflecting region is arranged corresponding to the light emitting element. An area of the light-shielding region is greater than an area of the light-reflecting region. The area of the light-reflecting region is greater than an area of the upper light emitting surface of the light emitting element.