Instrument Cluster Gauge Single Circuit Board LED Integration
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Solution Overview
Problem
The integration of a liquid crystal display (LCD) in vehicle gauges complicates assembly and increases complexity and cost due to the requirement of multiple printed circuit boards to support the LCD, light sources, and motor components.
Innovation Solution
A single circuit board is used to mount light emitting diodes (LEDs) for illuminating both the pointer and the LCD, with a motor, and includes segments that control light transmission to the pointer as it rotates, reducing the number of parts and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple printed circuit boards are used to support the LCD, light sources, and motor components, then the gauge can provide comprehensive functionality with LCD display and pointer illumination, but the assembly complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple previously separate components (LCD, light sources, motor, and circuit board) into a single integrated assembly. The circuit board is positioned to simultaneously support the LCD at its center, mount the motor at its periphery, and hold multiple light sources, eliminating the need for separate support structures and reducing assembly complexity while maintaining full functionality
2Adaptability or versatility
If multiple printed circuit boards are used to support the LCD, light sources, and motor components, then the gauge can provide comprehensive functionality, but the manufacturing cost increases
Solution Approach 1:
The patent integrates multiple components onto a single circuit board, reducing the total number of parts that need to be manufactured, procured, and assembled. This consolidation reduces manufacturing costs by eliminating redundant support structures and simplifying the supply chain for multiple separate components
3Device complexity
If a single circuit board is used to mount LEDs and motor, then the number of parts is reduced and assembly is simplified, but the circuit board must perform multiple functions simultaneously
Solution Approach 1:
The circuit board is designed as a multi-functional platform that simultaneously serves as a mounting structure for the LCD, a support for the motor, a platform for light sources, and an electrical circuit carrier. This universal design allows a single component to perform multiple functions that previously required separate dedicated components
Solution Approach 2:
The patent merges the functions of multiple separate components into a single circuit board assembly, where electrical, mechanical, and optical functions are integrated into one unified structure, reducing the overall part count while maintaining system functionality
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 configuration reduces the number of components and assembly costs while providing efficient illumination and display functionality for vehicle speed and other operating parameters, enhancing the gauge's simplicity and effectiveness.
Implementation Method 1
A plurality of light emitting diodes (LEDs) are mounted on a single circuit board and oriented to illuminate both the LCD and the pointer
Implementation Method 2
The LEDs broadcast light through a light guide for directing light both into the pointer and to backlight the LCD
Implementation Method 3
The LCD includes a plurality of segments disposed annularly about its periphery. Each of these segments is selectively switchable between an on condition and an off condition. In the on condition light is allowed to pass through the LCD and onto the reflective surface of the pointer
Data Source
AI summary
A dial gauge assembly includes a single circuit board that supports light emitting diodes for both illuminating a pointer and backlighting a liquid crystal display. The dial gauge assembly controls illumination of the pointer by switching on and off a plurality of segments disposed within the LCD.