Smart Card LED Color Filtering Without Circuit Modification
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Solution Overview
Problem
The production of smart cards with luminous indicators of different colors is costly and complex due to the need for modifying the antenna circuit and diode configurations to achieve distinct resonance frequencies and colors, leading to increased production and development costs.
Innovation Solution
A microcircuit card with a light-emitting diode having a cover coated with a material that filters wavelengths to change the emitted color without altering the diode or antenna circuit configuration, allowing for multiple colors from a single diode and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna circuit and diode configuration are modified to achieve distinct resonance frequencies for different colors, then different colored indicator lights can be obtained, but production and development costs increase significantly
Solution Approach 1:
The patent applies color filtering by coating the diode cover with a mass of material that selects specific wavelengths from the emitted light. Instead of changing the diode's semiconductor junction to produce different colors, the invention uses optical filtering to transform the emitted light into different perceived colors, thereby achieving color variety without modifying the electrical configuration or resonance frequency of the antenna circuit.
2Manufacturing precision
If the antenna circuit configuration is adjusted for each color variant, then resonance frequency matching is achieved, but production time and equipment adjustments increase
Solution Approach 1:
The patent makes the antenna circuit and diode configuration universal by maintaining a single standardized design that works for all color variants. The color differentiation is achieved through the filtering material applied to the diode cover rather than through different electrical configurations, allowing the same antenna circuit to support multiple colors without requiring reconfiguration or specialized production lines for each color type.
3Adaptability or versatility
If multiple diodes with distinct semiconductor junctions are used for different colors, then color accuracy is improved, but the number of components and production steps increases
Solution Approach 1:
The patent segments the color selection function from the diode itself by introducing a separate filtering layer on the diode cover. Instead of relying on the diode's semiconductor junction to determine color, the invention separates the light generation function (performed by the diode) from the color determination function (performed by the filtering material), allowing color variety to be achieved through material coating rather than through multiple diode types.
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 approach enables the production of smart cards with various colored indicators at reduced costs and simplified manufacturing, as the configuration of the antenna circuit and diode remains unchanged across different colors, reducing production complexity and equipment adjustments.
Implementation Method 1
the cover of the diode is coated with a mass of material forming means for selecting a set of wavelengths among those composing the first color so that the light transmitted by the mass has a different second predefined color
Data Source
Figure 1~3
AI summary
The microcircuit card (10) comprises a body (12) comprising a LED with a lid capable of emitting a first predefined color and an antenna circuit for near field communication. The LED emits light when a preset current intensity flows in the circuit. The lid of the LED is coated with a mass of material forming a unit for selecting a set of wavelengths. The first predefined color is white. The LED comprises a semiconductor junction for emitting wavelengths in a primary spectral region and a unit for converting wavelengths of the primary region towards a secondary spectral region. The microcircuit card (10) comprises a body (12) comprising a LED with a lid capable of emitting a first predefined color and an antenna circuit for near field communication. The LED emits light when a preset current intensity flows in the circuit. The lid of the LED is coated with a mass of material forming a unit for selecting a set of wavelengths. The first predefined color is white. The LED comprises a semiconductor junction for emitting wavelengths in a primary spectral region and a unit for converting wavelengths of the primary region towards a secondary spectral region corresponding to the first predefined color. The primary spectral region extends from 370-420 nm or 420-480 nm, and the secondary spectral region extends in the set of visible spectrum. The mass material comprises a resin polymerizable in UV light and/or a thermohardening resin. The configuration of the antenna circuit and the LED is defined by configuration parameters including length of an antenna wire of the circuit, a gap between two turns of the antenna, width of the antenna wire, a number of antenna towers and a capacity of a semiconductor junction of the LED. The antenna circuit comprises a microcircuit and an antenna connected to the microcircuit. The LED is a surface mount component. An independent claim is included for a process for fabrication of a microcircuit card.