Glass-Ceramic Luminous Display With Filtered Color Correction
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Solution Overview
Problem
Glass-ceramic plates with dark or colored finishes struggle to accurately display white or synthetic colors due to non-uniform absorption across the visible spectrum, leading to color distortion when used with light-emitting diodes (LEDs), particularly with polychromatic LEDs like RGB LEDs, which are bulky and difficult to integrate effectively.
Innovation Solution
A glass-ceramic article with a luminous transmission range of 0.8% to 40% and optical transmission of at least 0.1% in the visible range, combined with a filter that compensates for the spectral dispersion of the glass-ceramic, allowing precise color rendering by adjusting the transmission of light sources such as LEDs, enabling the creation of desired colored zones, including white, without altering the initial color of the source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dark or colored glass-ceramic plates are used to achieve aesthetic appearance and hide heating elements, then the visual appeal and safety are improved, but the color rendering accuracy deteriorates due to non-uniform absorption across the visible spectrum
Solution Approach 1:
A corrective filter is introduced as an intermediary element between the light source and the glass-ceramic plate. This filter compensates for the non-uniform absorption characteristics of the dark glass-ceramic by pre-adjusting the spectral composition of the incident light, thereby restoring accurate color rendering while maintaining the aesthetic benefits of the dark plate
Solution Approach 2:
The spectral parameters of the light source are modified by applying a corrective filter that adjusts the intensity distribution across different wavelengths. This parameter change compensates for the wavelength-dependent absorption of the glass-ceramic material, enabling accurate color display despite the dark substrate
2Adaptability or versatility
If polychromatic LEDs like RGB LEDs are used to achieve diverse color display, then the color variety is improved, but the device complexity and integration difficulty increase due to bulky structure and mixing requirements
Solution Approach 1:
The complex RGB LED assembly is replaced by extracting only the essential function of polychromatic light emission. Instead of using three separate LEDs with complex mixing requirements, a single light source combined with a corrective filter is used to achieve the same color variety while simplifying the device structure and integration
Solution Approach 2:
Rather than directly implementing complex RGB LED systems, the patent uses a simplified optical system that copies the essential function of polychromatic emission. A single light source with spectral adjustment via filter achieves comparable color versatility without the structural complexity of multiple LEDs and their associated control circuits
3Ease of manufacture
If standard LEDs are used with dark glass-ceramic plates to achieve simple integration, then the ease of manufacture is improved, but the color rendering accuracy deteriorates due to spectral distortion
Solution Approach 1:
A corrective filter serves as an intermediary component that bridges the gap between simple LED integration and accurate color rendering. This filter is easily integrated into the existing simple structure while significantly improving color rendering accuracy by compensating for the glass-ceramic's non-uniform absorption
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 solution allows for accurate and uniform color display across a range of colors, including white, on glass-ceramic plates, without compromising their thermal properties or requiring complex LED adjustments, making it suitable for dark or colored glass-ceramic plates and ensuring consistent color rendering regardless of the light source used.
Implementation Method 1
the nonuniform absorption of the glass-ceramic over the visible range changes the balance between the colors
Implementation Method 2
at least one filter (coupled (in operation) to said source (and likewise to the plate, the colored zone obtained especially resulting from (the action/effect of) these three components)) so as to form, in particular, at least one colored luminous zone
Data Source
AI summary
The present invention relates to an article having at least one colored luminous zone, in particular a display zone, said article comprising at least one glass-ceramic substrate having a luminous transmission ranging from 0.8% to 40% and an optical transmission of at least 0.1% for at least one wavelength in the range extending from 420 to 780 nm, at least one light source and at least one filter so as to form at least one colored luminous zone, in particular a display zone, in at least one zone of the plate.