Glass-Ceramic Display Assembly for Polychromatic Light Transmission
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Solution Overview
Problem
Current glass-ceramic hobs have limited visibility of colors other than red due to low transmission factors in the visible spectrum, making it difficult to display various colors and animations, while also needing to conceal heating elements when not in use to prevent burns.
Innovation Solution
A display assembly using a lithium aluminosilicate glass-ceramic plate with specific optical transmission properties combined with a polychromatic light source emitting in multiple wavelengths, allowing for a wide range of color perception and animation effects by adjusting the emission spectrum of LEDs to match the glass-ceramic's transmission spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If glass-ceramic is tinted using vanadium oxide to achieve low visible light transmission for concealing heating elements, then safety and esthetics are improved, but color display capability deteriorates
Solution Approach 1:
The patent segments the visible spectrum into different wavelength ranges and uses separate light sources for each range. The blue LED (400-500 nm) provides high transmission for color display, while the red LED (>600 nm) provides visibility of heating elements when active. This segmentation allows each wavelength range to serve its specific function independently, resolving the contradiction between concealment and color display.
Solution Approach 2:
The patent changes the spectral parameters of the light sources to match the transmission characteristics of the glass-ceramic. By selecting LEDs with emission peaks in specific wavelength ranges where the glass-ceramic has high transmission, the system achieves both color display capability and heating element visibility. The vanadium oxide content is optimized to provide low overall transmission while maintaining transmission in specific spectral windows.
2Object-affected harmful factors
If glass-ceramic has low transmission factor in visible spectrum to conceal heating elements, then safety is improved, but visibility of displays deteriorates
Solution Approach 1:
The patent changes the wavelength parameter of the light sources to match the transmission windows of the glass-ceramic. The blue LED emits in the 400-500 nm range where the glass-ceramic has high transmission, ensuring good display visibility. The red LED emits at wavelengths >600 nm where transmission is also sufficient for visibility when heating elements are active. This parameter matching resolves the contradiction between concealment and display visibility.
Solution Approach 2:
The patent segments the illumination function into two separate light sources with different spectral characteristics. The blue LED is dedicated to providing high-visibility display illumination in the blue range, while the red LED provides supplementary illumination for viewing heating elements when active. This segmentation allows each source to be optimized for its specific function, resolving the visibility contradiction.
3Object-affected harmful factors
If glass-ceramic transmits red wavelengths for heating element visibility, then safety is improved, but color display capability deteriorates
Solution Approach 1:
The patent segments the spectral coverage into blue (400-500 nm) and red (>600 nm) ranges using separate LEDs. The blue LED provides the primary color display capability since the glass-ceramic has high transmission in this range, while the red LED supplements the visibility of heating elements. This segmentation allows the system to achieve full color perception through the combination of blue and red light, resolving the limitation of red-only transmission.
Solution Approach 2:
The patent makes the dual-LED system universal for both color display and heating element visibility functions. The blue LED serves the color display function, while the red LED serves both as a supplementary display source and as a heating element visibility source. This multi-functionality allows the system to overcome the limitation of single-wavelength transmission and achieve both color perception and safety visibility.
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
Enables the display of all perceivable shades of color and light intensity, providing infinite color and light intensity variations, and concealing heating elements when not in use, thus enhancing esthetics and safety.
Implementation Method 1
a luminous device 4 comprising at least one polychromatic light source 5 having at least a first emission of nonzero intensity at a wavelength between 400 and 500 nm and at least a second emission at a wavelength of more than 500 nm
Implementation Method 2
the optical transmission of which for a thickness of 4 mm is between 0.2% and 4% for at least one wavelength between 400 and 500 nm
Implementation Method 3
to grow within the glass crystals of β-quartz structure that have the particular feature of having a negative thermal expansion coefficient
Implementation Method 4
the presence, in the final glass-ceramic, of such crystals and of a residual glassy phase, makes it possible to obtain a zero or very low overall thermal expansion coefficient
Data Source
AI summary
Display assembly 1 comprising, on the one hand, a glass-ceramic plate 2 of the lithium aluminosilicate type, the optical transmission of which for a thickness of 4 mm is between 0.2% and 4% for at least one wavelength between 400 and 500 nm and, on the other hand, a luminous device 4, characterized in that the luminous device 4 comprises at least one polychromatic light source 5 having at least a first emission of nonzero intensity at said wavelength between 400 and 500 nm and at least a second emission of more than 500 nm, and such that the positioning of said source 5 is designed to allow display through said glass-ceramic plate 2.