Display device, particularly for cooktops
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Solution Overview
Problem
The limited color spectrum available on modern glass ceramic cooking appliance surfaces due to the coloring of the glass ceramic and the restricted color options of LED displays restricts the ability to provide clear and varied user information, such as the status of cooking zones and heat levels, which is not aesthetically pleasing and lacks user-friendly guidance.
Innovation Solution
The use of a compensation filter in conjunction with the glass ceramic substrate allows for the expansion of the color spectrum by adjusting the transmission and color impression independently, enabling the creation of desired color impressions for signal lamps or display units, including white compensation, using commercially available LED light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the glass ceramic cooking surface uses its inherent coloring and limited LED display options, then the design remains simple and inexpensive, but the color spectrum for user information is very limited and mostly restricted to red or orange
Solution Approach 1:
A compensation filter is introduced as an intermediary element between the LED light source and the glass ceramic cooking surface. This filter has a complementary transmission spectrum to the glass ceramic's absorption characteristics, allowing it to compensate for the color distortion caused by the glass ceramic. The filter enables white LEDs to appear white through the cooking surface, while other colored LEDs can display their intended colors, thereby expanding the color spectrum for user information without requiring fundamental changes to the display device structure.
2Ease of manufacture
If a white LED is used as the light source, then the design is simplified and cost-effective, but the user perceives a yellow cast due to the transmission profile of the glass ceramic
Solution Approach 1:
The compensation filter is specifically designed with a transmission spectrum that compensates for the color distortion introduced by the glass ceramic. When white LED light passes through the compensation filter and then the glass ceramic, the filter's spectral characteristics counteract the glass ceramic's absorption, resulting in the white LED appearing white to the user rather than yellow. This allows manufacturers to continue using cost-effective white LEDs while achieving accurate color perception.
3Adaptability or versatility
If the transmission spectrum of the glass ceramic is expanded to include blue wavelengths, then blue light can be transmitted for display purposes, but the number of colors visible to the user remains severely limited due to the small number of differently colored LED displays available
Solution Approach 1:
The compensation filter enables a parameter change in the perceived color output by transforming the relationship between the LED light source spectrum and the glass ceramic transmission profile. With the filter in place, standard commercially available LED colors (red, green, blue, white) can all be displayed with accurate color perception through the glass ceramic surface. This effectively multiplies the number of usable display colors without needing to procure a large variety of differently colored LEDs, as each LED type can now be used for its intended color purpose.
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 a wide range of color impressions, including white, enhancing user guidance and aesthetics by providing a robust, inexpensive, and flexible design for display devices, while maintaining the non-transparent appearance of the cooking surface.
Implementation Method 1
The total transmission of the substrate τges(λ) is made up of the transmissions of the glass ceramic τGK(λ) and the compensation filter τKF(λ) together
Data Source
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AI summary
The invention relates to a display device, particularly for cooktops, having a glass ceramic body, particularly a glass ceramic panel, forming a glass ceramic front face and a glass ceramic rear face, and a luminous element disposed in the region of the glass ceramic rear face. In order to, in a simple manner, cost-effectively implement optional color inlays that can be determined in advance, according to the invention, an optical compensation filter is disposed between the glass ceramic front face and the luminous element.