DE102015104304A1 - Display for a glass-ceramic plate - Google Patents

Display for a glass-ceramic plate

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Publication number
DE102015104304A1
DE102015104304A1 DE102015104304.1A DE102015104304A DE102015104304A1 DE 102015104304 A1 DE102015104304 A1 DE 102015104304A1 DE 102015104304 A DE102015104304 A DE 102015104304A DE 102015104304 A1 DE102015104304 A1 DE 102015104304A1
Authority
DE
Germany
Prior art keywords
light
characterized
quantum dots
spectral
display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE102015104304.1A
Other languages
German (de)
Inventor
Volker Ennen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Miele and Cie KG
Original Assignee
Miele and Cie KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Miele and Cie KG filed Critical Miele and Cie KG
Priority to DE102015104304.1A priority Critical patent/DE102015104304A1/en
Publication of DE102015104304A1 publication Critical patent/DE102015104304A1/en
Application status is Pending legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24COTHER DOMESTIC STOVES OR RANGES; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00Details
    • F24C15/10Tops, e.g. hot plate; Rings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24COTHER DOMESTIC STOVES OR RANGES; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00Stoves or ranges heated by electrical energy
    • F24C7/08Arrangement or mounting of control or safety devices

Abstract

The invention relates to a display (10) for a glass-ceramic plate (12) with a wavelength-dependent transmission characteristic. Such a display (10) comprises a translucent device (16) for generating a polychromatic light having a first spectral distribution (30, 32, 34) which absorbs high energy / small wavelength photons and emits low energy / long wavelength photons in such a way that the light has a predetermined second spectral distribution (40, 42, 44) as a function of the transmission characteristic when it transilluminates the plate (12). The invention further relates to a hob (10, 12) with such a display (10).

Description

  • The invention relates to a display for a glass-ceramic plate according to the preamble of claim 1 and a hob according to the preamble of claim 13.
  • The cooktop is the upper part of a cooker, the heat generating zones for heating food or liquids, e.g. in pots or pans. The prior art includes, for example, glass ceramic cooktops with a continuous plate on which several hotplates are marked. Commercially available glass-ceramic plates are characterized by a low attenuation constant for parts of the infrared spectrum in order to enable heat transfer on the basis of thermal radiation.
  • Below the hob at least one heating element is arranged. The at least one heating element may be associated with a particular cooking location. There are also so-called area hobs are known in which a hotplate is not marked separately, but depending on the size and position of a arranged on the cooktop cooking tank several heating elements are operated together.
  • A heating element is suitable for at least partially heating at least one cookware. It is basically a matter of priority whether such heating is carried out directly or indirectly. Thus, a heating element may be formed, for example, according to the principle of electrical resistance heating as a heating coil, which heats itself by applying an electrical voltage. By heating such a heating element, the carrier plate above it and possibly also arranged thereon cookware are also heated. It is also conceivable that the heating element is formed by an inductor, by means of which electrical eddy currents in a cookware are inducible. In such a method, not the heating element itself is heated, but only the respective cookware. It is also subordinate, which size has a heating element. Thus, heating coils with a diameter of several centimeters to a few decimeters are just as conceivable as small inductors with a diameter of a few centimeters.
  • In order to hide heating elements located below the hob in front of the user, corresponding plates for hobs usually have a wavelength-dependent transmission characteristic that absorbs parts of the visible light. The integration of display elements in such - for example, with vanadium oxide-colored - plates is a technical challenge, since polychromatic light, depending on the transmission characteristic of the plate changes its spectral distribution when it transilluminates the plate.
  • To compensate for the described phenomenon, suggests DE 20 2011 052 226 U1 the use of an optical compensation filter between the glass ceramic front side and a rear light source. WO2011089327 A1 however, discloses the use of a polychromatic light emitting device which emits at a first wavelength of 400 to 500 nm and at least a second wavelength beyond 500 nm in order to obtain a display of all perceived by the human eye color shades given transmission characteristic of the plate.
  • These known approaches require considerable energy because they either have to compensate for the radiation absorbed by any filter or the increased need for a polychromatic light device by adding additional energy.
  • The invention thus presents the problem of providing an energy-efficient display for a glass-ceramic plate whose light has a predetermined spectral distribution when it transilluminates the plate.
  • According to the invention this problem is solved by a display with the features of claim 1 and a hob with the features of claim 13. Advantageous embodiments and modifications of the invention will become apparent from the respective following subclaims.
  • The achievable with the invention advantages are in addition to a reduced energy consumption in the structural simplicity and adaptability of a corresponding display. These advantages are based on the use according to the invention of a nanoscopic material structure known as a quantum dot, whose electronic and optical properties can be purposefully controlled by suitable production methods. Thanks to this innovation, the proposed display is characterized by a precise spectral distribution, although it requires only a single radiation source to excite the quantum dots used. By dispensing with an additional compensation filter, the device according to the invention avoids the additional energy requirement associated with a partial absorption of the emitted spectrum.
  • An embodiment of the invention is shown purely schematically in the drawing and will be described in more detail below. The figure illustrates at the same time the structural design of a hob according to the invention and the operation of its integrated display device.
  • Central component of the illustrated hob 10 . 12 is a continuous glass-ceramic plate 12 with a plurality of - not graphically represented - heat-generating cooking zones. For heat generation serve below the plate 12 arranged heating elements, which are also not covered by the figure. In this context, glass-ceramic is understood as meaning any material which can be produced from glass melt by controlled crystallization and converted by means of a suitable temperature treatment into a partly polycrystalline and partly glassy or ceramic state.
  • For aesthetic considerations, the plate is 12 of the cooking hob in question 10 . 12 colored to block parts of the visible spectrum, but should have a low attenuation constant for parts of the infrared spectrum. For this purpose, the plate was 12 Manufacturing technology, a wavelength-dependent transmittance τ (λ) awarded. The transmittance τ (λ) tends to increase in the visible range with many currently used glass-ceramic plates with increasing wavelength.
  • According to the invention, the underside of the plate 12 with a translucent support 16 coated. An alternative embodiment may instead use, for example, a film marketed under the product name "Quantum Dot Enhancement Film" (QDEF), which is also used as standard in televisions and laptops.
  • In the material of the carrier 16 distributed is a variety of quantum dots 20 . 22 . 24 of different diameters. The quantum dots may consist, for example, of II-VI semiconductors such as cadmium selenide or of III-V semiconductors such as indium phosphide. The relationship between particle size and color is described in the following example using cadmium selenide quantum dots. When producing the quantum dots, there will always be a certain size distribution.
  • So has a first subset 20 the quantum dots 20 . 22 . 24 a diameter of approximately 6 nm, a second subset 22 the quantum dots 20 . 22 . 24 a diameter of only 3 nm and a third subset 24 the quantum dots an even smaller diameter. Their particular defined by material and diameter nature qualifies the first subset 20 , a first spectral color 30 , the second subset 22 , a second spectral color 32 and the third subset 24 , a third spectral color 34 to create. In the concrete exemplary embodiment, the first spectral color is concerned 30 around the color red, with the second spectral color 32 around the color green and the third spectral color 34 to the color blue.
  • To excite the quantum dots 20 . 22 . 24 by means of electromagnetic radiation 18 one serves below the carrier 16 arranged radiation source 14 , This may be, for example, a light emitting diode. The of the quantum dots 20 . 22 . 24 required excitation energy is transmitted in the present case by means of a substantially monochromatic light in the ultraviolet range, which offer the skilled person deviating methods for exciting the quantum dots, without having to leave the scope of the invention.
  • Given the transmission characteristic of the plate 12 is the relative concentration of the subsets 20 . 22 . 24 inside the vehicle 16 so chosen that the first subset 20 a comparatively small number, the second subset 22 a larger number and the third subset 24 the largest number of quantum dots 20 . 22 . 24 includes. This causes that of the quantum dots 20 . 22 . 24 each generated spectral colors red, green and blue in a ratio complement, which according to the imaging by the relative size of the arrows 30 . 32 . 34 is hinted at. The resulting polychromatic light thus has a high blue, medium green and low red content in its (first) spectral distribution.
  • With this characteristic first spectral distribution 30 . 32 . 34 the light penetrates from the carrier 16 in the adjacent plate 12 one. However, their material absorbs the described components of the light in a wavelength-dependent manner. This causes the light from the top of the plate 12 with a second spectral distribution 40 . 42 . 44 exit and the user's retina hits. This second spectral distribution 40 . 42 . 44 is perceived by the viewer as approximately white.
  • In an alternative embodiment, not shown separately in the drawing, the light-emitting diode is 14 such a way that the light 18 even the third spectral color 34 - here: the color blue - has. This approach allows for the third subset 24 the quantum dots 20 . 22 . 24 in the carrier 12 to abstain, because of the light emitting diode 14 emitted third spectral color 34 the carrier 12 penetrate and entrance into the second spectral distribution 40 . 42 . 44 Can be found. It is understood that the first subset 20 and the second subset 22 the quantum dots 20 . 22 . 24 in this case have to be such that they are irradiated by the third spectral color 34 can be stimulated.
  • The invention is not limited to the use of two or three particle sizes. According to the principles described above, it is possible for a person skilled in the art, by suitable selection of particle sizes, to adapt the first spectral distribution and consequently also the second spectral distribution so that the light passing through the glass ceramic has the desired properties, such as color temperature. In this case, for example, a higher number of particle sizes can be used.
  • In addition to the number of particle sizes, the expert will also take into account the breadth of the particle size distribution for the tuning of the desired color spectrum. For example, white luminescence conversion LEDs often operate with an intensity distribution having a relatively sharp peak in the frequency of the LED chip and a relatively broad peak in the frequencies of the luminescent dye. Such a broad spectral distribution can also be achieved by a broad size distribution of the quantum dots.
  • As an alternative to using quantum dots with a broad size distribution, suitable fluorescent materials can also be applied to the glass-ceramic plate. These fluorophores are excited by the light of the underlying light source with blue or ultraviolet light and emit light in a fabric-specific frequency band. The choice of fluorophores must be made by those skilled in the art that the resulting polychromatic light in its (first) spectral distribution has a relatively high intensity at frequencies with a low transmission through the glass ceramic plate. This can be done in typical glass ceramic panels e.g. be achieved by a high blue, medium green and low red content.
  • Due to the wavelength-dependent absorption in the glass ceramic plate, the light emerges from the top of the plate 12 with a second spectral distribution. This second spectral distribution is perceived by the viewer as approximately white.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 202011052226 U1 [0006]
    • WO 2011089327 A1 [0006]

Claims (14)

  1. Display ( 10 ) for a glass-ceramic plate ( 12 ) having a wavelength-dependent transmission characteristic, characterized by a light-transmitting device ( 16 ) for producing a polychromatic light having a first spectral distribution ( 30 . 32 . 34 ), which absorbs photons with a high energy / small wavelength and emits photons with a low energy / large wavelength, such that the light as a function of the transmission characteristic has a predetermined second spectral distribution ( 40 . 42 . 44 ), if it is the plate ( 12 ).
  2. Display ( 10 ) according to claim 1, characterized in that the translucent device ( 16 ) for generating a polychromatic light from a layer of fluorescent material.
  3. Display ( 10 ) according to claim 1, characterized in that the translucent device ( 16 ) for generating a polychromatic light from a carrier having a plurality of quantum dots ( 20 . 22 . 24 ) consists
  4. Display ( 10 ) according to claim 3, characterized by a translucent carrier ( 16 ) with a plurality of quantum dots ( 20 . 22 . 24 ) for producing a polychromatic light having a first spectral distribution ( 30 . 32 . 34 ), such that the light as a function of the transmission characteristic has a predetermined second spectral distribution ( 40 . 42 . 44 ), if it is the plate ( 12 ).)
  5. Display according to claim 4, characterized by a radiation source ( 14 ) for exciting the quantum dots ( 20 . 22 . 24 ) by means of electromagnetic radiation ( 18 ).
  6. Display according to claim 5, characterized by the following features: - the radiation source ( 14 ) is a light emitting diode and - the radiation ( 18 ) is a monochromatic light.
  7. Display according to claim 6, characterized by the following features: - at least a first subset ( 20 ) of the quantum dots is such that it has a broad color spectrum ( 30 ), - the light emitting diode ( 14 ) is such that the light ( 18 ) at least one second spectral color ( 34 ) of the spectral distribution ( 30 . 34 ) having.
  8. Display according to claim 6, characterized by the following features: a first subset ( 20 ) of the quantum dots ( 20 . 22 . 24 ) is such that it has a first spectral color ( 30 ) of the spectral distribution ( 30 . 32 . 34 ), - at least a second subset ( 22 ) of the quantum dots ( 20 . 22 . 24 ) is such that it has a second spectral color ( 32 ) of the spectral distribution ( 30 . 32 . 34 ) and - the light emitting diode ( 14 ) is such that the light ( 18 ) a third spectral color ( 34 ) of the spectral distribution ( 30 . 32 . 34 ) having.
  9. Display according to claim 6, characterized by the following features: - the light-emitting diode ( 14 ) is such that the light ( 18 ) is ultraviolet, - a first subset ( 20 ) of the quantum dots ( 20 . 22 . 24 ) is such that it has a first spectral color ( 30 ) of the spectral distribution ( 30 . 32 . 34 ), - a second subset ( 22 ) of the quantum dots ( 20 . 22 . 24 ) is such that it has a second spectral color ( 32 ) of the spectral distribution ( 30 . 32 . 34 ) and - an at least third subset ( 24 ) of the quantum dots ( 20 . 22 . 24 ) is such that it has a third spectral color ( 34 ) of the spectral distribution ( 30 . 32 . 34 ) generated.
  10. Display according to claim 8 or 9, characterized by the following features: - the first spectral color ( 30 ) is red, - the second spectral color ( 32 ) is green, - the third spectral color ( 34 ) is blue and - the second spectral distribution ( 40 . 42 . 44 ) corresponds to white.
  11. Display according to claim 10, characterized by the following features: the quantum dots ( 20 . 22 . 24 ) contain cadmium selenide, - the first subset ( 20 ) of the quantum dots ( 20 . 22 . 24 ) has a diameter of approximately 6 nanometers and - the second subset ( 22 ) of the quantum dots ( 20 . 22 . 24 ) has a diameter of approximately 3 nanometers.
  12. Display according to one of Claims 3 to 11, characterized in that the support ( 16 ) is a foil.
  13. Hob ( 10 . 12 ), characterized by the following features: - a glass-ceramic plate ( 12 ) with a wavelength-dependent transmission characteristic and - one under the plate ( 12 ) display ( 10 ) according to one of claims 1 to 12.
  14. Hob according to claim 13, characterized in that the carrier ( 16 ) a bottom side coating of the plate ( 12 ).
DE102015104304.1A 2015-03-23 2015-03-23 Display for a glass-ceramic plate Pending DE102015104304A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102015104304.1A DE102015104304A1 (en) 2015-03-23 2015-03-23 Display for a glass-ceramic plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015104304.1A DE102015104304A1 (en) 2015-03-23 2015-03-23 Display for a glass-ceramic plate

Publications (1)

Publication Number Publication Date
DE102015104304A1 true DE102015104304A1 (en) 2016-09-29

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DE102015104304.1A Pending DE102015104304A1 (en) 2015-03-23 2015-03-23 Display for a glass-ceramic plate

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10351081A1 (en) * 2003-10-31 2005-06-09 Lite-On Technology Co. White light-emitting device, has two phosphors emitting respective yellow and red lights with preset wavelengths upon excitation by blue or blue-green LED, where yellow and red lights are mixed to white light
DE102004015570A1 (en) * 2004-03-30 2005-11-10 J.S. Technology Co., Ltd. White light emitting diode arrangement, e.g. for liquid crystal display (LCD) module, combines known combinations of color light emitting diodes (LEDs) and luminescent materials, each emitting white light
DE102004033715A1 (en) * 2004-07-13 2006-02-16 Schott Ag Tile for e.g. kitchen oven glass or ceramic surface incorporates heat activated luminescent agent
DE102004040759A1 (en) * 2004-08-21 2006-03-02 Schott Ag Glass or glass/ceramic plate material, for domestic appliances, has luminescent functional displays for visibility even when not in use
WO2008128900A2 (en) * 2007-04-19 2008-10-30 BSH Bosch und Siemens Hausgeräte GmbH Domestic appliance comprising a panel of a material that is at least partially transparent
WO2011089327A1 (en) 2010-01-21 2011-07-28 Eurokera S.N.C. Display unit including a plate made of glass-ceramic
DE202011052226U1 (en) 2010-12-08 2012-01-16 Schott Ag Display device, in particular for cooking surfaces
DE102011085112A1 (en) * 2011-10-24 2013-04-25 E.G.O. Elektro-Gerätebau GmbH Cooking device with optical temperature display

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10351081A1 (en) * 2003-10-31 2005-06-09 Lite-On Technology Co. White light-emitting device, has two phosphors emitting respective yellow and red lights with preset wavelengths upon excitation by blue or blue-green LED, where yellow and red lights are mixed to white light
DE102004015570A1 (en) * 2004-03-30 2005-11-10 J.S. Technology Co., Ltd. White light emitting diode arrangement, e.g. for liquid crystal display (LCD) module, combines known combinations of color light emitting diodes (LEDs) and luminescent materials, each emitting white light
DE102004033715A1 (en) * 2004-07-13 2006-02-16 Schott Ag Tile for e.g. kitchen oven glass or ceramic surface incorporates heat activated luminescent agent
DE102004040759A1 (en) * 2004-08-21 2006-03-02 Schott Ag Glass or glass/ceramic plate material, for domestic appliances, has luminescent functional displays for visibility even when not in use
WO2008128900A2 (en) * 2007-04-19 2008-10-30 BSH Bosch und Siemens Hausgeräte GmbH Domestic appliance comprising a panel of a material that is at least partially transparent
WO2011089327A1 (en) 2010-01-21 2011-07-28 Eurokera S.N.C. Display unit including a plate made of glass-ceramic
DE202011052226U1 (en) 2010-12-08 2012-01-16 Schott Ag Display device, in particular for cooking surfaces
DE102011085112A1 (en) * 2011-10-24 2013-04-25 E.G.O. Elektro-Gerätebau GmbH Cooking device with optical temperature display

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