Display device, in particular for cooktops

Patent metadata

Field	Value
Publication number	US-9483983-B2
Application number	US-201113993033-A
Country	US
Kind code	B2
Filing date	Dec 2, 2011
Priority date	Dec 8, 2010
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A display device in particular for cooktops is provide that has a glass ceramic with a front side and a back side and a lamp arranged in the area of the back side. The display device further includes an optical compensation filter arranged between the front side and the lamp so as to implement any color impressions easily and inexpensively and in a preselectable manner.

First claim

The invention claimed is:

1. A display device for cooktops, comprising:
a colored glass ceramic panel forming a glass ceramic front side and a glass ceramic back side, the glass ceramic panel having a mean transmission greater than 0.2% for each of the spectral ranges of 420-500 nm, 500-620 nm, and 550-640 nm, and the glass ceramic panel having a maximum transmission less than 40% in the spectral range of 400 to 750 nm and less than an average of 4% in the spectral range of 450 to 600 nm;
a lamp arranged in an area of the glass ceramic back side, the lamp being either a combination of at least a blue LED, a green LED, and red LED or being a white lamp; and
an optical compensation filter arranged between the glass ceramic front side and the lamp with the glass ceramic panel and the compensation filter forming two filters arranged one after another such that a shift in a standard chromaticity coordinate x, y in the CIE Norm Valent System CIExyY (CIE: Commision Internationale de l'Eclaireage, 1931, 2° observer) of the lamp due to filter properties of the glass ceramic panel is corrected by a combination of the glass ceramic panel and the compensation filter to yield a desired chromaticity coordinate x, y in the CIE Norm Valent System CIExyY (CIE: Commision Internationale de l'Eclaireage, 1931, 2° observer).

2. The display device according to claim 1 , wherein the mean transmission is greater than 0.4% for each of the spectral ranges of 420-500 nm, 500-620 nm, and 550-640 nm.

3. The display device according to claim 1 , wherein the maximum transmission is less than 25% in the spectral range of 400 to 750 nm.

4. The display device according to claim 1 , wherein the glass ceramic panel causes the standardized chromaticity coordinate of the lamp to appear on or above the limit curve (G 1 ) which is determined by the following coordinates in transmission through the same glass ceramic body in the CIE Norm Valent System CIExyY:

Limit curve G1

x
Y

0.71
0.27

0.17
0.02

0.12
0.08

0.05
0.30

0.01
0.60

0.08
0.81

0.28
0.70

0.71
0.27.

5. The display device according to claim 4 , wherein the glass ceramic panel causes the standardized chromaticity coordinate of the lamp to appear on or above the limit curve (G 2 ) which is determined by the following coordinates in transmission through same glass ceramic body in the CIE Norm Valent System CIExyY:

Limit curve G2

x
Y

0.64
0.28

0.20
0.07

0.17
0.09

0.10
0.30

0.08
0.56

0.12
0.70

0.26
0.65

0.64
0.28.

6. The display device according to claim 1 , wherein light whose chromaticity coordinate is different from the original chromaticity coordinate of the lamp is created on the display side formed by the glass ceramic front side.

7. The display device according to claim 1 , wherein light whose chromaticity coordinate is compensated from the same original chromaticity coordinate of the lamp is created on the display side formed by the glass ceramic front side.

8. The display device according to claim 1 , wherein light whose chromaticity coordinate in the CIE Norm Valent System CIExyY is in or on the limit of the white range (W 1 ) is created on the display side formed by the glass ceramic front side, which is determined by the following coordinates:

W1

x
y

0.3
0.25

0.26
0.32

0.37
0.43

0.51
0.48

0.48
0.35

0.35
0.3.

9. The display device according to claim 8 , wherein light whose chromaticity coordinate in the CIE Norm Valent System CIExyY is in or on the limit of the white range (W 2 ) is created on the dis

Assignees

• Weiss Evelin
• Ohl Gerold
• Zenker Thomas
• Taplan Martin
• Schott Ag

Inventors

• Weiss Evelin
• Ohl Gerold
• Zenker Thomas
• Taplan Martin

Classifications

• G09F9/33

  being semiconductor devices, e.g. diodes · CPC title

• F24C7/082

  on ranges, e.g. control panels, illumination · CPC title

• H05B6/1218

  with arrangements using lights for heating zone state indication · CPC title

• F24C15/10

  Tops, e.g. hot plates; Rings (cover lids or splash guards F24C15/12; spillage trays or grooves F24C15/14) · CPC title

• F24C7/083 Primary

  on tops, hot plates · CPC title