USRE48575EActiveUtility
Display device, in particular for cooktops
Est. expiryDec 8, 2030(~4.4 yrs left)· nominal 20-yr term from priority
G09F 9/33F24C 7/083G02B 5/20G02B 27/026H05B 6/1218G02B 5/226G09F 23/0058H05B 3/746F24C 15/10F24C 15/102F24C 7/082H05B 33/00G09G 3/36
57
PatentIndex Score
0
Cited by
28
References
19
Claims
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.
Claims
exact text as granted — not AI-modifiedThe 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 entire spectral range of 400 to 750 700 nm and less than an average of 4% in the entire 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 display side formed by the glass ceramic front side, which is determined by the following coordinates:
W2
x
y
0.3068
0.3113
0.3028
0.3304
0.3205
0.3481
0.3207
0.3462
0.3376
0.3616
0.3551
0.376
0.3548
0.3736
0.3736
0.3874
0.4006
0.4044
0.3996
0.4015
0.4299
0.4165
0.4562
0.426
0.4813
0.4319
0.4593
0.3944
0.4147
0.3814
0.3889
0.369
0.3898
0.3716
0.367
0.3578
0.3512
0.3465
0.3515
0.3487
0.3366
0.3369
0.3222
0.3243
0.3221
0.3261.
10. The display device according to claim 1 , wherein the white lamp is a white LED or a fluorescent tube.
11. The display device according to claim 1 , wherein the white lamp emits white light and the compensation filter is designed so that colored light with a color saturation between 0.99 and 0.5 is emitted on the glass ceramic front side.
12. The display device according to claim 1 , wherein the compensation filter has a brightness value of greater than 10 for transmitting standard light E in the CIExyY system (1931, 2° observer).
13. The display device according to claim 12 , wherein the brightness value is greater than 40.
14. The display device according to claim 1 , wherein the compensation filter is a color filter film.
15. The display device according to claim 14 , wherein the color filter film has a thermal stability in the range of greater than or equal to 80° C.
16. The display device according to claim 14 , wherein the color filter film has a thermal stability in the range of greater than or equal to 150° C.
17. The display device according to claim 14 , wherein the color filter film has a mask.
18. The display device according to claim 1 , wherein the compensation filter is printed on the glass ceramic panel.
19. The display device according to claim 1 , wherein the glass ceramic panel has a thickness in the range between 3 and 6 mm.Cited by (0)
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