Liquid crystal display with heater
First Claim
1. A display device, in particular for a vehicle, comprising a screen which has a liquid crystal cell, with the liquid crystal cell having a front and a rear cell wall and a liquid crystal substance arranged in a cell space between said cell walls, and a heating apparatus by which the display device can be heated, wherein the heating apparatus (11;
-
20;
28) is arranged in the cell space of the liquid crystal cell (1;
12, 13;
42) directly or indirectly on a front (2;
17;
39) and/or on a rear (3;
13;
40) cell wall, and wherein the heating apparatus (11;
20;
28) is operated with an AC voltage; and
wherein the AC voltage which operates the heating apparatus (11;
20;
28) has a DC voltage component of no more than 100 mV.
3 Assignments
0 Petitions
Accused Products
Abstract
A display device, in particular for a vehicle, having a screen which has a liquid crystal cell, with the liquid crystal cell having a front and a rear cell wall and a liquid crystal substance arranged in the cell space between these cell walls, and having a heating apparatus by which the display device can be heated. In order to ensure reliable operation of the display device even at low temperatures, the heating apparatus is arranged in the cell space of the liquid crystal cell directly or indirectly on the front and/or, on the rear cell wall, and that the heating apparatus is operated with a pure AC voltage.
14 Citations
29 Claims
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1. A display device, in particular for a vehicle, comprising a screen which has a liquid crystal cell, with the liquid crystal cell having a front and a rear cell wall and a liquid crystal substance arranged in a cell space between said cell walls, and a heating apparatus by which the display device can be heated, wherein the heating apparatus (11;
-
20;
28) is arranged in the cell space of the liquid crystal cell (1;
12, 13;
42) directly or indirectly on a front (2;
17;
39) and/or on a rear (3;
13;
40) cell wall, and wherein the heating apparatus (11;
20;
28) is operated with an AC voltage; and
wherein the AC voltage which operates the heating apparatus (11;
20;
28) has a DC voltage component of no more than 100 mV. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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20;
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26. A display device, in particular for a vehicle, comprising a screen which has a liquid crystal cell, with the liquid crystal cell having a front and a rear cell wall and a liquid crystal substance arranged in a cell space between said cell walls, and a heating apparatus by which the display device can be heated, wherein the heating apparatus (11;
-
20;
28) is arranged in the cell space of the liquid crystal cell (1;
12, 13;
42) directly or indirectly on a front (2;
17;
39) and/or on a rear (3;
18;
40) cell wall, and wherein the heating apparatus (11;
20;
28) is operated with an AC voltage;
wherein the heating device (11;
20;
28) has an electrically conducting layer (9;
19), and the display device further comprises an electrode (front electrode 31), in whose plane the electrically conductive layer (9) is arranged in the form of strips; and
wherein elongated sections (35) of the electrically conductive layer (9) are arranged in spaces (33) between the strips (34); and
further comprising plated-through contacts (36), which connect the plane of the front electrode (31) and the plane of the rear electrode (32), to electrically connect said elongated sections (35) of the electrically conductive layer (9) to one another by connecting sections (37).
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20;
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27. A display device, in particular for a vehicle, comprising a screen which has a liquid crystal cell, with the liquid crystal cell having a front and a rear cell wall and a liquid crystal substance arranged in a cell space between said cell walls, and a heating apparatus by which the display device can be heated, wherein the heating apparatus (11;
-
20;
28) is arranged in the cell space of the liquid crystal cell (1;
12, 13;
42) directly or indirectly on a front (2;
17;
39) and/or on a rear (3;
18;
40) cell wall, and wherein the heating apparatus (11;
20;
28) is operated with an AC voltage; and
wherein said screen has a DSTN cell with an active liquid crystal cell (12) and with a passive liquid crystal cell (13;
42), with the heating apparatus (20) being arranged in the passive liquid crystal cell (13;
42). - View Dependent Claims (28)
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20;
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29. A display device, in particular for a vehicle, comprising a screen which has a liquid crystal cell, with the liquid crystal cell having a front and a rear cell wall and a liquid crystal substance arranged in a cell space between said cell walls, and a heating apparatus by which the display device can be heated, wherein the heating apparatus (11;
-
20;
28) is arranged in the cell space of the liquid crystal cell (1;
12, 13;
42) directly or indirectly on a front (2;
17;
39) and/or on a rear (3;
18;
40) cell wall, and wherein the heating apparatus (11;
20;
28) is operated with an AC voltage;
wherein the heating device (11;
20;
28) has an electrically conductive layer (9;
19), wherein the electrically conductive layer (9;
90) has a meandering profile;
the display device further comprises an electrode (front electrode 31) in whose plane the electrically conductive layer (9) is arranged is in the form of strips, and wherein elongated sections (35) of the electrically conductive layer (9) are arranged in spaces (33) between the strips (34), and further comprising plated-through contacts (36), which connect the plane of the front electrode (31) and the plane of the rear electrode (32), and electrically connect said elongated sections (35) of the electrically conductive layer (9) to one another by connecting sections (37).
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20;
Specification