LCD display with failure control
First Claim
Patent Images
1. A system for the display of symbols which enables a visual recognition of defective segments, the system comprising:
- a liquid crystal display having;
a transparent first plate, the first plate having transparent at least one conductive segments in a display area to represent symbols and at least one conductive inverse segment which fills out the area surrounding at least one conductive segments; and
a second plate facing the first plate, wherein the second plate is conductive in regions that are opposite the at least one conductive segments in the first plate;
a liquid crystalline substance located in the space between the first and second plate; and
an actuation device for the selective activation of the at least one conductive segments and of the at least one inverse segment, wherein the activation system for a time interval, allows simultaneous activation of the at least one conductive segments and of the at least one inverse segment, such that during the time interval it is possible to recognize failure of any portion of at least one conductive segments by their inverse appearance relative to the at least one inverse segment.
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Abstract
Liquid crystal display with conductive segments for representing symbols which also has at least one inverse segment that fills at least in part the display area that is not covered by the remaining segments. This liquid crystal display allows a simple, visual detection of faulty segments. For this purpose a check is carried out in which all segments and all existing inverse segments are activated which results in a homogenous image when the display is completely functional or the faulty segments are inversely displayed in relation to the remaining display surfaces.
24 Citations
12 Claims
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1. A system for the display of symbols which enables a visual recognition of defective segments, the system comprising:
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a liquid crystal display having; a transparent first plate, the first plate having transparent at least one conductive segments in a display area to represent symbols and at least one conductive inverse segment which fills out the area surrounding at least one conductive segments; and a second plate facing the first plate, wherein the second plate is conductive in regions that are opposite the at least one conductive segments in the first plate; a liquid crystalline substance located in the space between the first and second plate; and an actuation device for the selective activation of the at least one conductive segments and of the at least one inverse segment, wherein the activation system for a time interval, allows simultaneous activation of the at least one conductive segments and of the at least one inverse segment, such that during the time interval it is possible to recognize failure of any portion of at least one conductive segments by their inverse appearance relative to the at least one inverse segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for operating a liquid crystal display which enables visual recognition of defective segments, using a liquid crystal display having a first and a second plate which face one another and a liquid crystalline substance located in the space between the first and second plate, the first plate being transparent and having essentially transparent conductive segments in a display area to represent symbols and the second plate being conductive at least in the regions that are opposite to the conductive segments of the first plate, and the first plate has at least one conductive inverse segment which fills out the area surrounding at least one of the conductive segments, the method comprising:
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a) simultaneously activating all conductive segments of the first plate and of the at least one inverse segment for a first time interval to enable an observer to detect failed conductive segments by their inverse appearance relative to the at least one inverse segment; and b) displaying symbols by activating the conductive segments to be displayed, and the conductive segments that are not to be displayed and the at least one inverse segment remain inactivated. - View Dependent Claims (10, 11, 12)
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Specification