EP1112529B1 - Flüssigkristallanzeigesystem und Verfahren zum Betrieb einer Flüssigkristallanzeige mit visueller Ausfallskontrolle - Google Patents

Flüssigkristallanzeigesystem und Verfahren zum Betrieb einer Flüssigkristallanzeige mit visueller Ausfallskontrolle Download PDF

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Publication number
EP1112529B1
EP1112529B1 EP99968725A EP99968725A EP1112529B1 EP 1112529 B1 EP1112529 B1 EP 1112529B1 EP 99968725 A EP99968725 A EP 99968725A EP 99968725 A EP99968725 A EP 99968725A EP 1112529 B1 EP1112529 B1 EP 1112529B1
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EP
European Patent Office
Prior art keywords
segments
plate
inverse
liquid crystal
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.)
Expired - Lifetime
Application number
EP99968725A
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German (de)
English (en)
French (fr)
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EP1112529A1 (de
Inventor
Thomas Klemm
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Roche Diagnostics GmbH
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Roche Diagnostics GmbH
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Publication date
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
    • G09G3/18—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/08—Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof

Definitions

  • the present invention relates to a system for displaying Symbolon, which is a visual recognition allows faulty segments of a liquid crystal display.
  • the display shows a first and a second plate arranged opposite, located in the space between the first and second plate a liquid crystalline substance.
  • the first plate is transparent to the incident Light and has essentially transparent in a display area.
  • the second plate is at least certain Surface areas conductive.
  • at least on the first plate there is a conductive inverse segment that does not move from the segments to the Representation of symbols covered display area at least partially filled.
  • the present invention is in the field of information transfer using liquid crystal displays.
  • liquid crystal displays have been shown enforced by alphanumeric characters or symbols. such as B. clocks, calculators and the same.
  • a problem that occurs frequently in practice, however, is this. that individual segments of the liquid crystal display fail. what through faulty contacts. Conductor interruptions, defective driver circuits and the like caused can be.
  • Failed segments of an LCD display can have fatal consequences. For example, falls in the case of a conventional 7-segment representation, the central crossbar, see above 8 is represented as 0 and the user or the doctor receives incorrect information. Another critical example is the representation of a decimal point call. the absence of which leads to completely wrong results.
  • the task of the present The invention was therefore to propose a system and a method in which the Users of the failure of segments of a liquid crystal display can be easily and reliably detected.
  • a display is described in US Pat. No. 5,559,528 which has redundant segments. at This display has additional segments that are parallel to the conventional ones Segments run and if one of the segments fails, the other continues for ensure correct information transmission.
  • a display has the disadvantage that a large number of individual segments must be controlled separately, so that both the effort for the electronic control device and for that Display itself greatly increased.
  • Another disadvantage is. that with a variety of Symbols a use of redundant segments for user-confusing advertisements leads. For example, a bell, as is known from alarm clocks, is shown two such bells would have to be next to each other when using redundant segments are shown that also in the normal case, d. H. if the segments are flawless work, both are displayed. In such a case, the user is irritated be whether the double display of the alarm bell contains special information.
  • the prior art also includes a method for checking liquid crystal displays Known, in which all existing segments are activated when the display is switched on become. The viewer can now check visually. whether the 7-segment displays represent the usual shape of an eight, or whether individual segments are missing.
  • this method can only be applied to advertisements where the user knows the correct appearance of the segments, there is a The disadvantage is that a slight inattentiveness of the user is sufficient to avoid any Failed to overlook display errors.
  • a liquid crystal display is described in German Offenlegungsschrift DE 37 04 031, which has control segments that are electrical with the regular display segments are connected in series. Furthermore, supplementary segments are described that next to the control segments there is an eye-catching symbol with them to build. With this arrangement it is possible to check whether the supply of a Control system and the associated regular segment is intact the route between the control symbol and the assigned regular However, segment is not possible with this arrangement.
  • non-display electrodes These electrodes are arranged so that they cover a large part of the ad that is not used for the actual display becomes.
  • the non-display electrodes are not used to detect a failure used by segments, but serve to increase the contrast in the display area.
  • US 3,938,140 describes a segment display in which the individual segments are composed of sub-segments, so that if one of the sub-segments fails symbol to be displayed is displayed garbled and the segment failure for the user becomes recognizable. In contrast to the present invention, however, there is a failure not due to deviations from a homogeneous display when all are activated Segments recognizable, but the user must use the garbled representation recognize that a segment has failed.
  • GB 2005059 describes an arrangement in which each segment has its failure is regarded as critical, a so-called control segment is assigned, which with the respective segment is connected in series If all segments are activated, a Segment failure detected due to the lack of activation of the corresponding control segment become.
  • a disadvantage of this ad control is that it is for a user similarly, it can be difficult to recognize the lack of activation of a control segment as with conventional displays, the absence of a segment with simultaneous activation of all segments is difficult to see.
  • the arrangement has the Disadvantage that, for example, an error in the conductor track between the control segment and the assigned segment cannot be recognized.
  • the invention consists in the specification of a system for displaying symbols according to claim 1 and the method for operating a liquid crystal display according to Claim 9. Modifications are given in the dependent claims.
  • the area occupied by the inverse segment or the area occupied by the inverse segments Areas should be such that the regular segments are from the inverse segments are surrounded. With common control of regular segments and Inverse segments result in a surface that appears homogeneous to the viewer, while the failure of a segment makes it appear inverse to the viewer.
  • the present invention discloses a liquid crystal display which enables visual recognition faulty segments is possible in a simple and safe manner.
  • the liquid crystal display next to the conventional segments for the display of alphanumeric Characters or symbols one or more segments that are not of the conventional segments covered covered display area, and the in Within the scope of the present invention are called inverse segments. So can the display of a display device according to the invention from conventional displays can be thought of by adding inverse segments.
  • the inverse segments usually become displays in the same manufacturing step how the regular segments are applied or exposed (e.g. in etching processes).
  • the present invention includes systems with a control device for the Liquid crystal display with the control methods described elsewhere the display and display of characters can be implemented.
  • the systems can also have a switch or the like with which the control the display can be initiated so that it is possible for the user to take control the display at a time chosen by him.
  • a liquid crystal display in the system according to the invention has a first and a second plate which are arranged opposite each other, and in the space between them is a liquid crystalline Substance. At least one of the two panels is transparent so that the user through this plate a change in the optical properties of the liquid crystalline Can perceive substance.
  • the basic structure of liquid crystal displays is in State of the art known, so that in this application only for those related with the details essential to the invention, a more detailed description is given. A detailed compilation of suitable liquid crystalline substances and the structure and the functioning of liquid crystal displays can be found in Ullmann's encyclopedia of technical chemistry under the keyword "liquid crystals".
  • the present invention is applicable to both liquid crystal display systems operating in transmission work in reflection as well. Accordingly, one of the plates mentioned transparent and the other plate can be either transparent or reflective his. Furthermore, the invention is not restricted to a special display system, but can generally be used for systems in which an optically perceptible Change in the liquid crystalline substance caused by an electric field becomes.
  • the principle of dynamic scattering the principle of the deformation of aligned phases and display systems described according to the so-called Schadt-Helfrich effect.
  • the latter principle is applicable in a variety of cases and is characterized by its long operating times and low power consumption.
  • the liquid-crystalline is Substance between crossed polarizers and the layer thickness of the liquid crystalline Substance is chosen so that the light experiences a phase rotation of 90 °. Without one Controlling the display, such a display therefore appears transparent.
  • the liquid-crystalline phase becomes an electrical voltage of approx. I to 5 volts reoriented and the ad appears in the areas where the reorientation takes place as opaque.
  • An electric field is generally used to control liquid crystal displays.
  • transparent conductive layers on the plates between which the liquid crystalline substance is applied.
  • the conductive layer attached in front of the reflective layer may be opaque and be reflective.
  • Transparent conductive layers can be vapor deposited or sputtering on tin (IV) oxide layers doped with antimony or with Tin (IV) oxide-doped indium (III) oxide layers are produced.
  • the leading layers are the Formed into segments.
  • the term "segments" is used in the context of the present Invention for the individual segments of conventional segment displays as well for symbols such as alarm bells, arrows, stylized thermometers and the like, used.
  • the segments are via leads with contacts in the edge area connected to the plate on which the segments are located.
  • the electrical leads are also made from transparent conductive layers. Will the conductive layer on the opposite plate, the electrical ones appear Supply lines when driving the respective segments also on the display. This is however undesirable, so that the counter electrode on the second plate is usually carried out in this way will that only between the segments to be displayed and the counter electrode a substantial electric field is built up, but not between the supply lines and the counter electrode.
  • FIG. 1A is a liquid crystal display of the prior art.
  • the electrodes are shown on a plate of a liquid crystal display are applied. Both are in the figure Segments (1), their supply lines (2) and the contacts (3) are shown.
  • Figure 1B is one Counter electrode shown, which is arranged so that the conductor tracks can be recognized as eight to lie in the display opposite the corresponding figure eight of Figure 1A come. Since there are no counter electrodes in the area of the leads and contacts, they do not appear in the liquid crystal display even when they are at a potential opposite the counter electrode.
  • the Counter electrode can also be constructed from individually controllable segments. This can be achieved that an electric field on the desired area of the display can be limited. For multiplex displays, a counter electrode with a higher number of leads is required, but this can be done for the actual electrode Supply lines are saved, so that there is a lower total number of supply lines results.
  • Figure 2 shows the segments applied to one of the plates of the liquid crystal display are.
  • the inverse segments fill the Display area in the area in which there are no regular segments or feed lines available. Between the inverse segments and the regular segments and their There must be no electrical contact with the supply lines, so that the inverse segments are independent can be controlled by the other segments, therefore the inverse segments fill the display area is not completely, but there are gaps, which one Prevent electrical short circuit.
  • the distance between the segments or between the segments and the inverse segments are in the range of approximately 50-100 ⁇ m. It is also possible to provide the inverse segment (s) only in part of the display area.
  • FIG. 3 shows a segment arrangement according to the invention for representing a zero shown.
  • an inverse segment that is in the essentially includes the interior and the surrounding area of zero.
  • the counter electrode can be made of one conductive surface consist essentially of the same size.
  • the segments are advantageous and inverse segments of the counterelectrode are essentially congruent with which Exception that the respective supply lines to the segments in different areas lie, so that the leads when activating segments in the display are not become visible.
  • a functional check of the liquid crystal display can be carried out according to the following procedure expire:
  • the display device is designed so that it appears uniformly bright without activation.
  • a Schadt-Helfrich display is preferred used with crossed polarizers.
  • the liquid crystalline Substance chosen so that it has an optical rotation of 90 ° without applied voltage or causes 270 °.
  • both the segments and the inverse segments are activated, so that the display appears dark to the viewer. If everything works Segments, the display is homogeneously dark. However, one of the segments should fail there is no potential difference between this segment and the counter electrode and the area of the segment appears as bright. It is due to the inverse segments it is possible for the viewer to recognize the shape of the failed segment, because a bright space remains on the otherwise dark display.
  • the functional segments and inverse segments form a framework, so to speak where a failed segment is highlighted inversely.
  • a device with such a Display can be used to check the display accordingly when switching on or at Operation by the user, as mentioned above, actuation of all segments and perform inverse segments for a few seconds to give the viewer the opportunity to identify faulty segments.
  • the segments can the display is controlled as for commercial advertisements, d. H. a control of the inverse segments is only necessary if the display is checked again to be carried out.
  • a display has the advantage that the electronic Circuits and control algorithms only marginally compared to conventional displays need to be changed - it is only the joint control of the segments and inverse segments necessary to carry out the control.
  • the reverse procedure is also possible; H. it becomes an ad designed in such a way that when switched off, the observer sees it as homogeneously dark appears. This can be achieved with a Schadt-Helfrich ad, for example which the polarizers are aligned in the same direction.
  • the display is initially a control of all segments and inverse segments performed. If there are now defective segments, these are raised dark from the otherwise bright display.
  • the actual display to be displayed Information can now be provided in two ways:
  • the segments to be displayed are controlled so that they appear bright compared to the otherwise dark display.
  • the controlled segments form translucent areas.
  • Backlight the display device provided, the selected segments appear to the viewer to be luminous.
  • This operating mode can be used advantageously for displays that are read in the dark be such. B. speedometers, car radios, clinical thermometers etc.
  • the display is activated inversely to the usual one Control, d. H. all segments that should not be shown, as well as the inverse segments, are activated while the segments to be displayed are not activated and will remain dark accordingly.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP99968725A 1998-09-08 1999-09-04 Flüssigkristallanzeigesystem und Verfahren zum Betrieb einer Flüssigkristallanzeige mit visueller Ausfallskontrolle Expired - Lifetime EP1112529B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19840952 1998-09-08
DE19840952A DE19840952C1 (de) 1998-09-08 1998-09-08 LC-Display mit Ausfallkontrolle
PCT/EP1999/006523 WO2000014599A1 (de) 1998-09-08 1999-09-04 Lcd-display mit ausfallkontrolle

Publications (2)

Publication Number Publication Date
EP1112529A1 EP1112529A1 (de) 2001-07-04
EP1112529B1 true EP1112529B1 (de) 2002-05-08

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EP99968725A Expired - Lifetime EP1112529B1 (de) 1998-09-08 1999-09-04 Flüssigkristallanzeigesystem und Verfahren zum Betrieb einer Flüssigkristallanzeige mit visueller Ausfallskontrolle

Country Status (7)

Country Link
US (1) US6927749B1 (https=)
EP (1) EP1112529B1 (https=)
JP (2) JP4808314B2 (https=)
AT (1) ATE217423T1 (https=)
DE (2) DE19840952C1 (https=)
ES (1) ES2177348T3 (https=)
WO (1) WO2000014599A1 (https=)

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DE10040505A1 (de) * 2000-08-18 2002-04-04 Bosch Gmbh Robert Gassensor, insbesondere Lambada-Sonde
US7727181B2 (en) 2002-10-09 2010-06-01 Abbott Diabetes Care Inc. Fluid delivery device with autocalibration
US7679407B2 (en) 2003-04-28 2010-03-16 Abbott Diabetes Care Inc. Method and apparatus for providing peak detection circuitry for data communication systems
US20070135697A1 (en) * 2004-04-19 2007-06-14 Therasense, Inc. Method and apparatus for providing sensor guard for data monitoring and detection systems
CN101180093B (zh) 2005-03-21 2012-07-18 雅培糖尿病护理公司 用于提供结合的药剂输液以及分析物监测系统的方法和系统
US7768408B2 (en) 2005-05-17 2010-08-03 Abbott Diabetes Care Inc. Method and system for providing data management in data monitoring system
US7583190B2 (en) 2005-10-31 2009-09-01 Abbott Diabetes Care Inc. Method and apparatus for providing data communication in data monitoring and management systems
US8344966B2 (en) * 2006-01-31 2013-01-01 Abbott Diabetes Care Inc. Method and system for providing a fault tolerant display unit in an electronic device
US8579853B2 (en) 2006-10-31 2013-11-12 Abbott Diabetes Care Inc. Infusion devices and methods
US20110109602A1 (en) * 2008-07-16 2011-05-12 Freescale Semiconductor, Inc. Fault detection apparatus for alphanumeric display system and method of detecting a fault
US8467972B2 (en) 2009-04-28 2013-06-18 Abbott Diabetes Care Inc. Closed loop blood glucose control algorithm analysis
KR101736651B1 (ko) 2013-03-15 2017-05-16 에프. 호프만-라 로슈 아게 전기화학적 분석물질 측정에서 회복 펄스로부터 정보를 이용하는 방법들 뿐만 아니라 이를 통합한 기기들, 장치들 및 시스템들
EP2972269B1 (en) 2013-03-15 2018-07-11 Roche Diabetes Care GmbH Methods of detecting high antioxidant levels during electrochemical measurements and failsafing an analyte concentration therefrom
WO2014140172A1 (en) 2013-03-15 2014-09-18 Roche Diagnostics Gmbh Methods of failsafing electrochemical measurements of an analyte as well as devices, apparatuses and systems incorporating the same
EP3388823B1 (en) 2013-03-15 2024-07-10 Roche Diabetes Care GmbH Method of scaling data used to construct biosensor algorithms
CA3035874C (en) 2016-10-05 2025-09-09 F. Hoffmann-La Roche Ag DETECTION REAGENTS AND ELECTRODE ARRANGEMENTS FOR MULTI-ANALYTICAL DIAGNOSTIC TEST ELEMENTS, AS WELL AS THEIR METHODS OF USE
CN110383064B (zh) 2016-10-24 2021-06-29 豪夫迈·罗氏有限公司 校正生物传感器的导电元件中的无补偿电阻的方法以及装置和系统

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Also Published As

Publication number Publication date
EP1112529A1 (de) 2001-07-04
JP2010286839A (ja) 2010-12-24
WO2000014599A1 (de) 2000-03-16
ATE217423T1 (de) 2002-05-15
US6927749B1 (en) 2005-08-09
ES2177348T3 (es) 2002-12-01
DE59901417D1 (de) 2002-06-13
JP2002524773A (ja) 2002-08-06
DE19840952C1 (de) 2000-03-23
JP4967047B2 (ja) 2012-07-04
JP4808314B2 (ja) 2011-11-02

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