EP2126886A1 - Procédé et dispositif d'affichage pour représenter des informations au moyen d'un dispositif d'affichage et dispositif d'affichage correspondant - Google Patents

Procédé et dispositif d'affichage pour représenter des informations au moyen d'un dispositif d'affichage et dispositif d'affichage correspondant

Info

Publication number
EP2126886A1
EP2126886A1 EP08708158A EP08708158A EP2126886A1 EP 2126886 A1 EP2126886 A1 EP 2126886A1 EP 08708158 A EP08708158 A EP 08708158A EP 08708158 A EP08708158 A EP 08708158A EP 2126886 A1 EP2126886 A1 EP 2126886A1
Authority
EP
European Patent Office
Prior art keywords
temperature
liquid crystal
crystal cell
duration
display device
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.)
Granted
Application number
EP08708158A
Other languages
German (de)
English (en)
Other versions
EP2126886B1 (fr
Inventor
Jürgen LITTWIN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2126886A1 publication Critical patent/EP2126886A1/fr
Application granted granted Critical
Publication of EP2126886B1 publication Critical patent/EP2126886B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/22—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of characters or indicia using display control signals derived from coded signals representing the characters or indicia, e.g. with a character-code memory
    • G09G5/30—Control of display attribute

Definitions

  • the invention relates to a method for displaying information, in particular in a vehicle, by means of a display having a liquid crystal cell, wherein an electrical voltage is applied to the liquid crystal cell and wherein the voltage for a flashing display of the information is periodically turned on and off, so a blinking period duration has in each case a switch-on duration of the voltage and a switch-off duration of the voltage.
  • the invention relates to a display device, in particular for a vehicle, with a signal to be acted upon by an electrical voltage and a liquid crystal cell connected to a drive unit, wherein the drive unit is designed such that by means of the drive unit, the voltage for a flashing display of the information periodically switched on and off.
  • a method of the aforesaid kind is known from US 5 646 645 A of a dot-matrix liquid crystal display system for alternately displaying a pattern in positive and negative representation, which low-temperature liquid crystal display system provides an increase in a blinking period.
  • a disadvantage of this known system that the attention of the display is reduced by increasing the Blinkperiodendauer, which means a reduction in the flashing frequency.
  • EP 1 154 304 A1 generally describes a method for controlling at least one parameter of a liquid crystal cell which determines parameters of a temperature of a liquid crystal cell. Substance is affected, known, wherein a switching time of the liquid crystal cell is determined for the control.
  • the object of the invention is to provide a method of the type mentioned above, which enables in a simple manner a high attention-getting effect of the information representation even at low temperatures. Moreover, it is an object of the invention to provide a display device of the type mentioned, which is simple in construction and with their help, even at low temperatures, a high attention-getting information display can be achieved.
  • the first object is achieved in a method of the type mentioned in the present invention, that the duty cycle during the Blinkperiodendauer is dependent on a temperature and that at a first, lower temperature, the duty cycle at a constant Blinkperiodendauer is smaller than at a second, higher temperature.
  • the inertia of a liquid crystal substance of the liquid crystal cell increases with decreasing temperature.
  • the duty cycle which is variable in the method according to the invention, at a lower temperature, with the aid of the invention, flashing of the information representation is maintained even if the inertia of the liquid crystal substance of the liquid crystal cell increases due to temperature.
  • the particular advantage of the method according to the invention consists in the fact that the blinking period and thus also the blinking frequency is kept constant at the same time as the switch-on duration is shortened. In this way, a high level of attention Effect of information presentation, which attention effect is based on a high blinking frequency and would decrease with a reduction in the blinking guaranteed.
  • the method is very advantageously suitable for the display of information in a vehicle, in particular a motor vehicle, where it contributes sustainably to an increase in traffic safety.
  • a supply of heat energy to the liquid crystal cell in order to reduce the inertia of the liquid crystal substance can be dispensed with regularly with the aid of the invention.
  • the temperature on which the duty cycle depends can be detected in a variety of ways; Preferably, the temperature is measured, for example by means of a temperature sensor.
  • a drive sequence for the flashing are temperature-dependent adjusted.
  • the proportion of duty cycle on the Blinkperiodendauer the smaller, the lower the temperature.
  • the proportion of duty cycle at the Blinkperiodendauer each be constant within temperature ranges, so that there is a stepped dependence of the duty cycle of the temperature.
  • information for example alphanumeric characters and / or pictograms, can be displayed flashing on the liquid crystal cell without the blinking effect being lost due to increased inertia of the liquid crystal substance and only for example possibly lower-contrast - sign and / or pictogram would be recognizable.
  • the liquid crystal cell may preferably be part of a liquid crystal display (LCD, Liquid Crystal Display).
  • an afterglow which could also be termed afterglow, which is amplified with increasing inertia of the liquid-crystal substance, is reliably counteracted by the information representation, so that an observer still perceives a flashing, for example, of the character and / or the icon.
  • an optimized operator guidance by means of a liquid crystal screen in a motor vehicle can be realized even at low ambient temperatures.
  • the liquid crystal cell forms a single display area over the entire surface and ignites a signal effect merely by flashing. It would also be conceivable to use the method according to the invention for a negative information representation, for example by means of a flashing negative lettering.
  • a particularly pronounced attentional effect can be achieved in that, according to an advantageous development of the invention, the information is displayed in a positive representation on the liquid crystal cell; The information is shown as a dark sign and / or dark lettering flashing on a bright background.
  • the temperature is the ambient temperature of the liquid crystal cell.
  • the ambient temperature is detected as close as possible to the liquid crystal cell, for example, measured by means of a temperature sensor.
  • the temperature is detected at regular intervals. This allows the process to react quickly to temperature fluctuations to ensure reliable flashing without requiring continuous temperature control. lent.
  • the time intervals in which a temperature detection takes place can be one minute, for example.
  • adjusting the duty cycle to the temperature can advantageously be done quickly and accurately, if according to another advantageous embodiment of the invention after detecting the temperature in each case a dependent of the detected temperature adjusting the duty cycle takes place.
  • the method according to the invention can be further simplified in particular for a temperature range in which the liquid crystal substance has a very low, preferably minimal, inertia in that, according to another advantageous development of the invention, an upper limit temperature is greater than the second temperature and that at Temperatures above the upper limit temperature, the duty cycle is constant.
  • a lower Limit temperature is lower than the first temperature and that at temperatures below the lower limit temperature, the Blinkperiodendauer is extended over a Blinkperiodendauer at temperatures above the lower limit temperature.
  • the above second object is achieved according to the invention with a display device of the aforementioned type, wherein an electrically connected to the drive unit temperature detection device is provided and wherein by means of the drive unit and in dependence on the Tempe- the turn-on duration during a Blinkperiodendauer be changed in such a way that at a first, lower temperature, the duty cycle with a constant Blinkperiodendau- er is smaller than at a second, higher temperature.
  • the display device according to the invention which is particularly suitable for carrying out a method according to the invention described above, is particularly advantageous by providing the specially designed drive unit according to the invention, by means of which drive unit, a reduction of the duty cycle at a constant Blinkperiodendauer, that is at a constant flashing frequency, at low temperature he follows.
  • An elaborate, additional heating device for the display device can therefore be dispensed with with the invention. This not only reduces the production costs of the display device, but also advantageously reduces both the demand for electrical energy for operating the display device and the weight of the display device.
  • the display device according to the invention is particularly well suited for vehicles, especially motor vehicles.
  • the temperature detection device has a temperature sensor arranged in the immediate vicinity of the liquid crystal cell.
  • a detection of a temperature characteristic of the temperature of the liquid-crystal substance in the liquid-crystal cell namely the direct ambient temperature of the liquid-crystal cell, can easily be detected.
  • the temperature sensor is arranged in or on the display device.
  • the temperature sensor directly on or in the liquid crystal cell.
  • FIG. 1 shows a display device with a liquid crystal cell
  • Figure 2 is a related to a Blinkperiodendauer
  • FIG. 3 is a flowchart of a section of a method for displaying information.
  • FIG. 1 shows a display device 1 for a vehicle (not further shown here) designed as a motor vehicle.
  • the display device 1 may be part of a tachograph for the motor vehicle. It is also conceivable, for example, for the display device 1 to be arranged in a cockpit or dashboard, for example within a combination display instrument, of the motor vehicle or in a center console of the motor vehicle.
  • the display device 1 has a liquid crystal cell 3 that can be acted on by an electrical power supply 2 to present information that may in principle be variable and / or unchangeable components. Furthermore, an electrically connected to the liquid crystal cell 3 drive unit 4 is provided, which is designed such that by means of the drive unit 4, the electrical voltage for a flashing display of the information is periodically switched on and off. In addition, an electrically connected to the drive unit 4 temperature detecting means 5 is provided.
  • the temperature detection device 5 has a temperature sensor 6, which is arranged in the immediate vicinity of the liquid crystal cell 3. In this exemplary embodiment, the temperature sensor 6 is arranged in the immediate vicinity of the liquid crystal cell 3 in such a way that the temperature sensor 6 is located inside the display device 1, namely within a housing 7 of the display device 1. It is also conceivable, for example, that the temperature sensor is arranged in or on the liquid crystal cell.
  • the duty cycle of the voltage during a blinking period is variable in such a way that at a first, lower temperature, the switch-on is smaller at a constant Blinkperiodendauer than at a second, higher temperature.
  • FIGS. 1, 2 A method for displaying information that can be carried out with the display device 1 is described in more detail below with reference to FIGS. 1, 2:
  • the duty cycle during the Blinkperiodendauer depends on the temperature, and that of the measured by the temperature sensor 6 ambient temperature of the liquid crystal cell 3.
  • the temperature dependence of the duty cycle is that at a first, lower temperature, the duty cycle with a constant Blinkperiodendauer smaller than at a second, higher temperature.
  • the temperature T in this embodiment is the ambient temperature of the liquid crystal cell 3.
  • a solid line I in the diagram according to FIG. 2 is valid, by way of example, for a blinking period duration tBP of 1 s which is constant over all temperatures. It can be seen that at a first, lower temperature Tl (in this example, about -15 0 C), the duty cycle tE is smaller than at a second, higher temperature T2 (in this example, about -5 0 C); at the first temperature Tl the duty cycle is 0.2 s, that is, the turn-off is here 0.8 s, and at the second temperature T2, the duty cycle is 0.3 s, that is, the turn-off is 0.7 s, and although in each case during a blink period tBP of Is.
  • the turn-on duration is therefore 20% and the turn-off duration 80% of the blinking period duration at the first temperature T1 tBP, and at the second temperature T2, the duty cycle is 30% and the turn-off duration 70% of the flash period tBP.
  • the switch-on duration tE is constant at temperatures above an upper limit temperature To, which upper limit temperature To is greater than the second temperature T2 and corresponds to 0 ° C in this embodiment.
  • the duty cycle is 0.5 s, which means that in this example the switch-off duration is 0.5 s.
  • a variant of the illustrated method for very low temperatures in the diagram of Figure 2 is shown by a dotted line II:
  • the Blinkperiodenderb tBP2 over a Blinkperiodendauer tBP extended above the lower limit temperature Tu.
  • the extended flash period tBP2 is for example 1.2 s
  • the turn-on duration tE can be, for example, 0.2 s, so that the above-mentioned ratio VtE is 0.17.
  • the switch-off duration tA corresponds to 1 s in this embodiment variant.
  • FIG. 3 shows a flow chart of a detail from the method first described above.
  • a temperature T in the form of the ambient temperature of the liquid crystal cell is detected, provided that a period of time has elapsed since a last detection of the ambient temperature 1 min has elapsed (decision: Has at least 1 min been passed since the last detection of the ambient temperature?).
  • a return via a first output and a renewed input into the first block A occurs (see reference n); on the other hand, if a time interval of 1 min has elapsed since the last detection of the ambient temperature, a second block B is reached via a second output (see reference symbol j), in which it is checked whether the detected temperature is above a threshold value, which in this example is 0 0 C is, is (decision: Is detected temperature greater than 0 0 C?).
  • a turn-on time of 50% and a turn-off duration of 50% are set via a first output (see reference symbol j) of this block B in a third block B1 , Thereafter, a return to the first block A takes place and the procedure starts to run from scratch.
  • a second output (see reference numeral n) of the second block B in a fourth block C a check of the temperature to see if they over a further, lower threshold, here -10 0 C is, is (Decision fertil: Is detected temperature greater -10 0 C?). If the temperature is greater than -10 0 C, then through a first output (see reference numeral j) of the fourth block C in a fifth block Cl a duty cycle of 30% and an off time of 70%, each based Lucas- the flashing period of time, provides. Thereafter, a return to the first block A takes place and the procedure starts to run from scratch.
  • a duty cycle of 20% and an off time of 70%, each based on the blink period is fed via a second output (see reference number n) of the fourth block C in a sixth block C2, a duty cycle of 20% and an off time of 70%, each based on the blink period , discontinued. After that takes place a return to the first block A and the procedure starts to run from scratch.

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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)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention concerne un procédé pour représenter des informations, en particulier dans un véhicule, au moyen d'un dispositif d'affichage (1) présentant une cellule à cristaux liquides (3), une tension électrique étant appliquée à la cellule à cristaux liquides (3), la tension étant appliquée puis retirée périodiquement pou rassurer une représentation intermittente des informations de sorte que la période de représentation par intermittence comprend respectivement un temps d'application de tension et un temps de retrait de tension. Pour permettre une représentation très fidèle des informations même à basse température, le temps d'application de tension au cours de la période de représentation par intermittence, dépend de la température, et le temps d'application de tension à une première température plus faible pour une période de représentation par intermittence identique, est inférieur à celui à une deuxième température supérieure à la première. L'invention concerne également un dispositif d'affichage (1) comprenant une cellule à cristaux liquides (3) à laquelle une tension électrique peut être appliquée pour représenter des informations, et une unité de commande (4) reliée électriquement à la cellule à cristaux liquides (3).
EP08708158A 2007-02-19 2008-01-24 Procédé et dispositif d'affichage pour représenter des informations au moyen d'un dispositif d'affichage et dispositif d'affichage correspondant Active EP2126886B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007008467A DE102007008467A1 (de) 2007-02-19 2007-02-19 Verfahren zur Darstellung einer Information mittels einer Anzeigevorrichtung und Anzeigevorrichtung
PCT/EP2008/050819 WO2008101761A1 (fr) 2007-02-19 2008-01-24 Procédé et dispositif d'affichage pour représenter des informations au moyen d'un dispositif d'affichage et dispositif d'affichage correspondant

Publications (2)

Publication Number Publication Date
EP2126886A1 true EP2126886A1 (fr) 2009-12-02
EP2126886B1 EP2126886B1 (fr) 2012-07-11

Family

ID=39402635

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08708158A Active EP2126886B1 (fr) 2007-02-19 2008-01-24 Procédé et dispositif d'affichage pour représenter des informations au moyen d'un dispositif d'affichage et dispositif d'affichage correspondant

Country Status (3)

Country Link
EP (1) EP2126886B1 (fr)
DE (1) DE102007008467A1 (fr)
WO (1) WO2008101761A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07181928A (ja) 1993-12-22 1995-07-21 Nikon Corp ドットｌｃｄ表示システム
GB2288671B (en) * 1994-04-22 1998-04-01 Delco Electronic Overseas Corp Liquid crystal display circuit and regulated power supply therefor
JP3342341B2 (ja) * 1997-03-13 2002-11-05 キヤノン株式会社 液晶装置及び液晶装置の駆動方法
US6803899B1 (en) * 1999-07-27 2004-10-12 Minolta Co., Ltd. Liquid crystal display apparatus and a temperature compensation method therefor
JP3606138B2 (ja) * 1999-11-05 2005-01-05 セイコーエプソン株式会社 ドライバｉｃ、電気光学装置及び電子機器
DE10023147A1 (de) 2000-05-12 2001-11-15 Mannesmann Vdo Ag Verfahren zum Regeln zumindest eines Parameters einer Flüssigkristallzelle und nach einem solchen Verfahren regelbare Flüssigkristallzelle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008101761A1 *

Also Published As

Publication number Publication date
EP2126886B1 (fr) 2012-07-11
WO2008101761A1 (fr) 2008-08-28
DE102007008467A1 (de) 2008-08-21

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