EP2126886B1 - 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 Download PDF

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Publication number
EP2126886B1
EP2126886B1 EP08708158A EP08708158A EP2126886B1 EP 2126886 B1 EP2126886 B1 EP 2126886B1 EP 08708158 A EP08708158 A EP 08708158A EP 08708158 A EP08708158 A EP 08708158A EP 2126886 B1 EP2126886 B1 EP 2126886B1
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EP
European Patent Office
Prior art keywords
temperature
crystal cell
display device
liquid
state time
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EP08708158A
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German (de)
English (en)
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EP2126886A1 (fr
Inventor
Jürgen LITTWIN
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Continental Automotive GmbH
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Continental Automotive GmbH
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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
    • G09G3/20—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, having 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 aforementioned type is made US 5 646 645 A from a dot matrix liquid crystal display system for alternately displaying a positive and negative pattern, which low temperature liquid crystal display system provides an increase in a blink 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 in general, a method for controlling at least one parameter of a liquid crystal cell, which parameter is a temperature of a liquid crystal substance is 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 allows in a simple manner a high attention-getting information display 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 according to the invention in a method of the type mentioned in the entirety of the features of claim 1.
  • 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
  • a blinking of the information representation is maintained even with the aid of the invention, 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 are kept constant at the same time as the switch-on duration is shortened becomes. In this way, a high attention-grabbing effect the information presentation, which attention effect is based on a high blinking frequency and would decrease with reduction of the blinking frequency guaranteed.
  • the method is very advantageous for displaying 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 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, a - 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 respond quickly to temperature fluctuations to ensure reliable flashing without requiring uninterrupted temperature control would.
  • 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 setting of 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 an upper limit temperature is greater than the second temperature and the duty cycle is constant at temperatures above the upper limit temperature ,
  • a lower limit temperature is smaller is 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 display device according to the invention 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 constant Blinkperiodendauer, that is at a constant flashing frequency, at low temperature.
  • a complex additional heating device for the display device can therefore be dispensed with the invention. This not only reduces the manufacturing costs of the display device, but also both the need for electrical energy for operating the display device and the weight of the display device are advantageously reduced.
  • 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 temperature sensor By means of such a sensor can be easily detected a characteristic of the temperature of the liquid crystal substance in the liquid crystal cell temperature, namely the immediate ambient temperature of the liquid crystal cell.
  • 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 1 for a vehicle not 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 inside 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 which can be acted on by an electrical power supply 2 and can be subjected to information which may in principle be variable and / or invariable. 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.
  • the temperature detection device 5 has a temperature sensor 6, which is arranged in the immediate vicinity of the liquid crystal cell 3.
  • 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 Blinkperiodendauer changed in such a way that at a first, lower temperature, the duty cycle at a constant Blink period is less than at a second, higher temperature.
  • 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 and 2:
  • an electric voltage is applied to the liquid crystal cell 3, and the voltage is periodically turned on and off for flashing display of the information so that a blink period duration is one duty the voltage and a turn-off of the voltage has.
  • the duty cycle during the Blinkperiodendauer depends on the temperature, namely 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 is smaller than 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 after FIG. 2 is exemplary valid for a constant over all temperatures Blinkperiodendauer tBP of 1 s. It can be seen that at a first, lower temperature T1 (in this example, about -15 ° C) the on-time tE is smaller than at a second, higher temperature T2 (in this example, about -5 ° C); at the first temperature T1, the switch-on duration is 0.2 s, that is to say the switch-off duration is 0.8 s, and at the second temperature T2 the switch-on duration is 0.3 s, ie the switch-off duration is 0.7 s, and although in each case during a blink period tBP of ls.
  • 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.
  • the blink period tBP2 is prolonged compared to a blink period tBP 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 in this embodiment corresponds to 1 s.
  • a flowchart of a portion of the method first described above shows FIG. 3 ,
  • a temperature T is detected in the form of the ambient temperature of the liquid crystal cell, provided that since a last detection of the ambient temperature a period of 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 takes place (see reference n); on the other hand, if a time span 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 ° C is, (decision: Is detected temperature greater than 0 ° C?). If the temperature is greater than 0 ° C, a duty cycle of 50% and a turn-off of 50%, each based on the Blinkperiodendauer set via a first output (see reference numeral 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 duty cycle of 20% and a turn-off time of 70% in each case based on the Blinkperiodendauer via a second output (see reference numeral n) of the fourth block C in a sixth block C2 , 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).

Claims (8)

  1. Procédé de représentation d'une information, notamment dans un véhicule, au moyen d'un dispositif d'affichage ayant une cellule de cristal liquide,
    - dans lequel on applique une tension électrique à la cellule de cristal liquide et
    - dans lequel la tension pour une représentation clignotante de l'information est appliquée et ne l'est pas périodiquement, de sorte qu'une durée de période de clignotement comporte respectivement une durée dans laquelle la tension est appliquée et une durée dans laquelle la tension n'est pas appliquée,
    - dans lequel la durée (tE) dans laquelle la tension est appliquée pendant la durée (tBP) de la période de clignotement dépend d'une température (T), laquelle température est directement une température d'une substance de cristal liquide de la cellule (3) de cristal liquide ou la température ambiante de la cellule (3) de cristal liquide et
    - dans lequel, en principe, la proportion de la durée (tE) pendant laquelle la tension est appliquée à la durée (tBP) de la période de clignotement est d'autant plus petite que la température (T) est plus basse, la proportion de la durée (tE) pendant laquelle la tension est appliquée à la durée (tBP) de la période de clignotement restant constante dans des plages de température, de manière à avoir une dépendance étagée, en fonction de la température (T), de la durée (tE) pendant laquelle la tension est appliquée, et
    - dans lequel, suivant le principe mentionné ci-dessus, pour une première température (T1) plus basse, la durée (tE) pendant laquelle la tension est appliquée est, pour une durée (tBP) de la période de clignotement restant constante, plus petite que pour une deuxième température (T2) plus haute et
    - dans lequel une température (T0) limite supérieure est plus haute que la deuxième température (T2) et dans lequel, à des températures au-dessus de la température (T0) limite supérieure, la durée (tE) pendant laquelle la tension est appliquée est constante.
  2. Procédé de représentation d'une information suivant la revendication 1, caractérisé en ce qu'une température (Tu) limite inférieure est plus petite que la première température (T1) et dans lequel à des températures en dessous de la température (Tu) limite inférieure, la durée (tBP2) de la période de clignotement est prolongée par rapport à une durée (tBP) de la période de clignotement à des températures au-dessus de la température (Tu) limite inférieure.
  3. Procédé de représentation d'une information suivant la revendication 1 ou 2, caractérisé en ce que l'information est affichée sur la cellule (3) de cristal liquide suivant une représentation positive.
  4. Procédé de représentation d'une information suivant l'une des revendications précédentes, caractérisé en ce que la température (T) est la température ambiante de la cellule (3) de cristal liquide.
  5. Procédé de représentation d'une information suivant l'une des revendications précédentes, caractérisé en ce que la température (T) est repérée à des intervalles de temps réguliers.
  6. Procédé de représentation d'une information suivant l'une des revendications précédentes, caractérisé en ce que, après un repérage de la température (T), il se produit un réglage, qui dépend de la température (T) repérée, de la durée (tE) pendant laquelle la tension est appliquée.
  7. Dispositif d'affichage, notamment pour un véhicule, pour effectuer le procédé suivant l'une des revendications précédentes, comprenant une cellule de cristal liquide pouvant être alimentée en une tension électrique pour la représentation d'une information et une unité de commande reliée électriquement à la cellule de cristal liquide, dans lequel l'unité de commande est telle qu'au moyen de l'unité de commande, la tension pour une représentation clignotante de l'information peut être appliquée et peut ne pas l'être périodiquement, un dispositif (5) de repérage de la température relié électriquement à l'unité (4) de commande étant prévu et dans lequel, au moyen de l'unité (4) de commande et en fonction d'une température (T) repérée par le dispositif (5) de repérage de la température, la durée (tE) pendant laquelle la tension est appliquée pendant une durée (tBP) d'une période de clignotement peut être modifiée, de manière à ce que, pour une première température (T1) plus basse, la durée (tE) pendant laquelle la tension est appliquée soit, pour une durée (tBP) de la période de clignotement restant constante, plus petite que pour une deuxième température (T2) plus haute.
  8. Dispositif d'affichage suivant la revendication 7, caractérisé en ce que le dispositif (5) de repérage de la température comporte un capteur (6) de température disposé à proximité immédiate de la cellule (3) de cristal liquide.
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

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

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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

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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

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DE102007008467A1 (de) 2008-08-21
WO2008101761A1 (fr) 2008-08-28

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