EP1667100A1 - Automatische Anpassung der Vorladungsspannung in einer Elektrolumineszenzanzeige - Google Patents

Automatische Anpassung der Vorladungsspannung in einer Elektrolumineszenzanzeige Download PDF

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Publication number
EP1667100A1
EP1667100A1 EP05111700A EP05111700A EP1667100A1 EP 1667100 A1 EP1667100 A1 EP 1667100A1 EP 05111700 A EP05111700 A EP 05111700A EP 05111700 A EP05111700 A EP 05111700A EP 1667100 A1 EP1667100 A1 EP 1667100A1
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EP
European Patent Office
Prior art keywords
voltage
line
column
columns
lines
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.)
Withdrawn
Application number
EP05111700A
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English (en)
French (fr)
Inventor
Danika Chaussy
Céline MAS
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STMicroelectronics SA
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STMicroelectronics SA
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Publication date
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Publication of EP1667100A1 publication Critical patent/EP1667100A1/de
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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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3216—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using a passive matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • 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
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements

Definitions

  • the present invention relates to electroluminescent display matrix screens composed of a set of light-emitting diodes. These are for example screens composed of organic diodes ("OLED" of the English Organic Light Emitting Display) or polymers ("PLED” of the English Polymer Light Emitting Display).
  • OLED organic diodes
  • PLED polymers
  • the present invention relates more particularly to the regulation of the precharging voltage of the light emitting diode control circuits of such screens. Presentation of the prior art
  • FIG. 1 represents an exemplary matrix screen 10 with light-emitting diodes.
  • Each pixel of the screen 10 consists of a light-emitting diode 12.
  • the diodes 12 are arranged in Y rows and X columns.
  • the cathodes of the diodes 12 of the same line are connected to a line electrode 14, and the anodes of the diodes 12 of the same column are connected to a column electrode 16.
  • the display of an image on the screen 10, according to the standards usually used, is obtained by displaying a frame or two successive frames.
  • the addressing of the matrix screen 10 becomes line after line via a line control circuit 18 (commonly called driver lines).
  • the line electrode 14 of the selected or active line is connected to the ground while the line electrodes of the idle lines are left at high impedance or are connected to a high potential.
  • the information corresponding to the activation or non-activation of the diodes 12 of the active line will be transmitted by the column electrodes 16 via a column control circuit 20 (commonly called driver columns) which injecting a current into the column electrodes 16 connected to the diodes 12 to be activated.
  • FIG. 2 represents a more accurate modeling of a pixel of the matrix screen 10 of FIG. 1.
  • Each pixel consists of a non-resistive and non-capacitive light emitting diode 12 in parallel with a parasitic capacitor 22.
  • a parasitic capacitor can have a capacity of about 25 picofarads.
  • a first resistor 24 in series with the diode 12 represents the resistance of the portion of the column electrode 16 connected to the pixel.
  • a second resistor 25 in series with the diode 12 represents the resistance of the portion of the line electrode 14 connected to the pixel.
  • part of the current during the activation of a pixel will first be necessary to charge the parasitic capacitor 22 to the voltage at which the diode 12 is to operate. Only a part of the current is therefore used for light emission.
  • the luminance of the diode 12 will be proportional to the average time during which the diode 12 is crossed by a current and the average value of this current.
  • the consumption of an activated pixel of a matrix screen with organic light-emitting diodes is broken down into a consumption for the light emission of the diode 12 of the pixel, which represents approximately 57% of the total consumption, a parasitic consumption, about 40%, related to the capacitance of the pixel, and a resistive consumption of about 3%, related to the resistances series 24, 25 of the pixel.
  • the time required to charge the parasitic capacitance 22 associated with the pixel defines the ON duration of the pixel and reduces the duration of the active phase corresponding to the luminous emission of the pixel.
  • the duration of ON depends in particular on the intensity of the current supplied to the pixel to be activated.
  • the overall duration of an addressing phase of a pixel being constant, the longer the ON duration is important, the lower the luminance achieved for the same current passing through the diode 12.
  • each pixel of the screen 10 precharges all the pixels of a matrix screen before selecting a line of the screen.
  • the preloaded addressing makes it possible to bias each pixel of the screen 10 to a voltage close to that which it would have if it were active so that the current injected into a diode 12 to be activated is only used for light emission. and not to charge the parasitic capacitance 22 of the pixel.
  • FIGS. 3A to 3C describe successive steps of addressing with preloading of the pixels.
  • FIGS. 3A to 3C there is shown a single column electrode 16 of the screen 10 of FIG. 1 and isolated a single pixel 26, connected to the column electrode 16, which one wishes to activate.
  • the pixel 26 is represented by a diode 12 and an associated parasitic capacitance 22 (the parasitic resistors 24, 25 not being represented).
  • the line electrode 14 connected to the pixel 26 and represented the other line electrodes of the screen 10 is represented by a single branch 14 'connected to the anode of the diode 12.
  • a capacitor 22' is represented on the branch 14 'and is equivalent to the set of parasitic capacitors in parallel with the pixels connected to the column electrode 16 and the other row electrodes of the screen 10.
  • the capacitance of the capacitor 22' is substantially equal to (Y - 1 ) times the capacitance of a parasitic capacitor 22.
  • the line control circuit 18 comprises two switches 27, 28 for connecting the line electrode 14 alternately GND ground or a high voltage V OFF . As only the line electrode 14 is activated, for the other lines of the screen, the line control circuit has been symbolized by two switches 27 ', 28' making it possible to connect the branch 14 'alternately to the ground GND or the high voltage V OFF .
  • the column control circuit 20 comprises three switches 31, 32, 33 making it possible to connect the column electrode 16 alternatively to ground GND, to a precharge potential V PRE or to a first terminal of a current source I LUM .
  • the second terminal of the current source I LUM is connected to a bias voltage source V POL .
  • FIG. 3A represents a first step of a preload addressing consisting, between the successive selection of two lines of the screen 10, of discharging all the pixels of the screen 10. All the lines of the screen are then inactive, which means that all line electrodes 14, 14 'of the screen 10 are connected to the high voltage V OFF . Each column electrode 16 is then connected to the ground GND, via the switch 31, so as to discharge the parasitic capacitors 22, 22 'of all the pixels connected to the column electrode 16.
  • FIG. 3B represents a second step consisting, before the selection of a line, in previously loading all the pixels of the screen 10. All the row electrodes 14, 14 'remain connected to the high voltage V OFF . Each column electrode 16 is brought to a precharge voltage V PRE via the switch 32. The parasitic capacitor 22 of each pixel is then preloaded to the voltage V PRE- V OFF . The tension of Preload V PRE is close to the voltage at which the column electrode 16 can operate when activating pixels in the next step.
  • FIG. 3C represents a third step, or active phase, corresponding to the activation of the pixel 26.
  • the line electrode 14 connected to the pixel 26 to be activated is connected to ground GND via switch 27.
  • Line electrodes 14 inactive lines remain connected to the high voltage V OFF .
  • the current source I LUM is connected to the pixel 26 via the switch 33. A current can therefore flow through the diode 12 which emits light.
  • the current source I LUM has to charge only the capacitor 22 whose capacity is (Y-1) times smaller than the capacity of the capacitor 22 ', which affects very little the ON time of the diode 12.
  • the voltage on the anode of the diode 12 is stabilized at an operating voltage V COL .
  • the purpose of the first discharge step is to discharge the parasitic capacitors 22 from all the pixels of the screen so as to erase the residual charges of the pixels that could come from the activation of pixels of the screen 10 at previous steps.
  • the second precharging step makes it possible to reduce the ON duration of the pixel so as to obtain an active phase duration that is substantially independent of the intensity of the illumination, that is to say the intensity of the current flowing in diodes in the active phase.
  • the light-emitting diodes of a screen are not identical and, for the same luminance current, the voltages across activated diodes may be different. However, since such differences are generally relatively small, the same precharging voltage is applied to each column selected to simplify the column control circuit.
  • the precharging voltage is predefined, for example empirically, and remains constant during the operation of the screen.
  • a predefined precharge voltage is generally not optimal. Indeed, the operating voltage of a selected column can vary significantly depending on the luminance current I LUM which can change for each selected line.
  • the voltage across the diode tends to increase with aging of the diode. For the same luminance, corresponding to a given luminance current, the operating voltage of the column therefore changes with time.
  • the voltage applied to the selected column changes from the precharge voltage to the operating voltage.
  • the precharging voltage must therefore not be too far from the operating voltage of the column so as not to modify the brightness of the activated light-emitting diode. Indeed, if the precharging voltage is too high, too much current can temporarily pass through the activated light-emitting diode, the active line then appearing with a light intensity higher than the desired light intensity. Conversely, if the precharge voltage is too low, the voltage of each selected column must rise from the precharge voltage to the operating voltage. The current flowing through the active light-emitting diode may be temporarily below the desired value, the active line then appearing with a light intensity lower than the desired light intensity.
  • An object of the present invention is to provide a control circuit of a matrix screen comprising a device providing a precharge voltage which depends on the operating voltages of the columns.
  • Another object of the present invention is to provide a control circuit of a matrix screen comprising a simple design precharge voltage supply device.
  • the present invention provides a control circuit of a matrix screen composed of light-emitting diodes distributed in rows and columns, adapted to successively select lines of the screen, and, for each line of a set of selected lines, selecting columns to make the light-emitting diodes of said line and said selected columns conductive, the voltage of each selected column stabilizing at an operating voltage, said circuit being further adapted, before the selection of each line of said set of lines, to precharge at least said columns to be selected at a precharge voltage.
  • the control circuit includes a precharge voltage adjusting device comprising a measuring circuit adapted, at each selection of a line of said set of lines, for measuring the maximum operating voltage among the operating voltages of said selected columns; a storage circuit adapted, at each selection of a line of said set of lines, to memorize the measured maximum operating voltage; and an adjustment circuit adapted, after each line selection of said set of lines, to adjust the precharge voltage from the stored maximum operating voltage.
  • a precharge voltage adjusting device comprising a measuring circuit adapted, at each selection of a line of said set of lines, for measuring the maximum operating voltage among the operating voltages of said selected columns; a storage circuit adapted, at each selection of a line of said set of lines, to memorize the measured maximum operating voltage; and an adjustment circuit adapted, after each line selection of said set of lines, to adjust the precharge voltage from the stored maximum operating voltage.
  • the measuring circuit is adapted, at each selection of a line of said set of lines, to measure the maximum voltage among the column voltages of the matrix screen, the measuring circuit comprising a protection circuit adapted to deactivate the measurement circuit for each column associated with a non-conductive light-emitting diode.
  • the storage circuit is adapted to keep the measurement of the maximum operating voltage for at least the duration of the display of an image on the matrix screen in the absence of new measurement of maximum operating voltage.
  • the control circuit comprises a current mirror comprising a reference branch and a plurality of duplication branches connected to a bias voltage, each duplication branch being connected to a column, the reference branch being connected to a source of a reference current.
  • each branch of the current mirror comprises a PMOS-type field effect duplication transistor whose source is connected to the bias voltage, the gates of the transistors of each branch being connected together, the drain and the gate of the transistor of the reference branch being connected to the reference current source, the drains of the transistors of the duplication branches being connected to the columns.
  • the measurement circuit comprises, for each column, a PMOS type field effect protection transistor whose source is connected to the bias voltage and whose gate is connected to the drain of the duplicating transistor and an NMOS type field effect measuring transistor, the drain of which is connected to the drain of the protective transistor and whose gate is connected to the column, the sources of the measurement transistors being connected to a measuring point .
  • the storage circuit comprises a capacitor, a terminal of which is connected to the measurement point via a switch.
  • the present invention also provides a method for adjusting a precharge voltage of a control circuit a matrix screen composed of light-emitting diodes distributed in rows and columns, comprising the step of successively selecting rows of the matrix screen and repeating, for each line of a set of selected lines, the steps of preload columns at the precharge voltage; selecting said line; selecting columns to make the light-emitting diodes of said line and said selected columns conductive, the voltage of each selected column stabilizing at an operating voltage; measuring the maximum operating voltage among the operating voltages of said selected columns; memorizing said maximum operating voltage; and adjusting the precharge voltage from the stored maximum operating voltage.
  • the step of measuring the maximum operating voltage comprises the steps of providing a circuit adapted, at each selection of a line of said set of lines, to measure the maximum voltage among the column tensions of the matrix screen and to deactivate the measuring circuit for each column associated with a non-conductive light emitting diode.
  • said maximum operating voltage is stored for at least the duration of the display of an image on the matrix screen in the absence of a new measurement of maximum operating voltage.
  • FIG. 4 represents an exemplary embodiment of column control circuits and the device for supplying the precharging voltage according to the present invention.
  • the column control circuits comprise a current mirror 40 composed in the present example of a short reference branch and n duplication branches b 1 to b n .
  • Each branch is composed of a PMOS transistor, P ref for the reference branch and P 1 to P n for the branches b 1 to b n .
  • the sources of the transistors of each of the branches are connected to the bias voltage V POL and the gates are connected to each other.
  • the drain and the gate of the transistor P ref of the short reference branch are connected to a source of a power PMOS transistor X ref .
  • the drain of transistor X ref is connected to a terminal of a reference current source 42 at a point C ref .
  • the other terminal of the current source 42 is connected to a low reference potential, for example the ground GND.
  • the gate of the power transistor X ref is connected to the point C ref .
  • the reference current source 42 provides a luminance current I LUM .
  • the drain of each transistor P i i being between 1 and n, is connected to the source of a PMOS power transistor X i whose drain is connected to a point Ci of a column electrode (not shown).
  • Each power transistor, X ref and X 1 to X n limits the voltage between the source and the drain of the transistor, P ref and P 1 to P n , corresponding to the operating range of this transistor.
  • each power transistor X i i being between 1 and n, is connected to a terminal of a two-position switch Ii, controlled by a signal ⁇ Ci , adapted to connect the gate of transistor X i to the point reference C ref when the signal ⁇ Ci is for example at a high level or at the bias voltage V POL when the signal ⁇ Ci is at a low level.
  • the control circuits furthermore comprise, for each column, a switch (not shown) adapted to connect the point Ci to ground GND and a switch (not shown) adapted to connect the point Ci to the precharging voltage.
  • the present invention consists in providing for each duplication branch bi, i being between 1 and n, a measurement circuit mi comprising a PMOS transistor P ' i , the source of which is connected to the bias voltage V POL and whose gate is connected to the drain of the transistor Pi of the corresponding duplication branch bi.
  • the drain of each transistor P'i is connected to the source of a power PMOS transistor X ' i whose gate is connected to the gate of the power transistor X i of the corresponding duplication branch bi.
  • the power transistor X ' i makes it possible to limit the voltage between the source and the drain of the transistor P'i associated with the operating range of this transistor.
  • each power transistor X ' i is connected to the drain of a NMOS transistor N i , mounted as a follower, whose gate is connected to the point Ci.
  • the sources of the transistors N 1 to N n are connected to a point C o , at a terminal of a current source 44 whose other terminal is connected to GND ground.
  • the current source 44 supplies a bias current I POL for biasing the NMOS transistors N 1 to N n .
  • a switch 46 controlled by a signal T ON , makes it possible to connect the point C o to a terminal of a capacitor C HOLD whose other terminal is connected to ground GND.
  • the voltage at the terminals capacitor C HOLD drives an amplifier 48 which supplies the precharge voltage V PRE .
  • the switch 46 is then closed and the voltage between the node C o and the ground GND is applied across the capacitor C HOLD .
  • the switch 46 is closed only when at least one pixel of a line is illuminated.
  • the duration of closure of the switch 46 may vary but does not exceed the duration of a phase of activation of a line of the screen to prevent the discharge of the capacitor C HOLD with the current I POL .
  • the amplifier 48 From the voltage stored at the terminals of the capacitor C HOLD , the amplifier 48 supplies a new precharge voltage V PRE which is used during the next step of precharging the columns.
  • the transistor Xi is blocked and the corresponding point C i is connected to ground.
  • the transistor N i is then blocked.
  • the voltage between the point C i and the ground GND is therefore not taken into account for the determination of the precharge voltage V PRE .
  • the present invention thus makes it possible to adjust the precharge voltage V PRE as a function of the temporal variations of the operating voltages of the diodes of the screen.
  • the device according to the invention allows, in addition, the provision of a precharge voltage V PRE independently of the presence of "open” pixel or "shorted” pixel defects.
  • An "open” pixel corresponds to a break in the connection between the column and the anode of the light emitting diode of the pixel or to a break in the connection between the line and the cathode of the light emitting diode.
  • a “shorted” pixel corresponds to a short circuit between the line and the column at the pixel level.
  • the transistor P ' 1 therefore makes it possible not to take into account the operating voltage of an "open" pixel column.
  • the point C 1 is directly connected to ground.
  • the transistor N 1 is thus blocked.
  • the voltage between the point C 1 and the ground GND is therefore not taken into account for the determination of the precharge voltage V PRE .
  • the capacity of the capacitor C HOLD is large enough to limit leaks at the capacitor C HOLD at least for the duration corresponding to the activation of all the lines of the screen. This allows to provide a voltage V PRE precharge even if only one line of the screen is illuminated when displaying an image on the screen.
  • the present invention is susceptible of various variations and modifications which will be apparent to those skilled in the art.
  • the current mirrors can be made with a larger number of transistors.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)
EP05111700A 2004-12-06 2005-12-05 Automatische Anpassung der Vorladungsspannung in einer Elektrolumineszenzanzeige Withdrawn EP1667100A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0452867A FR2879007A1 (fr) 2004-12-06 2004-12-06 Adaptation automatique de la tension de precharge d'un ecran electroluminescent

Publications (1)

Publication Number Publication Date
EP1667100A1 true EP1667100A1 (de) 2006-06-07

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US (1) US8044892B2 (de)
EP (1) EP1667100A1 (de)
JP (1) JP5027408B2 (de)
FR (1) FR2879007A1 (de)

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US8044892B2 (en) 2011-10-25
US20060118700A1 (en) 2006-06-08

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