EP1739649A1 - Passiv-Matrix-Anzeige mit einer Einrichtung zur Kompensation der Widerstandsverluste - Google Patents

Passiv-Matrix-Anzeige mit einer Einrichtung zur Kompensation der Widerstandsverluste Download PDF

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Publication number
EP1739649A1
EP1739649A1 EP05300526A EP05300526A EP1739649A1 EP 1739649 A1 EP1739649 A1 EP 1739649A1 EP 05300526 A EP05300526 A EP 05300526A EP 05300526 A EP05300526 A EP 05300526A EP 1739649 A1 EP1739649 A1 EP 1739649A1
Authority
EP
European Patent Office
Prior art keywords
line
column
electrode
emitters
electrodes
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Withdrawn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
EP05300526A
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English (en)
French (fr)
Inventor
Sylvain Thiebaud
Jean-Paul Dagois
Pierrick Martin
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.)
InterDigital CE Patent Holdings SAS
Original Assignee
Thomson Licensing SAS
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Filing date
Publication date
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP05300526A priority Critical patent/EP1739649A1/de
Publication of EP1739649A1 publication Critical patent/EP1739649A1/de
Withdrawn legal-status Critical Current

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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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
    • 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
    • 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

Definitions

  • the invention relates to passive matrix electroluminescent diode panels for displaying images and a method for controlling these panels.
  • the diodes of such panels can be controlled current or voltage.
  • the current control as described for example in WO03 / 107318 , requires current generators that are economically disadvantageous; this current control method is also penalized by high parasitic capacitance charging times each time a new line of diodes to be addressed is selected, unless a pre-charge device is added, which increases still the cost of the panel.
  • the voltage control which is more economical and allows the quasi-instantaneous load parasitic capacitances, requires on the other hand compensations ohmic losses along the supply electrodes.
  • the document W02004 / 027743 proposes to add, at the head of each column electrode, a device for controlling injected charges (product of current by duration) which is slaved to a voltage setpoint addressed to a diode of this column, which diode is also selected by a line electrode.
  • a load control device and its servocontrol at the head of each column is economically disadvantageous.
  • An object of the invention is to avoid the aforementioned drawbacks.
  • the subject of the invention is a passive matrix image display or lighting device comprising an array of light emitters, an array of line electrodes and a network of column electrodes for feeding in voltage these emitters, and means able to compensate, without video processing, and at least partially, the differences in connection resistance of these emitters via these electrodes.
  • these compensation means are able to compensate for both differences in column resistances and differences in line resistances.
  • connection resistance of an emitter is the sum of the resistance between one of the output terminals of the generator able to supply it and the point of connection of this emitter to its line electrode, and of on the other hand, the resistance between the other of the output terminals of this generator and the point of connection of this emitter to its column electrode. Any other definition of the connection resistance of the transmitters can be retained without departing from the invention, as long as it does not change the differences between the connection resistances of these transmitters.
  • the "point" of line and column connection of a transmitter generally corresponds to a portion of the line electrode and a portion of the column electrode that form two feed electrodes of that emitter.
  • the "point" of supply of the line electrode and the column electrode generally corresponds to one end of these electrodes.
  • the so-called "line” resistance of a transmitter being defined as the resistance of the line electrode to which this emitter is connected, taken between the supply point of this line electrode and the connection point of the transmitter.
  • said compensation means are able to compensate for the differences between the so-called “line” resistors of the emitters of each line.
  • the subject of the invention is also a method for controlling an image display or lighting device according to the invention, characterized in that ... if the "line" resistance difference between two transmitters which are connected to the same row electrode and to two adjacent column electrodes of the panel is approximately constant irrespective of the column electrodes and line electrodes considered, and is worth R r , ...
  • the emitters of the panel can be divided into several sets according to their emission color and / or their electrical characteristics: for example, a first set of emitters of a first type which are able to emit a red light, a second set of emitters emitters of a second type which are able to emit a green light, a third type of emitters of a third type that are able to emit a blue light.
  • Each type of transmitter has different electrical characteristics, including current-voltage characteristics.
  • the compensation means are adapted to ensure an identical voltage between the terminals of each transmitter of this group.
  • the documents EP 1439518 and WO 2004/114273 disclose ohmic loss compensation means in the LED connecting electrodes which are essentially applicable to active matrix image display panels, wherein the electrodes of one of the arrays are common to all the diodes and form usually an upper layer of the panel.
  • the electrodes of the other network are integrated into the matrix of the panel, as in the case of passive matrix panels. Consequently, the compensation means described in the documents EP 1439518 and WO 2004/114273 , only compensate the ohmic losses in a single array of electrodes, whereas the invention relates here passive matrix panels with two power supply electrode arrays and allows to compensate the ohmic losses simultaneously for both electrode networks.
  • the documents JP10-112391 and JP07-295509 do not give any teaching on the compensation of the ohmic losses simultaneously for the two networks of electrodes which feed the emitters.
  • the device conventionally comprises a display panel which is provided with a network of light emitters, here electroluminescent organic diodes, known in themselves, each feedable between two terminals, a network of N row electrodes Y 1 , Y 2 , ..., Y j , ..., Y N , and a network of P column electrodes X 1 , X 2 ,..., X i ,... X P , to supply transmitters; the terminals of each transmitter are connected on the one hand to a line electrode, to a line connection point, and on the other hand to a column electrode, to a column connection point.
  • the display panel does not include control circuits for each transmitter: it is therefore a passive matrix panel.
  • the device comprises supply means which comprise in particular a voltage generator 2 adapted to deliver a voltage V 0 between two output terminals: only one terminal is shown in the figures, the other terminal being connected to a ground line.
  • supply means comprise in particular a voltage generator 2 adapted to deliver a voltage V 0 between two output terminals: only one terminal is shown in the figures, the other terminal being connected to a ground line.
  • the device also comprises means 5 capable of successively selecting each line of transmitters, by connecting, with the aid of a controllable line-selection switch S 1 , S 2 , ..., S N , a point of supplying the line electrode Y 1 , Y 2 ,..., Y N , to which these emitters are connected to the output terminal of the generator 2 which is connected to a ground line via a common line electrode 55 and another line of mass.
  • the feed points of the line electrodes are located at the ends of these electrodes on the same side of the panel.
  • the device also comprises means 4 capable of addressing transmitters of the same line so that they emit light, by simultaneously connecting, with the aid of controllable column addressing switches A 1 , A 2 , A 3 , ..., A P , a feed point of each of the column electrodes X 1 , X 2 ,..., X P , to which these emitters are connected to the other output terminal of the generator 2 via a common column electrode 44.
  • the feed points of the column electrodes are located at the ends of these columns. electrodes on the same side of the panel.
  • the control of the switches A 1 , A 2 , A 3 ,..., A P is adapted to control, in particular according to video data, the supply duration of the emitters so as to obtain control of the panel by modulation. of duration. This command is referenced "PWM"("Pulse Width Modulation”) in the figures.
  • Controlling the closing of the switches A i and S j therefore makes it possible to connect the generator 2 to any emitter E ij so that it emits light.
  • the current flowing through the transmitter depends on the values of i and j, that is to say on the position of this emitter on the panel.
  • the device also comprises means capable of compensating at least partially the differences in connection resistance R Eij emitters, two embodiments of which will now be described.
  • the generator 2 are associated with column compensation means 3 able to compensate for differences in connection resistance called “column".
  • the so-called “column” resistance of an emitter is defined as the resistance of the column electrode to which this emitter is connected, taken between the supply point of this column electrode and the point of connection of this emitter on this column electrode; for a transmitter E ij , this column resistance is therefore R co + (j-1) ⁇ R c .
  • each column corresponds to the same primary color, and the columns of different primary colors are alternated.
  • Such resistance compensation means of the column electrodes are particularly simple and economical to implement and allow the voltage control of the emitters of the panel, which is advantageous because it limits the preload times, which allows to increase by the transmission durations when displaying the images, and thus to improve the luminous performances of the panel.
  • this device makes it possible to use economic column control means which integrate globally for the whole panel only three voltage generators according to this device, instead of a current generator by column electrode as in the current drivers of the device. walk.
  • This device is also much simpler and more economical to implement than specific video data processing devices capable of compensating for differences in connection resistance, especially since such video processing often involves a loss of definition of the levels of gray of each color.
  • compensating means that are able to compensate not only the differences in column resistance as before, but also the differences in resistances. say "line”.
  • the so-called “line” resistance of a transmitter is defined as the resistance of the line electrode to which this emitter is connected, taken between the supply point of this line electrode and the point of connection of this emitter on this line electrode; for a transmitter E ij , this line resistance is therefore R ro + (i-1) ⁇ R r .
  • a difficulty for the compensation of differences in line resistance comes from the fact that the different resistances R r between the successive points of connection of transmitters on the same line electrode are generally traversed by different currents, at least when several transmitters of this line are activated simultaneously, ie when the "PWM" command simultaneously closes several addressing switches.
  • V inc (j-1) ⁇ R c .
  • the compensation means here comprise on the one hand the same column compensation means 3 as those previously described in the first embodiment, but also elements added to the addressing means 4 'which are able to partially compensate for the differences in line resistors, as described below.
  • the common feed electrode of the columns 44 is interrupted: between the successive connection points of this electrode to a switch controlling the emission duration A 1 , A 2 , A 3 , ..., A P , there are in this embodiment of voltage generators G 0 , G 1 , ..., G p-1 , which are programmed using commands; each generator G i is able to deliver a voltage ⁇ V i proportional to its control C i .
  • each adder Add (i-1) comprises two inputs and an output: one of the inputs is connected to the control (value 1 or 0) of the switch A i , which is able to connect the common column electrode 44 to the column electrode X i ; the other input is connected to the output of adders Add (i) of the next column if it exists; the output of this adders Add (i-1) is connected to the input of the adder Add (i-2) of the previous column if it exists, and also forms the command C (i-1) of the generator G ( i-1) which is interposed on the common column electrode between the connection point of the switch A (i-1) and that of the switch A i .
  • V 0 + j - 1 For each emitter E ij , we now have the equation: V 0 + j - 1 .
  • V 0 - V d R vs ⁇ o + R d ⁇ i d .
  • i d (V 0 -V d ) / (R co + R d ).
  • the present invention is applicable to all types of light emitter panels, especially those that are current-controllable like light-emitting diodes.

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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)
EP05300526A 2005-06-28 2005-06-28 Passiv-Matrix-Anzeige mit einer Einrichtung zur Kompensation der Widerstandsverluste Withdrawn EP1739649A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05300526A EP1739649A1 (de) 2005-06-28 2005-06-28 Passiv-Matrix-Anzeige mit einer Einrichtung zur Kompensation der Widerstandsverluste

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Application Number Priority Date Filing Date Title
EP05300526A EP1739649A1 (de) 2005-06-28 2005-06-28 Passiv-Matrix-Anzeige mit einer Einrichtung zur Kompensation der Widerstandsverluste

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EP1739649A1 true EP1739649A1 (de) 2007-01-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111034359A (zh) * 2017-08-30 2020-04-17 平面***公司 用于led驱动器电路***的输出级的电流控制器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6400348B1 (en) * 1999-06-25 2002-06-04 Koninklijke Philips Electronics N.V. Active matrix electroluminescent display device
US20020149547A1 (en) * 2001-01-29 2002-10-17 Robertson John A. Transparent programmable LED display panel and method
US6580407B1 (en) * 1994-06-08 2003-06-17 Canon Kabushiki Kaisha Electron-beam generating device having plurality of cold cathode elements, method of driving said device and image forming apparatus applying same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6580407B1 (en) * 1994-06-08 2003-06-17 Canon Kabushiki Kaisha Electron-beam generating device having plurality of cold cathode elements, method of driving said device and image forming apparatus applying same
US6400348B1 (en) * 1999-06-25 2002-06-04 Koninklijke Philips Electronics N.V. Active matrix electroluminescent display device
US20020149547A1 (en) * 2001-01-29 2002-10-17 Robertson John A. Transparent programmable LED display panel and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JUAN C-J ET AL: "A VOLTAGE COMPENSATION CONTROLLER FOR LIGHTING PASSIVE MATRIX ORGANIC LIGHT EMITTING DIODES PANELS", 2003 SID INTERNATIONAL SYMPOSIUM DIGEST OF TECHNICAL PAPERS. BALTIMORE, MD, MAY 20 - 22, 2003; [SID INTERNATIONAL SYMPOSIUM DIGEST OF TECHNICAL PAPERS], SAN JOSE, CA : SID, US, 20 May 2003 (2003-05-20), pages 1134 - 1137, XP001174237 *
JUAN C-J ET AL: "A VOLTAGE-COMPENSATED DRIVER FOR LIGHTING PMOLEDS PANELS", IEEE TRANSACTIONS ON CONSUMER ELECTRONICS, IEEE SERVICE CENTER, NEW YORK, NY, US, vol. 49, no. 2, 1 May 2003 (2003-05-01), pages 263 - 268, XP001171285, ISSN: 0098-3063, DOI: 10.1109/TCE.2003.1209512 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111034359A (zh) * 2017-08-30 2020-04-17 平面***公司 用于led驱动器电路***的输出级的电流控制器
CN111034359B (zh) * 2017-08-30 2023-01-10 平面***公司 用于led驱动器电路***的输出级的电流控制器

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