EP1622120A1 - Anzeigevorrichtung mit aktiver Matrix und Verfahren zur Steuerung einer solchen Vorrichtung - Google Patents

Anzeigevorrichtung mit aktiver Matrix und Verfahren zur Steuerung einer solchen Vorrichtung Download PDF

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Publication number
EP1622120A1
EP1622120A1 EP04292622A EP04292622A EP1622120A1 EP 1622120 A1 EP1622120 A1 EP 1622120A1 EP 04292622 A EP04292622 A EP 04292622A EP 04292622 A EP04292622 A EP 04292622A EP 1622120 A1 EP1622120 A1 EP 1622120A1
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EP
European Patent Office
Prior art keywords
data
modulator
column
transmitter
voltage
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Withdrawn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
EP04292622A
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English (en)
French (fr)
Inventor
Philippe Le Roy
Dominique Gagnot
Hassane Guermoud
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Thomson Licensing SAS
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Thomson Licensing SAS
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Filing date
Publication date
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to JP2007523123A priority Critical patent/JP5153331B2/ja
Priority to PCT/FR2005/002005 priority patent/WO2006018553A1/fr
Priority to KR1020077002858A priority patent/KR101185897B1/ko
Priority to EP05793298A priority patent/EP1771838B1/de
Priority to DE602005024139T priority patent/DE602005024139D1/de
Priority to TW094125693A priority patent/TWI426489B/zh
Publication of EP1622120A1 publication Critical patent/EP1622120A1/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Withdrawn legal-status Critical Current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]
    • G09G3/3225—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 an active matrix
    • G09G3/3233—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 an active matrix with pixel circuitry controlling the current through the light-emitting element
    • 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
    • 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
    • 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]
    • 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
    • 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
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • 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
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G09G2320/0295—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel by monitoring each display pixel
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems
    • 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

Definitions

  • the present invention relates to a display device, a display control circuit and an image display method.
  • Image display devices are increasingly used in all kinds of applications such as in motor vehicles, digital cameras or mobile phones.
  • OLED Organic Light Emitting Diode
  • passive matrix OLED display devices are already widely commercialized. However, they consume a lot of electrical energy and have a reduced life.
  • Active Matrix OLED displays have built-in electronics, and have many benefits such as reduced power consumption, high resolution, compatibility with video rates, and longer life than OLED display devices passive matrix.
  • these display devices comprise an active matrix formed in particular by a network of light emitters.
  • Each light emitter is linked to a pixel or subpixel of an image to be displayed and is addressed by an array of column electrodes and line electrodes via an addressing circuit.
  • the addressing circuits include current modulators able to control the current flowing through the emitters and therefore the luminance of each pixel or sub-pixel of the display device.
  • these modulators are thin-film transistors, called Thin Film Transistors (TFTs), made of polycrystalline silicon using low-temperature poly-crystalline silicon (LTPS) technology from a silicon layer. amorphous.
  • TFTs Thin Film Transistors
  • LTPS low-temperature poly-crystalline silicon
  • this technology introduces local spatial variations of the trigger threshold voltage between these transistors. These variations are due to the fact that the seals and grain size of silicon are not sufficiently controllable during the step of crystallization of amorphous silicon (Si-a) in polycrystalline silicon (Poly-Si).
  • TFT transistors fed by the same supply voltage and controlled by identical voltages or display currents generate currents of different intensities.
  • the threshold threshold voltages of the thin film transistors may vary inhomogeneously over time.
  • an emitter emits a luminous intensity directly proportional to the current flowing through it
  • the heterogeneity of the triggering thresholds of these transistors causes a non-uniformity of the brightness of the emitter. display device comprising such transistors. This results in differences in luminance levels and obvious visual discomfort for the user.
  • document EP-1 340 019 discloses a display device comprising a compensation circuit comprising an operational amplifier whose output is connected to the gate of a modulator and whose non-inverting input is connected successively to the anode of each transmitter of the same column, without passing through the modulator associated with said transmitter.
  • this device is extremely complicated. It requires in particular the control of a large number of switches.
  • the object of the present invention is the implementation of a simpler display device.
  • the present invention relates to an active matrix image display device characterized in that one of the non-inverting input and the inverting input of the operational amplifier is connected to said output supply means for forming, with the gate of the modulator connected to the output of the operational amplifier, a feedback loop of the operational amplifier, when one of said transmitters is selected.
  • the input of the operational amplifier is not connected to the common terminal of the emitter-modulator series of each pixel, but to one of the ends of this series.
  • the invention therefore makes it possible to directly control the supply current of the emitters in each supply column of the emitters.
  • An advantage of the invention is that this control is performed without measuring this current.
  • Each emitter is periodically addressed to each image to be displayed, or several times for each image, according to the display method used.
  • the device comprises one or more of the following characteristics.
  • One of said ends of each emitter-modulator series of said column which is connected to the output of said supply means, corresponds to the drain or source of said modulators.
  • the output of the operational amplifier 35 then delivers a control signal V c which is a function of the display signal V data 22 , V data 23 and the trigger threshold voltage V th of the modulator 26 connected to the selected transmitter 22. 23, 24.
  • the control signal V c is adapted to charge the capacitor 30.
  • One of the non-inverting input (+) and the inverting input (-) of the operational amplifier connected to the output is adapted to receive a signal dependent on the value of the display signal to be addressed to a transmitter selected in said column.
  • Said supply means furthermore comprise a control generator which is adapted to successively supply power and discontinue each of the emitters of a column by supplying a control signal to one of said ends of the transmitter-modulator series. corresponding to said transmitter, said control signal depending on the value of the display signal to be addressed to a selected transmitter in said column.
  • a control generator which is adapted to successively supply power and discontinue each of the emitters of a column by supplying a control signal to one of said ends of the transmitter-modulator series. corresponding to said transmitter, said control signal depending on the value of the display signal to be addressed to a selected transmitter in said column.
  • the supply means then generally further comprise a holding generator whose function is to feed the column transmitters out of their addressing phases.
  • a holding generator whose function is to feed the column transmitters out of their addressing phases.
  • Such a device requires switching means adapted to switch the power of the transmitters between the control generator and the sustain generator. In practice, therefore, there are generally two additional switches in each addressing circuit, one for connecting the transmitter-modulator series of this circuit to the addressing generator during the addressing phases, the other for connecting this series. transmitter-modulator to the sustain generator outside the addressing phases.
  • the output of the driving generator is connected to one of the non-inverting input (+) and the inverting input (-) of the operational amplifier. Only during the addressing of an emitter of this column, this same output is also connected, via a closed switch for addressing, to said end of the corresponding emitter-modulator series.
  • Said control generator comprises a display voltage generator and a resistive element connected in series, and the voltage generator is adapted to generate a voltage dependent on the value of the display signal intended to be addressed to a transmitter selected in said column.
  • This resistance may be an internal resistance to the voltage generator.
  • the value of the current flowing in this resistor and therefore in this emitter is independent of the tripping threshold voltage of the modulator associated with this emitter.
  • the value of the current is then on the one hand proportional to the difference between said value of the display signal and the value of the voltage applied to the other one of the non-inverting input and the inverting input of the operational amplifier. on the other hand inversely proportional to the resistance value of the resistive element.
  • This resistance may be an internal resistance to the voltage generator. Thanks to this series resistance, the value of the current flowing in this resistor and therefore in this emitter is independent of the tripping threshold voltage of the modulator associated with this emitter. The value of the current is then on the one hand proportional to the difference between said sum of the values of the display signal and the value of the voltage applied to the other one of the non-inverting input and the inverting input of the operational amplifier, on the other hand inversely proportional to the value of the resistance of the resistive element.
  • the output of the driving generator is connected on the one hand to one of the non-inverting input (+) and the inverting input (-) of the operational amplifier, on the other hand, without intermediate switch, to said end of the corresponding emitter-modulator series.
  • Said control means also comprise a reference generator capable of delivering a reference signal to the other from the inverting input (-) and the non-inverting input (+) of the operational amplifier.
  • Each transmitter has particular electrical and / or optical properties and the value of each reference signal is a function of said electrical and / or optical properties.
  • Each transmitter is associated with the illumination of a color, and the reference signal is able to be modulated according to the color assigned to said selected transmitter.
  • a given white shade is classically identified by its trichromatic coordinates. Thanks to the invention, it is possible to easily optimize the chromatic performances of the device and to compensate for the differences in aging between the emitters.
  • the emitters are grouped into pluralities of adjacent emitters adapted to each emit a different color, and, for each plurality, said reference signals are allocated to the different emitters of this plurality so that the addressing of these emitters by the same value display signal generates the emission of said white color by this plurality.
  • Said control means further comprise data storage means capable of storing the value of the display signal addressed to each transmitter during an image duration.
  • the method comprises the characteristic according to which the control signal is a function of the sum of the values of the display signals addressed to all the emitters of the column during an image duration.
  • FIG. 1 represents an image display device according to the invention. This is constituted by an active matrix 1 controlled by control means 2.
  • the active matrix 1 comprises a plurality of addressing circuits 3, 4, 5, 6, each associated with a transmitter (not shown) and distributed along lines and columns.
  • the means 2 for controlling the active matrix comprise a control system 7, a selection control circuit 8 and an addressing control circuit 10.
  • the control system 7 is adapted to receive an image display signal, to process it (for example, to decode and decompress it) and to output a synchronization signal to the selection control circuit 8 and signal signals. display at the addressing control circuit 10.
  • the selection control circuit 8 is connected to a plurality of line electrodes 14, 15, each associated with a line of transmitters. Upon receipt of the synchronization signal, the circuit 8 is adapted to generate a selection pulse V select successively at each line electrode 14, to select in turn all the addressing circuits 3, 6 of this line, at a distance of scanning frequency corresponding to an image duration.
  • the selection pulse V select is a logical data selection of the transmitters.
  • the addressing control circuit 10 is connected to a plurality of column electrodes 16, 17 and a plurality of driving electrodes 18, 19, each associated with a transmitter column 21A, 21B. It comprises a plurality of addressing control units 20A, 20B, each adapted to address and supply the addressing circuits 3, 4, 5, 6 of a column 21A, 21B via an electrode 16, 17 and a control electrode 18, 19.
  • the row electrodes 14, 15, 16, 17 and control column 18, 19 respectively allow to select, address and feed a circuit of specific addressing among the set of circuits 3, 4, 5, 6 of the display device.
  • FIG. 2 represents light emitters 22, 23, 24 each associated with an addressing circuit 3, 4, 5 of a set of pixels of a column of emitters 21A as well as the addressing control unit. 20A specific to this column of transmitters 21A and the selection control circuit 8 of the addressing circuits 3, 4, 5, 6.
  • the emitters 22, 23, 24 of the display device are organic light emitting diodes. They include an anode and a cathode.
  • the structure of these diodes is "conventional", that is to say that the anodes are in a lower layer, the side of the substrate, and the cathodes in the upper layer.
  • Each transmitter constitutes a basic pixel.
  • These elementary pixels are of the same nature (emission of identical color) in the case of a monochrome screen or are structured in the form of triplets red, green and blue in the case of a color screen.
  • all emitters 22, 23, 24 of a column are associated with sub-pixels of the same color.
  • the emitters of three adjacent columns are successively associated with the colors red, green and blue.
  • the bias voltages necessary for emitters 22, 23, 24 to be traversed by a current of the same value vary according to the current-voltage characteristics of these emitters, and in particular as a function of the color of the sub-pixels associated with the emitters 22, 23, 24 of each column.
  • This circuit 3 comprises a current modulator 26, a switch 28 formed of a transistor, a storage capacitor 29 and a feed electrode 30.
  • the current modulator 26 and the switch 28 are thin film transistors (Thin Film Transistor), based on a technology using polycrystalline silicon (Poly-Si), amorphous silicon (a-Si) or Microcrystalline silicon ( ⁇ c-Si) deposited in thin layers on a glass substrate.
  • Thin Film Transistor thin film transistors
  • Such components comprise three electrodes: a drain electrode and a source electrode between which flows a modulated current called drain current, and a gate electrode to which the control voltage V c is applied.
  • the source of the modulator 26 is connected to the anode of the emitter 22, so as to connect in series the modulator 26 and the emitter 22.
  • One 31 of the ends of this series, namely here the drain of the modulator 26 is connected to the control electrode 18.
  • the gate of the modulator 26 is connected on the one hand, to a first terminal of the capacitor 29 and on the other hand, to a current passage electrode (drain or source) of the switch 28, via an electrical line 33.
  • the other current-carrying electrode (drain or source) of the switch 28 is connected to the column electrode 16.
  • the gate of the switch 28 is connected to the line electrode 14.
  • the second terminal of each capacitor 29 of all the circuits 3, 4, 5 of the column 21A is connected to the supply electrode 30.
  • the other end 32 of each modulator- transmitter namely here the cathode of the transmitter 22 is connected to a supply electrode 34.
  • the two feed electrodes 30 and 34 may be interconnected at the same potential by a driver not shown.
  • the modulator 26, shown in FIG. 2 is of type n, so that, in operation, its drain current flows between its drain and its source. Note that such a device can also be used to drive p-type TFTs, always with conventional structure diodes, as shown in FIG.
  • the capacitor 29, arranged between the gate and the source of the modulator 26, is adapted to substantially maintain a constant control voltage at the gate of the modulator 26 during a time interval corresponding to the duration of an image T1, T2 in order to maintain the brightness of the transmitter during this time.
  • the supply electrode 30 is able to provide the voltage necessary to bias the desired potential to one of the terminals of the capacitor 29, as known in the state of the art.
  • the control unit 20A is adapted to compensate, with the feedback loop described hereinafter, the trigger threshold voltage V th of each modulator 26 of the set of addressing circuits 3, 4, 5 of FIG. 21A column and to supply the transmitters 22, 23, 24 of the 21A transmitters column.
  • an operational amplifier 35 having an inverting input -, a non-inverting input + and an output.
  • the output of this amplifier 35 is connected to the column electrode 16 and its non-inverting input + is connected to the control electrode 18 supplying the transmitters of the column via their associated modulator.
  • this non-inverting input + is simultaneously connected to the anode of each emitter 22, 23, 24 of the column 21A via the modulator 26 associated therewith.
  • a feedback loop of the amplifier 35 is formed by the driving electrode 18, the end 31 of the modulator-emitter series, the modulator 26, the line 33 and the column electrode 16. each time a switch 28 of an addressing circuit 3, 4, 5 of the transmitter column 21A is closed. Note that the end 31 of the modulator-emitter series which forms part of the feedback loop corresponds, in the embodiments shown in FIGS. 2 and 10, to one of the drain or source of the modulator. of this series.
  • the amplifier 35 is able to operate in feedback and thus compensate for the trigger threshold voltage V th of each modulator 26 of the addressing circuits 3, 4, 5 of the transmitter column 21A, as will be explained. in the following description.
  • control unit 20A is suitable for addressing and supplying the emitters 22, 23, 24 of the column 21A with the driving current I.
  • This current I depends on the sum of the values of the display voltages V data 22 , V data 23 , V data 24 addressed to transmitters 22, 23, 24 of this column 21 A.
  • control current generator 36 for this purpose, it comprises a control current generator 36 and a reference voltage generator 38, respectively connected to the non-inverting input + and the inverting input - of the amplifier 35.
  • the current generator 36 is formed by a variable voltage generator 39 connected in series with a resistor 40.
  • the control electrode 18 is connected to the output of the resistor 40, at the node 42, which thus forms one of the outputs of the current generator 36.
  • the generator 39 is a variable voltage generator whose voltage varies as a function of the values of the display signal V data 22 , V data 23 intended to be addressed to the transmitters 22, 23, as will be explained in the following description.
  • the generator 38 is a generator adapted to deliver a reference voltage which is fixed during the settings of the display device and which is specific to each column.
  • a variable voltage generator it is also possible to use a variable voltage generator; the variation of the reference voltage as a function of the column of transmitters 21A addressed will be explained in the following description.
  • the output of the generator 38 is connected to the inverting input - of the amplifier 35, via, optionally, a resistor 44.
  • This resistor 44 is not absolutely necessary for the operation of the control unit 20A. It only has an advantageous function of balancing between the two inputs of the operational amplifier 35.
  • a capacitor 46 is connected between the inverting input - of the amplifier 35 and the output of this amplifier.
  • the resistor 44 and the capacitor 46 constitute a compensation network which advantageously increases the accuracy and stability of the circuit.
  • the control unit 20A also comprises data storage means 48 and a control module 50 of the generators 38 and 39.
  • the storage means 48 comprise a database 52 adapted to store on the one hand the value of the display signal V data 22 , V data 23 addressed to each transmitter 22, 23 of the column 21A during the previous period of time. T1 image and, secondly, an identification or location data of the transmitter 22, 23 to which this value has been addressed.
  • These storage means 48 also comprise a directory 54 adapted to store a reference voltage value to be associated with all the transmitters of the column 21A. This value is a function of the red, green or blue color associated with the emitters 22, 23 of the column 21A.
  • the emitters associated with different colors have different current-voltage characteristics, as can be seen in FIG. 12. Consequently, it is necessary to apply different voltages across a red emitter and across a blue emitter. to obtain the same luminance and the same value of the current passing through these emitters.
  • the reference voltage values of the directories 54 of each column are set here according to the color of the emitters of a column 21A. This operation is performed at the factory, during the settings of the display device that are performed prior to its commissioning. These reference values are set to compensate for the variations between the electrical current-voltage characteristics and / or the luminous characteristics of the different emitters of the device, as will be described later.
  • these characteristics depend mainly on the emission color of the emitters, there will be three different reference voltage values, a first value V ref.R common to all the red emitters of a first column, a second value V ref.G common to all the green emitters of a second column and a third value V ref.B common to all the blue emitters of a third column.
  • these reference voltage values are specific to each column of emitters, so as to compensate for variations in current-voltage electrical characteristics and / or light characteristics between the emitters of different columns, even when are of the same emission color.
  • a current can flow in a transmitter only if the V data display signal addressed to it is greater than the reference voltage V ref associated therewith.
  • reference voltage values as low as possible will be preferably set while adjusting the display device while achieving the desired compensations.
  • the control module 50 is connected to the storage means 48 for searching and recording information therein.
  • the module 50 is adapted to receive the display signal transmitted by the system 7 and to control the generators 38 and 39 as a function of this signal and the information stored in the storage means 48.
  • circuits 8 and 10 are adapted to address, supply and successively select all the emitters 22, 23, 24 of the matrix 1.
  • step 60 the control unit 20A and the circuit 8 control the lighting of the first transmitter 22 of column 21A.
  • This step 60 includes steps 62 to 69.
  • step 62 the circuit 8 generates a selection select pulse V 22 to the line electrode 14. This pulse, shown in FIG. 4, is adapted to close the switch 28.
  • the module 50 interrogates the directory 54 to know the reference voltage associated with the column of the transmitter 22.
  • This reference voltage is in particular a function of the color of the sub-pixels associated with the transmitters 22 , 23, 24 of this column.
  • the module 50 controls the generator 38 so that it delivers the reference voltage V ref 21A for the transmitters of the column 21A whose value is constant and equal V ref a .
  • the module 50 receives from the control system 7 the value V a of the display voltage V data 22 to be addressed to the transmitter 22 as well as the identification or the position of the addressed transmitter 22 associated with this value. Then, the module 50 stores in the database 52 this value V a and the identification of the issuer to which this value is addressed.
  • the module 50 controls the generator 39 so that it generates the value V a of the display voltage V data 22 to be addressed to the transmitter 22, as represented on FIG. Figure 6.
  • the generator 38 supplies a reference voltage V ref 21A equal to V ref a , to the inverting input - of the amplifier 35.
  • the generator 39 applies a voltage V data to the resistor 40. equal to V a , shown in FIG. 6.
  • the optional resistor 44 does not intervene in the calculation of the current, because no significant current, at least compared to the value of the driving current of I 22 , circulates in this resistance.
  • the potential difference between the inverting input - and the non-inverting input + of the amplifier 35 is canceled.
  • the voltage at the node 42 is then equal to V ref a ⁇
  • control voltage V c is a function not only of the display signal of the V data transmitter 22 and of the reference voltage V ref associated with this transmitter, but also of the trigger threshold voltage V th of the modulator 26.
  • the control voltage V c applied to the gate of the modulator 26 is adapted and modulated by the amplifier 35 to compensate for the trigger threshold voltage V th of this modulator.
  • control voltage V c at the output of the amplifier 35 is adjusted exactly to the voltage required to address the transmitter 22 with the value V a of the display voltage V data 22 and that whatever the value of the trigger threshold voltage V th of the modulator 26 and this even if it varies over time.
  • This control voltage V c is then maintained at the gate of the modulator 26 by the capacitor 29 for the rest of the image duration, whereas the switch 28 of the circuit 3 is reopened, as is known in the art. state of the art.
  • Step 70 the second emitter 23 of the column 21A is illuminated.
  • Step 70 includes steps 72 to 79.
  • step 72 the circuit 8 delivers a select select pulse 23 , as shown in FIG. 5, to the line electrode 15.
  • the module 50 determines the reference voltage V ref 21A associated with the column of the transmitter 23, by interrogating the storage means 48. As the transmitter 23 is in the same column as the emitter 22 and therefore these emitters are associated with the same color, the value V ref of this reference voltage V ref 21A is identical to the value V ref a of the reference voltage V ref 22 generated during addressing the first transmitter 22.
  • the module 50 controls the reference generator 38, so that it generates the voltage V ref a determined during the step 74.
  • the module 50 receives from the system 7 and records in the database 52, the value V b of the display voltage V data 23 to be sent to the transmitter 23 and represented on the Figure 6, and the identification or position of the addressed transmitter 23 associated with this value.
  • the module 50 adds the value V a of the display voltage V data 22 previously sent to the transmitter 22 of the same column at the value V b of the display voltage V data 23 intended to be addressed to the next transmitter 23.
  • the module 50 controls the generator 39 so that it delivers a display voltage equal to the voltage value calculated during the step 78, namely V a + V b .
  • the current I 22 (V data22 - V ref a ) / R necessary for the illumination of the transmitter 22, continues to feed the modulator 26.
  • the same control voltage V c is maintained at the gate of the modulator 26 of the first circuit 3, by the capacitor 29, and not by the amplifier 35 since the switch 28 of the circuit 3 is now open.
  • This voltage Vc controls the intensity of the current supplied to the transmitter 22 so that this intensity is equal to the intensity programmed during step 60.
  • the switch 28 of the circuit 4 has been closed in the step 72, the column electrode 16, the amplifier 35, the control electrode 18, the end 31 of the modulator-emitter series, the modulator 26 of the second circuit 4 and the line 33 of the second circuit 4 form a new loop of Again, the control voltage V c coming out of the amplifier 35 compensates, as before, the trigger threshold voltage V th of the modulator 26 of the second circuit 4.
  • step 80 comprises the steps 82 to 89.
  • the module 50 then controls the generator 39 so that it delivers a display voltage equal to the new calculated value of the sum ⁇ not V data . not .
  • a second addressing of the circuit 4 is performed in the same way. After an image duration T2, all the emitters 22, 23, 24 of the column 21A are illuminated as a function of display voltages representative of the new image data to be displayed by these emitters.
  • a value of the reference voltage V ref 22 equal to V ref a has been applied to the inverting input - of the amplifier 35 and a value of the display voltage V data 22 equal to V a has been addressed to the transmitter 22 during the image duration T1. This value of the voltage V a continues to be addressed during the new image duration T2.
  • the value of the display voltage addressed to the transmitter 23 is equal to V b during the first and previous duration T3 image ( Figure 6), then is zero during the next image duration T4.
  • this device and this display method make it possible to avoid an initialization phase prior to the programming of the addressing circuits 3, 4, 5.
  • the use of a reference voltage applied to one of the inputs of the amplifier 35 and specific to each column of transmitters, or groups of columns, as here groups of different colors advantageously allows to reduce the consumption of the display device. Indeed, if one chooses the values of the reference voltages not only so as to compensate variations variations of the electrical and / or luminous characteristics of the transmitters of different columns but also so as to obtain a mean value of reference voltage the as low as possible for each column, it is possible to shift the V data values of the display signals by a similar amount and decrease, which reduces the electrical power to be generated by the power generator 39.
  • FIG. 2 of conventional structure OLED display device it is the anode of the emitters 22, 23 which forms the interface with the active matrix 1 ("conventional" structure diodes): the drain (the typical case n) or the source (p-type case) of the modulators 26, is then connected to the control electrode 18, and the cathode of the emitters 22, 23 is connected to the electrode 34.
  • the control electrode 18 is then connected to the node 42 where join one of the outputs of the power supply means 36 and the non-inverting input + of the amplifier 35.
  • the present invention also applies to display devices with a so-called inverted structure, in which the cathode of the emitters forms the interface with the active matrix: the drain (typical case p) or the source (n-type case) of the modulators 26 is then connected to the control electrode 18, and the anode of the emitters 22, 23 is connected to the electrode 34.
  • the control electrode 18 is connected to the node 42 where one of the outputs of the supply means 36 and this time the inverting input - of the amplifier 35 are joined.
  • This circuit being much more stable than that described for the diodes with a conventional structure, advantageously no resistor 44 and no capacity 46 for balancing and / or compensation are no longer needed.
  • the display signals then correspond to negative voltages and the currents of the diodes are "pulled" from the supply electrodes 34.
  • the generator 38 is able to modify the reference voltage as a function of the aging of the emitters or to lower it in a low consumption mode.
  • a reference voltage is associated with each column of transmitters.
  • the storage means 48 comprise a database suitable for storing the values of the reference voltages to be applied to each column of transmitters.
  • the control unit 50 is able to search in this database for the value the reference voltage to be applied to the inverting input - of the amplifier 35 depending on the identification or position of the column of this transmitter.
  • the difference (V ref x - V ref y ) is preferably established so as to compensate for the differences in electrical and / or luminous characteristics of the different columns of the device. transmitters.

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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)
EP04292622A 2004-07-29 2004-11-04 Anzeigevorrichtung mit aktiver Matrix und Verfahren zur Steuerung einer solchen Vorrichtung Withdrawn EP1622120A1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2007523123A JP5153331B2 (ja) 2004-07-29 2005-07-29 アクティブマトリックス画像ディスプレイ装置及びその制御方法
PCT/FR2005/002005 WO2006018553A1 (fr) 2004-07-29 2005-07-29 Dispositif d'affichage d'images et procede de commande d'un dispositif d'affichage
KR1020077002858A KR101185897B1 (ko) 2004-07-29 2005-07-29 이미지 디스플레이 디바이스와 디스플레이 디바이스 제어 방법
EP05793298A EP1771838B1 (de) 2004-07-29 2005-07-29 Bildanzeigevorrichtung und steuerungsverfahren für die anzeigevorrichtung
DE602005024139T DE602005024139D1 (de) 2004-07-29 2005-07-29 Die anzeigevorrichtung
TW094125693A TWI426489B (zh) 2004-07-29 2005-07-29 有源矩陣影像顯示裝置及其控制方法

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FR0408417 2004-07-29

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EP1622120A1 true EP1622120A1 (de) 2006-02-01

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EP04292622A Withdrawn EP1622120A1 (de) 2004-07-29 2004-11-04 Anzeigevorrichtung mit aktiver Matrix und Verfahren zur Steuerung einer solchen Vorrichtung
EP05793298A Ceased EP1771838B1 (de) 2004-07-29 2005-07-29 Bildanzeigevorrichtung und steuerungsverfahren für die anzeigevorrichtung

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EP1863005A2 (de) * 2006-06-01 2007-12-05 Thomson Licensing Videoanzeigevorrichtung und Betriebsverfahren dafür

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WO2008073371A1 (en) * 2006-12-11 2008-06-19 Lehigh University Active matrix display and method
DE102009056319B4 (de) * 2009-12-01 2019-11-21 Universität Stuttgart Regelschaltung
WO2024108389A1 (zh) * 2022-11-22 2024-05-30 京东方科技集团股份有限公司 显示面板及显示装置

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JP2003150107A (ja) * 2001-11-09 2003-05-23 Sharp Corp 表示装置およびその駆動方法
JP4115763B2 (ja) 2002-07-10 2008-07-09 パイオニア株式会社 表示装置及び表示方法
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EP1863005A2 (de) * 2006-06-01 2007-12-05 Thomson Licensing Videoanzeigevorrichtung und Betriebsverfahren dafür
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CN101031948A (zh) 2007-09-05
WO2006018553A1 (fr) 2006-02-23
CN100476937C (zh) 2009-04-08
JP2008508547A (ja) 2008-03-21
EP1771838A1 (de) 2007-04-11
EP1771838B1 (de) 2010-10-13
TW200630945A (en) 2006-09-01
KR20070048715A (ko) 2007-05-09
TWI426489B (zh) 2014-02-11
DE602005024139D1 (de) 2010-11-25
KR101185897B1 (ko) 2012-09-25

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