EP1644913A1 - Display-baustein und steuerschaltung für einen lichtmodulator - Google Patents

Display-baustein und steuerschaltung für einen lichtmodulator

Info

Publication number
EP1644913A1
EP1644913A1 EP04767476A EP04767476A EP1644913A1 EP 1644913 A1 EP1644913 A1 EP 1644913A1 EP 04767476 A EP04767476 A EP 04767476A EP 04767476 A EP04767476 A EP 04767476A EP 1644913 A1 EP1644913 A1 EP 1644913A1
Authority
EP
European Patent Office
Prior art keywords
modulator
operational amplifier
threshold voltage
display device
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.)
Granted
Application number
EP04767476A
Other languages
English (en)
French (fr)
Other versions
EP1644913B1 (de
Inventor
Philippe Le Roy
Christophe Prat
Christophe Fery
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.)
THOMSON LICENSING
Original Assignee
Thomson Licensing SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Publication of EP1644913A1 publication Critical patent/EP1644913A1/de
Application granted granted Critical
Publication of EP1644913B1 publication Critical patent/EP1644913B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

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    • 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
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    • 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
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    • 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
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    • 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
    • G09G3/3258—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 voltage across 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
    • 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
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G09G2300/0417—Special arrangements specific to the use of low carrier mobility technology
    • 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
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0465—Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
    • G—PHYSICS
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    • G09G2300/00—Aspects of the constitution of display devices
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    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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    • G—PHYSICS
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    • G—PHYSICS
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    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
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    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2011—Display of intermediate tones by amplitude modulation

Definitions

  • the present invention relates to an active matrix image display device.
  • Flat image display screens are increasingly used in all kinds of applications such as in vehicle display devices, digital cameras or mobile phones.
  • Displays are known in which light emitters are formed from organic electroluminescent cells such as OLED (Organic Light Emitting Diodes) displays.
  • OLED Organic Light Emitting Diodes
  • passive matrix OLED type displays are already widely marketed. However, they consume a lot of electrical energy and have a reduced lifespan.
  • Active matrix OLED displays have integrated electronics, and have many advantages such as reduced power consumption, high resolution, compatibility with video rates and a longer lifespan than passive matrix OLED displays.
  • active matrix display devices comprise a display panel formed in particular by a network of light emitters.
  • FIG. 1 represents a light emitter E, hereinafter designated emitter, and the addressing circuit associated therewith. More specifically, it is a voltage addressing circuit.
  • an addressing circuit of this type comprises control means and means for supplying the transmitter. It is controlled by a network of row and column electrodes. These electrodes make it possible to select and then address a specific emitter E from all of the emitters of the display panel.
  • the transmitter addressing means include a control switch 11, a storage capacity C and a current modulator M.
  • the modulator M converts a data control voltage of a pixel or a sub-pixel into an electric current passing through it.
  • the modulator M is a transistor component of the MOSFET n or p type. Such components include three terminals: a drain and a source between which the modulated current flows, and a gate to which the control voltage is applied.
  • the modulator is of type n as in FIG. 1, the modulated electric current flows between the drain and the source, when it is of type p, the modulated electric current flows between the source and the drain.
  • the modulator M is connected in series with the transmitter. The two terminals of this series are connected to supply means, the anode terminal to a supply electrode Vdd and the cathode terminal generally to an electrode connected to ground.
  • FIG. 1 of OLED displays with conventional structure it is the anode of the emitters which forms the interface with the active matrix: the drain (case type n) or the source (case type p) of the modulators is then connected to the supply electrode Vdd, and the cathode of the emitters is connected to the ground electrode.
  • the emitter cathode which forms the interface with the active matrix the source (type n case) or the drain (p type case) of the modulators is then connected to the ground electrode, and the emitter anode is connected to the supply electrode Vdd.
  • a video data voltage Vdata is applied to the gate of the modulator M.
  • this modulator generates a current of drain which conventionally varies according to a quadratic function of the potential difference applied between the grid and the source of the modulator.
  • the light emitters of the panel being arranged in rows and columns, all of the control switches 11 of the emitters of the same line are controlled by a so-called line electrode and all of the data signal inputs video of the control switches 11 of the transmitters of the same column are supplied by a so-called column electrode.
  • a control voltage is applied to the line electrode Vselect connected to the grid of the control switch 11 of this emitter to select it.
  • the addressing means of a light emitter comprise a storage capacity C connected between the grid of the modulator and the supply voltage Vdd applied to this transmitter via the modulator.
  • This storage capacity C stores the voltage applied to the grid of the modulator so that the light energy of the transmitter is kept approximately constant for the duration of the frame of the image, even when the control switch of this transmitter n 'is no longer closed and the corresponding line is no longer selected.
  • the control switch 11 as well as the modulator M are thin film transistors, also called TFT (Thin Film Transistor) transistors.
  • LTPS low-temperature polycrystalline silicon
  • the drain current Id represents the variations of the drain current Id as a function of the applied voltage Vgs between the gate and the source of different thin film transistors in crystalline poly-Silicon.
  • the triggering threshold voltage Vth of these transistors is variable from one transistor to another and, presents a dispersion of values due to the faults caused by the variations induced by the crystallization process of the transistors.
  • the voltage Vgs between the source and the gate of the modulator must be greater than the triggering threshold voltage of the modulator Vth, constituted by one of the abovementioned transistors.
  • the drain current passing through such thin film transistors varies as a function of the triggering threshold voltage of these transistors.
  • a thin film transistor when a thin film transistor operates in saturation mode, it functions as a current generator.
  • the drain current varies from one transistor to another depending on the triggering threshold voltage of each transistor.
  • the modulators M of crystalline poly-silicon composing the same display panel and supplied with the same supply voltage Vdd will generate currents of different intensity, even when these are controlled by data voltages Vdata identical.
  • an emitter E generally emits a light intensity directly proportional to the current flowing through it, so that the heterogeneity of the trigger thresholds of the crystalline poly-silicon transistors leads to a non-uniformity of brightness of a screen constituted by a matrix of such tran- sistors. This results in differences between the luminance levels and obvious visual discomfort for the user. In order to limit this discomfort, various circuits for compensating for the variation in the triggering threshold voltage have been proposed.
  • a first method consists in reducing the degradation of the luminance levels by modifying the structures of the pixels.
  • this method consumes energy and requires a rapid addressing circuit.
  • Another method described in the document, "Sony, A 13-inch AMOLED display - SID Digest, 2001”, consists in current programming of pixel structures. This addressing mode compensates for both the variations in mobility of the charge carriers and therefore of the threshold.
  • current programming must take into account very low current levels for low luminance, which leads to considerably increasing the programming time necessary to establish the adequate current supplied to the OLED light emitter.
  • each addressing circuit produced according to this method, requires the installation of four TFT thin film transistors per transmitter.
  • the triggering threshold voltage of the first additional transistor automatically compensates for the triggering voltage of the modulator so that the drain current, supplying the transmitter, is independent of the triggering voltage.
  • the second thin-film transistor also makes it possible to reset the voltage stored in the load capacity.
  • the addressing circuit according to this method also requires the creation of an addressing circuit with 4 transistors. This greater complexity reduces both the reliability and the yield of the screens, leading to a significant increase in manufacturing costs. Another method described in document EP1381019, in particular in paragraphs 42 and 43 with reference to FIGS.
  • the voltage control method described here uses an operational amplifier 54 to compensate for the trigger threshold variations of all the modulators 32 relating to the same column of pixels; the output of this amplifier is connected, via the switch SW2a and the electrode Xi, to the gate G of the modulator 32; the non-inverting input (+) of this amplifier is connected, via the resistor 52, the switch SW1a and the electrode Wi, to the drain electrode D of this modulator 32.
  • the present invention relates to an active matrix image display device comprising: - several light emitters forming a network of emitters distributed in rows and columns, - means for controlling the emission network light emitters comprising: - for each network light emitter, a current modulator capable of controlling said emitter, and comprising a source electrode, a drain electrode, a gate electrode and a trigger threshold voltage ; the triggering threshold voltage varying from one modulator to another, - column addressing means capable of addressing the emitters of each column of emitters by applying a data voltage to the electrode of grid of their modulators, for controlling them, - line selection means capable of selecting the transmitters of each line of transmitters by applying a selection voltage, - means of compensating the trigger threshold voltage of each modulator, characterized in that: - the compensation means comprise at least one operational amplifier, the feedback of this operational amplifier being able to compensate the triggering threshold voltage of at least one modulator whatever the value of that here, and - said amplifier having an inverting input (-), a non-
  • the display device comprises one or more of the following characteristics: the control means comprise, for said modulator associated with a transmitter, at least one first control switch connected between the output the operational amplifier and the gate electrode of said modulator; the first switch comprising a gate electrode capable of receiving the line selection voltage of this transmitter; and the control means comprise, for said modulator associated with a transmitter, a second control switch connected between the inverting terminal of the operational amplifier and the source electrode of the modulator; the second switch comprising a gate electrode connected to the gate electrode of said first switch to receive, in synchronism, the selection voltage; and the line selection means are capable of supplying a gate electrode with at least one of said first switches to select at least one transmitter for this line; and the compensation means comprise an operational amplifier able to compensate the trigger threshold voltage of all the modulators controlling the transmitters of a column; and - the modulators, the first and the second control switches are components made from poly-crystalline silicon in thin layers or from amorphous silicon in thin layers; and - the modulators are n-
  • each addressing circuit of a light emitter only comprises three thin film transistors.
  • This image display device is therefore simpler to manufacture and occupies a smaller useful surface area of the pixel which leads to obtaining a larger aperture ratio of said pixel.
  • its manufacture is more economical because it requires less silicon. Indeed, considering the number of transmitters forming a display panel, the economy of one transistor per transmitter represents a substantial saving by increasing the manufacturing yield.
  • Another object of this invention is to provide a control circuit for a current modulator which can, for example, be used in an active matrix image display device.
  • the invention provides a control circuit for a current modulator having an indefinite trigger threshold voltage, the circuit comprising means for compensating the trigger threshold voltage, characterized in that the means for compensating of the trigger threshold voltage comprise at least one operational amplifier connected between a gate electrode and a source electrode of said modulator, and the feedback of which compensates for the trigger threshold voltage of the modulator so that the intensity of the current drain through the modulator is independent of the trigger threshold voltage of the modulator.
  • the output of this operational amplifier is connected to the gate electrode of the modulator and its inverting input (-) is connected to the source electrode of this same modulator.
  • FIG. 1 is a block diagram of an addressing circuit d 'a light emitter known from the prior art
  • FIG. 2 is a graph representing curves of the current-voltage characteristic of different thin film transistors manufactured by the technique, known as such, of crystallization of low-temperature poly-crystalline silicon (LTPS)
  • - Figure 3 is a block diagram of a first embodiment of the present invention in which the current modulator of the addressing circuit is of type n
  • - Figure 4 is a block diagram of a second embodiment of the present invention in which the current modulator of the addressing circuit is of type p
  • - Figure 5 is a block diagram of part of a network of transmitters according to the first embodiment of the invention.
  • FIG. 3 represents an element of an image display device according to a first embodiment of the present invention.
  • This element comprises a light emitter E as well as the addressing circuit 10 which is associated with it.
  • this addressing circuit 10 comprises a current modulator M, a first control switch 11, a storage capacity C, a line selection electrode Vselect, a column addressing electrode Vdata and a supply electrode in voltage Vdd.
  • the modulator is of the n type and the emitter is an OLED type diode with a so-called conventional structure.
  • the same circuit is also applicable to OLED displays with an inverted structure, provided that p-type modulators are used and the modulator-emitter series is inverted, that is, the anode of the emitters is connected to the electrode of Vdd supply and the drain of the modulators to the ground electrode.
  • Another circuit will be presented later with reference to FIG. 4 suitable for the use of a p-type modulator with a conventional OLED structure, also applicable to an n-type modulator with an inverted OLED structure.
  • a power source Vdd is connected to the drain of the modulator M.
  • a setpoint current also called drain current, is established between the drain and the source and feeds the anode of the light emitter E.
  • the intensity of this drain current is a function, among other things, of the triggering threshold voltage Vth of the modulating transistor.
  • the light emitter E emits an amount of light proportional to this current. The same data voltage therefore does not generate the same amount of light from one emitter to another.
  • the addressing circuit according to the present invention comprises an operational amplifier 11, which compensates for the triggering threshold voltage Vth of the current modulators M. En practical, the column addressing electrode is here connected to the non-inverting input (+) of the operational amplifier 11.
  • the source of the modulator M is connected to the inverting terminal (-) of the operational amplifier, and the output terminal of the operational amplifier 11 is connected to the gate of the modulator M to unlock it by application of the control voltage.
  • a selection switch 11 is connected in series between the gate of the modulator M and the output terminal of the operational amplifier 11 and a switch 12 is connected in series between the source of the modulator and the inverting terminal (-) of the operational amplifier, and the controls of these switches 11, 12 are connected to the same line selection electrode Vselect.
  • the feedback thus obtained from the operational amplifier advantageously compensates for the trigger threshold voltage Vth of the modulator M, and this whatever the value thereof.
  • the voltage of the anode of the transmitter E is equal to the data voltage of column Vdata and, the drain current emitted by the modulator and passing through the transmitter is independent of the trigger threshold voltage Vth of the modulator M.
  • the voltage between the gate and the source which is generated by the operational amplifier compensates for the threshold voltage of the modulator M, whatever its value.
  • a current generator controlled by the data voltage Vdata on the basis of an equivalent diode charge, which is not fixed.
  • the application of a feedback of the trigger threshold voltage is synchronous with the application of the data control voltage Vdata and the selection control voltage Vse- lect.
  • this addressing circuit also comprises a first control switch 11 the opening and closing of which are controlled by the line control electrode.
  • This first switch 11 is connected between the output of the operational amplifier 11 and the gate of the current modulator M so as to control the unlocking of the latter.
  • a scanning control voltage Vselect is applied to the gate of the first switch 11, the latter closes and the output voltage of the operational amplifier is applied to the gate of the modulator.
  • the addressing circuit can also include an additional switch 12 connected between the source of the modulator M and the inverting terminal (-) of the operational amplifier 11 to allow the latter to operate in feedback.
  • this second switch can also be controlled by the scanning voltage Vselect applied to the line selection electrode.
  • the gate of the second switch 12 is connected to the gate of the first switch 11 and the second switch receives the scanning control voltage Vselect in synchronism with the first switch 11.
  • This second switch 12 secures the addressing of 'an emitter. It prevents the possible occurrence of leakage current in another addressing circuit located on the same column as the selected transmitter.
  • the two switches 11, 12 and the modulator M are manufactured using TFT technology. These thin film transistors can be made of amorphous silicon or polycrystalline silicon.
  • the addressing structure with three TFT components and an operational amplifier is compatible with these two technologies for manufacturing TFT components.
  • the addressing circuit comprises a storage capacity C arranged between the grid of the modulator M and its source.
  • the addressing circuit can also include a compensation capacitor Ce mounted in parallel, via the first and second control switches 11 and 12, with the charging capacitance C, to stabilize the circuit.
  • the modulator M After scanning the pixels, the modulator M operates in the saturation region and delivers a drain current proportional to the voltage stored in the storage capacity C. Due to the voltage compensation produced by the operational amplifier, the drain current is independent of the trigger threshold voltage Vth of the modulator M. Thus, the pixel-to-pixel threshold voltage variations of the same column do not influence the current flowing through l emitter of these pixels.
  • Figure 4 shows a second embodiment of the present invention.
  • the modulator is this time of type p and the transmitter is an OLED type diode with a so-called conventional structure.
  • the same circuit is also applicable to OLED displays with an inverted structure, provided that n-type modulators are used and the modulator-emitter series is inverted, that is, the anode of the emitters is connected to the electrode of Vdd power supply and the source of the modulators to the ground electrode via a passive component.
  • the operational amplifier 21 is used in feedback. Its output is connected as previously to the grid of the modulator M via an inter- control breaker 11, and its inverting input (-) is connected as previously to the source of the modulator M via a control switch 12.
  • the data control voltage Vdata is injected into the input non-inverting (+) amplifier.
  • the supply voltage Vdd of the transmitter is here connected to the source of the modulator M via a passive component R.
  • the drain of the here the modulator is connected to the anode of the light emitter E.
  • a drain current here flows through the modulator, from its source to its drain.
  • This passive component can, for example, include an electrode, a resistor, a diode or an electrical circuit. In the exemplary embodiment of FIG. 4, this passive component advantageously consists of a resistor R with thin layers.
  • a data voltage Vdata is applied to the gate of the modulator M and therefore to the terminal common to the resistor R and to the source of the modulator, and a drain current flows through the modulator M and the emitter E
  • the drain current is directly controllable by the data voltage Vdata.
  • the drain current is therefore constant.
  • the drain current Id is constant (cf. equation 1), the difference between the threshold trigger voltage Vth and the voltage between the gate and the source is therefore constant.
  • the threshold trigger voltage Vth and the voltage between the gate and the source are constantly adjusted to each other.
  • FIG. 5 schematically represents part of a network of transmitters of an active matrix display panel in which the modulators of the addressing circuits are n-type components.
  • the network of transmitters and their addressing circuit are arranged in rows and columns.
  • the application of a scanning voltage Vselect n on the electrode of line n controls all of the first 11 and second 12 switches for controlling the pixels of this line.
  • Video data voltages, Vdata i, Vdata j corresponding to the images to be displayed supply the operational amplifiers of the columns via the column electrodes.
  • the network of transmitters comprises only one operational amplifier per column.
  • This operational amplifier Aj n is able to compensate for the different triggering threshold voltages of each of the modulators M ⁇ n , Mj m of this column.
  • the operational amplifiers A in , A jn of the different columns of the display panel will simultaneously compensate the triggering threshold voltages of all the modulators of this line.
  • the output of the operational amplifier of a column is connected to the gate of each of the modulators of this column, via the first control switches 11.
  • the inverting input (-) of the operational amplifier of this column is connected to the source of each of the modulators in this column, via the second control switches 12.
  • a selection voltage Vselect n is applied to the line electrode of line n of this emitter Ej n and, to obtain the desired remission, a data voltage Vdata i is then applied to the electrode from column i to the column of this transmitter E ⁇ n .
  • the first 11 and second 12 control switches being closed, as explained above, the data control voltage Vdata i is applied to the source of the modulator M in .
  • the trigger threshold voltage of this modulator is compensated by the output of the column amplifier A in , and the modulator Mj n emits a drain current in the transmitter E in .
  • the panel or network of transmitters has only one operational amplifier per column for compensating for threshold variations, and since each pixel of this panel only comprises three transistors, an economical panel is obtained offering very homogeneous levels of luminance and very good visual comfort.

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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)
EP04767476.7A 2003-07-03 2004-06-25 Anzeigegeräte und steuerschaltung für einen lichtmodulator Expired - Lifetime EP1644913B1 (de)

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FR0308127A FR2857146A1 (fr) 2003-07-03 2003-07-03 Dispositif d'affichage d'images a matrice active
PCT/FR2004/001629 WO2005013250A1 (fr) 2003-07-03 2004-06-25 Dispositif d'affichage et circuit de commande d’un modulateur de lumiere

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EP1644913B1 (de) 2013-08-07
JP2012230392A (ja) 2012-11-22
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US20070057874A1 (en) 2007-03-15
WO2005013250A1 (fr) 2005-02-10
CN100433109C (zh) 2008-11-12
KR101391813B1 (ko) 2014-05-07
JP2007516454A (ja) 2007-06-21
CN1816837A (zh) 2006-08-09
JP5688051B2 (ja) 2015-03-25
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MXPA05014178A (es) 2006-07-03
TW200505268A (en) 2005-02-01
US7557778B2 (en) 2009-07-07

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