EP1697920A1 - Dispositif d'affichage d'images a matrice active - Google Patents
Dispositif d'affichage d'images a matrice activeInfo
- Publication number
- EP1697920A1 EP1697920A1 EP04816458A EP04816458A EP1697920A1 EP 1697920 A1 EP1697920 A1 EP 1697920A1 EP 04816458 A EP04816458 A EP 04816458A EP 04816458 A EP04816458 A EP 04816458A EP 1697920 A1 EP1697920 A1 EP 1697920A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- modulator
- transmitters
- current
- voltage
- column
- 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
Links
Classifications
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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
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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
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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]
- G09G3/3275—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
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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]
- G09G3/3275—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
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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
- 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
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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
- 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
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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
- 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
- G09G2300/088—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 using a non-linear two-terminal element
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0248—Precharge or discharge of column electrodes before or after applying exact column voltages
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
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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
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
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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
- 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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
Definitions
- the present invention relates to an active matrix image display device.
- Flat screens are increasingly used in all kinds of applications such as in motor 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 consumption, high resolution, compatibility with video rates and a longer lifespan than passive matrix OLED displays.
- the display devices comprise a display panel formed in particular by a network of light emitters.
- Each light emitter is linked to a pixel or a sub-pixel of an image to be displayed and is addressed by a network of column electrodes and row electrodes via an addressing circuit.
- the addressing circuits notably include current modulators able to control the current passing through the emitters and therefore the luminance of each sub-pixel of the display panel.
- these modulators are thin-film transistors, called TFT (Thin Film Transistor) transistors, made of crystalline poly-silicon using low-temperature poly crystalline silicon (LTPS) technology.
- TFT Thin Film Transistor
- the TFT transistors composing the same display panel have different trigger threshold voltages. Consequently, the TFT transistors supplied by the same supply voltage and controlled by identical voltages or data currents generate currents of different intensity.
- the heterogeneity of the trigger thresholds of the crystalline poly-Silicon transistors leads to a non-uniformity of brightness of a screen formed by a matrix of such transistors. This results in differences between the luminance levels and obvious visual discomfort for the user.
- a control circuit of an emitter comprising a comparison unit capable of comparing the drain current l d through the modulator at a reference current during a programming step of the control circuit.
- this circuit requires the installation of a transmitter switching unit to switch the power source of the transmitter between the programming step and a step of transmitting end frame of the transmitter.
- This switching unit includes two thin film transistors and an inverting amplifier. This circuit is difficult to manufacture and not very economical. It is known in particular from document EP 1 381 019 active matrix display devices comprising OLED transmitters, means for supplying the transmitters, modulators and means for compensating for the trigger threshold voltages of the modulators.
- the compensation means comprise means for comparing the drain current passing through a selected transmitter with a display setpoint.
- the transmitters are not supplied by the same supply means both during the programming phases and the successive transmission phases for displaying the images, which requires a specific electrode network for each supply mode.
- a display device comprising OLED transmitters, means for supplying the transmitters, modulators and means for compensating the voltages of modulator trigger threshold.
- the transmitters are supplied by the same supply means both during the programming phases and the successive transmission phases for displaying the images, but the compensation of the threshold voltages is carried out during a phase of calibration before displaying images.
- the compensation means comprise means for measuring the drain current passing through a selected transmitter and means for comparing this drain current with a calibration instruction for this transmitter. These compensation means therefore do not make it possible to compensate for variations in trigger threshold voltages which would appear during the display phase of the images. It is known in particular from the document JP-2002/091377, US-2003/001832 and W0-2004 / 034364, active matrix display devices comprising OLED transmitters, modulators and means for compensating threshold voltage of triggering of the modulators.
- the compensation means include means for measuring the drain current passing through a selected transmitter and means for comparing this drain current with a display setpoint. However, the means for measuring the drain current are specific to each emitter of a column.
- 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; - Power supply means capable of simultaneously supplying current to all of the transmitters of a column, during an emission step and a step of programming the emitters; means for controlling the emission of the transmitters comprising: for each transmitter of the network, a current modulator comprising a source electrode, a drain electrode, a gate electrode, said modulator being capable of being traversed by a current of drain for supplying said transmitter, for a voltage between the drain or the source and the gate greater than or equal to a trigger threshold voltage; for each column of transmitters, column addressing means capable of successively addressing each transmitter of said column of transmitters by applying a value representative of a data setpoint to the gate electrode of the modulator associated with this transmitter, for controlling it, during a programming step, - for each line of transmitters, line selection means capable of successively selecting the transmitters of each line of transmitters, during the programming step,
- the display device includes one or more of the following characteristics: - the power supply means of the transmitters are directly connected to each modulator of the control means; the power supply means of the transmitters are directly connected to each transmitter of a column; the power supply means of the transmitters comprise a voltage supply generator capable of supplying all the transmitters of a column, and the compensation means are capable of successively compensating the trigger threshold voltage of each modulator of all the transmitters in a column; - the compensation means further comprise: - a control generator capable of generating a control signal applied to the gate of said modulator; means for modulating the duration of said control signal as a function of the value of the data setpoint and the value of the triggering threshold voltage; the data setpoint is a data voltage and the comparison means are capable of emitting a warning signal when the voltage representative of the intensity of the drain current is equal to a number of times said data voltage; the means for modulating the duration of the piloting signal comprise: a switch connected in series with the piloting generator; - A control unit
- FIG. 1 is a block diagram of a control and supply circuit of a transmitter according to the invention
- - Figure 2 is a block diagram of an exemplary embodiment of a current measurement unit according to the invention
- - Figures 3A to 3D are graphs representing the evolution over time of different voltages and currents during the process performed by the device according to the invention; in particular - FIG.
- FIG. 1 represents an active matrix display device according to the invention. Such a device comprises a plurality of light emitters 2 forming an array of rows and columns, power supply means V dd of the emitters 2 and control means 3 for emitting the emitters. However, for the sake of simplification, a single emitter and a single supply means have been shown in FIG. 1.
- the emitters 2 of the display panel are organic light emitting diodes. They include an anode and a cathode. They are each associated with a pixel when the panel is monochrome or with a sub-pixel when the display panel is polychrome. They emit a light intensity directly proportional to the current flowing through them.
- the power supply means V dd of the emitters 2 comprise a DC voltage generator per column of emitters 2. This generator V dd supplies a line 4, to which all of the emitters 2 of this column are connected.
- the control means 3 of the display device comprise an addressing circuit 6 for each transmitter, a network of selection electrodes 8 for row and addressing 10 for column and means for compensating 12 for the threshold for triggering the modulators.
- An addressing circuit 6 is connected to each transmitter 2 of the display panel.
- the addressing circuit shown in Figure 1 is a conventional structure circuit.
- the anode of the transmitter forms the interface with the active matrix and the cathode of the transmitter is connected to a ground electrode or to a negative voltage.
- the addressing circuit 6 comprises a current modulator 14, a switch 16 and a storage capacity 18.
- the current modulator 14 is a transistor based on a technology using polycrystalline silicon (Poly-Si) or amorphous silicon (a-Si) deposited in thin layers on a glass substrate.
- Such components include three electrodes: a drain electrode and a source electrode between which the modulated current flows, and a gate electrode to which an Idata data driving current is applied.
- Thin Film Transistor English are of type n or p.
- the modulator 14 shown in FIG. 1 is of the p type. Its source is connected directly to the supply electrode V dd and its drain is connected directly to the anode of the transmitter 2 so that in operation the modulated electric current flows between the source and the drain. Alternatively, when the modulator 14 is of type n, the drain is connected to the supply electrode V d and the modulated electric current then flows between the drain and the source.
- the power supply generator V dd is directly connected to all of the modulators 14 for controlling the transmitters of a column, so that it is always capable of supplying a transmitter 2 selected and addressed whatever the stage of the process of transmitting an image frame.
- Vdd- Switch 16 is also a transistor based on technology using polycrystalline silicon (Poly-Si) or amorphous silicon (a-Si) deposited in thin layers.
- One of its electrodes (drain or source) is connected to the addressing electrode 10 and the other electrode (drain or source) is connected to the grid of the modulator 14. Its grid is connected to the line selection electrode 8.
- the storage capacity 18 is arranged between the grid and the source of the modulator 14 to maintain the brightness of the transmitter 2 for an image frame duration. This capacity is adapted to substantially maintain the constant voltage on the grid of the modulator 14 during a time interval corresponding to the frame duration.
- the array of selection 8 and addressing 10 electrodes makes it possible to select and address a specific transmitter from all of the transmitters of the display panel.
- Each selection electrode 8 is connected to the gate of the switches 16 of one line and is adapted to transmit a selection voltage V IECT to all the emitters 2 from this line.
- the selection voltage V se ie c t is a logic datum for selecting the transmitters.
- Each addressing electrode 10 is connected to the source or to the drain of the switches 16 of a column and is capable of addressing a data driving current I da ta to the gate of the modulator 14 of all the addressing circuits 6 of this column as a function of a data setpoint U c . In the embodiment of the invention shown in FIG.
- the intensity of current flowing through the transmitter is proportional to the amplitude of the current I d ata which is applied to the electrode 10.
- the selection electrodes 8 and addressing 10 are each controlled by a corresponding control pilot 20, 22 to apply selection voltages V se ie c t and data set points U c to the transmitters.
- V se ie c t selection voltages
- U c data set points
- the means for compensating for the trigger thresholds 12 are capable of compensating for the trigger threshold voltages Vt n of all of the modulators 14 addressed by the addressing electrode 10 of this column. They include an external controller 24 per column of transmitters. This controller comprises a measurement unit 26, a comparison unit 28, a pilot generator 30, a switch 32, a control unit 34 and means 36 for initializing the addressing circuits 6 of this column.
- the measurement unit 26 is connected to the power supply electrode 4 of all the transmitters of a column.
- the measurement unit 26 is able to measure a value representative of the drain current I d of a modulator 14 selected by the selection electrode 8 and to the grid of which a pilot current Idata is applied.
- the comparison unit 28 comprises two input terminals suitable for receiving the data setpoint U c addressed by the control pilot 22 and a value representative of the drain current I d measured by the measurement unit 26.
- the data setpoint U c is a data voltage.
- the unit of comparison 28 is suitable for comparing the amplitude of the voltage representative of the drain current I d and the amplitude of the data voltage U c during a so-called programming step C of the addressing circuit 6.
- the unit of comparison 28 includes an output terminal capable of emitting a warning signal S when the amplitude of the voltage representative of the intensity of the drain current I d and the amplitude of the data voltage U c are linked by a coefficient k of predetermined proportionality.
- the warning signal S is a logic signal sent to the control unit 34.
- the data setpoint is a digital data or a data intensity.
- the pilot generator 30 is a direct current generator capable of supplying a pilot current I d at a which is a function of the data set point Uc applied to this generator.
- the switch 32 is connected in series at the output of the pilot generator 30. It is able to switch between a closed position in which the pilot current l da ta supplies the addressing electrode 10 of all the circuits addressing 6 of the column and an open position in which the addressing circuits 6 are not addressed.
- the control unit 34 is connected to the pilot 22, to the output of the comparison module 28 and to the switch 32 to receive the data voltage U c and the warning signal S and to control the switching of the switch 32.
- the control unit 34 is able to command the closing of the switch 32 on reception of the data voltage U c and the opening of the latter on reception of the warning signal S.
- the duration of the control current I d ata generated is modulated as a function of the triggering threshold voltage V tr ⁇ specific to each modulator 14 as will be explained below.
- the initialization means 36 of the addressing circuits 6 are connected in parallel to the generator 30 so that the image of a frame is not influenced by the image of the previous frame. They are capable of emitting a square voltage to discharge the storage capacity 18 and a parasitic capacity induced by the display panel. They include a generator 38 of DC voltage and a switch 40. The switch 40 is connected to the control unit 34.
- FIG. 2 represents an exemplary embodiment of a unit 26 for measuring a representative value of the drain current I d passing through the modulator 14 of the control circuit for which the programming step begins.
- a measurement unit 26 is connected to the supply line 4 of the transmitters 2 of a column. It comprises a block 41 for determining the drain current I d , a low-pass filter 42, a differential block 43 and an amplifier 44.
- the determination block 41 comprises a resistor 45, for example from 1 to 10 kilos Ohms, connected in series at line 4 supplying transmitters and an operational amplifier 46 of precision whose terminals are connected to the supply line 4 on either side of the resistor 45.
- the output of the amplifier 46 is connected on the one hand to the low-pass filter 42 , itself connected to a negative terminal of an amplifier 47 of the differential block 43 and on the other hand to a positive terminal of this amplifier 47.
- the differential block 43 comprises an amplifier 47 in a differential circuit and a network of four resistors of the same value.
- a first resistor R1 is connected between the positive input of the amplifier 47 and a ground electrode.
- a second resistor R2 is connected between the positive input of the amplifier 47 and the output of the amplifier 46.
- a third resistor is connected between the negative input of the amplifier 47 and the output of the low-pass filter 42.
- a fourth resistor R4 is connected between the negative input of the amplifier 47 and its output terminal.
- the output of the differential block 43 is connected to an amplifier 44 having a high gain.
- the determination block 41 is capable of measuring the total current supplying all of the emitters of a column, including the drain current passing through the modulator 14 during the programming of the latter. This drain current then appears at the terminals of the resistor 45 in the form of a current pulse.
- the output voltage of the determination block 41 is proportional to the total current passing through the line 4. This voltage is applied to the terminals of the low-pass filter 42 which eliminates the high frequency component therefrom.
- This high frequency component corresponds to the current pulse generated by the modulator 14 supplied by the line 4 and which is during a programming step.
- the amplifier 47 of the differential unit receives at its negative input a voltage proportional to the total supply current of line 4, except the component corresponding to the drain current passing through the modulator 14 and, on its positive input a voltage proportional to the total current on line 4.
- the output voltage V d it f of the differential block 43 is equal to the resistor 45 multiplied by the drain current of the modulator 14 which is at during a programming stage.
- This voltage is amplified by amplifier 44 then is compared with the data voltage U c in the comparison block 28 as explained above.
- the image display device is a voltage control circuit of the modulators.
- the DC generator 30 is then replaced by a voltage supply generator and preferably by a ramp voltage generator.
- the amplitude of the ramp voltage is modulated as a function of the value of the amplitude of the data setpoint, emitted by the column control pilot 22.
- the duration of the ramp voltage addressed to the addressing circuits 6 is also modulated as a function of the triggering threshold voltage Vt n , by the comparison means 28 and the control unit 34.
- the four graphs of FIGS. 3A to 3D represent the steps of addressing a transmitter when it is produced by the display device according to the invention.
- stages include a stage A of initialization of an addressing circuit 6, an intermediate stage B, a stage C of programming of this one and a stage D of emission of light proportional to the pilot current I d ata previously program.
- the line control pilot 20 applies a voltage V se i e c t to the electrode 8 of the selected line. This voltage is applied to the grid of the switches 16, connected to the line electrode 8.
- the control unit 34 of the external controller 24 of a column controls the closing of the switch 40 and a voltage Vj n jt generated by the generator 38, is applied to the addressing electrode 10 of this column.
- the voltage Vjni t is applied to a terminal of the storage capacity 18 to discharge it, the switch 16 being closed.
- Step B is short-lived and has the sole function of creating a dead time to separate the initialization and programming steps in order to avoid short circuits.
- the column control pilot 22 transmits a data voltage U c
- the control unit 34 commands the closing of the switch 32 and the pilot generator 30 generates a pilot current I d at a -
- the current I data generates a potential difference between the gate and the source of the modulator 14
- Vt h of the modulator 14 When this potential difference is greater than the triggering threshold voltage Vt h of the modulator 14, a drain current I d is established between the drain and the source of the modulator.
- the intensity of this drain current I which corresponds to part of the current flowing in line 4, is measured by the measurement unit 26 and a voltage representative of this drain current is compared to the data voltage U c addressed by the pilot 22.
- the amplitude of the intensity of this current is compared to the intensity of the drain current.
- the drain current generated passes through the emitter 2 which lights up.
- the generator V dd supplies power to the transmitter 2.
- the comparison unit 28 compares the data voltage U c to the voltage representative of the amplitude of the drain current I d .
- the amplitude of the drain current increases quadratic as a function of the voltage between the gate and the source of the modulator.
- the driving current I da t generated by the generator 30 causes an accumulation of charges in the storage capacitor 18 connected to the gate of the modulator 14. This accumulation of charges causes increased voltage V gs between the gate and the source of the modulator 14 and consequently, the progressive increase of the drain current Id.
- the comparison unit 28 sends a warning signal S to the control unit 34 which in turn commands the closing of the switch 32.
- the programming step is finished. The duration of the programming step is variable and depends on the triggering threshold of each current modulator in the column.
- the addressing signal of each transmitter is therefore modulated in duration as a function of the triggering threshold voltages.
- the current I data is of the order of a few microamps so that the storage capacity 18 and the parasitic capacities generated by the structure of the display panel are quickly charged.
- the programming time is short, approximately of the order of a few microseconds ( ⁇ s).
- Step C the storage capacity 18 has been sufficiently charged so that the transmitter 2 continues to transmit after its addressing for the duration of the image frame, while always being supplied from the generator V d d-
- the means for compensating the trigger threshold 12 are able to modulate the duration of the control signal I d ata in turn for each modulator of the column of transmitters.
- Step D begins at the end of the programming step and ends at the end of the selection of line 8.
- step D the transmitter 2 is still selected but its programming is finished; it continues to transmit as a function of this programming thanks to the voltage stored across the terminals of the capacitor 28.
- the drain current I d continues to cross the modulator 14 and the transmitter 2 until the voltage across the storage capacity 18 is discharged during a new step A of initialization of this addressing circuit.
- step C of programming an addressing circuit 6 associated with a first transmitter 2 the control pilots 20, 22 and the compensation means 12 are used for the programming of another circuit of addressing associated with a second transmitter in the same column.
- the first transmitter 2 continues to transmit.
- FIG. 4 represents an alternative embodiment of the invention in which the control means 3 are identical to those shown in FIG. 1.
- the addressing circuit 6 driving a light emitter 2 with conventional structure is replaced by a addressing circuit 66 driving a light emitter with a so-called inverted structure.
- the cathode of the emitters 52 forms the interface with the active matrix and the anode of the emitters 52 is connected to the power supply generator V dd -
- the source of the modulator 54 is connected to a ground or to a negative voltage generator.
- the cathode of the emitter 52 is connected to the drain of the modulator 54.
- the storage capacity 58 is connected between the grid and the source of the modulator 54.
- a switch 56 is addressed in current I da t a by an addressing electrode 60 and is selected by a selection electrode 68.
- the power supply generator V dd is directly connected to all the transmitters 52 of all the columns without the interposition of a switching unit. Consequently, this generator V dd supplies power to all the transmitters 52 during the programming step C and during the step D throughout the duration of the image frame. Consequently, it is the power supply means V ss which are connected separately to the compensation means 12.
- each power supply generator V ss is capable of supplying all of the emitters 2 of a column and since each addressing electrode 60 is also capable of addressing all of the emitters 2 of a column, the means compensation 12 are able to successively compensate the trigger threshold voltage V th of all the modulators 14 of a column. Furthermore, as the compensation means 12 determine the duration of the signal before each frame, the variations in the triggering threshold linked to the aging of the modulators are automatically compensated.
- no switching unit is interposed between the generator V d or V ss and the modulator 14 or the transmitter 52 to switch between two power sources of the transmitter during the programming and transmission process of this one.
- the useful light-emitting area of the pixels is increased.
- the control means are simplified and their implementation is facilitated.
- the means for compensating all the columns compensate for the dispersions of the triggering threshold voltages of the modulators of control circuits of an active matrix screen.
- the unit 26 for measuring the current passing through a modulator during a programming step C makes it possible to dispense with a switching unit associated with each transmitter.
- the intensity of the driving current I ata is high, the stray capacitances generated by the addressing column of the display panel are quickly loaded. As a result, the display device is addressed instantly.
Landscapes
- 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)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0315295 | 2003-12-23 | ||
PCT/FR2004/003328 WO2005071649A1 (fr) | 2003-12-23 | 2004-12-21 | Dispositif d'affichage d'images a matrice active |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1697920A1 true EP1697920A1 (fr) | 2006-09-06 |
EP1697920B1 EP1697920B1 (fr) | 2009-10-14 |
Family
ID=34803296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04816458A Not-in-force EP1697920B1 (fr) | 2003-12-23 | 2004-12-21 | Dispositif d'affichage d'images a matrice active oled |
Country Status (9)
Country | Link |
---|---|
US (1) | US8610651B2 (fr) |
EP (1) | EP1697920B1 (fr) |
JP (1) | JP2007515688A (fr) |
KR (1) | KR20060123355A (fr) |
CN (1) | CN1898719B (fr) |
AT (1) | ATE445895T1 (fr) |
DE (1) | DE602004023649D1 (fr) |
MX (1) | MXPA06007060A (fr) |
WO (1) | WO2005071649A1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1863005B1 (fr) * | 2006-06-01 | 2010-08-04 | Thomson Licensing | Dispositif d'affichage vidéo et son procédé de fonctionnement |
EP1863001A1 (fr) | 2006-06-01 | 2007-12-05 | Thomson Licensing | Dispositif d'affichage vidéo et procédé de fonctionnement correspondant |
JP5240538B2 (ja) * | 2006-11-15 | 2013-07-17 | カシオ計算機株式会社 | 表示駆動装置及びその駆動方法、並びに、表示装置及びその駆動方法 |
US8026873B2 (en) * | 2007-12-21 | 2011-09-27 | Global Oled Technology Llc | Electroluminescent display compensated analog transistor drive signal |
JP5107824B2 (ja) * | 2008-08-18 | 2012-12-26 | 富士フイルム株式会社 | 表示装置およびその駆動制御方法 |
US8194063B2 (en) * | 2009-03-04 | 2012-06-05 | Global Oled Technology Llc | Electroluminescent display compensated drive signal |
CN102364568B (zh) * | 2011-06-27 | 2013-11-06 | 昆山工研院新型平板显示技术中心有限公司 | Amoled的像素单元电路及有机发光显示装置 |
US10847979B2 (en) * | 2018-12-14 | 2020-11-24 | Zhuhai Jieli Technology Co., Ltd | Charging and communication system |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3308880B2 (ja) * | 1997-11-07 | 2002-07-29 | キヤノン株式会社 | 液晶表示装置と投写型液晶表示装置 |
JP2001147659A (ja) * | 1999-11-18 | 2001-05-29 | Sony Corp | 表示装置 |
JP3688564B2 (ja) * | 2000-07-24 | 2005-08-31 | 株式会社神戸製鋼所 | 化学爆弾解体設備 |
JP2002091377A (ja) * | 2000-09-11 | 2002-03-27 | Hitachi Ltd | 有機elディスプレイ装置 |
TW561445B (en) * | 2001-01-02 | 2003-11-11 | Chi Mei Optoelectronics Corp | OLED active driving system with current feedback |
KR100370095B1 (ko) * | 2001-01-05 | 2003-02-05 | 엘지전자 주식회사 | 표시 소자의 액티브 매트릭스 방식의 구동 회로 |
JP2002278513A (ja) * | 2001-03-19 | 2002-09-27 | Sharp Corp | 電気光学装置 |
US7224333B2 (en) * | 2002-01-18 | 2007-05-29 | Semiconductor Energy Laboratory Co. Ltd. | Display device and driving method thereof |
-
2004
- 2004-12-21 DE DE602004023649T patent/DE602004023649D1/de active Active
- 2004-12-21 US US10/583,924 patent/US8610651B2/en active Active
- 2004-12-21 JP JP2006546244A patent/JP2007515688A/ja not_active Withdrawn
- 2004-12-21 AT AT04816458T patent/ATE445895T1/de not_active IP Right Cessation
- 2004-12-21 MX MXPA06007060A patent/MXPA06007060A/es unknown
- 2004-12-21 KR KR1020067012207A patent/KR20060123355A/ko not_active Application Discontinuation
- 2004-12-21 EP EP04816458A patent/EP1697920B1/fr not_active Not-in-force
- 2004-12-21 CN CN2004800387343A patent/CN1898719B/zh not_active Expired - Fee Related
- 2004-12-21 WO PCT/FR2004/003328 patent/WO2005071649A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2005071649A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005071649A1 (fr) | 2005-08-04 |
US20080272993A1 (en) | 2008-11-06 |
DE602004023649D1 (de) | 2009-11-26 |
CN1898719B (zh) | 2010-04-21 |
KR20060123355A (ko) | 2006-12-01 |
MXPA06007060A (es) | 2006-09-04 |
US8610651B2 (en) | 2013-12-17 |
JP2007515688A (ja) | 2007-06-14 |
CN1898719A (zh) | 2007-01-17 |
ATE445895T1 (de) | 2009-10-15 |
EP1697920B1 (fr) | 2009-10-14 |
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