WO2006018553A1 - Image display device and display device control method - Google Patents
Image display device and display device control method Download PDFInfo
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- WO2006018553A1 WO2006018553A1 PCT/FR2005/002005 FR2005002005W WO2006018553A1 WO 2006018553 A1 WO2006018553 A1 WO 2006018553A1 FR 2005002005 W FR2005002005 W FR 2005002005W WO 2006018553 A1 WO2006018553 A1 WO 2006018553A1
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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
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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
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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]
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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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- 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
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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
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
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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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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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
- G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
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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
- G09G2320/0295—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel by monitoring each display pixel
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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
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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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0693—Calibration of display systems
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
Definitions
- Image display device and method for controlling a display device are described.
- the present invention relates to a display device, a display control circuit and a method of displaying images.
- an active matrix image display device comprising:
- each emitter being able to be addressed periodically by a value of a display signal representative of a display datum of a duration of picture ;
- a current modulator connected in series to each light emitter of the network to form emitter-modulator series, said modulator comprising a source, a drain, a grid, said modulator being capable of being crossed by a drain current to supply said transmitter, for a voltage between one of the drain and the source, and the gate greater than or equal to a trigger threshold voltage of this modulator;
- Image display devices are increasingly used in all kinds of applications such as in motor vehicles, digital cameras or mobile phones. Display devices are known in which the light emitters are formed from organic electroluminescent cells such as display devices of the OLED (Organic Light Emitting Diode) type.
- OLED Organic Light Emitting Diode
- passive matrix OLED display devices are already widely marketed. However, they consume a lot of electrical energy and have a reduced lifespan.
- Active matrix OLED display devices have integrated electronics, and have many advantages such as reduced power consumption, high resolution, compatibility with video rates and longer life than OLED display devices with passive matrix.
- these display devices comprise an active matrix formed in particular by a network of light emitters.
- Each light emitter is linked to a pixel or 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 pixel or sub-pixel of the display device.
- these modulators are thin-film transistors, called TFT (Thin Film Transistor) transistors, made of poly-crystalline silicon using low-temperature poly-crystalline silicon (LTPS) technology from a silicon layer. amorphous.
- TFT Thin Film Transistor
- LTPS low-temperature poly-crystalline silicon
- this technology introduces local spatial variations in the trigger threshold voltage between these transistors. These variations are due to the fact that the grain boundaries and dimensions of the silicon grains are not sufficiently controllable during the stage of crystallization of amorphous silicon (Si-a) into polycrystalline silicon (PoIy-Si).
- the TFT transistors supplied by the same supply voltage and controlled by identical display voltages or currents generate currents of different intensities.
- the triggering threshold voltages of thin film transistors are liable to vary inhomogeneously over time. Or 1 as a transmitter emits a light intensity directly proportional to the current flowing through it, the heterogeneity of the trigger thresholds of these transistors leads to a non-uniformity in the brightness of the display device comprising such transistors. This results in differences between the luminance levels and obvious visual discomfort for the user. In order to limit this discomfort, various compensation circuits for the triggering threshold voltage have been proposed.
- document EP-1 340 019 describes a display device comprising a compensation circuit comprising an operational amplifier whose output is connected to the gate of a modulator and whose non-inverting input is successively connected to the anode of each transmitter of the same column, without passing through the modulator associated with said transmitter.
- this device is extremely complicated. In particular, it requires the control of a large number of switches.
- the object of the present invention is the implementation of a simpler display device.
- the subject of the present invention is an active matrix image display device characterized in that one of the non-inverting input and the inverting input of the operational amplifier is connected to said output.
- supply means for forming, with the gate of the modulator connected to the output of the operational amplifier, a feedback loop of the operational amplifier, when one of said transmitters is selected.
- the input of the operational amplifier is not connected to the common terminal of the transmitter-modulator series of each pixel, but to one of the ends of this series.
- the invention therefore makes it possible to directly control the supply current of the transmitters in each supply column of the transmitters, at least during the addressing phase of these transmitters.
- An advantage of the invention is that this control is carried out without measuring this current.
- Each transmitter is sent periodically to each image to be displayed, or several times for each image, depending on the display method used.
- the device comprises one or more of the following characteristics.
- One of said ends of each emitter-modulator series of said column which is connected to the output of said supply means, corresponds to the drain or to the source of said modulators.
- the output of the operational amplifier 35 then delivers a control signal V 0 which is a function of the display signal Vdata 22, Vdata 23 and the triggering threshold voltage Vm of the modulator 26 connected to the selected transmitter 22, 23, 24
- the control signal V c is suitable for charging the capacitor 30.
- One of the non-inverting input (+) and the inverting input (-) of the operational amplifier connected to the output is suitable for receiving a signal dependent on the value of the display signal intended to be addressed to a transmitter selected in said column.
- said supply means further comprise a pilot generator which is adapted to supply power and in succession successively each of the transmitters of a column by supplying a pilot signal at one of said ends of the transmitter-modulator series corresponding to said transmitter, said control signal depending on the value of the display signal intended to be addressed to a transmitter selected in said column.
- a pilot generator which is adapted to supply power and in succession successively each of the transmitters of a column by supplying a pilot signal at one of said ends of the transmitter-modulator series corresponding to said transmitter, said control signal depending on the value of the display signal intended to be addressed to a transmitter selected in said column.
- the pilot generator therefore supplies one transmitter at a time, and only during its addressing phase.
- the supply means then generally also comprise a holding generator which has the function of supplying the transmitters of the column outside of their addressing phases.
- This holding generator is generally able to supply the transmitters of all the columns, outside of their addressing phases.
- Such a device requires switching means suitable for switching the power supply of the transmitters between the pilot generator and the holding generator.
- there are therefore generally two additional switches in each addressing circuit one to connect the emitter-modulator series of this circuit to the addressing generator during the addressing phases, the other to connect this series. transmitter-modulator to the holding generator outside the addressing phases.
- the output of the control generator is connected to one of the non-inverting input (+) and the inverting input (-) of the operational amplifier. Only during the addressing of a transmitter in this column, this same output is also connected, via a closed switch for addressing, to said end of the corresponding transmitter-modulator series.
- Said pilot generator comprises a display voltage generator and a resistive element connected in series, and the voltage generator is adapted to generate a voltage dependent on the value of the display signal intended to be addressed to a transmitter selected from said column.
- This resistance may be an internal resistance in the voltage generator.
- the value of the current flowing in this resistor and therefore in this transmitter during its addressing phase is independent of the trigger threshold voltage of the modulator associated with this transmitter.
- the value of the current is then on the one hand proportional to the difference between said value of the display signal and the value of the voltage applied to the other among the non-inverting input and the inverting input of the operational amplifier. , on the other hand inversely proportional to the value of the resistance of the resistive element.
- said supply means comprise a control generator capable of supplying power and, this time, continuously all the transmitters of a column by supplying the same control signal to one of said ends of each transmitter-modulator series of a column, said control signal being a function of the sum of the values of the display signal previously addressed and being addressed to all of the transmitters in the column for a duration of picture.
- Said pilot generator comprises a display voltage generator and a resistive element connected in series, and the voltage generator is adapted to generate a voltage dependent on the sum of the values of the display signal previously addressed and being addressed to all of the transmitters in the column for an image period.
- This resistance may be an internal resistance in the voltage generator. Thanks to this series resistor, the value of the current flowing in this resistor and therefore in this transmitter is independent of the trigger threshold voltage of the modulator associated with this transmitter. The value of the current is then on the one hand proportional to the difference between said sum of the values of the display signal and the value of the voltage applied to the other among the non-inverting input and the inverting input of the operational amplifier, on the other hand inversely proportional to the value of the resistance of the resistive element.
- the addressing circuits of the transmitters are simplified compared to the first variant, since it is no longer necessary to switch one of the ends of the transmitter-modulator series alternately to two different generators as in the first variant.
- the output of the control generator is connected on the one hand to one of the non-inverting input (+) and the inverting input (-) of the operational amplifier, on the other hand, without an intermediate switch, to said end of the corresponding emitter-modulator series.
- the voltage generator is connected to the resistive element to deliver a pilot current obtained from the following relationship:
- Said control means further comprise a reference generator capable of delivering a reference signal to the other from the inverting input (-) and the non-inverting input (+) of the operational amplifier.
- Each transmitter has specific electrical and / or optical properties and the value of each reference signal is a function of said electrical and / or optical properties.
- Each transmitter is associated with the illumination of a color, and the reference signal is capable of being modulated as a function of the color assigned to said selected transmitter.
- a given white shade is conventionally identified by its trichromatic coordinates. Thanks to the invention, the chromatic performance of the device can easily be optimized and the differences in aging between the emitters can be compensated for.
- the transmitters are grouped in pluralities of adjacent transmitters adapted to each transmit a different color, and, for each plurality, said reference signals are allocated to the different transmitters of this plurality so that the addressing of these transmitters by the same display signal value generates the emission of said white hue by this plurality.
- Said control means further comprise data storage means suitable for storing the value of the display signal addressed to each transmitter for an image duration.
- the invention also relates to a method for an active matrix image display device, comprising several light emitters forming a network of emitters distributed in rows and columns, each emitter being suitable for being addressed periodically for a period of time.
- a current modulator comprising a source, a drain, a gate, one of the drain or the source of each modulator being connected in series to a transmitter of the network to form a transmitter-modulator series comprising two ends; selection means able to select the transmitters of a line; an electric charge storage capacitor capable of maintaining a control voltage at the gate of the or each modulator during said image duration; and means for controlling the illumination of the transmitters of a column comprising at least one operational amplifier having an inverting input, a non-inverting input and an output, the method comprising the following steps - Transmission by the selection means, of a selection signal (Vseiect) to a line of transmitters;
- V 0 (V 0 ) to the grid of each modulator connected to the selected transmitter; characterized in that it further comprises the following step:
- the method includes the characteristic that the control signal is a function of the sum of the values of the display signals sent to all of the transmitters of the column during an image duration.
- FIG. 1 is a block diagram of a display device according to the invention
- FIG. 2 is a block diagram of part of the display device shown in Figure 1;
- FIG. 3 is a diagram schematically showing some steps of the control method according to the invention.
- FIG. 4 is a graph showing the time evolution of a selection voltage applied to a selection electrode of a first addressing circuit of the display device according to the invention
- FIG. 5 is a graph showing the time evolution of a selection voltage applied to a selection electrode of a second addressing circuit of the display device according to the invention.
- FIG. 6 is a graph representing the time evolution of a display voltage generated by a control generator for successively addressing the different addressing circuits of the same column of the display device according to the invention, in particular the first and second circuits;
- - Figure 7 is a graph showing the time evolution of a drain current flowing in a modulator of the first addressing circuit
- - Figure 8 is a graph showing the time evolution of a drain current flowing in a modulator of the second addressing circuit of the display device according to the invention
- FIG. 9 is a graph showing the time evolution of a control current generated by a control unit of the display device according to the invention.
- FIG. 10 is a block diagram of a first alternative embodiment of the part of the display device shown in Figure 2;
- FIG. 11 is a block diagram of a second alternative embodiment of the part of the display device shown in Figure 2;
- FIG. 12 is a graph comprising curves representing the current passing through different emitters of the display device according to the invention, as a function of the voltage applied to their terminals; and
- Figure 13 is a block diagram of a third alternative embodiment of part of the display device shown in Figure 2.
- Figure 1 shows an image display device according to the invention. This consists of an active matrix 1 controlled by control means 2.
- the active matrix 1 comprises a plurality of addressing circuits 3, 4, 5, 6, each associated with a transmitter (not shown) and distributed in rows and columns.
- the means 2 for controlling the active matrix comprise a control system 7, a selection control circuit 8 and an addressing control circuit 10.
- the control system 7 is adapted to receive an image display signal, to process it (for example, to decode and decompress it) and to deliver a synchronization signal to the selection control circuit 8 and signals display to the addressing control circuit 10.
- the selection control circuit 8 is connected to a plurality of line electrodes 14, 15, each associated with a line of transmitters. Sure reception of the synchronization signal, the circuit 8 is adapted to generate a selection pulse V se ⁇ ect successively at each line electrode 14, to select in turn all of the addressing circuits 3, 6 of this line, to a scanning frequency corresponding to an image duration.
- the selection pulse V se iect is a logical datum for selecting the transmitters.
- the addressing control circuit 10 is connected to a plurality of column electrodes 16, 17 and a plurality of pilot electrodes 18, 19, each associated with a column of transmitters 21 A, 21 B. It comprises a plurality of addressing control units 20A, 20B, each suitable for addressing and supplying the addressing circuits 3, 4, 5, 6 of a column 21 A, 21 B by means of an electrode column 16, 17 and a piloting electrode 18, 19.
- the line electrodes 14, 15, column 16, 17 and control 18, 19 respectively allow to select, address and supply a specific addressing circuit among all the circuits 3, 4, 5, 6 of the display device.
- circuit 3 at the intersection of the electrode of this line 14 and electrodes 16 and 18 of this column of transmitters 21 A is activated, while none of the other circuits 4, ..., 5 of this same column is only activated.
- FIG. 2 represents light emitters 22, 23, 24 each associated with an addressing circuit 3, 4, 5 of a set of pixels of a column of emitters 21 A as well as the control unit of 2OA addressing specific to this column of transmitters 21 A and the selection control circuit 8 of the addressing circuits 3, 4, 5, 6.
- the emitters 22, 23, 24 of the display device are organic light-emitting diodes. They include an anode and a cathode.
- the structure of these diodes is “conventional”, that is to say that the anodes are in the lower layer, on the side of the substrate, and the cathodes in the upper layer.
- Each transmitter constitutes a pixel elementary. These elementary pixels are of the same nature (emission of identical color) in the case of a monochrome screen or are structured in the form of red, green and blue triplets in the case of a color screen.
- all of the emitters 22, 23, 24 of a column are associated with sub-pixels of the same color.
- the emitters of three adjacent columns are successively associated with the colors red, green and blue.
- the bias voltages necessary for emitters 22, 23, 24 to be crossed by a current of the same value vary as a function of the current-voltage characteristics of these emitters, and in particular as a function of the color of the sub-pixels associated with emitters 22, 23, 24 of each column.
- the addressing circuits 3, 4, 5 of the active matrix 1 are identical, only the circuit 3 will be described in detail.
- This circuit 3 comprises a current modulator 26, a switch 28 formed by a transistor, a storage capacitor 29 and a supply electrode 30.
- the current modulator 26 and the switch 28 are thin film transistors, based on a technology using polycrystalline silicon (PoIy-Si) 1, amorphous silicon (a-Si) or Micro-crystalline silicon ( ⁇ c-Si) deposited in thin layers on a glass substrate.
- Such components include three electrodes: a drain electrode and a source electrode between which a modulated current called the drain current flows, and a gate electrode to which the control voltage V 0 is applied.
- the source of the modulator 26 is connected to the anode of the transmitter 22, so as to connect the modulator 26 and the transmitter 22 in series.
- One end 31 of this series namely here the drain of the modulator 26 , is connected to the control electrode 18.
- the grid of the modulator 26 is connected on the one hand, to a first terminal of the capacitor 29 and on the other hand, to a current flow electrode (drain or source) of the switch 28, via an electrical line 33.
- the other current flow electrode (drain or source) of switch 28 is connected to column electrode 16.
- the grid of switch 28 is connected to line electrode 14.
- the second terminal of each capacitor 29 of all the circuits 3, 4, 5 of column 21 A is connected to the supply electrode 30.
- each series modulator-emitter namely here the cathode of the emitter 22 is connected to a supply electrode 34.
- the two supply electrodes 30 and 34 can be connected to each other at the same potential by a conductor not shown.
- the modulator 26, shown in FIG. 2 is of type n, so that, in operation, its drain current flows between its drain and its source. It will be noted that such a device can also be used to drive p-type TFTs, still with diodes of conventional structure, as illustrated in FIG. 10.
- the capacitor 29, disposed between the gate and the source of the modulator 26, is adapted to maintain substantially a constant control voltage at the gate of the modulator 26 during a time interval corresponding to the duration of an image T1, T2 in order to maintain the brightness of the transmitter during this time.
- the supply electrode 30 is capable of supplying the voltage necessary to bias one of the terminals of the capacitor 29 to the desired potential, as is known in the prior art.
- the control unit 2OA is adapted to compensate, with the feedback loop described below, the trigger threshold voltage V t h of each modulator 26 of all the addressing circuits 3, 4, 5 of column 21 A and to supply the transmitters 22, 23, 24 of the column of transmitters
- this amplifier 35 comprises an operational amplifier 35 having an inverting input -, a non-inverting input + and an output.
- the output of this amplifier 35 is connected to the column electrode 16 and its non-inverting input + is connected to the control electrode 18 ensuring the supply of the transmitters of the column via their associated modulator.
- this non-inverting input + is connected simultaneously to the anode of each transmitter 22, 23, 24 of the column 21A via the modulator 26 which is associated with it.
- a feedback loop of the amplifier 35 is formed by the control electrode 18, the end 31 of the modulator-transmitter series, the modulator 26, the line 33 and the column electrode 16 to each time a switch 28 of an addressing circuit 3, 4, 5 of the column of transmitters 21 A is closed.
- the end 31 of the modulator-transmitter series which is part of the feedback loop corresponds, in the embodiments shown in Figures 2 and 10, to one of the drain or source of the modulator in this series.
- the amplifier 35 is able to operate in feedback and thus compensate for the triggering threshold voltage Vu 1 of each modulator 26 of the addressing circuits 3, 4, 5 of the column of transmitters 21 A, as will be explained in the following description.
- control unit 2OA is capable of addressing and supplying the transmitters 22, 23, 24 of column 21A by the control current I.
- This current I depends on the sum of the values of the display voltages Vdata 22 , V da ta 23, V d ata 24 addressed to the transmitters 22, 23, 24 of this column 21 A.
- a driving current generator 36 and a reference voltage generator 38 connected respectively to the non-inverting input + and to the inverting input - of the amplifier 35.
- the current generator 36 is formed by a variable voltage generator 39 connected in series to a resistor 40.
- the control electrode 18 is connected to the output of the resistor 40, to the node 42, which therefore forms one of the outputs of the current generator 36.
- the generator 39 is a variable voltage generator, the voltage of which varies as a function of the values of the display signal Vdata 22, Vdata 2 3 intended to be addressed to the transmitters 22, 23, as will be explained in the following description.
- the generator 38 is a generator adapted to deliver a reference voltage which is fixed during the adjustments of the display device and which is specific to each column.
- a variable voltage generator it is also possible to use a variable voltage generator; the variation of the reference voltage as a function of the column of transmitters 21A addressed will be explained in the following description.
- the output of the generator 38 is connected to the inverting input - of the amplifier 35, via, optionally, a resistor 44.
- This resistor 44 is not absolutely necessary for the operation of the control unit 20A. It only has an advantageous balancing function between the two inputs of the operational amplifier 35.
- a capacitor 46 is connected between the inverting input - of the amplifier 35 and the output of this amplifier.
- the resistor 44 and the capacitor 46 constitute a compensation network which advantageously increases the precision and the stability of the circuit.
- the control unit 2OA also comprises data storage means 48 and a control module 50 for the generators 38 and 39.
- the storage means 48 comprise a database 52 suitable for storing on the one hand the value of the signal d Vd display was at 22 .
- V da ta 2 3 addressed to each transmitter 22, 23 of column 21 A during the previous image duration T1 and, on the other hand, data for identifying or locating the transmitter 22, 23 to which this value has been addressed.
- These storage means 48 also include a directory 54 adapted to store a reference voltage value to be associated with all of the transmitters in column 21A. This value is a function of the red, green or blue color associated with the transmitters 22, 23 of column 21 A.
- the transmitters associated with different colors have different current-voltage characteristics, as can be seen in FIG. 12. Consequently, it is necessary to apply different voltages across the terminals of a red transmitter and across the terminals of a blue transmitter. obtain the same luminance and the same value of the current passing through these emitters.
- the reference voltage values of the directories 54 of each column are fixed here as a function of the color of the emitters of a column 21 A. This operation is carried out in the factory, during the adjustments of the display device which are carried out prior to its commissioning. These reference values are established to compensate for the variations between the electrical current-voltage characteristics and / or the light characteristics of the various emitters of the device, as will be described later.
- these characteristics mainly depend on the emission color of the emitters, there will be three different reference voltage values, a first value V ref R common to all of the red emitters of a first column, a second value V ref . G common to all of the green transmitters in a second column and a third value V re t fB a common to all of the blue transmitters in a third column.
- these reference voltage values are specific to each column of emitters, so as to compensate for variations in the electrical current-voltage characteristics and / or light characteristics between the emitters of different columns, even when they are of the same emission color.
- a current can only flow in a transmitter if the display signal V data which is addressed to it is greater than the reference voltage V ref which is associated with it. To avoid having to use display signals of too high values, it is preferable to establish, when adjusting the display device, reference voltage values as low as possible while obtaining the desired compensations.
- the control module 50 is connected to the storage means 48 to search for and record information therein.
- the module 50 is suitable for receiving the display signal transmitted by the system 7 and for controlling the generators 38 and 39 as a function of this signal and of the information stored in the storage means 48.
- the circuits 8 and 10 are suitable for addressing, supplying and successively selecting all of the transmitters 22, 23, 24 of the matrix 1.
- control unit 2OA and the circuit 8 control the lighting of the first transmitter 22 in column 21 A.
- This step 60 includes steps 62 to 69.
- circuit 8 generates a selection pulse
- V is ie ct 22 at the line electrode 14.
- This pulse represented in FIG. 4, is suitable for closing the switch 28.
- the module 50 interrogates the directory 54 to find out the reference voltage associated with the column of the emitter 22.
- This reference voltage is in particular a function of the color of the sub pixels associated with the emitters 22, 23, 24 of this column.
- the module 50 controls the generator 38 so that the latter delivers the reference voltage V ref 21 A intended for the transmitters of column 21 A whose value is constant and equal V re f a .
- the module 50 receives from the control system 7 the value V a of the display voltage V d a t a 22 to be sent to the transmitter 22 as well as the identification or the position of the addressed transmitter 22 associated with this value. Then, the module 50 records in the database 52 this value V a and the identification of the transmitter to which this value is addressed.
- the module 50 controls the generator 39 so that the latter generates the value V 3 of the display voltage V data 22 to be addressed to the transmitter 22, as shown in Figure 6.
- the generator 38 supplies a reference voltage V ref 2 i A equal to V re fa, at the inverting input - of the amplifier 35.
- the generator 39 applies a voltage Vdata to the resistor 40 22 equal to V 3 , shown in FIG. 6.
- V a is the value of the display voltage Vdata 22 generated by the generator 39
- V r ⁇ f a is the value of the reference voltage generated by the generator 38
- R is the value of the resistor 40.
- the optional resistor 44 does not intervene in the calculation of the current, because no significant current, at least with regard to the value of the driving current of I 22 , flows in this resistance.
- the modulator 26 of circuit 3 connected in series to the first transmitter 22 operates in its saturation mode (V gs - V th ⁇ V dS )
- the drain current passing through it is equal to the pilot current I and the following relationship is checked: ) 2
- Vg 5 is the voltage between the gate and the source of the modulator 26
- k is a constant which depends on the intrinsic characteristics of the modulator 26
- V m is the trigger threshold voltage of the modulator 26
- Vd S is the voltage between the drain and the source of the modulator 26.
- a value V gs is automatically deduced from the value of the control voltage V c .
- the value of the control voltage V c is a function not only of the display signal of the transmitter Vdata 2 2 and of the reference voltage V re f a associated with this transmitter, but also of the triggering threshold voltage V t h of the modulator 26.
- the control voltage V c applied to the gate of the modulator 26 is adapted and modulated by the amplifier 35 to compensate for the triggering threshold voltage V t h of this modulator.
- control voltage V 0 at the output of the amplifier 35 adjusts exactly to the voltage necessary to address the transmitter 22 with the value V 3 of the display voltage V d ata 2 2 and what that the value of the triggering threshold voltage V t h of the modulator 26 is this, even if this varies over time.
- Step 70 the second transmitter 23 of the column 21A is illuminated. Step 70 includes steps 72 to 79.
- the circuit 8 delivers a selection pulse V se iect23, as shown in FIG. 5, to the line electrode 15.
- the module 50 determines the reference voltage V re f 21A associated with the column of the transmitter 23, by interrogating the storage means 48. As the transmitter 23 is in the same column as the emitter 22 and that consequently these emitters are associated with the same color, the value V r ⁇ f a of this reference voltage V r ⁇ f 2-IA is identical to the value V re fa of the reference voltage V re f 22 generated when addressing the first transmitter 22.
- the module 50 controls the reference generator 38, so that the latter generates the voltage V ref a , determined during step 74.
- the module 50 receives from the system 7 and stores in the database 52, the value V b of the display voltage V d a ta 23 to be sent to the transmitter 23 and shown in FIG. 6, as well as the identification or the position of the addressed transmitter 23 associated with this value.
- the module 50 adds the value V a of the display voltage Vd a ta 22 previously addressed to the transmitter 22 of the same column to the value V b of the display voltage V d ata 23 intended to be addressed to the next transmitter 23. Then, during a step 79, the module 50 controls the generator
- the current I22 (Vd ata 22 - V ref a ) / R necessary for the illumination of the transmitter 22, continues to supply the modulator 26.
- the same control voltage V c is maintained at the gate of the modulator 26 of the first circuit 3, by the capacitor 29, and not by the amplifier 35 since the switch 28 of the circuit 3 is now open.
- This voltage V c controls the intensity of the current supplying the transmitter 22 so that this intensity is equal to the intensity programmed during step 60.
- the remaining current I - I22 V data2 3 / R on the control electrode 18 supplies the modulator 26 of the second circuit 4.
- the switch 28 of circuit 4 was closed during step 72, the column electrode 16 , the amplifier 35, the control electrode 18, the end 31 of the modulator-transmitter series, the modulator 26 of the second circuit 4 and the line 33 of the second circuit 4 form a new feedback loop of the amplifier 35. Consequently, the control voltage V c leaving the amplifier 35 compensates as before the trigger threshold voltage V th of the modulator 26 of the second circuit 4.
- the method of addressing the display device continues by addressing all of the transmitters 22, 23, 24 of column 21 A during the same first image frame of duration T1, by carrying out steps similar to steps 72 to 79, for each addressing circuit 3, 4, 5 of column 21A.
- the database 52 then contains the p values V data n of display voltage addressed to each emitter of the column
- pilot current I passing through the pilot electrode 18 is then defined by the following general relation:
- I is the piloting current generated by the piloting unit 2OA and flowing in the piloting electrode 18;
- I n is the current flowing in the transmitter n
- V dat an is the value of the image display voltage addressed to the transmitter n;
- V ref 2 i A is the value of the reference voltage associated with the transmitters in column 21 A; and p is the number of transmitters in column 21 A.
- Steps 82, 84, 86, 87, 88 and 89 are respectively identical to steps 62, 64, 66, 68 and 69 and will not be described again.
- these steps are adapted so that the module 50: - receives from the database 52 the value V a of the display voltage Vdata 22 previously addressed to the transmitter 22 during the frame of previous image and receives from system 7 and stores in database 52 the new value V 3 of the display voltage V'd at a 22 to be sent to the transmitter 22, in place of the old value V a - subtract the old value V a from the sum] T Vdata.n and add the new value V ' a to it .
- the module 50 then controls the generator 39 so that the latter delivers a display voltage equal to the new calculated value of the sum
- circuit 4 A second addressing of circuit 4 is carried out in the same way.
- a value of the reference voltage V ref 22 equal to V r ⁇ f was applied to the inverting input - of the amplifier 35 and a value of the display voltage Vdata 22 equal to V 3 was addressed to the transmitter 22 during the image duration T1. This value of the voltage V 3 continues to be addressed during the new image duration T2.
- the second image duration T2 and the charges stored by the capacitor 29 of the circuit 3 during the previous image duration T1 are not modified.
- the value of the display voltage addressed to the transmitter 23 is equal to Vb during the first and previous duration d image T3 (FIG. 6), then is zero during the following image duration T4.
- this device and this display method make it possible to avoid an initialization phase prior to the programming of the addressing circuits 3, 4, 5.
- the use of a reference voltage applied to one of the inputs of the amplifier 35 and specific to each column of transmitters, or to groups of columns as here groups of different colors advantageously makes it possible to reduce the consumption of the display device.
- the values of the reference voltages are chosen not only so as to compensate for the variations the variations in the electrical and / or light characteristics of the emitters of different columns but also so as to obtain an average value of reference voltage la as low as possible for each column, the data V values of the display signals can be shifted by as much and reduced, which reduces the electrical power to be generated by the power generator 39.
- FIG. 2 of an OLED display device with a conventional structure it is the anode of the emitters 22, 23 which forms the interface with the active matrix 1 (diodes with “classic” structure): the drain ( typical case n) or the source (typical case p) of the modulators 26, is then connected to the pilot electrode 18, and the cathode of the emitters 22, 23 is connected to the electrode 34.
- the pilot electrode 18 is then connected to node 42 where one of the outputs of the supply means 36 and the non-inverting input + of the amplifier 35 meet.
- the present invention also applies to display devices with a so-called inverted structure, in which the cathode of the emitters forms the interface with the active matrix: the drain (typical case p) or the source (typical case n) of the modulators 26 is then connected to the control electrode 18, and the anode of the transmitters 22, 23 is connected to the electrode 34.
- the control electrode 18 is connected to the node 42 where meet one of the outputs of the supply means 36 and, this time, the inverting input - of the amplifier 35.
- This circuit being much more stable than that which has been described for the diodes with conventional structure, advantageously, no resistor 44 nor any capacity 46 for balancing and / or compensation is no longer necessary.
- the display signals then correspond to negative voltages and the currents of the diodes are "drawn" from the supply electrodes 34.
- the generator 38 is able to modify the reference voltage as a function of the aging of the transmitters or to lower it in a low consumption mode.
- a reference voltage is associated with each column of transmitters.
- the storage means 48 comprise a database capable of storing the values of the reference voltages to be applied to each column of transmitters.
- the control unit 50 is capable of searching in this database for the value of the reference voltage to be applied to the inverting input - of the amplifier 35 as a function of the identification or of the position of the column of this transmitter.
- the difference is then preferably established (V ref x - V ref y ) so as to compensate for the differences in electrical and / or light characteristics of the different columns d 'transmitters.
- FIG. 13 Part of a display device according to a third embodiment of the invention is illustrated in FIG. 13.
- This display device comprises addressing circuits 103 connected, on the one hand, to 2OA addressing control units by electrodes of column 16 and control electrodes 18 and, on the other hand, to a selection circuit 8 by line electrodes 14.
- the circuit 103 is suitable for addressing and supplying a transmitter 22, the cathode of which is connected to a supply electrode 34. It comprises a current modulator 26, three switches 28, 106,
- the drain of the modulator 26 is connected to the anode of the emitter 22, so as to connect the modulator 26 and the emitter 22 in series.
- the gate of the modulator 26 is connected, on the one hand, to a first terminal of the capacitor
- the other current passage electrode (drain or source) of the switch 28 is connected to the column electrode 16.
- the grid of the switch 28 is connected to the line electrode 14.
- the second terminal of the capacitor 29 is connected to the ground electrode 110.
- the source of the modulator 26 is connected, on the one hand, to the drain of the switch
- the switch 108 and, on the other hand, to a current flow electrode (drain or source) of the switch 106.
- the source of the switch 108 is connected to the ground electrode 110.
- the grid of the switch 108 is connected to the line electrode 14.
- the other current flow electrode (drain or source) of the switch 106 is connected to the control electrode 18.
- the grid of the switch 106 is connected to the line electrode 14.
- the 2OA control unit has been partially represented. It has the same components as the control unit shown in Figure 2 and operates in the same way.
- the control electrode 18 is connected to the inverting input of the operational amplifier 35 and to the resistor 40.
- the column electrode 16 is connected to the output of the operational amplifier 35.
- the control unit 2OA is adapted to supply successively power and discontinuously each of the transmitters 22 of the addressing circuits 103 of a column 21 A by supplying a current I 21 to one end of the series of transmitters 22 - modulators 26.
- the non-inverting input of the operational amplifier 35 is suitable for receiving a reference voltage intended for the emitters 22 of column 21 A and whose value is a function of the color of the sub-pixels associated with the emitters 22 of this column.
- the display voltage Vdata to be sent to the transmitter 22 is applied to the resistor 40. This voltage generates a pilot current which is applied to the current-passing electrode of the switch 106.
- the line electrode 14 is set to a logic state O, so that the switches 28 and 106 are closed and the switch 108 is open.
- the trigger threshold voltage of the gate of the modulator 26 is compensated by the amplifier 35 operating in feedback and this independently of the characteristics of the modulator 26.
- the voltage at the gate of the modulator 26 is stored in the capacitor 29.
- the line electrode 14 changes to a logic state 1 and, consequently, the switches 28 and 106 are open and the switch 108 is closed.
- the voltages at the drain, source and gate electrodes of the modulator 26 have not varied during the passage from the refresh phase to the storage phase, so that the same current flows through the emitter 22 during the passage from the refresh phase to the memorization phase.
- this device makes it possible to finely control the current passing through the transmitter 22, which generates a precise grid scale, uniform brightness and low noise even on high resolution screens.
- the programming time of this display device is reduced compared to display devices without feedback.
- this display device allows significant dispersions on the characteristics and in particular on the trigger threshold voltage of the modulator 26.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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DE602005024139T DE602005024139D1 (en) | 2004-07-29 | 2005-07-29 | THE DISPLAY DEVICE |
KR1020077002858A KR101185897B1 (en) | 2004-07-29 | 2005-07-29 | Image display device and display device control method |
EP05793298A EP1771838B1 (en) | 2004-07-29 | 2005-07-29 | Image display device and display device control method |
JP2007523123A JP5153331B2 (en) | 2004-07-29 | 2005-07-29 | Active matrix image display device and control method thereof |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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FR0408417 | 2004-07-29 | ||
FR0408417 | 2004-07-29 | ||
EP04292622A EP1622120A1 (en) | 2004-07-29 | 2004-11-04 | Active matrix display device and method of driving such a device |
EP04292622.0 | 2004-11-04 |
Publications (1)
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WO2006018553A1 true WO2006018553A1 (en) | 2006-02-23 |
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PCT/FR2005/002005 WO2006018553A1 (en) | 2004-07-29 | 2005-07-29 | Image display device and display device control method |
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EP (2) | EP1622120A1 (en) |
JP (1) | JP5153331B2 (en) |
KR (1) | KR101185897B1 (en) |
CN (1) | CN100476937C (en) |
DE (1) | DE602005024139D1 (en) |
TW (1) | TWI426489B (en) |
WO (1) | WO2006018553A1 (en) |
Cited By (1)
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JP2010512557A (en) * | 2006-12-11 | 2010-04-22 | リーハイ・ユニバーシティー | Active matrix display and method thereof |
Families Citing this family (3)
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EP1863005B1 (en) * | 2006-06-01 | 2010-08-04 | Thomson Licensing | Video display device and operating method therefore |
EP1863001A1 (en) | 2006-06-01 | 2007-12-05 | Thomson Licensing | Video display device and operating method therefore |
DE102009056319B4 (en) * | 2009-12-01 | 2019-11-21 | Universität Stuttgart | control circuit |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5886474A (en) * | 1995-10-13 | 1999-03-23 | Sony Corporation | Luminescent device having drive-current controlled pixels and method therefor |
US20030107534A1 (en) * | 2000-10-27 | 2003-06-12 | Semiconductor Energy Laboratory Co., Ltd. | Display device and method of driving the same |
EP1381019A1 (en) | 2002-07-10 | 2004-01-14 | Pioneer Corporation | Automatic luminance adjustment device and method |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003043993A (en) * | 2001-07-27 | 2003-02-14 | Canon Inc | Active matrix type display |
JP3800050B2 (en) * | 2001-08-09 | 2006-07-19 | 日本電気株式会社 | Display device drive circuit |
JP2003076331A (en) * | 2001-08-31 | 2003-03-14 | Seiko Epson Corp | Display device and electronic equipment |
JP2003150107A (en) * | 2001-11-09 | 2003-05-23 | Sharp Corp | Display device and its driving method |
DE10254511B4 (en) * | 2002-11-22 | 2008-06-05 | Universität Stuttgart | Active matrix driving circuit |
EP1624358B1 (en) * | 2003-05-14 | 2015-03-11 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device |
WO2005029456A1 (en) * | 2003-09-23 | 2005-03-31 | Ignis Innovation Inc. | Circuit and method for driving an array of light emitting pixels |
JP2005331933A (en) * | 2004-04-20 | 2005-12-02 | Dainippon Printing Co Ltd | Organic el display |
-
2004
- 2004-11-04 EP EP04292622A patent/EP1622120A1/en not_active Withdrawn
-
2005
- 2005-07-29 WO PCT/FR2005/002005 patent/WO2006018553A1/en active Application Filing
- 2005-07-29 DE DE602005024139T patent/DE602005024139D1/en active Active
- 2005-07-29 EP EP05793298A patent/EP1771838B1/en not_active Expired - Fee Related
- 2005-07-29 CN CNB2005800328782A patent/CN100476937C/en not_active Expired - Fee Related
- 2005-07-29 TW TW094125693A patent/TWI426489B/en not_active IP Right Cessation
- 2005-07-29 KR KR1020077002858A patent/KR101185897B1/en active IP Right Grant
- 2005-07-29 JP JP2007523123A patent/JP5153331B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5886474A (en) * | 1995-10-13 | 1999-03-23 | Sony Corporation | Luminescent device having drive-current controlled pixels and method therefor |
US6177767B1 (en) * | 1995-10-13 | 2001-01-23 | Sony Corporation | Luminescent device having drive-current controlled pixels and method therefor |
US20030107534A1 (en) * | 2000-10-27 | 2003-06-12 | Semiconductor Energy Laboratory Co., Ltd. | Display device and method of driving the same |
EP1381019A1 (en) | 2002-07-10 | 2004-01-14 | Pioneer Corporation | Automatic luminance adjustment device and method |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010512557A (en) * | 2006-12-11 | 2010-04-22 | リーハイ・ユニバーシティー | Active matrix display and method thereof |
Also Published As
Publication number | Publication date |
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KR20070048715A (en) | 2007-05-09 |
JP2008508547A (en) | 2008-03-21 |
CN101031948A (en) | 2007-09-05 |
TW200630945A (en) | 2006-09-01 |
TWI426489B (en) | 2014-02-11 |
KR101185897B1 (en) | 2012-09-25 |
EP1771838A1 (en) | 2007-04-11 |
JP5153331B2 (en) | 2013-02-27 |
EP1771838B1 (en) | 2010-10-13 |
DE602005024139D1 (en) | 2010-11-25 |
CN100476937C (en) | 2009-04-08 |
EP1622120A1 (en) | 2006-02-01 |
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