TWI407826B - Light-emtting device, display device, and method for controlling driving of the light-emitting device - Google Patents

Light-emtting device, display device, and method for controlling driving of the light-emitting device Download PDF

Info

Publication number
TWI407826B
TWI407826B TW98110355A TW98110355A TWI407826B TW I407826 B TWI407826 B TW I407826B TW 98110355 A TW98110355 A TW 98110355A TW 98110355 A TW98110355 A TW 98110355A TW I407826 B TWI407826 B TW I407826B
Authority
TW
Taiwan
Prior art keywords
light
voltage
current
pixels
data
Prior art date
Application number
TW98110355A
Other languages
Chinese (zh)
Other versions
TW200950576A (en
Inventor
Yasushi Mizutani
Kazunori Morimoto
Tsuyoshi Ozaki
Original Assignee
Casio Computer Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2008091882 priority Critical
Priority to JP2008092020A priority patent/JP4877261B2/en
Priority to JP2009038663A priority patent/JP4816744B2/en
Application filed by Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Publication of TW200950576A publication Critical patent/TW200950576A/en
Application granted granted Critical
Publication of TWI407826B publication Critical patent/TWI407826B/en

Links

Abstract

A light-emitting device comprises a power supply line, at least one data line, at least one pixel having a light-emitting element with one end electrically connected to the power supply line and another end set to a prescribed potential, and a first transistor connecting the data line(s) and one end of the light-emitting element, a current supplying circuit that outputs a verification current of a preset value, and a data driver unit having voltage measuring circuits that acquire a voltage of the one end of the light-emitting element as the verification voltage when the verification current flows via a current path of the data line and the first transistor of the pixel, from the one end of the light-emitting element to the other end from the current supplying circuit via the power supply line.

Description

Light-emitting device, display device, and driving control method of the same

The present invention relates to a light-emitting device, a display device, and a drive control method for the light-emitting device, and more particularly to a light-emitting device including a light-emitting element for a pixel, a display device including the light-emitting device, and a drive control method for the light-emitting device.

Conventionally, a light-emitting device or a light-emitting element type display (display device) using the light-emitting device for display is known, and the light-emitting device is a pixel, and as an optical element, has, for example, an organic electroluminescence element, an inorganic electroluminescence element, or In a light-emitting element such as an LED, each pixel is arranged in a row or matrix (row and column), and the light-emitting elements of each pixel emit light.

In particular, an active matrix driving type light-emitting element type display has advantages in terms of high brightness, high contrast, high definition, low power consumption, and the like, and in particular, an organic electroluminescence element is attracting attention.

As a display device (light-emitting device) having such an organic electroluminescence device as a pixel, in order to obtain the luminance of the supplied image data by controlling the current to the organic electroluminescence device, a plurality of transistors are used. The organic electroluminescent element is driven (for example, Japanese Laid-Open Patent Publication No. 2002-156923).

The display device is controlled to write a data (gate voltage) according to the brightness of the supplied image data between the gate and the source of the transistor for controlling the current to the organic electroluminescent element. The organic electroluminescent element is caused to emit light at this luminance.

When an organic electroluminescence device is continuously operated to cause a current to flow and emit light, the resistance value thereof gradually increases, and the luminous efficiency gradually decreases. However, in the above display device, the voltage between both ends of the organic electroluminescence device cannot be measured, and it is difficult to detect the change in characteristics of the organic electroluminescence device. Therefore, the drive control corresponding to the change in the characteristics of the organic electroluminescence element cannot be performed.

The present invention has been made in view of such conventional problems, and an advantage thereof is to provide a light-emitting device, a display device, and a drive control method for a light-emitting device that can perform drive control in consideration of variations in characteristics of the organic electroluminescence device.

Further, an advantage of the present invention is to provide a light-emitting device, a display device, and a drive control method for a light-emitting device that can be driven in consideration of variations in characteristics of the organic electroluminescence device.

In order to achieve this advantage, the light-emitting device of the present invention has the following components: a power supply line; at least one data line; at least one pixel having a light-emitting element, one end of which is electrically connected to the power line, and the other end is set a predetermined potential; and a first transistor connecting the data line to one end of the light-emitting element; and a current supply circuit for outputting a detection current of a preset current value; The data driving unit includes a voltage measuring circuit that obtains the detection current from the current supply circuit via the power supply line via the data line and the current path of the first transistor of the pixel, and then from the one end of the light emitting element The voltage at the one end of the light-emitting element when the other end flows is used as the detection voltage.

The data driving unit includes: a correction circuit that corrects driving data corresponding to image data supplied from the outside based on the detection voltage obtained by the voltage measuring circuit; and the driving signal supply circuit is corrected according to The drive data generates a drive signal.

The correction circuit includes a light-emitting efficiency extraction unit having a memory circuit that pre-stores a relationship between luminous efficiency and voltage, and the luminous efficiency indicates that the detection current has a corresponding light-emitting element when the light-emitting element flows. a brightness ratio of the initial brightness at the beginning of the characteristic, the voltage is a voltage between the two ends of the light-emitting element when the detecting current flows, and the light-emitting efficiency and the light-emitting element are stored according to the memory circuit a relationship between the voltages of the terminals, and a value of the luminous efficiency corresponding to the detection voltage measured by the voltage measuring circuit; and an operation unit based on the value of the luminous efficiency extracted by the luminous efficiency extracting portion The driving data is calculated and the driving data is corrected.

The light-emitting device has a light-emitting region in which a plurality of the pixels are arranged; the voltage measuring circuit of the data driving portion is controlled to obtain the detected voltage of one of the pixels of the plurality of pixels corresponding to the light-emitting region.

The pixel is arranged in the light-emitting region, and has a plurality of pixels arranged along the column direction and the row direction; The data line is provided with a plurality of strips along the row direction of the light-emitting area; the light-emitting device has a plurality of selection lines, and the light-emitting area is orthogonal to the data lines and arranged in the column direction. And connecting the pixels; and selecting a driving unit, applying a selection signal to each of the selection lines, and setting each pixel corresponding to each of the selection lines to a selected state; wherein each pixel is associated with each of the data lines The intersections of the selection lines are arranged in an array shape, and have: a second transistor, one end of the current path is connected to the power line, and the other end of the current path is connected to one end of the light emitting element, and the power line and the One end of the light emitting element is electrically connected; and the voltage holding portion holds a voltage between the control terminal of the second transistor and the other end of the current path; the drive signal supply circuit is configured to cause the detection current to flow before the light emitting element And applying the first write voltage as the drive signal to the one pixel that obtains the detection voltage in the column in which the selection drive unit is in the selected state, and has a current value that is greater than the detection current. The current flows in the current path of the second transistor, and the second transistor is turned on, and the detection voltage is obtained by the selected drive unit in the selected state. The pixel other than one pixel applies a second write voltage as the drive signal, and has a voltage value in which the second transistor is in a non-conducting state.

Each of the pixels has a third transistor, one end of the current path is connected to the power line, and the other end of the current path is connected to the control terminal of the second transistor; the plurality of selection lines have: a first selection line, The control terminals of the third transistor of the respective pixels are connected to each other, and a plurality of rows are arranged in the column direction; and the second selection line is connected to the control terminals of the first transistor of the pixels, and is arranged in the column direction. The selection drive unit includes: a first selection drive unit that applies a first selection signal to each of the first selection lines; and a second selection drive unit that applies a second selection signal to each of the second selection lines The first transistor and the third transistor system are individually set to be in an on state by the first selection drive unit and the second selection drive unit.

Each of the pixels has a third transistor, one end of the current path is connected to the power line, and the other end of the current path is connected to the control terminal of the second transistor; the plurality of selection lines have: a first selection line, The control terminals of the first transistor of each pixel are connected, and a plurality of rows are arranged in the column direction; and the second selection line is connected to the control terminals of the third transistor of each pixel, and is arranged in the column direction. The selection drive unit includes: a first selection drive unit that applies a first selection signal to each of the first selection lines; and a second selection drive unit that is configured by a switch circuit and a switch drive circuit. The switching circuit includes a plurality of switching elements that apply a second selection signal according to the first selection signal to each of the second selection lines, and the switch driving circuit controls the operation of the transistors of the switching circuit; The transistor and the third transistor system are individually set to be in an on state by the first selection drive unit and the second selection drive unit.

The switch circuit includes a plurality of first switching elements, which are provided corresponding to the respective columns of the light-emitting regions, and one end of the current path is connected to the second selection line, and the other end of the current path is set to a predetermined potential; a plurality of second switching elements are provided corresponding to the respective columns of the light-emitting regions, and both ends of the current path are connected to the first selection line and the second selection line to which the pixels of the respective columns are connected; a control signal line connected in common to the control terminals of the first switching elements; and a second control signal line connected in common to the control terminals of the second switching elements; the switch driving circuit pairing the first control signal A control signal is individually applied to the line and the second control signal line, and the conduction of the first switching element and each of the second switching elements is controlled.

The light-emitting device has a plurality of light-emitting regions in which the plurality of pixels are arranged; the plurality of pixels are arranged in an array in the column-direction and the row direction in the light-emitting region; the data line is along the light-emitting region a plurality of strips are arranged in the row direction; the current output from the current supply circuit flows simultaneously with the light-emitting elements of all the pixels of the light-emitting region; the voltage measuring circuit of the data driving portion corresponds to the plurality of data lines A plurality of voltage measuring circuits are disposed along the row direction of the light emitting region, and an average value of the detected voltages of the plurality of pixels connected to each of the plurality of data lines is obtained.

The light-emitting device has a plurality of light-emitting regions in which the plurality of pixels are arranged; the plurality of pixels are arranged in an array in the column direction and the row direction in the light-emitting region; the data lines are arranged in a plurality of rows along the row direction The current output from the current supply circuit flows simultaneously with the plurality of pixels disposed along any one of the light-emitting regions; the voltage measuring circuit of the data driving portion corresponds to the plurality of A plurality of data lines are provided, and the voltage measuring circuits simultaneously obtain the detected voltages of the pixels arranged in the column of the light emitting regions.

A display device having the following components: a power line; a plurality of data lines; a plurality of pixels connected to any one of the plurality of data lines, and having: a light-emitting element, the one end being electrically connected to the power line, The other end is set to a predetermined potential; and the first transistor is connected to each of the data lines and one end of the light-emitting element; the current supply circuit outputs a detection current of the preset current value; and the data driving unit And a voltage measuring circuit that obtains the detection current from the current supply circuit via the power supply line via the data line and a current path of the first transistor of the pixel of at least one of the plurality of pixels, and then The voltage of the one end of the light-emitting element flowing from one end to the other end of the light-emitting element is used as a detection voltage; and the correction circuit is adapted to be supplied from the outside according to the detection voltage obtained by the voltage measurement circuit. The driving data of the image data; and the driving signal supply circuit generate a driving signal according to the modified driving data.

The correction circuit includes: a luminous efficiency extraction unit having a memory circuit for pre-memory illumination a relationship between efficiency and voltage, and the luminous efficiency is a ratio of a luminance corresponding to an initial luminance when the detection current flows in the light-emitting element, the voltage is such that the detection current is in the a voltage between the two ends of the light-emitting element when the light-emitting element flows, and according to the relationship between the light-emitting efficiency stored in the memory circuit and the voltage between the two ends of the light-emitting element, the detection is performed by the voltage measuring circuit The value of the luminous efficiency corresponding to the voltage; and the calculation unit calculates the driving data based on the value of the luminous efficiency extracted by the luminous efficiency extracting unit, and corrects the driving data.

A driving control method for a light-emitting device, which drives a light-emitting device having a light-emitting element, the light-emitting device having: a power line; at least one data line; at least one pixel having: a light-emitting element, one end electrically connected to the power line And the other end is set to a predetermined potential; and the first transistor is connected to the data line and one end of the light emitting element; and the current supply circuit outputs a detection current having a preset current value; The driving control method of the device includes a flow step of causing the detection current to flow from the current supply circuit through the power supply line from one end of the light emitting element to the other end, and the obtaining step of the data line and the first The current path of the transistor obtains a voltage of the one end of the light-emitting element when the detection current flows from one end to the other end of the light-emitting element as a detection voltage.

The driving control method of the illuminating device includes: a correcting step of correcting driving data corresponding to image data supplied from the outside based on the obtained value of the detected voltage; and supplying the step based on the corrected driving data A drive signal is generated and supplied to the pixel via the data line.

The step of correcting the driving data includes: an extracting step, wherein the memory circuit pre-memorizes the relationship between the luminous efficiency and the voltage, and the luminous efficiency indicates that the detecting current flows when the light emitting element flows, corresponding to when the light emitting element has a starting characteristic a brightness ratio of the initial brightness, the voltage is a voltage between the two ends of the light-emitting element when the light-emitting element flows, and the light-emitting efficiency is stored according to the memory circuit and between the two ends of the light-emitting element a value of the luminous efficiency corresponding to the detection voltage obtained by the step of extracting and borrowing the voltage at one end of the light-emitting element; and a correcting step of calculating the driving data according to the extracted luminous efficiency And correct the driver data.

The light-emitting device has a plurality of light-emitting regions in which the pixels are arranged in the column direction and the row direction, and the detection current is output from the one end of the light-emitting element to the other end, and the detection is output from the current supply circuit. a current flowing in the light-emitting element of the pixel of the plurality of pixels located in the light-emitting region; the step of obtaining a voltage at one end of the light-emitting element includes a measuring step of sequentially measuring the light-emitting region The detected voltage of each of the plurality of pixels.

The light-emitting device has a plurality of light-emitting regions in which the pixels are arranged along the column direction and the row direction, the data lines are arranged in a plurality of rows along the row direction, and the detection current is caused to flow from one end of the light-emitting element to the other end. Step: the detection current outputted from the current supply circuit flows simultaneously with the light-emitting elements of the pixels of the light-emitting region; the step of obtaining the voltage at one end of the light-emitting element includes a measurement step, and the measurement is along An average value of the detected voltages of the plurality of pixels arranged in the row direction of the light-emitting region.

Alternatively, the light-emitting device has a plurality of light-emitting regions in which the pixels are arranged along the column direction and the row direction, and the data lines are arranged in a plurality of strips along the row direction; the detection current is made from one end of the light-emitting element to the other end a step of flowing, the detection current outputted from the current supply circuit is simultaneously flowing in the plurality of pixels disposed along any one of the light-emitting regions; and the step of obtaining a voltage at one end of the light-emitting element The method includes an obtaining step of simultaneously obtaining the detected voltage of each pixel arranged in the column of the light emitting region.

According to the present invention, the change in characteristics of the light-emitting element can be detected. Further, drive control can be performed in consideration of variations in characteristics of the light-emitting elements.

In order to achieve the above advantages, a light-emitting device having a pixel including the light-emitting element of the present invention includes a light-emitting region arranged in the vicinity of each intersection of a plurality of selection lines and data lines arranged in the column direction and the row direction. And a plurality of the pixels are arranged; and the data driving unit generates a driving signal corresponding to the image data supplied from the outside, and supplies the image to the pixels via the data line; the pixels each have: current control power a crystal, one end of the current path is connected to the power line, the other end of the current path is connected to one end of the light emitting element, and controls a current flowing to the light emitting element; and a control transistor is selected, and one end of the current path is connected with the data line The other end of the current path and the other end of the current path of the current control transistor are connected to the connection point of the light emitting element, and the control terminal is connected to the selection line; the data driving part has a plurality of current supply circuits. Providing a predetermined detection current for each of the plurality of data lines; and a plurality of voltage measurement circuits for measuring the transistor through the selection So that the detected current controlled current path through the transistor of each pixel of each of the selection from the current supply circuit when the voltage of the light-emitting element of flow between the terminals of each light-emitting element, and as a detection voltage.

The light-emitting device further includes a selective driving unit that applies a selection signal to each of the selection lines to set the pixels of each column to a selected state; and the data driving unit sets the selected driving state to the selected state. This pixel measures the detected voltage.

The data driving unit includes: a correction circuit that corrects driving data corresponding to the image data according to the detection voltage measured by the voltage measuring circuit; and the driving signal supply circuit is based on the modified driving data The drive signal is generated.

The correction circuit has a luminous efficiency extraction portion having a memory circuit that pre-stores a relationship between luminous efficiency and voltage, and the luminous efficiency indicates that the detection current has a starting characteristic when the luminous element flows. a brightness ratio of the initial brightness of the time, the voltage is a voltage between the two ends of the light-emitting element when the detecting current flows, and the luminous efficiency stored in the memory circuit and the two ends of the light-emitting element The relationship of the voltage, and the value of the luminous efficiency corresponding to the detected voltage measured by the voltage measuring circuit is extracted.

The correction circuit includes a calculation unit that calculates the drive data based on the value of the luminous efficiency extracted by the luminous efficiency extraction unit, and corrects the drive data.

A driving control method for a light-emitting device, the light-emitting device having a pixel including a light-emitting device, wherein the plurality of pixels are arranged in a plurality of selection lines and data lines arranged in a column direction and a row direction in a light-emitting region In the vicinity of each intersection, the pixel has a current control transistor, one end of the current path is connected to the power line, and the other end of the current path is connected to one end of the light emitting element to control the current flowing to the light emitting element; And selecting a control transistor, one end of the current path is connected to the data line, and the other end of the current path and the other end of the current path of the current control transistor are connected to the connection point of the light emitting element, and the control terminal and the Selecting a line connection; the method includes: a flow step of supplying a predetermined detection current to each of the plurality of data lines, and causing the detection current to pass through the selection control transistor of the pixels selected as a selected state a current path flowing in the respective light-emitting elements; and a measuring step of measuring between the terminals of the light-emitting elements via the selection control transistor Pressure, and as a detection voltage; and a correction step of, based on the detected based on the detection of voltage is corrected in response to the image information supplied from the outside to the data driver.

The step of correcting the driving data includes: extracting a step of pre-memorizing the relationship between the luminous efficiency and the voltage, and the luminous efficiency is indicative of causing the detecting current to flow when the light emitting element has a starting characteristic when the light emitting element has a starting characteristic. a brightness ratio of the initial brightness, the voltage is a voltage between the two ends of the light-emitting element when the light-emitting element flows, and is extracted according to the relationship between the light-emitting efficiency and the voltage between the two ends of the light-emitting element Measuring the value of the luminous efficiency corresponding to the detected voltage; and correcting the step of correcting the driving data corresponding to the image data according to the extracted luminous efficiency.

In the step of flowing the detection current, the detection current is simultaneously flowed in the light-emitting elements of the pixels in any one of the selected states; in the step of measuring the detection voltage, simultaneously executing the column of the display panel The measurement of the detected voltage of the pixels arranged.

According to the present invention, variations in characteristics of the light-emitting elements can be measured, and variations in characteristics of the light-emitting elements can be compensated.

Hereinafter, a display device (light-emitting device) according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)

Fig. 1 shows the configuration of a display device according to the first embodiment.

The display device according to the first embodiment includes a plurality of pixels 11_ij (i = 1 to m, j = 1 to n, m, n: natural numbers), a light-emitting region 10 in which a plurality of pixels 11_ij are arranged, and an anode circuit (power line driving) The unit 12 is composed of a data driver (data driving unit) 13, a selection driver (selection driving unit) 14, and a control unit 15.

Each of the pixels 11_ij is one pixel corresponding to the image, and is arranged in an array in the column and row directions in the light-emitting region 10. Each of the pixels 11_ij includes a pixel drive circuit including an organic electroluminescence device 111 as a light-emitting element, transistors T1 to T3, and a capacitor (voltage holding portion) C1.

An organic electroluminescent element 111 is a light-emitting element that emits light by an exciton generated by recombination of electrons and holes injected by an organic compound between an anode and a cathode, and is supplied with The current value corresponding to the current value is illuminated.

A pixel electrode is formed on the organic electroluminescent element 111, and a hole injection layer, a light-emitting layer, and a counter electrode (both not shown) are formed on the pixel electrode. The hole injection layer is formed on the pixel electrode and has a function of supplying a hole to the light-emitting layer.

The pixel electrode is made of a conductive material such as ITO (Indium Tin Oxide) or ZnO which is translucent. Each of the pixel electrodes is insulated by an interlayer insulating film (not shown) and pixel electrodes of other adjacent pixels.

The hole injection layer is composed of an organic polymer material that can inject and transport a hole. In addition, as an organic compound-containing liquid containing a hole injection and transport material of an organic polymer system, for example, a PEDOT/PSS aqueous solution which is a polyethylene dioxythiophene (PEDOT) and a doped element which is a conductive polymer is used. The polystyrene sulfonic acid (PSS) of the agent is dispersed in a dispersion of an aqueous solvent.

The light emitting layer is formed on an intermediate layer (not shown). The light-emitting layer has a function of generating light by applying a predetermined voltage between the anode and the cathode.

The light-emitting layer is composed of a polymer light-emitting material which is known to emit fluorescence or light, and the polymer light-emitting material is, for example, a conjugated double-bonded polymer containing a polyparaphenylene system or a polyfluorene system. Red (R), green (G), blue (B) color luminescent materials.

Further, these luminescent materials are formed by applying a solution (dispersion) such as a nozzle coating method or an inkjet method, and volatilizing the following solvent, and the solution (dispersion) is appropriately dissolved (or dispersed) in the water system. Solvent or organic solvent such as tetraphosphorus, tetramethylbenzene, trimethylbenzene or xylene.

Further, in the case of the three primary colors, the RGB luminescent material of the organic electroluminescent element 111 is generally applied to each row.

The counter electrode has a two-layer structure composed of a layer made of a conductive material having a small work function such as Ca or Ba, and a light-reflective conductive layer such as Al, and is connected to a ground line 112 connected to a ground potential.

The current flows from the pixel electrode to the opposite electrode and does not flow in the reverse direction, and the pixel electrode and the counter electrode each become an anode and a cathode.

The organic electroluminescent element 111 is driven for a long time by supplying a current, and the characteristics are gradually deteriorated. In other words, when the characteristics of the organic electroluminescent element 111 are deteriorated, the electric resistance increases and the current hardly flows, and the luminance of the emitted current is lowered, and the luminous efficiency is lowered.

That is, in the case where the characteristics of the organic electroluminescent element 111 are deteriorated, in order to obtain the initial luminance, it is necessary to increase the current supplied to the organic electroluminescent element 111. When the current is increased, the voltage VEL between the cathode and the anode of the organic electroluminescent element 111 will also increase.

This brightness has a correlation with the cathode-anode voltage VEL of the organic electroluminescent element 111. Fig. 2 shows the relationship between the luminous efficiency η and the voltage VEL. The luminous efficiency η is an initial luminance (value) when the organic electroluminescent element 111 has a starting characteristic in the case where a fixed current (current starting value Iel_0: detection current) flows to the organic electroluminescent element 111. It is a parameter indicating the change in brightness at 1 o'clock. Therefore, this second graph shows the amount of change in voltage VEL when the luminous efficiency η changes depending on the driving time.

Further, this relationship is obtained by experimentally, and when the organic electroluminescent element 111 has an initial characteristic, the luminance is 5000 cd/m 2 and the luminance per unit area is 16 cd/A, so that the current starting value Iel_0 flows. In the case of the case where the area of the light-emitting portion is set to 100 μm × 300 μm, the current value of the current start value Iel_0 is 5000 × (100 × 300) / 16 = 9.38 (μA).

In view of the relationship between the luminous efficiency η and the voltage VEL, the display device of the present embodiment is configured to measure a voltage (detection voltage) VEL when the current starting value Iel_0 flows to the organic electroluminescent element 111, and then Based on this voltage VEL, the current value of the supplied current is corrected, thereby obtaining the brightness of the supplied image data.

The transistors T1 to T3 are thin film transistors (TFT: Thin Film Transistor) composed of an n-channel type FET (Field Effect Transistor).

The transistor T1 (third transistor, write control transistor) is a switching transistor for turning on the transistor T3 (second transistor, current control transistor).

The drain (terminal) of the transistor T1 of each pixel 11_ij is connected to the anode line (power supply line) La.

The gate (terminal) of the transistor T1 of each of the pixels 11_11 to 11_m1 is connected to the selection line Ls11. Similarly, the gates of the transistors T1 of the respective pixels 11_12 to 11_m2 are connected to the selection line Ls12, and the gates of the transistors T1 of the respective pixels 11_1n to 11_mn are connected to the selection line Ls1n.

In the case of the pixel 11_11, when a signal of a (Hi: High) level is output from the selection driver 14 to the selection line Ls11, the transistor T1 is turned on, and the transistor T3 is also turned on.

When a signal of a non-conducting (Lo: Low) level is output to the selection line Ls11, the transistor T1 becomes non-conductive, and the transistor T3 also becomes non-conductive. At the same time, when the transistor T1 becomes non-conductive, the charge that has charged the capacitor C11 is maintained.

The transistor T2 (the first transistor, the selection control transistor) is a switching transistor for selecting to be turned on and off by selecting the driver 14, thereby turning the anode circuit 12 and the data driver 13 into conduction. Not conductive.

The drain of one end of the transistor 11_ij, which is one end of the transistor T2, is connected to the anode of the organic electroluminescent element 111.

The gate of the transistor T2 of each of the pixels 11_11 to 11_m1 is connected to the selection line Ls11. Similarly, the gate of the transistor T2 of each of the pixels 11_12 to 11_m2 is connected to the selection line Ls12, and the gate of the transistor T2 of each of the pixels 11_1n to 11_mn is connected to the selection line Ls1n.

Further, the source of each of the pixels 11_11 to 11_1n as the other end of the transistor T2 is connected to the data line Ld1. Similarly, the source of the transistor T2 of each of the pixels 11_21 to 11_2n is connected to the data line Ld2, and the source of the transistor T2 of each of the pixels 11_m1 to 11_mn is connected to the data line Ldm.

In the case of the pixel 11_11, the transistor T2 becomes conductive when a signal for turning on the level is output from the selection driver 14 to the selection line Ls11, and the anode of the organic electroluminescent element 111 is connected to the data line Ld1.

Further, when the signal of the non-conducting level is output to the selection line Ls11, it becomes non-conductive, and the anode of the organic electroluminescent element 111 and the data line Ld1 are cut off.

The function of the transistor T3 is to cause a current supplied from the anode circuit 12 to flow to the organic electroluminescent element 111 when the voltage VEL is measured.

When the voltage VEL is measured, the drain of the transistor T3 of each pixel 11_ij is a current inflow end flowing from the current supplied from the anode circuit 12, and is connected to the anode line La, and the source is the current outflow end from which the current flows, and The anode is connected to the anode of the organic electroluminescent element 111, and the gate is a control terminal for controlling the current value of the current flowing between the drain and the source, and is connected to the source of the transistor T1.

The capacitor C1 is a capacitor that holds the gate-source voltage Vgs (hereinafter referred to as the gate voltage Vgs) of the transistor T3, and one end thereof is connected to the source of the transistor T1 and the gate of the transistor T3, and the other end is connected. The source of the transistor T3 and the anode of the organic electroluminescent element 111 are connected.

When the transistor T1 becomes conductive, the gate-drain of the transistor T3 is connected, and the diode is connected to become conductive. Therefore, a current flows from the anode line La to the drain-source of the transistor T3. The capacitor C1 is charged with the gate voltage Vgs of the transistor T3 at that time, and the charge is stored.

When the transistors T1 and T2 become non-conductive, the capacitor C1 maintains the gate voltage Vgs of the transistor T3.

The anode circuit 12 has a function of supplying a current for measurement to each of the pixels 11_ij via the anode line La at the time of measuring the voltage VEL, and has a writing operation for performing data on each pixel 11_ij and performing corresponding to each pixel 11_ij. In the light-emitting operation of the image data of the electroluminescent device 111, the anode line La is set to have a function of a ground potential and a predetermined voltage (voltage Vsrc) higher than the ground potential, and includes a current supply circuit 121, a switch 122, and 123. A ground line 124 connected to the ground potential and a constant voltage source of the output voltage Vsrc.

The current supply circuit 121 is a current supply source that supplies a current having a predetermined current value. Switch 122 selectively connects voltage Vsrc or ground line 124 to one end of switch 123. Switch 123 selectively connects the output of current supply circuit 121 to the output of switch 122.

The data driver 13 has a function of writing data to the organic electroluminescent element 111 of each pixel 11_ij, and is provided with switches 131-1 to 131-m, buffers 132-1 to 132-m, and an A/D converter 133- 1 to 133-m, correction circuits 134-1 to 134-m, and DAC (D/A converter: drive signal supply circuit) 135-1 to 135-m.

The switches 131-1~131-m are respectively used to selectively input the data lines Ld1 to Ldm and the outputs of the buffers 132-1 to 132-m or the outputs of the D/A converters 135-1 to 135-m. connection.

Each of the buffers 132-1 to 132-m is for blocking the inflow of current from each of the pixels 11_in to 11mn, and is constituted by, for example, an operational amplifier having a high input impedance. Each of the buffers 132-1 to 132-m supplies the analog voltage VEL measured via the data lines Ld1 to Ldm to the A/D converters 133-1 to 133-m.

The A/D converters 133-1 to 133-m are each used to measure the analog voltage VEL supplied from the buffers 132-1 to 132-m, and convert the measured analog voltage VEL into a digital voltage VEL. . The A/D converters 133-1 to 133-m supply the converted voltage VEL to the correction circuits 134-1 to 134-m. Each of the buffers 132-1 to 132-m and the A/D converters 133-1 to 133-m connected thereto correspond to the voltage measuring circuit of the present invention.

The correction circuits 134-1 to 134-m are each a circuit which corrects the voltage VEL supplied from the A/D converters 133-1 to 133-m in order to obtain the brightness corresponding to the supplied image data. The value of the drive data Vdata corresponding to the image data.

Each of the correction circuits 134-1 to 134-m includes the luminous efficiency extraction units 136-1 to 136-m, the memories 137-1 to 137-m, and the arithmetic units 138-1 to 138- as shown in Fig. 3 . m.

Each of the luminous efficiency extracting units 136-1 to 136-m extracts and emits a luminous efficiency η corresponding to the voltage VEL obtained by the measurement, and has a LUT (Look Up Table) as shown in FIG.

This LUT is a table showing the relationship between the voltage VEL, the luminance, and the luminous efficiency η, and is created based on the relationship between the luminous efficiency η and the voltage VEL shown in Fig. 2 .

This LUT is a relationship between the change in luminance, the luminous efficiency η, and the voltage VEL in the case where the current of the current starting value Iel_0 flows to the organic electroluminescent element 111.

This LUT indicates that when the organic electroluminescent element 111 has an initial characteristic, a current of a desired current starting value Iel_0 is flowed in order to obtain a luminance of 5000 cd/m 2 , and when the luminance becomes 3000 cd/m 2 , the luminous efficiency becomes η...=0.60,=3000/5000=0.60, the voltage VEL is increased from the starting value of 7.85V to 8.30V.

Further, in the present embodiment, the LUT is formed to correspond to one current start value Iel_0 (detection current), and a current corresponding thereto is supplied from the current supply circuit 121 of the anode circuit 12, but the present invention is not limited thereto. A detection current for causing the LUT to correspond to a plurality of different current values of two or more levels may be employed, and the current supply circuit 121 of the anode circuit 12 is used to supply a current value corresponding to the corresponding plurality of levels. The composition of the current. In this case, the measurement of the voltage VEL is performed plural times in response to the respective detection currents.

The luminous efficiency extracting portions 136-1 to 136-m each refer to the LUT, and extract the luminous efficiency η corresponding to the voltage VEL.

Each of the memories 137-1 to 137-m is a memory (memory circuit) for storing the luminous efficiency η extracted by the luminous efficiency extraction portions 136-1 to 136-m.

Each of the calculation units 138-1 to 138-m is supplied with image data, and acquires drive data Vdata for obtaining brightness corresponding to the image data.

Each of the calculation units 138-1 to 138-m reads out the luminous efficiency η from the memories 137-1 to 137-m when writing by the drive data Vdata.

The arithmetic units 138-1 to 138-m are each used to set a current value Ielf_0 required for obtaining the brightness corresponding to the supplied image data when the organic electroluminescent element 111 has the initial characteristic, and the memory 137- The reciprocal of the readout luminous efficiency η is multiplied to obtain the current correction value Ielf_1.

Then, the arithmetic units 138-1 to 138-m obtain the drive data Vdata based on the characteristics of the drain-source current corresponding to the gate voltage of the transistor T3 of each pixel 11_ij and the current correction value Ielf_1.

Each of the D/A converters 135-1 to 135-m converts the drive data Vdata obtained by the calculation units 138-1 to 138-m into a drive signal Vd (negative voltage) of a write voltage which is analogous.

Each of the D/A converters 135-1 to 135-m applies the drive signal Vd of the write voltage to the other end of the transistor T2 of each of the pixels 11_11 to 11_mn via the data lines Ld1 to Ldm, thereby passing through the transistor. T2, while introducing current from the transistor T3.

The selection driver 14 is controlled by the control unit 15 and is used to select a pixel 11_ij for each column, for example, a shift register. The selection drivers 14 each output a signal having a conduction level or a non-conduction level to the selection lines Ls11 to Ls1n.

The control unit 15 controls each unit. The control unit 15 controls the respective units to correct the current value of the current supplied when the drive signal is written, based on the fluctuation of the voltage VEL of the organic electroluminescent element 111, thereby obtaining the desired luminance.

Therefore, the control unit 15 controls each unit to measure the voltage VEL of the organic electroluminescent element 111 of each pixel 11_ij, and writes a drive signal Vd belonging to the write voltage between the gate and the source of the transistor T3 of each pixel 11_ij. The organic electroluminescent element 111 is caused to emit light.

The display device of the first embodiment measures the voltage VEL for each row. Further, the display device performs the measurement of the voltage VEL, for example, at the time of power-on, every day, or every fixed time.

In the case where the measurement of the voltage VEL is performed for each row, the control unit 15 controls the anode circuit 12, the data driver 13, and the selection driver 14 so that current flows from the anode circuit 12 to the organic electroluminescent element 111 of each pixel 11_ij. The ground line 112 flows.

When writing the drive data Vdata, the control unit 15 controls the anode circuit 12, the data driver 13, and the selection driver 14 so that current does not flow from the anode circuit 12 to the organic electroluminescent element 111 of each pixel 11_ij. The data driver 13 flows.

In the case where the organic electroluminescent element 111 is caused to emit light, the control unit 15 controls the anode circuit 12, the data driver 13, and the selection driver 14 to form a gate voltage Vgs of the transistor T3 written in the capacitor C1 of each pixel 11_ij. A current is supplied to the organic electroluminescent element 111.

Next, the operation of the display device of the first embodiment will be described.

First, the operation when the voltage VEL of the organic electroluminescent element 111 of each pixel 11_ij is measured will be described.

The display device measures the voltage VEL of the organic electroluminescent element 111 of each pixel 11_ij. As shown in Fig. 5, the control unit 15 controls the switch 123 so that the current supply circuit 121 of the anode circuit 12 and the anode line La are connected in order to measure the voltage VEL.

The control unit 15 controls the switches 131-1 to 131-m to connect the buffers 132-1 to 132-m of the data driver 13 and the data lines Ld1 to Ldm, respectively.

Further, the control unit 15 controls the selection driver 14 to output a signal of the conduction level to all of the selection lines Ls11 to Ls1n.

When the selection driver 14 outputs a signal of the conduction level to the selection lines Ls11 to Ls1n, the transistors T1 and T2 of all the pixels 11_ij become conductive. When the transistor T1 is turned on, it is connected between the gate and the drain of the transistor T3, and the transistor T3 is turned on, and the diode is operated.

Fig. 6 is a view showing the drain-source-to-source voltage Vds of the transistor T3 versus the drain-source current Ids characteristic and the load line SPe1 of the organic electroluminescent element 111. The operating point of the transistor T3 is the intersection of the Vds of the transistor T3 with the Ids characteristic diagram and the load line SPe1 of the organic electroluminescent element 111, and is represented by P3 in Fig. 6, and operates in a saturated region.

In addition, in Fig. 6, P0 is the pinch point, Vth is the threshold voltage, and the region from the 0V to the pinch-off voltage of the drain-source voltage Vds is an unsaturated region, and the drain-source voltage is The area above the clamping voltage of Vds is the saturated area.

When the transistors T1 to T3 of all the pixels 11_ij are turned on, since the current supply circuit 121 and the anode line La are connected, the current supplied from the current supply circuit 121 is distributed and flows to the transistor T3 of all the pixels 11_ij.

Here, the current value of the current supplied from the current supply circuit 121 is set such that the average value of the current flowing to each of the pixels 11_ij becomes a current value equal to the current start value Ie1_0.

Since the buffers 132-1 to 132-m of the data driver 13 are high impedance, this current does not flow to the data driver 13. Therefore, the organic electroluminescent element 111 passing through all the pixels 11_ij flows to the ground line 112.

The buffers 132-1 to 132-m each acquire voltages of the data lines Ld1 to Ldm via the switches 131-1 to 131-m. The on-resistance of the transistor T2 of each pixel 11_ij is almost negligible because the gate voltage Vgs is high. Therefore, the voltages of the data lines Ld1 to Ldm obtained by the buffers 132-1 to 132-m become the voltage VEL of the organic electroluminescent element 111.

Further, since the data line Ld1 is connected to the anodes of the respective organic electroluminescent elements 111 via the respective transistors T2 of the pixels 11_11 to 11_1n of one row, the voltage of the data line Ld1 becomes one pixel 11_11 to 11_1n of one row. The averaged voltage VEL of the organic electroluminescent element 111. The buffer 132-1 supplies this voltage VEL to the A/D converter 133-1.

Similarly, the buffers 132-2 to 132-m are each averaged through each of the columns of the organic electroluminescent elements 111 of the pixels 11_ij to which the data lines Ld2 to Ldm are connected via the switches 131-2 to 131-m. The voltage VEL is supplied to the A/D converters 133-2 to 133-m.

In this manner, the A/D converters 133-1 to 133-m measure the voltage VEL of the organic electroluminescent element 111 averaged for each column by the analog values via the buffers 132-1 to 132-m. Then, the A/D converters 133-1 to 133-m each convert the analog voltage VEL into a digital voltage VEL. Here, the buffers 132-1 to 132-m and the A/D converters 133-1 to 133-m constitute the voltage measuring circuit of the present invention.

The luminous efficiency extraction units 136-1 to 136-m of the correction circuits 134-1 to 134-m each refer to the LUT, and extract the light corresponding to the converted voltage VEL of the A/D converters 133-1 to 133-m. Efficiency η. Luminous efficiency of extracting section 136-1 ~ 136-m each of the memory extracted in the memory 137-1 η ~ 137-- *.

Next, an operation when the organic electroluminescent element 111 of each pixel 11_ij is driven in accordance with the driving data will be described.

When the image data is supplied, the display device writes the drive data Vdata to each of the pixels 11_11 to 11_mn. At this time, as shown in Fig. 7, the control unit 15 controls the switches 122 and 123 of the anode circuit 12 so that the anode line La becomes a ground potential. The switch 122 connects the ground line 124 and one end of the switch 123, and the switch 123 connects one end of the switch 123 to the anode line La, and connects the anode line La and the ground line 124.

Next, the control unit 15 controls the selection driver 14 to output a signal of the conduction level to the selection line Ls11, and outputs a signal of a non-conduction level to the selection lines Ls12 to Ls1n, thereby selecting the pixels 11_11 to 11_m1.

The calculation units 138_1 to 138_m read out the luminous efficiency η of each of the pixels 11_11 to 11_m1 from the memory 137_1 to 137_m, and obtain the driving data Vdata based on the read luminous efficiency η.

Each of the D/A converters 135_1 to 135_m of the data driver 13 converts the drive data Vdata obtained by the calculation units 138_1 to 138_m into a drive signal Vd of an analog voltage.

The control unit 15 controls the switches 131_1 to 131_m to connect the D/A converters 135_1 to 135_m of the data driver 13 and the data lines Ld1 to Ldm.

Each of the D/A converters 135_1 to 135_m of the data driver 13 applies a drive signal Vd which is an analog-to-digital conversion write voltage to the data lines Ld1 to Ldm.

The anode line La is at the ground potential, and since the potential of the cathode of the organic electroluminescent element 111 of each of the pixels 11_11 to 11_m1 is also the ground potential, the current does not flow to the organic electroluminescent element 111 of each of the pixels 11_11 to 11_m1.

Further, since the drive voltage Vd of the write voltage is a negative voltage, the current flows from the anode circuit 12 to the D/A converter of the data driver 13 via the transistors T3 and T2 of the respective pixels 11_11 to 11_m1 and the data lines Ld1 to Ldm. 135-1~135-m.

Since each of the transistors T1 of the respective pixels 11_11 to 11_m1 is turned on, the gates and the drains of the respective transistors T3 are connected, and the diodes are connected. Therefore, the transistor T3 operates in the saturation region, and the gate current Id due to the diode characteristics flows to the transistor T3, and the operating point thereof becomes the operating point P2 of Fig. 6.

The transistor T1 becomes conductive, since the drain current Id flows to the transistor T3, so the gate voltage Vgs of the transistor T3 is set to a voltage corresponding to the drain current Id, and the capacitor C1 is charged by this gate voltage Vgs.

In this manner, the data driver 13 introduces a current corrected based on the measured voltage VEL from the transistor T3 of each of the pixels 11_11 to 11_m1, and causes the capacitor C1 to maintain the gate voltage Vgs of the transistor T3 according to the driving data Vdata.

Hereinafter, the control unit 15 controls the selection driver 14 to sequentially select the pixels 11_12 to 11_m2, ..., the pixels 11_1n to 11_mn, and write the voltage according to the driving data Vdata to the transistor T3 of each of the pixels 11_11 to 11_mn. Capacitor C1 between the gate and the source.

After the drive data Vdata is written to the gate-source capacitor C1 of the transistor T3 of all the pixels 11_ij, the display device causes the organic electroluminescent element 111 of each pixel 11_ij to emit light.

At this time, as shown in FIG. 8, the control unit 15 controls the selection driver 14 to output a signal of a non-conduction level to all of the selection lines Ls11 to Ls1n, and causes the transistors T1 and T2 of all the pixels 11_ij to become Not conductive.

When the transistors T1 and T2 of the respective pixels 11_ij become non-conductive, the transistor T3 becomes a non-selected state. When the transistor T3 is in the non-selected state, the gate-source voltage Vgs of the transistor T3 is maintained at the voltage that has been written to the capacitor C1.

Moreover, at this time, the control unit 15 controls the switches 122 and 123 of the anode circuit 12 to apply a voltage Vsrc to the anode line La. This voltage Vsrc is set to, for example, about 12V.

At this time, since the gate voltage Vgs of the transistor T3 is held by the capacitor C1, the operating point of the transistor T3 becomes the operation line of the held gate voltage Vgs and the organic electroluminescent element 111 as shown in Fig. 6. The operating point P3 of the intersection of the load line SPe1. The voltage value of this voltage Vsrc is set to a voltage value at which the operating point P3 becomes a state in which the saturation region of the transistor T3 operates.

On the other hand, between the drain and the source of the transistor T3, the drain current Id having the same current value as the write current when the drive data Vdata is written flows. The transistor T2 becomes non-conductive, and since the potential on the anode side of the organic electroluminescent element 111 becomes higher than the potential on the cathode side, the drain current Id is supplied to the organic electroluminescent element 111.

At this time, the current Id flowing to the organic electroluminescent element 111 of each pixel 11_ij is corrected based on the measured voltage VEL.

For example, in the case of the organic electroluminescent element 111 of the pixel 11_11, the luminance of the organic electroluminescent element 111 is 8.30 V, depending on the brightness of the supplied image data is 5000 cd/m 2 . Uncorrected, the brightness was reduced to 3000 cd/m 2 .

In this case, the luminous efficiency extracting unit 136-1 obtains the luminous efficiency η=0.6 from the voltage VEL=8.30 V, referring to the LUT shown in FIG. 4 .

The calculation unit 1381 refers to the memory 1371 and obtains η=0.6 as a current value for obtaining a luminance of 5000 cd/m 2 , and sets the current start value Iel_0 to 1/η=1.67 times to obtain the current correction value Iel_1.

In other words, the current of 1.67 times the current starting value Iel_0 is corrected to flow to the organic electroluminescent element 111 of the pixel 11_11, and as a result, the organic electroluminescent element 111 emits light at a luminance of 5000 cd/m 2 .

As described above, according to the first embodiment, the control unit 15 writes the drive data Vdata to each of the pixels 11_ij, and then controls the transistors T1 and T2 of the respective pixels 11_ij to be turned on, and then controls the anode circuit 12 to A current is supplied from the anode circuit 12 to the organic electroluminescent element 111 via the transistor T3 of each pixel 11_ij.

Further, the data driver 13 is provided with buffers 132-1 to 132-m having high impedance input impedance.

Therefore, each of the A/D converters 133-1 to 133-m of the data driver 13 can measure each row of the organic electroluminescent elements 111 for the respective pixels 11_ij via the high-impedance buffers 132-1 to 132-m. The averaged voltage vEL.

Further, each of the correction circuits 134-1 to 134-m is configured to obtain the brightness of the supplied image data as follows: the supply of the organic power is corrected based on the voltage VEL measured by the A/D converters 133-1 to 133-m. The current value of the current of the light-emitting element 111 is obtained, and the drive data Vdata is obtained.

Further, the control unit 15 controls the anode circuit 12 to have the same potential as the organic electroluminescent element 111, and the D/A converters 135-1 to 135-m of the data driver 13 are made to write a negative voltage. The drive signals Vd are each applied to the data lines Ld1 to Ldm.

Therefore, the drive data Vdata corresponding to the brightness of the supplied image data can be written in response to the value of the measured voltage VEL. Therefore, even if the organic electroluminescent element 111 is driven for a long period of time, the organic electroluminescent element 111 can be made to emit light in accordance with the brightness of the supplied image data.

As described above, in the case of the RGB three primary colors, RGB luminescent materials are generally applied to each row. If the materials of the organic electroluminescent elements 111 are different, the degree of deterioration is also different. However, in the first embodiment, since the voltage vEL averaged for each row is measured, it is not necessary to consider the difference of the materials, and the average of the organic electroluminescent elements 111 produced by the same material can be measured. Voltage VEL.

(Second embodiment)

The display device of the second embodiment is configured to measure the voltage of each of the organic electroluminescent elements for each column.

In the image display, in the case where the frequency of the horizontal line is large, the current values flowing in each column are different. Thus, the value of the voltage VEL also varies for each column. Even in this case, the display device of the second embodiment measures the voltage VEL for each column in order to accurately measure the voltage VEL.

The display device of the second embodiment has the configuration shown in Fig. 1 as in the first embodiment.

Next, the operation of the display device of the second embodiment will be described.

At the measurement operation of the voltage VEL, the control unit 15 measures the voltage VEL of the organic electroluminescent element 111 of each pixel 11_ij of each column. As shown in Fig. 9, the control unit 15 controls the switch 123 so that the current supply circuit 121 of the anode circuit 12 and the anode line La are connected.

The control unit 15 controls the switches 131-1 to 131-m to connect the buffers 132-1 to 132-m of the data driver 13 and the data lines Ld1 to Ldm, respectively.

The control unit 15 controls the selection driver 14 to output a signal of the conduction level to the selection line Ls11, and outputs a signal of the non-conduction level to the selection lines Ls12 to Ls1n, and selects the pixels 11_11 to 11_m1 of the first column.

When the selection driver 14 outputs a signal of a non-conduction level to the selection lines Ls12 to Ls1n, the transistors T1 to T3 of the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn become non-conductive.

Since the transistors T1 to T3 of the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn become non-conductive, the current supplied from the current supply circuit 121 does not flow to the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn.

When the selection driver 14 outputs a signal of the conduction level to the selection line Ls11, the transistors T1 and T2 of the pixels 11_11 to 11_m1 of the first column become conductive. As in the case of the first embodiment, the gate-drain is connected between the gates of the transistor T3, and the transistor T3 is turned on, and the diode is operated to operate in the saturation region. P2 of Figure 6.

When the transistors T1 to T3 of the pixels 11_11 to 11_ml are turned on, since the current supply circuit 121 and the anode line La are connected, the current supplied from the current supply circuit 121 is distributed and flows to the transistor T3 of the pixels 11_11 to 11_ml.

Here, the current value of the current supplied from the current supply circuit 121 is set so that the average value of the current flowing to each of the pixels 11_11 to 11_ml of the J column becomes a current value equal to the current start value Ie1_0.

Since the buffers 132-1 to 132-m of the data driver 13 are high impedance, this current does not flow to the data driver 13. Therefore, current flows through the organic electroluminescent element 111 of the pixels 11_11 to 11_ml and flows to the ground line 112.

The buffers 132-1 to 132-m of the data driver 13 respectively acquire the voltages of the data lines Ld1 to Ldm via the switches 131-1 to 131-m.

Since the on-resistance of the transistor T2 of the pixels 11_11 to 11_ml is negligible, the voltages obtained by the buffers 132-1 to 132-m become the voltage VEL of each of the organic electroluminescent elements 111 of the pixels 11_11 to 11_ml.

The buffers 132-1 to 132-m each supply the obtained voltage VEL to the A/D converters 133-2 to 133-m. The A/D converters 133-1 to 133-m convert the analog voltage VEL of the organic electroluminescent elements 111 of the pixels 11-11 to 11-m1 measured by the buffers 132-1 to 132-m into digital numbers. The voltage VEL is supplied to the correction circuits 134-1 to 134-m.

The luminous efficiency extraction units 136-1 to 136-m of the correction circuits 134-1 to 134-m each average the voltage VEL converted by the A/D converters 133-1 to 133-m, and refer to the LUT. The luminous efficiency η corresponding to the average value of the voltage VEL of one column is extracted.

Each of the luminous efficiency extracting portions 136-1 to 136-m stores the extracted luminous efficiency η in the memory bodies 137-1 to 137-m.

After the luminous efficiency η is stored in the memory 137-1 to 137-m, the control unit 15 selects the pixels 11_12 to 11_m2 in the second column, and obtains the voltage VEL of each of the pixels 11_12 to 11_m2 in the same manner as the first column. Further, the luminous efficiency η corresponding to the average value of the voltage VEL of each column is extracted, and the luminous efficiency η corresponding thereto is stored in the memory 137-1 to 137-m.

In this manner, the control unit 15 sequentially selects the pixels 11_13 to 11_mn of the respective columns, and the memories 137-1 to 137-m memorize the luminous efficiency η corresponding to the average value of the voltages VEL of each column.

In the present embodiment, the display operation of the organic electroluminescent element 111 in accordance with each pixel 11_ij of the image data is the same as in the case of the first embodiment, and when the image data is supplied, the display device writes each pixel 11_11 to 11_mn. Enter the driver data Vdata.

At this time, the control unit 15 sequentially selects the pixels 11_11 to 11_m1, ..., 11_1n to 11_mn as in the first embodiment.

The computing units 138-1 to 138-m of the data driver 13 read out the luminous efficiency η of the pixels 11_ij of the respective columns selected by the control unit 15 from the memories 137-1 to 137-m, and based on the read luminous efficiency. The current value is corrected by η, and the driving data Vdata is obtained.

Each of the D/A converters 135-1 to 135-m converts the drive data Vdata obtained by the arithmetic units 138-1 to 138-m into a drive signal Vd of a write voltage of a negative analogy, and is negative according to this. The write voltage drive signal Vd writes the drive data Vdata between the gate and the source of the transistor T3 of the pixel 11_ij of each column selected by the control unit 15.

When the display device writes the pixels 11_ij of all the columns, the organic electroluminescent element 111 of each pixel 11_ij emits light as in the first embodiment.

As described above, according to the present embodiment, the display device is configured to control the respective portions, and to measure and write the voltage VEL of the organic electroluminescent element 111 of each pixel 11_ij for each column.

Therefore, the average voltage VEL for each column can be obtained, especially in the image display, even if the frequency of the horizontal line is large, the voltage VEL can be accurately measured in the case where the voltage VEL of each column is different.

(Third embodiment)

The display device according to the third embodiment is a voltage for forming an organic electroluminescence element for measuring each pixel for each pixel.

For example, when the display is performed for a long time as an indicator of a digital camera, if the organic electroluminescent element 111 partially deteriorates, the voltage VEL becomes different for each pixel. In the display device of the third embodiment, even in this case, in order to accurately measure the voltage VEL of each of the organic electroluminescent elements 111, the voltage VEL is measured for each pixel.

Fig. 10 is a view showing the configuration of a display device according to a third embodiment.

In addition to the first selection driver 14 (first selection drive unit) having the same configuration as that of the first embodiment, the display device of the third embodiment further includes a second selection driver 16 (second selection drive unit). Here, the first selection driver 14 is controlled by the control unit 15, and controls the conduction and non-conduction of the transistor T1 (third transistor) of each pixel 11_ij, and the second selection driver 16 is controlled by the control unit 15, and is controlled. The transistor T2 (first transistor) of each pixel 11_ij is turned on and off.

The gates of the respective transistors T2 of the pixels 11_11 to 11_m1, 11_12 to 11_m2, ..., 11_1n to 11_mn are connected to the second selection driver 16 via the selection lines Ls21 to Ls2n.

Next, the operation of the display device of the third embodiment will be described.

The control unit 15 of the display device controls each unit, selects the selected column, selects the selected pixel 11_ij, and writes the on-level of one pixel 11_ij of the selected column, and writes the turned-on level. The pixel 11_ij measures the voltage VEL of the organic electroluminescent element 111.

In the voltage writing operation for the pixel 11_ij, the control unit 15 first controls the switches 122 and 123 of the anode circuit 12 so as to connect the anode line La and the ground line 124 to the ground potential as shown in FIG.

The control unit 15 controls the first selection driver 14 and the second selection driver 16 to select the pixel 11_11. In other words, the control unit 15 controls the first selection driver 14 to output a signal of a conduction level to the selection line Ls11, and outputs a signal of a non-conduction level to the selection lines Ls12 to Ls1n.

Further, the control unit 15 controls the second selection driver 16 to output a signal of the conduction level to the selection line Ls21, and outputs a signal of the non-conduction level to the selection lines Ls22 to Ls2n.

When the first selection driver 14 outputs a signal of a non-conduction level to the selection lines Ls12 to Ls1n, the transistor T1 of each of the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn becomes non-conductive.

When the second selection driver 16 outputs a signal of a non-conduction level to the selection lines Ls22 to Ls2n, the transistor T2 of each of the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn becomes non-conductive.

When the transistors T1 and T2 of the respective pixels 11_12 to 11_m2, ..., 11_1n to 11_mn become non-conductive, current does not flow to the respective pixels 11_12 to 11_m2, ..., 11_1n to 11_mn.

On the other hand, when the first selection driver 14 outputs a signal of the conduction level to the selection line Ls11, the transistor T1 of the pixels 11_11 to 11_m1 is turned on.

When the second selection driver 16 outputs a signal of the conduction level to the selection line Ls21, the transistor T2 of the pixels 11_11 to 11_m1 becomes conductive.

When the transistors T1 and T2 of the pixels 11_11 to 11_m1 are turned on, the D/A converter 135_1 sets the drive signal applied to the write voltage of the pixel 11_11 to a first write of a low potential which is sufficiently lower than the potential of the anode line La. The drive signal Vd1 of the input voltage.

The voltage value of the drive signal Vd1 of the first write voltage has a value exceeding the threshold value of the transistor T1, and the transistor T3 is turned on, and is set to the drive signal Vd1 at which the first write voltage is written. The current value of the current flowing to the pixel 11_11 becomes a value larger than the current value larger than the current (current starting value Iel_0) supplied from the anode circuit 12 at the time of measuring the voltage VEL.

On the other hand, the D/A converters 135-2 to 135-m set the drive signals applied to the write voltages of the pixels 11_21 to 11_m1 to drive the second write voltage that does not exceed the threshold value of the transistor T3. Signal Vd2. Therefore, the transistor T3 of the pixels 11_21 to 11_m1 becomes a non-conduction state. The voltage value of the drive signal Vd2 of the second write voltage is, for example, 0V.

The control unit 15 controls the switches 131-1 to 131-m to connect the data lines Ld1 to Ldm to the D/A converters 135-1 to 135-m of the data driver 13, respectively.

When the data lines Ld1 to Ldm are connected to the D/A converters 135-1 to 135-m of the data driver 13, with respect to the data line Ld1, since the transistor T3 of the pixel 11_11 becomes conductive, the current flows from the ground line of the anode circuit 12. 124, flowing through the anode line La, the transistor T3 of the pixel 11_11, the transistor T2, and the data line Ld1 to the D/A converter 135-1, since the anode of the organic electroluminescent element 111 becomes a negative potential, The organic electroluminescent element 111 of the pixel 11_11 flows. Further, in the data lines Ld2 to Ldm, since the transistor T3 of the pixels 11_21 to 11_m1 is in a non-conducting state, current does not flow. Further, since the anode of the organic electroluminescent element 111 is at the ground potential or the negative potential, the current does not flow to the organic electroluminescent element 111 of the pixel 11_21 to 11_m1.

Since the transistor T1 is turned on, the transistor T3 of the pixel 11_11 is diode-connected and operates in a saturated region, and its operating point becomes the operating point P2 of FIG.

Then, the voltage value of the state of the current flowing between the gate and the source of the transistor T3 is performed between the gate and the source of the transistor T3 of the pixel 11_11 of the first column by the drive signal Vd1 of the first write voltage. The voltage is written so that the current does not flow between the gate and the source of the transistor T3 according to the driving signal Vd2 of the second write voltage between the gate and the source of the transistor T3 of the pixel 11_21 to 11_m1. The voltage value of the voltage is written.

Next, after the measurement operation of the voltage VEL of the pixel 11_11 is performed as described above, the control unit 15 controls the switch 123 to supply a current from the current supply circuit 121 to the anode line La as shown in FIG. The current value of the current supplied from the current supply circuit 121 is set to a current value equal to the current start value Iel_0.

Then, the control unit 15 controls the first selection driver 14 to output a signal of a non-conduction level to the selection line Ls11. The control unit 15 controls the second selection driver 16 to continue to output a signal of the conduction level to the selection line Ls21.

When the signal of the non-conducting level is output to the selection line Ls11, the transistor T1 of the pixels 11_11 to 11_m1 becomes non-conductive.

The control unit 15 controls the switches 131-1 to 131-m to connect the data lines Ld1 to Ldm and the buffers 132-1 to 132-m, respectively.

In the pixel 11_11, between the gate and the source of the transistor T3, since the voltage is written to the level between the drain and the source of the transistor T3, even if the transistor T1 becomes non-conductive, the transistor T3 The gate-source voltage is also maintained at the gate voltage Vgs of the voltage written to the capacitor C1 by a voltage written above the threshold.

Therefore, the gate voltage Vgs of the transistor T3 of the pixel 11_11 does not change, and the transistor T3 operates as shown in the operation point P1 in FIG. 6 on the operation line where the gate voltage Vgs is fixed, and operates in the unsaturated region. .

On the other hand, in the pixels 11_21 to 11_m1, voltage writing between the gate and the source of the transistor T3 does not flow to the drain-source of the transistor T3 because of the gate of the transistor T3. Since the voltage between the pole and the source does not exceed the threshold value, the transistor T3 is rendered non-conductive regardless of whether the transistor T1 is turned on or off. Therefore, the current from the current supply circuit 121 is not supplied to the respective organic electroluminescent elements 111 of the pixels 11_21 to 11_m1.

Therefore, the current supplied from the current supply circuit 121 flows only to the organic electroluminescent element 111 of the pixel 11_ij, and flows to the ground line 112 via the organic electroluminescent element 111.

At this time, the A/D converter 133-1 of the data driver 13 measures the voltage VEL of the organic electroluminescent element 111 via the transistor T2, the data line Ld1, the switch 131-1, and the buffer 132-1.

The luminous efficiency extracting portion 136-1 of the correcting circuit 134-1 converts the voltage VEL measured by the A/D converter 133-1 into the luminous efficiency η, and stores it in the memory 137-1.

After the luminous efficiency extraction unit 136-1 stores the luminous efficiency η in the memory 137-1, the control unit 15 controls the first selection driver 14, the second selection driver 16, and the data driver 13, for the pixels 11_21, ..., 11_m1, The voltage writing between the gate and the source of the respective transistor T3 is performed to the level between the drain and the source of the transistor T3, and the voltage VEL is measured. Then, according to the second column to the first column In the order of the n columns, each voltage writing and the measurement of each voltage VEL are sequentially performed for each pixel 11_ij of each column. In this manner, voltage writing is performed between the gate and the source of the transistor T3 of all the pixels 11_ij to the level between the drain and the source of the transistor T3, and the respective voltages VEL are sequentially measured.

In this manner, the display device measures the voltage VEL of the organic electroluminescent element 111 of all the pixels 11_ij.

When the image data is supplied, the display device corrects the current value based on the measured voltage VEL as in the first embodiment, and writes the drive data Vdata between the gate and the source of the transistor T3 of each of the pixels 11_11 to 11_m1. . Then, the display device causes the organic electroluminescent element 111 of each pixel 11_ij to emit light.

As described above, according to the present embodiment, the first selection driver 14 and the second selection driver 16 are used to selectively perform a voltage value in a state in which a current flows between the drain and the source of the transistor T3. The voltage is written, and the voltage that does not flow to the voltage value between the drain and the source of the transistor T3 is written, and the transistors T1 and T2 of the respective pixels 11-ij are individually controlled to be turned on and off. And measuring the voltage VEL of the organic electroluminescent element 111 of each pixel 11-ij.

Therefore, the voltage VEL of the organic electroluminescent element 111 can be measured for each pixel. Therefore, even if the display is performed for a long time as in the case of a digital camera, the voltage VEL can be accurately measured for each pixel as the voltage VEL varies depending on each pixel.

(Fourth embodiment)

In the display device of the fourth embodiment, the configuration of the third embodiment is changed, and the voltage of each of the organic electroluminescent elements is measured for each pixel as in the third embodiment.

Fig. 13 is a view showing the configuration of a display device according to a fourth embodiment.

In addition to the selection driver 14 (first selection drive unit) similar to the configuration of the first embodiment, the display device of the fourth embodiment further includes a second selection drive unit including transistors T11-1 to T11- n (first switching element), transistors T12-1 to T12-n (second switching element), gate line Lg1 (first control signal line), gate line Lg2 (second control signal line), and switch A driver (switch drive circuit) 17 is formed.

Each of the transistors T11-1 to T11-n is a transistor for connecting and disconnecting the selection lines Ls31 to Ls3n and the low level line Lm. A low level voltage is applied to this low level line Lm. The transistors T11 - 1 to T11-n are TFTs composed of n-channel type transistor FETs.

The drains of the transistors T11-1 to T11-n are each connected to the selection lines Ls31 to Ls3n, and the sources are connected to the low level line Lm. Further, the gates of the transistors T11-1 to T11-n are connected in common to the gate line Lg1.

The transistors T12-1 to T12-n are transistors for connecting and disconnecting the selection lines Ls11 and Ls31, ..., Ls1n and Ls3n. The transistors T12-1 to T12-n are TFTs composed of n-channel type transistor FETs.

The drains of the transistors T12-1 to T12-n are each connected to the selection lines Ls31 to Ls3n, and the sources are connected to the selection lines Ls11 to Ls1n, respectively. Further, the gates of the transistors T12-1 to T12-n are connected in common to the gate line Lg2.

The switch driver 17 is controlled by the control unit 15 to output a signal of a conduction (Hi) level or a non-conduction (Lo) level to the gate lines Lg1 and Lg2, respectively.

Next, the operation of the display device of the fourth embodiment will be described.

The display device performs voltage writing of a voltage value in a state in which a current flows between the drain and the source of the transistor T3 only between the gate and the source of the transistor T3 of one pixel 11_ij among the selected columns. Thereafter, the voltage VEL of the organic electroluminescent element 111 is measured for the voltage-written 110.

In the voltage writing operation for the pixel 11_ij, the control unit 15 controls the switches 122 and 123 of the anode circuit 12 to change the anode line La to the ground potential as shown in Fig. 14 .

The control unit 15 controls the selection driver 14 to output a signal of the conduction level to the selection line Ls11, and outputs a signal of a non-conduction level to the selection lines Ls12 to Ls1n, and selects the pixels 11_11 to 11_m1.

Moreover, the control unit 15 controls the switch driver 17 to output a signal of a non-conducting (Lo) level and a conducting (Hi) level to the gate lines Lg1 and Lg2, respectively.

When the switch driver 17 outputs a signal of a non-conducting level to the gate line Lg1, the transistors T11-1 to T11-n become non-conductive, and the selection lines Ls31 to Ls3n and the low level line Lm are cut.

When the switch driver 17 outputs a signal of the conduction level to the gate line Lg2, the selection line Ls11 is connected to Ls31, ..., Ls1n, and Ls3n.

When the selection driver 14 outputs a signal of a non-conduction level to the selection lines Ls11 to Ls1n, the transistor T2 of each of the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn becomes non-conductive.

Further, at this time, since the selection lines Ls11 and Ls31 are connected, the transistor T1 of each of the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn also becomes non-conductive.

When the transistors T1 and T2 of the respective pixels 11_12 to 11_m2, ..., 11_1n to 11_mn become non-conductive, the current supplied from the current supply circuit 121 does not flow to the respective pixels 11_12 to 11_m2, ..., 11_1n to 11_mn.

On the other hand, when the selection driver 14 outputs a signal of the conduction level to the selection line Ls11, the transistor T2 of each of the pixels 11_11 to 11_m1 becomes conductive.

Further, since the selection lines Ls11 and Ls31 are connected, the transistor T2 of each of the pixels 11_11 to 11_m1 is also turned on.

The D/A converter 135-1 sets the first write voltage of the voltage value applied between the gate and the source of the transistor T3 of the pixel 11_11 having a current flowing to the state between the drain and the source of the transistor T3. The drive signal Vd1 outputs the drive signal Vd1 of the first write voltage to the pixel 11_11 when the transistors T1 and T2 of the respective pixels 11_11 to 11_m1 become conductive.

The voltage value of the first voltage is set such that the current value of the current flowing to the pixel 11_11 when the drive signal Vd1 of the first write voltage is written is supplied from the anode circuit 12 when the voltage VEL is measured later. The value of the current value at which the current (current starting value Ie1_0) is large.

On the other hand, the D/A converters 135-2 to 135-m have a gate-source relationship between the gate and the source of the transistor T3 applied to the pixels 11_21 to 11_m1 so that the current does not flow to the drain-source of the transistor T3. The drive signal Vd2 of the second write voltage of the voltage value in the state between the poles. On the other hand, when the transistors T1 and T2 of the respective pixels 11_11 to 11_m1 are turned on, the drive signal Vd2 of the second write voltage is output to the pixels 11_21 to 11_m1. The voltage value of this second write voltage is, for example, 0V.

The control unit 15 controls the switches 131-1 to 131-m to connect the data lines Ld1 to Ldm to the D/A converters 135-1 to 135-m of the data driver 13.

When the data lines Ld1 to Ldm are connected to the D/A converters 135-1 to 135-m of the data driver 13, since the transistor T3 of the pixel 11_11 is turned on, current flows from the ground line 124 of the anode circuit 12 to the anode line. La, the transistor T3 of the pixel 11_11, the transistor T2, and the data line Ld1 flow to the D/A converter 135-1. Since the anode of the organic electroluminescent element 111 becomes a negative potential, it does not cause organic electricity to the pixel 11_11. The light-emitting element 111 flows.

Further, in the data lines Ld2 to Ldm, since the transistor T3 of the pixels 11_21 to 11_m1 is in a non-conducting state, current does not flow. Further, since the anode of the organic electroluminescent element 111 is at the ground potential or the negative potential, the current does not flow to the organic electroluminescent element 111 of the pixel 11_21 to 11_m1.

Since the transistor T1 is turned on, the transistor T3 of the pixel 11_11 is diode-connected and operates in a saturated region, and its operating point becomes the operating point P2 of FIG.

Thus, between the gate and the source of the transistor T3 of the pixel 11_11 of the first column, the voltage value exceeding the threshold value is written, and between the gate and the source of the transistor T3 of the pixel 11_21 to 11_m1, Writes voltage values that do not exceed the threshold.

Next, after the voltage VEL of the pixel 11_11 is measured and the voltage is written in this manner, the control unit 15 controls the switch 123 to supply a current from the current supply circuit 121 to the anode line La as shown in FIG. The current value of the current supplied from the current supply circuit 121 is set to a current value equal to the current start value Iel_0.

Then, the control unit 15 controls the switch driver 17 to output a signal of the conduction level to the gate line Lg1, and outputs a signal of the non-conduction level to the gate line Lg2.

Further, the control unit 15 controls the selection driver 14 to continuously output a signal of the conduction level to the selection line Ls11, and outputs a signal of a non-conduction level to the selection lines Ls12 to Ls1n.

When the switch driver 17 outputs a signal of the conduction level to the gate line Lg1, the transistors T11-1 to T11-n become conductive, and the selection lines Ls31 to Ls3n and the low level line Lm are connected.

When the switch driver 17 outputs a signal of a non-conducting level to the gate line Lg2, the transistors T12-1 to T12-n become non-conductive, and each of the selection lines Ls11 to Ls1n and the selection lines Ls31 to Ls3n are turned off.

Therefore, the signal levels of the selection lines Ls31 to Ls3n become non-conduction levels, and the respective transistors T1 of the pixels 11_11 to 11_ml of the first column become non-conductive.

On the other hand, each of the transistors T2 of the pixels 11_11 to 11_ml of the first column is still turned on.

In this manner, as in the third embodiment, the conduction and non-conduction of the transistors T1 and T2 of the respective pixels 11_ij are individually controlled.

Therefore, as in the third embodiment, the current supplied from the current supply circuit 121 flows only to the organic electroluminescent element 111 of the pixel 11_11, and flows to the ground line 112 via the organic electroluminescent element 111.

The control unit 15 controls the switches 131-1 to 131-m to connect the data lines Ld1 to Ldm and the buffers 132-1 to 132-m, respectively.

The A/D converter 133-1 of the data driver 13 measures the voltage VEL of the organic electroluminescent element 111 via the data line Ld1, the switch 131-1, and the buffer 132-1, and the luminous efficiency extraction portion 136 of the correction circuit 134-1. -1 extracts the luminous efficiency η corresponding to the voltage VEL measured by the A/D converter 133-1, and memorizes it in the memory 137-1.

After the luminous efficiency extracting unit 136-1 stores the luminous efficiency η in the memory 137-1, the control unit 15 controls the selection driver 14, the switch driver 17, and the data driver 13, and sequentially pairs the pixels 11_21, ..., 11_m1. Voltage writing of a voltage value in a state in which a current flows between the drain and the source of the transistor T3 and measurement of each voltage VEL are performed between the gate and the source of the transistor T3, and then, according to the second column to the second column In the order of the n columns, each voltage writing and the measurement of each voltage VEL are sequentially performed for each pixel 11_ij of each column. In this manner, a voltage is written between the gate and the source of the transistor T3 of all the pixels 11_ij to a level between the drain and the source of the transistor T3, and the respective voltages VEL are measured.

In this manner, the display device measures the voltage VEL of the organic electroluminescent element 111 of all the pixels 11_ij, and when the image data is supplied, the current value is corrected based on the measured voltage VEL as in the first embodiment.

Then, the display device writes the drive data Vdata between the gate and the source of the transistor T3 of each of the pixels 11_11 to 11_m1, and causes the organic electroluminescent element 111 of each of the pixels 11_ij to emit light.

As described above, according to the present embodiment, the two selection lines Ls11 to Ls1n and the selection lines Ls31 to Ls3n are connected or disconnected by the transistors T12-1 to T12-n, and the transistor T12- is used. 1~T12-n controls the supply of signals to the non-conducting levels of the selection lines Ls31 to Ls3n.

Therefore, in the present embodiment, as in the third embodiment, the conduction and non-conduction of the transistors T1 and T2 of the respective pixels 11_ij can be individually controlled, and the voltage VEL of the organic electroluminescent element 111 can be measured for each pixel. . Thus, even in the case where the voltage VEL differs for each pixel, the voltage VEL can be correctly measured for each pixel.

Further, in the practice of the present invention, there are various forms and are not limited to the above-described embodiments.

For example, in the above embodiment, the light-emitting element will be described with an organic electroluminescence element. However, the light-emitting element is not limited to an organic electroluminescence element, and may be, for example, an inorganic electroluminescence element or an LED.

In the above-described embodiment, the current is prevented from flowing into the data driver 13, and the buffers 132-1 to 132-m having high impedance are provided. However, as long as the A/D converters 133-1 to 133-m are high-impedance, the buffers 132-1 to 132-m may not be provided.

The relationship between the luminous efficiency and the voltage of the organic electroluminescence device shown in FIG. 2 varies depending on the luminescent material of the organic electroluminescence device, etc., and is not necessarily limited thereto. Further, the LUT shown in FIG. 3 is also the same, and is not necessarily limited to this.

Further, in each of the above-described embodiments, the present invention has been described as being applied to a display device having a light-emitting region in which a plurality of pixels having light-emitting elements are arranged in an array, but the present invention is not limited thereto. For example, it can also be applied to a light-emitting device having a light-emitting element array in which a plurality of pixels having light-emitting elements are arranged in one direction, and is configured to expose light irradiated in accordance with image data to a photoreceptor drum for exposure. Exposure device.

(Fifth Embodiment)

Hereinafter, a light-emitting device according to a fifth embodiment of the present invention will be described with reference to the drawings.

Fig. 16 shows the configuration of a light-emitting device of the present invention.

The light-emitting device of the present embodiment includes a plurality of pixels 11_ij (i = 1 to m, j = 1 to n, m, n: natural numbers), a light-emitting region 10 in which a plurality of pixels 11_ij are arranged, an anode circuit 12, and a data driver ( The data drive unit 13 is configured by a selection driver (selection drive unit) 14 and a control unit 15.

Each of the pixels 11_ij is arrayed in accordance with one pixel corresponding to the image. Each of the pixels 11_ij includes an organic electroluminescent element 111, transistors T1 to T3, and a capacitor (voltage holding unit) C1.

The organic electro-luminescence element 111 is a light-emitting element that emits light by excitons generated by recombination of electrons and holes injected by an organic compound, and corresponds to the supplied current. The brightness of the current value is illuminated.

A pixel electrode is formed on the organic electroluminescent element 111, and a hole injection layer, a light-emitting layer, and a counter electrode (both not shown) are formed on the pixel electrode. The hole injection layer is formed on the pixel electrode and has a function of supplying a hole to the light-emitting layer.

The pixel electrode is made of a conductive material such as ITO (Indium Tin Oxide) or ZnO which is translucent. Each of the pixel electrodes is insulated by an interlayer insulating film (not shown) and pixel electrodes of other adjacent pixels.

The hole injection layer is composed of an organic polymer material that can inject and transport a hole. In addition, as an organic compound-containing liquid containing a hole injection and transport material of an organic polymer system, for example, a PEDOT/PSS aqueous solution which is a polyethylene dioxythiophene (PEDOT) and a doped element which is a conductive polymer is used. The polystyrene sulfonic acid (PSS) of the agent is dispersed in a dispersion of an aqueous solvent.

The light emitting layer is formed on an intermediate layer (not shown). The light-emitting layer has a function of generating light by applying a predetermined voltage between the anode and the cathode.

The light-emitting layer is composed of a polymer light-emitting material which is known to emit fluorescence or light, and the polymer light-emitting material is, for example, a conjugated double-bonded polymer containing a polyparaphenylene system or a polyfluorene system. Red (R), green (G), blue (B) color luminescent materials.

Further, these luminescent materials are a solution (dispersion) which is appropriately dissolved (or dispersed) in an aqueous solvent or an organic solvent such as tetraphosphorus, tetramethylbenzene, trimethylbenzene or xylene by a nozzle coating method or an inkjet method. It is formed by volatilizing a solvent.

Further, in the case of the three primary colors, the RGB luminescent material of the organic electroluminescent element 111 is generally applied to each row.

The counter electrode has a two-layer structure composed of a layer made of a conductive material having a small work function such as Ca or Ba, and a light reflective conductive layer such as Al, and is connected to the ground line 112.

The current flows from the pixel electrode to the opposite electrode and does not flow in the reverse direction, and the pixel electrode and the counter electrode each become an anode and a cathode.

The organic electroluminescent element 111 is driven for a long time by supplying a current, and the characteristics are gradually deteriorated. In other words, when the characteristics of the organic electroluminescent element 111 are deteriorated, the electric resistance increases and the current hardly flows, and the luminance of the emitted current is lowered, and the luminous efficiency is lowered.

That is, in the case where the characteristics of the organic electroluminescent element 111 are deteriorated, in order to obtain the initial luminance, it is necessary to increase the current supplied to the organic electroluminescent element 111. When the current is increased, the voltage VEL between the cathode and the anode of the organic electroluminescent element 111 will also increase.

This brightness has a correlation with the cathode-anode voltage VEL of the organic electroluminescent element 111. Fig. 2 shows the relationship between the luminous efficiency η and the voltage VEL. The luminous efficiency η is an initial luminance (value) when the organic electroluminescent element 111 has a starting characteristic in the case where a fixed current (current starting value Iel_0: detection current) flows to the organic electroluminescent element 111. It is a parameter indicating the change in brightness at 1 o'clock. Therefore, this second graph shows the amount of change in voltage VEL when the luminous efficiency η changes depending on the driving time.

Further, this relationship is obtained by experimentally, and when the organic electroluminescent element 111 has an initial characteristic, the luminance is 5000 cd/m 2 and the luminance per unit area is 16 cd/A, so that the current starting value Iel_0 flows. In the case of the case where the area of the light-emitting portion is set to 100 μm × 300 μm, the current value of the current start value Iel_0 is 5000 × (100 × 300) / 16 = 9.38 (μA).

In view of the relationship between the luminous efficiency η and the voltage VEL, the display device of the present embodiment is configured to measure the voltage (detection voltage) VEL at which the current starting value Iel_0 flows to the organic electroluminescent element 111, and then The current value of the supplied current is corrected based on the voltage VEL, whereby the brightness of the supplied image data is obtained.

The transistors T1 to T3 are TFTs composed of an n-channel type FET (Field Effect Transistor), and are formed of, for example, an amorphous germanium or a multi-turn TFT.

The transistor T1 (write control transistor) is a switching transistor in which the transistor T3 (current control transistor) is turned on and not turned on.

The drain (terminal) of the transistor T1 of each pixel 11_ij is connected to the anode line (power supply line) La.

The gate (terminal) of the transistor T1 of each of the pixels 11_11 to 11_m1 is connected to the selection line Ls11. Similarly, the gates of the transistors T1 of the respective pixels 11_12 to 11_m2 are connected to the selection line Ls12, and the gates of the transistors T1 of the respective pixels 11_1n to 11_mn are connected to the selection line Ls1n.

In the case of the pixel 11_11, when a signal of a high (high) level is output from the selection driver 14 to the selection line Ls11, the transistor T1 is turned on, and the transistor T3 is also turned on.

When the signal of the non-conducting (low) level is output to the selection line Ls11, the transistor T1 becomes non-conductive, and the transistor T3 also becomes non-conductive. At the same time, when the transistor T1 becomes non-conductive, the charge that has charged the capacitor C1 is maintained.

The transistor T2 (selection control transistor) is a switching transistor for selecting to be turned on and off by the selection of the driver 14, so that the anode circuit 12 and the data driver 13 become conductive and non-conductive. The drain of one end of the transistor 11_ij, which is one end of the transistor T2, is connected to the anode of the organic electroluminescent element 111.

The gate of the transistor T2 of each of the pixels 11_11 to 11_m1 is connected to the selection line Ls11. Similarly, the gate of the transistor T2 of each of the pixels 11_12 to 11_m2 is connected to the selection line Ls12, and the gate of the transistor T2 of each of the pixels 11_1n to 11_mn is connected to the selection line Ls1n.

Further, the source of each of the pixels 11_11 to 11_1n as the other end of the transistor T2 is connected to the data line Ld1. Similarly, the source of the transistor T2 of each of the pixels 11_21 to 11_2n is connected to the data line Ld2, and the source of the transistor T2 of each of the pixels 11_m1 to 11_mn is connected to the data line Ldm.

In the case of the pixel 11_11, the transistor T2 becomes conductive when a signal for turning on the level is output from the selection driver 14 to the selection line Ls11, and the anode of the organic electroluminescent element 111 is connected to the data line Ld1.

Further, when a signal of a non-conducting level is outputted to the selection line Ls11, the transistor T2 becomes non-conductive, and the anode of the organic electroluminescent element 111 and the data line Ld1 are cut off.

The capacitor C1 is a capacitor that holds the gate-source voltage Vgs (hereinafter referred to as the gate voltage Vgs) of the transistor T3, and one end thereof is connected to the source of the transistor T1 and the gate of the transistor T3, and the other end is connected. The source of the transistor T3 and the anode of the organic electroluminescent element 111 are connected.

When the transistor T1 becomes conductive, the gate-drain of the transistor T3 is connected, and the diode is connected to become conductive. Therefore, when the current flows from the anode line La to the drain of the transistor T2, the transistor T3 It becomes conductive, and the capacitor C1 is charged with the gate voltage Vgs of the corresponding transistor T3, and the charge is stored.

When the transistors T1 and T2 become non-conductive, the capacitor C1 maintains the gate voltage Vgs of the transistor T3.

The anode circuit 12 has an anode line La at a ground potential when the voltage VEL is measured and a drive signal is written to each of the pixels 11_ij, and the anode is formed when the pixels 11_ij are caused to emit light in response to image data. The line La is set to a predetermined voltage (voltage Vsrc), and is provided with a constant voltage power supply having a switch 122 and an output voltage Vsrc.

The switch 122 switches the voltage Vsrc or the connection of the ground line 124 and the anode line La. This voltage Vsrc is set to, for example, about 12V.

The data driver 13 is an organic electroluminescent element 111 for writing data to each pixel 11_ij, and is provided with switches 1311-1 to 1311-m, current supply circuits 139-1 to 139-m, and an A/D converter ( ADC) 133-1~133-m, correction circuits 134-1~134-m, D/A converters (DAC) 135-1~135-m, and switches 1312-1~1312-m.

The switches 1311-1~1311-m are respectively used to connect the data lines Ld1 to Ldm and the input terminals of the current supply circuits 139-1 to 139-m and the input terminals of the A/D converters 133-1 to 133-m. Connect or cut.

The current supply circuits 139-1 to 139-m supply a constant current to be the detection current. The A/D converters 133-1 to 133-m are each used to measure the voltage VEL applied to the analog lines Ld11 to Ld1n via the switches 1311-1 to 1311-m, and convert the measured analog voltage VEL into Digital voltage VEL. The A/D converters 133-1 to 133-m supply the converted voltage VEL to the correction circuits 134-1 to 134-m.

The correction circuits 134-1 to 134-m are each adapted to the image according to the voltage VEL supplied from the A/D converters 133-1 to 133-m in order to obtain the brightness of the supplied image data. The circuit that drives the value of the data Vdata.

Each of the correction circuits 134-1 to 134-m includes the luminous efficiency extraction units 136-1 to 136-m, the memories 137-1 to 137-m, and the arithmetic units 138-1 to 138- as shown in Fig. 17 . m.

The luminous efficiency extracting sections 136-1 to 136-m each extract and subtract the luminous efficiency η corresponding to the voltage VEL obtained by the measurement, and store the LUT (Look Up Table) as shown in FIG.

This LUT is a table showing the relationship between the voltage VEL, the luminance, and the luminous efficiency η, and is created based on the relationship between the luminous efficiency η and the voltage VEL shown in Fig. 2 .

This LUT is a relationship between the change in luminance, the luminous efficiency η, and the voltage VEL in the case where the current of the current starting value Iel_0 flows to the organic electroluminescent element 111.

This LUT indicates that when the organic electroluminescent element 111 has an initial characteristic, a current of a desired current starting value Iel_0 is flowed in order to obtain a luminance of 5000 cd/m 2 , and when the luminance becomes 3000 cd/m 2 , the luminous efficiency becomes η...=0.60,=3000/5000=0.60, the voltage VEL is increased from the starting value of 7.85V to 8.30V.

Further, in the present embodiment, the LUT is configured to correspond to one current start value Iel_0 (detection current), and one type of detection current corresponding thereto is supplied from the current supply circuits 139-1 to 139-m, but the present invention is not limited thereto. In this way, it is also possible to use a detection current in which the LUT corresponds to a plurality of different current values of two or more levels, and the supply currents from the current supply circuits 139-1 to 139-m are different from the corresponding plurality of levels. The composition of the detected current corresponding to the current value. In this case, the measurement of the voltage VEL is performed plural times in response to the respective detection currents.

The luminous efficiency extracting portions 136-1 to 136-m each refer to the LUT, and extract the luminous efficiency η corresponding to the voltage VEL.

Each of the memories 137-1 to 137-m is a memory (memory circuit) for storing the luminous efficiency extracted by the luminous efficiency extracting portions 136-1 to 136-m.

Each of the computing units 138-1 to 138-m is supplied with image data, and acquires driving data Vdata for obtaining brightness in accordance with the image data.

When the arithmetic units 138-1 to 138-m write each of the drive data Vdata, the luminous efficiency η is read from the memories 137-1 to 137-m.

The arithmetic units 138-1 to 138-m each have a current value Ielf_0 required for the brightness of the supplied image data when the organic electroluminescent element 111 has an initial characteristic, and the slave memory 137-1. The reciprocal of the read luminous efficiency η is multiplied to obtain the current correction value Ielf_1.

Then, the arithmetic units 138-1 to 138-m obtain the drive data Vdata based on the characteristics of the gate voltage of the transistor T3 of each pixel 11_ij, the current between the drain and the source, and the current correction value Ielf_1.

Each of the D/A converters 135-1 to 135-m converts the drive data Vdata obtained by the calculation units 138-1 to 138-m into a write voltage Vd (drive signal: negative voltage).

Each of the D/A converters 135-1 to 135-m applies the write voltage Vd to the other end of the transistor T2 of each of the pixels 11_11 to 11_m1 via the data lines Ld1 to Ldm, whereby via the transistor T2, A current is introduced from the transistor T3.

Each of the switches 1312-1 to 1312-m connects and disconnects the data lines Ld1 to Ldm and the output terminals of the D/A converters 135-1 to 135-m.

The selection driver 14 is controlled by the control unit 15 and is used to select a pixel 11_ij for each column, for example, a shift register. The selection drivers 14 each output a signal having a conduction level or a non-conduction level to the selection lines Ls11 to Ls1n.

The control unit 15 controls each unit. The control unit 15 controls the respective units to correct the current value of the current supplied when the drive signal is written, based on the fluctuation of the voltage VEL of the organic electroluminescent element 111, thereby obtaining the desired luminance.

Thus, the control unit 15 performs a correction step and an image display step.

The correcting step is to measure the voltage VEL of the organic electroluminescent element 111 of each pixel 11_ij, and extract the light corresponding to the measured voltage VEL from the relationship between the voltage VEL and the luminous efficiency η as shown in FIG. 2 measured in advance. The step of efficiency η.

The image display step is to correct the current value according to the luminous efficiency η when the image data is supplied, to obtain the brightness corresponding to the supplied image data, and then write the corresponding driving data Vdata to each pixel 11_ij. A step of causing each of the organic electroluminescent elements 111 to emit light between the gate and the source.

Furthermore, the illumination device performs a measurement of this voltage VEL, for example, at the start of the power supply, every day, or every fixed time.

In the case where the voltage VEL is measured, the control unit 15 controls the anode circuit 12, the data driver 13, and the selection driver 14 to cause the constant current to flow from the current supply circuits 139-1 to 139-m to the organic electroluminescence via the respective pixels 11_ij. The element 111 flows toward the ground line 112.

When writing the drive data Vdata, the control unit 15 controls the anode circuit 12, the data driver 13, and the selection driver 14 so that current does not flow from the anode circuit 12 to the organic electroluminescent element 111 of each pixel 11_ij. The data driver 13 flows.

When the organic electroluminescent element 111 is caused to emit light, the control unit 15 controls the anode circuit 12, the data driver 13, and the selection driver 14 so as to be gate voltage of the transistor T3 written in accordance with the capacitor C1 of each pixel 11_ij. A current is supplied to the organic electroluminescent element 111 by Vgs.

Next, the operation of the light-emitting device of the present embodiment will be described.

First, the operation when the voltage VEL of the organic electroluminescent element 111 of each pixel 11_ij is measured will be described.

The control unit 15 of the light-emitting device controls each unit, selects each pixel 11_ij of each column, and measures the voltage VEL of each of the organic electroluminescent elements 111 in the selected column. In order to measure the voltage VEL, the control unit 15 controls the switch 122 of the anode circuit 12 to connect the anode line La and the ground line 124 as shown in Fig. 18. The control unit 15 can control the anode line La and the cathode of the organic electroluminescent element 111 to have the same potential.

The control unit 15 selects, for example, the pixels 11_11 to 11_ml of the first column. In order to select the pixels 11_11 to 11_ml, the control unit 15 controls the selection driver 14 to output a signal of the conduction level to the selection line Ls11, and outputs a signal of the non-conduction level to the selection lines Ls12 to Ls1n.

When the selection driver 14 outputs a signal of a non-conduction level to the selection lines Ls12 to Ls1n, the transistors T1 and T2 of the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn become non-conductive.

When the transistors T1 of the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn become non-conductive, the transistors T3 are also rendered non-conductive, and current does not flow to the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn.

When the transistors T2 of the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn become non-conducting, when the transistors T1 and T2 of the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn become non-conductive, the pixels 11_12 to 11_m2 are turned on. ..., 11_1n~11_mn is cut off from the data line Ld1~Ldm.

When the selection driver 14 outputs a signal of the conduction level to the selection line Ls11, the transistors T1 and T2 of the pixels 11_11 to 11_m1 become conductive. When each of the transistors T1 is turned on, the gates and the sources of the respective transistors T3 are connected to each other, and the diodes are connected to be turned on.

The control unit 15 controls the switches 1312-1 to 1312-m to cut off the data lines Ld1 to Ldm and the D/A converters 135-1 to 135-m, respectively.

The control unit 15 controls the switches 1311-1 to 1311-m to connect the data line Ld1 and the current supply circuit 139-1 of the data driver 13 and the A/D converter 133-1, respectively, to the data line Ldm and the current. The supply circuit 139-m and the A/D converter 133-m are connected.

Further, in the pixels 11_11 to 11_m1, the cathode of each of the organic electroluminescent elements 111 is grounded, and the anode line La becomes a ground potential.

Therefore, the data line Ld1 is connected to the current supply circuit 139-1 of the data driver 13 and the A/D converter 133-1, and when the constant current is supplied from the current supply circuit 137-1, the source of the transistor T3 of the pixel 11_11 is used. Since the pole is extremely higher than the drain, the current does not flow between the drain and the source of the transistor T3, and the constant current supplied from the current supply circuit 139-1 is supplied from the current supply circuit 139-1 of the data driver 13. The material line Ld1, the transistor T2 of each pixel 11_11, and the organic electroluminescent element 111 flow to the ground line 112. Here, the current value of the constant current supplied from the current supply circuit 139-1 is set to a value equal to the current start value Iel_0 (detection current).

Similarly, when the data line Ld2 and the current supply circuit 139-2 and the A/D converter 133-2, ..., the data line Ldm and the current supply circuit 139-m and the A/D converter 133-m are connected, the constant current is respectively The current supply circuit 139-1 of the data driver 13 flows through the organic electroluminescent element 111 of each of the pixels 11_11 to 11_m1 to the ground line 112.

The A/D converters 133-1 to 133-m of the data driver 13 measure the drain of the transistor T2 via the transistors T1, the data lines Ld1 to Ldm, and the switches 1311-1 to 1311-m of the pixels 11_11 to 11_m1, respectively. The voltage at the junction with the anode of the organic electroluminescent element 111.

This voltage becomes the voltage VEL of the organic electroluminescent element 111. In this manner, the A/D converters 133-1 to 133-m measure the voltage VEL of the organic electroluminescent element 111, respectively.

Further, the on-resistance of each of the transistors T2 of the respective pixels 11_11 to 11_m1 becomes a negligible value because the gate voltage Vgs is high.

The A/D converters 133-1 to 133-m each convert the analog voltage VEL into a digital voltage VEL.

The luminous efficiency extraction units 136-1 to 136-m of the correction circuits 134-1 to 134-m each refer to the LUT, and extract the luminous efficiency η corresponding to the converted voltage VEL. Each of the luminous efficiency extracting portions 136-1 to 136-m stores the extracted luminous efficiency η in the memory bodies 137-1 to 137-m.

When the luminous efficiency extraction portions 136-1 to 136-m each store the extracted luminous efficiency η in the memory 137-1 to 137-m, the control unit 15 selects the pixels 11_12 to 11_m2 in the second column.

In order to select the pixels 11_12 to 11_m2 of the second column, the control unit 15 controls the selection driver 14 to output a signal of the conduction level to the selection line Ls12, and outputs a signal of a non-conduction level to the selection lines Ls11 and Ls13 to Ls1n.

When the selection driver 14 outputs a signal of a non-conduction level to the selection lines Ls11 and Ls13 to Ls1n, the transistors T1 and T2 of the pixels 11_11 to 11_m1, 11_13 to 11_m3, ..., 11_1n to 11_mn become non-conductive.

When the transistors T1 and T2 become non-conductive, the current does not flow to the pixels 11_11 to 11_m1, 11_13 to 11_m3, ..., 11_1n to 11_mn, and is cut off from the data lines Ld1 to Ldm.

Further, when the selection driver 14 outputs a signal of the conduction level to the selection line Ls12, the transistors T1 and T2 of the pixels 11_12 to 11_m2 become conductive. When the transistor T1 becomes conductive, the transistor T3 also becomes conductive.

The current flows from the current supply circuits 139-1 to 139-m of the data driver 13 to the organic electroluminescent element 111 via the data lines Ld1 to Ldm and the transistors T2 of the respective pixels 11_12 to 11_m2.

The A/D converters 133-1 to 133-m of the data driver 13 measure the organic electroluminescent element 111 via the respective transistors T2, the data lines Ld1 to Ldm, and the switches 1311-1 to 1311-m of the pixels 11_12 to 11_m2. The voltage VEL is converted to a digital voltage VEL.

The luminous efficiency extraction units 136-1 to 136-m of the correction circuits 134-1 to 134-m each refer to the LUT, and extract the light corresponding to the converted voltage VEL of the A/D converters 133-1 to 133-m. The efficiency η is then stored in the memory 137-1 to 137-m.

The control unit 15 controls the respective units so that the pixels 11_13 to 11_m3, ..., 11_1n to 11_mn are selected, and the voltage VEL of the organic electroluminescent element 111 is measured for each column.

Next, an operation when the organic electroluminescent element 111 for driving each pixel 11_ij is displayed in accordance with the driving data will be described.

When the image data is supplied, the light-emitting device writes the drive data Vdata to each of the pixels 11_11 to 11_mn. Similarly to the case of measuring the voltage VEL, the control unit 15 controls the switch 122 of the anode circuit 12 to connect the anode line La and the ground line 124, and the anode line La becomes a ground potential as shown in Fig. 19.

The control unit 15 controls the switches 1311-1 to 1311-m to supply the data lines Ld1 to Ldm, the current supply circuits 139-1 to 139-m of the data driver 13, and the A/D converters 133-1 to 133, respectively. m cut off.

Next, the control unit 15 selects the pixels 11_11 to 11_m1 of the first column. In order to select the pixels 11_11 to 11_m1, the control unit 15 controls the selection driver 14 to output a signal of a non-conduction level to the selection lines Ls12 to Ls1n, respectively, and outputs a signal of a conduction level to the selection line Ls11.

Further, when the selection driver 14 outputs a signal of a non-conduction level to the selection lines Ls12 to Ls1n, the transistors T1 and T2 of the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn become non-conductive.

When the transistors T1 and T2 become non-conductive, the transistors T3 are also rendered non-conductive, and current does not flow to the pixels 11_12 to 11_m2, ..., 11_1n to 11_mn, and the data lines Ld1 to Ldm are cut off.

When the selection driver 14 outputs a signal of the conduction level to the selection line Ls11, the transistors T1 and T2 of the pixels 11_11 to 11_m1 become conductive. When each of the transistors T1 is turned on, each of the transistors T3 is also turned on.

The calculation units 138-1 to 138-m of the correction circuits 134-1 to 134-m read out the luminous efficiency η of the pixels 11_11 to 11_m1 from the memories 137-1 to 137-m.

Then, in order to obtain the brightness corresponding to the supplied image data, the calculation units 138-1 to 138-m correct the current value based on the read luminous efficiency η, and obtain the driving data Vdata based on the current correction value. .

Each of the D/A converters 135-1 to 135-m of the data driver 13 converts the drive data Vdata obtained by the arithmetic units 138-1 to 138-m into a write voltage Vd of a negative analog voltage.

The control unit 15 controls the switches 1312-1 to 1312-m to connect the data lines Ld1 to Ldm and the D/A converters 135-1 to 135-m.

When the data lines Ld1 to Ldm and the D/A converters 135-1 to 135-m are connected to each other, the D/A converters 135-1 to 135-m respectively apply a write voltage Vd of a negative voltage to the data lines Ld1 to Ldm. .

In the pixels 11_11 to 11_m1, the cathode of each of the organic electroluminescent elements 111 is grounded, and since the anode line La also becomes a ground potential, current does not flow from the anode circuit 12 to the organic electroluminescent element 111.

Further, since the write voltage Vd is a negative voltage, the current flows from the anode circuit 12 to the D/A converter 135- via the anode line La, the transistors T3 and T2 of the pixels 11_11 to 11_m1, and the data lines Ld1 to Ldm. 1~135-m flow.

Since the transistors T1 of the pixels 11_11 to 11_m1 become conductive, the respective transistors T3 are connected by a diode. Therefore, as shown in FIG. 6, the transistor T3 operates in the saturation region as indicated by the operating point P2, and flows to the transistor T3 in response to the diode current of the diode.

The transistor T1 becomes conductive, because the drain current Id flows toward the transistor T3, so the gate voltage Vgs of the transistor T3 is set to a voltage corresponding to the drain current Id, and the gate voltage Vgs is used to conduct the capacitor C1. Charging.

In this manner, in order to obtain the brightness of the supplied image data, writing is performed between the gate and the source of each of the transistors T3 of the pixels 11_11 to 11_m1 with a current value corrected based on the voltage VEL.

Next, the control unit 15 selects the pixels 11_12 to 11_m2 in the second column. In order to select the pixels 11_12 to 11_m2, the control unit 15 controls the selection driver 14 to output signals of non-conduction levels to the selection lines Ls11 and Ls13 to Ls1n, respectively, and outputs a signal of the conduction level to the selection line Ls12.

When the selection driver 14 outputs a signal of a non-conduction level to the selection lines Ls11 and Ls13 to Ls1n, the transistors T1 and T2 of the pixels 11_11 to 11_m1, 11_13 to 11_m3, ..., 11_1n to 11_mn become non-conductive.

When the transistors T1 and T2 of the pixels 11_11 to 11_m1 become non-conductive, the gate voltage Vgs of the transistor T3 is held at the voltage that has been written to the capacitor C1.

When the selection driver 14 outputs a signal of the conduction level to the selection line Ls12, the transistors T1 and T2 of the pixels 11_12 to 11_m2 become conductive. When the transistor T1 becomes conductive, the transistor T3 also becomes conductive.

The calculation units 138-1 to 138-m of the correction circuits 134-1 to 134-m read out the luminous efficiency η of the pixels 11_12 to 11_m2 from the memories 137-1 to 137-m, and correct the current values to obtain The drive data Vdata is obtained based on the corrected current value in response to the brightness of the supplied image data.

Each of the D/A converters 135-1 to 135-m of the data driver 13 converts the drive data Vdata obtained by the arithmetic units 138-1 to 138-m into a write voltage Vd of a negative analog voltage.

Then, the data driver 13 writes the drive data Vdata between the gate and the source of the transistor T3 of the selected pixel 11_12 to 11_m2 with the write voltage Vd.

In this manner, the control unit 15 sequentially selects the pixels 11_13 to 11_m3, ..., 11_1n to 11_mn.

When such writing is performed on all of the pixels 11_ij, the control unit 15 controls the respective units to cause the organic electroluminescent elements 111 of the respective pixels 11_ij to emit light.

As shown in Fig. 20, the control unit 15 controls the switch 122 of the anode circuit 12 to connect the anode line La and the power source of the voltage Vsrc.

The control unit 15 continuously controls the switches 1311-1 to 1311-m to supply the data lines Ld1 to Ldm, the current supply circuits 139-1 to 139-m of the data driver 13, and the A/D converters 133-1 to 133- m cut off.

The control unit 15 controls the switches 1312-1 to 1312-m to cut off the data lines Ld1 to Ldm and the D/A converters 135-1 to 135-m, respectively.

The selection driver 14 outputs a signal of a non-conduction level to the selection lines Ls11 to Ls1n. When the selection driver 14 outputs a signal of a non-conduction level to the selection lines Ls11 to Ls1n, the transistors T1 and T2 of all the pixels 11_ij become non-conductive.

All of the pixels 11_ij are cut off from the data lines Ld1 to Ldm because the transistors T2 become non-conductive.

However, since the drive data Vdata is written between the gate and the source of the transistor T3 of all the pixels 11_ij, current flows to the respective transistors T3.

Therefore, when the voltage Vsrc is applied, a current flows from the anode circuit 12 to the organic electroluminescent element 111 via the anode line La and the respective transistors T3 of the respective pixels 11_ij.

Fig. 6 is a view showing the drain-source-to-source voltage Vds of the transistor T3 versus the drain-source current Ids characteristic and the load line SPe1 of the organic electroluminescent element 111. Since the gate voltage Vgs of the transistor T3 of each pixel 11_ij is held by the capacitor C1, the operating point of the transistor T3 becomes the action line and the organic electroluminescent element which are the held gate voltage Vgs as shown in FIG. The operating point P3 of the intersection of the load line SPe1 of 111. The voltage value of the voltage Vsrc is set to a voltage value at which the operating point P3 is in a state in which the transistor T3 operates in the saturation region.

In addition, in Fig. 6, P0 is the pinch point, Vth is the threshold voltage, and the region from the 0V to the pinch-off voltage of the drain-source voltage Vds is an unsaturated region, and the drain-source voltage is The area above the clamping voltage of Vds is the saturated area.

On the other hand, the drain current Id of the current value which is the same as the write current when the drive data Vdata is written flows between the gate and the source of the transistor T3. The transistor T2 is rendered non-conductive, and since the potential on the anode side of the organic electroluminescent element 111 is higher than the potential on the cathode side, the gate current Id is supplied to the organic electroluminescent element 111.

At this time, the current flowing to the organic electroluminescent element 111 of each pixel 11_ij is corrected based on the measured voltage VEL.

For example, in the case of the organic electroluminescent element 111 of the pixel 11-11, the luminance measured by the organic electroluminescent element 111 is 8.30 V in response to the luminance of the supplied image data being 5000 cd/m 2 . If not corrected, the brightness is reduced to 3000 cd/m 2 .

In this case, the luminous efficiency extracting unit 136-1 refers to the LUT shown in FIG. 4, and obtains the luminous efficiency η=0.6 from the voltage VEL=8.30V.

The calculation unit 138-1 refers to the memory 137-1 and obtains η=0.6 as a current value for obtaining a luminance of 5000 cd/m 2 , and sets the current start value Iel_0 to 1/η=1.67 times to obtain a current correction value. Iel_1.

In other words, the current of 1.67 times the current starting value Iel_0 is corrected to flow to the organic electroluminescent element 111 of the pixel 11_11, and as a result, the organic electroluminescent element 111 emits light at a luminance of 5000 cd/m 2 .

As described above, according to the present embodiment, the control unit 15 turns on the transistors T1 and T2 whose respective columns are controlled so that the respective pixels 11_ij are turned on, and then controls the respective components so that the constant current is supplied from the data driver 13 to the respective pixels 11_ij. The organic electroluminescent element 111 is measured and the voltage VEL of the organic electroluminescent element 111 is measured.

Further, in order to obtain the brightness of the supplied image data, the data driver 13 corrects the current value based on the measured voltage VEL, and writes the driving data between the gate and the source of the transistor T3 of each pixel 11_ij. Vdata.

Therefore, the characteristic variation of the organic electroluminescent element 111 of each pixel 11_ij can be compensated.

Further, the display driving means is configured to arrange RGB organic electroluminescent elements 111 for each row, and measure the voltage VEL for each row.

As described above, in the case of the RGB three primary colors, RGB luminescent materials are generally applied to each row. If the materials of the organic electroluminescent elements 111 are different, the degree of deterioration is also different. However, by measuring the voltage VEL for each column, it is not necessary to consider the difference of such materials, and the voltage VEL of the organic electroluminescent element 111 produced by the same material can be measured.

Moreover, even when the characteristics are changed due to uneven coating of the luminescent material, the characteristic variation of the organic electroluminescent element 111 of each pixel 11_ij can be compensated.

The resistance of the luminescent material is different from that of the metal, which is almost as high as that of the semiconductor. When the luminescent material is unevenly coated, the variation in the thickness of the applied luminescent material also affects the characteristics of the organic electroluminescent element 111.

However, in order to measure the voltage VEL of each of the organic electroluminescent elements 111 at the time of manufacture, shipment, etc., and obtain the brightness of the supplied image data, the current value can be corrected by correcting the current value according to the measured voltage VEL. The characteristics of the organic electroluminescent element 111 of each pixel 11_ij vary.

Further, in the practice of the present invention, there are various forms and are not limited to the above-described embodiments.

For example, in the above embodiment, the light-emitting element will be described with an organic electroluminescence element. However, the light-emitting element is not limited to an organic electroluminescence element, and may be, for example, an inorganic electroluminescence element or an LED.

The relationship between the luminous efficiency and the voltage of the organic electroluminescence device shown in Fig. 2 varies depending on the luminescent material of the organic electroluminescence device, etc., and is not necessarily limited thereto. Further, the LUT shown in Fig. 1 is also the same, and is not limited to this.

Further, in each of the above-described embodiments, the present invention has been described as being applied to a display device having a light-emitting region in which a plurality of pixels having light-emitting elements are arranged in an array, but the present invention is not limited thereto. For example, it can also be applied to a light-emitting device having a light-emitting element array in which a plurality of pixels having light-emitting elements are arranged in one direction, and is configured to emit light that emits light in response to image data onto a photoreceptor drum for exposure. Exposure device.

In addition, with regard to the present patent application, the priority based on Japanese Patent Application No. 2009-38663 and Japanese Patent Application No. 2008-92020 is hereby incorporated by reference.

10. . . Luminous area

11_11~11_mn. . . Pixel

12. . . Anode circuit

13. . . Data driver

14. . . Select drive

15. . . Control department

16. . . 2nd choice drive

17. . . Switch driver

111. . . Organic electroluminescent element

112. . . Ground wire

121. . . Current supply circuit

122, 123. . . switch

124. . . Ground wire

134-1~134-m. . . Correction circuit

131-1~131-m. . . switch

132-1~132-m. . . buffer

133-1~133-m. . . A/D converter

135-1~135-m. . . D/A converter

136-1~136-m. . . Luminous efficiency extraction

137-1~137-m. . . Memory

138-1~138-m. . . Computing department

139-1~139-m. . . Current supply circuit

La. . . Anode line

T1~T3. . . Transistor

C1. . . Capacitor

Ld1~Ldm. . . Data line

Ls11~Ls1n. . . Selection line

Vsrc. . . Voltage

VEL. . . Voltage

Fig. 1 is a view showing the configuration of a display device according to a first embodiment of the present invention.

Fig. 2 is a graph showing the relationship between the luminous efficiency and the voltage of the organic electroluminescence device.

Fig. 3 is a view showing the configuration of a correction circuit shown in Fig. 1.

Fig. 4 is a view showing an LUT (Look Up Table) stored in the luminous efficiency extracting unit shown in Figs. 3 and 17 .

Fig. 5 is a view showing a voltage measuring operation (in the case of one line averaging) of the organic electroluminescent element in the display device shown in Fig. 1.

Fig. 6 is a view showing an operation region (a relationship between a drain voltage and a drain current) of the transistor shown in Figs. 1 and 16.

Fig. 7 is a view showing a write operation for display operation of the display device shown in Fig. 1.

Fig. 8 is a view showing a light-emitting operation of the display device shown in Fig. 1 during a display operation.

FIG. 9 is a view showing a voltage measurement operation (in the case of one column average) of the organic electroluminescence device in the display device according to the second embodiment of the present invention.

Fig. 10 is a view showing the configuration of a display device according to a third embodiment of the present invention.

Fig. 11 is a view showing a voltage writing operation for measuring the voltage of the organic electroluminescent element for each pixel in the display device shown in Fig. 10.

Fig. 12 is a view showing the operation of measuring the voltage of the organic electroluminescent element for each pixel in the display device shown in Fig. 10.

Figure 13 is a view showing the configuration of a display device according to a fourth embodiment of the present invention.

Fig. 14 is a view showing a voltage writing operation for measuring the voltage of the organic electroluminescent element for each pixel in the display device shown in Fig. 13.

Fig. 15 is a view showing the operation of measuring the voltage of the organic electroluminescent element for each pixel in the display device shown in Fig. 13.

Figure 16 is a block diagram showing the configuration of a light-emitting device according to a fifth embodiment of the present invention.

Fig. 17 is a view showing the configuration of a correction circuit shown in Fig. 16.

Fig. 18 is a view showing a voltage measuring operation of the organic electroluminescence device shown in Fig. 16.

Fig. 19 is a view showing a writing operation of the light-emitting device shown in Fig. 16.

Fig. 20 is a view showing a light-emitting operation of the light-emitting device shown in Fig. 16.

10. . . Luminous area

11_11~11_mn. . . Pixel

12. . . Anode circuit

13. . . Data driver

14. . . Select drive

15. . . Control department, image data

111. . . Organic electroluminescent element

112. . . Ground wire

121. . . Current supply circuit

122, 123. . . switch

124. . . Ground wire

131-1~131-m. . . switch

132-1~132-m. . . buffer

133-1~133-m. . . A/D converter

134-1~134-m. . . Correction circuit

135-1~135-m. . . D/A converter

La. . . Anode line

T1~T3. . . Transistor

C1. . . Capacitor

Ld1~Ldm. . . Data line

Ls11~Ls1n. . . Selection line

Vsrc. . . Voltage

Claims (29)

  1. A light-emitting device comprising: a power line; at least one data line; at least one pixel having: a light-emitting element, one end electrically connected to the power line, and the other end being set to a predetermined potential; a transistor for connecting the data line to one end of the light-emitting element; a current supply circuit for outputting a detection current of a preset current value; and a data driving unit having a voltage measurement circuit via the data line and A current path of the first transistor of the pixel acquires a voltage of the detection current from the current supply circuit via the power supply line and flows from one end of the light-emitting element to the other end of the light-emitting element as a detection Voltage.
  2. The light-emitting device of claim 1, wherein the data driving unit includes: a correction circuit that corrects driving of image data supplied from the outside based on the detection voltage obtained by the voltage measuring circuit And the driving signal supply circuit generates a driving signal according to the modified driving data.
  3. The illuminating device of claim 2, wherein the correction circuit is provided with: a luminous efficiency extraction portion having a memory circuit that pre-stores a relationship between luminous efficiency and voltage, and the luminous efficiency indicates that the detection is performed a ratio of a luminance of the initial luminance when the light-emitting element has a starting characteristic, the voltage is a voltage between the two ends of the light-emitting element when the light-emitting element flows, and And extracting, according to the relationship between the luminous efficiency stored in the memory circuit and the voltage between the two ends of the light-emitting element, the value of the luminous efficiency corresponding to the detection voltage measured by the voltage measuring circuit; and the calculating unit The driving data is calculated by the value of the luminous efficiency extracted by the luminous efficiency extracting portion, and the driving data is corrected.
  4. The illuminating device of claim 3, wherein the illuminating device has a illuminating region in which a plurality of the pixels are arranged; the voltage measuring circuit of the data driving portion is controlled to obtain the plurality of pixels corresponding to the illuminating region The detected voltage of one pixel.
  5. The illuminating device of claim 4, wherein the pixel is arranged in the illuminating region, and the plurality of strips are arranged along the column direction and the row direction; the data line is disposed along the row direction of the illuminating region; The illuminating device has a plurality of selection lines, which are orthogonal to the data lines and arranged in a plurality of strips in the column direction, and are connected to the pixels; and a driving unit is selected for each of the selection lines Applying a selection signal, and setting each pixel corresponding to each selection line to a selected state; Each of the pixels is arranged in an array shape near the intersection of the data lines and the selection lines, and has a second transistor, one end of the current path is connected to the power line, and the other end of the current path and the light-emitting element One end is connected, and the power line is electrically connected to one end of the light emitting element; and the voltage holding portion holds a voltage between the control terminal of the second transistor and the other end of the current path; the driving signal is supplied to the circuit Before the detection current flows through the light-emitting element, the first write voltage as the drive signal is applied to the one pixel that obtains the detection voltage in the column in which the selection drive unit is in the selected state, and has a current a current value larger than the detected current flows in a current value required for the current path of the second transistor, and the second transistor is turned on, and the selected drive unit is set to a selected state. The pixel other than the one pixel that acquires the detection voltage applies a second write voltage as the drive signal, and has a voltage value in a state in which the second transistor is in a non-conduction state.
  6. The illuminating device of claim 5, wherein each of the pixels has a third transistor, one end of the current path is connected to the power line, and the other end of the current path is connected to a control terminal of the second transistor; The strip selection line has a first selection line connected to a control terminal of the third transistor of each pixel, and a plurality of columns arranged in a column direction; and a second selection line and the first of the pixels The control terminals of the transistor are connected, and a plurality of strips are arranged in the column direction; The selection drive unit includes: a first selection drive unit that applies a first selection signal to each of the first selection lines; and a second selection drive unit that applies a second selection signal to each of the second selection lines; The first transistor and the third transistor system are individually set to be in an on state by the first selection drive unit and the second selection drive unit.
  7. The illuminating device of claim 5, wherein each of the pixels has a third transistor, one end of the current path is connected to the power line, and the other end of the current path is connected to a control terminal of the second transistor; The strip selection line has a first selection line connected to a control terminal of the first transistor of each pixel, and a plurality of columns arranged in a column direction; and a second selection line and the third of the pixels The control terminals of the transistor are connected, and a plurality of strips are arranged in the column direction. The selection drive unit includes: a first selection drive unit that applies a first selection signal to each of the first selection lines; and a second selection drive unit. The switch circuit includes a switch circuit and a switch drive circuit, and the switch circuit includes a plurality of switching elements that apply a second selection signal according to the first selection signal to each of the second selection lines, and the switch drive circuit controls the switch. The operation of each of the transistors of the circuit; the first transistor and the third transistor system are individually set to be in an on state by the first selection drive unit and the second selection drive unit.
  8. The light-emitting device of claim 7, wherein the switch circuit has: a plurality of first switching elements, which are provided corresponding to the respective columns of the light-emitting regions, and connect one end of the current path to the second selection line, The other end of the current path is set to a predetermined potential; a plurality of second switching elements are provided corresponding to the respective columns of the light-emitting regions, and the first ends of the current paths and the pixels of the respective columns are connected to the first The selection line is connected to the second selection line; the first control signal line is connected in common to the control terminals of the respective first switching elements; and the second control signal line is common to the control terminals of the second switching elements. The switch driver circuit individually applies a control signal to the first control signal line and the second control signal line, and controls conduction between the first switching element and each of the second switching elements.
  9. The illuminating device of claim 3, wherein the illuminating device has a illuminating region in which a plurality of the pixels are arranged; the plurality of pixels are arranged in an array in the illuminating region along the column direction and the row direction. The data line is disposed along a row direction of the light-emitting region; the current output from the current supply circuit flows simultaneously with the light-emitting elements of all the pixels of the light-emitting region; The voltage measuring circuit is configured to correspond to each of the plurality of data lines, and the voltage measuring circuits are along The light-emitting region is disposed in a row direction, and an average value of the detected voltages of the plurality of pixels connected to each of the plurality of data lines is obtained.
  10. The illuminating device of claim 5, wherein the illuminating device has a illuminating region in which a plurality of the pixels are arranged; the plurality of pixels are arranged in an array in the column region and the row direction in the illuminating region The data line is provided with a plurality of strips along the row direction; the current output from the current supply circuit flows simultaneously with the plurality of pixels arranged along any one of the light-emitting regions; the data drive The voltage measuring circuit of the portion is provided corresponding to each of the plurality of data lines, and the voltage measuring circuits simultaneously obtain the detection voltage of the pixels disposed in the column of the light emitting region.
  11. A display device having the following components: a power line; a plurality of data lines; and a plurality of pixels having: a light-emitting element connected to any one of the plurality of data lines, one end electrically connected to the power line, and the other One end is set to a predetermined potential; and the first transistor is connected to each of the data lines and one end of the light-emitting element; and the current supply circuit outputs a detection current of the preset current value. And a data driving unit having: a voltage measuring circuit for obtaining the detection current from the current supply circuit via the data line and a current path of the first transistor of the pixel of at least one of the plurality of pixels; The voltage of the one end of the light-emitting element flowing from one end of the light-emitting element to the other end through the power supply line is used as a detection voltage; and the correction circuit is corrected based on the detection voltage obtained by the voltage measurement circuit The drive signal is generated in response to the image data supplied from the outside; and the drive signal supply circuit generates a drive signal based on the modified drive data.
  12. The display device of claim 11, wherein the correction circuit is provided with: a luminous efficiency extraction portion having a memory circuit that preliminarily stores a relationship between luminous efficiency and voltage, and the luminous efficiency indicates that the detection current is in the When the light-emitting element flows, corresponding to a brightness ratio of the initial brightness when the light-emitting element has an initial characteristic, the voltage is a voltage between the two ends of the light-emitting element when the detection current flows in the light-emitting element, and according to the memory And the relationship between the luminous efficiency and the voltage between the two ends of the light-emitting element, and the value of the luminous efficiency corresponding to the detection voltage measured by the voltage measuring circuit; and the calculating unit The driving data is calculated by calculating the value of the luminous efficiency extracted by the efficiency extracting portion, and the driving data is corrected.
  13. The display device of claim 12, wherein the display device has a plurality of light emitting regions arranged with the plurality of pixels; the voltage measuring circuit of the data driving portion is controlled to sequentially obtain the plurality of corresponding light emitting regions The detected voltage of each of the pixels of the pixel.
  14. The display device of claim 12, wherein the display device has a light-emitting region in which the plurality of pixels are arranged in an array along the column direction and the row direction; the data line is arranged along the row direction of the light-emitting region. a plurality of strips; the current output from the current supply circuit flows simultaneously with the light-emitting elements of all the pixels of the light-emitting region; the voltage measuring circuit of the data driving portion corresponds to each of the plurality of data lines A plurality of voltage measuring circuits are disposed along the row direction of the light emitting region, and an average value of the detected voltages of the plurality of pixels connected to each of the plurality of data lines is obtained.
  15. The display device of claim 12, wherein the display device has a light-emitting region in which the plurality of pixels are arranged in an array in the column direction and the row direction; the data line is disposed in the row direction; The current output by the current supply circuit flows simultaneously with the plurality of pixels disposed along any one of the light-emitting regions; The voltage measuring circuit of the data driving unit is provided in plurality corresponding to each of the plurality of data lines, and the voltage measuring circuits simultaneously obtain the detection voltage of the pixels arranged in the column of the light emitting region.
  16. A driving control method for a light-emitting device, which drives a light-emitting device having a light-emitting element, the light-emitting device having: a power line; at least one data line; at least one pixel having: a light-emitting element, one end electrically connected to the power line And the other end is set to a predetermined potential; and the first transistor is connected to the data line and one end of the light emitting element; and the current supply circuit outputs a detection current having a preset current value; The driving control method of the device includes a flow step of causing the detection current to flow from the current supply circuit through the power supply line from one end of the light emitting element to the other end, and the obtaining step of the data line and the first The current path of the transistor obtains a voltage of the one end of the light-emitting element when the detection current flows from one end to the other end of the light-emitting element as a detection voltage.
  17. The driving control method of the light-emitting device of claim 16, comprising: a correcting step of correcting driving data corresponding to the image data supplied from the outside based on the obtained value of the detected voltage; and supplying step A drive signal is generated based on the corrected drive data, and is supplied to the pixel via the data line.
  18. For example, the driving control method of the illuminating device of claim 17 The step of correcting the driving data includes: an extracting step, wherein the memory circuit pre-memorizes the relationship between the luminous efficiency and the voltage, and the luminous efficiency indicates that the detecting current has a starting characteristic corresponding to the light emitting element when the detecting current flows. a brightness ratio of the initial brightness of the time, the voltage is a voltage between the two ends of the light-emitting element when the detecting current flows, and the luminous efficiency stored in the memory circuit and the two ends of the light-emitting element And a value of the luminous efficiency corresponding to the detection voltage obtained by the step of obtaining a voltage at one end of the light-emitting element; and a correcting step of performing the driving data according to the extracted luminous efficiency Calculate and correct the driver data.
  19. The driving control method of a light-emitting device according to claim 16, wherein the light-emitting device has a plurality of light-emitting regions in which the pixels are arranged in a column direction and a row direction; and the detection current is made from one end of the light-emitting element a step of flowing the other end, wherein the detection current outputted from the current supply circuit flows in the light-emitting element of the pixel located in the plurality of pixels of the light-emitting region; and the step of obtaining the voltage at one end of the light-emitting element includes There is a measuring step of sequentially measuring the detected voltage of each pixel of the plurality of pixels arranged in the light emitting region.
  20. For example, the driving control method of the light-emitting device of claim 16 is The light-emitting device has a plurality of light-emitting regions arranged in the column direction and the row direction, wherein the data lines are arranged in a plurality of rows along the row direction; and the detection current is caused to flow from one end of the light-emitting element to the other end. The step of outputting the detection current from the current supply circuit to the light-emitting element of the pixel of the light-emitting region simultaneously; the step of obtaining the voltage at one end of the light-emitting element includes a measuring step, and the measuring edge thereof An average value of the detected voltages of the plurality of pixels arranged in the row direction of the light-emitting region.
  21. The driving control method of the illuminating device of claim 16, wherein the illuminating device has a plurality of illuminating regions arranged in the column direction and the row direction, and the data lines are arranged in the row direction; a step of flowing the detection current from one end of the light-emitting element to the other end, wherein the detection current output from the current supply circuit is the illumination of the plurality of pixels disposed along any one of the light-emitting regions The element flows simultaneously; the step of obtaining the voltage at one end of the light-emitting element includes a obtaining step of simultaneously obtaining the detected voltage of the pixels arranged in the column of the light-emitting region.
  22. A light-emitting device having a pixel having a light-emitting element: having a light-emitting region arranged in a column direction and a row direction a plurality of pixels are arranged in the vicinity of each intersection of the plurality of selection lines and the data lines; and the data driving unit generates a driving signal corresponding to the image data supplied from the outside, and the respective signals are transmitted to the respective a pixel supply; each of the pixels has a current control transistor, one end of the current path is connected to the power line, the other end of the current path is connected to one end of the light emitting element, and controls a current flowing to the light emitting element; and selection control a transistor, wherein one end of the current path is connected to the data line, and the other end of the current path and the other end of the current path of the current control transistor are connected to a connection point of the light emitting element, and the control terminal is connected to the selection line; The driving unit has: a plurality of current supply circuits for supplying a predetermined detection current to each of the plurality of data lines; and a plurality of voltage measurement circuits for measuring the detection current from the respective ones via the selection control transistor The current supply circuit controls the current path of the transistor via the selection of the pixels, between the terminals of the light-emitting elements when the light-emitting elements flow Pressure, and as a detection voltage.
  23. The illuminating device of claim 22, wherein the illuminating device further comprises a selective driving unit that applies a selection signal to each of the selection lines, and sets the pixels of each column to a selected state; the data driving unit is paired The detection voltage is measured by the pixel in which the selection drive unit is set to the selected state.
  24. The illuminating device of claim 23, wherein the data driving unit is provided with: a correction circuit, which is measured according to the voltage measuring circuit The detection voltage is corrected, and the driving data corresponding to the image data is corrected; and the driving signal supply circuit generates the driving signal based on the modified driving data.
  25. The light-emitting device of claim 24, wherein the correction circuit has a luminous efficiency extraction portion having a memory circuit that pre-stores a relationship between luminous efficiency and voltage, and the luminous efficiency indicates that the detection current is in the light-emitting element When flowing, corresponding to a luminance ratio of an initial luminance when the light-emitting element has an initial characteristic, the voltage is a voltage between the two ends of the light-emitting element when the detection current flows in the light-emitting element, and according to the memory circuit The relationship between the luminous efficiency of the memory and the voltage across the light-emitting element, and the value of the luminous efficiency corresponding to the detected voltage measured by the voltage measuring circuit is extracted.
  26. The illuminating device of claim 25, wherein the correction circuit includes a computing unit that calculates the driving data based on the value of the luminous efficiency extracted by the luminous efficiency extracting unit to correct the driving data.
  27. A driving control method for a light-emitting device, the light-emitting device having a pixel including a light-emitting device, wherein the plurality of pixels are arranged in a plurality of selection lines and data lines arranged in a column direction and a row direction in a light-emitting region In the vicinity of each intersection, the pixel has a current control transistor, one end of the current path is connected to the power line, and the other end of the current path is connected to one end of the light emitting element to control the current flowing to the light emitting element; And election Selecting a control transistor, one end of the current path is connected to the data line, and the other end of the current path and the other end of the current path of the current control transistor are connected to the connection point of the light emitting element, and the control terminal and the selection a line connection; the driving control method of the illuminating device includes: a flow step of supplying a predetermined detection current to each of the plurality of data lines, and causing the detection current to pass through the pixels selected as a selected state Selecting a current path for controlling the transistor to flow in each of the light-emitting elements; and measuring a step of measuring a voltage between the terminals of the light-emitting elements via the selection control transistor as a detection voltage; and correcting the step according to the detection The detection voltage is corrected, and the driving data corresponding to the image data supplied from the outside is corrected.
  28. The driving control method of the illuminating device of claim 27, wherein the step of modifying the driving data comprises: extracting a step of pre-memorizing a relationship between luminous efficiency and voltage, wherein the luminous efficiency indicates that the detecting current is in the illuminating When the component flows, corresponding to a luminance ratio of the initial luminance when the light-emitting component has an initial characteristic, the voltage is a voltage between the two ends of the light-emitting component when the detection current flows in the light-emitting component, and according to the luminous efficiency And a relationship between a voltage between both ends of the light-emitting element, and extracting a value of the luminous efficiency corresponding to the measured detection voltage; and a correcting step of correcting the response according to the extracted luminous efficiency The driving data of the image data.
  29. The driving control method of the illuminating device of claim 27, wherein, in the step of flowing the detecting current, the detecting current is simultaneously flowed in the light-emitting elements of the pixels in any one of the selected states; In the step of measuring the detected voltage, the measurement of the detected voltage of the pixels arranged in the column of the display panel is simultaneously performed.
TW98110355A 2008-03-31 2009-03-30 Light-emtting device, display device, and method for controlling driving of the light-emitting device TWI407826B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2008091882 2008-03-31
JP2008092020A JP4877261B2 (en) 2008-03-31 2008-03-31 Display device and drive control method thereof
JP2009038663A JP4816744B2 (en) 2008-03-31 2009-02-20 Light emitting device, display device, and drive control method of light emitting device

Publications (2)

Publication Number Publication Date
TW200950576A TW200950576A (en) 2009-12-01
TWI407826B true TWI407826B (en) 2013-09-01

Family

ID=44871372

Family Applications (1)

Application Number Title Priority Date Filing Date
TW98110355A TWI407826B (en) 2008-03-31 2009-03-30 Light-emtting device, display device, and method for controlling driving of the light-emitting device

Country Status (1)

Country Link
TW (1) TWI407826B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030090446A1 (en) * 2001-11-09 2003-05-15 Akira Tagawa Display and driving method thereof
JP2004287345A (en) * 2003-03-25 2004-10-14 Casio Comput Co Ltd Display driving device and display device, and driving control method thereof
TW200518195A (en) * 2003-11-21 2005-06-01 Hitachi Displays Ltd Image display device
JP2008003456A (en) * 2006-06-26 2008-01-10 Seiko Epson Corp Electro-optical device, its control method, and electronic equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030090446A1 (en) * 2001-11-09 2003-05-15 Akira Tagawa Display and driving method thereof
JP2004287345A (en) * 2003-03-25 2004-10-14 Casio Comput Co Ltd Display driving device and display device, and driving control method thereof
TW200518195A (en) * 2003-11-21 2005-06-01 Hitachi Displays Ltd Image display device
JP2008003456A (en) * 2006-06-26 2008-01-10 Seiko Epson Corp Electro-optical device, its control method, and electronic equipment

Also Published As

Publication number Publication date
TW200950576A (en) 2009-12-01

Similar Documents

Publication Publication Date Title
JP4133339B2 (en) Self-luminous display device
TWI420463B (en) Display driving device and display device
US8890778B2 (en) Display device and method for controlling the same
US9236011B2 (en) Organic light emitting diode display device for pixel current sensing in the sensing mode and pixel current sensing method thereof
TWI243352B (en) Pixel circuit, display device, and pixel circuit driving method
KR101142627B1 (en) Display drive apparatus, display apparatus and drive method therefor
US10089934B2 (en) Driving apparatus for organic electro-luminescence display device
TWI246045B (en) Pixel circuit and display device
US8279211B2 (en) Light emitting device and a drive control method for driving a light emitting device
EP2889862B1 (en) Organic light emitting display device and method for driving the same
DE102012112290A1 (en) Organic light-emitting diode display device for sampling a pixel current and a pixel current sampling method therefor
US20070057873A1 (en) Pixel circuit, display unit, and pixel circuit drive method
US8018404B2 (en) Image display device and method of controlling the same
JP2005258407A (en) Light emitting display device, display panel therefor and driving method for light emitting display panel
US8269760B2 (en) Pixel driving device, light emitting device, and property parameter acquisition method in a pixel driving device
KR100937133B1 (en) Display device and display device drive method
CA2463486C (en) Display device and display device driving method
KR20130026338A (en) Pixel circuit of organic light emitting diode display device
TWI385621B (en) Display drive apparatus and a drive method thereof, and display apparatus and the drive method thereof
US20060103322A1 (en) Apparatus and method for driving organic light-emitting diode
TWI413963B (en) Self-luminous display device and driving method of the same
EP1968039A1 (en) Organic light emitting display
US7605792B2 (en) Driving method and circuit for automatic voltage output of active matrix organic light emitting device and data drive circuit using the same
JP2004310014A (en) Light emitting display device, method for driving light emitting display device, and display panel of light emitting display device
CN100520891C (en) Display device, data driving circuit, and display panel driving method