TWI433086B - Pixel driving apparatus, light-emitting apparatus and drive controlling method for light-emitting apparatus - Google Patents

Description

Pixel driving device, illuminating device and driving control method of illuminating device [Reciprocal Reference for Related Applications]

The present invention is based on the Japanese Patent Application No. 2009-163602, filed on Jul. 10, 2009, and the Japanese Patent Application No. 2009-163609, filed on Jul. 10, 2009, and The Japanese Patent Application No. 2010-110932, filed on Jan. 13, the entire entire entire entire entire entire entire entire entire entire content

The present invention relates to a pixel driving device, a driving control method including the light emitting device and the light emitting device including the pixel driving device, and an electronic device including the light emitting device.

In recent years, as a display device that follows the generation of the liquid crystal display device, a light-emitting element type display device (light-emitting device) including a display panel (pixel array) in which light-emitting elements are arranged in an array has been attracting attention. As such a light-emitting element, for example, a current-driven light-emitting element such as an organic electroluminescence element, an inorganic electroluminescence element, or a light-emitting diode (LED) is known.

In particular, in a light-emitting element type display device using an active array type driving method, compared with a well-known liquid crystal display device, display response speed is fast, and there is almost no viewing angle dependency, and high brightness, high contrast, and display picture can be achieved. Excellent display characteristics such as high quality and fineness. Further, since the light-emitting element type display device does not require a backlight or a light guide plate as in the case of a liquid crystal display device, it has an extremely excellent feature that it can be made thinner and lighter. Therefore, it is expected to be applied to various electronic devices in the future.

For example, an organic electroluminescence display device described in Japanese Laid-Open Patent Publication No. Hei 8-330600 is known. The organic electroluminescence display device is an active array drive display device that is driven by a current signal according to a voltage signal, and a circuit (referred to as "pixel circuit" as appropriate) is provided for each pixel, and has a light-emitting structure composed of an organic electroluminescence device. a thin film transistor for current control, wherein a gate is applied with a voltage signal corresponding to the image data to cause a current to flow to the organic electroluminescent element; and a thin film transistor for switching is used to supply a voltage signal corresponding to the image data. Switching to the gate of the thin film transistor for current control.

In such an organic electroluminescence display device according to the luminance gray scale of the light-emitting element of the voltage signal controller, the threshold voltage of the thin film transistor for current control changes with time, which causes a current to flow to the organic electroluminescent element. The current value changes.

Further, in the pixel circuit in which a plurality of pixels arranged in an array shape are used, even if the threshold voltage of the thin film transistor for current control is the same, the gate insulating film or the channel length of the thin film transistor is changed, and the mobility is also deviated. The effect is so deviated in the drive characteristics. Here, it is known that variations in mobility, particularly in low temperature polycrystalline germanium film transistors, occur remarkably. Therefore, although the mobility can be made uniform by using an amorphous germanium film transistor, even in this case, the influence of the variation caused by the process cannot be avoided.

Further, in the pixel circuit of each pixel, even if the film transistor does not have a variation in driving characteristics, variations in the light-emitting characteristics due to process variations occurring during the formation of the organic electroluminescent element occur.

The present invention has an advantage of providing a pixel driving device capable of satisfactorily compensating for variations in characteristics of a pixel circuit and causing a light-emitting element to emit light at a desired luminance gray scale, a light-emitting device including the pixel driving device, and a driving control method of the light-emitting device.

a pixel driving device of the present invention for obtaining the advantage, wherein the pixel is driven to have a light emitting element; and the light emitting driving circuit is a driving control element having a current path connected to the light emitting element; the pixel driving device has characteristics The parameter acquisition circuit obtains an electrical characteristic parameter for compensating for fluctuations in electrical characteristics of the light-emitting drive circuit and an emission characteristic parameter for compensating for variations in characteristics of the light-emitting element. The characteristic parameter acquisition circuit applies a detection voltage to a data line connected to the pixel, and applies a voltage value exceeding a threshold voltage of the drive control element between the control terminal of the drive control element and one end of the current path. The voltage is obtained by obtaining the detection voltage of the data line after at least one relaxation time, and then obtaining the electrical characteristic parameter according to the voltage value of the detection voltage. The characteristic parameter obtaining circuit obtains the light-emitting characteristic parameter based on the light-emitting luminance value of the light-emitting element of the pixel, and the light-emitting element of the pixel performs a light-emitting operation based on the brightness measurement image data corrected according to the electrical characteristic parameter.

The light-emitting device of the present invention for obtaining the above-described advantages includes a light-emitting panel having a plurality of data lines arranged along the first direction and at least one of which is disposed along a second direction intersecting the first direction. a scan line, and a plurality of data lines connected to the data lines of the plurality of data lines and the scan lines, and a plurality of pixels disposed near the intersection of the data lines and the scan lines; and a driving circuit for driving the light-emitting panel. Each of the pixels has a light-emitting element, and the light-emitting drive circuit is a drive control element having one end of the current path connected to the light-emitting element. The driving circuit includes a scan driving circuit that applies a selection signal to the scanning line, and sets each pixel connected to the scanning line to a selected state, and a characteristic parameter obtaining circuit that is configured to be set by the scanning line driving circuit An electrical characteristic parameter of each of the pixels in the selected state for compensating for variations in electrical characteristics of the light-emitting drive circuit, and an emission characteristic parameter for compensating for variations in characteristics of the light-emitting element. The characteristic parameter acquisition circuit applies a detection voltage to each of the data lines connected to the pixel, and applies a drive exceeding the drive control element between the control terminal of the drive control element and the end of the current path of each pixel. The voltage of the voltage value of the limit voltage obtains the detection voltage of each data line after at least one relaxation time, and then obtains the electrical characteristic parameter according to the voltage value of the detection voltage, and emits light according to the light-emitting element of each pixel. The luminance value obtains the illumination characteristic parameter, and the light-emitting element of each pixel performs a light-emitting operation based on the luminance measurement image data corrected based on the electrical characteristic parameter.

A driving control method for a light-emitting device of the present invention for obtaining the advantage, the light-emitting device having a light-emitting panel, wherein the light-emitting panel includes a plurality of data lines and a plurality of pixels connected to the data lines, the pixels having light-emitting elements And a light-emitting drive circuit, which is a drive control element having one end of the current path connected to the light-emitting element; the drive control method of the light-emitting device has a voltage application step of applying a voltage for detection to each data line, and a control voltage of the drive control element of the pixel and one end of the current path is applied to a detection voltage exceeding a threshold voltage of the drive control element; and the voltage acquisition step applies the detection voltage after at least one easing time Obtaining the voltages of the data lines as a plurality of detection voltages; and obtaining an electrical characteristic parameter, obtaining electrical characteristics of the light-emitting driving circuit for compensating the pixels according to the obtained voltage values of the plurality of detection voltages The changed electrical characteristic parameter; the illuminating action step is to correct the light according to the electrical characteristic parameter Measured image data, and the light-emitting element of each pixel is illuminated in response to the corrected brightness measurement image data; and the light-emitting characteristic parameter obtaining step is to obtain the light-emitting element of each pixel for performing the light-emitting operation The measured value of the light-emitting luminance is obtained from the obtained value of the light-emitting luminance, and the light-emitting characteristic parameter for compensating for the characteristic variation of the light-emitting element is obtained.

The advantages of the invention will be set forth in the description which follows. The advantages of the present invention can be realized and obtained by the means and combinations particularly pointed out below.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in FIG

Hereinafter, a pixel driving device, a light-emitting device, a driving control method of the light-emitting device, and an electronic device according to an embodiment of the present invention will be described in detail with reference to the drawings. Further, in the present embodiment, a light-emitting device which is used as a display device will be described.

<First embodiment>

First, a schematic configuration of a light-emitting device including a pixel driving device according to a first embodiment of the present invention will be described.

(display device)

Fig. 1 is a schematic configuration diagram showing a configuration example of a display device to which the present invention is applied.

As shown in FIG. 1, the display device (light-emitting device) 100 of the present embodiment substantially includes a display panel (light-emitting panel) 110, a selection driver (scanning drive circuit) 120, a power source driver 130, a data driver 140, and a controller 150 (150a). , 150b).

Here, the selection driver 120, the power driver 130, the data driver 140, and the controller 150 correspond to the pixel driving device or the driving circuit in the present invention.

As shown in FIG. 1, the display panel 110 has a plurality of pixels PIX which are two-dimensionally arranged in the column direction (the horizontal direction of the drawing) and the row direction (the lower direction of the drawing) (for example, p columns × q rows, p, q) a positive integer); a plurality of selection lines (scanning lines) Ls and a plurality of power lines La are arranged to be connected to pixels PIX arranged in the column direction; the common electrode Ec is commonly disposed on the full pixel PIX; The strip data line Ld is arranged to be connected to the pixels PIX arranged in the row direction. Here, each pixel PIX has a light-emitting drive circuit and a light-emitting element as will be described later.

The selection driver 120 is connected to each of the selection lines Ls provided on the display panel 110 described above. The selection driver 120 sequentially applies a predetermined voltage level to the selection line Ls of each column at a predetermined timing based on a selection control signal (for example, a scan clock signal and a scan start signal) supplied from a controller 150 to be described later (selection level: Vgh or Non-selected level: Vgl) selection signal Ssel.

Further, the selection driver 120 is configured to include, for example, a shift register, and sequentially outputs a shift signal corresponding to the selection line Ls of each column based on the selection control signal supplied from the controller 150; and an output buffer The shift signal is converted into a predetermined signal level (selection level, for example, a high level), and sequentially output to the selection line Ls of each column as the selection signal Ssel.

The power driver 130 is connected to each power line La disposed on the display panel 110. The power driver 130 applies a predetermined voltage level to the power line La of each column at a predetermined timing based on a power supply control signal (for example, an output control signal) supplied from a controller 150 (to be described later) (light emission level: ELVDD or non-light emission level: DVSS) ) The power supply voltage Vsa.

The data driver 140 is connected to each data line Ld of the display panel 110, and generates a gray scale signal (gray scale voltage corresponding to the image data) at least in the display operation (lighting action) according to a data control signal supplied from a controller 150 to be described later. Vdata) is supplied to the pixel PIX via each data line Ld.

In addition, the data driver 140 applies a detection voltage (first voltage) Vdac of a specific voltage value to the pixel PIX to be subjected to the characteristic parameter acquisition operation via the respective data lines Ld, and the predetermined natural easing is performed. The voltage Vd of each data line Ld after the time t is taken in as the data line detection voltage Vmeas(t), and converted into the detection data n _meas (t) and output.

Here, the data driver 140 is provided with both a data driving function and a voltage detecting function, and is configured to switch these functions in accordance with a data control signal supplied from a controller 150 to be described later.

The data driving function performs an operation of converting image data composed of digital data supplied via the controller 150 into an analog signal voltage, and outputting it to each data line Ld as a gray scale signal (gray scale voltage Vdata).

The voltage detecting function performs an operation of taking the analog signal voltage Vd taken in each data line Ld as the data line detecting voltage Vmeas(t), converting it into digital data, and outputting it to the controller 150 as the detecting data n _meas (t).

Fig. 2 is a schematic block diagram showing a configuration example of a data driver applied to the display device of the embodiment.

Fig. 3 is a schematic circuit configuration diagram showing an example of a configuration of a main part of a data driver shown in Fig. 2.

Here, only a part of the number of rows (q) of the pixels PIX arranged in the display panel 110 is shown to simplify the illustration.

In the following description, the configuration of the inside of the data driver 140 provided in the data line Ld of the jth line (j is a positive integer of 1≦j≦q) will be described in detail.

Further, in Fig. 3, the shift register circuit and the data register circuit are simplified.

As shown in FIG. 2, the data driver 140 basically includes a shift register circuit 141, a data register circuit 142, a data latch circuit 143, a DAC/ADC circuit 144, and an output circuit 145. The data driver 140 is divided into an internal circuit 140A and an internal circuit 140B.

The internal circuit 140A includes a shift register circuit 141, a data register circuit 142, and a data latch circuit 143, and performs image capture operation and detection described later based on the power supply voltages LVSS and LVDD supplied from the logic power supply 146. The sending action of the data.

The internal circuit 140B includes a DAC/ADC circuit 144 and an output circuit 145, and performs a grayscale signal generation and output operation and a data line voltage detection operation, which will be described later, based on the power supply voltages DVSS and VEE supplied from the analog power supply 147.

The shift register circuit 141 generates a shift signal based on the data control signal (clock signal CLK and the originating arterial signal SP) supplied from the controller 150, and sequentially outputs the shift signal to the data register circuit 142. The data register circuit 142 includes a register arranged in the number of rows (q) of the pixels PIX of the display panel 110 described above. The data register circuit 142 sequentially takes in one line of video data Din(1) to Din(q) based on the input timing of the shift signal supplied from the shift register circuit 141. Here, the image data Din(1)~Din(q) is a serial data composed of digital signals.

The data latch circuit 143 is taken into the data register circuit 142 according to the data control signal (data latch pulse signal LP) during the display operation (the image data capture operation and the gray scale signal generation output operation). The image data Din(1) to Din(q) of one column are held in correspondence with each row, and the image data Din(1) to Din(q) are transmitted to the DAC/ADC circuit 144 to be described later at a predetermined timing.

Further, when the characteristic parameter obtaining operation (detection data transmission operation and data line voltage detection operation), the data latch circuit 143 holds and maintains each data line voltage Vmeas (t) which is taken in via the DAC/ADC circuit 144 which will be described later. After the corresponding detection data n _meas (t), the detection data n _meas (t) is output as a serial data at a predetermined timing.

Specifically, as shown in FIG. 3, the data latch circuit 143 includes a data latch 41 (j) provided for each row, switches SW4 (j), SW5 (j) for connection switching, and data output. Switch SW3 used. The data latch 41(j) holds (latch) the digital data supplied via the switch SW5(j) at the rising timing of the data latch pulse signal LP, for example.

The switch SW5(j) performs switching control based on the data control signal (switching control signal S5) supplied from the controller 150 to connect the data register circuit 142 on the contact Na side or the DAC/ADC circuit on the contact Nb side. Any one of the data latches 41(j) of the ADC 43(j) of 144 or the adjacent row (j+1) of the contact Nc side is selectively coupled to the data latch 41(j).

Therefore, when the switch SW5(j) is set to be connected to the contact Na side, the image data Din(j) supplied from the material latch circuit 143 is held by the data latch 41(j).

Further, when the switch SW5(j) is set to be connected to the contact Nb side, the data latch Ld is taken from the data line Ld to the ADC 43(j) of the DAC/ADC circuit 144. The data line detection voltage Vmeas (t)) detected data n _meas (t) is latched data 41 (j) remains.

Further, in the case where the switch SW5(j) is set to be connected to the contact Nc side, the switch SW4(j+1) of the adjacent row (j+1) is held by the data latch 41(j+1). The detection data n _meas (t) is held by the data latch 41 (j).

Further, the switch SW5(q) provided in the last row (q) connects the power supply voltage LVSS of the logic power supply 146 and the contact Nc.

The switch SW4(j) performs switching control based on the data control signal (switching control signal S4) supplied from the controller 150 to connect the DAC 42(j) of the DAC/ADC circuit 144 on the contact Na side or the contact Nb side. Any one of the switch SW3, or the switch SW5(j-1) of the adjacent row (j-1), is selectively coupled to the data latch 41(j).

Therefore, when the switch SW4(j) is set to be connected to the contact Na side, the image data Din(j) held by the data latch 41(j) is supplied to the DAC 42(j) of the DAC/ADC circuit 144. Further, when the switch SW4(j) is connected to the contact point Nb side, the detection data of the data line detection voltage Vmeas(t) held by the data latch 41(j+1) is externally output via the switch SW3. n _meas (t).

According to the data control signal (switching control signals S4, S5) supplied from the controller 150, the switching control of the switches SW4(j), SW5(j) of the data latch circuit 143 is performed, and the data latches in the adjacent rows are performed. When 41(1) to 41(q) are connected in series, the switch SW3 is controlled to be in an on state based on the data control signal (switching control signal S3, data latch pulse signal LP). Thereby, the detection data n _meas (t) of the data line detection voltage Vmeas(t) held by the data latches 41(1) to 41(q) held in each row is sequentially taken out as the serial data via the switch SW3. And output to the outside.

4A and 4B are diagrams showing output and output characteristics of a digital-analog conversion circuit (DAC) and an analog-to-digital conversion circuit (ADC) applied to the data driver of the present embodiment. Fig. 4A is a diagram showing an output input characteristic applied to the DAC of the embodiment, and Fig. 4B is a diagram showing an output input characteristic applied to the ADC of the embodiment. Here, the output-input characteristic diagram of the digital-analog conversion circuit and the analog-digital conversion circuit when the number of output input bits of the digital signal is set to 10 bits is shown.

As shown in FIG. 3, the DAC/ADC circuit 144 includes a linear voltage digital-analog conversion circuit (DAC: voltage application circuit) 42(j) and an analog-digital conversion circuit (ADC: detection data acquisition circuit) corresponding to each row. ) 43(j).

The DAC 42(j) converts the image data Din(j) composed of the digital data held by the data latch circuit 143 into the analog signal voltage Vpix(j), and outputs it to the output circuit 145.

Here, the DAC 42(j) provided in each row has a linearity in the conversion characteristic (output input characteristic) of the analog signal voltage outputted from the input digital data as shown in FIG. 4A. That is, for example, the DAC 42(j) converts the 10-bit (ie, 1024 gray scale) digital data (0, 1, ..., 1023) into a linearly set analog signal voltage (V ₀ as shown in FIG. 4A). , V ₁ , ..., V ₁₀₂₃ ).

Such ratio of the signal voltage (V ₀ ~ V ₁₀₂₃₎ based on analog power from the later of the supply 147 of the power supply voltage DVSS ~ is set within a range VEE of, for example, is set at a value of digital data of the input of "0" (0 The analog signal voltage V ₀ converted at the time of the gray scale becomes the power supply voltage DVSS on the high potential side. Further, it is set such that the analog signal voltage V ₁₀₂₃ converted when the value of the digital data is "1023" (1023 gray scale: maximum gray scale) becomes higher than the power supply voltage VEE on the low potential side, and becomes the power supply voltage VEE. The voltage value nearby.

Further, the ADC 43(j) converts the data line voltage Vmeas(t) composed of the analog signal voltage taken from the data line Ld(j) into the detection data n _meas (t) composed of the digital data, and supplies the data to the data The latch 41 (j) is sent out.

Here, the ADC 43(j) provided in each row has a linear conversion characteristic (output input characteristic) of the digital data of the output of the conversion characteristic of the analog signal input as shown in FIG. 4B.

Further, the bit width of the digital data at the time of voltage conversion of the ADC 43 (j) is set to be the same as that of the DAC 42 (j) described above. That is, the voltage value of the ADC 43(j) corresponding to the minimum unit bit (1LSB: analog resolution) is set to be the same as the value of the DAC 42(j).

For example, as shown in FIG. 4B, the ADC 43(j) converts the analog signal voltage (V ₀ , V ₁ , ..., V ₁₀₂₃ ) set within the range of the power supply voltage DVSS to VEE into a linearly set 10-bit ( Digital data of 1024 gray scale) (0, 1, ..., 1023).

ADC43 (j) based, for example when the voltage of the analog input signal voltage V ₀ is the value of the digital data is converted into "0" (0 gray scales) is set. The ADC 43(j) is converted into a digital signal value "1023" when the voltage value of the analog signal voltage is higher than the power supply voltage VEE and the analog signal voltage V ₁₀₂₃ near the power supply voltage VEE (1023 gray scale) : Maximum grayscale mode setting.

In the present embodiment, the internal circuit 140A including the shift register circuit 141, the data register circuit 142, and the data latch circuit 143 is configured as a low withstand voltage circuit, and will include a DAC/ADC circuit 144 and an output circuit 145. The internal circuit 140B is configured as a high withstand voltage circuit.

Thus, the level shifter LS1(j) is disposed between the data latch circuit 143 (the switch SW4(j)) and the DAC 42(j) of the DAC/ADC circuit 144 as the internal circuit 140A from the low withstand voltage A voltage regulating circuit of the high withstand voltage internal circuit 140B.

Further, the level shifter LS2(j) is provided between the ADC 43(j) of the DAC/ADC circuit 144 and the data latch circuit 143 (switch SW5(j)) as the internal circuit 140B from the high withstand voltage. A voltage regulating circuit of the low withstand internal circuit 140A.

As shown in FIG. 3, the output circuit 145 includes a buffer 44(j) and a switch SW1(j) (connection switching circuit) for outputting gray scale signals to the data lines Ld(j) corresponding to the respective rows, and The switch SW2(j) of the data line voltage Vd (the data line detection voltage Vmeas(t)) and the buffer 45(j) are taken in.

The buffer 44(j) is used to compare the analog signal voltage Vpix(j) generated by the analog conversion of the image data Din(j) by the DAC 42(j) as the gray scale voltage Vdata(j) via the switch SW1(j). A buffer circuit applied to the data line Ld(j).

The switch SW1(j) controls the application of the gray scale voltage Vdata(j) to the data line Ld(j) in accordance with the data control signal (switching control signal S1) supplied from the controller 150.

Further, the switch SW2(j) controls the taking in of the data line voltage Vd (the data line detection voltage Vmeas(t)) based on the data control signal (switching control signal S2) supplied from the controller 150.

The buffer 45(j) is a buffer circuit for applying the data line voltage Vmeas(t) taken in via the switch SW2(j) to the ADC 43(j).

The logic power supply 146 supplies a power supply voltage LVSS on the low potential side and a power supply voltage LVDD on the high potential side, which are used to drive the shift register circuit 141 and the data register circuit 142 including the data driver 140. And the internal circuit 140A of the data latch circuit 143.

The analog power supply 147 supplies a high-potential side power supply voltage DVSS composed of an analog voltage and a low-potential side power supply voltage VEE for driving the DAC 42(j) and the ADC 43(j) including the DAC/ADC circuit 144, and an output circuit. The internal circuit 140B of the buffer 44 (j), 45 (j) of 145.

Further, in the data driver 140 shown in FIGS. 2 and 3, for convenience of illustration, a control signal for controlling the operation of each unit is input to the jth line (corresponding to the first line in the figure). The data latch L41 and the switches SW1 to SW5 are provided corresponding to the data line Ld(j). In the present embodiment, of course, these control signals are commonly input to the configuration corresponding to each row.

Fig. 5 is a functional block diagram showing the function of a controller applied to the display device of the embodiment.

In addition, in FIG. 5, for convenience of illustration, the flow of data between the functional blocks is indicated by solid arrows. In fact, as will be described later, the flow of any of these materials becomes effective in response to the operating state of the controller.

The controller 150a of the present embodiment controls at least the operation states of the selection driver 120, the power source driver 130, and the data driver 140, and generates a selection control signal, a power control signal, and a data control signal for performing a predetermined drive control operation of the display panel 110. And output.

The controller 150a supplies the selection control signal, the power supply control signal, and the data control signal to operate the selection driver 120, the power driver 130, and the data driver 140 at predetermined timings to control the characteristics of each pixel PIX of the display panel 110. The operation of the parameter (the characteristic parameter acquisition operation) and the image information of the image data corrected in accordance with the characteristic parameter of each pixel PIX are displayed on the display panel 110 (display operation).

Further, in the characteristic parameter obtaining operation, the controller 150a selects the detection data related to the change in the characteristics of each pixel PIX detected by the data driver 140, and the luminance data detected for each pixel PIX (details will be After the description), obtain various corrections.

Further, during the display operation, the controller 150a corrects the image data supplied from the outside based on the correction data acquired in the characteristic parameter obtaining operation, and supplies it to the data driver 140 as the corrected image data.

Specifically, as shown in FIG. 5, the controller (image data correction circuit) 150a includes a voltage amplitude setting function circuit 152a including a reference table (LUT) 151, a multiplication function circuit (image data correction circuit) 153a, and An addition function circuit (image data correction circuit) 154a, a memory (memory circuit) 155, and a correction material acquisition function circuit (characteristic parameter acquisition circuit) 156.

The voltage amplitude setting function circuit 152a converts the voltages corresponding to the respective colors of red (R), green (G), and blue (B) by referring to the reference table 151 for the image data composed of the digital data supplied from the outside. amplitude. Here, the maximum value of the voltage amplitude of the converted image data is set to be smaller than the value of the correction amount of the characteristic parameter of each pixel from the maximum value of the input range of the DAC 42 described above.

The multiplication function circuit 153a corrects the current amplification factor β obtained based on the detection data related to the characteristic change of each pixel PIX, or the luminance data (light emission current efficiency η) detected for each pixel PIX and the current amplification factor. The corrected data of β is multiplied by the image data.

The addition function circuit 154a adds the correction data and the image data of the threshold voltage Vth of the drive transistor obtained based on the detection data related to the characteristic change of each pixel PIX, and supplies it to the data driver 140 as the corrected image data.

The correction data acquisition function circuit 156 obtains correction data of the current amplification factor β, the emission current efficiency η, and the threshold voltage Vth based on the detection data related to the characteristic change of each pixel PIX and the luminance data detected for each pixel PIX. Here, as for the luminance data of each pixel PIX, for example, the display panel 110 performs the light-emitting luminance of each pixel PIX when the light-emitting operation is performed based on the image data of the predetermined luminance gray scale, and uses a luminance meter or a CCD camera (brightness measurement circuit). 160 measurements. Further, a specific measurement method regarding the luminance data will be described later.

The memory 155 stores the detection data of each pixel PIX sent from the above-described material driver 140 in correspondence with each pixel PIX.

Further, the correction data acquired by the memory 155 correction data acquisition function circuit 156 is stored in correspondence with each pixel PIX.

When the addition processing of the addition function circuit 154a and the correction data acquisition processing of the correction data acquisition function circuit 156 are performed, the addition function circuit 154a and the correction data acquisition function circuit 156 read the detection data from the memory 155.

Further, in the controller 150a shown in FIG. 5, the correction data acquisition function circuit 156 may be an arithmetic unit provided outside the controller 150a.

Further, in the controller 150a shown in FIG. 5, the memory 155 may be an individual memory as long as it is associated with each pixel PIX and memorizes the detected data and the corrected data.

Further, these memories 155 may be memory devices provided outside the controller 150a.

Further, the image data supplied to the controller 150a extracts, for example, a luminance grayscale signal component from the video signal, and forms the luminance grayscale signal component as a serial data composed of digital signals for each column of the display panel 110.

(pixel)

Next, the configuration of the pixels arranged in the display panel of the present embodiment will be specifically described.

Fig. 6 is a circuit configuration diagram showing an embodiment of a pixel applied to the display panel of the embodiment.

Each pixel PIX applied to the display panel of the present embodiment is disposed in the vicinity of each intersection of the selection line Ls connected to the selection driver 120 and the data line Ld connected to the data driver 140, as shown in FIG. Each of the pixels PIX includes an organic electroluminescence element OEL that is a current-driven light-emitting element, and a light-emission drive circuit DC that generates a current for driving the organic electroluminescence element OEL to emit light.

The light-emitting drive circuit DC shown in Fig. 6 has a circuit configuration including substantially transistors Tr11 to Tr13 and a capacitor (storage capacitor) Cs.

The gate terminal of the transistor (second transistor) Tr11 is connected to the selection line Ls, and the gate terminal is connected to the power supply line La, and the source terminal is connected to the connection point N11.

The gate terminal of the transistor (third transistor) Tr12 is connected to the selection line Ls, and the source terminal is connected to the data line Ld, and the gate terminal is connected to the connection point N12.

The gate terminal of the transistor (drive control element, first transistor) Tr13 is connected to the connection point N11, the 汲 terminal is connected to the power supply line La, and the source terminal is connected to the connection point N12.

Further, a capacitor (capacitance element) Cs is connected between the gate terminal (connection point N11) of the transistor Tr 13 and the source terminal (connection point N12). The capacitor Cs may be a parasitic capacitance formed between the gate and the source terminal of the transistor Tr13, or may be a parallel connection between the connection point N11 and the connection point N12 in addition to the parasitic capacitance. .

Further, the anode (anode electrode) of the organic electroluminescent element OEL is connected to the connection point N12 of the light-emitting drive circuit DC, and the cathode (cathode electrode) is connected to the common electrode Ec. The common electrode Ec is connected to an external constant voltage source to apply a predetermined voltage ELVSS (for example, a ground potential GND).

Further, in the pixel PIX shown in Fig. 6, in addition to the capacitor Cs, the pixel capacitance Cel is present in the organic electroluminescent element OEL. Further, the wiring parasitic capacitance Cp is present in the data line Ld.

Here, in the pixel PIX of the present embodiment, the power source voltage Vsa (ELVDD, DVSS) applied to the power source line La from the power source driver 130, the voltage ELVSS applied to the common electrode Ec, and the analog power source 147 are supplied to the data driver 140. The relationship of the power source voltage VEE is set to, for example, the following conditions.

DVSS<ELDD

DVSS=ELVSS(=GND) ...(1)

VEE<ELVSS

Further, in the pixel PIX shown in Fig. 6, for example, a thin film transistor (TFT) having the same channel type can be applied to the transistors Tr11 to Tr13. The transistors Tr11 to Tr13 may also be amorphous germanium thin film transistors or polycrystalline germanium thin film transistors.

In particular, as shown in Fig. 6, in the case where an n-channel thin film transistor is used as the transistor Tr11 to Tr13, and an amorphous germanium film transistor is used as the transistor Tr11 to Tr13, the established amorphous germanium manufacturing technique is applied. Compared with a polycrystalline or single crystal ruthenium film transistor, it is possible to realize a transistor having uniform and stable operation characteristics (electron mobility, etc.) in a simple process.

Further, in the above-described pixel PIX, a circuit configuration in which three transistors Tr11 to Tr13 are provided as the light-emitting drive circuit DC and the organic electroluminescence element OEL is used as the light-emitting element is shown. The present invention is not limited to the embodiment, and may have another circuit configuration including three or more transistors. Further, the light-emitting element that is driven by the light-emitting drive circuit DC may be a current-driven light-emitting element, and may be another light-emitting element such as a light-emitting diode.

(Drive control method of display device)

Next, a drive control method of the display device of the present embodiment will be described.

The drive control operation of the display device 100 of the present embodiment is basically constituted by a characteristic parameter acquisition operation and a display operation.

In the characteristic parameter obtaining operation, parameters for compensating for variations in the light-emitting characteristics of the pixels PIX arranged on the display panel 110 are obtained.

More specifically, the characteristic parameter obtaining operation performs a parameter for correcting the fluctuation of the threshold voltage Vth of the transistor (driving transistor) Tr13 provided in the light-emitting drive circuit DC of each pixel PIX, for correcting each pixel PIX. The parameter of the deviation of the current amplification factor β from the set value and the parameter for correcting the deviation of the luminous current efficiency η of the organic electroluminescent element OEL in each pixel PIX from the set value.

In the display operation, the corrected image data obtained by correcting the image data composed of the digital data is generated based on the correction parameter obtained by the pixel PIX by the characteristic parameter obtaining operation described above, and the gray scale voltage corresponding to the corrected image data is generated. Vdata is written to each pixel PIX. Therefore, each pixel PIX (organic electroluminescence element OEL) compensates for the electrical characteristics of each pixel PIX (the threshold voltage Vth of the transistor Tr13, the current amplification factor β) and the light-emitting characteristics (organic electroluminescence element OEL) The variation or deviation of the luminous current efficiency η) illuminates due to the original luminance gray scale of the image data.

Hereinafter, each operation will be specifically described.

(characteristic parameter acquisition action)

Here, a technique unique to the characteristic parameter obtaining operation of the present embodiment will be described first. Next, an operation for obtaining a characteristic parameter for compensating the threshold voltage Vth and the current amplification factor β at each pixel PIX using this method will be described. Next, an operation for obtaining a characteristic parameter for compensating for the luminous current efficiency η will be described.

First, the light-emitting drive circuit DC when the pixel PIX having the light-emitting drive circuit DC shown in FIG. 6 is written from the data driver 140 via the data line Ld (the gray-scale voltage Vdata corresponding to the image data is applied) is described. Voltage-current (VI) characteristics.

Fig. 7 is a view showing an operation state when a pixel of the light-emitting drive circuit of the embodiment is applied to write image data.

Fig. 8 is a view showing a voltage-current characteristic of a pixel to which the light-emitting drive circuit of the embodiment is applied during a write operation.

In the writing operation of the image data of the pixel PIX in the present embodiment, as shown in FIG. 7, the selection signal Ssel of the selection level (high level: Vgh) is applied from the selection driver 120 via the selection line Ls. The pixel PIX is set to the selected state.

At this time, the transistors Tr11 and Tr12 of the light-emitting drive circuit DC are turned on, and the gate and the gate terminal of the transistor Tr13 are short-circuited, and the diode is connected.

Further, in this selected state, the power source voltage Vsa (= DVSS) of the light emission level is applied from the power source driver 130 via the power source line La.

Then, the data line Ld is applied with a gray scale voltage Vdata corresponding to the voltage value of the image data from the data driver 140. Here, the gray scale voltage Vdata is set to be lower than the power source voltage DVSS applied from the power source driver 130. Therefore, when the power supply voltage DVSS is set to 0 V (ground potential GND), the gray scale voltage Vdata is set to a negative voltage value.

Therefore, as shown in FIG. 7, the gate current Id corresponding to the gray scale voltage Vdata is from the power source driver 130 via the power source line La, the transistors Tr13 and Tr12 of the pixel PIX (light-emitting drive circuit DC), along the data line Ld direction. flow. Here, the voltage ELVSS applied to the cathode (cathode electrode) of the organic electroluminescent element OEL and the power supply voltage DVSS are set to the same voltage value as shown by the condition of the above formula (1), because both are Since it is set to 0 V (ground potential GND), a reverse bias is applied to the organic electroluminescent element OEL, and the light-emitting operation is not performed.

The circuit characteristics of the light-emitting drive circuit DC for this case are verified. In the light-emitting drive circuit DC, the threshold voltage Vth of the transistor Tr13 of the drive transistor is not changed, and the current amplification factor β of the light-emitting drive circuit DC is not deviated from the set value, and the transistor is turned on. When the threshold voltage of Tr13 is Vth ₀ and the current amplification factor is β, the current value of the drain current Id shown in FIG. 7 can be expressed by the following equation (2).

Id=β(V ₀ -Vdata-Vth ₀ ) ² ...(2)

Here, the light emission drive design or standard values of the DC circuit (Typical) a current amplification factor beta], and the transistor Tr13 starting threshold voltage Vth ₀ are constants. Further, V ₀ is a power supply voltage Vsa (= DVSS) of a non-light-emitting level applied from the power source driver 130, and the voltage (V _{0 -} Vdata) corresponds to a circuit in which the current paths applied to the driving transistors Tr13 and Tr12 are connected in series. The potential difference formed. At this time, the relationship between the value of the voltage (V _{0 -} Vdata) applied to the light-emitting drive circuit DC and the current value of the drain current Id flowing to the light-emitting drive circuit DC (VI characteristic) is represented by the characteristic line SP1 in FIG. .

Then, the threshold voltage after the change in the element characteristics of the transistor Tr13 (the threshold voltage shift; the fluctuation amount is ΔVth) due to the change with time is Vth (= Vth ₀ + ΔVth) At this time, the circuit characteristics of the light-emitting drive circuit DC are changed as shown in the following formula (3). Here, Vth is a constant. The voltage-current (VI) characteristic of the light-emitting drive circuit DC at this time is shown as a characteristic line SP2 in FIG.

Id=β(V ₀ -Vdata-Vth) ² ...(3)

Further, in the initial state shown in the above formula (2), when the current amplification factor when the current amplification factor β is deviated from the set value is β', the circuit characteristics of the light-emitting drive circuit DC can be as follows ( 4) Expression.

Id=β'(V ₀ -Vdata-Vth ₀ ) ² ...(4)

Here, β' is a constant. The circuit characteristics of the light-emitting drive circuit DC at this time are indicated by the characteristic line SP3 in Fig. 8. Further, the characteristic line SP3 shown in Fig. 8 indicates the voltage of the light-emitting drive circuit DC when the current amplification factor β' in the equation (4) is smaller than the current amplification factor β shown in the equation (2). - Current (VI) characteristics.

In the equations (2) and (4), when the current amplification factor of the design value or the standard value (Typical) is βtyp, the parameter for correcting the current amplification factor β' to the value is used ( Correction data) set to Δβ. At this time, the correction data Δβ is supplied to each of the light-emission drive circuits DC so that the product of the current amplification factor β' and the correction data Δβ becomes the current amplification factor βtyp of the design value (that is, β' × Δβ → βtyp).

In the present embodiment, the voltage-current characteristics (the (2) to the (4) and the eighth) of the above-described light-emitting drive circuit DC are obtained by using a unique method as follows. The characteristic parameter of the threshold voltage Vth and the current amplification factor β' of the crystal Tr13. In addition, in this patent specification, the method shown below is referred to as "automatic zeroing method".

In the pixel PIX having the light-emitting drive circuit DC shown in Fig. 6, first, the data driver function of the above-described data driver 140 is used in the selected state in the method (auto-zero method) to which the characteristic parameter obtaining operation of the present embodiment is applied. The predetermined detection voltage Vdac is applied to the data line Ld.

Then, the data line Ld is set to a high impedance (HZ) state, and the potential of the data line Ld is naturally moderated.

Next, the voltage detection function of the data driver 140 is used to take in the voltage Vd (data line detection voltage Vmeas(t)) of the data line Ld which is naturally relaxed for a fixed time (duration time t).

Then, the taken data line detection voltage Vmeas(t) is converted into detection data n _meas (t) composed of digital data.

Here, in the present embodiment, the relaxation time t is set to a plurality of different times (timing: t ₀ , t ₁ , t ₃ , t ₃ ), and the plurality of data line detection voltages Vmeas(t) are executed. Take in and become a conversion of the test data n _meas (t).

Fig. 9 is a graph showing a change in the data line voltage (transition curve) of the technique (automatic zeroing method) applied to the characteristic parameter obtaining operation of the present embodiment.

Specifically, the characteristic parameter obtaining operation of the automatic zeroing method is used. First, in the state where the pixel PIX is set to the selected state, the data voltage is applied from the data driver 140 to the data line Ld to apply the detection voltage Vdac to the light of the light-emitting driving circuit DC. A voltage exceeding the threshold voltage of the transistor Tr13 is applied between the gate and the 汲 terminal of the crystal Tr 13 (between the connection points N11 and N12).

At this time, in the write operation to the pixel PIX, since the power supply voltage DVSS (=Vc: ground potential GND) of the non-light-emitting level is applied from the power source driver 130 to the power source line La, the potential difference (V _{0 -} Vdac) is applied to Between the gate and source terminals of the transistor Tr13. Therefore, the detection voltage Vdac is set to a voltage satisfying the condition V ₀ -Vdac>Vth. Further, the detection voltage Vdac is a voltage value lower than the power supply voltage DVSS, and is set to have a negative electrode with respect to the power supply voltage ELVSS (ground potential GND) applied to the common electrode Ec connected to the cathode of the organic electroluminescent element OEL. Sexual voltage value.

Therefore, the drain current Id in response to the detection voltage Vdac flows from the power source driver 130 via the power source line La, the transistors Tr13, and Tr12 in the direction of the data line Ld. At this time, the capacitor Cs connected between the gate and the source of the transistor Tr13 (between the contacts N11 and N12) is charged with a voltage corresponding to the detection voltage Vdac.

Next, the data input side of the data line Ld is set to a high impedance (HZ) state. Here, shortly after the data line Ld is set to the high impedance state, the voltage charged to the capacitor Cs is maintained at the voltage corresponding to the detection voltage Vdac. Therefore, the gate and source-to-source voltage Vgs of the transistor Tr13 is maintained at the voltage charged to the capacitor Cs.

Therefore, after the data line Ld is set to the high impedance state, the transistor Tr13 is kept in the on state, and the drain current Id flows between the drain and the source of the transistor Tr13. Here, the potential of the source terminal (connection point N12) of the transistor Tr13 gradually rises to a potential close to the 汲 terminal side as time passes, and flows to the drain current Id between the drain and the source of the transistor Tr13. The current value is gradually reduced.

Along with this, a part of the electric charge stored in the capacitor Cs is gradually discharged, so that the voltage between the both ends of the capacitor Cs (the gate of the transistor Tr13 and the voltage Vgs between the sources) gradually decrease. Therefore, as shown in FIG. 9, the voltage Vd of the data line Ld gradually rises from the detection voltage Vdac with time, and gradually rises to converge to the voltage from the 汲 terminal of the transistor Tr13 (the power supply voltage of the power line La) DVSS (= V ₀ )) The voltage (V _{0 -} Vth) of the threshold voltage Vth of the transistor Tr13 is subtracted.

Then, in this natural relaxation, finally, when the drain current Id does not flow between the drain and the source of the transistor Tr13, the discharge of the charge stored in the capacitor Cs is stopped. At this time, the gate voltage (gate voltage and source-to-source voltage Vgs) of the transistor Tr13 becomes the threshold voltage Vth of the transistor Tr13.

Here, in the state in which the drain current Id does not flow between the drain and the source of the transistor Tr13 of the light-emitting drive circuit DC, since the voltage between the drain and the source of the transistor Tr12 becomes almost 0 V, the natural relaxation is achieved. At the end, the data line voltage Vd is almost equal to the threshold voltage Vth of the transistor Tr13.

Further, in the transition curve shown in Fig. 9, the data line voltage Vd gradually converges to the threshold voltage Vth (= ∣V _{0 -} Vth ∣) of the transistor Tr13 as time passes. However, although the data line voltage Vd is infinitely approaching the threshold voltage Vth, theoretically, even if the sufficiently long relaxation time t is set, it cannot be completely equal to the threshold voltage Vth.

Such a transition curve (characteristic of the data line voltage Vd caused by natural relaxation) can be expressed by the following formula (11).

In the above formula (11), C is the sum of the capacitance components added to the data line Ld in the circuit configuration of the pixel PIX shown in Fig. 6, with C = Cel + Cs + Cp (Cel: pixel capacitance, Cs : Capacitor capacitance, Cp: wiring parasitic capacitance). Further, the detection voltage Vdac is defined as a voltage value satisfying the condition of the following formula (12).

In the above formula (12), Vth_max represents a compensation limit value of the threshold voltage Vth of the transistor Tr13. Here, nd is defined as the digital data (the digital data for specifying the detection voltage Vdac) at the beginning of the input DAC 42 in the DAC/ADC circuit 144 of the data driver 140, where the digital data n _d is 10 bits. In the case, d is an arbitrary value that satisfies the condition of the formula (12) in 1 to 1023. Further, ΔV is defined as the bit width of the digital data (corresponding to the voltage width of one bit), and when the digital data n _d is 10 bits, it is expressed by the following formula (13).

Next, in the equation (11), the data line voltage Vd (the data line detection voltage Vmeas(t), the convergence value V ₀ -Vth of the data line voltage Vd, and the sum of the current amplification factor β and the capacitance component are C. The parameters β/C formed are each defined as the following equations (14) and (15).

Here, the digital output (detection data) of the ADC 43 with respect to the data line voltage Vd (data line detection voltage Vmeas(t)) during the relaxation time t is defined as n _meas (t) (and the digital value of the threshold voltage Vth) information is defined as the n _th.

ξ:=(β/C)‧ΔV ...(15)

Then, according to the definitions shown in the equations (14) and (15), the equation (11) is replaced with the actual digital data (image data) input to the DAC 42 of the DAC/ADC circuit 144 of the data driver 140. _{The relationship between d} and the digital data (detection data) n _meas (t) actually outputted by the analog-digital conversion by the ADC 43 can be expressed by the following equation (16).

In the equations (15) and (16), ξ is the digital representation of the parameter β/C in the analog value, and ξ×t is dimensionless. Here, the threshold voltage Vth ₀ at which the threshold voltage Vth of the transistor Tr13 does not fluctuate (Vth shift) is set to about 1 V. At this time, in order to satisfy the condition of ξ×t×(n _d −n _th )>>1, by setting the two mitigation times t=t ₁ and t ₂ , the threshold value of the transistor Tr13 is met. The compensation voltage component (bias voltage) Voffset(t ₀ ) of the voltage fluctuation can be expressed by the following formula (17).

In the above formula (17), n ₁ and n ₂ are each a case where the relaxation time t is set to t ₁ and t ₂ in the equation (16), and the digital data (detection data) n _meas (t) output from the ADC 43. ₁ ), n _meas (t ₂ ). Then, according to the equations (16) and (17), the digital data of the threshold voltage Vth of the transistor can be used for the digital data n _meas (t ₀ ) output from the ADC 43 at the relaxation time t=t ₀ . It is represented by the following formula (18). Further, the digital data digital Voffset of the bias voltage Voffset can be expressed by the following equation (19). In the equations (18) and (19), <ξ> is the full-pixel average of the value of the parameter β/C. Here, <ξ> does not consider values below the decimal point.

Therefore, according to the above formula (18), the digital data (corrected data) n _{th for} correcting the threshold voltage Vth of the entire pixel portion can be obtained.

Further, the variation of the current amplification factor β is a transition curve shown in FIG. 9, and the digital data (detection data) n _meas (t) output from the ADC 43 when the relaxation time t is set to t ₃ is used to resolve the first The formula (16) can be expressed by the following formula (20). Here, t ₃ is set to be much smaller than the time t ₀ , t ₁ , and t ₂ used in the above equations (17) and (18).

In the above formula (20), the display panel (light-emitting panel) is designed such that the sum C of the capacitance components of the respective data lines Ld becomes equal, and the number is determined in advance as shown in the above formula (13). The bit width of the data is ΔV, whereby ΔV and C of the formula (15) defined by ξ become constant.

Then, if the desired set values of ξ and β are each set to ξtyp and βtyp, and if the square of the deviation is omitted, the multiplication correction value for correcting the deviation between the illuminating drive circuits DC of the pixels in the display panel 110 is corrected. Δξ, that is, the digital data (corrected data) Δβ for correcting the deviation of the current amplification factor β can be defined by the following formula (21).

Therefore, the correction data n _th (first characteristic parameter) for correcting the variation of the threshold voltage Vth in the light-emitting drive circuit DC, and the correction data Δβ for correcting the deviation of the current amplification factor β (the second characteristic parameter) The data line voltage Vd (the data line detection voltage Vmeas(t)) can be detected a plurality of times by changing the relaxation time t in one of the above-described series automatic zeroing methods according to the equations (18) and (21). And seek.

Further, the acquisition processing of the correction data n _th and Δβ as described above is executed by the correction data acquisition function circuit 156 of the controller 150a as shown in Fig. 5.

Next, in the controller 150a shown in FIG. 5, the specific image data supplied from the outside (hereafter referred to as "digital data for luminance measurement: first image data") n _d , according to By using the correction data n _th and Δβ calculated by the above equations (18) and (21), a series of arithmetic processing shown below is applied to generate luminance measurement video data n _{d — brt} and input to the data driver 140. The display panel 110 (pixel PIX) is voltage-driven.

Specifically, the method of generating the luminance measurement video data n _{d — brt} is performed by performing correction correction (Δβ multiplication correction) of the current amplification factor β and variation correction of the threshold voltage Vth for the digital data n _d for luminance measurement (n). _Th addition correction).

First, in the multiplication function circuit 153a of the controller 150a, the digital data n _{d is} multiplied by the correction data Δβ (n _d × Δβ) for correcting the deviation of the current amplification factor β.

Next, in the addition function circuit 154a, the digital data (n _d × Δβ) subjected to the multiplication processing is added with correction data n _th ((n _d × Δβ) + n for correcting the variation of the threshold voltage Vth. _Th )

Then, the digital data ((n _d × Δβ) + n _th ) to which these correction processes have been applied is supplied as the luminance measurement video data n _{d — brt} to the data register circuit 142 of the data driver 140.

The data driver 140 converts the luminance measurement video data n _{d — brt} taken into the data register circuit 142 into an analog signal voltage by the DAC 42 of the DAC/ADC circuit 144.

Here, as shown in FIG. 4, since the output input characteristics (conversion characteristics) of the DAC 42 and the ADC 43 are set to be the same, the gray scale voltage (second voltage) V _{brt for} luminance measurement generated by the DAC 42 is based on The definition shown in the formula (14) is defined as the following formula (22). This gray scale voltage V _brt is supplied to the pixel PIX via the data line Ld.

V _brt =V _{1 -ΔV} (n _brt -1)...(22)

In this manner, a series of correction processes are performed on the specific image data to generate the gray scale voltage V _{brt for} luminance measurement and written in the display panel 110, whereby the light-emitting drive circuit DC from each pixel PIX can be The current value of the light-emission drive current Iem flowing to the organic electroluminescence element OEL is set to a constant value without being affected by the variation of the current amplification factor β with respect to the set value or the variation of the threshold voltage Vth of the drive transistor. Then, in this state, the display panel 110 is caused to emit light, and the light emission luminance Lv (cd/m ² ) of each pixel PIX is measured.

Here, as for the method of measuring the luminance of each pixel PIX, for example, the following method can be applied.

In other words, as an example of the method of measuring the luminance of each pixel PIX, first, each pixel PIX arranged on the display panel 110 is simultaneously illuminated by the luminance gray scale corresponding to the gray scale voltage V _brt for luminance measurement.

Next, as shown in FIG. 5, the display panel 110 is imaged by a luminance meter or a CCD camera 160 disposed on the emission surface side of the display panel 110, wherein the emission surface side emits light emitted from each pixel PIX of the display panel 110. The outside side. Here, the luminance meter or the CCD camera 160 uses a resolution higher than the size of each pixel PIX arranged on the display panel 110. Then, the region corresponding to each pixel PIX is associated with the luminance data output from the luminance meter or CCD camera 160 from the acquired video signal. Then, a predetermined number of luminance data is extracted from the high luminance side of the plurality of luminance data corresponding to each pixel PIX region, and an average value of the luminance values is calculated, thereby determining the luminance (luminance value) Lv of the luminance of each pixel PIX.

Here, in the case where the luminous current efficiency of the organic electroluminescent element OEL is set to η, since

ξ = (brightness) / (current density)

In this case, if the current value of the light-emission drive current flowing through each pixel PIX is a constant value, the deviation of the light-emitting luminance in the display panel 110 from the set value can be regarded as a deviation of the light-emitting current efficiency η.

Then, when the respective set values of the light-emission luminance Lv and the light-emission current efficiency η are Lv _typ and η _typ , if the square of the deviation is omitted, the luminance Lv of each pixel PIX in the display panel 110 is corrected. The multiplication correction value ΔLv of the deviation, that is, the digital data (correction data: third characteristic parameter) Δη for correcting the deviation of the luminous current efficiency η can be defined by the following formula (23).

Therefore, as described above, the correction data Δη of the luminous current efficiency η can be obtained from the luminous luminance Lv measured for each pixel PIX.

Here, the arithmetic processing for correcting the correction data Δη of the variation of the light-emission luminance Lv shown in the equation (23) is to use the correction for correcting the current amplification factor β as shown in the equation (21). The correction data Δβ is processed in the same order as the arithmetic processing.

Then, the correction data Δβ obtained by the above equations (21) and (23) are multiplied by Δη, whereby the current amplification factor β and the correction are defined as shown in the following equation (24). Correction data (fourth characteristic parameter) Δβ _η of the deviation of both the luminous current efficiency _η .

△β _η :=△η×△β...(24)

The correction data n _th and Δβ _η calculated by the above equations (18) and (24) are applied to the image data n _d input from the outside of the display device 100 of the present embodiment in a display operation to be described later. The correction of the deviation of the current amplification factor β (Δβ multiplication correction) and the variation correction of the threshold voltage Vth (n _th addition correction) are used when the corrected image data n _{d — comp} is generated.

Therefore, since the gray scale voltage Vdata _{corresponding to} the analog voltage value of the image data n _{d_comp is} supplied from the data driver 140 to the respective pixels PIX via the data line Ld, the organic electroluminescence element OEL of each pixel PIX can be made to have a desired brightness gray. The step of performing the light-emitting operation is not affected by the variation of the current amplification factor β or the luminous current efficiency η or the variation of the threshold voltage Vth of the driving transistor, and a good and uniform light-emitting state can be achieved.

Next, the characteristic parameter obtaining operation to which the above-described automatic zeroing method is applied in connection with the device configuration of the present embodiment will be described.

In the following description, the description of the same operations as the above-described characteristic parameter obtaining operation will be simplified or omitted.

First, the correction made in the variation of the threshold voltage Vth of the drive transistor of each pixel PIX n _th correction data △ β and the correction information of each pixel PIX current amplification factor beta] of the bias for correcting for the.

Fig. 10 is a timing chart (1) showing the characteristic parameter obtaining operation of the display device of the embodiment.

Fig. 11 is a view showing the operation of the voltage applying operation for detection of the display device of the embodiment.

Fig. 12 is a view showing the operation of the natural mitigation operation of the display device of the embodiment.

Fig. 13 is a view showing the operation of the data line voltage detecting operation of the display device of the embodiment.

Fig. 14 is a view showing the operation of the detection data sending operation of the display device of the embodiment.

Further, Fig. 15 is a functional block diagram showing a correction data calculation operation of the display device of the embodiment.

Here, in FIGS. 11 to 14 , as the configuration of the data driver 140, the illustration of the shift register circuit 141 is omitted for convenience of illustration.

In the operation of obtaining the characteristic parameters (correction data n _th and Δβ) of the present embodiment, as shown in FIG. 10, each pixel PIX of each column is set to include the detection voltage application in the predetermined characteristic parameter acquisition period Tcpr. The period T ₁₀₁ , the natural relaxation period T ₁₀₂ , the data line voltage detection period T _{103 ,} and the detection data transmission period T ₁₀₄ .

Here, the natural relaxation period T ₁₀₂ corresponds to the above-described relaxation time t. In the tenth diagram, although the relaxation time t is set to one time for convenience of illustration, as described above, in the present embodiment, the relaxation time t is different, and the data line voltage Vd (data line) is detected. The detection voltage Vmeas(t) is repeated several times. Therefore, actually, the data line voltage detecting operation (data line voltage detecting period T ₁₀₃ ) is repeatedly performed during the respective relaxation times t (= t ₀ , t ₁ , t ₂ , t ₃ ) in the natural relaxation period T ₁₀₂ . And the detection data sending action (detection data sending period T ₁₀₄ ).

First, in the detection voltage application period T ₁₀₁ , as shown in FIGS. 10 and 11 , the pixel PIX (the pixel PIX in the first column in the figure) which is the target of the characteristic parameter acquisition operation is set to the selected state. That is, the selection signal Ssel of the selection level (high level: Vgh) is applied from the selection driver L2 to the selection line Ls to which the pixel PIX is connected, while the low level is applied from the power source driver 130 to the power source line La (non-light emission level: DVSS) = Ground potential GND) Supply voltage Vsa.

Then, in this selection state, the switch SW1 provided in the output circuit 145 of the data driver 140 is turned on in accordance with the switching control signal S1 supplied from the controller 150a, thereby connecting the data line Ld(j) and the DAC/ADC144. DAC42(j).

Further, based on the switching control signals S2 and S3 supplied from the controller 150a, the switch SW2 provided in the output circuit 145 is turned off, and the switch SW3 connected to the contact Nb of the switch SW4 is turned off.

Further, according to the switching control signal S4 supplied from the controller 150a, the switch SW4 provided in the material latch circuit 143 is set to be connected to the contact Na, and the switch SW5 is set to and the contact point Na according to the switching control signal S5. connection.

Then, the digital data n _{d for} generating the detection voltage Vdac of a predetermined voltage value is sequentially taken into the data register circuit 142 from the outside of the data driver 140, and then held in the data latch via the switch SW5 corresponding to each row. 41(j).

Then, the digital data n _d held by the data latch 41(j) is input to the DAC 42(j) of the DAC/ADC circuit 144 via the switch SW4 for analog conversion, and is applied to the data line Ld(j) of each row as the detection voltage. Vdac.

Here, the detection voltage Vdac is set to a voltage value satisfying the condition of the above formula (12) as described above. In the present embodiment, since the power source voltage DVSS applied from the power source driver 130 is set to the ground potential GND, the detection voltage Vdac is set to a negative voltage value. Further, the digital data n _{d for} generating the detection voltage Vdac is previously stored in a memory provided in, for example, the controller 150a.

Therefore, the transistors Tr11 and Tr12 provided in the light-emitting drive circuit DC constituting the pixel PIX are turned on, and the low-level power supply voltage Vsa (=GND) is applied to the gate terminal of the transistor Tr13 and the capacitor Cs via the transistor Tr11. One end side (connection point N11).

Moreover, the detection voltage Vdac applied to the data line Ld(j) is applied to the source terminal of the transistor Tr13 and the other end side (connection point N12) of the capacitor Cs via the transistor Tr12.

In this manner, by applying a potential difference larger than the threshold voltage Vth of the transistor Tr13 between the gate and the source terminal of the transistor Tr13 (that is, both ends of the capacitor Cs), the transistor Tr13 is turned on. And the drain current Id corresponding to this potential difference (gate voltage, source-to-source voltage Vgs).

At this time, since the potential of the source terminal of the transistor Tr13 (detection voltage Vdac) is set lower than the potential of the 汲 terminal (ground potential GND), the drain current Id is from the power supply voltage line La via the transistor Tr13. The connection point N12, the transistor Tr12, and the data line Ld(j) flow toward the data driver 140.

Further, both ends of the capacitor Cs connected between the gate and the source of the transistor Tr 13 are charged with a voltage corresponding to the potential difference according to the gate current Id.

At this time, since a voltage lower than the voltage ELVSS (= GND) applied to the cathode (common electrode Ec) is applied to the anode (connection point N12) of the organic electroluminescent element OEL, the current does not flow to the organic electro The light-emitting element OEL does not perform a light-emitting operation.

Subsequently, during the natural relaxation T ₁₀₂ T ₁₀₁ period after completion of the detection voltage is applied, as in FIG. 10, as shown in FIG. 12, the pixel PIX in the selected state is held in the state, is supplied from the controller 150a according to the The switching control signal S1 causes the switch SW1 of the data driver 140 to be turned off, thereby separating the data line Ld(j) from the data driver 140 and stopping the output of the detection voltage Vdac from the DAC 42(j).

Further, similarly to the above-described detection voltage application period _T101 , the switches SW2 and SW3 are turned off, the switch SW4 is set to be connected to the contact Nb, and the switch SW5 is set to be connected to the contact Nb.

Thereby, since the transistors Tr11 and Tr12 are kept in the on state, the pixel PIX (light-emitting drive circuit DC) is kept in electrical connection with the data line Ld(j), but the voltage is applied to the data line Ld(j) by the cutoff. Therefore, the other end side (connection point N12) of the capacitor Cs is set to a high impedance state.

In the natural relaxation time T _102, by during the application of voltage above the detecting T ₁₀₁ by the charging to the capacitor Cs (transistor Tr13 of the gate, the source between) the voltage, the transistor Tr13 holding a conductive state, while the drain The pole current Id continues to flow.

Then, the potential of the source terminal side (connection point N12: the other end side of the capacitor Cs) of the transistor Tr13 gradually rises to approach the threshold voltage Vth of the transistor Tr13.

Therefore, as shown in Fig. 9, the potential of the data line Ld(j) also changes to converge to the threshold voltage Vth of the transistor Tr13.

Further, in this natural relaxation period T _102, also because of the potential of the anode of the organic electroluminescent element OEL of (the connection point N12) is施加比施加cathode (common electrode Ec) voltage ELVSS (= GND) lower voltage, Therefore, the current does not flow to the organic electroluminescent element OEL, and the light-emitting operation is not performed.

Subsequently, during a data line voltage detecting T _103, T _102, at a point of time after a predetermined relaxation time t, as in FIG. 10, the natural relaxation period, as shown, held in the pixels PIX in the selected state in FIG. 13 In the state, the switch SW2 of the data driver 140 is turned on in accordance with the switching control signal S2 supplied from the controller 150a. At this time, the switches SW1 and SW3 are turned off, the switch SW4 is set to be connected to the contact Nb, and the switch SW5 is set to be connected to the contact Nb.

Therefore, the data line voltage Vd connecting the data line Ld(j) and the ADC 43(j) of the DAC/ADC 144 at the time point when the natural relaxation period T ₁₀₂ passes the predetermined relaxation time t is via the switch SW2 and the buffer 45(j). Take in ADC43(j). Here, the data line voltage Vd taken into the ADC 43(j) corresponds to the data line detection voltage Vmeas(t) shown in the above formula (11).

Then, the data line detection voltage Vmeas(t) composed of the analog signal voltage taken in by the ADC 43(j) is converted into the detection data n _meas composed of the digital data in the ADC 43(j) according to the equation (14). (t) is held by the data latch 41(j) via the switch SW5.

Next, in the detection data delivery period T ₁₀₄ , as shown in FIGS. 10 and 14 , the pixel PIX is set to a non-selected state.

That is, the selection signal Ssel of the non-selected level (low level: Vgl) is applied to the selection line Ls from the selection driver 120. In this non-selected state, the switch SW5 provided in the input section of the data latch 41(j) of the data drive 140 is set to be connected to the contact Nc according to the switching control signals S4, S5 supplied from the controller 150a, and is set. The switch SW4 of the output section of the data latch 41 (j) is set to be connected to the contact Nb. Further, the switch SW3 is turned on in accordance with the switching control signal S3. At this time, the switches SW1 and SW2 perform the OFF operation in accordance with the switching control signals S1 and S2.

Thus, the data latches 41(j) of the rows adjacent to each other are connected in series via the switches SW4, SW5, and are connected to the external controller 150a via the switch SW3.

Then, based on the data latch pulse signal LP supplied from the controller 150a, the detection data n _meas (t) held by the data latch 41 (j+1) of each row (refer to FIG. 3) is sequentially transferred to Adjacent data latch 41(j).

Therefore, the detection data n _meas (t) of the pixel PIX of one column is output as the serial data, as shown in FIG. 15 , and supplied to the controller 150 a , and is stored in the control in a manner corresponding to each pixel PIX. The predetermined memory area of the memory 155 of the device 150a.

Here, the fluctuation amount of the threshold voltage Vth of the transistor Tr13 provided in the light-emitting drive circuit DC of each pixel PIX differs depending on the driving experience (light-emitting experience) of each pixel PIX, and the current amplification factor β is also Since each pixel PIX has a deviation from the set value, the detection data n _meas (t) inherent to each pixel PIX is stored in the memory 155.

In the above-described series of operations, the data line voltage detecting operation and the detected data sending operation are set to different mitigating times t (= t0, t1, t2, and t3) to perform a plurality of times for each pixel PIX. . Here, as described above, the operation of detecting the data line voltage at the different relaxation time t may be at a different timing t during the period in which the detection voltage is applied only once and the natural relaxation is continued (duration time t=t0). , t1, t2, t3) The data line voltage detection operation and the detection data are sent out for a plurality of times, and the relaxation time t is different, and the detection voltage is applied, the natural mitigation, the data line voltage detection, and the detection data are sent out. The action is executed multiple times.

The characteristic parameter obtaining operation for each of the pixels PIX shown in the above is repeated, and the plurality of pieces of detection data n _meas (t) are stored in the memory 155 of the controller 150a for the all-pixel PIX arranged on the display panel 110.

Then, based on the detection data n _meas (t) of each pixel PIX, a correction data n _th for correcting the threshold voltage Vth of the transistor (driving transistor) Tr13 of each pixel PIX and a correction current amplification factor β are performed. The correction data Δβ is calculated.

Specifically, as shown in Fig. 15, first, the correction data acquisition function circuit 156 provided in the controller 150a reads the detection data n _meas (t) corresponding to each pixel PIX stored in the memory 155.

Then, the correction data acquisition function circuit 156 obtains the correction data n _th according to the above-described equations (15) to (21) in accordance with the characteristic parameter acquisition operation using the automatic zeroing method described above (specifically, the correction is specified). The data n _th is detected by n _meas (t ₀ ) and the bias voltage (-Voffset=-1/ξ×t ₀ ) and the corrected data Δβ. The corrected data n _th and Δβ are calculated to correspond to each pixel PIX. The way is remembered in the established memory area of the memory 155.

Next, using the correction data n _th and Δβ, the correction data Δη for correcting the variation in the luminous current efficiency η of each pixel PIX is obtained.

Fig. 16 is a timing chart (2) showing the characteristic parameter obtaining operation of the display device of the embodiment.

Fig. 17 is a functional block diagram showing an operation of generating image data for luminance measurement of the display device of the embodiment.

Fig. 18 is a view showing the operation of the writing operation of the image data for luminance measurement of the display device of the embodiment.

Fig. 19 is a view showing the operation of the light-emitting operation for luminance measurement of the display device of the embodiment.

Fig. 20 is a functional block diagram (2) showing the correction data calculation operation of the present embodiment.

Here, in FIGS. 18 and 19, as the configuration of the data driver 140, the shift register circuit 141 is omitted for display for convenience of illustration.

As shown in FIG. 16, the characteristic parameter (correction data Δη) acquisition operation of the present embodiment is set to include image data for luminance measurement in which image data for luminance measurement corresponding to the pixel PIX of each column is generated and written. The writing period T _{201 is} a light-emitting period T ₂₀₂ for luminance measurement in which each pixel PIX performs a light-emitting operation in accordance with the luminance gray scale of the image data for luminance measurement, and a light-emitting luminance measurement period T _{203 for} measuring the light-emitting luminance of each pixel. Here, the luminance measurement illumination period T ₂₀₂ includes the emission luminance measurement period T ₂₀₃ , and the measurement of the emission luminance is performed in the luminance measurement illumination period T ₂₀₂ .

In the luminance measurement video data writing period T ₂₀₁ , the operation of generating the luminance measurement video data and the luminance measurement video data are performed in the respective pixels PIX.

The image data for luminance measurement is generated by the controller 150a, and the corrected data Δβ and n _th obtained by the above-described characteristic parameter obtaining operation are corrected for the predetermined luminance measurement digital data n _d to generate a luminance measurement image. Information n _{d_brt} .

Specifically, as shown in Fig. 17, first, the correction data Δβ of each pixel stored in the memory 155 of the controller 150a is read.

Then, the multiplication function circuit 153a performs multiplication processing of the read correction data Δβ on the digital data n _d supplied from the outside of the controller 150a.

Then, based on the equations (18) and (19), the detection data n _meas (t ₀ ) and the bias voltage (-Voffset = -1/(ξ) of the predetermined correction data nth stored in the memory 155 are read. ×t ₀ )).

Then, the addition function circuit 154a performs addition processing of the read detection data n _meas (t) and the bias voltage (-Voffset) on the multiplied digital data (n _th × Δβ). By performing the above correction processing, the luminance measurement video data n _{d — brt is generated} and supplied to the data driver 140.

In the same manner as the above-described detection voltage application operation (detection voltage application period _T101 ), the operation of the luminance measurement video data is performed in the state in which the pixel PIX to be written is set to the selected state. The luminance measurement gray scale voltage V _{brt corresponding to} the luminance measurement video data n _{d — brt is} written via the data line Ld (j).

Specifically, as shown in FIGS. 16 and 18, first, a selection signal Ssel of a selected level (high level: Vgh) is applied to the selection line Ls to which the pixel PIX is connected, and a low level is applied to the power line La. The power supply voltage Vsa of the quasi (non-light-emitting level: DVSS = ground potential GND).

In this case, the switch SW1 is turned on, and the switches SW4 and SW5 are set to be connected to the contact Nb, whereby the brightness measurement image data n _{d_brt} supplied from the controller 150a is sequentially taken into the data. The memory circuit 142 is held by the data latch 41(j) corresponding to each row.

The held image data n _{d_brt} is analog-converted by the DAC 42 (j) and applied to the data line Ld (j) of each row as the gray scale voltage V _brt for luminance measurement. The gray scale voltage V _{brt for} luminance measurement is set to a voltage value satisfying the condition of the above formula (22) as described above.

Therefore, in the light-emitting drive circuit DC constituting the pixel PIX, a low-level power supply voltage Vsa (= GND) is applied to the gate terminal of the transistor Tr13 and one end side (connection point N11) of the capacitor Cs, and, again, the transistor Tr13 The source terminal and the other end side of the capacitor Cs (connection point N12) apply the luminance measurement gray scale voltage V _brt .

Therefore, the drain current Id corresponding to the potential difference (gate and source-to-source voltage Vgs) generated between the gate and the source terminal of the transistor Tr13 flows, and the light-emitting voltage corresponding to the potential difference according to the gate current Id ( V brt) charges both ends of the capacitor Cs.

At this time, since a lower voltage is applied to the anode (connection point N12) of the organic electroluminescence element OEL than the cathode (common electrode Ec), the organic electroluminescence element OEL does not flow a current, and does not perform a light-emitting operation.

Next, in the luminance measurement light-emitting period T ₂₀₂ , as shown in FIG. 16, the pixel PIX of each column is set to a non-selected state, and each pixel PIX is simultaneously illuminated.

Specifically, as shown in FIG. 19, a selection signal Ssel of a non-selected level (low level: Vgl) is applied to the selection line Ls connected to the full pixel PIX of the display panel 110, and a high level is applied to the power line La. The power supply voltage Vsa of the quasi (light level: ELVDD > GND).

Therefore, the transistors Tr11 and Tr12 provided in the light-emitting drive circuit DC of each pixel PIX are turned off, and the light-emission voltage charged to the capacitor Cs connected between the gate and the source of the transistor Tr 13 is held.

Therefore, the illuminating voltage charged to the capacitor Cs is utilized ( Vbrt) maintains the gate voltage and the source-to-source voltage Vgs of the transistor Tr13, and the transistor Tr13 conducts the conduction operation to flow the drain current Id, and the potential of the source terminal (connection point N12) of the transistor Tr13 rises.

Then, the potential of the source terminal (connection point N12) of the transistor Tr13 rises to be higher than the voltage ELVSS (=GND) applied to the cathode (common electrode Ec) of the organic electroluminescent element OEL, and is organically induced. The light emitting element OEL applies a forward bias. Therefore, the light-emission drive current Iem flows from the power supply line La through the transistor Tr13, the connection point N12, and the organic electroluminescent element OEL in the direction of the common electrode Ec, and the organic electroluminescent element OEL performs a light-emitting operation. The light-emission drive current Iem is a light-emitting voltage of the capacitor Cs that is written in the pixel PIX and held between the gate and the source of the transistor Tr 13 in accordance with the write operation of the image data for luminance measurement ( Since the voltage value of V brt is defined, the organic electroluminescent element OEL emits light in response to the luminance gray scale of the luminance measurement image data n _{d — brt} .

Here, the luminance measurement video data n _{d_brt is subjected to} the above-described characteristic parameter acquisition operation, and the correction of the current amplification factor β and the drive power are performed based on the correction data Δβ and n _th acquired so as to correspond to the respective pixels. The variation of the threshold voltage Vth of the crystal is corrected.

Therefore, by writing the luminance measurement video data n _{d — brt of the} same luminance gray scale value to each pixel PIX, the current value of the light-emission drive current Iem flowing from the light-emitting drive circuit DC of each pixel PIX to the organic electroluminescence element OEL is obtained. It is not affected by the variation of the current amplification factor β or the fluctuation of the threshold voltage Vth of the driving transistor, and is set to a substantially constant value.

Next, in the luminance luminance measurement period T ₂₀₃ set in the luminance measurement illumination period T ₂₀₂ , the measurement operation of the luminance of each pixel PIX and the correction data Δη for correcting the luminance current efficiency η of each pixel PIX are performed. Calculate the action.

As shown in FIG. 16 and FIG. 20, in the pixel PIX of the display panel 110, the light-emission drive current Iem having substantially the same current value flows through the organic electroluminescent element OEL, and each of the pixels PIX of the display panel 110 is operated. In a state in which the organic electroluminescence element OEL of the pixel PIX performs a light-emitting operation, the luminance Lv of each pixel PIX is measured as digital data by a luminance meter or a CCD camera 160 provided on the emission surface side of the display panel 110. The measured light-emission luminance Lv is transmitted to the correction material acquisition function circuit 156 of the controller 150a.

In the correction data acquisition function circuit 156 provided in the controller 150a, the correction data Δn is calculated based on the equations (23) and (24), and the correction data Δ is calculated. [eta] of adding the correction data △ β correction data △ β _η. Here, the arithmetic processing of the correction data Δη shown in the above formula (23) is executed in the same order as the arithmetic processing of the correction data Δβ shown in the above equation (23). The calculated correction data Δβ _η is stored in the predetermined memory area of the memory 155 so as to correspond to each pixel PIX, similarly to the above-described detection data n _meas (t) or the correction data n _th .

(display action)

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

In the light-emitting operation of the display device, the correction data n _th and Δβ _{η are} used to correct the image data, and each pixel PIX is caused to emit light at a desired gray scale.

Fig. 21 is a timing chart showing the light-emitting operation of the display device of the embodiment.

Fig. 22 is a functional block diagram showing the correction operation of the image data of the display device of the embodiment.

Fig. 23 is a view showing the operation of the image data writing operation after the correction of the display device of the embodiment.

Fig. 24 is a view showing the operation of the light-emitting operation of the display device of the embodiment.

Here, in the 23rd and 24th drawings, as the configuration of the data driver 140, the illustration of the shift register circuit 141 is omitted for convenience of illustration.

As shown in FIG. 21, the display operation of the present embodiment is set to include a video data writing period T _{301 in} which desired image data is generated in correspondence with the pixels PIX of the respective columns, and the corresponding image is used. during the light emission luminance gray scale pixel data of each pixel PIX perform the light emitting operation T _302.

In the video data writing period T ₃₀₁ , the operation of correcting the image data generation and the operation of correcting the image data writing to each pixel PIX are performed.

The correction image data generation operation is performed by the controller 150a, and the correction data Δβ, Δη, and n _th obtained by the above-described characteristic parameter acquisition operation are corrected for the predetermined image data n _d composed of the digital data. The image data (corrected image data) n _{d — comp that} has been subjected to the correction processing is supplied to the data driver 140.

Specifically, as shown in FIG. 22, in the voltage amplitude setting function circuit 152a, image data (second image data) n _d including luminance gradation values of RGB colors supplied from the outside of the controller 150a is provided. The voltage amplitude corresponding to each color component of RGB is set by referring to the reference table 151.

Next, the correction data Δβ _η of each pixel stored in the memory 155 is read, and the multiplication function 153a multiplies the read correction data Δβ _η for the video data n _{d of the} set voltage.

Then, the detection data n _meas (t ₀ ) and the bias voltage (-Voffset=-1/(ξ×t ₀ )) of the predetermined correction data n _th memorized by the memory 155 are read, and are added in the addition function circuit 154a. The digitized data (n _d × Δβ _η ) subjected to the multiplication processing is subjected to addition processing of the read detection data n _meas (t) and the bias voltage (-Voffset).

The corrected image data n _{d — comp is} generated by performing the above-described series of correction processes and supplied to the data driver 140.

In addition, in the state in which the pixel PIX to be written is set to the selected state, the grayscale voltage of the image data n _{d_comp} is corrected by the data line Ld (j). Vdata.

Specifically, as shown in FIGS. 21 and 23, first, a selection signal Ssel of a selection level (high level: Vgh) is applied to the selection line Ls to which the pixel PIX is connected, and a low level is applied to the power source line La. The power supply voltage Vsa (non-light-emitting level: DVSS = ground potential GND).

In this state, the switch SW1 is turned on, and the switches SW4 and SW5 are set to be connected to the contact Nb, whereby the corrected image data n _{d_comp} supplied from the controller 150a is sequentially taken into the data register. Circuit 142 is held by data latch 41(j) corresponding to each row.

The held image data n _{d_comp} is analog-converted by the DAC 42 (j) and applied to the data line Ld (j) of each row as the gray scale voltage (third voltage) Vdata. Here, the gray scale voltage Vdata is set to the following equation (25) according to the definition shown in the above formula (14).

Vdata=V ₁ -ΔV(n _{d_comp} -1)) (25)

Therefore, in the light-emitting drive circuit DC constituting the pixel PIX, a low-level power supply voltage Vsa (= GND) is applied to the gate terminal of the transistor Tr13 and one end side (connection point N11) of the capacitor Cs, and the source of the transistor Tr13 is applied. The other end side (connection point N12) of the terminal and the capacitor Cs _applies a gray scale voltage Vdata corresponding to the corrected image data n _{d — comp} .

Therefore, the drain current Id corresponding to the potential difference (gate and source-to-source voltage Vgs) generated between the gate and the source terminal of the transistor Tr13 flows, and the light-emitting voltage corresponding to the potential difference according to the gate current Id (=Vdata) charges both ends of the capacitor Cs. At this time, since a lower voltage is applied to the anode (connection point N12) of the organic electroluminescence element OEL than the cathode (common electrode Ec), the organic electroluminescence element OEL does not flow a current, and does not perform a light-emitting operation.

Next, as shown in FIG. 21, in the pixel light-emitting period _T302 , in a state where the pixels PIX of the respective columns are set to the non-selected state, the respective pixels PIX are simultaneously illuminated.

Specifically, as shown in FIG. 24, a selection signal Sse1 of a non-selected level (low level: Vg1) is applied to the selection line Ls connected to the entire pixel PIX of the display panel 110, and a high level is applied to the power line La. The power supply voltage Vsa of the quasi (light level: ELVDD > GND).

Therefore, the transistors Tr11 and Tr12 provided in the light-emitting drive circuit DC of each pixel PIX are turned off, and the light-emitting voltage of the capacitor Cs connected between the gate and the source connected to the transistor Tr13 is held (= Vdata: gate voltage and source voltage Vgs).

Therefore, when the drain current Id flows to the transistor Tr13, the potential of the source terminal (connection point N12) of the transistor Tr13 rises to a power supply voltage which is applied to the cathode (common electrode Ec) of the organic electroluminescent element OEL. When ELVSS (= GND) is higher, the light-emission drive current Iem flows from the light-emitting drive circuit DC to the organic electroluminescent element OEL, and the organic electroluminescent element OEL performs a light-emitting operation. Since the light-emission drive current Iem is defined based on the voltage value of the light-emitting voltage (=Vdata) held between the gate and the source of the write operation transistor Tr13 of the corrected image data, the organic electroluminescent element OEL is The light-emitting action is performed in _accordance with the brightness gray scale of the image data n _{d_comp} for the brightness measurement.

Further, in the above-described embodiment, as shown in FIGS. 16 and 21, in the operation and display operation for acquiring the correction data Δη, the brightness measurement image data or the corrected image data is written in a specific column (for example, After the operation of the pixel PIX of the first column is completed, the pixel PIX of the column is set to the hold state until the operation of the pixel PIX in which the video data is written in another column (the second column or later) is completed.

Here, in the hold state, the selection signal Ssel of the non-selected level is applied to the selection line Ls of the column, and the pixel PIX is set to the non-selected state, and the power supply voltage Vsa of the non-light-emitting level is applied to the power supply line La, and Set to a non-lighting state.

As shown in Fig. 16 and Fig. 21, the set time of this hold state varies depending on each column.

Further, after the operation of writing the brightness measurement image data or the corrected image data to the pixels PIX of the respective columns is completed, the driving control for causing the pixel PIX to emit the light is performed immediately, and the holding state may not be set.

As described above, in the display device (the light-emitting device including the pixel driving device) and the driving control method of the light-emitting device of the present embodiment, the unique auto-zeroing method is applied to the present invention at different timings ( The mitigation time is a method of taking the data line voltage and converting it into a series of characteristic parameters composed of digital data to obtain a plurality of times.

Therefore, according to the present embodiment, parameters for correcting variations in the threshold voltage of the driving transistor of each pixel and variations in the current amplification ratio of each pixel can be obtained and stored. Therefore, according to the present embodiment, since the correction processing for compensating for the variation of the threshold voltage and the variation of the current amplification ratio of each pixel can be applied to the image data written in each pixel, regardless of the characteristic change or characteristic of each pixel The state of the deviation allows the light-emitting element (organic electroluminescence element) to emit light in accordance with the original brightness gray scale of the image data, thereby realizing active organic electroluminescence with good light-emitting characteristics and uniform image quality. Drive System.

Further, in the above-described embodiment, there is a method of measuring the light emission luminance of each pixel in a state in which a uniform light-emission drive current flows in each pixel. Therefore, according to the present embodiment, it is possible to obtain a parameter for correcting the variation in the luminous current efficiency between the pixels, and to obtain a parameter relating to the correction of the variation of the current amplification ratio between the pixels, and to correct the variation of the luminous current efficiency. Correct the data of the parameters and remember.

Therefore, according to the present embodiment, since the correction processing for shifting the threshold voltage of each pixel and the offset between the current amplification factor and the luminous current efficiency can be applied to the image data written in each pixel, regardless of the characteristics of each pixel The state of the variation or the deviation of the characteristics allows the light-emitting element (organic electroluminescence element) to emit light in response to the original luminance gray scale of the image data.

Further, the processing for calculating the correction data for correcting the variation of the current amplification factor including the luminous current efficiency can be performed in a sequence of one of the controllers 150a including the single correction data acquisition function circuit 156, and the calculation can be performed. Since the processing of the correction data for the fluctuation of the threshold voltage of the drive transistor is compensated for, it is not necessary to provide an individual configuration (function circuit) in accordance with the content of the calculation processing of the correction data, and the device scale of the display device (light-emitting device) can be simplified.

<Second embodiment>

In the first embodiment, the voltage of the light-emitting voltage for charging the capacitor Cs connected between the gate and the source terminal of the driving transistor by the writing operation to the pixel PIX during the image data writing period will be described. The value is the same during the writing period and during the lighting period.

However, the voltage value of the illuminating voltage is actually affected by the voltage variation of each signal line due to the capacitive coupling caused by various parasitic capacitances (capacitance components) added to the capacitor Cs of the driving transistor. Therefore, the voltage value of the light-emitting voltage fluctuates during the writing period and the light-emitting period.

In addition to the configuration of the first embodiment, the second embodiment is provided with a configuration for correcting the fluctuation of the light-emitting voltage caused by the capacitance value added to the parasitic capacitance (capacitance component) of the driving transistor.

It is to be noted that the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

The display device of the present embodiment has substantially the same configuration as the display device 100 of the first embodiment, and includes a display panel 110 having the same configuration as that of the first embodiment, a selection driver 120, a power source driver 130, and a data driver 140. . Further, the pixel PIX arranged on the display panel 110 has the same configuration as that of the first embodiment.

The configuration of the controller 150b is different from that of the controller 150a of the first embodiment. Hereinafter, differences from the first embodiment will be mainly described.

Fig. 25 is a functional block diagram showing the function of a controller applied to the display device of the embodiment.

As shown in FIG. 25, the controller (image data correction circuit) 150b of the present embodiment has a voltage amplitude setting function circuit (image data correction circuit) 152b including a reference table (LUT: unique parameter setting circuit) 151, and Multiplication function circuits (image data correction circuits) 153b, 157a, 157b, addition function circuit (image data correction circuit) 154b, memory (memory circuit) 155, correction data acquisition function circuit (characteristic parameter acquisition circuit) 156, and K parameter setting Circuit (inherent parameter setting circuit) 158.

In the configuration of Fig. 25, the multiplication function circuits (image data correction circuits) 157a and 157b and the K parameter setting circuit (inherent parameter setting circuit) 158 are further provided in the configuration of Fig. 5 of the first embodiment.

Further, the functions of the voltage amplitude setting function circuit 152b, the multiplying function circuit 153b, and the adding function circuit 154b are partially different from those of the voltage amplitude setting function circuit 152a, the multiplying function circuit 153a, and the adding function circuit 154a of the first embodiment.

The voltage amplitude setting function circuit 152b converts the voltage amplitudes corresponding to the respective colors of red (R), green (G), and blue (B) by referring to the reference table 151 for the image data composed of the digital data supplied from the outside. The maximum value of the voltage amplitude of the image data converted by the voltage amplitude setting function circuit 152b is set to be smaller than the value of the correction amount of the characteristic parameter of each pixel from the maximum value of the input range of the DAC 42 described above. Here, the reference table 151 referred to by the voltage amplitude setting function circuit 152b corrects the fluctuation of the light-emitting voltage caused by the parasitic capacitance (capacitance component) added to the driving transistor provided in each pixel PIX as will be described later. The mode preset conversion table (γ table). Further, the conversion table set in the reference table 151 will be described in detail later.

Further, the voltage amplitude setting function circuit 152b has a through function or a bypass path for directly outputting the input digital data. Further, when the characteristic parameter obtaining operation of the automatic zeroing method described later is applied, the input digital data is set to be directly output without performing the conversion processing using the voltage amplitude of the reference table 151.

The multiplication function circuit 153b multiplies the image data by the correction data Δβ of the current amplification factor β obtained based on the detection data related to the characteristic change of each pixel PIX, or includes the luminance data detected based on the pixel PIX. The correction data Δβ _{η of the} current amplification factor β and the parameter K for correcting the variation of the luminescence voltage Vel defined by the parasitic capacitance of the drive transistor added to each pixel PIX.

The multiplication function circuit 157a multiplies the detection data relating to the characteristic change of each pixel PIX by the parameter K for correcting the variation of the emission voltage Vel of the organic electroluminescent element OEL of each pixel PIX.

The multiplying function circuit 157b multiplies the compensation voltage component (bias voltage) of the threshold voltage Vth of the driving transistor obtained based on the detection data relating to the characteristic change of each pixel PIX by the parameter K of each pixel PIX.

The addition function circuit 154b adds the image data multiplied by the correction data Δβ or Δβ _{n to} the multiplication function circuit 153b, and multiplies the multiplication function circuits 157a and 157b by the parameter K to correlate with the characteristic change of each pixel PIX. The detection data and the compensation voltage component (bias voltage) of the threshold voltage Vth are corrected. Then, the corrected image data is used as the corrected image data and supplied to the data driver 140.

The memory 155 stores the detection data of each pixel PIX sent from the data driver 140 and the correction data acquired by the correction data acquisition function circuit 156 in correspondence with each pixel PIX.

The addition function circuit 154b and the correction data acquisition function circuit 156 read the detection data from the memory 155 during the addition processing of the addition function circuit 154b and the correction data acquisition processing of the correction data acquisition function circuit 156.

The K parameter setting circuit 158 sets a predetermined constant for the parameter K for correcting the fluctuation of the light emission voltage caused by the parasitic capacitance (capacitance component) added to the driving transistor provided in each pixel PIX, in response to the operating state of the controller 150b. .

The K parameter setting circuit 158 sets the parameter K to 1.0 when applying the characteristic parameter obtaining operation of the automatic zeroing method described later. Therefore, in the multiplication function circuit 153b and the addition function circuit 154b, the multiplication correction or the addition correction is performed on the video material (or the digital data) without substantially adding the correction by the parameter K.

Further, when the K parameter setting circuit 158 performs a display operation based on the image information of the image data, the parameter K is set to, for example, 1.1. Therefore, in the multiplication function circuit 153b and the addition function circuit 154b, multiplication correction or addition correction which adds the influence of the parasitic capacitance is performed on the image data (or digital data).

Here, the value of the parameter K set by the K parameter setting circuit 158 can be calculated in advance based on the capacitance value of the parasitic capacitance added to the driving transistor at the design stage of the display panel 110 or each pixel PIX, and is set. The cause is appropriately switched in response to the operating state of the controller 150b. Further, a method of calculating the parameter K will be described later.

Further, in the controller 150b shown in FIG. 5, the correction data acquisition function circuit 156 may be an arithmetic device provided outside the controller 150b.

Further, in the controller 150b shown in FIG. 5, the memory 155 may be an individual memory as long as it stores the detection data and the correction data associated with each pixel PIX.

Further, these memories 155 may be memory devices provided outside the controller 150b.

Further, the image data supplied to the controller 150b extracts, for example, a luminance grayscale signal component from the video signal, and forms the luminance grayscale signal component as a serial data composed of digital signals for each column of the display device 100.

Next, in the pixel PIX having the light-emitting drive circuit DC having the same configuration as that shown in FIG. 6, the organic electroluminescent element OEL when the organic electroluminescent element OEL is emitted after the image data is written will be described. The relationship between the voltage between the anode and the cathode (the voltage across the organic electroluminescent element OEL: the luminescence voltage Vel) and the current flowing from the luminescence drive circuit DC to the organic electroluminescence element OEL (the luminescence drive current Iel).

Fig. 26 is a view showing an operation state of the organic electroluminescence element to which the pixel of the light-emitting drive circuit of the embodiment is applied, when light is emitted.

Fig. 27 is a characteristic diagram showing the relationship between the light-emission voltage and the light-emission drive current of the organic electroluminescence element in the pixel operation operation of the pixel of the embodiment.

In the light-emitting operation of the organic electroluminescent element OEL of the pixel PIX of the present embodiment, as shown in Fig. 26, a selection signal of a non-selected level (low level: Vgl) is applied from the selection driver 120 via the selection line Ls. Ssel, and the pixel PIX is set to a non-selected state.

At this time, the transistors Tr11 and Tr12 of the light-emitting drive circuit DC are turned off, and the gate and the gate terminal of the transistor Tr13 are electrically cut off, and the source terminal (connection point N12) and the data are simultaneously cut off. Line Ld is electrically cut off.

Further, in this non-selected state, the power source voltage is applied from the power source driver 130 to the pixel PIX via the power source line La to the light source level Vsa (= ELVDD).

Therefore, the voltage charged from the above-described image data (gray scale voltage Vdata) to the capacitor Cs (the gate and source voltage Vgs of the transistor Tr13) is maintained, and the 汲 terminal of the transistor Tr13 is connected (the connection point) N13) A power supply voltage ELVDD having a higher potential than the source terminal (connection point N12) is applied.

Therefore, as shown in Fig. 26, the light-emission drive current Iel in response to the gate and source-to-source voltage Vgs of the crystal Tr13 flows from the power source driver 130 to the organic electroluminescent element OEL via the power source line La and the transistor Tr13.

The circuit characteristics of the pixel PIX (light-emitting drive circuit DC and organic electroluminescent element OEL) in this case were verified.

In the writing operation of the image data (grayscale voltage) having the same configuration as that shown in FIG. 7 described above, the voltage between the connection points N11-N12 of the light-emitting drive circuit DC (that is, the gate of the transistor Tr13, The source-to-source voltage Vgs and the voltage across the capacitor Cs determine the current value of the drain current (ie, write current) Id flowing between the drain and the source of the transistor Tr. Ideally, the voltage between the connection points N11-N12 is maintained by the capacitor Cs even when the light is emitted after the end of the writing operation.

However, in the pixel PIX to which the light-emitting drive circuit DC of the present embodiment is applied, the potential applied to the selection signal Ssel of the selection line Ls or the power supply voltage applied to the power supply line La when shifting from the writing operation to the light-emitting operation is performed. Drive control is performed in such a way that the potential of Vsa changes. That is, the potential of the selection signal Ssel changes from Vgh to Vgl, and the potential of the power supply voltage Vsa changes from DVSS to ELVDD.

Therefore, the voltage between the connection points N11-N12 is affected by these potential changes due to capacitive coupling via parasitic capacitances located in the light-emitting drive circuit DC.

Further, in the pixel PIX (light-emitting drive circuit DC) of the present embodiment, when the transfer operation is shifted to the light-emitting operation, the transistor Tr12 is turned off, and the gray-scale voltage Vdata is cut off to the connection point N12 (the transistor Tr13) The application of the source terminal).

Further, during the light-emitting operation, the light-emission drive current Iel flows through the organic electroluminescent element OEL via the connection point N12. Therefore, when the potential of the connection point N12 fluctuates, the voltage between the connection points N11-N12 is also affected by the potential fluctuation of the connection point N12.

The fluctuation of the gate and source-to-source voltage Vgs (voltage between the connection points N11-N12) of the transistor Tr13 means that the light is driven between the drain and the source of the transistor Tr13 through the organic electroluminescent element OEL. The current Iel varies. In other words, it means that the current value of the light-emission drive current Iel is affected by the value of the voltage (light-emitting voltage Vel) across the organic electroluminescent element OEL associated with the potential of the connection point N12.

Further, in the light-emitting drive circuit DC, even when the potential of the connection point N12 fluctuates during the light-emitting operation, the gate voltage and the source-to-source voltage Vgs (the voltage between the connection points N11 and N12) of the transistor Tr13 do not necessarily change. . The fluctuation of the gate voltage and the source voltage Vgs of the transistor Tr13 described above is subjected to the voltage Ve across the organic electroluminescent element OEL only when it is affected by the parasitic capacitance added to the connection point N11 (gate terminal). )Impact.

Further, the light-emitting drive circuit DC of the present embodiment is not a drive control method in which the gate voltage and the inter-source voltage Vgs (voltage between the connection points N11 to N12) of the transistor Tr13 are changed in principle during the light-emitting operation.

Here, the correction method when the light-emission drive current Iel flowing through the organic electroluminescence element OEL depends on the light-emission voltage Vel of the organic electroluminescence element OEL will be described based on the above-described situation.

First, a parameter (a parameter specific to each pixel) K indicating the influence of the parasitic capacitance that changes the gate and source-to-source voltage Vgs of the transistor Tr13 is defined as the following equation (22).

In the above formula (22), C _N11-N12 corresponds to a capacitor Cs connected between the gate and the source of the transistor Tr13. C _N11-N13 corresponds to the gate capacitance of the transistor Tr11 connected between the gate and the drain of the transistor Tr13. C _N11-N14 corresponds to the gate and source capacitance of the transistor Tr11 connected to the gate of the transistor Tr13.

Here, it is assumed that the light-emission drive current Iel flowing through the organic electroluminescent element OEL in the pixel PIX in the light-emitting operation state shown in FIG. 26 has a relationship shown in FIG. 27 with respect to the light-emission voltage Vel.

In Fig. 27, Vst is the light-emission starting voltage, and Vel_max and Iel_max are the light-emitting voltage and the light-emission drive current when the maximum luminance of the pixel PIX is emitted.

As shown in Fig. 27, when the voltage value of the light-emission voltage Vel exceeds the light-emission start voltage Vst, the current value of the light-emission drive current Iel increases substantially linearly as the light-emission voltage Vel rises.

In the present embodiment, when the above definition (the equation (26)) and the relationship between the light-emission voltage Vel and the light-emission drive current Iel (Fig. 27) are included, in the configuration of the controller 150b shown in Fig. 25, The voltage amplitude setting function circuit 152b performs data conversion for adding the parameter K to the video data n _d composed of the digital data input from the outside by referring to the reference table 151.

Fig. 28 is a view for explaining the data conversion processing of the reference table applied to the controller of the embodiment.

As shown in Fig. 28, the reference table applied to the present embodiment is set such that the converted data (output data) n _dout is substantially linear with respect to the input digital data (image data) n _d .

Here, in Fig. 28, SD1 is a change indicating the gate and source-to-source voltage Vgs (i.e., the illuminating voltage Vel corresponding to the organic electroluminescent element OEL) of the transistor Tr13 due to the influence of the parasitic capacitance. The characteristic line of the conversion characteristic when no correction is performed.

Further, SD2 is a characteristic line indicating a correction component of the conversion data corresponding to the amount of fluctuation of the emission voltage Vel of the organic electroluminescent element OEL due to the influence of the parasitic capacitance.

Further, SD3 is a characteristic line indicating a conversion characteristic when the fluctuation of the light-emission voltage Vel of the organic electroluminescent element OEL due to the influence of the parasitic capacitance is corrected.

Here, SD3 is corrected to have a data value in which the correction component indicated by SD2 is added to the conversion data shown in SD1. Specifically, the input digital data n _d is applied to the data shown in the following parameter K is added as the correction data conversion section (27), and outputs converted data as n _dout. Here, ΔV is a voltage width corresponding to one bit of the digital data indicated by the above formula (13).

Further, in the present embodiment, in addition to the above-described data conversion processing of adding the parameter K to the video data n _d by the voltage amplitude setting function circuit 152b, the multiplication function circuit 153b of the controller 150b shown in Fig. 25 and In the addition function circuit 154b, correction processing for adding the parameter K is performed.

Here, the parameter K used in the data conversion processing and the correction processing is set to K=1 when the characteristic parameters (correction data n _1h , Δβ) to which the above-described automatic zeroing method is applied are obtained. Further, when the characteristic parameter obtaining operation for compensating the luminous current efficiency η described later and the display operation of the image information corresponding to the image data executed after the series of characteristic parameter obtaining operations are performed, the parameter K is set to, for example, K=1.1. .

Next, the correction data n _th and Δβ obtained by the characteristic parameter acquisition operation similar to those of the first embodiment described above and the parameter K for compensating for the influence of the parasitic capacitance during the light-emitting operation are used to perform acquisition. The operation of compensating for the characteristic parameter of the luminous current efficiency η of the organic electroluminescent element OEL of each pixel PIX.

Here, first, the controller 150b shown in Figure 25 in, for a particular image data n _d is supplied the external (in this expediency on referred to as "luminance measurement digital data": first image data), in accordance with By using the correction data n _th and Δβ calculated by the equations (18) and (21) and the parameter K defined by the equation (26), a series of arithmetic processing shown below is applied to generate a luminance measurement. Use the image data n _{d_brt} .

Then, it is input to the data driver 140, and the display panel 110 (pixel PIX) is voltage-driven.

Specifically, the luminance measurement video data n _{d_brt} is generated by adding the influence of the parasitic capacitance on the pixel PIX when the luminance measurement digital data n _{d is} added, and performing the voltage amplitude setting and the current amplification ratio β deviation correction ( The Δβ multiplication correction is performed and the fluctuation correction of the threshold voltage Vth (n _th addition correction) is performed.

First, in the voltage amplitude setting function circuit 152b of the controller 150b, the reference table 151 having the conversion characteristics as shown in Fig. 28 is referred to, and the data conversion processing as shown in the equation (27) is performed on the digital data n _d . And generate conversion data n _dout .

Next, in the multiplication function circuit 153b, the digital data (conversion data) n _{dout of the} set voltage amplitude is multiplied by the parameter K for correcting the influence of the parasitic capacitance and the correction data for correcting the deviation of the current amplification factor β. β (K × n _dout × Δβ).

Then, in the addition function circuit 154b, the digital data (K × n _dout × Δβ) which has been multiplied is added, and the parameter K multiplied by the influence of the parasitic capacitance is added to correct the threshold voltage. The correction data of the variation of Vth is K × n _th (= K × n _meas (t) - K × Voffset) (K × (n _dout × Δβ + n _th )).

Further, in the luminance measurement image data n _{d_brt} or the method of generating the corrected image data n _d-comp at the time of the display operation, the voltage amplitude setting function circuit 152b adds the parasitic capacitance in the pixel PIX according to the parameter K. The effect of correcting the deviation of the current amplification factor β in the multiplication function circuit 153b by modifying the digital data (image data) n _d as a method of correcting the illuminating voltage Vel of the voltage across the organic electroluminescent element OEL ( △β multiplication correction). In this case, the parameter K itself used for the Vel correction is corrected by the Δβ multiplication.

However, in the explanatory diagram of the data conversion processing shown in FIG. 28, the β correction after the influence of the parasitic capacitance in the pixel PIX is not added (the conversion characteristic in the case where the Vel correction is not performed: the characteristic line SD1) is compared. The digital data and the β-corrected digital data when the influence of the parasitic capacitance (the conversion characteristic in the case of Vel correction: characteristic line SD3) is added, the influence of the Vel correction on the β correction is substantially negligible.

Then, the digital data (K × (n _dout × Δβ + n _th )) _subjected to the correction processing is supplied to the data register circuit 142 of the data driver 140 as the luminance measurement video data n _{d — brt} .

The data driver 140 converts the luminance measurement video data n _{d — brt} taken into the data register circuit 142 into an analog signal voltage by the DAC 42 of the DAC/ADC circuit 144.

Here, as shown in FIG. 4 described above, since the output input characteristics (conversion characteristics) of the DAC 42 and the ADC 43 are set to be the same, the gray scale voltage (second voltage) V _brt generated by the DAC 42 is based on The definition shown in the above formula (14) is defined as the following formula (28). This gray scale voltage V _brt is supplied to the pixel PIX via the data line Ld.

V _brt =V ₁ -ΔV(n _{d_brt} -1)) (28)

In this manner, a series of correction processes are performed on the specific image data, and the gray scale voltage V _{brt for} luminance measurement is generated and written into the display panel 110, whereby the light-emitting drive circuit DC from each pixel PIX can flow. The current value of the illuminating drive current Iel flowing through the electroluminescent element OEL is set to a constant value, and is not affected by the variation of the current amplification factor β or the variation of the threshold voltage Vth of the driving transistor, and is not affected by the illuminating driving circuit. The effect of parasitic capacitance when driving DC.

Then, in this state, the display panel 110 is caused to emit light, and the light emission luminance Lv (cd/m ² ) of each pixel PIX is measured. Here, as for the method of measuring the luminance of each pixel PIX, the same method as that described in the first embodiment described above can be applied. Then, as described above, based on the measurement of the luminance of the emitted light, a correction data (fourth characteristic parameter) Δβ _{η for} correcting the deviation between the current amplification factor β and the luminous current efficiency _{η is obtained} .

The correction data n _1h obtained by the characteristic parameter obtaining operation and the Δβ _η and the parameter K obtained based on the measurement of the light-emitting luminance are images input from the outside of the display device 100 of the present embodiment in a display operation to be described later. Data n _d , setting of applied voltage amplitude (data conversion of equation (23)), correction of deviation of current amplification factor β (Δβ multiplication correction), variation of variation of luminous current efficiency η (Δη multiplication correction), threshold _It is used when the corrected image data n _{d_comp} is generated by the variation correction of the value voltage Vth (n _1h addition correction) and the variation correction of the illuminating voltage Vel caused by the parasitic capacitance in the pixel PIX (K multiplication correction).

Therefore, since the gray scale voltage Vdata _{corresponding to} the analog voltage value of the corrected image data n _{d — comp is} supplied from the data driver 140 to the respective pixels PIX via the data line Ld, the organic electroluminescent element OEL of each pixel PIX can be prevented from being subjected to current. In the case of the influence of the variation of the amplification factor β or the luminous current efficiency η, the fluctuation of the threshold voltage Vth of the driving transistor, or the variation of the luminous voltage Vel, the light emission operation is performed at the desired luminance gray scale, and good and uniform illumination can be realized. status.

Next, the above-described characteristic parameter obtaining operation to which the automatic zeroing method is applied will be described in a manner related to the device configuration of the present embodiment.

In the following description, the same operations as those of the above-described characteristic parameter obtaining operation will be simplified or omitted.

First, to obtain the variation of the threshold voltage Vth of the drive transistor of each pixel PIX for correcting the correction data for correcting the current n _th and each pixel PIX of magnification correction data △ β beta] of deviation.

Fig. 29 is a timing chart (1) showing the characteristic parameter obtaining operation of the display device of the embodiment.

Fig. 30 is a view showing the operation of the voltage applying operation for detecting the display device of the embodiment.

Fig. 31 is a view showing the operation of the natural mitigation operation of the display device of the embodiment.

Fig. 32 is a view showing the operation of the data line voltage detecting operation of the display device of the embodiment.

Fig. 33 is a view showing the operation of the detection data sending operation of the display device of the embodiment.

Fig. 34 is a functional block diagram (1) showing a correction data calculation operation of the display device of the embodiment.

Here, in the 30th to 33rd drawings, as the configuration of the data driver 140, the illustration of the shift register circuit 141 is omitted for convenience of illustration.

In the operation of obtaining the characteristic parameters (correction data n _th and Δβ) of the present embodiment, as shown in FIG. 29, each pixel PIX of each column is set to include the detection voltage application in the predetermined characteristic parameter acquisition period Tcpr. The period T ₁₀₁ , the natural relaxation period T ₁₀₂ , the data line voltage detection period T _{103 ,} and the detection data transmission period T ₁₀₄ .

Here, the natural relaxation period T ₁₀₂ corresponds to the above-described relaxation time t, and in FIG. 29, although the relaxation time t is set to one time for convenience of illustration, actually, in the natural relaxation period T ₁₀₂ Each of the different relaxation times t (= t ₀ , t ₁ , t ₂ , t ₃ ), repeatedly performs the data line voltage detection operation (data line voltage detection period T ₁₀₃ ) and the detection data transmission operation (detection data transmission period) T ₁₀₄ ).

First, in the detection voltage application period T ₁₀₁ , as shown in FIGS. 29 and 30 , the pixel PIX (the pixel PIX in the first column in the figure) which is the target of the characteristic parameter acquisition operation is set to the selected state. That is, the selection signal Ssel of the selected level (high level: Vgh) is applied to the selection line Ls to which the pixel PIX is connected from the selection driver 120, while the low level is applied from the power source driver 130 to the power line La (non-light emission level: DVSS = ground potential GND) power supply voltage Vsa.

Then, in this selection state, the switch SW1 provided in the output circuit 145 of the data driver 140 is turned on in accordance with the switching control signal S1 supplied from the controller 150a, thereby connecting the data line Ld(j) and the DAC/ADC144. DAC42(j).

Further, based on the switching control signals S2 and S3 supplied from the controller 150b, the switch SW2 provided in the output circuit 145 is turned off, and the switch SW3 connected to the contact Nb of the switch SW4 is turned off.

Further, according to the switching control signal S4 supplied from the controller 150b, the switch SW4 provided in the material latch circuit 143 is set to be connected to the contact Na, and the switch SW5 is set to and the contact point Na according to the switching control signal S5. connection.

Then, the digital data n _{d for} generating the detection voltage Vdac of a predetermined voltage value is sequentially taken into the data register circuit 142 from the outside of the data driver 140, and then held in the data latch via the switch SW5 corresponding to each row. 41(j).

Then, the digital data n _d held by the data latch 41 (j) is input to the DAC 42 (j) of the DAC/ADC circuit 144 via the switch SW4 for analog conversion, and is applied to the data lines Ld (j) of the respective rows for detection. Voltage Vdac.

Here, in order to generate the detection voltage Vdac, the digital data (image data) n _d is used in the above-described controller 150b, and the specific digital data (image data) for obtaining the parameter input from the outside is used for the voltage amplitude setting function. The circuit 152b, the multiplication function circuit 153b, and the addition function circuit 154b are generated by applying data conversion and correction processing.

In this case, the parameter K set in the data conversion processing of the reference table 151 and the correction processing by the multiplication function circuit 153b and the addition function circuit 154b is set to K = 1.0 by the K parameter setting circuit 158.

Therefore, with respect to the data conversion processing executed by the voltage amplitude setting function circuit 152b with reference to the reference table 151, since the digital data input according to the equation (23) is directly output, the voltage amplitude setting function circuit 152b is substantially set and set. The state of straight through or roundabout is equal.

Further, since the correction data Δβ, n _th used for the correction processing of the multiplication function circuit 153b and the addition function circuit 154b have not yet been acquired, these are set as the start values, or the multiplication function circuit 153b and the addition function circuit 154b are set. Into, for example, a through state.

Thus, digital data output amplitude setting circuit 152b from the function of direct voltage as a detection voltage Vdac is set using digital data n _d is supplied to the data driver 140.

Therefore, the transistors Tr11 and Tr12 provided in the light-emitting drive circuit DC constituting the pixel PIX are turned on, and the low-level power supply voltage Vsa (=GND) is applied to the gate terminal and the capacitor of the transistor Tr13 via the transistor Tr11. One end side of Cs (connection point N11). Moreover, the detection voltage Vdac applied to the data line Ld(j) is applied to the source terminal of the transistor Tr13 and the other end side (connection point N12) of the capacitor Cs via the transistor Tr12.

In this manner, by applying a potential difference larger than the threshold voltage Vth of the transistor Tr13 between the gate and the source terminal of the transistor Tr13 (that is, both ends of the capacitor Cs), the transistor Tr13 is turned on. And the drain current Id corresponding to this potential difference (gate voltage, source-to-source voltage Vgs).

At this time, since the potential of the source terminal of the transistor Tr13 (detection voltage Vdac) is set lower than the potential of the 汲 terminal (ground potential GND), the drain current Id is from the power supply voltage line La via the transistor Tr13. The connection point N12, the transistor Tr12, and the data line Ld(j) flow toward the data driver 140. Further, both ends of the capacitor Cs connected between the gate and the source of the transistor Tr 13 are charged with a voltage corresponding to the potential difference according to the gate current Id.

At this time, the current does not flow to the organic electroluminescent element OEL, and the light-emitting operation is not performed.

Then, the natural relaxation period T ₁₀₂ after the detection voltage application period T ₁₀₁ ends, as shown in FIG. 29 and FIG. 31, is supplied from the controller 150b while the pixel PIX is held in the selected state. The switching control signal S1 causes the switch SW1 of the data driver 140 to be turned off, thereby separating the data line Ld(j) from the data driver 140 and stopping the output of the detection voltage Vdac from the DAC 42(j).

Further, similarly to the above-described detection voltage application period _T101 , the switches SW2 and SW3 are turned off, the switch SW4 is set to be connected to the contact Nb, and the switch SW5 is set to be connected to the contact Nb.

Thereby, since the transistors Tr11 and Tr12 are kept in the on state, the pixel PIX (light-emitting drive circuit DC) is kept in electrical connection with the data line Ld(j), but the voltage is applied to the data line Ld(j) by the cutoff. Therefore, the other end side (connection point N12) of the capacitor Cs is set to a high impedance state.

In the natural relaxation time T _102, by during the application of voltage above the detecting T ₁₀₁ by the charging to the capacitor Cs (transistor Tr13 of the gate, the source between) the voltage, the transistor Tr13 holding a conductive state, while the drain The pole current Id continues to flow. Then, the potential of the source terminal side (connection point N12: the other end side of the capacitor Cs) of the transistor Tr13 gradually rises to approach the threshold voltage Vth of the transistor Tr13. Therefore, the potential of the data line Ld(j) also changes to converge to the threshold voltage Vth of the transistor Tr13.

Further, during this natural relaxation period _T102 , the current does not flow to the organic electroluminescent element OEL, and the light-emitting operation is not performed.

Next, in the data line voltage detection period _T103 , when the natural relaxation period _{T102 has} passed the predetermined relaxation time t, as shown in FIGS. 29 and 32, the pixel PIX is held in the selected state. The switch SW2 of the data driver 140 is turned on in accordance with the switching control signal S2 supplied from the controller 150b. At this time, the switches SW1 and SW3 are turned off, the switch SW4 is set to be connected to the contact Nb, and the switch SW5 is set to be connected to the contact Nb.

Thereby, the data line Ld(j) and the ADC 43(j) of the DAC/ADC 144 are connected, and the data line voltage Vd at the time point when the natural relaxation period T ₁₀₂ passes the predetermined relaxation time t is via the switch SW2 and the buffer 45(j). It is taken into ADC43(j).

Then, the data line detection voltage Vmeas(t) which is taken up by the analog signal voltage of the ADC 43(j) is converted into the detection data composed of the digital data in the ADC 43(j) according to the equation (14). _Meas (t) is held by the data latch 41(j) via the switch SW5.

Next, in the detected data delivery period _T104 , as shown in FIGS. 29 and 33, the pixel PIX is set to the non-selected state.

That is, the selection signal Ssel of the non-selected level (low level: Vgl) is applied to the selection line Ls from the selection driver 120. In this non-selected state, based on the switching control signals S4, S5 supplied from the controller 150b, the switch SW5 provided in the input section of the data latch 41(j) of the data drive 140 is set to be connected to the contact Nc, and is set. The switch SW4 of the output section of the data latch 41 (j) is set to be connected to the contact Nb. Further, the switch SW3 is turned on in accordance with the switching control signal S3. At this time, the switches SW1 and SW2 perform the OFF operation in accordance with the switching control signals S1 and S2.

Thus, the data latches 41(j) of the rows adjacent to each other are connected in series via the switches SW4, SW5, and are connected to the external controller 150b via the switch SW3.

Then, based on the data latch pulse signal LP supplied from the controller 150b, the detection data n _meas (t) held by the data latch 41 (j+1) of each row (refer to FIG. 3) is sequentially transferred to Adjacent data latch 41(j).

Therefore, the detection data n _meas (t) of the pixel PIX of one column is output as the serial data, as shown in FIG. 34, and is stored in the memory 155 provided in the controller 150b in a manner corresponding to each pixel PIX. Established memory area.

In the above-described series of operations, the data line voltage detecting operation and the detected data sending operation are set to different mitigating times t (= t0, t1, t2, and t3) to perform a plurality of times for each pixel PIX. . Here, the operation of detecting the data line voltage at the different relaxation time t is as described above, and may be at a different timing t during the period in which the detection voltage is applied only once and the natural relaxation is continued (the relaxation time t=t0, T1, t2, t3) The data line voltage detection operation and the detection data are sent out for a plurality of times, and the relaxation time t is different, and the detection voltage application, natural relaxation, data line voltage detection, and detection data are sent out in series. The action is executed multiple times.

The characteristic parameter obtaining operation for each of the pixels PIX shown in the above is repeated, and the plurality of pieces of detection data n _meas (t) are stored in the memory 155 of the controller 150b for the all-pixel PIX arranged on the display panel 110.

Then, based on the detection data n _meas (t) of each pixel PIX, a correction data n _th for correcting the threshold voltage Vth of the transistor (driving transistor) Tr13 of each pixel PIX and a correction current amplification factor β are performed. The correction data Δβ is calculated.

Specifically, as shown in FIG. 34, first, the correction data acquisition function circuit 156 provided in the controller 150b reads the detection data n _meas (t) corresponding to each pixel PIX stored in the memory 155.

Then, the correction data acquisition function circuit 156 obtains the correction data n _th according to the above-described equations (15) to (21) in accordance with the characteristic parameter acquisition operation using the automatic zeroing method described above (specifically, the correction is specified). The data n _th is detected by n _meas (t ₀ ) and the bias voltage (-Voffset=-1/ξ×t ₀ ) and the corrected data Δβ. The corrected data n _th and Δβ are calculated to correspond to each pixel PIX. The way is remembered in the established memory area of the memory 155.

Next, using the correction data n _th , Δβ and the parameter K, the correction data Δη for correcting the variation in the luminous current efficiency η of each pixel PIX is obtained.

Fig. 35 is a timing chart (2) showing the characteristic parameter obtaining operation of the display device of the embodiment.

Fig. 36 is a functional block diagram showing the operation of generating luminance image data for the display device of the embodiment.

Fig. 37 is a view showing the operation of the writing operation of the image data for luminance measurement of the display device of the embodiment.

Fig. 38 is a view showing the operation of the light-emitting operation for luminance measurement of the display device of the embodiment.

Fig. 39 is a functional block diagram (part 2) showing the correction data calculation operation of the present embodiment.

Here, in the 37th and 38th drawings, as the configuration of the data driver 140, the illustration of the shift register circuit 141 is omitted for convenience of illustration.

The characteristic parameter (correction data Δη) acquisition operation of the present embodiment is set as shown in Fig. 35, and is set to include image data for luminance measurement that is generated for each pixel PIX of each column and written in the luminance measurement image data. In the period T ₂₀₁ , the light-emitting period T ₂₀₂ for luminance measurement in which the pixels PIX perform light-emission operation in accordance with the luminance gray scale of the image data for luminance measurement, and the light-emitting luminance measurement period T _{203 for} measuring the light-emitting luminance of each pixel. Here, the luminance measurement illumination period T ₂₀₂ includes the emission luminance measurement period T ₂₀₃ , and the measurement of the emission luminance is performed in the luminance measurement illumination period T ₂₀₂ .

In the luminance measurement video data writing period T ₂₀₁ , the operation of generating the luminance measurement video data and the luminance measurement video data are performed in the respective pixels PIX.

The operation of generating the luminance measurement video data is performed by the controller 150b using the correction data Δβ and n _th obtained by the above-described characteristic parameter acquisition operation and the various design data of the display panel 110 or each pixel PIX. The parameter K is used for data conversion and correction for the predetermined brightness measurement digital data n _d , and the brightness measurement image data n _{d_brt is generated} .

Specifically, as shown in FIG. 36, first, by the controller 150b in the voltage amplitude setting circuit 152b functions in referring to the reference table 151, while the first measurement as a digital data n _d of the external input from the luminance ( 23) The data conversion process shown in the equation, and the conversion data n _dout is generated.

Next, the corrected data Δβ corresponding to each pixel stored in the memory 155 is read. Further, the value of the parameter K is set by the K parameter setting circuit 158. Here, the parameter K is set, for example, to K=1.1.

Then, the multiplication function circuit 153b performs multiplication processing (K × n _dout × Δβ) of the correction data Δβ and the parameter K on the digital data (conversion data) n _dout output from the voltage amplitude setting function circuit 152b.

Next, the detection data n _meas (t ₀ ) and the bias voltage (-Voffset=-1/ξ×t ₀ ) of the predetermined correction data n _th stored in the memory 155 are read, and in the multiplication function circuits 157a and 157b. Multiplication processing of the parameter K (K × n _meas (t ₀ ), K × Voffset) is performed.

Next, in the addition function circuit 154b, the digital data (K × n _dout × Δβ) from the multiplication function circuit 153b is subjected to the detection data n _meas (t ₀ ) and the bias voltage (-Voffset) multiplied by the parameter K. Addition processing (K × (n _dout × Δβ + n _th )).

By performing the above correction processing, the luminance measurement video data n _{d — brt is generated} and supplied to the data driver 140.

In addition, the operation of writing the luminance measurement video data to each of the pixels PIX is the same as the above-described detection voltage application operation (detection voltage application period _T101 ), and the pixel PIX to be written is set to the selected state. The luminance measurement gray scale voltage V _brt corresponding to the luminance measurement video data n _d-brt is written via the data line Ld (j).

Specifically, as shown in FIG. 35 and FIG. 37, first, a selection signal Ssel of a selection level (high level: Vgh) is applied to the selection line Ls to which the pixel PIX is connected, and a low level is applied to the power supply line La. The power supply voltage Vsa of the quasi (non-light-emitting level: DVSS = ground potential GND).

In this case, the switch SW1 is turned on, and the switches SW4 and SW5 are set to be connected to the contact Nb, whereby the brightness measurement image data n _{d_brt} supplied from the controller 150b is sequentially taken into the data. The memory circuit 142 is held by the data latch 41(j) corresponding to each row.

The held image data n _{d_brt} is analog-converted by the DAC 42 (j) and applied to the data line Ld (j) of each row as the gray scale voltage V _brt for luminance measurement. Here, the luminance measurement gray scale voltage V _brt is set to a voltage value satisfying the condition of the above formula (28) as described above.

Therefore, in the light-emitting drive circuit DC constituting the pixel PIX, a low-level power supply voltage Vsa (= GND) is applied to the gate terminal of the transistor Tr13 and one end side (connection point N11) of the capacitor Cs, and, again, the transistor Tr13 The source terminal and the other end side of the capacitor Cs (connection point N12) apply the luminance measurement gray scale voltage V _brt .

Therefore, the drain current Id corresponding to the potential difference (gate and source-to-source voltage Vgs) generated between the gate and the source terminal of the transistor Tr13 flows, and the light-emitting voltage corresponding to the potential difference according to the gate current Id ( V brt) charges both ends of the capacitor Cs.

At this time, since a lower voltage is applied to the anode (connection point N12) of the organic electroluminescence element OEL than the cathode (common electrode Ec), the organic electroluminescence element OEL does not flow a current, and does not perform a light-emitting operation.

Next, in the luminance measurement light-emitting period _T202 , as shown in FIG. 35, in a state where the pixels PIX of the respective columns are set to the non-selected state, the respective pixels PIX are simultaneously illuminated.

Specifically, as shown in FIG. 38, a selection signal Ssel of a non-selected level (low level: Vgl) is applied to the selection line Ls connected to the entire pixel PIX of the display panel 110, and the power line La is applied at the same time. High level (light level: ELVDD > GND) supply voltage Vsa.

Therefore, the transistors Tr11 and Tr12 provided in the light-emitting drive circuit DC of each pixel PIX are turned off, and the light-emission voltage charged to the capacitor Cs connected between the gate and the source of the transistor Tr 13 is held.

Therefore, the illuminating voltage charged to the capacitor Cs is utilized ( Vbrt) maintains the gate voltage and the source-to-source voltage Vgs of the transistor Tr13, and the transistor Tr13 conducts the conduction operation to flow the drain current Id, and the potential of the source terminal (connection point N12) of the transistor Tr13 rises.

Then, the potential of the source terminal (connection point N12) of the transistor Tr13 rises to be higher than the voltage ELVSS (=GND) applied to the cathode (common electrode Ec) of the organic electroluminescent element OEL, and is organically induced. The light emitting element OEL applies a forward bias. Therefore, the light-emission drive current Iel flows from the power source line La through the transistor Tr13, the connection point N12, and the organic electroluminescent element OEL in the direction of the common electrode Ec, and the organic electroluminescent element OEL performs a light-emitting operation. The light-emission drive current Iel is a light-emitting voltage of the capacitor Cs that is written in the pixel PIX and held between the gate and the source of the transistor Tr 13 in accordance with the address operation of the luminance measurement image data ( Since the voltage value of V brt is defined, the organic electroluminescent element OEL emits light in response to the luminance gray scale of the luminance measurement image data n _{d — brt} .

Here, the luminance measurement video data n _{d_brt} is used to perform voltage amplitude setting based on the correction data Δβ, n _th and the parameter K acquired or generated corresponding to each pixel in the above-described characteristic parameter acquisition operation. The correction of the deviation of the current amplification factor β, the variation correction of the threshold voltage Vth of the drive transistor, and the variation of the variation of the emission voltage Vel caused by the parasitic capacitance in the pixel PIX.

Therefore, by writing the luminance measurement video data n _{d — brt of the} same luminance gray scale value to each pixel PIX, the current value of the light-emission drive current Iel flowing from the light-emitting drive circuit DC of each pixel PIX to the organic electroluminescence element OEL is obtained. It is set to a substantially constant value without being affected by the variation of the current amplification factor β or the fluctuation of the threshold voltage Vth of the driving transistor or the parasitic capacitance in the pixel PIX.

Next, in the luminance luminance measurement period T ₂₀₃ set in the luminance measurement illumination period T ₂₀₂ , the measurement operation of the luminance of each pixel PIX and the correction data Δη for correcting the luminance current efficiency η of each pixel PIX are performed. Calculate the action.

In the pixel PIX of the display panel 110, the light-emission drive current Iel having substantially the same current value flows through the organic electroluminescent element OEL to emit light, as shown in Figs. 35 and 39. In the state of the operation, the luminance Lv of each pixel PIX is measured as digital data by a luminance meter or a CCD camera 160 provided on the emission surface side of the display panel 110. The measured light emission luminance Lv is transmitted to the correction material acquisition function circuit 156 of the controller 150b.

The correction data Δη is calculated by first calculating the correction data Δβ _η in the correction data acquisition function circuit 156 provided in the controller 150b. The calculated Δβ _η is stored in the predetermined memory area of the memory 155 so as to correspond to each pixel PIX, similarly to the above-described detection data n _meas (t) or the correction data n _th .

(display action)

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

In the light-emitting operation of the display device, the correction data n _th , Δβ _η and the parameter K are used to correct the image data, so that each pixel PIX performs a light-emitting operation at a desired luminance gray scale.

Fig. 40 is a timing chart showing the light-emitting operation of the display device of the embodiment.

Fig. 41 is a functional block diagram showing the operation of correcting the image data of the display device of the embodiment.

Fig. 42 is a view showing the operation of the image data writing operation after the correction of the display device of the embodiment.

Fig. 43 is a view showing the operation of the light-emitting operation of the display device of the embodiment.

Here, in the 42nd and 43rd drawings, as the configuration of the data driver 140, the illustration of the shift register circuit 141 is omitted for convenience of illustration.

As shown in FIG. 40, the display operation of the present embodiment is set to include a video data writing period T _{301 in} which desired image data is generated for each column of pixels PIX, and a luminance gray corresponding to the image data. The pixel light-emitting period T _{302 in} which each pixel PIX performs a light-emitting operation is performed.

In the video data writing period T ₃₀₁ , the operation of correcting the image data generation and the operation of correcting the image data writing to each pixel PIX are performed.

The correction image data generation operation is performed by the controller 150b, and the predetermined image data n _d composed of the digital data is used, and the correction data Δβ, Δη, n _th obtained by the above-mentioned characteristic parameter acquisition operation and the pre-display according to the display are used. The parameter K calculated by various design data of the panel 110 performs data conversion and correction, and supplies the corrected image data (corrected image data) n _{d — comp} to the data driver 140.

Specifically, as shown in FIG. 41, the voltage amplitude setting function circuit 152b supplies the video data (second video data) n _d including the luminance grayscale values of the respective RGB colors supplied from the outside of the controller 150b. By referring to the reference table 151, the data conversion processing shown in the above equation (27) is performed in a manner corresponding to the RGB color components, and the conversion data n _dout is generated.

Next, the corrected data Δβ _η corresponding to each pixel memorized by the memory 155 is read. The value of the parameter K is set by the K parameter setting circuit 158. Here, the parameter K is set, for example, to K=1.1.

Then, the multiplication function circuit 153b multiplies the read correction data Δβ _η and the parameter K by the digital data (conversion data) n _dout output from the voltage amplitude setting function circuit 152b (K × n _dout × Δβ).

Next, the detection data n _meas (t ₀ ) and the bias voltage (-Voffset=-1/(ξ×t ₀ )) of the predetermined correction data nth stored in the memory 155 are read, and in the multiplication function circuits 157a and 157b. Multiplication processing of the parameter K (K × n _meas (t ₀ ), K × Voffset) is performed.

Next, in the addition function circuit 154b, the digital data (K × n _dout × Δβ _η ) from the multiplication function circuit 153b is subjected to the detection data n _meas (t ₀ ) multiplied by the parameter K and the bias voltage (- Addition processing of Voffset) (K × (n _dout × Δβ + n _th )).

The corrected image data n _{d_comp is generated} and supplied to the data driver 140 by performing the above-described series of correction processing.

Further, the writing operation of the corrected image data of each pixel PIX is performed in a state where the pixel PIX to be written is set to the selected state, and the gray corresponding to the corrected image data n _{d_comp} is written via the data line Ld (j). The step voltage Vdata.

Specifically, as shown in FIG. 40 and FIG. 42, first, a selection signal Ssel of a selected level (high level: Vgh) is applied to the selection line Ls to which the pixel PIX is connected, and a low level is applied to the power supply line La. The power supply voltage Vsa of the quasi (non-light-emitting level: DVSS = ground potential GND).

In this state, the switch SW1 is turned on, and the switches SW4 and SW5 are set to be connected to the contact Nb, whereby the corrected image data n _{d_comp} supplied from the controller 150b is sequentially taken into the data register. Circuit 142 is held by data latch 41(j) corresponding to each row.

The held image data n _{d_comp} is analog-converted by the DAC 42 (j) and applied to the data line Ld (j) of each row as the gray scale voltage (third voltage) Vdata.

Here, the gray scale voltage Vdata is defined as the following equation (29) according to the definition shown in the above formula (14).

V _data =V ₁ -ΔV(n _{d_comp} -1)) (29)

Therefore, in the light-emitting drive circuit DC constituting the pixel PIX, a low-level power supply voltage Vsa (= GND) is applied to the gate terminal of the transistor Tr13 and the one end side (connection point N11) of the capacitor Cs.

Further, a gray scale voltage Vdata corresponding to the corrected image data n _{d — comp} is applied to the source terminal of the transistor Tr13 and the other end side (connection point N12) of the capacitor Cs.

Therefore, the drain current Id corresponding to the potential difference (gate and source-to-source voltage Vgs) generated between the gate and the source terminal of the transistor Tr13 flows, and the light-emitting voltage corresponding to the potential difference according to the gate current Id (=Vdata) charges both ends of the capacitor Cs.

At this time, since a lower voltage is applied to the anode (connection point N12) of the organic electroluminescent element OEL than the cathode (common electrode Ec), the current does not flow to the organic electroluminescent element OEL, and the light-emitting operation is not performed.

Next, in the pixel light-emitting period _T302 , as shown in FIG. 40, in a state where the pixels PIX of the respective columns are set to the non-selected state, the respective pixels PIX are simultaneously illuminated.

Specifically, as shown in FIG. 43, a selection signal Ssel of a non-selected level (low level: Vgl) is applied to the selection line Ls connected to the full pixel PIX of the display panel 110, and a high level is applied to the power line La. The power supply voltage Vsa of the quasi (light level: ELVDD > GND).

Therefore, the transistors Tr11 and Tr12 provided in the light-emitting drive circuit DC of each pixel PIX perform the OFF operation, and the voltage charged to the capacitor Cs connected between the gate and the source of the transistor Tr 13 is held (=Vdata: gate Pole and source voltage Vgs).

Therefore, the transistor Tr13 is turned on, the drain current Id flows, and the potential of the source terminal (connection point N12) of the transistor Tr13 rises to be higher than that of the cathode (common electrode Ec) applied to the organic electroluminescent element OEL. When the voltage ELVSS (= GND) is higher, the light-emission drive current Iel flows from the light-emitting drive circuit DC to the organic electroluminescent element OEL.

Since the light-emission drive current Iel is defined based on the voltage value of the voltage (=Vdata) held between the gate and the source of the transistor Tr 13 in the write operation of the corrected image data, the organic electroluminescent element OEL The light-emitting operation is performed in _accordance with the luminance gray scale of the image data n _{d_comp} for luminance measurement.

Further, in the above-described embodiment, as shown in FIGS. 35 and 40, in the operation for displaying the correction data Δη and the display operation, the luminance is measured for the pixel PIX of the specific column (for example, the first column). After the writing operation of the image data or the corrected image data is completed, the pixel PIX of the column is set to the hold state until the writing operation of the image data of the pixel PIX of the other column (the second column or later) is completed.

Here, in the hold state, the selection signal Ssel of the non-selection level is applied to the selection line Ls of the column, and the pixel PIX is set to the non-selection state, and the power supply line La is applied to the power supply voltage Vsa of the non-emission level, It is set to a non-lighting state. This holding state is as shown in Fig. 35 and Fig. 40, and the setting time for each column is different. In addition, after the writing operation of the luminance measurement video data or the corrected image data of the pixels PIX of each column is completed, the driving control for causing the pixel PIX to emit the light is performed immediately, and the holding state may not be set.

In this manner, the display device (the light-emitting device including the pixel driving device) and the driving control method of the light-emitting device of the present embodiment have the unique automatic zero-return method applied to the present invention, and are in different timings (mitigation). Time) Performs a method of taking in the data line voltage and converting it into a series of characteristic parameters composed of digital data to obtain a plurality of actions.

Therefore, according to the present embodiment, it is possible to obtain a parameter for correcting the variation of the threshold voltage of the driving transistor of each pixel and the variation of the current amplification factor of each pixel.

Further, in the present embodiment, in the design stage of the display panel or each pixel, the illuminance caused by the parasitic capacitance added to the driving transistor provided in each pixel is calculated in advance based on the parasitic capacitance added to the driving transistor. The parameter K of the fluctuation of the voltage, and the method of appropriately setting the value of the parameter K in response to the operating state of the display device.

Therefore, according to the present embodiment, it is possible to apply, for the image data written in each pixel, a variation of the threshold voltage for each pixel, a variation of the current amplification factor, and a light-emitting voltage caused by the parasitic capacitance of each pixel. Corrected processing of changes.

Further, in the present embodiment, the correction data for correcting the variation of the threshold voltage and the current amplification ratio between the pixels and the parameter of the variation of the emission voltage of each pixel are set to be uniform. A method in which the light-emitting driving current flows to each pixel and the luminance of each pixel is measured. Therefore, according to the present embodiment, it is possible to obtain a parameter for correcting the variation in the luminous current efficiency between the pixels.

Therefore, according to the present embodiment, when image data is written, fluctuations in the threshold voltage of each pixel, current amplification ratio between pixels, and light emission can be applied to the image data written in each pixel. The variation in current efficiency and the correction processing of the fluctuation of the light-emitting voltage of each pixel. Therefore, according to the present embodiment, the light-emitting element (organic electroluminescence element) can be made to emit light in accordance with the original luminance gray scale of the image data, regardless of the state change of each pixel or the state of variation in characteristics. Active organic electroluminescence driving system with good luminescent properties and uniform image quality.

Further, in the present embodiment, the processing for calculating the correction data for correcting the variation of the current amplification factor including the luminous current efficiency can be performed in a sequence of one of the controllers 150b including the single correction data acquisition function circuit 156, and The processing for compensating the correction data for compensating for the variation of the threshold voltage of the driving transistor is calculated.

Therefore, according to the present embodiment, it is not necessary to provide an individual configuration (function circuit) in accordance with the content of the calculation processing of the correction data, and a reference table is provided, which can be applied based on the conversion table (γ table) corresponding to each color. Since the correction processing for compensating for variations in the light-emission voltage of each pixel is used, the configuration of the display device (light-emitting device) can be simplified.

(Third embodiment)

Next, a third embodiment in which the display devices according to the first and second embodiments described above are applied to an electronic device will be described with reference to the drawings.

As described in the first and second embodiments, the display device 100 including the display panel 110 having the light-emitting elements including the organic electroluminescence element OEL in each pixel PIX can be applied to a digital camera or a mobile individual. Various electronic devices such as computers and mobile phones.

44A and 44B are perspective views showing a configuration example of a digital camera to which the display device (light-emitting device) of the first embodiment is applied.

Fig. 45 is a perspective view showing a configuration example of a mobile personal computer to which the display device (light-emitting device) of the first embodiment is applied.

Fig. 46 is a perspective view showing a configuration example of a mobile phone to which the display device (light-emitting device) of the first embodiment is applied.

In FIGS. 44A and 44B, the digital camera 200 includes a main body 201, a lens unit 202, an operation unit 203, and a display unit 204 and a shutter button 205 including a display device 100 including the display panel 110 of the present embodiment. In this case, in the display unit 204, the light-emitting elements of the respective pixels of the display panel 110 perform light-emission operation in accordance with an appropriate luminance gray scale corresponding to the image data, thereby achieving a good and uniform image quality.

Further, in FIG. 45, the personal computer 210 includes a main body unit 211, a keyboard 212, and a display unit 213 including a display device 100 including the display panel 110 of the present embodiment. In this case, in the display unit 213, the light-emitting elements of the respective pixels of the display panel 110 perform light-emission operation in accordance with an appropriate luminance gray scale corresponding to the image data, thereby achieving a good and uniform image quality.

Further, in Fig. 46, the mobile phone 220 includes an operation unit 221, a listening port 222, a mouthpiece 223, and a display unit 224 including a display device 100 including the display panel 110 of the present embodiment. In this case, in the display unit 224, the light-emitting elements of the respective pixels of the display panel 110 perform light-emission operation in accordance with an appropriate luminance gray scale corresponding to the image data, thereby achieving a good and uniform image quality.

In the embodiment, the present invention is applied to a display device (light-emitting device) 100 including a display panel 110 having a light-emitting element composed of an organic electroluminescence device OEL in each pixel PIX. The invention is not limited to this. The present invention is also applicable to, for example, a light-emitting element array including a plurality of pixels having a light-emitting element composed of an organic electroluminescence element OEL arranged in one direction, and irradiating light emitted from the light-emitting element array in response to image data to the photoreceptor. Drum-exposed exposure device. In this case, the light-emitting elements of the respective pixels of the light-emitting element array can be made to emit light in response to appropriate brightness of the image data, and a good exposure state can be obtained.

Other advantages and modifications will readily occur to those skilled in the art, and the scope of the present invention is not limited to the specific details and representative embodiments shown herein. Accordingly, various modifications may be made without departing from the spirit and scope of the general inventive concept as defined by the appended claims.

100. . . Display device

110. . . Display panel

120. . . Select drive

130. . . Power driver

140. . . Data driver

140A, 140B. . . Internal circuit

141. . . Shift register circuit

142. . . Data register circuit

143. . . Data latch circuit

144. . . DAC/ADC circuit

145. . . Output circuit

146. . . Logic power supply

147. . . Analog power supply

150, 150a, 150b. . . Controller

151. . . Reference table (LUT)

152a. . . Voltage amplitude setting function circuit

153a. . . Multiplication function circuit (image data correction circuit)

154a. . . Addition function circuit (image data correction circuit)

155. . . Memory (memory circuit)

156. . . Corrected data acquisition function circuit (characteristic parameter acquisition circuit)

41(j). . . Data latch

42(j). . . DAC (digital-to-analog conversion circuit)

43(j). . . ADC (analog-digital conversion circuit)

44(j), 45(j). . . buffer

Ld. . . Data line

La. . . power cable

Ls. . . Selection line

SW1, SW2, SW3, SW4, SW5. . . switch

S1, S2, S3, S4, S5. . . Switching control signal

PIX. . . Pixel

Fig. 1 is a schematic configuration diagram showing an example of a display device to which a light-emitting device of the present invention is applied.

Fig. 2 is a schematic block diagram showing an example of a data driver applied to the display device of the first embodiment.

Fig. 3 is a schematic circuit configuration diagram showing an example of a configuration of a main part of a data driver applied to the display device of the first embodiment.

Fig. 4 is a view showing an output input characteristic of a digital-analog conversion circuit and an analog-digital conversion circuit applied to the data driver of the first embodiment.

Fig. 5 is a functional block diagram showing the function of a controller applied to the display device of the first embodiment.

Fig. 6 is a circuit configuration diagram showing an embodiment of a pixel applied to the display panel of the first embodiment.

Fig. 7 is a view showing an operational state when a pixel of the light-emitting drive circuit of the first embodiment is applied to write image data.

Fig. 8 is a view showing a voltage-current characteristic of a pixel to which the light-emitting drive circuit of the first embodiment is applied during a write operation.

Fig. 9 is a diagram showing changes in the data line voltage of the technique (automatic zeroing method) applied to the characteristic parameter obtaining operation of the first embodiment.

Fig. 10 is a timing chart (1) showing the characteristic parameter obtaining operation of the display device of the first embodiment.

Fig. 11 is a view showing the operation of the detection voltage application operation of the display device of the first embodiment.

Fig. 12 is a view showing the operation of the natural mitigation operation of the display device of the first embodiment.

Fig. 13 is a view showing the operation of the data line voltage detecting operation of the display device of the first embodiment.

Fig. 14 is a view showing the operation of the detection data sending operation of the display device of the first embodiment.

Fig. 15 is a functional block diagram showing a correction data calculation operation of the display device of the first embodiment.

Fig. 16 is a timing chart (2) showing the characteristic parameter obtaining operation of the display device of the first embodiment.

Fig. 17 is a functional block diagram showing an operation of generating image data for luminance measurement of the display device of the first embodiment.

Fig. 18 is a view showing the operation of the writing operation of the image data for luminance measurement of the display device of the first embodiment.

Fig. 19 is a view showing the operation of the light-emitting operation for luminance measurement of the display device of the first embodiment.

Fig. 20 is a functional block diagram (part 2) showing the correction data calculation operation of the first embodiment.

Fig. 21 is a timing chart showing the light-emitting operation of the display device of the first embodiment.

Fig. 22 is a functional block diagram showing the operation of correcting image data of the display device of the first embodiment.

Fig. 23 is a view showing the operation of the image data writing operation after the correction of the display device of the first embodiment.

Fig. 24 is a view showing the operation of the light-emitting operation of the display device of the first embodiment.

Fig. 25 is a functional block diagram showing the function of a controller applied to the display device of the second embodiment.

Fig. 26 is a view showing an operational state of the organic electroluminescence element to which the pixel of the light-emitting drive circuit of the second embodiment is applied.

Fig. 27 is a characteristic diagram showing the relationship between the light-emission voltage and the light-emission drive current of the organic electroluminescence element in the light-emitting operation of the pixel of the second embodiment.

Fig. 28 is a view for explaining data conversion processing of a reference table applied to the controller of the second embodiment.

Fig. 29 is a timing chart (1) showing the characteristic parameter obtaining operation of the display device of the second embodiment.

Fig. 30 is a view showing the operation of the detection voltage application operation of the display device of the second embodiment.

Fig. 31 is a view showing the operation of the natural mitigation operation of the display device of the second embodiment.

Fig. 32 is a view showing the operation of the data line voltage detecting operation of the display device of the second embodiment.

Fig. 33 is a view showing the operation of the detection data sending operation of the display device of the second embodiment.

Fig. 34 is a functional block diagram (1) showing a correction data calculation operation of the display device of the second embodiment.

Fig. 35 is a timing chart (2) showing the characteristic parameter obtaining operation of the display device of the second embodiment.

Fig. 36 is a functional block diagram showing the operation of generating image data for luminance measurement of the display device of the second embodiment.

Fig. 37 is a view showing the operation of the writing operation of the image data for luminance measurement of the display device of the second embodiment.

Fig. 38 is a view showing the operation of the light-emitting operation for luminance measurement of the display device of the second embodiment.

Fig. 39 is a functional block diagram (part 2) showing the correction data calculation operation of the second embodiment.

Fig. 40 is a timing chart showing the light-emitting operation of the display device of the second embodiment.

Fig. 41 is a functional block diagram showing the operation of correcting the image data of the display device of the second embodiment.

Fig. 42 is a view showing the operation of the image data writing operation after the correction of the display device of the second embodiment.

Fig. 43 is a view showing the operation of the light-emitting operation of the display device of the second embodiment.

44A and 44B are perspective views showing the configuration of the digital camera of the third embodiment.

Fig. 45 is a perspective view showing the configuration of a mobile personal computer according to the third embodiment.

Fig. 46 is a view showing the configuration of a mobile phone according to the third embodiment.

110. . . Display panel

140. . . Data driver

150a. . . Controller

151. . . Reference table

152a. . . Voltage amplitude setting function circuit

153a. . . Multiplication function circuit

154a. . . Addition function circuit

155. . . Memory

156. . . Corrected data acquisition function circuit

160. . . Luminance meter / CCD camera

Claims (19)

A pixel driving device that drives a pixel, wherein the pixel has a light emitting element and a light emitting driving circuit, wherein the light emitting driving circuit has a driving control element that connects a current path to the light emitting element; and the pixel driving device includes a characteristic parameter obtaining circuit that obtains An electrical characteristic parameter for compensating for variations in electrical characteristics of the light-emitting drive circuit, and an illumination characteristic parameter for compensating for variations in characteristics of the light-emitting element; the characteristic parameter acquisition circuit applies a data line connected to the pixel Detecting a voltage, and applying a voltage exceeding a voltage value of the threshold voltage of the drive control element between the control terminal of the drive control element and one end of the current path, and acquiring the data line after at least one easing time Detecting a voltage, and obtaining, according to a voltage value of the detection voltage, a first characteristic parameter corresponding to a fluctuation of a threshold voltage of the driving control element of the light-emitting driving circuit, and a current amplification factor of the light-emitting driving circuit with respect to a set value The second characteristic parameter corresponding to the deviation is used as the electrical characteristic parameter; the characteristic parameter Circuit lines have characteristic parameter obtaining the emission luminance value of the pixels in accordance with light emission of the light emitting element, and the light emitting element of the pixel lines in response to the corrected based on the measured electrical characteristic parameter luminance image data with the light emitting operation is performed. The pixel driving device of claim 1, wherein the voltage driving circuit further generates a shadow corresponding to the supplied image. And connecting the switching circuit to connect or disconnect the voltage applying circuit and the data line; the characteristic parameter obtaining circuit connects the voltage applying circuit and the data line by using the connection switching circuit After the voltage application circuit outputs a predetermined gray scale voltage as the detection voltage, the connection switching circuit disconnects the data line from the voltage application circuit, and the data line is set to a high impedance state. A plurality of voltages of the data line at the time point when the relaxation time has elapsed are used as the detection voltage. The pixel driving device of claim 2, further comprising an image data correction circuit for correcting the supplied image data; the image data correction circuit is supplied with the brightness measurement image data as the image data, and Correction processing is performed on the luminance measurement video data, and the second characteristic parameter is subjected to multiplication processing to add the first characteristic parameter, and the voltage application circuit supplies the luminance to which the correction processing has been performed. The measurement image data is generated and outputted for the luminance measurement gray scale voltage corresponding to the luminance measurement image data, and the characteristic parameter acquisition circuit obtains the luminance measurement gray scale voltage applied to the data line to perform the light emission operation. This value of the light-emitting luminance of the light-emitting element acquires a third characteristic parameter relating to the luminous current efficiency of the light-emitting element as the light-emitting characteristic parameter based on the deviation of the obtained value of the light-emitting luminance from the set value of the light-emitting luminance. The pixel driving device of claim 3, wherein the acquisition of the second characteristic parameter and the acquisition of the third characteristic parameter in the characteristic parameter obtaining circuit are performed by the same arithmetic processing circuit. The pixel driving device of claim 3, wherein the characteristic parameter obtaining circuit acquires a fourth characteristic parameter associated with the second characteristic parameter and the third characteristic parameter. The pixel driving device of claim 5, wherein the characteristic parameter obtaining circuit acquires the first to fourth characteristic parameters so as to correspond to respective pixels of the plurality of pixels; further comprising a memory circuit corresponding to the The first to fourth characteristic parameters are stored in a manner of pixels of a plurality of pixels. The pixel driving device of claim 1, wherein the light-emitting driving circuit in the pixel has a capacitive element disposed between the control terminal of the driving control element and one end of the current path; and has an inherent parameter setting circuit It sets a parameter inherent to the pixel based on the capacitance value of the parasitic capacitance, which is a parasitic capacitance added to the drive control element except the capacitive element. The pixel driving device of claim 7, further comprising an image data correction circuit for correcting the supplied image data; the image data correction circuit is supplied with the brightness measurement image data as the image data, and Performing the brightness measurement image data based on the first characteristic parameter, the second characteristic parameter, and the unique parameter The voltage application circuit is supplied with the luminance measurement image data subjected to the correction processing, and generates and outputs a luminance measurement gray scale voltage corresponding to the luminance measurement image data; the characteristic parameter acquisition circuit Obtaining the obtained value of the light-emitting luminance of the light-emitting element in which the gray-scale voltage for luminance measurement is applied to the data line and performing the light-emitting operation, and further determining the deviation of the obtained value of the light-emitting luminance from the set value of the light-emitting luminance. A third characteristic parameter related to the luminous current efficiency of the light-emitting element is obtained as the light-emitting characteristic parameter. A light-emitting device comprising: a light-emitting panel having a plurality of data lines arranged along a first direction; at least one scanning line disposed along a second direction intersecting the first direction; and the plurality of scanning lines Each of the data lines of the data line is connected to the scan line, and is disposed at a plurality of pixels near the intersection of the data lines and the scan line; and a driving circuit for driving the light-emitting panel; each pixel has a light-emitting element and a light-emitting element a driving circuit having a driving control element having one end of the current path connected to the light emitting element; the driving circuit comprising: a scan driving circuit for applying a selection signal to the scan line and connecting the scan line Each pixel is set to a selected state; and a characteristic parameter obtaining circuit is obtained by the scan line driving circuit Setting an electrical characteristic parameter and an illuminating characteristic parameter of each pixel of the selected state, wherein the electrical characteristic parameter is used to compensate for a variation of an electrical characteristic of the illuminating driving circuit, wherein the illuminating characteristic parameter is used to compensate characteristics of the illuminating element The characteristic parameter obtaining circuit applies a detection voltage to each of the data lines connected to the pixel, and applies a drive control between the control terminal of the drive control element and one end of the current path of each pixel. The voltage of the voltage value of the threshold voltage of the component obtains the detection voltage of the data line after at least one relaxation time, and then obtains the electrical characteristic parameter according to the voltage value of the detection voltage; the characteristic parameter acquisition circuit is based on the respective The light-emitting luminance value of the light-emitting element of the pixel acquires the light-emitting characteristic parameter, and the light-emitting element of each pixel performs a light-emitting operation based on the image data for luminance measurement corrected based on the electrical characteristic parameter. The light-emitting device of claim 9, wherein the light-emitting drive circuit of each pixel includes: a first transistor, wherein a first end of the current path is connected to the light-emitting element, and the second end of the current path is applied a predetermined power supply voltage; the second transistor is connected to the scan line by a control terminal, and the first end of the current path is connected to a control terminal of the current path of the first transistor, and the second end of the current path is 1 is connected to the second end of the current path of the transistor; and the third transistor is connected to the scan line by the control terminal, and the current path The first end of the current path is connected to the data line, and the second end of the current path is connected to the first end of the current path of the first transistor; the drive control element is the first transistor; In the selected state, the second transistor and the third transistor are in an on state, and the second end of the current path of the first transistor is connected to the control terminal via the second transistor, and the current of the first transistor a connection point between the first end of the road and the light-emitting element is connected to each of the data lines via the third transistor; and the characteristic parameter acquisition circuit obtains the connection point after the lapse of the lapse of the third transistor and the The voltage of each data line is used as the detection voltage. The illuminating device of claim 9, wherein the characteristic parameter obtaining circuit obtains a first characteristic parameter corresponding to a threshold voltage of the driving control element of the illuminating driving circuit, and a current amplification with the illuminating driving circuit The second characteristic parameter corresponding to the deviation of the set value from the set value is used as the electrical characteristic parameter. The illuminating device of claim 11, further comprising: a voltage applying circuit that generates and outputs a gray scale voltage corresponding to the supplied image data; and a connection switching circuit that connects the voltage applying circuit and the data line Connected or disconnected; the characteristic parameter acquisition circuit connects the voltage application circuit and the data line by using the connection switching circuit, and after the voltage application circuit outputs a predetermined gray scale voltage as the detection voltage, the connection switching circuit is Disconnecting the data line from the voltage application circuit, and setting the data line to a high impedance state, obtaining a plurality of voltages of the data line at a plurality of different time points at which the mitigation time has elapsed Detect voltage. The illuminating device of claim 12, further comprising an image data correction circuit for correcting the supplied image data; the image data correction circuit is supplied with the brightness measurement image data as the image data, and The brightness measurement image data is subjected to a correction process for multiplying the second characteristic parameter and adding the first characteristic parameter, and the voltage application circuit supplies the brightness measurement to which the correction process has been performed. And generating, by the image data, a grayscale voltage for luminance measurement corresponding to the luminance measurement video data, wherein the characteristic parameter acquisition circuit obtains the illumination by which the grayscale voltage for luminance measurement is applied to the data line to perform a light-emitting operation The value of the light-emitting luminance of the element is obtained as a third-characteristic parameter relating to the luminous current efficiency of the light-emitting element based on the deviation of the obtained value of the light-emitting luminance with respect to the set value of the light-emitting luminance. The light-emitting device of claim 13, wherein the characteristic parameter acquisition circuit acquires a fourth characteristic parameter that relates the second characteristic parameter to the third characteristic parameter. For example, in the illuminating device of claim 11, wherein The light-emitting drive circuit in each of the pixels has a capacitance element disposed between the control terminal of the drive control element and one end of the current path, and further has a unique parameter setting circuit that sets each of the capacitance values based on the parasitic capacitance A parameter inherent to the pixel, the parasitic capacitance being a parasitic capacitance of the drive control element added to the pixel other than the capacitive element. The illuminating device of claim 15, wherein the image data correcting circuit further corrects the supplied image data; the image data correcting circuit is supplied with the brightness measuring image data as the image data, and according to The first characteristic parameter, the second characteristic parameter, and the unique parameter are subjected to a correction process for the brightness measurement image data, and the voltage application circuit supplies the brightness measurement image data subjected to the correction process to correspond to The luminance measurement image data is generated and outputted for the luminance measurement gray scale voltage, and the characteristic parameter acquisition circuit is supplied with the luminance of the light-emitting element to which the luminance measurement gray scale voltage is applied to the data line to perform the light-emitting operation. The measured value is obtained as a third characteristic parameter relating to the luminous current efficiency of the light-emitting element based on the deviation of the measured value from the set value of the light-emitting luminance. A driving control method for a light-emitting device, the light-emitting device having a light-emitting panel, wherein the light-emitting panel includes a plurality of data lines and a plurality of pixels connected to the data lines, the pixels having a light-emitting element and a light-emitting driving circuit, the light-emitting driving The circuit has a drive control element connected to the light-emitting element at one end of the current path; the drive control method of the light-emitting device has a voltage application step of applying a detection voltage to each data line and controlling the drive for each pixel a detection voltage exceeding a threshold voltage of the drive control element is applied to the control terminal of the element and one end of the current path; and the voltage acquisition step is performed by applying the detection voltage and acquiring the data lines after at least one easing time The voltage is a plurality of detection voltages; and the electrical characteristic parameter obtaining step is to obtain an electrical property for compensating for variations in electrical characteristics of the light-emitting drive circuit of each pixel based on the obtained voltage values of the plurality of detection voltages. Characteristic parameter; the illuminating action step is to correct the brightness measurement according to the electrical characteristic parameter And illuminating the light-emitting element of each pixel in response to the corrected image data for brightness measurement; and obtaining the light-emitting element of the pixel for performing the light-emitting operation Based on the obtained value of the luminance, the luminance characteristic parameter for compensating for the characteristic variation of the light-emitting element is obtained. The driving control method of the illuminating device of claim 17, wherein the electrical characteristic parameter obtaining step comprises: a first characteristic parameter obtaining step of obtaining a threshold voltage of the driving control element of the illuminating driving circuit Corresponding first characteristic parameter is used as the electrical characteristic parameter; and second characteristic parameter obtaining step is to obtain a second characteristic parameter corresponding to a deviation of a current amplification factor of the light-emitting drive circuit from a set value; and the light-emitting characteristic parameter is obtained The step includes a third characteristic parameter obtaining step of obtaining a third characteristic parameter related to the luminous current efficiency of the light emitting element as the light emission characteristic parameter based on a deviation of the measured value from a set value of the light emitting luminance of the light emitting element. The driving control method of the illuminating device of claim 18, wherein the illuminating driving circuit of each of the pixels has a capacitive element disposed between a control terminal of the driving control element and one end of the current path; The operation step includes a correction step of setting parameters specific to the respective pixels based on the capacitance value of the parasitic capacitance, and correcting the brightness measurement image data according to the inherent parameter, the parasitic capacitance being added to each of the parameters A parasitic capacitance of the driving control element of the pixel other than the capacitive element.