JP5572980B2 - Display device - Google Patents

Description

The present invention relates to a display equipment.

  An organic electroluminescence element (organic EL element) is formed of a fluorescent organic compound that emits light when an electric current is applied, and an organic light emitting diode (hereinafter referred to as OLED) using the organic light emitting diode. A display device provided with a display panel having an element in each pixel has attracted attention as a next-generation display device (see, for example, Patent Document 1).

  In such a display device, a display panel is formed by arranging the OLED elements in a matrix so as to correspond to one pixel, and based on the image data, the OLED element of each pixel is caused to emit light, thereby causing the display panel to emit light. An image is displayed.

  This OLED element is a current driving element that emits light with a luminance corresponding to the current value of the supplied current. In a display panel to which an active matrix driving method is applied, one OLED element and one OLED element are provided for each pixel. And a pixel driving circuit having a plurality of transistors including a driving transistor for connecting a driving current having a current value corresponding to display data to the OLED element.

  The display device further includes a data driver that writes an output signal including a current signal or a voltage signal corresponding to the gradation of the image data to each pixel. When the number of pixels is large, the display device includes a plurality of data drivers.

Japanese Patent Laying-Open No. 2005-115144 (5th page, FIG. 1)

  However, in a conventional display device having a plurality of data drivers, there is a difference in the value of the output signal with respect to the gradation value of the image data due to the difference in characteristics of circuit elements constituting the data driver between the data drivers. Yes, even if the gradation values of the image data are the same, there may be a difference in the value of the output signal output from each data driver.

  Thus, if the characteristics of each data driver are different and there is a difference in the value of the output signal output from each data driver, a luminance difference will occur at the boundary of the area connected to each data driver in the display area of the display panel. As a result, streaky irregularities occur and display quality deteriorates.

  In this case, for example, by manually adjusting the value of the output signal between the data drivers for each display device, it is possible to suppress the occurrence of unevenness, but this takes a lot of labor and time. The cost increased.

The present invention has been made in view of such conventional problems, the display device having a plurality of data drivers, the display equipment capable of improving the visibility display quality without causing an increase in cost The purpose is to provide.

In order to achieve this object, a display device according to the first aspect of the present invention provides:
A plurality of pixels each having a display light emitting element formed in a display region provided on the substrate; a plurality of data lines connected to each pixel; and the plurality of data lines provided adjacent to each other on the substrate, A plurality of data drivers connected to the data line, an output measurement unit formed in a circuit formation region provided on the substrate, and a control unit,
Each of the data drivers outputs an output signal with respect to an input signal, and at least a part has a plurality of output terminals connected to the data lines,
The output measurement unit includes a measurement light emitting element that emits light when supplied with the output signal output from one specific output terminal of the plurality of output terminals of each data driver, and the measurement light emitting element emits light. the amount of light measured with a light receiving element for detecting the amount by receiving the emitted light, the emitted light amount of the measuring light-emitting devices which are detected by the light receiving element, as an output value corresponding to the value of the output signal when possess and measurement unit, the,
The control unit acquires a correction value for correcting the value of the output signal of each data driver based on the correlation of the output values corresponding to each of the plurality of data drivers measured by the output measurement unit,
The plurality of data drivers include a first data driver and a second data driver adjacent to each other,
The plurality of data lines include a first data line and a second data line adjacent to each other, and the first data line is connected to a first output terminal of the first data driver; A second data line is connected to a second output terminal of the second data driver;
An interval between the first output terminal and the second output terminal is larger than an interval between the first data line and the second data line in the display area,
The first data line and the second data line are between the display area, the first data driver, and the second data driver, and the first data line and the second data line. Is bent so as to be larger than the interval between the first data line and the second data line in the display area,
The circuit forming region is provided in a gap formed between the bent first data line and the second data line.

Wherein said measuring light-emitting devices in the display light-emitting element and the output measuring unit in each pixel may be formed on the same on the substrate.

A first data driver and a second data driver in the plurality of data drivers connected to each of the two adjacent data lines of the plurality of data lines;
The output measurement unit is provided corresponding to the first and second data drivers, and the measurement light emitting element and the light amount measurement unit correspond to the first and second data drivers, respectively. Two sets may be provided as shown.

A first data driver and a second data driver in the plurality of data drivers connected to each of the two adjacent data lines of the plurality of data lines;
The output measurement unit is provided corresponding to the first and second data drivers, and the measurement light emission unit corresponding to each of the single light amount measurement unit and the first and second data drivers. An element,
The light receiving element of the light quantity measuring unit may be configured to receive light emitted from the two light emitting elements for measurement.

  A first changeover switch provided corresponding to each of the first and second data drivers, wherein the first changeover switch includes the one changeover switch of each of the first and second data drivers; The output terminal may be switched so as to be connected to either the measurement light emitting element or the data line.

  Each data driver includes a measurement output terminal for outputting a measurement output signal as the specific output terminal, and the measurement output terminal of each data driver may be connected to each of the measurement light emitting elements. Good.

A first data driver and a second data driver in the plurality of data drivers connected to each of the two adjacent data lines of the plurality of data lines;
Each of the data drivers includes a measurement output terminal that outputs a measurement output signal as the specific output terminal,
The output measuring unit is provided corresponding to the first and second data drivers, and includes a single light emitting element for measurement and a single light amount measuring unit.
A second changeover switch provided corresponding to each of the first and second data drivers, wherein the second changeover switch connects the light emitting element for measurement to the first and second data drivers; You may make it switch so that it may connect to either one of each said output terminal for a measurement.

The controller is
The ratio of the output value corresponding to each data driver measured by the output measurement unit to the reference output value, with any one of the output values corresponding to each of the plurality of data drivers as a reference output value The correction value may be acquired based on the above.

  According to the present invention, in a display device including a plurality of data drivers, display quality can be improved without causing an increase in cost.

It is a block diagram which shows the structure of the display apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of a structure of each pixel circuit shown in FIG. It is sectional drawing of the pixel circuit shown in FIG. It is a figure which shows the structure of the photoelectric conversion part in 1st Embodiment, and a sensor signal processing part. It is a figure which shows the structure of the photoelectric conversion part shown in FIG. It is a timing chart when measuring the output value corresponding to two data drivers. FIG. 3 is a diagram showing an outline of a mounting arrangement of a select driver, an anode driver, a data driver, and a photoelectric conversion unit for a TFT panel in the first embodiment. It is a block diagram which shows the structure of the display apparatus concerning 2nd Embodiment. It is a figure which shows the structure of the photoelectric conversion part in 2nd Embodiment, and a sensor signal processing part. It is a block diagram which shows the structure of the display apparatus concerning 3rd Embodiment. It is a figure which shows the structure of the photoelectric conversion part in 3rd Embodiment, and a sensor signal processing part.

Hereinafter, a display device according to an embodiment of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 shows the configuration of the display device according to the first embodiment of the present invention.
The display device 1 according to this embodiment includes a TFT panel (pixel array) 11, a photoelectric conversion unit 12, a select driver 13, a cathode power source 14, an anode driver 15, and data drivers 16 (1) and 16 (2 ), A sensor signal processing unit 17, a power source 18, a controller 19, and a display signal generation circuit 20.

  The TFT panel 11 includes a plurality of pixel circuits 11 (i, j) (i = 1 to m, j = 1 to n, m, n; natural numbers).

  Each pixel circuit 11 (i, j) corresponds to one pixel of the image, and is arranged in a matrix near each intersection of each data line Ld (i) and each select line Ls (j). As shown in FIG. 2, each pixel circuit 11 (i, j) includes, for example, an OLED 111, transistors T1 to T3, and a capacitor C1. Here, the transistors T1 to T3 and the capacitor C1 form a pixel drive circuit DC.

  3A and 3B are a cross-sectional view and a plan view of the OLED 111 and the transistor T3, respectively. As shown in FIGS. 3A and 3B, the OLED 111 emits light for displaying an image. It is an element, and is composed of a pixel electrode (anode electrode) 111a, a light emitting layer 111e, and a cathode electrode 111c.

  The pixel electrode 111a and the light emitting layer 111e are formed on the gate insulating film 121 covering the gate electrode 103g of the transistor T3. The display device 1 of the present embodiment is of a bottom emission type, and a light-transmitting conductive material such as ITO (Indiumu Tin Oxide) or ZnO is used for the pixel electrode 111a. The light of the light emitting layer 111e passes through the pixel electrode 111a and the glass substrate 101 and is irradiated downward as indicated by arrows in the drawing.

  The transistors T1 to T3 shown in FIG. 2 are TFTs (Thin Film Transistors) configured by n-channel FETs (Field Effect Transistors), and are configured by, for example, amorphous silicon or polysilicon TFTs. .

  The transistor T3 is a drive transistor that supplies current to the OLED 111 while controlling the current value. The drain as the current upstream end of the transistor T3 is connected to the anode line La (j), and the source as the current downstream end is connected to the anode of the OLED 111. The transistor T3 supplies a current having a current value corresponding to the gate voltage Vgs as the control voltage to the OLED 111.

  As shown in FIG. 3, the transistor T3 includes a gate electrode 103g, a drain electrode 103d, a source electrode 103s, a semiconductor layer 103c, a protective insulating film 103i, and an ohmic contact layer 103o.

  The gate electrode 103g is formed on the glass substrate 101 and is covered with the gate insulating film 121. The gate electrode 103g is formed of, for example, aluminum-neodymium-titanium (AlNdTi) or chromium (Cr).

  The drain electrode 103d and the source electrode 103s are each formed of, for example, aluminum-titanium (AlTi) / Cr, AlNdTi / Cr, or Cr.

  The semiconductor layer 103c is formed over the gate insulating film 121 and directly above the gate electrode 103g. For example, amorphous silicon is used for the semiconductor layer 103c.

  The protective insulating film 103i functions as an etching stopper when forming the drain electrode 103d and the source electrode 103s, and is formed over the semiconductor layer 103c.

  The ohmic contact layer 103o is provided to insulate the drain electrode 103d and the source electrode 103s from each other because the drain electrode 103d, the source electrode 103s, and the semiconductor layer 103c have low resistance. It is formed of amorphous silicon containing type impurities.

  Next, the transistor T1 shown in FIG. 2 is a switch transistor for connecting or blocking between the gate and the drain of the transistor T3.

  The drain (terminal) of the transistor T1 of each pixel circuit 11 (i, j) is connected to the anode line La (j) (drain of the transistor T3), and the source is connected to the gate as a control terminal of the transistor T3. .

  The gate (terminal) of the transistor T1 of each pixel circuit 11 (1,1) to 11 (m, 1) is connected to the select line Ls (1). Similarly, the gate of the transistor T1 of each pixel circuit 11 (1,2) to 11 (m, 2) is connected to the select line Ls (2),..., And each pixel circuit 11 (1, n) to 11 (11). The gates of the transistors T1 of m, n) are connected to the select line Ls (n), respectively.

  In the case of the pixel circuit 11 (1, 1), when a Hi (High) level signal is output from the select driver 13 to the select line Ls (1), the transistor T1 is turned on. Thereby, since the drain and the gate of the transistor T3 are connected, the transistor T3 is in a diode connection state.

  When a Lo (Low) level signal is output to the select line Ls (1), the transistor T1 is turned off and the transistor T3 is also turned off. At the same time, when the transistor T1 is turned off, the charge charged in the capacitor C1 is held.

  The transistor T2 is a switch transistor that is selected by the select driver 13 to be turned on and off, and that conducts and cuts off between the anode driver 15 and the data drivers 16 (1) and 16 (2).

  The drain of the transistor T2 of each pixel circuit 11 (i, j) is connected to the anode (electrode) of the OLED 111.

  The gates of the transistors T2 of the pixel circuits 11 (1,1) to 11 (m, 1) are connected to the select line Ls (1). Similarly, the gate of the transistor T2 of each pixel circuit 11 (1,2) to 11 (m, 2) is connected to the select line Ls (2),..., And each pixel circuit 11 (1, n) to 11 (m , n) of the transistor T2 is connected to the select line Ls (n).

  The source as the other end of the transistor T2 of each pixel circuit 11 (1,1) to 11 (1, n) is connected to the data line Ld (1),..., And each pixel circuit 11 (m, 1) to 11 (11). The source of the transistor T2 of (m, n) is connected to the data line Ld (m).

  The data line Ld (u) is connected to one end of the switch Sw1, and the data line Ld (u + 1) is connected to one end of the switch Sw2 (u is 2 to (m-1). For example, m / 2).

  In the case of the pixel circuit 11 (1,1), the transistor T2 is turned on when a Hi level signal is output from the select driver 13 to the select line Ls (1), and the anode of the OLED 111 and the data line Ld (1). Connect.

  When a Lo level signal is output to the select line Ls (1), the transistor T2 is turned off and the anode of the OLED 111 and the data line Ld (1) are disconnected.

  The capacitor C1 is a capacitance component that holds a gate-source voltage (hereinafter referred to as a gate voltage) Vgs of the transistor T3. One end of the capacitor C1 is connected to the source of the transistor T1 and the gate of the transistor T3. Connected to the source of the transistor T3 and the anode of the OLED 111.

  When the drain current Id flows from the anode line La (j) toward the drain of the transistor T2, the capacitor C1 is turned on, and is charged by the gate voltage Vgs of the corresponding transistor T3, and the charge is accumulated. .

  When the transistors T1 and T2 are turned off, the capacitor C1 holds the gate voltage Vgs of the transistor T3.

  As shown in FIG. 1, the display device 1 according to the present embodiment includes a plurality of pixel circuits 11 (i, j), which are connected to the pixel circuits 11 (1,1) to 11 (u, 1) to 11 (1, n). To 11 (u, n) and pixel circuits 11 (u + 1,1) to 11 (m, 1) to 11 (u + 1, n) to 11 (m, n). Each pixel circuit 11 (i, j) includes data drivers 16 (1) and 16 (2) for writing a voltage corresponding to the gradation of the image to each capacitor C1.

  The data drivers 16 (1) and 16 (2) have output terminals DO (1) to DO (u) and DO (u + 1) to DO (m), respectively. Pic and a synchronization signal Sync are supplied, and an output signal corresponding to the image data Pic is output to each output terminal DO (k) (k = 1 to m).

  The output terminals DO (u) to DO (u−1) of the data driver 16 (1) are connected to the data lines Ld (1) to Ld (u−1), and the output terminals DO (u) of the data driver 16 (2). +2) to DO (m) are connected to the data lines Ld (u + 2) to Ld (m), the output terminal DO (u) of the data driver 16 (1) is connected to the input terminal of the switch Sw1, and the data The output terminal DO (u + 1) of the driver 16 (2) is connected to the input terminal of the switch Sw2.

  Then, the photoelectric conversion unit 12 receives, for example, gradation signals D (u) and D (u + 1) having the same gradation value from the controller 19 to the data drivers 16 (1) and 16 (2). The output values corresponding to the output signals output from the data drivers 16 (1) and 16 (2) are measured.

  As shown in FIG. 4, the photoelectric conversion unit 12 includes OLEDs 112 (1) and 112 (2) and light amount measurement units 21 (1) and 21 (2), and includes OLEDs 112 (1) and 112 (2 ) To emit light and measure each light quantity.

  The data drivers 16 (1) and 16 (2) output, for example, gradation currents Idata (u) and Idata (u + 1) as the output signals, and the OLEDs 112 (1) and 112 (2) This is a measurement light emitting element that emits light when supplied with gradation currents Idata (u) and Idata (u + 1) from the data drivers 16 (1) and 16 (2).

  The light quantity measuring units 21 (1) and 21 (2) respectively correspond to the output signals of the data drivers 16 (1) and 16 (2) with respect to the light quantities when the OLEDs 112 (1) and 112 (2) emit light. It is measured as an output value.

  The light quantity measurement unit 21 (1) includes a transistor T4 (1), a transistor T5 (1), and a capacitor C2 (1). The light quantity measurement unit 21 (2) includes a transistor T4 (2) and a transistor T5 (2). ) And a capacitor C2 (2).

  The transistors T4 (1) and T4 (2) and the transistors T5 (1) and T5 (2) are TFTs configured by n-channel FETs, and are configured by, for example, amorphous silicon or polysilicon TFTs.

  Transistors T4 (1) and T4 (2) are photosensor transistors for extracting a source-drain current corresponding to the amount of incident light when the OLED 112 (1) and 112 (2) emit light, respectively. The sensor output signals are converted to OUT (1) and OUT (2). The transistors T4 (1) and T4 (2) may be double gate transistors.

  The sources of the transistors T4 (1) and T4 (2) are connected to the cathode power source 14, and the gates thereof are connected to the controller 19, so that the refresh signals RFSH (1) and RFSH (2) are supplied from the controller 19. .

  The capacitor C2 (1) has both ends connected to the drain and source of the transistor T4 (1) and holds the drain-source voltage of the transistor T4 (1). The capacitor C2 (2) has both ends connected to the drain and source of the transistor T4 (2) and holds the drain-source voltage of the transistor T4 (2).

  The transistors T5 (1) and T5 (2) are transistors that turn on and off, respectively, and control charging and discharging of the capacitors C2 (1) and C2 (2).

  The source of the transistor T5 (1) is connected to the drain of the transistor T4 (1), the gate is connected to the controller 19, and a charge control signal SCG (1) is supplied from the controller 19.

  The source of the transistor T5 (2) is connected to the drain of the transistor T4 (2), the gate is connected to the controller 19, and a charge control signal SCG (2) is supplied from the controller 19.

  The transistors T5 (1) and T5 (2) are turned off when the controller 19 is supplied with charge control signals SCG (1) and (2) having a voltage −V11 (negative or 0), respectively, and the voltage + V11 (positive). Charging control signals SCG (1) and (2) are supplied to turn on.

  5A is a cross-sectional view of the OLED 112 (1) and the transistor T4 (1), FIG. 5B is a plan view of a part of the configuration shown in FIG. 5A, and FIG. It is a top view of OLED112 (1), transistor T4 (1), transistor T5 (1), and capacitor C2 (1).

  The configuration of the OLED 112 (2), transistors T4 (2), T5 (2), and capacitor C2 (2) is the same as that of the OLED 112 (1), transistors T4 (1), T5 (1), and capacitor C2 (1). Therefore, the description is omitted.

  The pixel electrode 112a, the light emitting layer 112e, and the cathode electrode 112c of the OLED 112 (1) are the same as the pixel electrode 111a, the light emitting layer 111e, and the cathode electrode 111c shown in FIG. 3, respectively.

  As shown in FIGS. 5A and 5C, the transistor T4 (1) is configured by connecting two transistors in parallel to increase the light receiving area and to improve the light receiving efficiency. .

  The transistor T4 (1) includes gate electrodes 104g1 and 104g2, drain electrodes 104d1 and 104d2, source electrodes 104s1 and 104s2, semiconductor layers 104c1 and 104c2, protective insulating layers 104i1 and 104i2, and ohmic contact layers 104o1 and 104o2.

  As shown in FIG. 5A, the gate electrodes 104g1 and 104g2 of the transistor T4 (1) are formed on the same glass substrate 101 as the transistor T3, and the gate electrodes 104g1 and 104g2 are covered with the gate insulating film 221. . This gate insulating film 221 is the same as the gate insulating film 121 shown in FIG.

  Then, the semiconductor layers 104c1 and 104c2, the protective insulating layers 104i1 and 104i2, the ohmic contact layers 104o1 and 104o2, the drain electrodes 104d1 and 104d2, and the source electrode 104s of the transistor T4 (1) are formed on the gate insulating film 221. .

  The pixel electrode 112a, the light emitting layer 112e, and the cathode electrode 112c of the OLED 112 (1) are the drain electrodes 104d1 and 104d2, the source electrode 104s, the semiconductor layers 104c1 and 104c2, the protective insulating layers 104i1 and 104i2, and the ohmic contact layer of the transistor T4 (1). It is formed immediately above 104o1 and 104o2. The OLEDs 112 (1) and 112 (2) have the same structure as the OLED 111 of each pixel circuit 11 (i, j) and can be manufactured simultaneously with the OLED 111 in each pixel circuit 11 (i, j). it can.

  The light emitted from the light emitting layer 112e of the OLED 112 (1) is incident on the drain electrodes 104d1 and 104d2 and the source electrode 104s as indicated by arrows in the drawing.

  The insulating films 222 and 223, the partition 224, and the sealing material 225 are the same as the insulating films 122 and 123, the partition 124, and the sealing material 125 shown in FIG.

  A connection wiring 226 is connected to the pixel electrode 112a. The connection wiring 226 is a wiring for connecting the pixel electrode 112a and the output terminal DO (u) of the data driver 16 (1), and is connected to one end of the switch Sw1.

  The transistor T4 (1) is turned on when the refresh signal RFSH (1) having a voltage + V22 (positive) is supplied from the controller 19 and the refresh signal RFSH (1) is set to 0V, so that the amount of incident light is generated between the drain and the source. A channel corresponding to is formed and a drain current flows.

  The transistor T4 (1) is completely turned off when the refresh signal RFSH (1) is set to the voltage −V21 (negative), and the drain current does not flow between the drain and the source.

  The transistor T5 (1) includes a drain electrode 105d, a source electrode 105s, a gate electrode 105g, and a protective film 105i.

  The display device 1 includes OLEDs 112 (1), 112 (2), transistors T4 (1), T4 (2), T5 (1), T5 (2), capacitors C2 (1), C2 (2). In the manufacturing process.

  Returning to FIG. 1, the select driver 13 is a driver that sequentially selects the rows of the pixel circuits 11 (i, j), and includes, for example, a shift register. The select driver 13 is connected to the gates of the transistors T1 and T2 of the pixel circuits 11 (1,1) to 11 (m, 1) through the select line Ls (1),. Are connected to the gates of the transistors T1 and T2 of the pixel circuits 11 (1, n) to 11 (m, n).

  The select driver 13 is supplied with a start signal synchronized with the vertical synchronizing signal from the controller 19 and starts its operation. In accordance with the clock signal supplied from the controller 19, the select driver 13 sequentially operates on the pixel circuits 11 (1,1) in the first row. ˜11 (m, 1),..., A Hi-level row selection signal is output to the pixel circuits 11 (1, n) to 11 (m, n) in the n-th row, and the pixel circuit 11 (i , j) Select each row.

  The anode driver 15 is a driver that outputs a voltage signal of the voltage VL or VH to the anode lines La (1) to La (n), respectively. This voltage VL is set to the same potential as the cathode voltage of the cathode power supply 14, for example. The voltage VH is set to a voltage at which a current flows so that the OLED 111 of each pixel circuit 11 (i, j) emits light, for example, a voltage of about + 15v.

  The anode driver 15 is connected to the drains of the transistors T3 of the pixel circuits 11 (1,1) to 11 (m, 1) via the anode line La (1),..., And via the anode line La (n), respectively. The drains of the transistors T3 of the pixel circuits 11 (1, n) to 11 (m, n) are connected.

  The anode driver 15 starts operating when a start signal is supplied from the controller 19, and operates according to the clock signal supplied from the controller 19.

  The cathode power supply 14 is a power supply for applying a cathode voltage to the cathode of the OLED 111 of each pixel circuit 11 (i, j) and the cathodes of the OLEDs 112 (1) and 112 (2) of the photoelectric conversion unit 12.

  The cathode power supply 14 is connected to the source of the transistor T2 of the pixel circuits 11 (1,1) to 11 (1, n) via the cathode line Lc (1),..., And the pixel circuit via the cathode line Lc (m). 11 (m, 1) to 11 (m, n) are connected to the sources of the transistors T2.

  The cathode power supply 14 is connected to the cathodes of the OLEDs 112 (1) and 112 (2) of the photoelectric conversion unit 12.

  The data drivers 16 (1) and 16 (2) are supplied with gradation signals D (1) to D (m) indicating the gradation of the image from the controller 19, and as described above, the divided pixel circuits 11 ( The driver writes the voltage corresponding to the gradation signals D (1) to D (m) to the capacitor C1 for each i, j).

  The data driver 16 (1) is supplied with gradation signals D (1) to D (u) corresponding to image data from the controller 19 and outputs, for example, gradation signals D (1) to D ( In step u), gradation currents Idata (1) to Idata (u) including current signals having current values in voltage are generated.

  The data driver 16 (1) outputs the generated gradation currents Idata (1) to Idata (u-1) to the output terminals DO (1) to DO (u-1), respectively, and outputs the data line Ld ( 1) to Ld (u-1), the gradation current Idata (u) is output to the output terminal DO (u) and applied to the input terminal of the switch Sw1.

  The data driver 16 (2) is supplied with gradation signals D (u + 1) to D (m) corresponding to image data from the controller 19 as input signals, and as an output signal, for example, a gradation signal D ( Gray-scale currents Idata (u + 1) to Idata (m) composed of current signals having current values corresponding to u + 1) to D (m) are generated.

  The data driver 16 (2) outputs the generated gradation current Idata (u + 1) to the output terminal DO (u + 1), applies it to the input terminal of the switch Sw2, and applies the gradation current Idata (u + 2). ) To Idata (m) are output to the output terminals DO (u + 2) to DO (m), respectively, and are output to the data lines Ld (u + 2) to Ld (m).

  The data drivers 16 (1) and 16 (2) are not limited to a configuration that generates gradation currents Idata (1) to Idata (u) and Idata (u + 1) to Idata (m) as output signals. Instead, gradation voltages Vdata (1) to Vdata (u) and Vdata (u + 1) to Vdata (m) made of voltage signals may be generated instead.

  The sensor signal processing unit 17 processes the sensor output signals OUT (1) and OUT (2) output from the light amount measuring unit 21 (1) or the light amount measuring unit 21 (2) of the photoelectric conversion unit 12. As shown in FIG. 4, a sense amplifier 31 and an output buffer 32 are provided.

  The sense amplifier 31 amplifies the voltage of the sensor output signal OUT (1) and the voltage of the sensor output signal OUT (2) output from the light amount measurement unit 21 (1) or the light amount measurement unit 21 (2) of the photoelectric conversion unit 12. To do. The sense amplifier 31 supplies the amplified voltage to the output buffer 32.

  The output buffer 32 outputs the voltage supplied from the sense amplifier 31 to the controller 19 as output values Vout (1) and Vout (2).

  The power source 18 is for applying the voltage VDD to the light amount measuring unit 21 (1) or the light amount measuring unit 21 (2) of the photoelectric conversion unit 12.

  The switches Sw1 and Sw2 are respectively in accordance with switch control signals Csw1 and Csw2 supplied from the controller 19, and the OLED 112 (1) and the data driver 16 (1), the OLED 112 (2) and the data driver 16 (2) of the photoelectric conversion unit 12. This is a switch that connects and disconnects with.

  The switch Sw1 is supplied with a switch control signal Csw1 (off) from the controller 19 to connect the data driver 16 (1) and the data line Ld (u), and is supplied with a switch control signal Csw1 (on) to transmit data. The driver 16 (1) and the OLED 112 (1) are connected.

  The switch Sw2 is supplied with the switch control signal Csw2 (off) from the controller 19, connects the data driver 16 (2) and the data line Ld (u + 1), and is supplied with the switch control signal Csw2 (on). The data driver 16 (2) and the OLED 112 (2) are connected.

  The switch Sw3 connects the light quantity measuring units 21 (1) and 21 (2) of the photoelectric conversion unit 12 to the power supply 18 or the sensor signal processing unit 17 of the voltage VDD according to the switch control signal Csw3 supplied from the controller 19. It is a switch for.

  The switch Sw3 is supplied with a switch control signal Csw3 (c) from the controller 19, and connects the power supply 18 of the voltage VDD and the light quantity measuring units 21 (1) and 21 (2) of the photoelectric conversion unit 12.

  The switch Sw3 is supplied with a switch control signal Csw3 (s) from the controller 19, and connects the sensor signal processing unit 17 and the light amount measurement units 21 (1) and 21 (2) of the photoelectric conversion unit 12.

  Further, the switch Sw3 becomes neutral when the switch control signal Csw3 (n) is supplied from the controller 19, and the photoelectric conversion unit 12 is disconnected from the power source 18 and the sensor signal processing unit 17.

  For example, the display signal generation circuit 20 receives a video signal such as a composite video signal and a component video signal from the outside, and acquires image data Pic such as a luminance signal and a synchronization signal Sync from the supplied video signal. is there. The display signal generation circuit 20 supplies the acquired image data Pic and synchronization signal Sync to the controller 19.

  The controller 19 controls each unit, and includes a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory).

  The controller 19 supplies the select driver 13, the cathode power source 14, the anode driver 15, and the data drivers 16 (1) and 16 (2) with a start signal, a clock signal, and other various control signals to start the operation.

  Further, when the image data Pic is supplied from the display signal generation circuit 20, the controller 19 sends to the data drivers 16 (1) and 16 (2) gradation signals D (1) to D (D) corresponding to the image data Pic. u), D (u + 1) to D (m) are output.

  Further, the controller 19 uses the photoelectric conversion unit 12 to measure output values corresponding to the output signals of the data drivers 16 (1) and 16 (2), for example, immediately after power-on or periodically. Thus, the values of the output signals of the data drivers 16 (1) and 16 (2) are corrected.

  In order to correct the value of the output signal, the controller 19 applies to the data drivers 16 (1) and 16 (2) gradation signals D (u) and D (u + 1) having the same gradation value, for example, the highest gradation value. ).

  The controller 19 has gradation currents Idata (u) and Idata (u +) corresponding to the gradation signals D (u) and D (u + 1) output from the data drivers 16 (1) and 16 (2), respectively. The light quantity of the OLEDs 112 (1) and 112 (2) of the photoelectric conversion unit 12 that emits light is measured according to 1).

  The controller 19 sets values based on the measured light amounts of the OLEDs 112 (1) and 112 (2) as output values corresponding to the output signals of the data drivers 16 (1) and 16 (2). Then, the controller 19 corrects the values of the output signals of the two data drivers 16 (1) and 16 (2) based on the correlation between the output values, such as the ratio between the measured output values. .

  Next, the operation of the display device 1 according to this embodiment will be described. First, an operation for obtaining a correction value for correcting the value of the output signal between the two data drivers 16 (1) and 16 (2) will be described.

  As shown in FIG. 6, the controller 19 supplies a refresh signal RFSH (1) having a voltage + V22 to the photoelectric conversion unit 12 at times t11 to t12.

  The transistor T4 (1) of the light quantity measuring unit 21 (1) is turned on when the refresh signal RFSH (1) is supplied, and the capacitor C2 (1) is discharged.

  At time t12 after the discharge, the controller 19 sets the refresh signal RFSH (1) to the voltage −V21, supplies the charge control signal SCG (1) of the voltage + V12 to the photoelectric conversion unit 12, and the switch control signal Csw3 (c ) Is supplied to the switch Sw3.

  The transistor T4 (1) is turned off when the refresh signal RFSH (1) having the voltage −V21 is supplied to the gate, and the transistor T5 (1) is turned on when the charge control signal SCG (1) having the voltage + V12 is supplied to the gate. To do.

  The switch Sw <b> 3 is supplied with a switch control signal Csw <b> 3 (c) from the controller 19 to connect the power supply 18 with the voltage VDD and the photoelectric conversion unit 12, and the voltage VDD is applied to the photoelectric conversion unit 12.

  When the voltage VDD of the power supply 18 is applied to the photoelectric conversion unit 12, the transistor T5 (1) is turned on, so that the capacitor C2 (1) is charged with the voltage VDD.

  When the capacitor C2 (1) is charged and the time t13 is reached, the controller 19 drops the charge control signal SCG (1) to the voltage −V11, sets the refresh signal RFSH (1) to 0V, and sets the switch control signal Csw3 ( n) is supplied to the switch Sw3.

  The switch Sw3 is supplied with a switch control signal Csw3 (n) from the controller 19 to disconnect the photoelectric conversion unit 12 from the power supply 18 of the voltage VDD and the sensor signal processing unit 17, and the transistor T5 (1) has a voltage −V11 at its gate. The charging control signal SCG (1) is supplied and turned off.

  Then, the controller 19 outputs the gradation signal D (u) having the maximum voltage Vmax to the data driver 16 (1), and supplies the switch control signal Csw1 (on) to the switch Sw1.

  The switch Sw1 is supplied with a switch control signal Csw1 (on) from the controller 19 to connect the data driver 16 (1) and the OLED 112 (1).

  For example, when the gradation signal D (u) having the highest gradation is supplied from the controller 19, the data driver 16 (1) generates a gradation current Idata (u) of a current corresponding to the highest gradation. Output to the switch Sw1.

  The OLED 112 (1) emits light by being supplied with the gradation current Idata (u), and the light emitted from the light emitting layer 112e of the OLED 112 (1) is applied to the transistor T4 (1) disposed immediately below the light emitting layer 112e. Irradiated, a channel corresponding to the amount of incident light is formed between the drain and source of the transistor T4 (1).

  A drain current corresponding to the amount of incident light begins to flow between the drain and source of the transistor T4 (1), and the capacitor C2 (1) starts discharging according to this current.

  At time t14 set in advance from time t13, the controller 19 supplies the photoelectric conversion unit 12 with the charge control signal SCG (1) of voltage −V11 and sets the refresh signal RFSH (1) to voltage −V21. Then, the switch control signal Csw3 (s) is supplied to the switch Sw3.

  The drain current of the transistor T4 (1) of the light quantity measuring unit is not supplied with the refresh signal RFSH (1) having the voltage −V21, and the voltage of the capacitor C2 (1) is held.

  In addition, the transistor T5 (1) is turned on when the charge control signal SCG (1) of voltage + V12 is supplied, and the switch Sw3 is supplied with the switch control signal Csw3 (s) from the controller 19 so that the sensor signal processing unit 17 and the photoelectric conversion signal are connected. When the conversion unit 12 is connected, the sensor output signal OUT (1) is supplied from the photoelectric conversion unit 12 to the sense amplifier 31 of the sensor signal processing unit 17.

  The sense amplifier 31 amplifies the voltage of the sensor output signal OUT (1), and the output buffer 32 outputs the amplified voltage to the controller 19 as an output value Vout (1).

  From time t16 to t17, the controller 19 supplies the refresh signal RFSH (2) of voltage + V22 to the photoelectric conversion unit 12 to discharge the capacitor C2 (2). At time t17 after the discharge, the controller 19 refreshes. The signal RFSH (2) is set to the voltage −V21, and the charge control signal SCG (2) of the voltage + V11 is supplied to the photoelectric conversion unit 12.

  Further, the controller 19 supplies the switch control signal Csw3 (c) to the switch Sw3, and charges the capacitor C2 (2) with the voltage VDD.

  At time t18, the controller 19 drops the charge control signal SCG (2) to the voltage −V11, sets the refresh signal RFSH (2) to 0V, and supplies the switch control signal Csw3 (n) to the switch Sw3.

  The controller 19 supplies the gradation signal Vdata (u + 1) having the maximum voltage Vmax to the data driver 16 (2), and supplies the switch control signal Csw2 (on) to the switch Sw2.

  The time t18 to t19 and the time t13 to t14 are set to be the same. At this time t19, the controller 19 supplies the photoelectric control unit 12 with the charge control signal SCG (2) of the voltage + V11 and the voltage −V21. The refresh signal RFSH (2) is supplied.

  At time t20, the controller 19 supplies the switch control signal Csw3 (s) to the switch Sw3.

  When the sensor signal processing unit 17 and the photoelectric conversion unit 12 are connected, the sense amplifier 31 of the sensor signal processing unit 17 is supplied with the sensor output signal OUT (2) from the photoelectric conversion unit 12, and this sensor output signal OUT ( The voltage of 2) is amplified, and the output buffer 32 outputs the amplified voltage to the controller 19 as an output value Vout (2).

  The controller 19 acquires the output values Vout (1) and Vout (2) output from the output buffer 32. Then, a comparison operation between the output value Vout (1) and the output value Vout (2) is performed.

  That is, the controller 19 compares the output values Vout (1) and Vout (2) using, for example, the output value Vout (1) of the output values Vout (1) and Vout (2) as a reference output value. Then, the controller 19 calculates the ratio α = Vout (2) / Vout (1) of the output value Vout (2) with respect to the output value Vout (1), and based on the value of this ratio α, the data driver 16 (2 ) To obtain a correction value for the output signal value and store it.

  Here, when the TFT panel 11 performs color display, each pixel is provided with an OLED 111 having a red, green, or blue emission color, and pixels having the same emission color OLED 111 in the column direction are arranged. The pixels having the OLEDs 111 having different emission colors are arranged for each column.

  In this case, the OLEDs 111 of the respective emission colors have different emission characteristics. Therefore, in order to obtain a good white balance, the output value Vout corresponding to the output signal output from each output terminal DO (u), DO (u + 1) of the data driver 16 (1), 16 (2). The values of (1) and Vout (2) are set to values that match the emission color of the OLED 111 of the pixels connected to the corresponding data lines Ld (u) and Ld (u + 1).

  That is, even when there is no difference in characteristics between the data drivers 16 (1) and 16 (2), gradation signals D (u) and D (u + 1) having the same gradation value are supplied to both. The output values Vout (1) and Vout (2) corresponding to the output signals output from the output terminals DO (u) and DO (u + 1) of the data drivers 16 (1) and 16 (2). Are not the same value, but a value that matches the emission color of the corresponding OLED 111.

  However, in this case, the correlation between the output values Vout (1) and Vout (2) when there is no characteristic difference between the data drivers 16 (1) and 16 (2), that is, the output values Vout (1) and Vout ( Since the ratio of 2) has a preset value and is known, the data driver 16 (1), 16 (2) is compared by comparing the ratio α with the preset ratio. ) Can be determined whether there is a difference in characteristics.

  The correction value can be acquired based on a comparison between the ratio α and a preset ratio.

  In the above, the output values Vout (1) and Vout (2) are sent to the data drivers 16 (1) and 16 (2) connected to the adjacent data lines Ld (u) and Ld (u + 1). The output signals are output from the output terminals DO (u) and DO (u + 1), but the output values Vout (1) and Vout (2) are, for example, close and have the same emission color. A configuration corresponding to an output signal output from the output terminals of the data drivers 16 (1) and 16 (2) connected to the data line corresponding to the OLED 111 may be adopted.

  In this case, the output values Vout (1) and Vout (2) when there is no difference in characteristics between the data drivers 16 (1) and 16 (2) are the same value, so the data drivers 16 (1) and 16 (2 ), It is possible to simplify the operation related to the determination of whether there is a difference in characteristics between them and the acquisition of the correction value.

  Next, an operation when displaying an image based on the supplied video signal will be described. First, the anode driver 15 outputs a voltage signal having the same voltage VL as the cathode voltage of the cathode power supply 14 to the anode lines La (1) to La (n).

  The controller 19 supplies switch control signals Csw1 (off) and Csw2 (off) to the switches Sw1 and Sw2, respectively.

  The switch Sw1 is supplied with a switch control signal Csw1 (off) from the controller 19 to connect the data line Ld (u) and the data driver 16 (1). The switch Sw2 is supplied with a switch control signal Csw2 (off) from the controller 19 to connect the data line Ld (u + 1) and the data driver 16 (2).

  The video signal is supplied to the display signal generation circuit 20, and the display signal generation circuit 20 supplies the controller 19 with the image data Pic and the synchronization signal Sync based on the supplied video signal. The controller 19 is supplied with the image data Pic and the synchronization signal Sync, supplies control signals to the select driver 13, the cathode power supply 14, the anode driver 15, and the data drivers 16 (1) and 16 (2). The cathode power supply 14, the anode driver 15, and the data drivers 16 (1) and 16 (2) start operation.

  The select driver 13 outputs a Hi level select signal to the select line Ls (1), and selects the pixel circuits 11 (1,1) to 11 (m, 1) in the first row.

  The controller 19 performs gradation signals D (1) to D (u) corresponding to the supplied image data in the selection period for selecting the pixel circuits 11 (1,1) to 11 (m, 1) in the first row. ) Is supplied to the data driver 16 (1).

  The controller 19 multiplies the supplied image data by the correction value to generate gradation signals D (u + 1) to D (m) corresponding to the data driver 16 (2). The signals D (u + 1) to D (m) are supplied to the data driver 16 (2).

  The data driver 16 (1) is supplied with the gradation signals D (1) to D (u) and outputs gradation signals of currents corresponding to the gradation signals D (1) to D (u) as output signals. Idata (1) to Idata (u) are generated.

  The data driver 16 (1) outputs the generated gradation currents Idata (1) to Idata (u) to the data lines Ld (1) to Ld (u), respectively.

  The data driver 16 (1) outputs the generated gradation current Idata (u) to the data line Ld (u) via the switch Sw1.

  The data driver 16 (2) is supplied with the gradation signals D (u + 1) to D (m) and outputs currents corresponding to the gradation signals D (u + 1) to D (m) as output signals. Gradation currents Idata (u + 1) to Idata (m) are generated.

  Then, the data driver 16 (2) outputs the gradation current Idata (u + 1) to the data line Ld (u + 1) via the switch Sw2.

  The data driver 16 (2) outputs gradation currents Idata (u + 1) to Idata (m) to the data lines Ld (u + 1) to Ld (m).

  When the gradation signals Idata (1) to Idata (m) are output to the data lines Ld (1) to Ld (m), respectively, the pixel circuits 11 (1,1) to 11 (m, 1) Voltages corresponding to the gradation signals D (1) to D (u) are written in the capacitor C1.

  Similarly, the select driver 13 sequentially outputs a Hi level select signal to the select lines Ls (2),..., Ls (n), and the pixel circuit 11 (1,2) in the second row. ... 11 (m, 2),..., When the pixel circuit 11 (1, n) to 11 (m, n) in the nth row is selected, the selected pixel in the jth row in each selection period Voltages corresponding to the gradation signals D (1) to D (u) are written in the capacitors C1 of the circuits 11 (1, j) to 11 (m, j).

  When voltages corresponding to the gradation signals D (1) to D (m) are written in the capacitors C1 of all the pixel circuits 11 (i, j), the anode driver 15 is controlled by the controller 19 to A voltage signal of VH is output to the anode lines La (1) to La (n).

  The transistor T3 of each pixel circuit 11 (i, j) supplies the OLED 111 with a current amount corresponding to the voltage written in the capacitor C1, and the OLED 111 emits light with luminance corresponding to the supplied current amount. To do.

  Since the current values of the gradation currents Idata (u + 1) to Idata (m) of the data driver 16 (2) are corrected with the correction values, the data drivers 16 (1) and 16 (2) before the correction are corrected. Even if there is a difference in characteristics, the luminance step at the boundary between the data drivers 16 (1) and 16 (2) is reduced.

  As described above, according to the present embodiment, the display device 1 measures the output values of the data drivers 16 (1) and 16 (2) and corrects the values of the output signals. .

  Therefore, even if there is a difference in characteristics between the data drivers 16 (1) and 16 (2), the luminance difference between the data drivers 16 (1) and 16 (2) can be reduced, and the display quality can be improved. Can be improved.

  Then, the correction of the value of the output signal according to the present invention can be automatically performed according to a predetermined program, for example, under the control of the controller 19, and is much shorter than the case of manual adjustment. Therefore, there is no increase in cost when correcting the value of the output signal.

  Moreover, the correction of the value of the output signal is not limited to the initial stage of manufacture of the display device 1, and can be performed at an arbitrary timing. In this case, the correction of the value of the output signal between the data drivers is appropriately performed. Thus, it is possible to suppress the occurrence of unevenness over a long period of time and achieve an excellent effect of maintaining the display quality over a long period of time.

  Next, the arrangement of the photoelectric conversion unit 12 and the sensor signal processing unit 17 in the display device 1 will be described. FIG. 7 shows an outline of the mounting arrangement of the select driver 13, the anode driver 15, the data drivers 16 (1) and 16 (2), the photoelectric conversion unit 12, and the sensor signal processing unit 17 for the TFT panel 11 in this embodiment. FIG.

  As shown in FIG. 7, a TFT panel 11 including a plurality of pixel circuits 11 (i, j) is formed on a glass substrate 101. The select driver 13, the anode driver 15, and the data drivers 16 (1) and 16 (2) are mounted on the glass substrate 101.

  The select driver 13 is connected to the TFT panel 11 via a plurality of select lines Ls (1) to Ls (n) formed on the glass substrate 101, and the anode driver 15 is connected to the plurality of select lines Ls (1) to Ls (n) formed on the glass substrate 101. Are connected to the TFT panel 11 through the anode lines La (1) to La (n). The data driver 16 (1) is connected to the TFT panel 11 via data lines Ld (1) to Ld (u) formed on the glass substrate 101, and the data driver 16 (2) is formed on the glass substrate 101. The TFT panel 11 is connected via the data lines Ld (u + 1) to Ld (m). For convenience, the cathode power supply 14 is omitted in FIG.

  Here, as shown in FIG. 4, the photoelectric conversion unit 12 is configured by two OLEDs, four transistors, and two capacitors, and the sensor signal processing unit 17 is also configured by several transistors. The switches Sw1, Sw2, and Sw3 are also composed of several transistors.

  Therefore, the area occupied by the photoelectric conversion unit 12, the sensor signal processing unit 17, and the switches Sw1, Sw2, and Sw3 is sufficiently smaller than each driver such as a data driver. On the other hand, the data lines Ld (1) to Ld (m) connected to the data drivers 16 (1) and 16 (2) are partially bent as shown in FIG. It is often connected to (1) and 16 (2).

  In this case, a gap as large as the data driver 16 (1) and the data driver 16 (2) on the glass substrate 101 and the data lines Ld (1) to Ld (m) are formed. And the photoelectric conversion part 12, the sensor signal process part 17, and switch Sw1, Sw2, Sw3 can be provided on the glass substrate 101 of this clearance gap.

  In such a case, even if the display device 1 includes the photoelectric conversion unit 12, the sensor signal processing unit 17, and the switches Sw1, Sw2, and Sw3, the outer size of the glass substrate 101 can be kept unchanged. In addition, when the present invention is applied, the cost of the display device 1 is not increased.

<Second Embodiment>
FIG. 8 shows a configuration of a display device according to the second embodiment of the present invention, and FIG. 9 shows configurations of a photoelectric conversion unit and a sensor signal processing unit in this embodiment. The display device 1 according to the embodiment of the present invention is not limited to the one having the configuration shown in FIG. 1, and may be one in which the switches Sw1 and Sw2 shown in FIG. 1 are omitted, for example. The display device 1 in the present embodiment shown in FIG. 8 is different from the configuration shown in FIG. 1 in that the switches Sw1 and Sw2 are omitted. In addition, about the structure equivalent to the said FIG. 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 8, in the display device 1 of the present embodiment, the data drivers 16 (1) and 16 (2) have measurement output terminals DO (c) and DO (c) that output measurement output signals, respectively. d).

  The display device 1 includes a measurement output terminal DO (c) of the data driver 16 (1) and the photoelectric conversion unit 12, a measurement output terminal DO (d) of the data driver 16 (2), the photoelectric conversion unit 12, and the like. And the data drivers 16 (1) and 16 (2) supply the measurement gradation current to the photoelectric conversion unit 12 through the connection lines, respectively.

  Then, as shown in FIG. 9, the photoelectric conversion unit 12 outputs the gray scales output from the measurement output terminals DO (c) and DO (d) of the data drivers 16 (1) and 16 (2), respectively. The OLEDs 112 (1) and 112 (2) are caused to emit light with current, and output values Vout (1) and Vout (2) corresponding to the output signals of the data drivers 16 (1) and 16 (2) are measured.

<Third Embodiment>
FIG. 10 shows the configuration of a display device according to the third embodiment of the present invention, and FIG. 11 shows the configurations of a photoelectric conversion unit and a sensor signal processing unit in this embodiment.
In the first and second embodiments, the photoelectric conversion unit is provided with two photoelectric measurement units. However, the present invention is not limited to this. One photoelectric measurement unit is provided, and one photoelectric measurement unit is provided for each data driver. You may make it share a measurement part.

  The configuration of the present embodiment shown in FIGS. 10 and 11 is the same as the configuration shown in FIGS. 1 and 4 except that the switches Sw1 and Sw2 are not provided, the switch Sw4 is provided, and the light quantity measuring unit in the photoelectric conversion unit is one. Is different. In addition, about the structure equivalent to the said FIG. 1, FIG. 4, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 10, the display device 1 of this embodiment includes a photoelectric conversion unit 12a and a switch Sw4 connected to the photoelectric conversion unit 12a, and the data drivers 16 (1) and 16 (2) are respectively Measurement output terminals DO (e) and DO (f) for outputting measurement output signals are provided.

  The measurement output terminal DO (e) is connected to one end of the switch Sw4, and the measurement output terminal DO (f) is connected to the other end of the switch Sw4. Then, the display device 1 appropriately switches the switch Sw4 to switch either the measurement output terminal DO (d) of the data driver 16 (1) or the measurement output terminal DO (e) of the data driver 16 (2). The gradation current for measurement is supplied to the photoelectric conversion unit 12a by connecting to the photoelectric conversion unit 12a.

  As shown in FIG. 11, the photoelectric conversion unit 12a includes one OLED 112 and one light quantity measurement unit 21, and one end of the OLED 112 is connected to the switch Sw4.

  Then, the controller 19 supplies a switch control signal Csw4 to the switch Sw4, switches the switch Sw4, and outputs the measurement gradations output from the data drivers 16 (1) and 16 (2) via the switch Sw4. Current is supplied to the OLED 112.

  Then, the photoelectric conversion unit 12a sequentially causes the OLED 112 to emit light with the gradation current output from the measurement output terminals DO (d) and DO (e) of the data drivers 16 (1) and 16 (2). Output values Vout (1) and Vout (2) corresponding to the output signals of the data drivers 16 (1) and 16 (2) are measured.

  In carrying out the present invention, various forms are conceivable and the present invention is not limited to the above embodiment. In the first and second embodiments, the photoelectric conversion unit 12 includes two OLEDs and two light amount measurement units corresponding to the respective OLEDs. The light sensor transistor T4 may be formed so as to straddle two OLEDs, and the light quantity measuring unit may be configured as one.

  Further, in each of the above embodiments, the controller 19 multiplies the current values of the grayscale currents Idata (u + 1) to Idata (m) by the correction value to obtain the grayscale currents Idata (u + 1) to Idata (m). The whole current value was corrected. However, if there is no problem in display quality, the data driver 16 (2) may correct only the current value of the gradation current Idata (u + 1).

  In each of the above embodiments, the output value Vout (1) is set as the reference output value, and α = Vout (2) / Vout (1), and the current values of the gradation currents Idata (u + 1) to Idata (m) are corrected. I tried to do it. However, the current value of the gradation currents Idata (1) to Idata (u) may be corrected by setting the output value Vout (2) as a reference output value and α = Vout (1) / Vout (2). .

  Further, instead of the controller 19 correcting the gradation current, each data driver 16 (1), 16 (2) makes the gradation signals D (1) to D (u) or D (u) based on the correction value α. +1) to D (m) may be corrected.

  In the above embodiment, there are two data drivers. However, the number of data drivers is not limited to two but may be three or more. In the case of three or more, the display device 1 includes a photoelectric conversion unit 12 for each boundary, and the controller 19 uses, for example, an output value corresponding to the output signal of any one of the data drivers as a reference output value. The correction value for the data driver is acquired.

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 11 (i, j) ... Pixel circuit, 12 ... Photoelectric conversion part, 13 ... Select driver, 14 ... Cathode power supply, 15 ... Anode driver, 16 ( 1), 16 (2) ... Data driver, 17 ... Sensor signal processing unit, 18 ... Power supply, 19 ... Controller, 20 ... Display signal generation circuit, 21 (1), 21 ( 2) ... light quantity measuring unit, 111, 112 (1), 112 (2) ... OLED

Claims (8)

A plurality of pixels each having a display light emitting element formed in a display region provided on the substrate; a plurality of data lines connected to each pixel; and the plurality of data lines provided adjacent to each other on the substrate, A plurality of data drivers connected to the data line, an output measurement unit formed in a circuit formation region provided on the substrate, and a control unit,
Each of the data drivers outputs an output signal with respect to an input signal, and at least a part has a plurality of output terminals connected to the data lines,
The output measurement unit includes a measurement light emitting element that emits light when supplied with the output signal output from one specific output terminal of the plurality of output terminals of each data driver, and the measurement light emitting element emits light. the amount of light measured with a light receiving element for detecting the amount by receiving the emitted light, the emitted light amount of the measuring light-emitting devices which are detected by the light receiving element, as an output value corresponding to the value of the output signal when possess and measurement unit, the,
The control unit acquires a correction value for correcting the value of the output signal of each data driver based on the correlation of the output values corresponding to each of the plurality of data drivers measured by the output measurement unit,
The plurality of data drivers include a first data driver and a second data driver adjacent to each other,
The plurality of data lines include a first data line and a second data line adjacent to each other, and the first data line is connected to a first output terminal of the first data driver; A second data line is connected to a second output terminal of the second data driver;
An interval between the first output terminal and the second output terminal is larger than an interval between the first data line and the second data line in the display area,
The first data line and the second data line are between the display area, the first data driver, and the second data driver, and the first data line and the second data line. Is bent so as to be larger than the interval between the first data line and the second data line in the display area,
The display device, wherein the circuit formation region is provided in a gap formed between the bent first data line and the second data line. The display device according to claim 1 , wherein the display light emitting element in each pixel and the measurement light emitting element in the output measurement unit are formed on the same substrate. A first data driver and a second data driver in the plurality of data drivers connected to each of the two adjacent data lines of the plurality of data lines;
The output measurement unit is provided corresponding to the first and second data drivers, and the measurement light emitting element and the light amount measurement unit correspond to the first and second data drivers, respectively. 2 sets to do,
The display device according to claim 1 or 2 . A first data driver and a second data driver in the plurality of data drivers connected to each of the two adjacent data lines of the plurality of data lines;
The output measurement unit is provided corresponding to the first and second data drivers, and the measurement light emission unit corresponding to each of the single light amount measurement unit and the first and second data drivers. An element,
Wherein said light receiving element of the light quantity measuring section, a display device according to claim 1 or 2, characterized in that it is configured as capable of receiving the light emitted from the two measuring light-emitting devices. A first changeover switch provided corresponding to each of the first and second data drivers, wherein the first changeover switch includes the one changeover switch of each of the first and second data drivers; the display device according to an output terminal, to claim 3 or 4, characterized in that switching to connect to one of the measuring light-emitting devices or the data line. Each of the data drivers includes a measurement output terminal that outputs a measurement output signal as the specific output terminal, and the measurement output terminal of each of the data drivers is connected to each of the measurement light emitting elements. the display device according to claim 3 or 4, characterized in that. A first data driver and a second data driver in the plurality of data drivers connected to each of the two adjacent data lines of the plurality of data lines;
Each of the data drivers includes a measurement output terminal that outputs a measurement output signal as the specific output terminal,
The output measuring unit is provided corresponding to the first and second data drivers, and includes a single light emitting element for measurement and a single light amount measuring unit.
A second changeover switch provided corresponding to each of the first and second data drivers, wherein the second changeover switch connects the light emitting element for measurement to the first and second data drivers; the display device according to claim 1 or 2, characterized in that switching to connect to one of each said measurement output terminal. The controller is
The ratio of the output value corresponding to each data driver measured by the output measurement unit to the reference output value, with any one of the output values corresponding to each of the plurality of data drivers as a reference output value display device according to any one of claims 1 to 7, characterized in that for acquiring the correction value based on.

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