JP2011123213A - Display device, driving method of the same and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of suppressing power consumption, a method for driving the device, and an electronic apparatus. <P>SOLUTION: The display device includes a display panel 10, having a display region 10A where a plurality of display pixels 15 containing organic EL elements 11 (11R, 11G, 11B) and pixel circuits 13 are arranged in a two-dimensional manner a non-display region 10B, where a single adjusting pixel 18 containing organic El elements 12 (12R, 12G, 12B) and pixel circuits 16 is arranged. A signal line drive circuit 23 outputs a video signal 22A to a signal line DTL corresponding to the adjusting pixel 18, with the video signal representing the maximum luminance being extracted by each emission color in a video signal processing circuit 22, and a power source voltage adjustment circuit 26 derives a power supply voltage, according to the voltage change in the organic EL element 12 by emission colors; extracts the highest power source voltage in the derived power source voltages by the emission color derived; and applies the extracted power source voltage to each display pixel 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device in which a light emitting element is provided on a display panel and a driving method thereof. Moreover, this invention relates to the electronic device provided with the said display apparatus.

  In recent years, in the field of display devices that perform image display, display devices that use current-driven optical elements, such as organic EL (electroluminescence) elements, whose light emission luminance changes according to the value of a flowing current are used as light emitting elements of pixels. Developed and commercialized. Unlike a liquid crystal element or the like, the organic EL element is a self-luminous element. Therefore, a display device (organic EL display device) using an organic EL element does not require a light source (backlight), and thus can be made thinner and brighter than a liquid crystal display device that requires a light source. . In particular, when the active matrix method is used as the driving method, each pixel can be lit in hold, and the power consumption can be reduced. Therefore, organic EL display devices are expected to become the mainstream of next-generation flat panel displays.

  The organic EL element is a current-driven light-emitting element, and is an element capable of adjusting gradation by controlling the amount of current flowing through the organic EL element. However, the organic EL element has a property that the IV characteristic changes according to the energization time and the element temperature. For this reason, the drive transistor for controlling the amount of current flowing in the organic EL element is always driven in the saturation region in order to obtain a constant luminance even when the IV characteristic changes over time. (See Patent Document 1).

Japanese Patent Laid-Open No. 2001-60076

  By the way, in order to always drive the drive transistor in the saturation region under the situation where the IV characteristic of the organic EL element fluctuates with time, the power supply voltage is changed when the IV characteristic of the organic EL element fluctuates. It is necessary to set the driving transistor to a sufficiently high value so that the driving transistor is not linearly driven. For example, when the voltage between the terminals of the organic EL element is expected to increase by about 2V due to fluctuations in the IV characteristics of the organic EL element, the power supply voltage is set to a voltage value with a margin of about 2V in advance. It is possible to set. However, when a margin is provided in advance in the power supply voltage, there is a problem that the power consumption is excessively increased by the margin.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a display device that can reduce power consumption, a driving method thereof, and an electronic apparatus.

  In the first display device according to the present invention, a display area in which a plurality of types of display pixels having different emission colors are arranged, and a plurality of types of adjustment pixels that emit the same type of color light as the emission color of the display pixels are arranged. A display unit having a non-display area and a drive unit that drives each display pixel based on a video signal are provided. Here, the adjustment pixel includes a light emitting element. In addition, the driving unit derives a power supply voltage having a value corresponding to a voltage variation of the light emitting element included in the plurality of types of adjustment pixels for each light emission color, and uses the derived power supply voltage for each light emission color for the plurality of types of display pixels. And it applies to at least each display pixel among a plurality of types of adjustment pixels in correspondence with each emission color.

  A first electronic device according to the present invention includes the first display device.

The first display device driving method according to the present invention includes a display area in which a plurality of types of display pixels having different emission colors are arranged, and a plurality of types of adjustment pixels that emit the same type of color light as the emission color of the display pixels. A display device that includes a display unit having a non-display area and a drive unit that drives each display pixel based on a video signal, and the adjustment pixel includes a light emitting element includes the following steps.
(1) A power supply voltage having a value corresponding to a voltage variation of a light emitting element included in a plurality of types of adjustment pixels is derived for each emission color, and the derived power supply voltage for each emission color is represented by a plurality of types of display pixels and a plurality of types. Applying to at least each display pixel among the adjustment pixels corresponding to each emission color

  In the first display device, the driving method thereof, and the first electronic device according to the present invention, a power supply voltage having a value corresponding to a voltage variation of the light emitting element included in the plurality of types of adjustment pixels is derived for each emission color. The power supply voltage for each emission color is applied to at least each display pixel among the plurality of types of display pixels and the plurality of types of adjustment pixels in correspondence with each emission color. As a result, the value of the power supply voltage can be set to be smaller than the case where the power supply voltage is previously provided with a margin corresponding to the expected voltage fluctuation of the light emitting element.

  The second display device according to the present invention includes a display area in which a plurality of types of display pixels having different emission colors are arranged, and a plurality of types of adjustment pixels that emit the same type of color light as the emission color of the display pixels. A display unit having a non-display area and a drive unit that drives each display pixel based on a video signal are provided. Here, the adjustment pixel includes a light emitting element. In addition, the drive unit derives a power supply voltage having a value corresponding to a voltage variation of the light emitting element included in the plurality of types of adjustment pixels for each emission color, and has the largest value among the derived power supply voltages for each emission color. A power supply voltage is extracted, and the extracted power supply voltage is applied to at least each display pixel among a plurality of types of display pixels and a plurality of types of adjustment pixels.

  A second electronic device according to the present invention includes the second display device.

The second display device driving method according to the present invention includes a display area in which a plurality of types of display pixels having different emission colors are arranged, and a plurality of types of adjustment pixels that emit the same type of color light as the emission color of the display pixels. A display device that includes a display unit having a non-display area and a drive unit that drives each display pixel based on a video signal, and the adjustment pixel includes a light emitting element includes the following steps.
(1) A power supply voltage having a value corresponding to voltage fluctuations of light emitting elements included in a plurality of types of adjustment pixels is derived for each emission color, and a power supply voltage having the largest value among the derived power supply voltages for each emission color is derived. The step of extracting and applying the extracted power supply voltage to at least each display pixel among a plurality of types of display pixels and a plurality of types of adjustment pixels

  In the second display device, the driving method thereof, and the second electronic device according to the present invention, a power supply voltage having a value corresponding to the voltage variation of the light emitting element included in the plurality of types of adjustment pixels is derived for each emission color. The largest power supply voltage is extracted from the derived power supply voltages for each emission color, and the extracted power supply voltage is applied to at least each display pixel among the plurality of types of display pixels and the plurality of types of adjustment pixels. The As a result, the value of the power supply voltage can be set to be smaller than the case where the power supply voltage is previously provided with a margin corresponding to the expected voltage fluctuation of the light emitting element.

  According to the first and second display devices, the driving methods thereof, and the first and second electronic devices according to the present invention, the power supply voltage is previously provided with a margin corresponding to the expected voltage fluctuation of the light emitting element. Compared to the case, the power supply voltage can be set smaller. Thereby, power consumption can be kept low.

It is the schematic showing an example of the structure of the display apparatus which concerns on one embodiment by this invention. It is the schematic showing an example of a structure of the pixel circuit in a display area. It is the schematic showing an example of a structure of the pixel circuit in a non-display area | region. FIG. 2 is a top view illustrating an example of a configuration of the display panel in FIG. 1. It is the schematic showing an example of a structure of a power supply line drive circuit. It is the schematic showing an example of a structure of a power supply voltage adjustment circuit. FIG. 6 is a relationship diagram illustrating an example of a relationship between a saturation region of a driving transistor and a gradation. It is a schematic diagram showing an example of the gradation in a display screen, and an example of the video signal in 1 field period. It is a relationship figure showing an example of the relationship between a power supply voltage, the voltage of an organic EL element, and the drain-source voltage of a drive transistor. It is a relationship figure showing an example of the relationship between panel temperature and the voltage of an organic EL element. It is a relationship figure showing an example of the relationship between the energization time of an organic EL element, and the voltage fluctuation amount of an organic EL element. It is the schematic showing the other example of a structure of the display apparatus of FIG. It is the schematic showing an example of a structure of the power supply voltage adjustment circuit of FIG. It is the schematic showing an example of a structure of the pixel circuit in the non-display area | region of FIG. It is the schematic showing the other example of a structure of the display apparatus of FIG. It is the schematic showing the other example of a structure of the display apparatus of FIG. FIG. 17 is a schematic diagram illustrating an example of a configuration of a power supply line driving circuit in FIGS. 15 and 16. It is a perspective view showing the external appearance of the application example 1 of the light-emitting device of the said embodiment. (A) is a perspective view showing the external appearance seen from the front side of the application example 2, (B) is a perspective view showing the external appearance seen from the back side. 12 is a perspective view illustrating an appearance of application example 3. FIG. 14 is a perspective view illustrating an appearance of application example 4. FIG. (A) is a front view of the application example 5 in an open state, (B) is a side view thereof, (C) is a front view in a closed state, (D) is a left side view, and (E) is a right side view, (F) is a top view and (G) is a bottom view.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the invention will be described in detail with reference to the drawings. The description will be given in the following order.

1. Embodiment (FIGS. 1 to 11)
2. Modification (FIGS. 12 to 17)
3. Application examples (FIGS. 18 to 22)

<Embodiment>
(Schematic configuration of the display device 1)
FIG. 1 shows a schematic configuration of a display device 1 according to an embodiment of the present invention. The display device 1 includes a display panel 10 (display unit) and a drive circuit 20 (drive unit) that drives the display panel 10.

  The display panel 10 has a display area 10A in which three types of organic EL elements 11R, 11G, and 11B having different emission colors are two-dimensionally arranged. The organic EL element 11R is an organic EL element that emits red light, the organic EL element 11G is an organic EL element that emits green light, and the organic EL element 11B is an organic EL element that emits blue light. Hereinafter, the organic EL element 11 is appropriately used as a general term for the organic EL elements 11R, 11G, and 11B. The display panel 10 also has a non-display area 10B in which three types of organic EL elements 12R, 12G, and 12B (light emitting elements) having different emission colors are arranged. The organic EL element 12R is an organic EL element that emits red light, the organic EL element 12G is an organic EL element that emits green light, and the organic EL element 12B is an organic EL element that emits blue light. Hereinafter, the organic EL element 12 is appropriately used as a general term for the organic EL elements 12R, 12G, and 12B. Thus, the non-display area 10B is provided with the organic EL element 12 that emits the same type of color light as the organic EL element 11 provided in the display area 10A. The organic EL element 12 is preferably composed of the same structure and material as the organic EL element 11.

  The drive circuit 20 includes a timing generation circuit 21, a video signal processing circuit 22, a signal line drive circuit 23, a write line drive circuit 24, a power supply line drive circuit 25, and a power supply voltage adjustment circuit 26.

(Display pixel 15)
FIG. 2 shows an example of a circuit configuration in the display area 10A. In the display area 10 </ b> A, a plurality of pixel circuits 13 are two-dimensionally arranged in pairs with the individual organic EL elements 11. In the present embodiment, the pair of organic EL elements 11 and the pixel circuit 13 constitute one subpixel 14. More specifically, as shown in FIG. 1, the pair of organic EL elements 11R and the pixel circuit 13 constitute one subpixel 14R, and the pair of organic EL elements 11G and the pixel circuit 13 constitute one subpixel 14G. The pair of organic EL elements 11B and the pixel circuit 13 constitute one subpixel 14B. Furthermore, three subpixels 14R, 14G, and 14B adjacent to each other constitute one pixel (display pixel 15).

Each pixel circuit 13 includes, for example, a drive transistor Tr ₁ , a write transistor Tr _2, and a storage capacitor C _s1 , and has a circuit configuration of 2Tr1C. The drive transistor Tr ₁ and the write transistor Tr ₂ are formed by, for example, n-channel MOS type thin film transistors (TFTs). The drive transistor Tr ₁ or the write transistor Tr ₂ may be, for example, a p-channel MOS type TFT.

In display area 10A, a plurality of signal lines DTL are arranged in the column direction, and a plurality of write lines WSL and power supply lines PSL (members to which power supply voltage is supplied) are arranged in the row direction. One organic EL element 11 is provided near the intersection of each signal line DTL and each write line WSL. Each signal line DTL is connected to the output end (not shown) of the signal line drive circuit 23 and one of the drain electrode and the source electrode (not shown) of the write transistor Tr ₂ . Kakushokomisen WSL has an output terminal of the write line drive circuit 24 (not shown) is connected to the gate electrode of the writing transistor Tr ₂ (not shown). Each power supply line PSL is connected to the output end (not shown) of the power supply line drive circuit 25 and _one of the drain electrode and the source electrode (not shown) of the drive transistor Tr1. Of the drain electrode and the source electrode of the write transistor Tr ₂ , the one not connected to the signal line DTL (not shown) is connected to the gate electrode (not shown) of the drive transistor Tr ₁ and one end of the storage capacitor C _s1. ing. Of the drain electrode and the source electrode of the drive transistor Tr ₁ , the one not connected to the power supply line PSL (not shown) and the other end of the storage capacitor C _s1 are connected to the anode electrode (not shown) of the organic EL element 11. Has been. A cathode electrode (not shown) of the organic EL element 11 is connected to the ground line GND, for example.

(Adjustment pixel 18)
FIG. 3 illustrates an example of a circuit configuration in the non-display area 10B. Three pixel circuits 16 are arranged in pairs with the individual organic EL elements 12 in the non-display area 10B. In the present embodiment, the pair of organic EL elements 12 and the pixel circuit 16 constitute one subpixel 17. More specifically, as shown in FIG. 1, the pair of organic EL elements 12R and the pixel circuit 13 constitute one subpixel 17R, and the pair of organic EL elements 12G and the pixel circuit 13 constitute one subpixel 17G. The pair of organic EL elements 12B and the pixel circuit 13 constitute one subpixel 17B. Further, three subpixels 17R, 17G, and 17B adjacent to each other constitute one pixel (adjustment pixel 18).

The pixel circuit 16 has the same configuration as the pixel circuit 13 described above. Specifically, the pixel circuit 16 includes a drive transistor Tr ₃ , a write transistor Tr _4, and a storage capacitor C _s2 , and has a circuit configuration of 2Tr1C. The drive transistor Tr ₃ and the write transistor Tr ₄ are formed by, for example, an n-channel MOS type TFT. The drive transistor Tr ₃ or the write transistor Tr ₄ may be, for example, a p-channel MOS type TFT.

In the non-display area 10B, one signal line DTL is arranged in the column direction, and one write line WSL and one power supply line PSL are arranged in the row direction. An organic EL element 12 is provided in the vicinity of the intersection of the signal line DTL and the write line WSL. The signal line DTL is connected to the output end (not shown) of the signal line drive circuit 23 and one of the drain electrode and the source electrode (not shown) of the write transistor Tr ₄ . The write line WSL is connected to the output end (not shown) of the write line drive circuit 24 and the gate electrode (not shown) of the write transistor Tr ₄ . Each power supply line PSL is connected to the output end (not shown) of the power supply line drive circuit 25 and one of the drain electrode and the source electrode (not shown) of the drive transistor Tr ₃ . Of the drain electrode and the source electrode of the write transistor Tr ₄ , the one not connected to the signal line DTL (not shown) is connected to the gate electrode (not shown) of the drive transistor Tr ₃ and one end of the storage capacitor C _s2. ing. Of the drain electrode and the source electrode of the driving transistor Tr ₃ , the one not connected to the power supply line PSL (not shown) and the other end of the storage capacitor C _s2 are connected to the anode electrode (not shown) of the organic EL element 12. Has been. A cathode electrode (not shown) of the organic EL element 12 is connected to the ground line GND, for example. One end of an anode signal line ASL is connected to the anode electrode of the organic EL element 12. The other end of the anode signal line ASL is connected to the power supply voltage adjustment circuit 26.

Incidentally, it called an anode signal line ASL, which are connected to the sub-pixels 17R and the anode signal lines ASL _1, an anode signal connected to the subpixel 17B referred to anode signal line ASL, which are connected to the sub-pixel 17G and the anode signal line ASL ₂ The line ASL is referred to as an anode signal line ASL ₃ . The anode signal line ASL is appropriately used as a general term for these three anode signal lines ASL ₁ , ASL ₂ , and ASL ₃ .

(Top panel configuration of display panel 10)
FIG. 4 illustrates an example of a top surface configuration of the display panel 10. The display panel 10 has a structure in which, for example, the drive panel 30 and the sealing panel 40 are bonded together via a sealing layer (not shown).

  Although not shown in FIG. 4, the drive panel 30 includes a plurality of organic EL elements 11 that are two-dimensionally arranged in the display region 10 </ b> A, and a plurality of pixel circuits 13 that are arranged adjacent to each organic EL element 11. have. Although not shown in FIG. 4, the driving panel 30 includes three organic EL elements 12 that are two-dimensionally arranged in the non-display area 10 </ b> B and three pixels that are arranged adjacent to each organic EL element 12. Circuit 16.

  For example, as shown in FIG. 4, a plurality of video signal supply TABs 51 and an anode signal output TCP 54 are attached to one side (long side) of the drive panel 30. For example, a scanning signal supply TAB 52 is attached to the other side (short side) of the drive panel 30. Further, for example, a power supply voltage supply TAB 53 is attached to a short side of the drive panel 30 and a side different from the scanning signal supply TAB 52. The video signal supply TAB 51 is obtained by hollow-wiring an IC in which the signal line driving circuit 23 is integrated into an opening of a film-like wiring board. The scanning signal supply TAB 52 is obtained by hollow wiring an IC in which the writing line driving circuit 24 is integrated in an opening of a film-like wiring board. The power supply voltage supply TAB 53 is an IC in which the power supply line driving circuit 25 is integrated and is hollowly wired in the opening of a film-like wiring board. The power supply voltage supply TAB 53 is connected to the output terminal (not shown) of the power supply voltage adjustment circuit 26. The anode signal output TCP 54 is connected to an input terminal (not shown) of the power supply voltage adjustment circuit 26. Note that the signal line drive circuit 23, the write line drive circuit 24, and the power supply line drive circuit 25 do not have to be formed in the TAB, and may be formed in the drive panel 30, for example.

  The sealing panel 40 includes, for example, a sealing substrate (not shown) that seals the organic EL elements 11 and 12 and a color filter (not shown). For example, the color filter is provided in a region of the surface of the sealing substrate through which light from the organic EL element 11 passes. The color filter has, for example, a red filter, a green filter, and a blue filter (not shown) corresponding to each of the organic EL elements 11R, 11G, and 11B.

(Drive circuit 20)
Next, each circuit in the drive circuit 20 will be described with reference to FIG. The timing generation circuit 21 controls the video signal processing circuit 22, the signal line drive circuit 23, the write line drive circuit 24, the power supply line drive circuit 25, and the power supply voltage adjustment circuit 26 to operate in conjunction with each other.

  The timing generation circuit 21 outputs a control signal 21A to each circuit described above, for example, in response to (in synchronization with) the synchronization signal 20B input from the outside. The timing generation circuit 21 is formed, for example, on a control circuit board (not shown) separate from the display panel 10 together with the video signal processing circuit 22 and the power supply voltage adjustment circuit 26, for example.

  For example, the video signal processing circuit 22 corrects the digital video signal 20A input from the outside according to the synchronization signal 20B input from the outside (synchronously), and converts the corrected video signal to analog. The signal is converted and output to the signal line drive circuit 23 as an analog video signal 22A.

  The video signal processing circuit 22 extracts a video signal having the maximum luminance from the video signal 20A of one field (or the corrected video signal), and uses the extracted video signal as a video signal for the adjustment pixel 18. The signal is output to the signal line drive circuit 23. For example, the video signal processing circuit 22 extracts the video signal 20A having the maximum luminance from the video signal 20A in one field every horizontal period. The video signal processing circuit 22 extracts a video signal having the maximum luminance for each emission color.

  Specifically, the video signal processing circuit 22 extracts and extracts a video signal (maximum red video signal) having the maximum luminance from the red video signal 20A (or the corrected video signal) of one field. The video signal is output to the signal line drive circuit 23 as a video signal for the subpixel 17R. In addition, the video signal processing circuit 22 extracts a video signal (maximum green video signal) having the maximum luminance from the green video signal 20A (or the corrected video signal) of one field, and the extracted video signal A video signal for the sub-pixel 17G is output to the signal line driving circuit 23. Further, the video signal processing circuit 22 extracts a video signal (maximum blue video signal) having the maximum luminance from the blue video signal 20A (or the corrected video signal) of one field, and the extracted video signal is extracted. The video signal for the subpixel 17B is output to the signal line drive circuit 23.

The signal line drive circuit 23 outputs the analog video signal 22A input from the video signal processing circuit 22 to each signal line DTL in response to (in synchronization with) the input of the control signal 21A. The signal line drive circuit 23 outputs a video signal 22A corrected by the video signal processing circuit 22 to the signal line DTL corresponding to the display pixel 15. The signal line drive circuit 23 outputs the video signal 22A having the maximum luminance extracted by the video signal processing circuit 22 to the signal line DTL corresponding to the adjustment pixel 18. Specifically, the signal line drive circuit 23 outputs the maximum red video signal as the video signal 22A to the signal line DTL corresponding to the subpixel 17R. Further, the signal line driving circuit 23 outputs a maximum green video signal as the video signal 22A to the signal line DTL corresponding to the sub-pixel 17G. The signal line driving circuit 23 outputs a maximum blue video signal as the video signal 22A to the signal line DTL corresponding to the sub-pixel 17B. That is, the signal line drive circuit 23 writes the analog video signal 22A (signal voltage) to the gates of the drive transistor Tr ₁ in each display pixel 15 and the drive transistor Tr ₃ in the adjustment pixel 18. . For example, as shown in FIG. 4, the signal line driving circuit 23 is provided in a video signal supply TAB 51 attached to one side (long side) of the driving panel 30.

  The write line drive circuit 24 sequentially selects one write line WSL from the plurality of write lines WSL in response to (in synchronization with) the input of the control signal 21A. The write line driving circuit 24 is provided in a scanning signal supply TAB 52 attached to the other side (short side) of the driving panel 30 as shown in FIG.

Power line drive circuit 25 in response to input of the control signal 21A (in synchronization with) a plurality of the power supply line PSL, power supply voltage corresponding to the value of the power supply voltage V _cc which is output from the power supply voltage regulator circuit 26 Are sequentially applied to control light emission and quenching of the organic EL elements 11 and 12.

For example, as shown in FIG. 5, the power supply line drive circuit 25 is used for switching between the power supply voltage propagation line PDL provided for each power supply line PSL and the ground line GND in series. Transistors Tr ₅ and Tr ₆ . Transistor Tr ₅ and provided with power line PSL is connected to a connection point of the transistor Tr _6, both the gate of the transistor Tr _5, Tr ₆ are connected to the control line CNL. A control signal for applying the power supply voltage _Vcc to the power supply line PSL for a desired period is input to the control line CNL.

  The power supply voltage adjustment circuit 26 generates a power supply voltage having a value corresponding to the voltage variation of the three organic EL elements 12 included in the adjustment pixel 18 in response to (in synchronization with) the input of the control signal 21A. . For example, as illustrated in FIG. 6, the power supply voltage adjustment circuit 26 includes three ADCs (Analog Digital Converters) 31, a storage unit 32, a comparison unit 33, and a voltage generation unit 34.

The input end (not shown) of each ADC 31 is connected to the anode signal line ASL as shown in FIGS. Specifically, the input end of the first ADC 31 is connected to the anode signal line ASL ₁ connected to the subpixel 17R. The input end of the second ADC 31 is connected to the anode signal line ASL ₂ connected to the subpixel 17G. The input end of the third ADC 31 is connected to the anode signal line ASL ₃ connected to the subpixel 17B. The output end (not shown) of each ADC 31 and the output end (not shown) of the storage unit 32 are connected to the input end (not shown) of the comparison unit 33. An output end (not shown) of the comparison unit 33 is connected to an input end (not shown) of the voltage generation unit 34, and an output end (not shown) of the voltage generation unit 34 is connected to the power supply voltage propagation line PDL. Has been.

Each ADC 31 converts an input analog signal (anode voltage V _el (V _el (R), V _el (G), V _el (B))) into a digital signal. The storage unit 32 stores an initial voltage V _ini (V _ini (R), V _ini (G), V _ini (B)) (reference voltage) of the organic EL element 12 (12R, 12G, 12B). The comparison unit 33 receives the digital signal (anode voltage V _el (V _el (R), V _el (G), V _el (B))) input from each ADC 31 and the initial voltage V read from the storage unit 32. By comparing _ini (V _ini (R), V _ini (G), V _ini (B)), the voltage fluctuation amount ΔV (ΔV _R , ΔV _G , of the organic EL element 12 (12R, 12G, 12B) ΔV _B ) is derived.

Specifically, comparator 33, by taking the difference of the anode voltage V _el (R) and the initial voltage V _ini (R), the voltage variation of the anode voltage _{V el (R) ΔV R (} = V _el (R) −V _ini (R)) is derived. Further, the comparison unit 33 _obtains a difference between the anode voltage V _el (G) and the initial voltage V _ini (G), thereby _obtaining a voltage fluctuation amount ΔV _G (= V _el (V) of the anode voltage V _el (G). G) −V _ini (G)) is derived. Further, the comparison unit 33 _obtains a difference between the anode voltage V _el (B) and the initial voltage V _ini (B), thereby _obtaining a voltage fluctuation amount ΔV _B (= V _el (B) of the anode voltage V _el (B). B) -V _ini (B)) is derived.

The voltage generator 34 derives a power supply voltage value to be applied to each display pixel 15 using the voltage fluctuation amount ΔV (ΔV _R , ΔV _G , ΔV _B ), and the power supply voltage V _cc (V _{cc of the} derived power supply voltage value). (R), V _cc (G), V _cc (B)), the largest voltage V _cc is applied to each display pixel 15 (each power supply voltage propagation line PDL). Specifically, the voltage generator 34 uses the voltage fluctuation amount ΔV (ΔV _R , ΔV _G , ΔV _B ) to derive a power supply voltage value necessary for driving the drive transistor Tr ₁ in the saturation region, the largest voltage V _cc of the power supply voltage V _cc of the derived power supply voltage value, so as to apply to each display pixel 15 (the power supply voltage propagating line PDL). The voltage generation unit 34 derives a power supply voltage value to be applied to the adjustment pixel 18 using the voltage fluctuation amount ΔV (ΔV _R , ΔV _G , ΔV _B ), and obtains the power supply voltage V _cc of the derived power supply voltage value. The adjustment pixel 18 (power supply voltage propagation line PDL) may be applied.

Here, the saturation region is, for example, as shown in FIG. 7, the current I _ds flowing through the organic EL element 11 is constant regardless of the value of the drain-source voltage V _ds of the drive transistor Tr ₁ . Point to the area. In the saturation region, the current I _ds need not be completely constant regardless of the value of the drain-source voltage V _ds of the drive transistor Tr ₁ . Saturation region, the current I _ds is the drain of the drive transistor Tr ₁ - rate of change of the current I _ds as compared with the linear region vary greatly depending on the value of the source voltage V _ds contains also gentle region.

(Operation of display device 1)
Next, an example of operation | movement of the display apparatus 1 of this Embodiment is demonstrated. First, the video signal 20 </ b> A and the synchronization signal 20 </ b> B are input to the display device 1 from the outside. Then, the control signal 21A is output from the timing generation circuit 21 to each circuit in the drive circuit 20, and each circuit in the drive circuit 20 operates according to the instruction of the control signal 21A. Specifically, a video signal 22A is generated in the video signal processing circuit 22, and the generated video signal 22A is output to each signal line DTL by the signal line driving circuit 23, and at the same time, a plurality of signals are written by the writing line driving circuit 24. One write line WSL is sequentially selected from the write lines WSL. Further, the video signal processing circuit 22 generates a video signal for the adjustment pixel 18 and outputs the generated video signal for the adjustment pixel 18 to the signal line DTL for the adjustment pixel 18 at the same time as writing. The line drive circuit 24 selects the write line WSL for the adjustment pixel 18. A power supply voltage having a value corresponding to the voltage fluctuation of the organic EL element 12 included in the adjustment pixel 18 is output from the power supply voltage adjustment circuit 26 to the power supply voltage propagation line PDL, and the power supply voltage output to the power supply voltage propagation line PDL is the power supply. The voltage is sequentially applied to the plurality of power supply lines PSL by the line driving circuit 25. Thereby, each display pixel 15 and the adjustment pixel 18 are driven, and an image is displayed in the display area 10A.

(Effect of display device 1)
Next, effects of the display device 1 according to the present embodiment will be described. As shown in FIG. 7, the lower end of the saturation region differs for each gradation, and the lower the gradation, the lower the saturation region, the lower the drain-source voltage V _{ds of} the drive transistor Tr _1. Displace towards. Therefore, if the initial IV characteristic of the organic EL element 11 is the curve A in the figure, the higher the gradation, the closer the operating point (black circle) is to the lower end of the saturation region, The higher the gradation, the smaller the margin between the operating point (black circle) and the lower end of the saturation region. Accordingly, when the IV characteristic of the organic EL element 11 is displaced, if the IV characteristic after the displacement becomes the curve B in the figure, the operating point is still saturated at the intermediate gradation and the low gradation. Although it is in the region, the operating point enters the linear region at high gradation.

At this time, the voltage generator 34 is set so that the operating point enters the linear region at a high gradation regardless of the value of the video signal 22A (one-field video signal) applied to each display pixel 15 after one horizontal period. _{Suppose that} the value of the power supply voltage _Vcc is set. When the video signal 22A (one-field video signal) applied to each display pixel 15 after one horizontal period includes a value corresponding to a high gradation (see, for example, FIG. 8A), all the driving transistor Tr ₁ becomes possible to drive in a saturation region in the display pixel 15. On the other hand, when the video signal 22A (one-field video signal) applied to each display pixel 15 after one horizontal period does not include a value corresponding to a high gradation (for example, see FIGS. 8B and 8C). ), It is possible to drive the drive transistor Tr ₁ in the saturation region in all the display pixels 15. However, as shown in FIG. 7, in the intermediate gradation and the low gradation, the operating point is considerably separated from the lower end of the saturation region (V _ds = V _gs −V _th ), and accordingly, the power supply voltage V The value of _cc is excessively large. That is, in this case, it can be said that the power consumption is excessively large.

Meanwhile, in the present embodiment, the voltage generator 34, the drive transistor Tr ₁ included in each display pixel 15, the value of the required power supply voltage V _cc to the operating point is always the saturation region (or, operation The minimum power supply voltage V _cc necessary for the point to always be within the saturation region is set. Further, the voltage generating unit 34, the value of the required power supply voltage V _cc to the operating point is always a saturation region (or the minimum required for the operating point is always the saturation region _the power supply voltage V _cc Is determined for each emission color, and the largest value among them is set as the latest power supply voltage _Vcc .

For example, the drive transistor Tr in the sub-pixel 14R to which the video signal (maximum red video signal) having the maximum luminance is applied in the video signal 22A (one-field video signal) applied to each sub-pixel 14R after one horizontal period. _{In 1} , the value of the power supply voltage V _cc (R) is obtained so that the operating point is the lower end of the saturation region. That is, the organic EL element in the sub-pixel 14R to which the video signal (maximum red video signal) having the maximum luminance is applied in the video signal 22A (one-field video signal) applied to each sub-pixel 14R after one horizontal period. The value of the power supply voltage V _cc (R) is obtained by taking the sum (V _el + V _ds ) of the anode voltage V _el of 11 and the drain-source voltage V _ds of the drive transistor Tr ₁ .

Further, the drive transistor Tr in the sub-pixel 14G to which the video signal (maximum green video signal) having the maximum luminance is applied in the video signal 22A (one-field video signal) applied to each sub-pixel 14G after one horizontal period. _{In 1} , the value of the power supply voltage V _cc (G) is obtained so that the operating point becomes the lower end of the saturation region. That is, the organic EL element in the sub-pixel 14G to which the video signal (maximum green video signal) having the maximum luminance in the video signal 22A (one-field video signal) applied to each sub-pixel 14G after one horizontal period is applied. The value of the power supply voltage V _cc (G) is obtained by taking the sum (V _el + V _ds ) of the anode voltage V _el of 11 and the drain-source voltage V _ds of the drive transistor Tr ₁ .

Further, the drive transistor Tr in the sub-pixel 14B to which the video signal (maximum blue video signal) having the maximum luminance is applied in the video signal 22A (one-field video signal) applied to each sub-pixel 14B after one horizontal period. _{In 1} , the value of the power supply voltage V _cc (B) is obtained so that the operating point becomes the lower end of the saturation region. That is, the organic EL element in the sub-pixel 14B to which the video signal (maximum blue video signal) having the maximum luminance is applied in the video signal 22A (one-field video signal) applied to each sub-pixel 14B after one horizontal period. The value of the power supply voltage V _cc (B) is obtained by taking the sum (V _el + V _ds ) of the anode voltage V _el of 11 and the drain-source voltage V _ds of the drive transistor Tr ₁ .

Thereafter, the largest value among the power supply voltages V _cc (R), V _cc (G), and V _cc (B) is set as the latest power supply voltage V _cc .

Actually, the latest power supply voltage _Vcc is set as follows. For example, firstly, the power supply voltage V _cc of the sub-pixels 14R set initially _{(R0) (= V el (} R0) + V ds (0)), by applying a voltage variation [Delta] V (R), _the power supply voltage V _cc (R) (= V _cc (R0) + ΔV (R)) is derived. Similarly, the power supply voltage V _cc of the sub-pixel 14G which is initially set _{(G0) (= V el (} G0) + V ds (0)), by applying a voltage variation [Delta] V (G), _the power supply voltage V _cc (G) (= V _cc (G0) + ΔV (G)) is derived. By adding the voltage fluctuation amount ΔV (B) to the power supply voltage V _cc (B0) (= V _el (B0) + V _ds (0)) of the sub-pixel 14B set at the initial stage, the power supply voltage V _cc (B) ( = V _cc (B0) + ΔV (B)) is derived. Thereafter, the largest value among the power supply voltages V _cc (R), V _cc (G), and V _cc (B) is set as the latest power supply voltage V _cc .

Note that V _el (R0) is the initial voltage V _el of the organic EL element 11R, V _el (G0) is the initial voltage V _el of the organic EL element 11G, and V _el (B0) is organic This is the initial voltage V _el of the EL element 11B. V _ds (0) is the initial drain-source voltage V _ds of the drive transistor Tr ₁ .

For example, as shown in FIG. 9, at the initial stage, the anode voltage V _el (= V _el (R0)) of the organic EL element 11R is 6 V, and the drain-source voltage V _ds (= V _ds ) of the drive transistor Tr _1. (0)) is 3V, and the power supply voltage V _cc (= V _cc (R0)) is 9V. Thereafter, it is assumed that the IV characteristic of the organic EL element 11R changes and the anode voltage V _el of the organic EL element 11R becomes 7V. At this time, in the present embodiment, for example, ΔV (R) is not set to a value (for example, 3V) when the operating point is the lower end of the saturation region at the maximum gradation, and each subpixel after one horizontal period. In the driving transistor Tr ₁ in the sub-pixel 14R to which the video signal (maximum red video signal) having the maximum luminance in the video signal 22A (one-field video signal) applied to 14R is applied, the operating point is in the saturation region. The value of ΔV (R) is set so as to be the lower end. For example, the value (for example, 1V) of the voltage fluctuation amount ΔV (R) obtained when the maximum red video signal is output to the signal line DTL corresponding to the subpixel 17R is set as the value of ΔV (R). The Thereafter, ΔV (R) is added to V _cc (R0), and 10V is set to a new value of the power supply voltage V _cc . Thus, in the present embodiment, the power supply voltage in the intermediate gradation and the low gradation is lower than in the case where the value of the power supply voltage _Vcc is set so that the operating point is at the lower end of the saturation region at the maximum gradation. The value of _Vcc can be reduced. Accordingly, the power consumption can be suppressed at the intermediate gradation and the low gradation.

  By the way, as shown in FIG. 7, when the IV characteristic of the organic EL element 11 is displaced, the IV characteristic after the displacement becomes a curve B in the figure. For example, the panel temperature is low. This is when the current is applied to the organic EL element 11 (see FIG. 11). Therefore, the driving method according to the present embodiment is particularly effective when the panel temperature is low or when the energization time of the organic EL element 11 is long.

<Modification>
In the above embodiment, one anode line ASL is connected to each sub-pixel 17 and one ADC 31 is connected to each anode line ASL. That is, in the above embodiment, three anode lines ASL are provided. However, the number of anode lines ASL is not limited thereto. For example, the number of anode lines ASL may be one. The connection mode between the sub-pixel 17 and the ADC 31 at this time is, for example, as shown in FIG. That is, one end of the anode line ASL is branched into three, and each branch on one end side of the anode line ASL is connected to the anode of the subpixel 17 one by one. Further, the other end of the anode line ASL is connected to the power supply voltage adjustment circuit 26. As a result, for example, as shown in FIG. 13, the number of ADCs 31 in the power supply voltage adjustment circuit 26 can be reduced to one like the number of anode lines ASL, so that the component cost can be reduced.

However, in this case, in order to be able to detect the anode voltage V _el of each subpixel 17 by one ADC 31, for example, as shown in FIG. In addition, a switching transistor Tr ₅ is preferably provided. Each transistor Tr ₅ is ON / OFF controlled by a control signal from the timing generation circuit 21 via a control line CNL 2 connected to the gate of the transistor Tr ₅ . Each transistor Tr ₅ is preferably turned on and off sequentially.

In the above embodiment, each sub-pixel 14 included in one display pixel 15 is connected to a common power supply line PSL. However, for example, as shown in FIGS. One PSL (PSL (R), PSL (G), PSL (B)) may be connected one by one. In such a case, when the voltage generator 34 derives the power supply voltage value to be applied to each display pixel 15 using the voltage fluctuation amount ΔV (ΔV _R , ΔV _G , ΔV _B ), the derived power supply voltage value is obtained. All of the power supply voltages V _cc (V _cc (R), V _cc (G), V _cc (B)) may be output to the power line driver circuit 25. At this time, for example, as shown in FIG. 17, the power supply voltage V _cc (R) is input to the power supply line drive circuit 25 via the power supply voltage propagation line PDL (R). Similarly, the power supply voltage V _cc (G) is input to the power supply line drive circuit 25 via the power supply voltage propagation line PDL (G), and the power supply voltage V _cc (B) is supplied via the power supply voltage propagation line PDL (B). The power is input to the power line drive circuit 25.

For example, as shown in FIG. 17, the power supply line drive circuit 25 is provided with switching transistors Tr ₅ and Tr ₆ for each of the power supply voltage propagation lines PDL (R), PDL (G), and PDL (B). ing. Further, the power supply line PSL for each transistor _{Tr 5, Tr 6 (PSL (} R), PSL (G), PSL (B)) are connected, a common control line to the gate of each transistor Tr _5, Tr ₆ CNL1 Is connected. Thereby, the power supply line drive circuit 25 can apply the power supply voltage V _cc (R) to the subpixel 14R. Similarly, the power supply line driving circuit 25 can apply the power supply voltage V _cc (G) to the subpixel 14G, and can apply the power supply voltage _Vcc (B) to the subpixel 14B. As a result, the power consumption can be further reduced as compared with the above embodiment.

  In the above embodiment, only one adjustment pixel 18 is provided, but a plurality of adjustment pixels 18 may be provided. Further, although the adjustment pixel 18 is provided in the non-display area 10B, it may be provided in the display area 10A. At this time, the adjustment pixel 18 may be one display pixel 15 or the sub-pixel 14 in the display region 10A.

  Further, in the above embodiment, the case where the plurality of power supply lines PSL are provided electrically separated from each other and the plurality of power supply lines PSL are sequentially scanned by the power supply line driving circuit 25 is illustrated. A fixed voltage may be applied to all power supply lines PSL. In this case, the output terminal of the power supply voltage adjustment circuit 26 may be directly connected to each power supply line PSL. However, in that case, the output terminal of the power supply line driving circuit 25 may be separated from each power supply line PSL, and the internal configuration of the pixel circuits 13 and 16 may be different from that illustrated above.

Moreover, in the said embodiment, although the power supply voltage _Vcc was adjusted, the cathode voltage of the organic EL element 11 may be adjusted.

<Application example>
Hereinafter, application examples of the display device 1 described in the above embodiment and the modifications thereof will be described. The display device 1 according to the above-described embodiment or the like receives a video signal input from the outside or a video signal generated inside, such as a television device, a digital camera, a notebook personal computer, a mobile terminal device such as a mobile phone, or a video camera. The present invention can be applied to display devices of electronic devices in various fields that display as images or videos.

(Application example 1)
FIG. 18 illustrates an appearance of a television device to which the display device 1 of the above embodiment is applied. This television apparatus has, for example, a video display screen unit 300 including a front panel 310 and a filter glass 320, and the video display screen unit 300 is configured by the display device 1 according to the above-described embodiment or the like. .

(Application example 2)
FIG. 19 illustrates an appearance of a digital camera to which the display device 1 according to the above-described embodiment or the like is applied. The digital camera includes, for example, a flash light emitting unit 410, a display unit 420, a menu switch 430, and a shutter button 440. The display unit 420 is configured by the display device 1 according to the above-described embodiment or the like. Yes.

(Application example 3)
FIG. 20 illustrates an appearance of a notebook personal computer to which the display device 1 according to the above-described embodiment or the like is applied. The notebook personal computer includes, for example, a main body 510, a keyboard 520 for inputting characters and the like, and a display unit 530 for displaying an image. The display unit 530 is a display device such as the above-described embodiment. 1.

(Application example 4)
FIG. 21 illustrates an appearance of a video camera to which the display device 1 according to the above-described embodiment or the like is applied. The video camera has, for example, a main body 610, a subject shooting lens 620 provided on the front side surface of the main body 610, a start / stop switch 630 at the time of shooting, and a display 640. Reference numeral 640 denotes the display device 1 according to the above-described embodiment or the like.

(Application example 5)
FIG. 22 illustrates an appearance of a mobile phone to which the display device 1 according to the above-described embodiment and the like is applied. For example, the mobile phone is obtained by connecting an upper housing 710 and a lower housing 720 with a connecting portion (hinge portion) 730, and includes a display 740, a sub-display 750, a picture light 760, and a camera 770. Yes. The display 740 or the sub-display 750 is configured by the display device 1 according to the above-described embodiment or the like.

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 10 ... Display panel, 10A ... Display area, 10B ... Non-display area | region, 11, 11R, 11G, 11B, 12, 12R, 12G, 12B ... Organic EL element, 13, 16 ... Pixel circuit, 14, 14R, 14G, 14B, 17, 17R, 17G, 17B ... sub-pixel, 15 ... display pixel, 18 ... adjustment pixel, 20 ... drive circuit, 20A, 22A ... video signal, 20B ... synchronization signal, 21 ... timing generation circuit , 21A ... control signal, 22 ... video signal processing circuit, 23 ... signal line drive circuit, 24 ... write line drive circuit, 25 ... power supply line drive circuit, 26 ... power supply voltage adjustment circuit, 30 ... drive panel, 31 ... ADC , 32 ... storage unit, 33 ... comparison unit, 34 ... voltage generation unit, 40 ... sealing panel, 51 ... video signal supply TAB, 52 ... scanning signal supply TAB, 53 ... power supply voltage supply TAB, 4 ... anode signal output TCP, 300 ... video display screen, 310 ... front panel, 320 ... filter glass, 410 ... light emitting part, 420, 530, 640 ... display, 430 ... menu switch, 440 ... shutter button, 510 ... 520 ... Keyboard, 610 ... Main body, 620 ... Lens, 630 ... Start / Stop switch, 710 ... Upper housing, 720 ... Lower housing, 730 ... Connecting portion, 740 ... Display, 750 ... Sub-display, 760 ... Picture light, 770 ... Camera, A, B ... Curve, ASL ... Anode signal line, _Cs1 , _Cs2 ... Retention capacitor, CNL ... Control line, DTL ... Signal line, GND ... Ground line, _Ids ... Current, PDL ... power supply voltage propagating line, PSL ... power supply line, Tr _1, Tr ₃ ... driving transistor, Tr _2, Tr ₄ ... Can lump transistor, Tr _5, Tr ₆ ... _{transistor, V cc, V cc (R0} ) ... the power supply _{voltage, V ds, V ds (0} ) ... drain - source _{voltage, V el, V el (R0} ) ... voltage, V _ini ... initial voltage, WSL ... write line, ΔV ... voltage fluctuation amount.

Claims (11)

A display section having a display area in which a plurality of types of display pixels having different emission colors are arranged, and a non-display area in which a plurality of types of adjustment pixels emitting the same type of color light as the emission colors of the display pixels are arranged ,
A drive unit that drives each display pixel based on a video signal,
The adjustment pixel includes a light emitting element,
The driving unit derives a power supply voltage having a value corresponding to a voltage variation of a light emitting element included in the plurality of types of adjustment pixels for each emission color, and the derived power supply voltage for each emission color is displayed on the plurality of types of display. A display device that applies to at least each display pixel among the pixels and the plurality of types of adjustment pixels in correspondence with each emission color. The drive unit derives a maximum video signal, which is a video signal having the maximum luminance among video signals in one field, for each emission color, and drives the adjustment pixel based on the derived maximum video signal for each emission color. The display device according to claim 1. The driving unit derives a maximum video signal, which is a video signal having the maximum luminance among video signals of one field, for each emission color for each horizontal period, and based on the derived maximum video signal for each emission color. The display device according to claim 2, wherein the adjustment pixel is driven. The driving unit derives a voltage fluctuation amount of the light emitting element included in the adjustment pixel for each emission color by comparing the voltage of the light emitting element included in the adjustment pixel with a reference voltage, and the voltage The power supply voltage having a value corresponding to the amount of variation is applied to at least each display pixel among the plurality of types of display pixels and the plurality of types of adjustment pixels in correspondence with each emission color. The display device according to any one of the above. The adjustment pixel includes a first transistor that controls a current flowing through the light emitting element, and a second transistor that writes a signal voltage corresponding to the video signal to a gate of the first transistor,
The drive unit derives a power supply voltage value necessary for driving the first transistor in a saturation region using the voltage fluctuation amount, and uses the derived power supply voltage value as the plurality of types of display pixels. The display device according to claim 4, wherein the display device is applied to at least each display pixel among the plurality of types of adjustment pixels corresponding to each emission color. The adjustment pixel includes a first transistor that controls a current flowing through the light emitting element, and a second transistor that writes a signal voltage corresponding to the video signal to a gate of the first transistor,
One of the source and the drain of the first transistor is connected to the light emitting element,
4. The display device according to claim 1, wherein one of the source and drain of the first transistor that is not connected to the light emitting element is connected to a member to which the power supply voltage is supplied. A display unit having a display area in which a plurality of types of display pixels having different emission colors are arranged, and a non-display area in which a plurality of types of adjustment pixels emitting the same type of color light as the emission color of the display pixels are arranged ,
A drive unit that drives each display pixel based on a video signal,
The adjustment pixel includes a light emitting element,
The drive unit derives a power supply voltage having a value corresponding to a voltage variation of a light emitting element included in the plurality of types of adjustment pixels for each emission color, and has the largest value among the derived power supply voltages for each emission color. A display device that extracts a power supply voltage and applies the extracted power supply voltage to at least each of the plurality of types of display pixels and the plurality of types of adjustment pixels. A display unit having a display area in which a plurality of types of display pixels having different emission colors are arranged, and a non-display area in which a plurality of types of adjustment pixels emitting the same type of color light as the emission color of the display pixels are arranged And a drive unit that drives each display pixel based on the video signal, and the adjustment pixel includes a light emitting element, and a value corresponding to a voltage variation of the light emitting element included in the plurality of types of adjustment pixels The power supply voltage for each emission color is derived for each emission color, and at least each display pixel among the plurality of types of display pixels and the plurality of types of adjustment pixels is associated with each emission color. A display device driving method including an applying step. A display unit having a display area in which a plurality of types of display pixels having different emission colors are arranged, and a non-display area in which a plurality of types of adjustment pixels emitting the same type of color light as the emission color of the display pixels are arranged And a drive unit that drives each display pixel based on the video signal, and the adjustment pixel includes a light emitting element, and a value corresponding to a voltage variation of the light emitting element included in the plurality of types of adjustment pixels Power supply voltage is derived for each emission color, the power supply voltage having the largest value is extracted from the derived power supply voltages for each emission color, and the extracted power supply voltages are adjusted to the plurality of types of display pixels and the plurality of types of adjustment. A method for driving a display device, comprising: applying to at least each display pixel of pixels for use. A display device,
The display device
A display unit having a display area in which a plurality of types of display pixels having different emission colors are arranged, and a non-display area in which a plurality of types of adjustment pixels emitting the same type of color light as the emission color of the display pixels are arranged ,
A drive unit for driving each display pixel based on the video signal,
The adjustment pixel includes a light emitting element,
The driving unit derives a power supply voltage having a value corresponding to a voltage variation of a light emitting element included in the plurality of types of adjustment pixels for each emission color, and the derived power supply voltage for each emission color is displayed on the plurality of types of display. An electronic device that applies to at least each display pixel among the pixels and the plurality of types of adjustment pixels in correspondence with each emission color. A display device,
The display device
A display unit having a display area in which a plurality of types of display pixels having different emission colors are arranged, and a non-display area in which a plurality of types of adjustment pixels emitting the same type of color light as the emission color of the display pixels are arranged ,
A drive unit for driving each display pixel based on the video signal,
The adjustment pixel includes a light emitting element,
The drive unit derives a power supply voltage having a value corresponding to a voltage variation of a light emitting element included in the plurality of types of adjustment pixels for each emission color, and has the largest value among the derived power supply voltages for each emission color. An electronic device that extracts a power supply voltage and applies the extracted power supply voltage to at least each of the plurality of types of display pixels and the plurality of types of adjustment pixels.

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