JP2006065148A - Display device, and its driving method - Google Patents

Display device, and its driving method Download PDF

Info

Publication number
JP2006065148A
JP2006065148A JP2004249568A JP2004249568A JP2006065148A JP 2006065148 A JP2006065148 A JP 2006065148A JP 2004249568 A JP2004249568 A JP 2004249568A JP 2004249568 A JP2004249568 A JP 2004249568A JP 2006065148 A JP2006065148 A JP 2006065148A
Authority
JP
Japan
Prior art keywords
voltage
display device
potential difference
driving
light emitting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2004249568A
Other languages
Japanese (ja)
Other versions
JP4622389B2 (en
Inventor
Kimitaka Kawase
公崇 川瀬
Original Assignee
Sony Corp
ソニー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Corp, ソニー株式会社 filed Critical Sony Corp
Priority to JP2004249568A priority Critical patent/JP4622389B2/en
Publication of JP2006065148A publication Critical patent/JP2006065148A/en
Application granted granted Critical
Publication of JP4622389B2 publication Critical patent/JP4622389B2/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Abstract

PROBLEM TO BE SOLVED: To provide a display device with low power consumption efficiency and a driving method thereof.
A peak value of video data is detected, and a cathode voltage Vc of an organic EL element 11 by a variable voltage source 8 is adjusted based on the detected data to reduce a potential difference between a power supply voltage VDD and a cathode voltage Vc. As a result, the power consumption of the display device 1 is suppressed. In particular, the cathode voltage Vc is adjusted within the range where the operating point, that is, the anode voltage of the organic EL element is located in the saturation region of the drive transistor 14 that drives the organic EL element 11, and the display luminance is hardly lowered. It is possible to reduce power consumption.
[Selection] Figure 1

Description

  The present invention relates to a display device in which a plurality of light emitting elements whose luminance depends on a drive current are arranged in a matrix and a driving method thereof, and more particularly to a display device having a high power consumption effect and a driving method thereof.

  In recent years, an organic EL display device using an organic electroluminescence (hereinafter abbreviated as “organic EL”) element as one of flat display devices has been actively developed. An organic EL display device is driven at a low voltage, is self-luminous, has excellent moving image characteristics, a wide viewing angle, and color reproducibility, and is regarded as one of the most promising display devices in the future. Furthermore, since it does not require a backlight and can be made thin, it is expected to be used for mobile devices such as portable information terminals.

  In mobile devices, low power consumption is required, but low power consumption of organic EL elements is still in the development stage, and low power consumption is a major issue. Thus, conventionally, a technique has been proposed in which the current value flowing through the light emitting element is detected, and the current flowing through the light emitting element is controlled based on the detected current value, thereby suppressing the light emission luminance and power consumption of the entire screen. (See Patent Document 1 below).

JP 2003-195816 A

  In general, the luminance of the organic EL element depends on the drive current supplied to the element, and the light emission luminance of the element increases in proportion to the drive current. Therefore, the power consumption of a display composed of organic EL elements is determined by the average display luminance. That is, unlike the liquid crystal display, the power consumption of the organic EL display varies greatly depending on the display image.

  For example, in an organic EL display, the highest power consumption is required when an all white image is displayed. However, in the case of a general natural image, a power consumption of about 20 to 40% is sufficient for all white images. It is said.

  However, since the power supply circuit design and battery capacity are designed assuming that the power consumption of the display is the largest, the power consumption must be considered 3 to 4 times that of a general natural image. Therefore, it is an obstacle to reducing the power consumption and size of the equipment.

  In addition, organic EL elements tend to increase in drive voltage over time due to their lifetime characteristics. For this reason, the power supply voltage supplied to the display and the cathode voltage of the organic EL element are set by adding a margin for a voltage increase accompanying a change with time. Therefore, in the initial use stage of the device, the voltage margin is wasted, making it difficult to reduce power consumption.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a display device with low power consumption efficiency and a driving method thereof.

  In solving the above problems, a display device according to the present invention includes a scanning line for selecting a pixel in a predetermined scanning cycle, a data line for providing luminance information for driving the pixel, and light emission whose luminance depends on a driving current. In a display device in which a plurality of pixel circuits in which an element and a driving transistor that supplies a driving current to the light emitting element are connected in series to a power supply voltage are arranged in a matrix, the anode voltage of the light emitting element is A potential difference adjusting means for reducing a potential difference between the power supply voltage and the cathode voltage of the light emitting element within a range located in the saturation region is provided.

  The display device driving method of the present invention includes a scanning line for selecting a pixel in a predetermined scanning cycle, a data line for providing luminance information for driving the pixel, a light emitting element whose luminance depends on a driving current, and the light emitting element. Data supplied to a data line in each column in a driving method of a display device in which a plurality of pixel circuits in which a driving transistor that supplies a driving current to a light emitting element is connected in series to a power supply voltage are arranged in a matrix. The step of detecting the peak value of the potential or the total amount of driving currents of all the light emitting elements and the anode voltage of the light emitting elements are within a range where the anode voltage of the driving transistor is located between the power supply voltage and the cathode voltage of the light emitting elements. And a step of reducing the potential difference.

  The potential difference adjusting means reduces the potential difference between the power supply voltage and the cathode voltage based on the peak value of the data potential supplied to the data line of each column or the total amount of drive currents of all the light emitting elements, and the display device To reduce the drive power consumption.

  In particular, as a reference for reducing the potential difference between the power supply voltage and the cathode voltage by the potential difference adjusting means, the cathode voltage is increased within a range where the operating point, that is, the anode voltage of the light emitting element is located on the saturation region of the driving transistor, or Reduce the power supply voltage. As a result, the potential difference between the power supply voltage and the cathode voltage can be reduced and the power consumption reduction efficiency can be increased without substantially reducing the display luminance.

  According to the present invention, in a display device that controls the luminance of a light emitting element by controlling a drive current, the power supply voltage of the light emitting element and the cathode are based on, for example, the peak value of the data signal or the total amount of current supplied to the display. Since the potential difference from the voltage is reduced, the power consumption can be reduced without affecting the image quality.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, an organic EL active matrix display device using an organic EL element as a light emitting element constituting each pixel will be described as an example.

[First Embodiment]
FIG. 1 is a schematic configuration diagram of an organic EL active matrix display device 1 according to a first embodiment of the present invention. The organic EL active matrix display device 1 includes an organic EL display unit 2, a horizontal drive circuit 3, a write scan drive circuit 4, a control circuit 5, a peak detection circuit 6, a signal processing circuit 7, and a variable voltage source 8. Yes.

  FIG. 2 is a schematic diagram showing the configuration of the organic EL display unit 2. As shown, a plurality of write scanning lines X are arranged in rows and a plurality of data lines Y are arranged in columns. Pixels 10 are arranged at intersections between the write scanning lines X and the data lines Y.

  The write scan line X is connected to the write scan drive circuit 4. The write scan drive circuit 4 includes a shift register and is supplied with a vertical clock VCK and a vertical start pulse VSP from the control circuit 5 (FIG. 1). Then, by sequentially transferring the vertical start pulse VSP in synchronization with the vertical clock VCK, the write scanning lines X are sequentially selected within one scanning cycle.

  On the other hand, the data line Y is connected to a horizontal drive circuit (data line drive circuit) 3. The horizontal driving circuit 3 outputs an electric signal (Vsig described later) corresponding to the luminance information of each data line Y supplied from the signal processing circuit 7 (FIG. 1) in synchronization with the line sequential scanning of the scanning lines X. . The horizontal drive circuit 3 includes a shift register. The horizontal clock HCK and the horizontal start pulse HSP are supplied from the control circuit 5 (FIG. 1), and the horizontal start pulse HSP is sequentially transferred in synchronization with the horizontal clock HCK. The data lines Y are selected sequentially.

  FIG. 3 is a configuration example of the pixel 10 of the organic EL display unit 2. The circuit shown in FIG. 3 shows a voltage writing type pixel circuit 10A in which luminance information is written by voltage control of the data line Y, and one pixel circuit 10A constitutes one pixel 10. The pixel circuit 10 </ b> A includes an organic EL element 11, a current supply line 12, a data line Y, a write scan line X, a write scan transistor 13, a drive transistor 14, and a storage capacitor 15.

  The source (or drain) of the write scan transistor 13 is connected to the gate of the drive transistor 14, and the drain (or source) is connected to the data line Y. A write scan line X is connected to the gate of the write scan transistor 13. The source of the driving transistor 14 is connected to the current supply line 12 and is connected to the anode of the organic EL element 11. One terminal of the storage capacitor 15 is connected to the gate of the drive transistor 14, and the other terminal is connected to the current supply line 12.

  The current supply line 12 is connected to a power supply voltage (VDD) and is a constant current source that drives the organic EL element 11 to emit light. The current supply line 12, the drive transistor 14, and the organic EL element 11 are connected in series, and the light emission luminance of the organic EL element 11 is a drive corresponding to the gate-source potential (Vgs) of the drive transistor 14. It depends (proportional) on the magnitude of the current (current flowing through the source and drain) I.

  The write scan transistor 13 and the drive transistor 14 are composed of a MOS (Metal Oxide Semiconductor) type field effect transistor, for example, a polysilicon TFT (Thin Film Transistor). The write scan transistor 13 is an N type, and the drive transistor 14 is The transistor is a P-type transistor.

  When writing data to the pixel 10, the write scanning line X is set to H (High) level, and the write scanning transistor 13 is turned on. At this time, the data line Y and the gate of the driving transistor 14 are connected to each other. As the potential of the data line Y is lower, the voltage (Vgs) between the source and the gate of the driving transistor 14 increases, and the current flowing through the source and drain of the driving transistor 14, that is, the driving current of the organic EL element 11 increases. The emission luminance (emission intensity) increases. The holding capacitor 15 holds the gate voltage of the driving transistor 14 and maintains the light emission of the organic EL element 11 even when the write scanning line X becomes L (Low) level. Thereby, the light emission operation | movement of an organic EL element is hold | maintained during one scanning cycle.

  Referring to FIG. 1, a peak detection circuit 6 corresponds to the “peak value detection means” of the present invention, and is a circuit that detects the peak value of input video data (voltage signal). Signal) to the variable voltage source 8. The signal processing circuit 7 converts the data potential (Vsig) supplied to each pixel circuit 10 </ b> A of the organic EL display unit 2 based on the video data input through the peak detection circuit 6 and inputs the data potential to the data line Y. .

  The variable voltage source 8 is connected to the cathode of each organic EL element 11 of the organic EL display unit 2 via the cathode line 9, and the power supply voltage (current supply line 12) and the cathode voltage of each organic EL element 11 are The function of adjusting the potential difference between the two is provided. That is, the variable voltage source 8 corresponds to “potential difference adjusting means” of the present invention.

  Next, the operation principle of the present invention will be described. First, the electrical characteristics and optical characteristics of the organic EL element 11 will be described.

  FIG. 4 shows the relationship between the driving voltage V and the driving current I when the driving voltage (anode-cathode voltage) of the organic EL element 11 is V, the driving current (current flowing through the element) is I, and the emission luminance is L. FIG. 5 shows the relationship between the drive current I and the light emission luminance L, respectively.

  As shown in FIG. 4, the drive current I is approximated by a power function with respect to the drive voltage V. Further, as shown in FIG. 5, the light emission luminance L is proportional to the drive current I. Therefore, in the case of active matrix driving, the driving transistor 14 is connected to the organic EL element 11 and the driving current I of the driving transistor 14 is controlled, whereby the light emission luminance of the organic EL element 11 is controlled.

  Next, characteristics of the drive transistor 14 for driving the organic EL element 11 will be described.

  As shown in FIG. 3, the voltage of the current supply line 12 is VDD, the gate-source potential of the drive transistor 14 is Vgs, the drain voltage with respect to the source is the drive voltage V, and the current flowing between the source and drain is I. Here, FIG. 6 shows the relationship between the drive voltage V and the drive current I when Vgs is larger than the threshold voltage Vth of the drive transistor 14 (Vgs> Vth). The characteristic changes depending on the magnitude of Vgs, and shows the case where Vgs is large and small.

  In FIG. 6, in a region where the driving voltage V is smaller than a certain voltage (= Vgs−Vth: Vgs large corresponds to VA in the figure, and Vgs small corresponds to VB in the figure), the driving current I is almost equal. It rises linearly (linear region) and saturates at higher voltages (saturation region). That is, when the drive voltage V is large, the drive current I is substantially constant, and as the drive voltage V is decreased, the drive current I decreases from around VA or VB. The voltage at the boundary increases as Vgs increases (VB <VA).

  FIG. 7 shows the characteristics of the drive current I with respect to Vgs in the saturation region of the drive transistor 14. When Vgs becomes larger than the threshold voltage Vth, the drive current I increases in proportion to the square of (Vgs−Vth). The drive current that determines the light emission luminance L of the organic EL element 11 is controlled by Vgs. When the high gradation, that is, the light emission luminance is increased, Vgs is increased, and when the low gradation, that is, the light emission luminance is decreased, Vgs is decreased. To do.

  As shown in FIG. 3, the source of the drive transistor 14 is connected to the power supply voltage VDD, and the drain of the drive transistor 14 and the anode of the organic EL element 11 are connected at a point X. The relationship between the driving voltage V and the driving current (current flowing through the organic EL element 11) I at this time is shown in FIG. As the direction of the driving voltage V on the horizontal axis, VDD is the origin, and the direction below VDD is the positive direction. At this time, the drive transistor 14 has the characteristics shown in FIG. A case where Vgs is large and a case where Vgs is small are shown as gradation A and gradation B, respectively.

  On the other hand, as for the characteristics of the organic EL element 11, the current increases with the characteristics shown in FIG. 4 as the voltage rises (goes in the negative direction) starting from the cathode. The figure shows a case where the potential difference between VDD and the cathode is large (cathode voltage A) and a case where the potential difference is small (cathode voltage B). Let each curve be OLEDA and OLEDB.

  Here, the intersections of OLEDA and gradations A and B are X4 and X2, respectively, and the intersections of OLEDB and gradations A and B are X3 and X1, respectively. The voltage V at these intersection points corresponds to the point X in FIG. 3, that is, the anode voltage of the organic EL element 11, and this point is generally referred to as an operating point.

  When the potential difference between VDD and the cathode voltage of the organic EL element 11 is large, for example, in the state of the cathode voltage A in FIG. 8, the operating point is in the saturation region of the drive transistor 14 regardless of whether the gradation is large or small. When the cathode voltage is decreased, for example, the gradation B is in the saturation region in the state of the cathode voltage B, and the difference ΔIB of the drive current I from the case of the cathode voltage A is slight. On the other hand, in the case of gradation A, it is in the linear region, and the difference ΔIA of the drive current I becomes large.

  In short, when the gradation is small, it means that even if the cathode voltage is reduced, there is almost no variation in the drive current I, that is, the light emission luminance. The power consumption is expressed by I × (VDD−Vc) where the cathode voltage is Vc. From this equation, as the cathode voltage Vc increases, (VDD−Vc) decreases and power consumption decreases.

  Next, FIG. 9 shows characteristics of the organic EL element 11 over time. FIG. 9 shows the relative luminance when the initial luminance is 1 with respect to the cumulative driving time of the organic EL element 11. FIG. 10 shows the characteristics of the drive voltage V with respect to the accumulated drive time. As the integrated driving time increases, the luminance decreases and the driving voltage V tends to increase.

  Therefore, in a display device using a conventional organic EL element as a light emitting element, it is necessary to set the voltage between VDD and Vc to be large in consideration of an increase in driving voltage over time. However, in this case, wasteful power consumption occurs in the initial use of the device.

  Hereinafter, data actually measured in a specific circuit will be shown. The circuit is the pixel circuit 10A shown in FIG. 3, and the potential difference of the data line Y with respect to the voltage (VDD) of the current supply line 12 is Vsig. This Vsig is a data potential input to the data line Y, and the higher the Vsig, the higher the gradation.

  FIG. 11 shows the screen brightness of the display device with respect to Vsig. As Vsig is increased, the luminance increases with the square characteristic above the threshold voltage (2.5 V) of the driving transistor 14. This can be explained by the characteristics shown in FIG.

  FIG. 12 shows the relationship between the cathode voltage Vc of the organic EL element 11 and the screen luminance. Here, the horizontal axis is positive in the voltage direction of the current supply line 12 with the voltage corresponding to the cathode voltage A in FIG. 8 as the origin, for example, when the operating point is sufficiently in the saturation region of the driving transistor 14 even at high gradation.

  In FIG. 12, four gradations (Vsig1, Vsig2, Vsig3, Vsig4) are shown, and Vsig4 is on the high gradation side. As shown in the figure, on the high gradation side, the luminance decreases when the cathode voltage is small. This is because, as described with reference to FIG. 8, when the cathode voltage is increased, the higher the gradation level, the more the linear region is entered, and the drive current I, that is, the luminance is lowered.

  FIG. 13 shows the relative luminance with respect to the cathode voltage when the luminance when the cathode voltage is zero is set to 1 on the vertical axis of FIG. In Vsig1, even if the cathode voltage is 6V, there is almost no change. In the case of Vsig4, when the cathode voltage exceeds 3V, the luminance is greatly reduced.

  FIG. 14 shows the luminance of the display device and the total amount of current with respect to the cathode voltage. Here, Vsig corresponds to Vsig4 in FIG. As the cathode voltage increases, the two curves show almost the same behavior. FIG. 15 shows a relative value with respect to the value when the cathode voltage is zero in FIG. Even if this figure is seen, relative brightness and a relative current begin to fall large with the substantially same cathode voltage. This can be explained from the fact that the current and the luminance are in a linear relationship as shown in FIG.

  Further, FIG. 16 shows relative luminance with respect to the cathode voltage for each color of red (R), green (G), and blue (B). The characteristics of R, G, and B are different because the characteristics shown in FIG. 4 are different for each light emitting element and the operating point X shown in FIG. 8 is different. As the threshold voltage increases, the voltage at the operating point shifts toward the cathode voltage, and the value of the cathode voltage at which the relative luminance starts to decrease greatly in FIG. 16 decreases. In the example of FIG. 16, the blue (B) threshold voltage is the largest.

  Now, based on the above description, the operation of the organic EL active matrix display device 1 of the present embodiment shown in FIG. 1 will be described.

  The video data is first input to the peak detection circuit 6 where the peak potential of the video data is detected. A voltage control signal is generated based on the peak detection data in the peak detection circuit 6 and is output to the variable voltage source 8. On the other hand, the video data is input to the signal processing circuit 7 through the peak detection circuit 6. Here, the video data is converted into a data potential corresponding to Vsig of each pixel circuit 10 </ b> A of the organic EL display unit 2, and is input to each data line Y in the horizontal drive circuit 3.

  Based on the voltage control signal from the peak detection circuit 6, the variable voltage source 8 increases the cathode voltage of the organic EL element 11 in each pixel circuit 10A via the cathode line 9 commonly connected to each pixel circuit 10A. Thus, the potential difference between the power supply voltage VDD and the cathode voltage Vc of the current supply line 12 is reduced, and the drive power consumption of the organic EL display unit 2 (display device 1) is reduced.

  In particular, in the present embodiment, the operating point, that is, the anode voltage of the organic EL element 11 is located in the saturation region of the driving transistor 14 operating with Vsig data, as a reference when raising the cathode voltage Vc by the variable voltage source 8. Within the range, the cathode voltage Vc is increased. As a result, the potential difference between VDD and Vc can be reduced and the power consumption reduction efficiency can be increased without substantially reducing the display luminance.

  That is, when the peak value of the video data detected by the peak detection circuit 6 is large, for example, when it corresponds to Vsig4 in FIG. 13, if the cathode voltage Vc is increased by 3 V or more, the luminance drop increases, but the peak value is increased. In the case of being small, for example, corresponding to Vsig2 in FIG. 13, even if the cathode voltage Vc is increased to 5V, the luminance reduction is not so much affected. That is, since the cathode voltage Vc can be increased as the peak value of the video data is smaller, power consumption can be suppressed.

  Thus, in this embodiment, the peak value of the data potential supplied to the data line of each column is detected, and the cathode voltage Vc of the organic EL element 11 by the variable voltage source 8 is optimized based on the detected data. It is possible to reduce the power consumption of the organic EL display unit 2 by adjusting the voltage to an appropriate voltage.

  The adjustment of the cathode potential Vc by the variable voltage source 8 can be performed, for example, in a video frame period. In this case, a constant power consumption reduction effect can always be obtained when displaying an image having different video data peaks for each frame.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  FIG. 17 is a schematic configuration diagram of an organic EL active matrix display device 21 according to the second embodiment of the present invention. In the figure, portions corresponding to those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  The organic EL active matrix display device 21 of the present embodiment includes an organic EL display unit 2, a horizontal drive circuit 3, a write scan drive circuit 4, a control circuit 5, a signal processing circuit 7, a variable voltage source 8, and a bias resistor 22. The current detection circuit 23 and the signal amplification circuit 24 are configured.

  Video data is input to the signal processing circuit 7, where it is converted into a data potential corresponding to Vsig of each pixel circuit 10 </ b> A of the organic EL display unit 2, and input to each data line Y in the horizontal drive circuit 3.

  The bias resistor 22 is connected between the variable voltage source 8 and the cathode line 9. The current flowing through the cathode line 9 is subjected to current-voltage conversion by the bias resistor 22, and the voltage across the resistor V 1 and V 2 are input to the current detection circuit 23. The current detection circuit 23 detects the cathode current flowing through the cathode line 9, that is, the total drive current amount of the organic EL elements 11 for all pixels, and generates a voltage control signal and a data control signal based on the detected cathode current. The voltage control signal is output to the variable voltage source 8, and the data control signal is output to the signal amplifier circuit 24.

  From the characteristics of the organic EL element 11 shown in FIGS. 4 and 5, the cathode current value increases in proportion to the light emission luminance. Therefore, the power consumption of the display device is proportional to the average luminance of the display image. For example, when the display image is all white, the power consumption is very large. However, when a natural image is displayed by a digital camera or a video camera, the average luminance is about 30 to 40% of the case of all white. On the other hand, when the average luminance is high, the image quality is not greatly affected even if the peak luminance is lowered.

  Therefore, in the present embodiment, when the cathode voltage Vc is adjusted by the variable voltage source 8, and the cathode current value is larger than a predetermined value, that is, when the screen average luminance is larger than the predetermined value, the peak value of the video data is obtained. In order to limit the above, the signal amplifier circuit 24 is constituted by a variable amplifier, and a limit function is provided for a video data peak value above a certain level. The current detection circuit 23 corresponds to “current detection means” of the present invention, and the signal amplification circuit 24 corresponds to “data potential control means” of the present invention.

  Specifically, the current detection circuit 23 determines a voltage control signal and a data control signal based on the detected cathode current value. For example, when the average luminance is large, Vsig is decreased by the signal amplification circuit 24 through the data control signal to lower the peak luminance. If the peak luminance decreases, as shown in FIG. 13, even if the cathode voltage is increased within the range where the operating point is located in the saturation region of the driving transistor 14 operating at the Vsig, the image quality is not affected. It becomes possible to suppress power consumption.

  By the way, since the drive voltage of the organic EL element 11 increases with time as described with reference to FIG. 10, conventionally, the cathode voltage has been set low in view of this. In this case, as described above, useless power consumption occurs particularly in the initial use.

  On the other hand, in the present embodiment, by utilizing the fact that the luminance and current show substantially the same behavior as shown in FIG. 15, the variable voltage source 8 changes the cathode voltage of the organic EL element 11 and By detecting the current cathode current with the current detection circuit 23 and detecting the current value that does not affect the image quality, the optimum cathode voltage can be fed back to the variable voltage source 8.

  Thereby, it becomes possible to always set an optimum cathode voltage regardless of the change of the organic EL element 11 with time, and it becomes possible to minimize power consumption. Such processing can be performed, for example, using a short time at startup.

[Third Embodiment]
FIG. 18 shows a third embodiment of the present invention. In the figure, portions corresponding to those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the cathode lines 9R, 9G, and 9B connected to the cathodes of the organic EL elements are provided independently for each of the R, G, and B pixel circuits 10R, 10G, and 10B. As shown in FIG. 16, the optimum cathode voltage differs depending on each color. For example, the cathode voltage of red R can be set larger than that of blue B. Thus, by providing the cathode lines independently for each color, it is possible to set an optimum cathode voltage for each color, and it is possible to increase the power consumption reduction efficiency.

  The cathode voltage for each color may be set using a single variable voltage source 8 or a dedicated variable voltage source may be installed for each color. It is also possible to connect a cathode line in common to each color and set the cathode voltage with reference to blue B. However, the present embodiment in which a cathode line is provided for each color is more effective in reducing power consumption. Can be high.

[Fourth Embodiment]
Further, FIG. 19 shows a fourth embodiment of the present invention. In the figure, portions corresponding to those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  In each of the embodiments described above, the variable voltage source 8 having a function of adjusting the cathode voltage Vc as potential difference adjusting means for reducing the potential difference between the current supply line (power supply voltage) VDD and the cathode voltage Vc of the organic EL element 11. In the present embodiment, the potential difference adjusting unit has a function of adjusting the power supply voltage of the current supply line. By adjusting the power supply voltage in the direction of decreasing, VDD−Vc The potential difference is reduced.

  In the example of FIG. 19, current supply lines 12R, 12G, and 12B connected to the pixel circuits 10R, 10G, and 10B for the R, G, and B colors are provided independently for each color, and the current supply lines 12R, 12G, and 12B are provided. The power supply voltage VDD is made variable every time. Even with such a configuration, it is possible to obtain the same functions and effects as those of the above-described embodiments, and to reduce the power consumption of the organic EL display unit 2.

  In the example of FIG. 19, the cathode line 9 is common to the pixel circuits 10R, 10G, and 10B. However, as in the third embodiment described above, the cathode line is independently provided for each pixel circuit of each color. Of course, it is also possible to provide it, and this can further enhance the power consumption reduction effect.

  As mentioned above, although each embodiment of this invention was described, of course, this invention is not limited to these, A various deformation | transformation is possible based on the technical idea of this invention.

  For example, in the above embodiment, as the pixel circuit 10A (10R, 10G, 10B) constituting the organic EL display unit 2, a voltage writing type pixel circuit in which luminance information is written by voltage control of the data line is taken as an example. In addition to this, it is also possible to use a current writing type pixel circuit that performs writing of luminance information by current control of the data line. The present invention can also be applied to a pixel circuit in which the light emission luminance of the organic EL element 11 is controlled by pulse control.

  In each of the above embodiments, as a reference for reducing the potential difference between the power supply voltage VDD and the cathode voltage Vc, adjustment is performed within a range where the operating point (anode voltage) is located on the saturation region of the drive transistor 14. However, as another expression, control for increasing the cathode voltage Vc to the falling point (knee point) of the relative luminance in FIG. 13 may be performed.

1 is a schematic configuration diagram of an organic EL active matrix display device 1 according to a first embodiment of the present invention. 2 is a schematic configuration diagram of an organic EL display unit 2. FIG. It is a circuit diagram of pixel circuit 10A. It is a figure explaining the relationship between the drive voltage and drive current of the organic EL element. It is a figure explaining the relationship between the drive current of the organic EL element 11, and light emission luminance. FIG. 6 is a diagram for explaining current-voltage characteristics of a drive transistor. 6 is a diagram for explaining a relationship between Vgs of a driving transistor and a driving current I. FIG. It is the figure which combined and showed the current-voltage characteristic of the drive transistor 14, and the cathode voltage-current characteristic of an organic EL element. It is a figure explaining the relationship between the drive time of an organic EL element, and relative luminance. It is a figure explaining the relationship between the drive time of the organic EL element 11, and a drive voltage. It is a figure explaining the relationship between data potential Vsig and screen brightness | luminance. It is a figure which shows the change of the screen brightness | luminance with respect to the cathode voltage for every gradation. It is a figure which shows the change of the relative luminance of each gradation degree with respect to a cathode voltage. It is a figure which shows the change of the screen brightness | luminance and the total electric current amount with respect to a cathode voltage. It is a figure which shows the change of the screen relative luminance and relative current with respect to a cathode voltage. It is a figure which shows the change of the relative luminance of each light emitting element with respect to a cathode voltage. It is a schematic block diagram of the organic electroluminescent active matrix type display device 21 by the 2nd Embodiment of this invention. It is a pixel circuit diagram which shows the 3rd Embodiment of this invention. It is a pixel circuit diagram which shows the 4th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 21 ... Organic EL active-matrix display device, 2 ... Organic EL display part, 3 ... Horizontal drive circuit, 4 ... Write scanning drive circuit, 5 ... Control circuit, 6 ... Peak detection circuit, 7 ... Signal processing circuit, DESCRIPTION OF SYMBOLS 8 ... Variable voltage source, 9 ... Cathode line, 10 ... Pixel, 10A ... Pixel circuit, 11 ... Organic EL element, 12 ... Current supply line, 13 ... Write scanning transistor, 14 ... Drive transistor, 15 ... Retention capacitance, 22 ... Bias resistor, 23 ... Current detection circuit, 24 ... Signal amplification circuit.

Claims (11)

  1. A scanning line for selecting a pixel in a predetermined scanning cycle, a data line for providing luminance information for driving the pixel, a light emitting element whose luminance depends on a driving current, and a driving transistor for supplying a driving current to the light emitting element In a display device in which a plurality of pixel circuits connected in series to a power supply voltage are arranged in a matrix,
    The display includes: a potential difference adjusting unit configured to reduce a potential difference between the power supply voltage and the cathode voltage of the light emitting element within a range where an anode voltage of the light emitting element is located in a saturation region of the driving transistor. apparatus.
  2. Peak value detecting means for detecting a peak value of the data potential supplied to the data line of each column is provided, and the potential difference adjusting means is configured to detect a difference between the power supply voltage and the cathode voltage based on an output of the peak value detecting means. The display device according to claim 1, wherein the potential difference is reduced.
  3. Current detection means for detecting the total drive current amount of all the light emitting elements, and data potential control means for controlling the data potential supplied to the data line of each column, and based on the output of the current detection means, The display device according to claim 1, wherein the potential difference adjusting unit reduces a potential difference between the power supply voltage and the cathode voltage, and the data potential control unit limits a peak value of the data potential.
  4. The pixel circuit is independent of each color of red, green, and blue, and the potential difference adjusting unit adjusts a potential difference between the power supply voltage and the cathode voltage for each color. Display device.
  5. The display device according to claim 1, wherein the potential difference adjusting unit has a function of adjusting the cathode voltage.
  6. The display device according to claim 1, wherein the potential difference adjusting unit has a function of adjusting the power supply voltage.
  7. The display device according to claim 1, wherein the light emitting element is an organic electroluminescence element.
  8. A scanning line for selecting a pixel in a predetermined scanning cycle, a data line for providing luminance information for driving the pixel, a light emitting element whose luminance depends on a driving current, and a driving transistor for supplying a driving current to the light emitting element In a driving method of a display device in which a plurality of pixel circuits connected in series with respect to a power supply voltage are arranged in a matrix,
    Detecting a peak value of a data potential supplied to the data line of each column or a total driving current amount of all the light emitting elements;
    Reducing the potential difference between the power supply voltage and the cathode voltage of the light emitting element within a range where the anode voltage of the light emitting element is located in a saturation region of the driving transistor. Driving method.
  9. The display device driving method according to claim 8, further comprising a step of limiting a peak value of the data potential based on a detection amount of a total driving current amount supplied to each of the pixel circuits.
  10. The method for driving a display device according to claim 8, wherein the adjustment of the potential difference between the power supply voltage and the cathode voltage is performed at the initial stage of startup of the display device.
  11. 9. The display device drive according to claim 8, wherein the pixel circuit is provided independently for each color of red, green, and blue, and a potential difference between the power supply voltage and the cathode voltage is adjusted for each color. Method.
JP2004249568A 2004-08-30 2004-08-30 Display device and driving method thereof Expired - Fee Related JP4622389B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004249568A JP4622389B2 (en) 2004-08-30 2004-08-30 Display device and driving method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004249568A JP4622389B2 (en) 2004-08-30 2004-08-30 Display device and driving method thereof

Publications (2)

Publication Number Publication Date
JP2006065148A true JP2006065148A (en) 2006-03-09
JP4622389B2 JP4622389B2 (en) 2011-02-02

Family

ID=36111682

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004249568A Expired - Fee Related JP4622389B2 (en) 2004-08-30 2004-08-30 Display device and driving method thereof

Country Status (1)

Country Link
JP (1) JP4622389B2 (en)

Cited By (56)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0734026A (en) * 1993-07-21 1995-02-03 Asahi Glass Co Ltd Fluororubber coating composition
JP2006065242A (en) * 2004-08-30 2006-03-09 Toshiba Matsushita Display Technology Co Ltd El display device
JP2006091681A (en) * 2004-09-27 2006-04-06 Hitachi Displays Ltd Display device and display method
JP2006276713A (en) * 2005-03-30 2006-10-12 Toshiba Matsushita Display Technology Co Ltd Power supply circuit for el display apparatus
JP2008083085A (en) * 2006-09-25 2008-04-10 Sony Corp Image display device and driving method therefor
JP2008089726A (en) * 2006-09-29 2008-04-17 Seiko Epson Corp Active matrix type light emitting device, pixel power source switching method of active matrix type light emitting device, and electronic apparatus
JP2008134611A (en) * 2006-10-31 2008-06-12 Kyocera Corp Method of driving image display device and image display device
JP2009508171A (en) * 2005-09-12 2009-02-26 ケンブリッジ ディスプレイ テクノロジー リミテッド Active matrix display drive control system
JP2009069484A (en) * 2007-09-13 2009-04-02 Sony Corp Display device, and display driving method
JP2009069485A (en) * 2007-09-13 2009-04-02 Sony Corp Display device, and display driving method
EP2085956A1 (en) 2008-02-01 2009-08-05 Samsung Mobile Display Co., Ltd. Organic light emitting display and driving method thereof
JP2009258356A (en) * 2008-04-16 2009-11-05 Seiko Epson Corp Image display apparatus, voltage control method and computer program
JP2009282158A (en) * 2008-05-20 2009-12-03 Samsung Electronics Co Ltd Display device
JP2011034036A (en) * 2009-07-30 2011-02-17 Samsung Mobile Display Co Ltd Organic light emitting display device and driving voltage setting method thereof
JP2011039471A (en) * 2009-08-18 2011-02-24 Samsung Mobile Display Co Ltd Power supply device, display device including the same, and its driving method
KR101022106B1 (en) * 2008-08-06 2011-03-17 삼성모바일디스플레이주식회사 Organic ligth emitting display
CN102074182A (en) * 2009-11-19 2011-05-25 三星移动显示器株式会社 Display apparatus and driving method thereof
KR101064370B1 (en) 2009-11-17 2011-09-14 삼성모바일디스플레이주식회사 Organic light emitting display and driving method thereof
WO2012001990A1 (en) * 2010-07-02 2012-01-05 パナソニック株式会社 Display device and driving method thereof
WO2012001991A1 (en) * 2010-07-02 2012-01-05 パナソニック株式会社 Display device and method for driving same
CN102414732A (en) * 2009-11-12 2012-04-11 松下电器产业株式会社 Drive voltage generating circuit
WO2012077258A1 (en) * 2010-12-10 2012-06-14 パナソニック株式会社 Display device and driving method therefor
JP2012194531A (en) * 2011-03-14 2012-10-11 Samsung Mobile Display Co Ltd Active matrix display device and driving method for the same
WO2012156942A1 (en) 2011-05-17 2012-11-22 Ignis Innovation Inc. Systems and methods for display systems with dynamic power control
WO2012172607A1 (en) 2011-06-16 2012-12-20 パナソニック株式会社 Display device
WO2012172604A1 (en) 2011-06-16 2012-12-20 パナソニック株式会社 Display device
WO2013005257A1 (en) * 2011-07-06 2013-01-10 パナソニック株式会社 Display device
WO2013008270A1 (en) * 2011-07-11 2013-01-17 パナソニック株式会社 Display device
WO2013008271A1 (en) 2011-07-12 2013-01-17 パナソニック株式会社 Display device
WO2013008272A1 (en) 2011-07-12 2013-01-17 パナソニック株式会社 Display device and method for driving display device
JP2013513132A (en) * 2009-12-06 2013-04-18 イグニス・イノベイション・インコーポレーテッドIgnis Innovation Incorporated Power saving system and method for AMOLED pixel driver
WO2013094104A1 (en) * 2011-12-20 2013-06-27 パナソニック株式会社 Display device and drive method for same
US8593448B2 (en) 2010-05-06 2013-11-26 Samsung Display Co., Ltd. Organic light emitting display and method of driving the same
WO2015021721A1 (en) * 2013-08-16 2015-02-19 京东方科技集团股份有限公司 Method for regulating driving voltage of pixel circuit, regulating apparatus thereof, and display device
US9058772B2 (en) 2010-01-13 2015-06-16 Joled Inc. Display device and driving method thereof
US9224954B2 (en) 2011-08-03 2015-12-29 Ignis Innovation Inc. Organic light emitting diode and method of manufacturing
US9275572B2 (en) 2011-06-23 2016-03-01 Joled Inc. Display device and display device driving method for causing reduction in power consumption
US9385169B2 (en) 2011-11-29 2016-07-05 Ignis Innovation Inc. Multi-functional active matrix organic light-emitting diode display
US9502653B2 (en) 2013-12-25 2016-11-22 Ignis Innovation Inc. Electrode contacts
US9606607B2 (en) 2011-05-17 2017-03-28 Ignis Innovation Inc. Systems and methods for display systems with dynamic power control
US9620057B2 (en) 2013-08-16 2017-04-11 Boe Technology Group Co., Ltd. Method and apparatus for adjusting driving voltage for pixel circuit, and display device
US9728135B2 (en) 2005-01-28 2017-08-08 Ignis Innovation Inc. Voltage programmed pixel circuit, display system and driving method thereof
US9734758B2 (en) 2013-10-18 2017-08-15 Joled Inc. Display device and method for driving same
US9761172B2 (en) 2010-05-12 2017-09-12 Samsung Display Co., Ltd. Organic light emitting diode display device and driving method thereof
US9818376B2 (en) 2009-11-12 2017-11-14 Ignis Innovation Inc. Stable fast programming scheme for displays
US9842889B2 (en) 2014-11-28 2017-12-12 Ignis Innovation Inc. High pixel density array architecture
US9934725B2 (en) 2013-03-08 2018-04-03 Ignis Innovation Inc. Pixel circuits for AMOLED displays
US9952698B2 (en) 2013-03-15 2018-04-24 Ignis Innovation Inc. Dynamic adjustment of touch resolutions on an AMOLED display
JP2018531425A (en) * 2015-10-13 2018-10-25 深▲セン▼市華星光電技術有限公司 Method and system for improving contrast ratio of OLED display panel
US10121411B2 (en) 2014-11-20 2018-11-06 Joled Inc. Display device and display method for reducing power consumption of a source driver
US10163996B2 (en) 2003-02-24 2018-12-25 Ignis Innovation Inc. Pixel having an organic light emitting diode and method of fabricating the pixel
US10176752B2 (en) 2014-03-24 2019-01-08 Ignis Innovation Inc. Integrated gate driver
US10204540B2 (en) 2015-10-26 2019-02-12 Ignis Innovation Inc. High density pixel pattern
US10373554B2 (en) 2015-07-24 2019-08-06 Ignis Innovation Inc. Pixels and reference circuits and timing techniques
US10410579B2 (en) 2015-07-24 2019-09-10 Ignis Innovation Inc. Systems and methods of hybrid calibration of bias current
WO2019187062A1 (en) * 2018-03-30 2019-10-03 シャープ株式会社 Method for driving display device and display device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000267628A (en) * 1999-03-18 2000-09-29 Sanyo Electric Co Ltd Active el display device
JP2002251167A (en) * 2001-02-26 2002-09-06 Sanyo Electric Co Ltd Display device
JP2002311898A (en) * 2001-02-08 2002-10-25 Semiconductor Energy Lab Co Ltd Light emitting device and electronic equipment using the same
JP2002351399A (en) * 2001-05-28 2002-12-06 Pioneer Electronic Corp Driving device of light emitting panel and personal digital assistant having the panel
JP2003195816A (en) * 2001-12-26 2003-07-09 Sony Corp Organic el display device and its control method
JP2003241714A (en) * 2001-12-13 2003-08-29 Matsushita Electric Ind Co Ltd Method for driving display device, and display device
JP2003280583A (en) * 2002-03-26 2003-10-02 Sanyo Electric Co Ltd Organic el display device
JP2003316320A (en) * 2002-04-24 2003-11-07 Sanyo Electric Co Ltd Display device
JP2004170943A (en) * 2002-10-31 2004-06-17 Semiconductor Energy Lab Co Ltd Display device and its control method
JP2005300929A (en) * 2004-04-12 2005-10-27 Sanyo Electric Co Ltd Display device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000267628A (en) * 1999-03-18 2000-09-29 Sanyo Electric Co Ltd Active el display device
JP2002311898A (en) * 2001-02-08 2002-10-25 Semiconductor Energy Lab Co Ltd Light emitting device and electronic equipment using the same
JP2002251167A (en) * 2001-02-26 2002-09-06 Sanyo Electric Co Ltd Display device
JP2002351399A (en) * 2001-05-28 2002-12-06 Pioneer Electronic Corp Driving device of light emitting panel and personal digital assistant having the panel
JP2003241714A (en) * 2001-12-13 2003-08-29 Matsushita Electric Ind Co Ltd Method for driving display device, and display device
JP2003195816A (en) * 2001-12-26 2003-07-09 Sony Corp Organic el display device and its control method
JP2003280583A (en) * 2002-03-26 2003-10-02 Sanyo Electric Co Ltd Organic el display device
JP2003316320A (en) * 2002-04-24 2003-11-07 Sanyo Electric Co Ltd Display device
JP2004170943A (en) * 2002-10-31 2004-06-17 Semiconductor Energy Lab Co Ltd Display device and its control method
JP2005300929A (en) * 2004-04-12 2005-10-27 Sanyo Electric Co Ltd Display device

Cited By (107)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0734026A (en) * 1993-07-21 1995-02-03 Asahi Glass Co Ltd Fluororubber coating composition
US10163996B2 (en) 2003-02-24 2018-12-25 Ignis Innovation Inc. Pixel having an organic light emitting diode and method of fabricating the pixel
JP2006065242A (en) * 2004-08-30 2006-03-09 Toshiba Matsushita Display Technology Co Ltd El display device
JP4703146B2 (en) * 2004-08-30 2011-06-15 東芝モバイルディスプレイ株式会社 EL display device and driving method of EL display device
JP2006091681A (en) * 2004-09-27 2006-04-06 Hitachi Displays Ltd Display device and display method
US9728135B2 (en) 2005-01-28 2017-08-08 Ignis Innovation Inc. Voltage programmed pixel circuit, display system and driving method thereof
JP2006276713A (en) * 2005-03-30 2006-10-12 Toshiba Matsushita Display Technology Co Ltd Power supply circuit for el display apparatus
JP2009508171A (en) * 2005-09-12 2009-02-26 ケンブリッジ ディスプレイ テクノロジー リミテッド Active matrix display drive control system
JP2008083085A (en) * 2006-09-25 2008-04-10 Sony Corp Image display device and driving method therefor
JP4631837B2 (en) * 2006-09-29 2011-02-23 セイコーエプソン株式会社 Active matrix light emitting device, pixel power supply switching method in active matrix light emitting device, and electronic apparatus
JP2008089726A (en) * 2006-09-29 2008-04-17 Seiko Epson Corp Active matrix type light emitting device, pixel power source switching method of active matrix type light emitting device, and electronic apparatus
JP2008134611A (en) * 2006-10-31 2008-06-12 Kyocera Corp Method of driving image display device and image display device
JP2009069484A (en) * 2007-09-13 2009-04-02 Sony Corp Display device, and display driving method
JP2009069485A (en) * 2007-09-13 2009-04-02 Sony Corp Display device, and display driving method
JP2009186978A (en) * 2008-02-01 2009-08-20 Samsung Mobile Display Co Ltd Organic light emitting display and driving method thereof
US8633877B2 (en) 2008-02-01 2014-01-21 Samsung Display Co., Ltd. Organic light emitting display and driving method thereof
US20090195484A1 (en) * 2008-02-01 2009-08-06 Duk-Jin Lee Organic light emitting display and driving method thereof
EP2085956A1 (en) 2008-02-01 2009-08-05 Samsung Mobile Display Co., Ltd. Organic light emitting display and driving method thereof
JP2009258356A (en) * 2008-04-16 2009-11-05 Seiko Epson Corp Image display apparatus, voltage control method and computer program
US8686986B2 (en) 2008-04-16 2014-04-01 Seiko Epson Corporation Image display apparatus and voltage control method
JP2009282158A (en) * 2008-05-20 2009-12-03 Samsung Electronics Co Ltd Display device
KR101022106B1 (en) * 2008-08-06 2011-03-17 삼성모바일디스플레이주식회사 Organic ligth emitting display
US8269703B2 (en) 2008-08-06 2012-09-18 Samsung Display Co., Ltd. Organic light emitting display device
JP2011034036A (en) * 2009-07-30 2011-02-17 Samsung Mobile Display Co Ltd Organic light emitting display device and driving voltage setting method thereof
US8766966B2 (en) 2009-07-30 2014-07-01 Samsung Display Co., Ltd. Organic light emitting display device and driving voltage setting method thereof
US9136754B2 (en) 2009-08-18 2015-09-15 Samsung Display Co., Ltd. Power supply device, display device including the power supply device, and driving method using the same
KR101107161B1 (en) * 2009-08-18 2012-01-25 삼성모바일디스플레이주식회사 Power supply device, display device comprising the power supply device and driving method using the same
JP2011039471A (en) * 2009-08-18 2011-02-24 Samsung Mobile Display Co Ltd Power supply device, display device including the same, and its driving method
JP2012198547A (en) * 2009-08-18 2012-10-18 Samsung Mobile Display Co Ltd Power supply device, display device including the same, and driving method of the same
US9818376B2 (en) 2009-11-12 2017-11-14 Ignis Innovation Inc. Stable fast programming scheme for displays
US9024920B2 (en) 2009-11-12 2015-05-05 Panasonic Intellectual Property Management Co., Ltd. Drive voltage generator
CN102414732A (en) * 2009-11-12 2012-04-11 松下电器产业株式会社 Drive voltage generating circuit
US8890779B2 (en) 2009-11-17 2014-11-18 Samsung Display Co., Ltd. Organic light emitting display for varying the voltages of the cathode electrodes based on the magnitude of the signal data and driving method thereof
KR101064370B1 (en) 2009-11-17 2011-09-14 삼성모바일디스플레이주식회사 Organic light emitting display and driving method thereof
US8687025B2 (en) 2009-11-19 2014-04-01 Samsung Display Co., Ltd. Display device and driving method thereof
JP2011107677A (en) * 2009-11-19 2011-06-02 Samsung Mobile Display Co Ltd Display device and method for driving the same
CN102074182B (en) * 2009-11-19 2015-01-21 三星显示有限公司 Display device and driving method thereof
CN102074182A (en) * 2009-11-19 2011-05-25 三星移动显示器株式会社 Display apparatus and driving method thereof
JP2013513132A (en) * 2009-12-06 2013-04-18 イグニス・イノベイション・インコーポレーテッドIgnis Innovation Incorporated Power saving system and method for AMOLED pixel driver
US9058772B2 (en) 2010-01-13 2015-06-16 Joled Inc. Display device and driving method thereof
US8593448B2 (en) 2010-05-06 2013-11-26 Samsung Display Co., Ltd. Organic light emitting display and method of driving the same
US9761172B2 (en) 2010-05-12 2017-09-12 Samsung Display Co., Ltd. Organic light emitting diode display device and driving method thereof
WO2012001990A1 (en) * 2010-07-02 2012-01-05 パナソニック株式会社 Display device and driving method thereof
US9019323B2 (en) 2010-07-02 2015-04-28 Joled, Inc. Display device and method for driving display device
JP5793141B2 (en) * 2010-07-02 2015-10-14 株式会社Joled Display device and driving method thereof
WO2012001991A1 (en) * 2010-07-02 2012-01-05 パナソニック株式会社 Display device and method for driving same
JP5788876B2 (en) * 2010-07-02 2015-10-07 株式会社Joled Display device and driving method thereof
US8933923B2 (en) 2010-07-02 2015-01-13 Panasonic Corporation Display device and method for driving display device
WO2012077258A1 (en) * 2010-12-10 2012-06-14 パナソニック株式会社 Display device and driving method therefor
US8866807B2 (en) 2010-12-10 2014-10-21 Panasonic Corporation Display device and method of driving the same
JP5770726B2 (en) * 2010-12-10 2015-08-26 株式会社Joled Display device and driving method thereof
JP2012194531A (en) * 2011-03-14 2012-10-11 Samsung Mobile Display Co Ltd Active matrix display device and driving method for the same
US10249237B2 (en) 2011-05-17 2019-04-02 Ignis Innovation Inc. Systems and methods for display systems with dynamic power control
CN105869575A (en) * 2011-05-17 2016-08-17 伊格尼斯创新公司 METHODS FOR DISPLAY operation
EP2710578A4 (en) * 2011-05-17 2015-04-22 Ignis Innovation Inc Systems and methods for display systems with dynamic power control
US9606607B2 (en) 2011-05-17 2017-03-28 Ignis Innovation Inc. Systems and methods for display systems with dynamic power control
EP2710578A1 (en) * 2011-05-17 2014-03-26 Ignis Innovation Inc. Systems and methods for display systems with dynamic power control
WO2012156942A1 (en) 2011-05-17 2012-11-22 Ignis Innovation Inc. Systems and methods for display systems with dynamic power control
US9134825B2 (en) 2011-05-17 2015-09-15 Ignis Innovation Inc. Systems and methods for display systems with dynamic power control
US8952952B2 (en) 2011-06-16 2015-02-10 Panasonic Corporation Display device
WO2012172607A1 (en) 2011-06-16 2012-12-20 パナソニック株式会社 Display device
CN102959611A (en) * 2011-06-16 2013-03-06 松下电器产业株式会社 The display device
US9185751B2 (en) 2011-06-16 2015-11-10 Joled Inc. Display device
WO2012172604A1 (en) 2011-06-16 2012-12-20 パナソニック株式会社 Display device
US9275572B2 (en) 2011-06-23 2016-03-01 Joled Inc. Display device and display device driving method for causing reduction in power consumption
CN102971781A (en) * 2011-07-06 2013-03-13 松下电器产业株式会社 The display device
WO2013005257A1 (en) * 2011-07-06 2013-01-10 パナソニック株式会社 Display device
CN102971781B (en) * 2011-07-06 2015-09-16 株式会社日本有机雷特显示器 Display device
JPWO2013005257A1 (en) * 2011-07-06 2015-02-23 パナソニック株式会社 display device
US8941638B2 (en) 2011-07-06 2015-01-27 Panasonic Corporation Display device
WO2013008270A1 (en) * 2011-07-11 2013-01-17 パナソニック株式会社 Display device
JPWO2013008270A1 (en) * 2011-07-11 2015-02-23 パナソニック株式会社 display device
CN102971780A (en) * 2011-07-11 2013-03-13 松下电器产业株式会社 The display device
US8952953B2 (en) 2011-07-11 2015-02-10 Panasonic Corporation Display device
US8803869B2 (en) 2011-07-12 2014-08-12 Panasonic Corporation Display device and method of driving display device
WO2013008272A1 (en) 2011-07-12 2013-01-17 パナソニック株式会社 Display device and method for driving display device
CN103038809B (en) * 2011-07-12 2016-01-06 株式会社日本有机雷特显示器 Display device
JPWO2013008272A1 (en) * 2011-07-12 2015-02-23 パナソニック株式会社 Display device and driving method of display device
WO2013008271A1 (en) 2011-07-12 2013-01-17 パナソニック株式会社 Display device
US9105231B2 (en) 2011-07-12 2015-08-11 Joled Inc. Display device
CN103038809A (en) * 2011-07-12 2013-04-10 松下电器产业株式会社 The display device
JPWO2013008271A1 (en) * 2011-07-12 2015-02-23 パナソニック株式会社 display device
US9224954B2 (en) 2011-08-03 2015-12-29 Ignis Innovation Inc. Organic light emitting diode and method of manufacturing
US10079269B2 (en) 2011-11-29 2018-09-18 Ignis Innovation Inc. Multi-functional active matrix organic light-emitting diode display
US9385169B2 (en) 2011-11-29 2016-07-05 Ignis Innovation Inc. Multi-functional active matrix organic light-emitting diode display
US9818806B2 (en) 2011-11-29 2017-11-14 Ignis Innovation Inc. Multi-functional active matrix organic light-emitting diode display
US10453904B2 (en) 2011-11-29 2019-10-22 Ignis Innovation Inc. Multi-functional active matrix organic light-emitting diode display
WO2013094104A1 (en) * 2011-12-20 2013-06-27 パナソニック株式会社 Display device and drive method for same
US9595225B2 (en) 2011-12-20 2017-03-14 Joled Inc. Display device and method of driving the same
JPWO2013094104A1 (en) * 2011-12-20 2015-04-27 パナソニック株式会社 Display device and driving method thereof
US9934725B2 (en) 2013-03-08 2018-04-03 Ignis Innovation Inc. Pixel circuits for AMOLED displays
US9952698B2 (en) 2013-03-15 2018-04-24 Ignis Innovation Inc. Dynamic adjustment of touch resolutions on an AMOLED display
US9620057B2 (en) 2013-08-16 2017-04-11 Boe Technology Group Co., Ltd. Method and apparatus for adjusting driving voltage for pixel circuit, and display device
JP2016530560A (en) * 2013-08-16 2016-09-29 京東方科技集團股▲ふん▼有限公司Boe Technology Group Co.,Ltd. Method for adjusting drive voltage of pixel circuit, adjusting device therefor, and display device
WO2015021721A1 (en) * 2013-08-16 2015-02-19 京东方科技集团股份有限公司 Method for regulating driving voltage of pixel circuit, regulating apparatus thereof, and display device
US9734758B2 (en) 2013-10-18 2017-08-15 Joled Inc. Display device and method for driving same
US9502653B2 (en) 2013-12-25 2016-11-22 Ignis Innovation Inc. Electrode contacts
US9831462B2 (en) 2013-12-25 2017-11-28 Ignis Innovation Inc. Electrode contacts
US10176752B2 (en) 2014-03-24 2019-01-08 Ignis Innovation Inc. Integrated gate driver
US10121411B2 (en) 2014-11-20 2018-11-06 Joled Inc. Display device and display method for reducing power consumption of a source driver
US9842889B2 (en) 2014-11-28 2017-12-12 Ignis Innovation Inc. High pixel density array architecture
US10170522B2 (en) 2014-11-28 2019-01-01 Ignis Innovations Inc. High pixel density array architecture
US10373554B2 (en) 2015-07-24 2019-08-06 Ignis Innovation Inc. Pixels and reference circuits and timing techniques
US10410579B2 (en) 2015-07-24 2019-09-10 Ignis Innovation Inc. Systems and methods of hybrid calibration of bias current
JP2018531425A (en) * 2015-10-13 2018-10-25 深▲セン▼市華星光電技術有限公司 Method and system for improving contrast ratio of OLED display panel
US10204540B2 (en) 2015-10-26 2019-02-12 Ignis Innovation Inc. High density pixel pattern
WO2019187062A1 (en) * 2018-03-30 2019-10-03 シャープ株式会社 Method for driving display device and display device

Also Published As

Publication number Publication date
JP4622389B2 (en) 2011-02-02

Similar Documents

Publication Publication Date Title
TWI310173B (en)
JP4804711B2 (en) Image display device
US7061452B2 (en) Spontaneous light-emitting display device
DE60110664T2 (en) Active control circuit for display fields
JP5611312B2 (en) Organic light emitting diode display device and driving method thereof
JP3854161B2 (en) display device
TWI286305B (en) Display device
US7557783B2 (en) Organic light emitting display
JP4963013B2 (en) Display device
US6777888B2 (en) Drive circuit to be used in active matrix type light-emitting element array
DE60123344T2 (en) Active matrix self-emitting display and active matrix organic electroluminescent display
JP4551692B2 (en) Display pixel structure and driving method thereof
JP2005004173A (en) Electro-optical device and its driver
US7750875B2 (en) Organic light-emitting diode display device and driving method thereof
JP5080733B2 (en) Display device and driving method thereof
JP4398413B2 (en) Pixel drive circuit with threshold voltage compensation
US20070285359A1 (en) Display apparatus
US7889160B2 (en) Organic light-emitting diode display device and driving method thereof
US20070008297A1 (en) Method and apparatus for image based power control of drive circuitry of a display pixel
JP5078236B2 (en) Display device and driving method thereof
JP4916642B2 (en) Display device and control method thereof
JP2007286614A (en) Image display system
CN100481177C (en) Electro-optical device, driving method therefor, and electronic apparatus
US8564509B2 (en) Display device and driving method thereof
JP5240534B2 (en) Display device and drive control method thereof

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20070426

RD03 Notification of appointment of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7423

Effective date: 20071028

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20100715

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100720

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100910

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20101005

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20101018

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131112

Year of fee payment: 3

LAPS Cancellation because of no payment of annual fees