WO2015056446A1 - 表示装置およびその駆動方法 - Google Patents
表示装置およびその駆動方法 Download PDFInfo
- Publication number
- WO2015056446A1 WO2015056446A1 PCT/JP2014/005238 JP2014005238W WO2015056446A1 WO 2015056446 A1 WO2015056446 A1 WO 2015056446A1 JP 2014005238 W JP2014005238 W JP 2014005238W WO 2015056446 A1 WO2015056446 A1 WO 2015056446A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light emitting
- luminance signal
- voltage
- light
- level
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
Definitions
- the present invention relates to an active matrix display device using a current driven light emitting element typified by organic EL (electroluminescence), and a driving method thereof.
- the luminance of the organic EL element depends on the driving current supplied to the element, and the light emission luminance of the element increases in proportion to the driving 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 displaying an all-white image, but when displaying a general natural image, the power consumption is about 20 to 40% of the all-white image. It is enough.
- Patent Document 1 has room for further reducing the power consumption of the display device.
- the present invention has been made in view of such a problem, and an object of the present invention is to provide a display device having a high power consumption reduction effect and a driving method thereof.
- a display device includes a light-emitting element that emits light according to a supplied current and a driving current that corresponds to a level of a luminance signal.
- a display unit configured by arranging a plurality of light emitting pixels having a driving transistor to be supplied; a voltage source that generates a driving voltage supplied to the display unit; and the plurality of light emitting pixels and the voltage source connected to the display unit A power line for supplying the driving voltage from the voltage source to each of the light emitting pixels, and video data that is data indicating the light emission luminance of each of the plurality of light emitting pixels.
- a voltage drop amount estimation unit that estimates a voltage drop amount generated up to each light emitting pixel, and a luminance that the light emitting element emits when the drive transistor operates in both a linear region and a saturation region.
- a first storage unit storing correction information representing a relationship between the level of the luminance signal and the luminance of the light emitting element and the level of the luminance signal when the driving transistor operates in a saturation region;
- a second storage unit that stores reference characteristic information representing a relationship between the reference signal and a reference level that is a level of the luminance signal corresponding to the light emission luminance indicated by the video data based on the reference characteristic information,
- a luminance signal correction unit that generates the luminance signal at a level corrected by performing correction based on the correction information according to the estimated voltage drop amount.
- the operating characteristic in the saturation region can be obtained by simulation using the luminance signal whose level is corrected.
- the driving voltage supplied to each light emitting pixel can be reduced to such a level that the driving transistor operates in a linear region, and the light emitting element can emit light accurately with a desired luminance.
- a display device with a high reduction effect can be obtained.
- FIG. 1 is a functional block diagram illustrating an example of a configuration of a display device according to an embodiment.
- FIG. 2 is an example of an equivalent circuit of a power supply line.
- FIG. 3 is a perspective view schematically showing the configuration of the display unit.
- FIG. 4 is a circuit diagram illustrating an example of a configuration of a light emitting pixel.
- FIG. 5 is a diagram for explaining the operating point of the light emitting pixel.
- FIG. 6 is a diagram illustrating the light emission characteristics of the light emitting pixels.
- FIG. 7 is a diagram for explaining the concept of luminance signal correction processing.
- FIG. 8 is a flowchart illustrating an example of the operation of the display device.
- FIG. 9 is a diagram illustrating an example of the reference characteristic information.
- FIG. 1 is a functional block diagram illustrating an example of a configuration of a display device according to an embodiment.
- FIG. 2 is an example of an equivalent circuit of a power supply line.
- FIG. 3 is
- FIG. 10 is a diagram illustrating an example of the correction information.
- FIG. 11 is a diagram illustrating an example of the correction information.
- FIG. 12 is a diagram for explaining the effect of the luminance signal correction processing.
- FIG. 13 is an external view illustrating an example of a television receiver to which the display device in the embodiment is applied.
- Patent Document 2 International Publication No. 2012/001991
- the display device described in Patent Document 2 estimates the distribution of the voltage drop amount generated in the power supply line for each light emitting pixel from the video data indicating the light emission luminance of each of the plurality of light emitting pixels.
- the drive voltage supplied to the power supply line is adjusted based on the distribution of the voltage drop amount for each light emitting pixel.
- the margin added to the drive voltage can be reduced in accordance with the video data that is actually displayed, so that the effect of suppressing the power consumption of the display device to a higher degree can be obtained.
- a driving transistor that supplies a driving current for an organic EL element is operated in a so-called constant current in a saturation region.
- the influence of the source-drain voltage of the drive transistor on the drive current is suppressed, so that the drive current is accurately controlled depending only on the gate-source voltage of the drive transistor. That is, the organic EL can emit light with a desired luminance.
- the driving transistor can operate in the linear region, the driving voltage supplied to the power supply line can be further reduced, which is useful for suppressing the power consumption of the display device.
- the driving transistor when the driving transistor is operated in a linear region, the influence of the source-drain voltage of the driving transistor on the driving current of the organic EL element becomes obvious. There is a concern that it will not be possible to emit light accurately at a brightness of.
- a display device includes a light-emitting element that emits light according to a supplied current and a driving current that corresponds to a level of a luminance signal.
- a display unit configured by arranging a plurality of light emitting pixels having a driving transistor to be supplied to the element; a voltage source that generates a driving voltage supplied to the display unit; the plurality of light emitting pixels and the voltage source And a power line for supplying the driving voltage from the voltage source to each light emitting pixel, and video data that is data indicating the light emission luminance of each of the plurality of light emitting pixels, and the voltage at the power line
- the drive transistor operates in both the linear region and the saturation region, the light emitting element emits light.
- a first storage unit that stores correction information representing a relationship between the luminance of the luminance signal and the level of the luminance signal; and the luminance of the light emitting element and the luminance when the driving transistor operates in a saturation region
- a second storage unit storing reference characteristic information representing a relationship between the signal level and a reference that is a level of the luminance signal corresponding to the light emission luminance indicated by the video data based on the reference characteristic information
- a luminance signal correction unit that generates the luminance signal at a level corrected by correcting the level based on the correction information according to the estimated voltage drop amount.
- the driving transistor operates in the linear region, it is possible to obtain the operating characteristic in the saturation region in a simulated manner by the luminance signal whose level is corrected.
- the driving voltage supplied to each light emitting pixel can be reduced to such a level that the driving transistor operates in a linear region, and the light emitting element can emit light accurately with a desired luminance.
- a display device with a high reduction effect can be obtained.
- the first storage unit stores the correction information corresponding to each of a plurality of different voltage drop amounts
- the luminance signal correction unit is a voltage estimated by the voltage drop amount estimation unit.
- the luminance signal may be generated by correcting the reference level using correction information corresponding to a drop amount.
- the first storage unit includes a level of the luminance signal for causing the light emitting element to emit light with a predetermined luminance when the driving transistor operates in both a linear region and a saturation region, and the driving transistor.
- the correction information the information indicating the correspondence with the level of the luminance signal for causing the light emitting element to emit light at the predetermined luminance when operating in the saturation region, the luminance signal correction unit,
- the luminance signal may be generated at a level of the luminance signal corresponding to the reference level according to the correction information.
- the light emitting element can emit light with the same luminance regardless of whether the driving transistor operates in a linear region or a saturation region.
- a disclosed driving method is a driving method of a display device, and the display device includes a light emitting element that emits light according to a supplied current and a level of a luminance signal.
- a display unit configured by arranging a plurality of light emitting pixels including a driving transistor that supplies a driving current corresponding to the light emitting element, a voltage source that generates a driving voltage supplied to the display unit, and A power supply line connected to a plurality of light emitting pixels and the voltage source and supplying the driving voltage from the voltage source to the light emitting pixels, a voltage drop amount estimation unit, and the drive transistor both in a linear region and a saturation region
- a first storage unit storing correction information representing a relationship between the luminance emitted by the light emitting element and the level of the luminance signal, and when the driving transistor operates in a saturation region.
- a second storage unit storing reference characteristic information representing a relationship between the luminance emitted by the light emitting element and the level of the luminance signal; and a luminance signal correction unit, wherein the driving method includes the voltage
- the drop amount estimation unit estimates the voltage drop amount generated from the voltage source to each of the light emitting pixels in the power supply line using video data that is data indicating the light emission luminance of each of the plurality of light emitting pixels.
- the luminance signal correction unit corrects the level of the luminance signal corresponding to the light emission luminance indicated by the video data based on the reference characteristic information based on the correction information based on the estimated voltage drop amount. By doing so, the luminance signal is generated.
- the driving transistor operates in the linear region, the operating characteristic in the saturation region can be obtained by simulation using the luminance signal whose level is corrected.
- the driving voltage supplied to each light emitting pixel can be reduced to such a level that the driving transistor operates in a linear region, so that a display device driving method with high power consumption reduction effect can be obtained.
- FIG. 1 is a block diagram illustrating an example of a functional configuration of a display device according to an embodiment.
- a display device 100 shown in FIG. 1 is a device that displays an image according to image data that is data indicating the light emission luminance of each of a plurality of light emitting pixels, and includes a display unit 110, power supply lines 112 and 113, and a data line driver. 120, a data line 122, a write scan driver 130, a scan line 123, a controller 140, a voltage drop amount estimation unit 150, a luminance signal correction unit 160, a voltage source 170, and a first storage unit 181. , A second storage unit 182.
- the display unit 110 includes a plurality of light emitting elements each having a light emitting element that emits light according to a supplied current and a driving transistor that supplies a driving current according to a level of a luminance signal given from the outside to the light emitting element.
- the pixels 111 are arranged.
- the plurality of light emitting pixels 111 may be arranged in a matrix.
- the voltage source 170 generates a driving voltage supplied to the display unit 110.
- the power lines 112 and 113 are connected to the light emitting pixels 111 and the voltage source 170, and supply the driving voltage from the voltage source 170 to each light emitting pixel 111 of the display unit 110.
- the data line 122 is provided for each column, and the plurality of light emitting pixels 111 located in the same column are connected to the data line driver 120 via the data line 122 provided in the column.
- the scanning line 123 is provided for each row, and the plurality of light emitting pixels 111 located in the same row are connected to the writing scanning driver 130 via the scanning line 123 provided in the row.
- the voltage drop amount estimation unit 150 estimates the voltage drop amount generated from the voltage source 170 to each light emitting pixel 111 in at least one of the power supply lines 112 and 113 using the video data.
- the first storage unit 181 stores correction information representing a relationship between the level of the luminance signal and the luminance of the light emitting element when the driving transistor operates in a linear region in the light emitting pixel 111.
- the second storage unit 182 stores reference characteristic information indicating a relationship between the level of the luminance signal and the luminance of the light emitting element when the driving transistor operates in a saturation region in the light emitting pixel 111.
- the luminance signal correction unit 160 converts a reference level that is a level of the luminance signal corresponding to the light emission luminance indicated by the video data based on the reference characteristic information into the correction information according to the estimated voltage drop amount. Based on the correction, the luminance signal of each column is generated at the corrected level.
- the data line driver 120 outputs the generated luminance signal to the data line 122 in the corresponding column.
- the write scanning driver 130 sequentially outputs scanning signals to the scanning lines 123 for each row.
- the controller 140 instructs the drive timing to each of the data line driver 120 and the write scan driver 130.
- the light emitting pixel 111 uses the driving voltage supplied from the power supply lines 112 and 113 as a power supply, and the luminance according to the level of the luminance signal supplied from the data line driver 120. Flashes on. As a result, a video is displayed on the display unit 110 according to the video data.
- FIG. 2 is an example of an equivalent circuit of the power supply line 112.
- the resistance component of the power supply line 112 between the connection points between the light emitting pixels 111 adjacent in the column direction and the power supply line 112 is represented by Rah, and the connection point between the light emitting pixels 111 adjacent in the row direction and the power supply line 112.
- the resistance component of the power supply line 112 between them is represented by Rav.
- a driving voltage is applied from the voltage source 170 to the outer periphery of the power supply line 112.
- the power line 112 is provided in the display unit 110 in which the light emitting pixels 111 are arranged in a matrix having a size of 1920 columns and 1080 rows, and a driving voltage applied from the voltage source 170 is applied to each light emitting pixel 111. Can be supplied.
- the column number is represented by h and the row number is represented by v.
- the driving voltage is a power source for each light emitting pixel 111 to emit light, and may be constituted by, for example, an anode voltage and a cathode voltage lower than the anode voltage.
- an anode voltage is supplied from the voltage source 170 to each light emitting pixel 111 via the power supply line 112
- a cathode voltage is supplied to the power supply line 113 represented by an equivalent circuit similar to the power supply line 112 from the voltage source 170. It may be supplied to each light emitting pixel 111 via.
- the cathode voltage may be a common ground voltage for the display device 100.
- the power supply lines 112 and 113 may be a wiring network formed by patterning a conductive material or a solid film made of a transparent conductive material.
- FIG. 3 is a perspective view schematically showing the configuration of the display unit 110.
- the display unit 110 includes a plurality of light emitting pixels 111 and power supply lines 112 and 113.
- the voltage at the connection point between the luminescent pixel 111 and the power supply line 112 is represented by va (h, v)
- the voltage at the connection point between the luminescent pixel 111 and the power supply line 113 is vc.
- the current flowing through the light emitting pixel 111 is represented by i (h, v).
- the power supply line 113 is also described by an equivalent circuit using resistance components Rch and Rcv between connection points between the adjacent light emitting pixels 111 and the power supply line 113.
- Each light emitting pixel 111 emits light with luminance corresponding to the amount of current flowing using the driving voltage supplied from the power supply lines 112 and 113 as a power supply.
- FIG. 4 is a circuit diagram showing an example of the configuration of the light emitting pixel 111.
- the light emitting pixel 111 includes a light emitting element 121, a selection transistor 124, a driving transistor 125, and a storage capacitor 126.
- the light emitting element 121 is an element that emits light in response to a current supplied from the driving transistor 125, and may be composed of, for example, an organic EL element.
- the selection transistor 124 is turned on in response to the scanning signal supplied from the writing scanning driver 130 via the scanning line 123, thereby receiving the luminance signal supplied from the data line driver 120 via the data line 122.
- it may be composed of a thin film transistor.
- the drive transistor 125 is an element that supplies a drive current corresponding to the level of the luminance signal stored in the storage capacitor 126 to the light emitting element 121, and may be formed of, for example, a thin film transistor.
- the configuration of the light-emitting pixel 111 shown in FIG. 4 is an example, and is not essential.
- the light-emitting pixel 111 includes a circuit in which a light-emitting element 121 and a driving transistor 125 are connected in series.
- a driving voltage is supplied from both power supply lines 112 and 113 to both ends of the circuit, and the driving voltage is used as a power source.
- the selection transistor 124 and the driving transistor 125 may be configured by either a P-type transistor or an N-type transistor depending on the polarities of the scanning signal and the luminance signal, respectively.
- the light emitting element 121 may be connected in the direction opposite to the direction shown in FIG. 4 according to the drive voltage supplied from the power supply lines 112 and 113.
- FIG. 5 is a diagram for explaining the operating point of the light emitting pixel 111, and shows the current-voltage characteristics of the light emitting element 121 and the driving transistor 125, respectively. In the following, for simplicity of explanation, it is assumed that the luminance signal and the gate-source voltage of the driving transistor 125 are equal.
- FIG. 5 shows the relationship between the drain current and the source-drain voltage for each of a plurality of different gate-source voltages as the current-voltage characteristics of the drive transistor 125.
- the drive transistor 125 can operate in both a linear region where the drain current depends on the source-drain voltage and the source-gate voltage, and a saturation region where the drain current substantially depends only on the source-gate voltage.
- the plurality of drive voltages are represented in association with voltage drop amounts generated from the voltage source 170 to the light emitting pixels 111 in the power supply lines 112 and 113.
- the light emitting pixel 111 is an operating point that is an intersection of the characteristic curve of the light emitting element 121 corresponding to the driving voltage applied to the light emitting pixel 111 and the characteristic curve of the driving transistor 125 corresponding to the luminance signal applied to the light emitting pixel 111. Operate. The lower the drive voltage, that is, the greater the amount of voltage drop that occurs in the power supply lines 112 and 113, the easier the operating point of the light emitting pixel 111 enters the linear region of the drive transistor 125.
- FIG. 6 is a diagram for explaining the light emission characteristics of the light emitting pixel 111, and shows the relationship between the light emission luminance of the light emitting pixel 111 and the luminance signal.
- FIG. 6 illustrates a case where the operating point of the light emitting pixel 111 is in the linear region of the driving transistor 125 and a case where the operating point of the light emitting pixel 111 is in the saturation region of the driving transistor 125 when a luminance signal equal to the light emitting pixel 111 is applied. These indicate that the emission luminances do not match.
- a drive voltage in which a voltage drop amount that can occur in the power supply lines 112 and 113 is added in advance is generated in the voltage source 170, and the power supply lines 112 and 113. To supply. This prevents the operating point of the light emitting pixel 111 from entering the linear region of the driving transistor 125.
- the drive transistor 125 can operate in the linear region, the drive voltage supplied to the power supply lines 112 and 113 can be further reduced, which is useful for suppressing the power consumption of the display device 100.
- the light emitting pixel 111 emits light with the same light emission luminance in accordance with video data representing the same light emission luminance regardless of whether the operating point of the light emitting pixel 111 is in the linear region or the saturation region of the driving transistor 125.
- the level of the luminance signal is corrected.
- FIG. 7 is a diagram for explaining the concept of luminance signal correction processing.
- the level of the luminance signal for causing the light emitting pixel 111 to emit light with a desired luminance is the reference level (point A) when the driving transistor 125 operates in the saturation region, and the driving transistor 125 is in the linear region. When operating, it is the correction level (point B).
- the desired luminance is, for example, luminance represented by video data.
- the light emitting pixel 111 by correcting the level of the luminance signal, it is possible to cause the light emitting pixel 111 to emit light with the same emission luminance regardless of whether the driving transistor 125 operates in the linear region or the saturation region.
- such correction is performed by changing the level of the luminance signal when the driving transistor 125 operates in the saturation region to the level of the light emitting pixel when the driving transistor 125 operates in the linear region according to the voltage drop amount of the driving voltage.
- the correction may be performed based on the light emission characteristics.
- FIG. 8 is a flowchart showing an example of the operation of the display device 100.
- the flowchart in FIG. 8 may be executed for each picture constituting the video represented by the video data, for example.
- step S11 the voltage drop amount estimation unit 150 uses the video data to estimate the voltage drop amount in each light emitting pixel 111 of the drive voltage.
- the voltage drop amount at each light emitting pixel 111 of the drive voltage is, for example, a voltage drop amount generated from the voltage source 170 to each light emitting pixel 111 in the power supply line 112.
- a method for estimating such a voltage drop amount is known (for example, Patent Document 2).
- the voltage drop amount estimation unit 150 uses the conversion formula or conversion table representing the relationship between the luminance value of the pixel and the pixel current to calculate each light emission from the luminance value of each pixel of one picture represented by the video data. The amount of current to be passed through the pixel 111 is specified.
- the voltage drop amount estimation unit 150 calculates the voltage distribution at the connection point between the light emitting pixel 111 and the power supply line 112 from the identified current amount of each light emitting pixel 111 as follows.
- h is an integer from 1 to 1920
- v is an integer from 1 to 1080.
- va (0, v), va (1921, v), va (h, 0), and va (h, 1081) are voltages at the outer periphery of the power supply line 112, and from the voltage source 170 to the outer periphery of the power supply line 112. By approximating the voltage drop amount up to 0 to 0, it is expressed by a constant equal to the drive voltage generated by the voltage source 170.
- Rah and Rav are resistance components between the connection points between the adjacent light emitting pixels 111 and the power supply line 112, and are constants determined based on the design value or the actual measurement value of the power supply line 112.
- These constants may be stored in advance in the voltage drop amount estimation unit 150 and referred to when estimating the voltage drop amount, for example.
- Formula 1 is established for each light emitting pixel 111 and is solved as a simultaneous equation regarding the variable va (h, v), whereby the voltage va (h, v) at the connection point between each light emitting pixel 111 and the power supply line 112 is obtained. Then, the voltage drop amount generated from the voltage source 170 to each light emitting pixel 111 in the power supply line 112 is obtained by the difference between the driving voltage output from the voltage source 170 and va (h, v).
- the voltage drop amount estimation unit 150 can obtain the voltage drop amount generated from the voltage source 170 to each light emitting pixel 111 in the power supply line 113 in the same way.
- the voltage drop amount estimation unit 150 estimates the voltage drop amount generated from the voltage source 170 to each light emitting pixel 111 in one or both of the power supply lines 112 and 113.
- step S12 the luminance signal correction unit 160 specifies the level of the luminance signal associated with the luminance value indicated by the video data by the reference characteristic information stored in the second storage unit 182 for each light emitting pixel 111.
- the reference characteristic information is information representing the relationship between the light emission luminance of the light emitting element 121 and the level of the luminance signal when the driving transistor 125 operates in the saturation region in the light emitting pixel 111.
- FIG. 9 is a diagram showing an example of the reference characteristic information.
- the reference characteristic information includes a relationship between the luminance value of the pixel indicated by the video data and the voltage value of the luminance signal as shown in FIG. 9 as an example. May be a conversion table.
- the level of the luminance signal may be an actual voltage value or a sign representing the voltage value, and the reference characteristic information may be represented by a conversion formula.
- the luminance signal correction unit 160 specifies the level of the luminance signal associated with the light emission luminance indicated by the video data for each light emitting pixel.
- the reference characteristic information includes, for example, causing each light emitting pixel 111 to emit light according to video data indicating a predetermined luminance value while applying a driving voltage that is large enough to cause the driving transistor 125 to operate in a saturation region at all light emission luminances. You may acquire by measuring light emission luminance. The light emission luminance of each light emitting pixel 111 may be measured, for example, by photographing the display unit 110 with a camera.
- step S13 the luminance signal correction unit 160 corrects the level of the specified luminance signal for each light emitting pixel based on the correction information.
- the correction information is information representing the relationship between the light emission luminance of the light emitting element 121 and the level of the luminance signal when the driving transistor 125 operates in both the linear region and the saturation region in the light emitting pixel 111.
- FIG. 10 is a diagram showing an example of the correction information.
- the correction information operates when the driving transistor 125 operates in the saturation region and in both the linear region and the saturation region.
- it may be information indicating the relationship between the reference level of the luminance signal and the correction level for the light emitting elements 121 to emit light with the same luminance. Since the relationship between the light emission luminance of the light emitting element 121 and the reference level is associated with the above-described reference characteristic information, the light emitting element when the driving transistor 125 operates in the linear region by such correction information.
- the relationship between the light emission luminance of 121 and the correction level of the luminance signal is represented.
- correction information may more directly represent the relationship between the luminance value of the pixel indicated by the video data and the correction level of the luminance signal.
- the correction information may be provided corresponding to each of a plurality of different voltage drop amounts, as shown in FIG.
- the correction information may be represented by a conversion table as shown in FIG.
- the luminance signal correction unit 160 corrects the reference level of the luminance signal corresponding to the luminance value of the pixel indicated by the video data based on the correction information according to the voltage drop amount estimated by the voltage drop amount estimation unit 150.
- step S14 the luminance signal correction unit 160 generates a luminance signal at the correction level.
- step S15 each light emitting pixel 111 emits light according to the luminance signal at the correction level.
- correction of the luminance signal may be performed only when a voltage drop amount that is not substantially zero is estimated, for example, according to the estimated voltage drop amount.
- the luminance signal may be generated at the reference level without performing such correction of the luminance signal.
- correction information corresponding to the estimated voltage drop amount may be used from among a plurality of correction information.
- FIG. 13 is an external view showing an example of a television receiver configured using the display device 100.
- a television receiver configured using the display device 100.
- an excellent power consumption reduction effect can be obtained by using the display device 100.
- the disclosed display device can be widely used for display devices such as a television receiver.
- Display apparatus 110 Display part 111 Light emitting pixel 112,113 Power supply line 120 Data line driver 121 Light emitting element 122 Data line 123 Scan line 124 Selection transistor 125 Drive transistor 126 Holding capacity 130 Write scan driver 140 Controller 150 Voltage drop amount estimation part 160 Luminance signal correction unit 170 Voltage source 181 First storage unit 182 Second storage unit
Abstract
Description
背景技術の欄において記載した表示装置に関し、特許文献2(国際公開第2012/001991号)は、次の問題を指摘している。
図1は、実施の形態における表示装置の機能的な構成の一例を示すブロック図である。
Rah×{va(h+1,v)-va(h,v)}+
Rav×{va(h,v-1)-va(h,v)}+
Rav×{va(h,v+1)-va(h,v)}=i(h,v)
・・・(式1)
110 表示部
111 発光画素
112、113 電源線
120 データ線ドライバ
121 発光素子
122 データ線
123 走査線
124 選択トランジスタ
125 駆動トランジスタ
126 保持容量
130 書込走査ドライバ
140 コントローラ
150 電圧降下量推定部
160 輝度信号補正部
170 電圧源
181 第1記憶部
182 第2記憶部
Claims (4)
- 各々が、供給される電流に応じて発光する発光素子と、輝度信号のレベルに応じた駆動電流を前記発光素子に供給する駆動トランジスタと、を有する複数の発光画素が配列されて構成される表示部と、
前記表示部に供給される駆動電圧を生成する電圧源と、
前記複数の発光画素及び前記電圧源に接続され、前記電圧源から前記各発光画素に前記駆動電圧を供給する電源線と、
前記複数の発光画素のそれぞれの発光輝度を示すデータである映像データを用いて、前記電源線において前記電圧源から前記各発光画素までに生じる電圧降下量を推定する電圧降下量推定部と、
前記駆動トランジスタが線形領域と飽和領域との双方で動作する場合に、前記発光素子が発光する輝度と前記輝度信号のレベルとの間の関係を表す補正情報を記憶している第1記憶部と、
前記駆動トランジスタが飽和領域で動作する場合の、前記発光素子が発光する輝度と前記輝度信号のレベルとの間の関係を表す基準特性情報を記憶している第2記憶部と、
前記基準特性情報に基づいて前記映像データで示される発光輝度に対応する前記輝度信号のレベルである基準レベルを、推定された前記電圧降下量に応じて前記補正情報に基づいて補正することにより補正されたレベルで前記輝度信号を生成する輝度信号補正部と、を備える、
表示装置。 - 前記第1記憶部は、異なる複数の電圧降下量のそれぞれに対応して前記補正情報を記憶しており、
前記輝度信号補正部は、前記電圧降下量推定部で推定された電圧降下量に対応する補正情報を用いて前記基準レベルを補正することにより、前記輝度信号を生成する、
請求項1に記載の表示装置。 - 前記第1記憶部は、前記駆動トランジスタが線形領域と飽和領域との双方で動作する場合に前記発光素子を所定の輝度で発光させるための前記輝度信号のレベルと、前記駆動トランジスタが飽和領域で動作する場合に前記発光素子を前記所定の輝度で発光させるための前記輝度信号のレベルとの対応を表す情報を、前記補正情報として記憶しており、
前記輝度信号補正部は、前記補正情報によって前記基準レベルに対応する前記輝度信号のレベルで、前記輝度信号を生成する、
請求項1に記載の表示装置。 - 表示装置の駆動方法であって、
前記表示装置は、
各々が、供給される電流に応じて発光する発光素子と、輝度信号のレベルに応じた駆動電流を前記発光素子に供給する駆動トランジスタと、を含む複数の発光画素が配列されて構成される表示部と、
前記表示部に供給される駆動電圧を生成する電圧源と、
前記複数の発光画素及び前記電圧源に接続され、前記電圧源から前記各発光画素に前記駆動電圧を供給する電源線と、
電圧降下量推定部と、
前記駆動トランジスタが線形領域と飽和領域との双方で動作する場合に、前記発光素子が発光する輝度と前記輝度信号のレベルとの間の関係を表す補正情報を記憶している第1記憶部と、
前記駆動トランジスタが飽和領域で動作する場合に、前記発光素子が発光する輝度と前記輝度信号のレベルとの間の関係を表す基準特性情報を記憶している第2記憶部と、
輝度信号補正部と、を備え、
前記駆動方法は、
前記電圧降下量推定部にて、前記複数の発光画素のそれぞれの発光輝度を示すデータである映像データを用いて、前記電源線において前記電圧源から前記各発光画素までに生じる電圧降下量を推定し、
前記輝度信号補正部にて、前記基準特性情報に基づいて前記映像データで示される発光輝度に対応する前記輝度信号のレベルを、推定された前記電圧降下量に応じて前記補正情報に基づいて補正することにより、前記輝度信号を生成する、
表示装置の駆動方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/909,851 US9734758B2 (en) | 2013-10-18 | 2014-10-15 | Display device and method for driving same |
JP2015542522A JP6142235B2 (ja) | 2013-10-18 | 2014-10-15 | 表示装置およびその駆動方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013217716 | 2013-10-18 | ||
JP2013-217716 | 2013-10-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015056446A1 true WO2015056446A1 (ja) | 2015-04-23 |
Family
ID=52827903
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/005238 WO2015056446A1 (ja) | 2013-10-18 | 2014-10-15 | 表示装置およびその駆動方法 |
Country Status (3)
Country | Link |
---|---|
US (1) | US9734758B2 (ja) |
JP (1) | JP6142235B2 (ja) |
WO (1) | WO2015056446A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10304379B2 (en) | 2014-05-15 | 2019-05-28 | Joled, Inc. | Display device and method for driving display device |
US10276095B2 (en) | 2014-08-21 | 2019-04-30 | Joled Inc. | Display device and method of driving display device |
CN107808649B (zh) | 2017-10-10 | 2019-07-12 | 惠科股份有限公司 | 显示面板的驱动方法及显示装置 |
WO2022240389A1 (en) * | 2021-05-10 | 2022-11-17 | Google Llc | Dynamic irc & elvss for display device |
CN114758613B (zh) * | 2022-05-07 | 2023-11-21 | 昆山国显光电有限公司 | 像素电路及其驱动方法、显示面板 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000242208A (ja) * | 1999-02-23 | 2000-09-08 | Canon Inc | 画像表示装置、電子線発生装置及びマルチ電子ビーム源の駆動装置 |
JP2006349986A (ja) * | 2005-06-16 | 2006-12-28 | Seiko Epson Corp | 電気光学装置の駆動方法及び電気光学装置並びに電子機器 |
JP2008185809A (ja) * | 2007-01-30 | 2008-08-14 | Kyocera Corp | 画像表示装置およびその駆動方法 |
JP2008281798A (ja) * | 2007-05-11 | 2008-11-20 | Hitachi Ltd | 映像表示装置 |
WO2011086597A1 (ja) * | 2010-01-13 | 2011-07-21 | パナソニック株式会社 | 表示装置及びその駆動方法 |
WO2012077258A1 (ja) * | 2010-12-10 | 2012-06-14 | パナソニック株式会社 | 表示装置及びその駆動方法 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1439518A4 (en) | 2001-09-26 | 2007-09-05 | Sanyo Electric Co | FLAT DISPLAY |
JP2003280587A (ja) | 2002-01-18 | 2003-10-02 | Semiconductor Energy Lab Co Ltd | 表示装置およびそれを使用した表示モジュール、電子機器 |
US7224333B2 (en) | 2002-01-18 | 2007-05-29 | Semiconductor Energy Laboratory Co. Ltd. | Display device and driving method thereof |
JP3995504B2 (ja) | 2002-03-22 | 2007-10-24 | 三洋電機株式会社 | 有機elディスプレイ装置 |
GB0314895D0 (en) | 2003-06-26 | 2003-07-30 | Koninkl Philips Electronics Nv | Light emitting display devices |
JP4622389B2 (ja) | 2004-08-30 | 2011-02-02 | ソニー株式会社 | 表示装置及びその駆動方法 |
US7872619B2 (en) | 2006-11-01 | 2011-01-18 | Global Oled Technology Llc | Electro-luminescent display with power line voltage compensation |
US8427405B2 (en) | 2007-01-30 | 2013-04-23 | Lg Display Co., Ltd. | Image display device and method of driving the same |
JP2009031451A (ja) * | 2007-07-25 | 2009-02-12 | Eastman Kodak Co | 表示装置 |
JP2009210600A (ja) * | 2008-02-29 | 2009-09-17 | Canon Inc | 画像表示装置とその補正回路、および、画像表示装置の駆動方法 |
JP5793141B2 (ja) | 2010-07-02 | 2015-10-14 | 株式会社Joled | 表示装置およびその駆動方法 |
-
2014
- 2014-10-15 WO PCT/JP2014/005238 patent/WO2015056446A1/ja active Application Filing
- 2014-10-15 US US14/909,851 patent/US9734758B2/en active Active
- 2014-10-15 JP JP2015542522A patent/JP6142235B2/ja active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000242208A (ja) * | 1999-02-23 | 2000-09-08 | Canon Inc | 画像表示装置、電子線発生装置及びマルチ電子ビーム源の駆動装置 |
JP2006349986A (ja) * | 2005-06-16 | 2006-12-28 | Seiko Epson Corp | 電気光学装置の駆動方法及び電気光学装置並びに電子機器 |
JP2008185809A (ja) * | 2007-01-30 | 2008-08-14 | Kyocera Corp | 画像表示装置およびその駆動方法 |
JP2008281798A (ja) * | 2007-05-11 | 2008-11-20 | Hitachi Ltd | 映像表示装置 |
WO2011086597A1 (ja) * | 2010-01-13 | 2011-07-21 | パナソニック株式会社 | 表示装置及びその駆動方法 |
WO2012077258A1 (ja) * | 2010-12-10 | 2012-06-14 | パナソニック株式会社 | 表示装置及びその駆動方法 |
Also Published As
Publication number | Publication date |
---|---|
JP6142235B2 (ja) | 2017-06-07 |
US9734758B2 (en) | 2017-08-15 |
JPWO2015056446A1 (ja) | 2017-03-09 |
US20160232842A1 (en) | 2016-08-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9478156B2 (en) | Organic light emitting display device and driving method thereof | |
KR101894768B1 (ko) | 액티브 매트릭스 디스플레이 장치 및 그 구동 방법 | |
US9847056B2 (en) | Picture signal processing circuit, picture signal processing method, and display unit | |
KR101178910B1 (ko) | 유기전계발광 표시장치 및 이의 구동전압 설정방법 | |
US20170186373A1 (en) | Display device and method for driving same | |
KR100804529B1 (ko) | 유기 발광 디스플레이 장치 및 그의 구동 방법 | |
US10276095B2 (en) | Display device and method of driving display device | |
JP4844602B2 (ja) | 表示装置、表示制御装置、および表示制御方法、並びにプログラム | |
US20170039946A1 (en) | Oled display device and method for corecting image sticking of oled display device | |
JP6142235B2 (ja) | 表示装置およびその駆動方法 | |
US10141020B2 (en) | Display device and drive method for same | |
KR20140133189A (ko) | 유기 발광 표시 장치의 화소 및 유기 발광 표시 장치 | |
TW200713156A (en) | Display device and method of driving the same | |
JP2014224904A (ja) | 電気光学装置およびその駆動方法 | |
JP6472783B2 (ja) | 表示装置、光学補償システムおよび光学補償方法 | |
CN110634442A (zh) | Oled显示装置及其驱动方法 | |
US9001099B2 (en) | Image display and image display method | |
KR102182382B1 (ko) | 유기발광소자표시장치 및 그 구동방법 | |
JP2009258301A (ja) | 表示装置 | |
KR101101554B1 (ko) | 액티브 유기 발광 표시장치 | |
JP5814705B2 (ja) | 表示装置 | |
WO2020202260A1 (ja) | 表示装置およびその駆動方法 | |
KR102366300B1 (ko) | 유기발광표시장치 및 그의 불량서브화소를 검출하는 방법 | |
KR20210082847A (ko) | 유기 발광 표시 장치 및 유기 발광 표시 장치의 구동 방법 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14854445 Country of ref document: EP Kind code of ref document: A1 |
|
DPE2 | Request for preliminary examination filed before expiration of 19th month from priority date (pct application filed from 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 14909851 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 2015542522 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 14854445 Country of ref document: EP Kind code of ref document: A1 |