WO2015104777A1 - 表示装置および表示方法 - Google Patents
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- WO2015104777A1 WO2015104777A1 PCT/JP2014/006434 JP2014006434W WO2015104777A1 WO 2015104777 A1 WO2015104777 A1 WO 2015104777A1 JP 2014006434 W JP2014006434 W JP 2014006434W WO 2015104777 A1 WO2015104777 A1 WO 2015104777A1
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- 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]
- G09G3/3266—Details of drivers for scan electrodes
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- 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
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
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- 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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0202—Addressing of scan or signal lines
- G09G2310/0213—Addressing of scan or signal lines controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
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- 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
- G09G2330/04—Display protection
- G09G2330/045—Protection against panel overheating
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- 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
Definitions
- the present disclosure relates to a display device and a display method, and more particularly, to a display device and a display method using an organic electroluminescence (EL) element.
- EL organic electroluminescence
- an organic EL display using an organic electroluminescence element (hereinafter referred to as an organic EL element) is known.
- This organic EL display has the advantages of good viewing angle characteristics and low power consumption.
- the organic EL display includes a plurality of scanning lines (a plurality of gate signal lines), a plurality of signal lines (a plurality of source signal lines), a plurality of display pixels, a drive circuit, and the like.
- Each of the plurality of display pixels is disposed at an intersection of the gate signal line and the source signal line, and includes a switching element, a capacitor element (capacitor), a drive transistor, an organic EL element, and the like (for example, Patent Documents 1 to 5). Reference 2).
- a source driver IC (circuit) that outputs a video signal or the like is disposed in order to control the light emission luminance of a selected pixel.
- a source driver IC (circuit) applies a video signal to a source signal line.
- an on voltage or an off voltage is applied to the gate signal line connected to the selected pixel in order to control the light emission timing of the selected pixel.
- organic EL displays tend to have higher definition and larger screens.
- an organic EL display using a large screen size and high-definition display panel tends to increase the load capacity of the source signal line and increase the writing speed. If the load capacity of the source signal line is large and the writing speed is high, the amount of heat generated by the source driver IC (circuit) (Integrated Circuit) that drives the source signal line increases. When the heat generation amount is expected to exceed the heat resistance of the source driver IC, there is a problem that a heat dissipation mechanism is required to prevent the source driver IC from being damaged. Further, the heat generated by the source driver IC is transferred to the display area of the EL display panel, which causes a problem that the EL element of the pixel is deteriorated. The large heat dissipation mechanism increases the thickness of the panel module and cannot exhibit the characteristics of thin EL display panel (EL display).
- EL display thin EL display panel
- the present disclosure provides a display device and a display method that can reduce the amount of heat generated without degrading the image quality, omit or reduce the heat dissipation mechanism, and can configure a thin panel module.
- a display device includes a plurality of gate signal lines arranged for each row, a plurality of source signal lines arranged for each column, the plurality of gate signal lines, and the plurality of source signal lines.
- a display unit having a plurality of display pixels arranged at each of the intersections, a gate driver capable of selecting the plurality of gate signal lines in a specified order, and a voltage signal to each of the plurality of source signal lines
- a control unit that controls the plurality of display pixels, the gate driver, and the source driver, and each of the plurality of display pixels includes a light emitting element that emits light according to a drive current;
- a driving transistor that supplies the driving current according to the size of the load to the light emitting element, writing the voltage signal to the writing capacitor, and the light emitting element according to the charge held in the display capacitor
- the control unit is configured to perform the writing order in units of rows in the
- the display device and the display method of the present disclosure provide a display device and a display method that can reduce the amount of heat generation without deteriorating the image quality, omit or reduce the heat dissipation mechanism, and can configure a thin panel module. It becomes possible.
- FIG. 1A is an external view showing an example of an external appearance of an organic EL display.
- FIG. 1B is a block diagram illustrating an example of a configuration of an organic EL display.
- FIG. 2 is a diagram illustrating an example of the load capacity of the source signal line of the organic EL display in the comparative example.
- FIG. 3 is a table showing an example of electric power during charging / discharging of the organic EL display in the comparative example.
- FIG. 4 is a diagram showing the relationship between the luminance value of each row of the image and the output voltage of the source driver IC.
- FIG. 5 is a circuit diagram illustrating an example of a configuration of a display pixel in the embodiment.
- FIG. 6 is a block diagram illustrating an example of a configuration of a gate signal line driving circuit mounted on the gate driver IC in the embodiment.
- FIG. 7 is a block diagram illustrating an example of a functional configuration of the TCON in the embodiment.
- FIG. 8 is a flowchart for explaining the operation of TCON in the embodiment.
- FIG. 9 is a diagram illustrating an example of a frame in the embodiment.
- FIG. 10A is a graph showing the index value of each pixel row before the rearrangement of the writing order.
- FIG. 10B is a graph showing the index value of each pixel row before the rearrangement of the writing order.
- FIG. 10C is a graph showing the index value of each pixel row before the rearrangement of the writing order.
- FIG. 10A is a graph showing the index value of each pixel row before the rearrangement of the writing order.
- FIG. 10B is a graph showing the index value of each pixel row before the rearrangement of the writing order.
- FIG. 11 is a diagram showing the output power of the source driver IC when the order of frame writing shown in FIG. 4 is rearranged by the method of the first embodiment.
- FIG. 12A is a diagram illustrating a state of the switching element in the writing process.
- FIG. 12B is a diagram illustrating a state of the switching element in the reset process.
- FIG. 12C is a diagram illustrating a state of the switching element in the copy process.
- FIG. 12D is a diagram illustrating a state of the switching element in the light emission process.
- FIG. 13 is a diagram illustrating an example of a frame.
- FIG. 14A is a diagram illustrating an example of a display screen when switching frames in a comparative example.
- FIG. 14B is a diagram illustrating an example of a display screen when switching frames in the comparative example.
- FIG. 15A is a diagram illustrating an example of a display screen when switching frames in the embodiment.
- FIG. 15B is a diagram illustrating an example of a display screen when switching frames in the embodiment.
- FIG. 16 is a diagram illustrating an example of a frame including a plurality of subfields.
- FIG. 17 is a diagram illustrating an example of output power of the source driver IC in the first modification.
- FIG. 18 is a diagram illustrating an example of output power of the source driver IC in the first modification.
- FIG. 19 is a diagram illustrating an example of output power of the source driver IC in the second modification.
- FIG. 20 is a diagram illustrating an example of output power of the source driver IC in the second modification.
- FIG. 21 is a diagram illustrating an example of the rearrangement method of the writing order in the third modification.
- FIG. 22 is a diagram illustrating an example of the rearrangement method of the writing order in the fourth modification.
- FIG. 23 is a diagram illustrating an example of a method of rearranging the writing order in the fifth modification.
- FIG. 24 is a circuit diagram illustrating an example of a configuration of a display pixel in the sixth modification.
- FIG. 25A is a graph showing characteristics of the drive transistor.
- FIG. 25B is a graph showing the light emission characteristics of the EL element.
- a display panel having a large screen size such as 40 inches or more has a tendency that the load capacity of the source signal line increases and the amount of heat generation increases.
- a high-definition display panel such as a 4K2K panel (a panel having 4K ⁇ 2K or more pixels) or an 8K4K panel has a shorter selection period of one pixel row, and the video signal output from the source driver IC Since the change rate (frequency) of the source driver IC increases, the amount of heat generated by the source driver IC increases.
- the output power of the source driver IC is proportional to the capacitance C of the source signal line, the square of the voltage difference V of the video amplitude voltage, and the frequency F converted from the selection time of one pixel row.
- FIG. 1A is an external view showing an example of an external appearance of an organic EL display.
- FIG. 1B is a block diagram illustrating an example of a configuration of an organic EL display.
- EL elements composed of the three primary colors of red (R), green (G), and blue (B) are formed in a matrix.
- a color filter composed of red (R), green (G), and blue (B) can be formed.
- the color filter is not limited to RGB, and pixels of cyan (C), magenta (M), and yellow (Y) may be formed.
- white (W) pixels may be formed. That is, R, G, B, and W pixels are arranged in a matrix on the display screen.
- the pixel aperture ratios of R, G, and B may be different. By making the aperture ratios different, the current densities flowing in the RGB EL elements can be made different. By making the current densities different, the degradation rates of the RGB EL elements can be made the same. If the deterioration rate is made the same, the white balance deviation of the image display device does not occur.
- the pixel is composed of R, G, B, and W.
- R, G, B, and W high luminance can be achieved.
- configurations of R, G, B, and G are also exemplified.
- the colorization of the image display device is performed by mask vapor deposition, but the embodiment is not limited to this.
- a blue light emitting EL layer may be formed, and the emitted blue light may be converted into R, G, B light by an R, G, B color conversion layer (CCM: Color Change Mediums).
- a circularly polarizing plate (circularly polarizing film) (not shown) can be disposed on the light exit surface of the image display device. What integrated the polarizing plate and the phase film is called a circularly polarizing plate (circularly polarizing film).
- the organic EL display 100 includes an organic EL panel 10, a source driver IC 20, a PCB (Printed Circuit Board) 30, a gate driver IC 40, a PCB 50, and a TCON (timing controller) 60. Yes.
- the organic EL panel 10 has a matrix at each of a plurality of gate signal lines GL arranged for each row, a plurality of source signal lines SL arranged for each column, and intersections of the gate signal lines GL and the source signal lines SL. And a glass substrate 12 on which wirings (gate signal lines GL and source signal lines SL) that connect the display area 11 to the PCB 30 and the PCB 50 are formed. Yes.
- the display area 11 is an area for displaying an image, and the plurality of display pixels P are arranged at positions that can be visually recognized by the user.
- the display pixel P is an organic EL element that emits light according to a supplied current, and a drive that supplies a drive current according to the magnitude of a voltage signal (voltage of the source signal line SL) to the organic EL element.
- a transistor, a switching element that switches between selection and non-selection of the display pixel P, a capacitor to which a voltage signal is written, and the like are provided.
- the pixel of the EL display device in the comparative example includes a transistor, a capacitor, an EL element, and the like.
- the transistor including the driving transistor T5 and the switching element is described as a thin film transistor (TFT), but is not limited thereto.
- TFT thin film transistor
- An FET, a MOS-FET, a MOS transistor, or a bipolar transistor may be used. These are also basically thin film transistors.
- varistors, thyristors, ring diodes, photodiodes, phototransistors, PLZT elements may be used.
- the transistor is not limited to a thin film element, and may be a transistor formed on a silicon wafer.
- a transistor formed of a silicon wafer, peeled off and transferred to a glass substrate is exemplified.
- a display panel in which a transistor chip is formed using a silicon wafer and bonded to a glass substrate is exemplified.
- the transistors adopt an LDD (Lightly Doped Drain) structure for both n-type and p-type transistors.
- the transistors include high-temperature polysilicon (HTPS), low-temperature polysilicon (LTPS), continuous grain boundary silicon (CGS), and transparent silicon oxide (TAS). : Any one of those formed by Transparent Amorphous Oxide Semiconductors, amorphous silicon (AS), and infrared (RTA: rapid thermal annealing) may be used.
- HTPS high-temperature polysilicon
- LTPS low-temperature polysilicon
- CCS continuous grain boundary silicon
- TAS transparent silicon oxide
- TAS transparent Amorphous Oxide Semiconductors
- RTA rapid thermal annealing
- all the transistors constituting the pixel are p-type.
- the present invention is not limited to only the p-type transistor of the pixel. You may comprise only n-type. Moreover, you may comprise using both n-type and p-type.
- the switching element T1 is not limited to a transistor, and may be, for example, an analog switch configured using both a p-type transistor and an n-type transistor.
- the transistor preferably has a top gate structure.
- the parasitic capacitance is reduced, the gate electrode pattern of the top gate becomes a light shielding layer, and the light emitted from the EL element is blocked by the light shielding layer, so that malfunction of the transistor and off-leakage current can be reduced. is there.
- the gate signal line driven (controlled) by the gate driver IC (circuit) has a low impedance. Therefore, the same applies to the configuration or structure of the gate signal line.
- the transistor has a top gate structure and a small parasitic capacitance, so that n-type and p-type transistors can be manufactured, and a copper wiring or copper alloy wiring process can be used for the process.
- the copper wiring preferably employs a three-layer structure of Ti—Cu—Ti.
- the wiring such as the gate signal line or the source signal line preferably employs a three-layer structure of molybdenum (Mo) -Cu-Mo when the transistor is a transparent amorphous oxide semiconductor (TAOS). .
- Mo molybdenum
- TAOS transparent amorphous oxide semiconductor
- the capacitor is formed or arranged so as to overlap (overlap) at least one of the source signal line and the gate signal line.
- the degree of freedom in layout is improved, a wider space between elements can be secured, and the yield is improved.
- An insulating film or an insulating film (planarizing film) made of an acrylic material is formed on the source signal line and the gate signal line for insulation, and a pixel electrode is formed on the insulating film.
- the display pixel P corresponds to any one of the three primary colors R (red), G (green), and B (blue).
- One pixel is composed of a set of three display pixels P of RGB.
- a plurality of display pixels P constituting the same pixel are arranged adjacent to each other.
- the source driver IC 20 is configured by a COF (Chip on Film, Chip on Flexible) in which a source signal line driving circuit 21 is mounted on a flexible cable.
- COF Chip on Film, Chip on Flexible
- the source signal line drive circuit 21 applies a voltage corresponding to the voltage signal from the TCON 60 to the source signal line SL.
- the gate driver IC 40 is configured by a COF in which a gate signal line driving circuit 41 is mounted on a flexible cable.
- the gate signal line driving circuit 41 applies a voltage for turning on or off the connected switching element to each of the gate signal lines GL in accordance with the scanning signal from the TCON 60.
- FIG. 2 is a diagram illustrating an example of the load capacity of the organic EL panel 10.
- FIG. 3 is a table showing an example of power during charging and discharging in the comparative example.
- the charge / discharge capacity is determined by CV 2 F.
- C is the load capacity of the source signal line.
- V is the voltage difference (potential difference) of the output voltage.
- the applied voltage applied to the pixel corresponds to the light emission luminance of the EL element. Therefore, the voltage difference V corresponds to the voltage difference between the voltage applied to the previous pixel to be written and the voltage applied to the current pixel to be written.
- the organic EL display using a high-definition display panel tends to increase the load capacity C of the source signal line and increase the writing speed (corresponding to F). Further, since the charge / discharge capacity is proportional to the square of the voltage difference V, the influence of the voltage difference V is large.
- the output power required for a general source driver IC 20 is 2.22 W.
- the 8K4K panel has twice as many pixel rows as the 4K2K panel, so if the frame rate is the same, the driving capability required for the source driver IC 20 is twice that of the normal source driver IC 20. Therefore, it becomes about 4.5W.
- the number of source signal lines is twice that of the 4K2K panel, and the number of required source driver ICs is also doubled.
- FIG. 4 is a diagram showing the relationship between the luminance value of each row of the image and the output voltage of the source driver IC 20.
- the left side of FIG. 4 schematically shows a display image on the panel.
- FIG. 4 shows a black and white horizontal stripe image in which all pixels belonging to one pixel row are white white pixel rows and all pixels belonging to one pixel row are alternately black pixel rows.
- the right side of FIG. 4 shows the output voltage of the source signal line.
- Smin represents the minimum gradation voltage (black)
- Smax represents the maximum gradation voltage (white).
- the horizontal axis represents the output voltage of the source driver IC
- the vertical axis represents time (the downward direction is +).
- the vertical axis is an axis indicating the order of writing. Since the display image is a black and white horizontal stripe image, the voltage output from the source driver IC changes between a voltage corresponding to Smax and a voltage corresponding to Smin for each pixel row.
- the source The output voltage of the driver IC 20 is maximized.
- the potential difference V becomes maximum because it changes between the maximum voltage and the minimum voltage for each pixel row. Therefore, the power per terminal of the source driver IC is maximized.
- the amount of heat generated by the source driver IC 20 increases. If the amount of heat generation is large, the source driver IC 20 may be thermally destroyed, and normal operation may not be performed. Therefore, a heat dissipation mechanism for cooling the source driver IC is required. When the heat dissipation mechanism is provided, the number of parts that require heat dissipation of the organic EL display increases, which causes a problem that it is difficult to reduce the thickness of the panel.
- a display device includes a plurality of gate signal lines arranged for each row, a plurality of source signal lines arranged for each column, and the plurality of the plurality of source signal lines.
- a display unit having a plurality of display pixels arranged at each of intersections of a gate signal line and the plurality of source signal lines; a gate driver capable of selecting the plurality of gate signal lines in a specified order; and A source driver that outputs a voltage signal to each of the plurality of source signal lines; and a control unit that controls the plurality of display pixels, the gate driver, and the source driver, and each of the plurality of display pixels is driven
- a light-emitting element that emits light in response to a current, a writing capacitor to which the voltage signal is written, a display capacitor that can receive the charge of the writing capacitor,
- a driving transistor that supplies the light emitting element with the driving current corresponding to the magnitude of the electric charge held in the display capacitor, and writing the voltage signal to the writing capacitor,
- the light emitting element can emit light independently according to the charged electric charge
- the control unit can change the order of writing in units of rows in the display unit to two rows in which the order of writing is continuous.
- the control unit executes a rearrangement process to rearrange the voltage signals so as to reduce a difference between the plurality of gates in the order of writing after the rearrangement process by the control unit to the gate driver.
- the order of the writing is specified so that the signal lines are selected.
- the charge / discharge capacity is determined by CV 2 F, but the load capacity C and frequency F of the source signal line are determined to some extent by the specifications of the organic EL panel.
- the voltage difference (V) is suppressed by rearranging the rows to be displayed, so that the charge / discharge capability required for the source driver (referred to as “source driver IC” as appropriate) can be suppressed to a low level. become.
- a source driver IC in the form of this indication, it is not limited to the source driver IC which consists of semiconductor chips.
- a transistor formed of a silicon wafer, peeled off and transferred to a glass substrate is exemplified.
- a display panel in which a transistor chip is formed using a silicon wafer and a glass substrate is mounted by bonding is exemplified.
- a source driver circuit may be formed directly on a glass substrate on which pixels are formed using low-temperature polysilicon, high-temperature polysilicon, TAOS technology, or the like.
- a display pixel includes a writing capacitor and a display capacitor, and writing of a voltage signal and light emission of a light emitting element can be performed independently, so that light emission of a plurality of display pixels is the same. It becomes possible to do at the timing.
- the writing of the voltage signal and the light emission of the light emitting element cannot be performed independently, the row emitted by the previous voltage signal and the row emitted by the current voltage signal are mixedly displayed, and the video quality is improved. May be reduced.
- the display device having the above-described configuration it is possible to prevent a row that is emitted by the previous voltage signal and a row that is emitted by the current voltage signal from being displayed in a mixed manner. Is possible.
- the control unit may calculate an index value indicating the brightness of each row of the plurality of display pixels and rearrange the order of writing using the index value. For example, the control unit may obtain the square of the voltage signal for each of the plurality of display pixels as the index value, and obtain a total value obtained by summing the squares of the voltage signal for each row. For example, in the rearrangement process, the control unit may rearrange the index values in descending order or ascending order, and set the order of writing in the rearranged order.
- the control unit obtains the minimum value and the maximum value of the index value in the current rearrangement process in the rearrangement process, and the index of the last line in the writing order in the previous rearrangement process
- the difference between the final index value and the minimum value is smaller than the difference between the final index value and the maximum value
- the final index value that is a value is compared with the minimum value and the maximum value.
- the index values may be rearranged in ascending order, and the index values may be rearranged in descending order when the difference between the final index value and the maximum value is smaller than the difference between the final index value and the minimum value.
- the control unit sets the row for which the order of writing is not set as a search target row, and has the index value for which a difference from the index value searched last is equal to or less than a threshold value.
- the first search process may be performed in which the search target rows are sequentially searched in one direction and the write order is set in the search order.
- the control unit further sets a row for which the order of writing is not set as a search target row, and the index value that is larger or smaller than the index value searched last.
- a second search process for setting the order of writing in the search order.
- the difference in voltage signal (video voltage signal) can be reduced between two rows in which the writing order is continuous. This can reduce the output power of the source driver IC and effectively prevent the source driver IC from being thermally destroyed. Further, heat generated from the source driver can be suppressed from being transferred to the display screen, and deterioration of the EL elements of the display screen can be prevented.
- the signal output from the source driver is a voltage signal (voltage programming method), but is not limited thereto.
- it may be a current signal (current programming method).
- the current is expressed as the amplitude of the video signal, and the current difference can be regarded as a voltage difference.
- heat generation can be calculated using CV 2 F.
- each of the plurality of display pixels further includes a first switch circuit that switches between selection and non-selection of each of the plurality of display pixels, and a first switch circuit that switches connection and non-connection between the write capacitor and the display capacitor.
- a second switch circuit ; and a third switch circuit that switches connection and disconnection between the drive transistor and the light emitting element.
- the gate driver may be configured to perform the second switch during a write process of writing the voltage signal. Disconnect the circuit, make the write capacitor and the display capacitor independent, set the first switch circuit to be selected, write the voltage signal to the write capacitor, and connect the third switch circuit
- the light emitting element is set to emit light, and the voltage signal is applied to the writing capacitor.
- the first switch circuit is set to non-selection
- the third switch circuit is set to non-connection to stop light emission of the light emitting element
- the second switch circuit May be configured so that the voltage signal written to the write capacitor is written to the display capacitor.
- a display method includes a plurality of gate signal lines arranged for each row, a plurality of source signal lines arranged for each column, and the plurality of the plurality of source signal lines.
- a display unit having a plurality of display pixels arranged at each of intersections of a gate signal line and the plurality of source signal lines; a gate driver capable of selecting the plurality of gate signal lines in a specified order; and A source driver that outputs a voltage signal to each of the plurality of source signal lines; and a control unit that controls the plurality of display pixels, the gate driver, and the source driver, and each of the plurality of display pixels is driven
- a light-emitting element that emits light in response to a current, a writing capacitor to which the voltage signal is written, a display capacitor that can receive the charge of the writing capacitor,
- a driving transistor that supplies the light emitting element with the driving current corresponding to the magnitude of the electric charge held in the display capacitor, and writing the voltage signal to the writing capacitor,
- the display order is selected when the gate driver selects the gate signal line and the step of designating the write order so that the selection is performed.
- a step of controlling the display pixel so that a capacitor and the write capacitor are not electrically connected; and when the plurality of gate signal lines are not selected by the gate driver, the display capacitor and the write capacitor And controlling the display pixels so as to be electrically connected to each other.
- the above configuration defines a specific mode for independently performing voltage signal writing and light emission of the light emitting element.
- voltage signal writing and light emitting element light emission can be performed independently.
- the voltage signal of the write capacitor can be copied to the display capacitor.
- the display device of this embodiment rearranges the selection order of the gate signal lines so that the output power of the source driver IC is reduced. Further, in order to prevent the video quality from deteriorating due to the selection order of the gate signal lines, a configuration is adopted in which the writing process and the display process can be performed separately on the display pixel.
- the display device is an organic EL display.
- the basic configuration of the organic EL display of the present embodiment is the same as that of the organic EL display 100 shown in FIG. 1B, and includes an organic EL panel 10, a source driver IC 20, a PCB 30, a gate driver IC 40, a PCB 50, and a TCON 60. I have.
- the organic EL panel 10 has a matrix at each of a plurality of gate signal lines GL arranged for each row, a plurality of source signal lines SL arranged for each column, and intersections of the gate signal lines GL and the source signal lines SL.
- the display area 11 is an area for displaying an image, and the plurality of display pixels P are arranged at positions that can be visually recognized by the user.
- the display pixel P corresponds to one of the three primary colors R (red), G (green), and B (blue).
- One pixel is composed of a set of three display pixels P of RGB.
- a plurality of display pixels P constituting the same pixel are arranged adjacent to each other.
- the display pixel P of the present embodiment has a configuration in which voltage signal writing and light emission of the organic EL element can be performed independently. With this configuration, even when the selection order of the gate signal lines is varied in one frame, display switching can be performed simultaneously in all the display pixels P. For this reason, in the organic EL display according to the present embodiment, two frames are not mixedly displayed, and it is possible to prevent a reduction in video quality.
- FIG. 5 is a circuit diagram showing an example of the configuration of the display pixel P1 (P) in the present embodiment.
- the display pixel P1 includes switching elements T1 to T4, capacitors Cc and Cs, a drive transistor T5, and an organic EL element (light emitting element) OEL1.
- the switching element T1 is an example of a first switch circuit that switches between selection and non-selection of the display pixel P1, and includes a P-channel MOS transistor.
- the switching element T1 switches between conduction and non-conduction between the source signal line SL and the node N1 in accordance with a selection signal applied to the gate signal line GL1.
- Switching elements T2 to T4 are P-channel MOS transistors. Switching operation to write a voltage signal to the capacitor Cc by the switching elements T2 to T4, a reset operation to reset the capacitor Cs, a copy operation to copy the voltage signal written to the capacitor Cc to the capacitor Cs, and an organic EL element A light emitting operation for emitting light from the OEL 1 can be performed. Details will be described later.
- the switching element T2 is an example of a second switch circuit that switches between connection and non-connection of the capacitor Cc and the capacitor Cs, and conducts between the node N1 and the node N2 in accordance with a signal applied to the gate signal line GL2. And non-conducting.
- the switching element T3 switches whether to input the voltage Vref1 to the node N2, in accordance with a signal applied to the gate signal line GL3.
- the voltage Vref1 is a voltage for initializing the capacitor Cs.
- the switching element T4 is an example of a third switch circuit that switches between connection and disconnection between the drive transistor T5 and the organic EL element OEL1, and an organic EL element formed by the drive transistor T5 according to a signal applied to the gate signal line GL4. Switching between supply and non-supply of drive current to OEL1.
- the drive transistor T5 is a P-channel MOS transistor and supplies a drive current corresponding to the magnitude of the voltage signal written in the capacitor Cs to the organic EL element OEL1.
- the drive transistor T5 has a gate terminal connected to the node N2, a drain terminal connected to the anode electrode of the organic EL element OEL1, and an anode voltage VTFT input to the source terminal.
- the organic EL element OEL1 is an element that emits light according to the drive current supplied from the drive transistor T5.
- the cathode voltage VEL is input to the cathode electrode, and the anode electrode is connected to the switching element T4.
- the capacitor Cc is an example of a writing capacitor to which a voltage signal is written by the source driver IC 20, one end is connected to the node N 1, and the reference voltage Vref 1 is input to the other end.
- the capacitor Cs is an example of a display capacitor to which the voltage signal of the capacitor Cc is copied (accepts the electric charge of the capacitor Cc), and one end is connected to the node N2 and the voltage VTFT is input to the other end.
- the display pixel P1 can perform voltage signal writing and light emission of the organic EL element independently by adopting the above-described configuration. Detailed operation will be described later.
- the source driver IC 20 is configured by a COF in which a source signal line driving circuit 21 is mounted on a flexible cable. Based on the data signal from the TCON 60, the source signal line drive circuit 21 applies a voltage signal having a voltage value corresponding to the pixel value of the display pixel P1 connected to the source signal line SL to each of the source signal lines SL.
- the PCB 30 is a printed circuit board that connects the source driver IC 20 and the TCON 60.
- the gate driver IC 40 is configured by a COF in which a gate signal line driving circuit 41 is mounted on a flexible cable.
- the gate signal line drive circuit 41 applies a voltage value selection signal for turning on the switching element (transistor) of the display pixel P1 connected to the gate signal line GL to the gate signal line GL selected by the TCON 60. To do. Further, the gate signal line drive circuit 41 turns off the switching element of the display pixel P1 connected to the gate signal line GL for each of the gate signal lines GL not selected (unselected) by the TCON 60. A voltage value non-selection signal is applied.
- the gate driver IC 40 of the present embodiment is configured so that the gate signal lines to which the selection signal is applied can be specified in an arbitrary order.
- FIG. 6 is a block diagram showing an example of the configuration of the gate signal line drive circuit 41 mounted on the gate driver IC 40.
- the gate signal line driving circuit 41 includes four shift registers 221 to 224 as shown in FIG.
- a voltage Vonj for turning on the transistor, voltages Voffj and Vovd for turning off the transistor, DIR for controlling the signal direction, an enable signal ENABLEi, and a clock signal CLKi are input.
- the shift register 22i applies the voltage Vonj to the gate signal line GL specified by Selj, and applies the voltage Voffj to the other gate signal lines GL.
- PCB 50 is a printed circuit board that connects the gate driver IC 40 and the TCON 60.
- the TCON 60 is an example of a control unit that controls display of video in the display area 11.
- the V-Id curve of the drive transistor T5 is a substantially square curve with Vt as 0 point.
- FIG. 25B illustrates the relationship between the current Id flowing through the EL element and the light emission luminance B of the EL element.
- the current Ie flowing through the EL element and the light emission luminance B of the EL element have a proportional relationship.
- the gate terminal applied voltage V in FIG. 25A is the video signal voltage Vsig of the source driver IC, and the transistor current Id is the current Ie flowing through the EL element. Therefore, the video signal voltage Vsig and the light emission luminance B of the EL element are approximately square curves in a voltage range equal to or higher than Vt.
- luminance or voltage difference corresponds to a voltage or potential difference. Therefore, luminance can be replaced with voltage. Also, luminance or voltage can be converted into electric power.
- the signal output from the source driver is a voltage, and the voltage is written into the pixel and converted into a current by the driving transistor T5. This current flows to the organic EL element OEL1, and the EL element emits light to become luminance.
- the voltage output from the source driver is converted into luminance by being converted by means such as a fixed conversion coefficient, conversion equation, or conversion table. Further, the potential difference (voltage difference) is converted into a voltage difference by means of a constant conversion coefficient or conversion equation or conversion table.
- the voltage difference calculator 61 can be replaced with a voltage difference calculator.
- the conversion coefficient and the like may be set in consideration of the efficiency of the EL elements of the R, G, and B pixels. It goes without saying that the above matters can be applied to other embodiments of the present specification. Moreover, it cannot be overemphasized that it can combine with another Example.
- the TCON 60 controls each operation of the display pixel P1 described above and determines the order of writing in one frame.
- FIG. 7 is a block diagram illustrating an example of a functional configuration of the TCON 60.
- the TCON 60 includes a voltage difference calculation unit 61, a rearrangement unit 62, a gate side control unit 63, and a source side control unit 64.
- the TCON 60 is described as an example of a dedicated LSI (Large Scale Integration), but the present invention is not limited to this.
- the TCON 60 may be configured by a computer system including a microprocessor (MPU), a ROM, a RAM, and the like, for example.
- MPU microprocessor
- ROM read-only memory
- RAM random access memory
- each operation described above can be realized by the microprocessor operating in accordance with a computer program for executing each operation described above.
- the TCON 60 determines the order of writing in one frame and controls each operation of the display pixel P1.
- FIG. 8 is a flowchart for explaining the operation of the TCON 60.
- FIG. 9 is a diagram illustrating an example of a frame.
- the TCON 60 reduces the difference in voltage signal between two rows in which the order of writing continues (hereinafter, abbreviated as “voltage difference” as appropriate). Rearrange the order.
- the output power P of the source driver IC 20 is defined by CV 2 F. That is, the output power P of the source driver IC 20 is determined according to the square of the difference between the voltage signals corresponding to V. The output power P of the source driver IC 20 can be reduced by rearranging the order of writing so that the voltage signal difference is reduced.
- the voltage difference calculation unit 61 calculates an index value for setting the order of writing in units of rows (S11).
- the index value indicates the voltage of each row.
- FIG. 9 illustrates index values for 11 lines for the sake of explanation.
- the index values are 23, 17, 1, 5, 19, 2, 15, 29, 7, 18, 2.
- the writing order 1 is the order of writing before rearrangement, and the order is assigned in order from the first line.
- the rearrangement unit 62 rearranges the index values in ascending order, and sets the writing order in the rearranged order (S12).
- writing order 2 indicates the order of writing after rearrangement.
- the third line, the sixth line, the eleventh line, the fourth line, the ninth line, the seventh line, the second line, the tenth line, the fifth line, the first line, and the eighth line It has become.
- FIG. 10A is a graph showing the index value of each pixel row before the rearrangement of the writing order.
- an index value (a value corresponding to a voltage amplitude difference) of each pixel row is expressed as a vertical index value as one index value.
- the horizontal axis is the axis indicating the order of writing.
- the number is 1 to 2160.
- the number of pixel rows is 11 pixel rows, and the first to eleventh rows are represented.
- FIG. 10B is a graph showing the index value of each pixel row after the rearrangement of the writing order.
- the vertical axis is an axis indicating the index value
- the horizontal axis is an axis indicating the order of writing.
- the numerical value attached to the horizontal axis is a value indicating which pixel row the bar graph corresponds to.
- the index value difference is smaller between two pixel rows in which the order of writing is continuous as compared to the graph of FIG. 10A.
- a small index value difference means that the output power of the source driver IC 20 is small.
- the output power of the source driver IC 20 is defined by CV 2 F and is proportional to the square of the output voltage difference V.
- FIG. 11 is a diagram showing the output voltage of the source driver IC 20 when the order of frame writing shown in FIG. 4 is rearranged by the method of the present embodiment.
- a pixel row having the maximum voltage Smax is sequentially selected, a voltage is applied to each pixel row, and then a pixel row having the minimum voltage Smin is sequentially selected.
- a voltage is applied to each pixel row. Therefore, the order of application to each pixel row is as shown in FIG.
- the display on the display panel is shown in FIG.
- the writing order is illustrated as a case where the index values are rearranged in ascending order (in order from the smallest), but the index values may be rearranged in descending order (in order from the largest).
- FIG. 10C is a graph showing the index value of each pixel row after the rearrangement of the order of writing.
- the vertical axis is an axis indicating the index value
- the horizontal axis is an axis indicating the order of writing.
- the numerical value attached to the horizontal axis is a value indicating which pixel row the bar graph corresponds to.
- the output voltage difference V can be reduced, and the output voltage of the source driver IC 20 can be reduced.
- the video signal voltage is stored in a frame memory built in the TCON or the like. Using the data stored in the frame memory, the voltage value of the pixel row is obtained.
- the voltage value of the video signal applied to each pixel is summed in each pixel row, and the selection order of the pixel row to be selected is obtained by the summed value.
- a pixel row is selected by a gate driver IC.
- a gate driver IC For example, in the table at the right end of FIG. 9, when 23, 17, 1, 5, 19,..., 18 and 2 are the sum of the voltages of the pixel rows, 3, 6, 11, 4, 7,. .., 1st and 8th pixel rows are sequentially selected, and a video signal voltage is applied from the source driver to the pixels of each pixel row.
- ⁇ To reduce the power of the source driver, it can be realized by changing the order of pixel rows to be written. Obtaining the voltage difference (video signal voltage difference) for each pixel connected to each source signal line is the most accurate means of realization. However, the calculation quantity is large. In order to select a pixel row to be written, a representative value of each pixel row (for example, an odd pixel column, an even column pixel column, a pixel column that is a multiple of 16) is compared, and each index value (calculated value) difference of the pixel row is compared. The number of operations can be reduced by obtaining the order of pixel rows to the minimum.
- the display pixel P1 can perform the writing process of the video signal voltage Vsig (voltage signal) and the light emission process of the organic EL element independently by adopting the above-described configuration. Specifically, in the display pixel P1 of the present embodiment, a writing process, a reset process, a copy process (copy process), and a light emission process are executed.
- FIGS. 12A to 12D are diagrams illustrating four processes of the display pixel P1. Each process is executed by the TCON 60 controlling each circuit constituting the organic EL display 100.
- FIG. 12B and 12C are performed simultaneously on all the pixels of the display screen in the blanking period of one frame.
- FIG. 12A video signal voltages are sequentially applied to the capacitor Cc pixel by pixel from the top to the bottom of the screen at times other than the blanking period of one frame.
- FIG. 12D is performed at a time other than the blanking period of one frame.
- the voltage signal is written to the capacitor Cc while causing the organic EL element OEL1 to emit light according to the current voltage signal of the capacitor Cs.
- FIG. 12A is a diagram showing the states of the switching elements T1 to T4 in the writing process. As shown in FIG. 12A, in the writing process, the switching elements T1 and T4 are in the ON state, and the switching elements T2 and T3 are in the OFF state. By setting the state of each transistor in this way, the next voltage signal can be written to the capacitor Cc while causing the organic EL element OEL1 to emit light according to the current voltage signal.
- the capacitor Cs is reset in a state where the light emission of the organic EL element OEL1 is stopped.
- FIG. 12B is a diagram showing the states of the switching elements T1 to T4 in the reset process.
- the switching element T3 in the reset process, the switching element T3 is in the ON state and the switching elements T1, T2, and T4 are in the OFF state. Since the switching elements T1 and T2 are in the OFF state, the capacitor Cc holds a charge corresponding to the next voltage signal. Further, since the switching element T3 is in the ON state, the voltage Vref1 is input to the gate terminal of the driving transistor T5 and one end of the capacitor Cs. As a result, the drive transistor T5 is initialized. Since the switching element T4 is in the OFF state during the reset process, the organic EL element OEL1 does not emit light.
- the drive transistor T5 By setting the voltage Vref1 to a voltage that turns off the drive transistor T5 (Vt voltage or less), the drive transistor T5 can be maintained in a cut-off state even when the voltage Vref1 is applied to the gate terminal of the drive transistor T5. . Therefore, even when the switching element T4 is in the ON state, no current is supplied from the drive transistor T5 to the organic EL element OEL1. In this case, the switching element T4 may not be turned off.
- the next voltage signal written in the capacitor Cc is copied to the capacitor Cs in a state where the light emission of the organic EL element OEL1 is stopped.
- FIG. 12C is a diagram showing the states of the switching elements T1 to T4 in the copy process.
- the switching element T2 in the copy process, the switching element T2 is in the ON state and the switching elements T1, T3, and T4 are in the OFF state.
- the switching element T3 is turned off and the switching element T2 is turned on, one end of the capacitor Cc and one end of the capacitor Cs are connected, and the next voltage signal written in the capacitor Cc is copied to the capacitor Cs ( Write).
- the organic EL element OEL1 does not emit light because the switching element T4 is in the OFF state.
- FIG. 12D is a diagram showing the states of the switching elements T1 to T4 in the light emission process. As shown in FIG. 12D, in the light emission process, the switching element T4 is in the ON state and the switching elements T1 to T3 are in the OFF state. Thus, by setting the state of each transistor, the organic EL element OEL1 can emit light according to the next voltage signal.
- the video signal voltage can be written to the pixel even when a current is supplied to the organic EL element OEL1.
- a voltage corresponding to the video signal written to the pixel in the previous frame period is held by the capacitor Cs, and the driving transistor T5 supplies a current to the organic EL element OEL1 based on the voltage held by the capacitor Cs. .
- pixel rows are sequentially selected by a gate driver IC (circuit), and the source driver IC applies a video signal to the selected pixel.
- a voltage corresponding to the video signal is held in the capacitor Cc.
- the voltage held in the capacitor Cc is copied to the capacitor Cs. During this period, the display screen is maintained in a non-display state.
- the driving transistor T5 supplies current to the organic EL element OEL1 based on the voltage held in the capacitor Cs.
- the pixel according to the embodiment of the present disclosure includes the capacitors Cs and Cc that hold the voltage based on the video signal.
- the capacitors Cs and Cc for holding the voltage based on the video signal are provided.
- the present invention is not limited to this.
- two memory circuits may be constituted by transistors or the like, and the memory circuit may hold a voltage based on the video signal. Further, the voltage based on the video signal may be held in the gate capacitance of the MOS transistor.
- the switching of the frame display can be simultaneously performed for all the pixels by simultaneously switching the switching element T4 from the OFF state to the ON state for all the display pixels P1. That is, two frames can be prevented from being displayed together.
- FIG. 13 is a diagram illustrating an example of a frame.
- the relatively dark area A2 is written first, and then the intermediate brightness. Finally, a relatively bright area A1 is written in the area A3.
- the video is rewritten in the order of areas A2, A3, and A1.
- the pixel row is selected so that the voltage difference between the pixel row or the pixels of each pixel becomes small. Accordingly, pixel rows are not sequentially selected in the up, down, or down direction of the screen in each of the areas A1, A2, and A3 (however, in the areas A1, A2, and A3 for ease of implementation,
- the case where the screen is sequentially selected in the vertical direction or the downward and upward direction of the screen is also within the scope of the present disclosure. For example, it is needless to say that some pixel rows in the region A1 are written, then some pixel rows in the region A3 are written, and some remaining pixel rows in the region A1 are written.
- FIG. 14A and FIG. 14B are diagrams showing an example of a display screen at the time of frame switching in the comparative example. 14A and 14B show the state of an image actually displayed on the screen. This comparative example illustrates the case where voltage signal writing and video display cannot be performed independently, and each pixel row is selected downward from the top (in order from pixel row 1) downward.
- FIG. 14A and 14B in the comparative example, two frames are mixedly displayed on one screen.
- FIG. 14A when switching from frame 1 to frame 2, the video of the next frame 2 is displayed in the upper part of the screen and the video of the current frame 1 is displayed in the lower part of the screen.
- FIG. 14B when switching from frame 2 to frame 3, for example, the video of the next frame 3 is displayed in the upper part of the screen and the video of the current frame 2 is displayed in the lower part of the screen.
- the voltage signals are written in the order of the areas A2, A3, and A1 in FIG. Then, when the voltage signal writing and the video display cannot be performed independently, two frames are displayed in a more mixed manner than the video shown in FIGS. 14A and 14B, and the video quality is improved. May be reduced.
- the display image is uncomfortable in the following cases.
- the image in the A1 area is rewritten, the image in the A3 area is then rewritten, and then the image in the A2 area is rewritten.
- the display image in the specific area of the display screen is rewritten, so that the area where the display image is rewritten looks like a noise display. This is particularly noticeable when the display image is a moving image display.
- the display pixel P1 capable of independently writing the voltage signal and displaying the video is used. For this reason, video switching is performed simultaneously in the light emission processing for all the pixel rows.
- the image on which the voltage signal is written is not displayed as a display image, and the display image is displayed on the display screen based on the voltage of the capacitor Cs for which the voltage writing has been completed. Accordingly, as shown in FIG. 13, even when the voltage signals are written in the order of the areas A2, A3, and A1, the image at the time of writing is not displayed, so that the conventional display image does not feel strange.
- FIG. 15A and FIG. 15B are diagrams showing an example of a display screen at the time of frame switching when the display pixel P1 of the present embodiment is used.
- FIG. 15A and FIG. 15B show the state of an image actually displayed on the screen.
- video switching is performed at the same timing in all pixel rows.
- Video switching is preferably performed during a blanking period of one frame period.
- one frame is composed of a plurality of subfields, it is preferable to switch the video signal in the blanking period of all the subfields or in an arbitrary subfield period.
- two frames are not mixedly displayed on one screen.
- the order of writing is rearranged. Therefore, when voltage signal writing and video display cannot be performed independently, two frames are further fragmented on one screen. May be mixed and displayed.
- the writing of the voltage signal and the display of the video can be performed independently, so that two frames are not mixedly displayed on one screen. Therefore, it is possible to prevent a decrease in video quality due to rearrangement of the writing order.
- the order of writing is rearranged, and voltage signal writing and video display can be performed independently.
- the organic EL display 100 reduces the driving capability required for the source driver IC without degrading the video quality, suppresses the heat generation amount of the source driver IC, and eliminates the need for providing a special heat dissipation mechanism. It becomes possible.
- Modification 1 When frame is composed of a plurality of subfields 1] Modification 1 will be described with reference to FIGS.
- FIG. 16 is a diagram illustrating an example of a frame including a plurality of subfields.
- the luminance value increases as the subscript (number) value decreases, and the luminance value decreases as the subscript value increases.
- a desired luminance can be obtained by selecting a subfield to be lit according to the luminance value.
- each subfield is divided by luminance (brightness).
- the upper bits to the lower bits of the video data may be divided into subfields.
- the video signal is 8 bits
- one frame is composed of 8 subfields.
- the source driver IC outputs the voltage value weighted to the bit to the source signal line in each subfield.
- the index value of each pixel row can be obtained by obtaining the number of bits “1”.
- the index value with other pixel rows can be obtained by comparing the position of the bit “1”.
- 17 and 18 are diagrams illustrating an example of output power of the source driver IC 20 in the present modification.
- 17 and 18 first, the order of writing is rearranged within the subfield. 17 and 18 show a case where one frame is composed of four subfields for the sake of explanation.
- the display order of the fields is not rearranged, and the order of writing is rearranged within the subfields.
- the index values are large in the order of subfields 1 to 4 (index value of subfield 1> index value of subfield 2> index value of subfield 3> index value of subfield 4). For this reason, when the index values are rearranged in descending order for each field, the index values are rearranged in descending order for the entire frame. Thereby, the difference in the output voltage of the source driver IC 20 can be reduced over the entire frame.
- the display order of subfields is set in the order of subfields 4 to 1. Further, in FIG. 18, the index values are rearranged in ascending order for each subfield. That is, in FIG. 18, the index values are rearranged in ascending order in the entire frame. Thereby, the difference in the output voltage of the source driver IC 20 can be reduced.
- the video signal voltage is stored in a frame memory built in the TCON 60 or the like.
- the frame memory is further divided into a plurality of subfields.
- frame memory data is calculated and image data is divided into a plurality of subfields.
- the voltage value of the pixel row in each subfield is obtained.
- the voltage value of the video signal applied to each pixel is summed in each pixel row of each subfield, and the selection order of the pixel row to be selected is obtained by the summed value.
- the voltage difference (video signal voltage difference) for each pixel connected to each source signal line.
- the voltage difference between the pixels is summed in the pixel rows, the magnitude relation of the obtained sum is obtained, and the order of the pixel rows to be selected is obtained. Note that there are n-1 combinations of pixel voltage differences between the first pixel row and the second pixel row if there are n pixel rows.
- the combination calculation can be obtained by performing calculation processing using data stored in the memory.
- the power of the source driver IC 20 can be reduced by changing the order of pixel rows to be written. Obtaining the voltage difference (video signal voltage difference) for each pixel connected to each source signal line is the most accurate means of realization. However, the calculation quantity is large. In order to select a pixel row to be written, a representative value of each pixel row (for example, an odd pixel column, a prime pixel column, a pixel column that is a multiple of 64) is compared, and each index value (calculated value) difference of the pixel row is The calculation quantity can be reduced by obtaining the pixel row order to the minimum.
- each pixel row for example, an odd pixel column, a prime pixel column, a pixel column that is a multiple of 64, etc.
- each pixel row for example, an odd pixel column, a prime pixel column, a pixel column that is a multiple of 64, etc.
- Modification 2 When frame is composed of a plurality of subfields 2] Modification 2 will be described with reference to FIGS. 19 and 20.
- the index values are rearranged in ascending or descending order. However, in this modification, whether the index values are rearranged in ascending order or descending order is selected for each subfield or frame (for each image). Yes.
- the subfield is defined by other than the brightness value, such as upper bit to lower bit. For this reason, when rearrangement is performed in the same manner as in the first modification, the difference between the index values can be reduced within the subfield, but the difference between the index values cannot be reduced between the fields.
- the TCON 60 obtains the minimum value and the maximum value of the index values in the current rearrangement process.
- the TCON 60 compares the final index value, which is the index value of the last row in the order of writing in the previous subfield (or frame), with the minimum value and the maximum value of the index value in the current subfield (or frame). .
- TCON 60 sorts the index values in ascending order when the difference between the final index value and the minimum value is smaller than the difference between the final index value and the maximum value, and the difference between the final index value and the maximum value is the final index value. If the difference is smaller than the minimum value, the index values are rearranged in descending order.
- 19 and 20 are diagrams illustrating an example of output power of the source driver IC 20 in the present modification.
- 19 and 20 first, the order of writing is rearranged within the subfield.
- 19 and 20 show a case where one frame is composed of four subfields for the sake of explanation.
- the index values are rearranged in descending order.
- the final index value of subfield 1 is the minimum value of the index value of subfield 1.
- the difference between the final index value of subfield 1 and the maximum index value of subfield 2 is smaller than the difference between the final index value of subfield 1 and the minimum index value of subfield 2. Therefore, in the subfield 2, the index values are rearranged in descending order.
- the difference between the minimum value of the index value of subfield 2 and the minimum value of the index value of subfield 3 is the difference between the minimum value of the index value of subfield 2 and the maximum value of the index value of subfield 3. Is also small. Therefore, in the subfield 3, the index values are rearranged in ascending order.
- the difference between the maximum index value of subfield 3 and the maximum index value of subfield 4 is greater than the difference between the maximum index value of subfield 3 and the minimum index value of subfield 4. Is also small. Therefore, in the subfield 4, the index values are rearranged in descending order.
- the difference in the output voltage of the source driver IC 20 can be reduced not only within the field but also between the fields.
- the index values are sorted in descending order for the first subfield 1, whereas in FIG. 20, the index values are sorted in ascending order for the first subfield 1.
- the index values are sorted in ascending order for the odd-numbered subfields 1 and 3, and the index values are sorted in descending order for the even-numbered subfields 2 and 4. Yes.
- the index values are rearranged in descending order or in ascending order for each subfield.
- the index values may be selected for each frame.
- this modification example selects whether the index values are rearranged in descending order or in ascending order for each subfield or each frame, it is particularly useful when the configuration of the subfields is not in the order of luminance values. .
- FIG. 21 is a diagram showing an example of a method of rearranging the writing order in this modification.
- the TCON 60 executes a first search process and a second search process described below.
- the TCON 60 sets a search target line to a line in which the order of writing is not set. Further, as a search condition, (search condition 1) has an index value whose difference from the last searched index value is equal to or less than a threshold, and (search condition 2) is smaller than the last searched index value. Is set.
- the TCON 60 sequentially searches the search target rows in one direction, that is, in the order of the pixel rows 1 to 11, and sets the writing order in the searched order.
- the TCON 60 sets a line for which the order of writing is not set as a search target line, and sets (search condition 3) an index value larger than the index value searched last as a search condition. is doing.
- the TCON 60 sequentially searches the search target rows in one direction, that is, in the order of the pixel rows 1 to 11, and sets the writing order in the searched order.
- the threshold value is set to 10.
- all the pixel rows 1 to 11 are set as search target rows.
- pixel row 1 is searched.
- the index value 17 of the pixel row 2 whose difference from the index value 23 of the pixel row 1 is smaller than 10 is searched.
- the index value 15 of the pixel row 7 whose difference from the index value 17 of the pixel row 2 is smaller than 10 is searched.
- Pixel rows 3, 4, and 6 are not searched because the difference is greater than 10.
- the index value 19 of the pixel row 5 is larger than the index value 17 of the pixel row 2, and thus is not a search target.
- the index value 7 of the pixel row 9 and the index value 2 of the pixel row 11 are searched.
- the searched pixel rows 1, 2, 7, 9, and 11 are set in the order of writing in this order.
- the second search process is executed.
- pixel rows 3 to 6, 8, and 10 in which the writing order is not set are set as search target rows.
- the pixel row 3 is searched, and then the pixel row 4 having the index value 5 larger than the index value 1 of the pixel row 3 is searched.
- the index value 19 for pixel row 5 and the index value 29 for pixel row 8 are searched.
- the retrieved pixel rows 3, 4, 5, and 8 are set in the order of writing in this order.
- the order of writing is set in the order of pixel rows 1, 2, 7, 9, 11, 3, 4, 5, 8, 6, 10.
- the difference in the output voltage of the source driver IC 20 can be reduced.
- the guideline for changing the order of writing pixel rows is to set and compare representative values of pixels in each pixel row (pixels from the maximum value to the 64th pixel, pixels from the minimum value to the 64th pixel, pixels located in the 64 pixel column, etc.) However, this may be realized by minimizing the difference between the index values of all rows.
- the light emission efficiency differs depending on the emission color such as red (R), green (G), blue (B), and the required voltage amplitude also differs. Therefore, it is preferable to obtain the index value by dividing it into red (R), green (G), and blue (B).
- FIG. 22 is a diagram showing an example of a method of rearranging the writing order in the present modification.
- the TCON 60 executes the first search process of the modified example 3.
- the second search condition is not executed.
- the first search process of this modification has a configuration in which the search condition 2 is omitted from the first search process of the modification 3.
- search condition 1 is set to have an index value whose difference from the index value searched last is equal to or less than a threshold value.
- the first search process is repeatedly executed until there are no search target rows.
- the TCON 60 searches the search target rows in one direction, that is, sequentially in the order of the pixel rows 1 to 11, and sets the writing order in the searched order.
- the threshold value is set to 7.
- pixel rows 1 to 11 are set as search target rows.
- pixel row 1 is searched.
- the index value 17 of the pixel row 2 whose difference from the index value 23 of the pixel row 1 is smaller than 7 is searched.
- the index value 19 of the pixel row 5 whose difference from the index value 17 of the pixel row 2 is smaller than 7 is searched.
- Pixel rows 3 and 4 are out of search because the difference is greater than 7.
- the index value 15 of the pixel row 7 and the index value 18 of the pixel row 10 are searched.
- the searched pixel rows 1, 2, 5, 7, and 10 are set in the order of writing in this order.
- pixel rows 3, 4, 6, 8, 9, and 11 are set as search target rows.
- pixel row 3 is searched.
- the index value 5 of the pixel row 4 whose difference from the index value 1 of the pixel row 3 is smaller than 7 is searched.
- the index value 2 of the pixel row 6, the index value 7 of the pixel row 9, and the index value 2 of the pixel row 11 are searched.
- the searched pixel rows 3, 4, 6, 9, and 11 are set in the order of writing in this order.
- the pixel row 8 is the search target row.
- the next writing order is assigned to the pixel row 8.
- the order of writing is set in the order of pixel rows 1, 2, 5, 7, 10, 3, 4, 6, 9, 11, 8.
- the difference in the output voltage of the source driver IC 20 can be reduced.
- This modification is different from the above embodiment and Modifications 1 to 4 in the method of calculating an index value indicating the brightness of each row.
- the number of pixels, Luma (k) was obtained as a voltage value indicated by the voltage signal corresponding to the display pixels P1 in the k columns.
- the index value of the present modification is the difference in brightness between the two rows, that is, The relative row brightness is shown in contrast to other rows.
- FIG. 23 is a diagram showing an example of a method of rearranging the writing order in the present modification.
- the search method may be set according to the embodiment and the first to fourth modifications.
- the TCON 60 selects, for example, the pixel row 1 first, and then the pixel row whose index value between the pixel row 1 is equal to or less than the threshold value (corresponding to the modified examples 3 and 4) or the pixel row 1 A pixel row having the smallest index value between (corresponding to the embodiment, modified examples 1, 2 and the like) and the like are searched. Similarly, the pixel rows having the index value between the last searched pixel row and the threshold value or less are sequentially searched.
- the difference in the output voltage of the source driver IC 20 can be reduced.
- Modification 6 Another Example of Display Pixel Configuration
- Modification 6 will be described with reference to FIG. In this modification, the configuration of the display pixel P is different from the above embodiment and Modifications 1 to 4.
- FIG. 24 is a circuit diagram showing an example of the configuration of the display pixel P2 (P) in the present modification.
- the display pixel P2 includes switching elements T11 to T14, T16, T17, capacitors Cc and Cs, a driving transistor T15, and an organic EL element (light emitting element) OEL1.
- the switching element T11 is an example of a first switch circuit that switches between selection and non-selection of the display pixel P2, and includes an N-channel MOS transistor.
- the switching element T11 switches between conduction and non-conduction between the source signal line SL and the node N11 in accordance with a selection signal applied to the gate signal line GL11.
- Switching elements T12 to T14, T16, and T17 are N-channel MOS transistors. A switching operation to write a voltage signal to the capacitor Cc by the switching elements T12 to T14, T16, T17, a reset operation to reset the capacitor Cs, a copy operation to copy the voltage signal written to the capacitor Cc to the capacitor Cs, and The light emitting operation of emitting light from the organic EL element OEL1 can be performed.
- the switching element T12 is an example of a second switch circuit that switches connection and disconnection between the capacitor Cc and the capacitor Cs, and the continuity between the node N11 and the node N12 according to a signal applied to the gate signal line GL12. And non-conducting.
- the switching element T13 switches whether or not to input the voltage Vref2 to the node N12 according to a signal applied to the gate signal line GL13.
- the voltage Vref2 is a voltage for initializing the capacitor Cc.
- the switching element T14 is an example of a third switch circuit that switches connection and disconnection between the drive transistor T15 and the organic EL element OEL1, and the organic EL element formed by the drive transistor T15 according to a signal applied to the gate signal line GL14. Switching between supply and non-supply of drive current to OEL1.
- the switching element T16 switches whether or not to input the voltage Vref1 to the node N12 according to a signal applied to the gate signal line GL15.
- the voltage Vref1 is a voltage for initializing the capacitor Cs.
- the switching element T17 switches whether to apply the voltage VINI to the node N13 according to a signal applied to the gate signal line INI.
- the voltage VINI is a voltage for initializing the organic EL element OEL1.
- the drive transistor T15 is an N-channel MOS transistor, and supplies a drive current corresponding to the magnitude of the voltage signal written in the capacitor Cs to the organic EL element OEL1.
- the drive transistor T15 has a gate terminal connected to the node N12, a drain terminal connected to the anode electrode of the organic EL element OEL1, and a voltage VTFT input to the source terminal via the switching element T14.
- the organic EL element OEL1 is an element that emits light according to the drive current supplied from the drive transistor T15.
- the voltage VEL is input to the cathode electrode, and the anode electrode is connected to the switching element T14.
- the capacitor Cc is a capacitor to which a voltage signal is written by the source driver IC 20, and one end is connected to the node N11 and the other end is input with the voltage Vref1.
- the capacitor Cs is a capacitor to which the voltage signal of the capacitor Cc is copied (accepts the charge of the capacitor Cc), one end is connected to the node N12, and the voltage VTFT is input to the other end.
- the display pixel P2 can perform voltage signal writing and light emission of the organic EL element independently by adopting the above-described configuration.
- the difference in the output voltage of the source driver IC 20 can be reduced by rearranging the order of writing by the method described in the embodiment and the modifications 1 to 5.
- the display pixel P2 of the present modification it is possible to prevent the video quality from being deteriorated.
- the organic EL display (display device) has been described based on the embodiment.
- the present disclosure is not limited to this embodiment. Unless it deviates from the gist of the present disclosure, various modifications conceived by those skilled in the art have been made in this embodiment, and forms constructed by combining components in different embodiments are also within the scope of one or more aspects. It may be included.
- the sum of squares of luminance values is obtained as an index value indicating the brightness of each row of a plurality of display pixels.
- the index value may be, for example, an average value of pixels in one row, an average value of squares, or the like.
- the index values are rearranged in descending or ascending order.
- a pattern that defines whether the index values are sorted in ascending order or descending order may be set in advance for each field or frame.
- the index values are rearranged in descending order or in ascending order for each field or frame. Alternatively, it may be set alternately.
- the present disclosure can be used for a display device such as an organic EL display using an organic electroluminescence (EL) element.
- a display device such as an organic EL display using an organic electroluminescence (EL) element.
- EL organic electroluminescence
- Organic EL Panel 11 Display Area 12 Glass Substrate 20
- Source Driver IC 21
- Gate driver IC 41
- Gate signal line drive circuit 60
- TCON 61
- Voltage difference calculation unit 62
- Rearrangement unit 63
- Gate side control unit 64
- Organic EL display 221 Shift register A1, A2, A3 Region Cc, Cs Capacitors INI, GL, GL1, GL2, GL3, GL4, GL11, GL12, GL13, GL14, GL15
- Gate signal lines N1, N2, N11, N12, N13 Node OEL1
- Organic EL element Smax Maximum voltage Smin Minimum voltage SL
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Abstract
Description
上述したように、有機ELディスプレイでは、40インチ以上など、大画面サイズの表示パネルほど、ソース信号線の負荷容量が大きくなり、発熱量が大きくなる傾向にある。また、有機ELディスプレイでは、4K2Kパネル(画素数が4K×2K以上のパネル)あるいは8K4Kパネル等、高精細の表示パネルほど、1画素行の選択期間が短くなり、ソースドライバICから出力する映像信号の変化速度(周波数)が速くなるため、ソースドライバICの発熱量が大きくなる。ソースドライバICの出力電力は、ソース信号線の容量C、映像振幅電圧の電圧差Vの2乗、および、1画素行の選択時間を換算した周波数Fに比例する。
先ず、比較例における有機ELディスプレイの構成について、図1A~図3を用いて説明する。図1Aは、有機ELディスプレイの外観の一例を示す外観図である。図1Bは、有機ELディスプレイの構成の一例を示すブロック図である。
図2は、有機ELパネル10の負荷容量の一例を示す図である。図3は、比較例における充放電時の電力の一例を示す表である。
実施の形態の表示装置について、図5~図15Bを基に説明する。
本実施の形態における有機ELディスプレイの構成について、図1B、図5~図6を基に説明する。
表示画素Pは、R(赤)G(緑)B(青)の3原色のいずれか1つに対応している。RGBの3つの表示画素Pのセットで、1つの画素が構成されている。同じ画素を構成する複数の表示画素Pは、それぞれ隣接して配置されている。
ソースドライバIC20は、ここでは、フレキシブルケーブルにソース信号線駆動回路21を搭載したCOFで構成されている。ソース信号線駆動回路21は、TCON60からのデータ信号に基づき、ソース信号線SLのそれぞれに、ソース信号線SLに接続された表示画素P1の画素値に対応する電圧値の電圧信号を印加する。PCB30は、ソースドライバIC20とTCON60とを接続するプリント基板である。
ゲートドライバIC40は、ここでは、フレキシブルケーブルにゲート信号線駆動回路41を搭載したCOFで構成されている。ゲート信号線駆動回路41は、TCON60により選択されたゲート信号線GLに対し、当該ゲート信号線GLに接続された表示画素P1のスイッチング素子(トランジスタ)をON状態にする電圧値の選択信号を印加する。また、ゲート信号線駆動回路41は、TCON60により選択されなかった(非選択の)ゲート信号線GLのそれぞれに対し、当該ゲート信号線GLに接続された表示画素P1のスイッチング素子をOFF状態にする電圧値の非選択信号を印加する。
TCON60は、表示領域11における映像の表示を制御する制御部の一例である。
有機ELディスプレイ100の動作について、図8~図15Bを用いて説明する。
TCON60の書き込みの順序の決定について、図8~図11を基に説明する。
表示画素P1の動作について、図12A~図15Bを基に説明する。
図13は、フレームの一例を示す図である。
変形例1について、図16~図18を基に説明する。
変形例2について、図19および図20を基に説明する。
変形例3について、図21を基に説明する。
変形例4について、図22を基に説明する。
変形例5について、図23を基に説明する。
変形例6について、図24を基に説明する。本変形例では、上記実施の形態および変形例1~4とは、表示画素Pの構成が異なる。
以上、有機ELディスプレイ(表示装置)について、実施の形態に基づいて説明したが、本開示は、この実施の形態に限定されるものではない。本開示の趣旨を逸脱しない限り、当業者が思いつく各種変形を本実施の形態に施したものや、異なる実施の形態における構成要素を組み合わせて構築される形態も、一つまたは複数の態様の範囲内に含まれても良い。
11 表示領域
12 ガラス基板
20 ソースドライバIC
21 ソース信号線駆動回路
30、50 PCB
40 ゲートドライバIC
41 ゲート信号線駆動回路
60 TCON
61 電圧差算出部
62 並び替え部
63 ゲート側制御部
64 ソース側制御部
100 有機ELディスプレイ
221 シフトレジスタ
A1、A2、A3 領域
Cc、Cs コンデンサ
INI、GL、GL1、GL2、GL3、GL4、GL11、GL12,GL13、GL14、GL15 ゲート信号線
N1、N2、N11、N12、N13 ノード
OEL1 有機EL素子
Smax 最大電圧
Smin 最小電圧
SL ソース信号線
T1、T2、T3、T4、T11、T12、T13、T14、T16、T17 スイッチング素子
T5、T15 駆動トランジスタ
VTFT、VINI、VEL、Vref1、Vref2、Voffj、Vonj 電圧
Vsig 映像信号電圧
Claims (10)
- 行毎に配置された複数のゲート信号線と、列毎に配置された複数のソース信号線と、前記複数のゲート信号線と前記複数のソース信号線との交差点のそれぞれに配置された複数の表示画素とを有する表示部と、
前記複数のゲート信号線を指定された順序で選択可能なゲートドライバと、
前記複数のソース信号線のそれぞれに電圧信号を出力するソースドライバと、
前記複数の表示画素、前記ゲートドライバおよび前記ソースドライバの制御を行う制御部とを備え、
前記複数の表示画素のそれぞれは、駆動電流に応じて発光する発光素子と、前記電圧信号が書き込まれる書き込み用コンデンサと、前記書き込み用コンデンサの電荷を受け付け可能な表示用コンデンサと、前記表示用コンデンサに保持された電荷の大きさに応じた前記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し、前記書き込み用コンデンサに対する電圧信号の書き込みと、前記表示用コンデンサに保持された電荷に応じた前記発光素子の発光とを独立して実行できるように構成され、
前記制御部は、前記表示部における行単位での書き込みの順序を、前記書き込みの順序が連続する2つの行の間の電圧信号の差が小さくなるように並び替える並び替え処理を実行し、
前記制御部は、前記ゲートドライバに対し、前記制御部による並び替え処理後の前記書き込みの順序で前記複数のゲート信号線の選択を行わせるように、前記書き込みの順序を指定する、
表示装置。 - 前記制御部は、前記並び替え処理において、
前記複数の表示画素の各行の明るさを示す指標値を算出し、前記指標値を用いて前記書き込みの順序の並び替えを行う、
請求項1に記載の表示装置。 - 前記制御部は、
前記指標値として、前記複数の表示画素それぞれについて前記電圧信号の2乗を求め、当該電圧信号の2乗を行毎に合計した合計値を求める、
請求項2に記載の表示装置。 - 前記制御部は、前記並び替え処理において、
前記指標値を降順にまたは昇順に並べ替え、並び替えた順序に前記書き込みの順序を設定する、
請求項2または3に記載の表示装置。 - 前記制御部は、前記並び替え処理において、
現在の前記並び替え処理における前記指標値の最小値と最大値とを求め、
前回の前記並び替え処理における前記書き込みの順序が最後の行の指標値である最終指標値と、前記最小値および前記最大値とを比較し、
前記最終指標値と前記最小値との差が前記最終指標値と前記最大値との差よりも小さい場合は、前記指標値を昇順に並び替え、
前記最終指標値と前記最大値との差が前記最終指標値と前記最小値との差よりも小さい場合は、前記指標値を降順に並び替える、
請求項4に記載の表示装置。 - 前記制御部は、前記並び替え処理において、
前記書き込みの順序が設定されていない行を検索対象行とし、最後に検索された前記指標値との差が閾値以下となる前記指標値を有することを検索条件として、前記検索対象行を一方向に順次検索し、検索された順に前記書き込みの順序を設定する第一検索処理を実行する、
請求項2または3に記載の表示装置。 - 前記制御部は、
前記第一検索処理の実行後に、さらに、
前記書き込みの順序が設定されていない行を検索対象行とし、最後に検索された前記指標値よりも大きいまたは小さい前記指標値を有する検索対象行を前記一方向に検索し、検索された順に前記書き込みの順序を設定する第二検索処理とを実行する、
請求項6に記載の表示装置。 - 前記複数の表示画素のそれぞれは、さらに、
前記複数の表示画素それぞれの選択および非選択を切り替える第一スイッチ回路と、
前記書き込み用コンデンサと前記表示用コンデンサとの接続および非接続を切り替える第二スイッチ回路と、
前記駆動トランジスタと前記発光素子との接続および非接続を切り替える第三スイッチ回路とを備える、
請求項1~6の何れか1項に記載の表示装置。 - 前記ゲートドライバは、
前記電圧信号を書き込む書き込み処理時に、前記第二スイッチ回路を非接続にして前記書き込み用コンデンサと前記表示用コンデンサとを独立させ、前記第一スイッチ回路を選択に設定して前記書き込み用コンデンサに前記電圧信号を書き込み、前記第三スイッチ回路を接続に設定して前記発光素子を発光させ、
前記電圧信号を前記書き込み用コンデンサから前記表示用コンデンサに複写する複写処理時に、前記第一スイッチ回路を非選択に設定し、前記第三スイッチ回路を非接続に設定して前記発光素子の発光を停止させ、前記第二スイッチ回路を接続に設定して前記書き込み用コンデンサに書き込まれた前記電圧信号を前記表示用コンデンサに書き込む、
請求項8に記載の表示装置。 - 行毎に配置された複数のゲート信号線と、列毎に配置された複数のソース信号線と、前記複数のゲート信号線と前記複数のソース信号線との交差点のそれぞれに配置された複数の表示画素とを有する表示部と、
前記複数のゲート信号線を指定された順序で選択可能なゲートドライバと、
前記複数のソース信号線のそれぞれに電圧信号を出力するソースドライバと、
前記複数の表示画素、前記ゲートドライバおよび前記ソースドライバの制御を行う制御部とを備え、
前記複数の表示画素のそれぞれが、駆動電流に応じて発光する発光素子と、前記電圧信号が書き込まれる書き込み用コンデンサと、前記書き込み用コンデンサの電荷を受け付け可能な表示用コンデンサと、前記表示用コンデンサに保持された電荷の大きさに応じた前記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し、前記書き込み用コンデンサに対する電圧信号の書き込みと、前記表示用コンデンサに保持された電荷に応じた前記発光素子の発光とを独立して実行できるように構成された表示装置に実行させる表示方法であって、
前記制御部は、
前記表示部における行単位での書き込みの順序を、前記書き込みの順序が連続する2つの行の間の電圧信号の差が小さくなるように並び替えるステップと、
前記ゲートドライバに対し、並び替えた後の前記書き込みの順序で前記複数のゲート信号線の選択を行わせるように、前記書き込みの順序を指定するステップと、
前記ゲートドライバによるゲート信号線の選択時に、前記表示用コンデンサと前記書き込み用コンデンサとが電気的に接続されないように前記表示画素を制御するステップと、
前記ゲートドライバにより前記複数のゲート信号線が選択されていない時に、前記表示用コンデンサと前記書き込み用コンデンサとが電気的に接続されるように前記表示画素を制御するステップとを含む
表示方法。
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