WO2006090560A1 - 画像表示装置 - Google Patents
画像表示装置 Download PDFInfo
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- WO2006090560A1 WO2006090560A1 PCT/JP2006/301576 JP2006301576W WO2006090560A1 WO 2006090560 A1 WO2006090560 A1 WO 2006090560A1 JP 2006301576 W JP2006301576 W JP 2006301576W WO 2006090560 A1 WO2006090560 A1 WO 2006090560A1
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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
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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
- 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
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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]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
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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
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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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
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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
- G09G2300/0847—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 without any storage capacitor, i.e. with use of parasitic capacitances as storage elements
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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
- G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation 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
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
Definitions
- the present invention relates to an image display device such as an organic EL display.
- TFTs thin film transistors formed of amorphous silicon, polycrystalline silicon, or the like, or the above-described organic EL elements constitute each pixel, and an appropriate current value for each pixel. Is set, the luminance is controlled.
- FIG. 13 is a diagram showing a configuration of a pixel circuit corresponding to one pixel in a conventional image display device.
- the pixel circuit shown in the figure includes an organic EL element OLED that is a light emitting means, an organic EL element capacitance Coled, a driving transistor Td that is a driver means, a threshold voltage detection transistor Tth, an auxiliary capacitance Cs that is a first capacitance element, and switching. It is configured to include transistor T1 and switching transistor T2.
- the drive transistor Td is a control element for controlling the amount of current flowing in the organic EL element OLED according to the potential difference applied between the gate electrode (control electrode) and the source electrode (first electrode). is there.
- the threshold voltage detection transistor Tth has a function of electrically connecting the gate electrode (control electrode) and the drain electrode (second electrode) of the drive transistor Td when the transistor Tth is turned on. When the threshold voltage detection transistor Tth is turned on, a current flows from the gate electrode of the driving transistor Td to the drain electrode, and when the current substantially does not flow, the gate electrode of the driving transistor Td between the source electrode and the source electrode The potential difference is substantially the threshold voltage Vth.
- the organic EL element OLED is an element having a characteristic that current flows and emits light when a potential difference equal to or higher than the threshold voltage of the organic EL element OLED is applied between the anode electrode and the force sword electrode.
- Organic EL elements OLEDs are made of Al, Cu, ITO (Indium Tin Oxide), etc.
- An anode layer and a force sword layer formed, and a light emitting layer formed of an organic material such as phthalocyanine, trisaluminum complex, benzoquinolinolato, and beryllium complex between the anode layer and the force sword layer. It has the structure provided with at least.
- the organic EL element OLED has a function of generating light by recombination of holes and electrons injected into the light emitting layer.
- the organic EL element capacity Coled is an equivalent expression of the capacity of the organic EL element OLED.
- the drive transistor Td, the threshold voltage detection transistor Tth, the switching transistor Tl, and the switching transistor T2 are, for example, thin film transistors. Note that in each drawing referred to below, the channel (n-type or p-type) of each thin film transistor is not clearly shown, but it is either n-type or p-type. It shall follow the description in it.
- the power supply line 10 supplies power to the drive transistor Td and the switching transistor T2.
- the Tth control line 11 supplies a signal for controlling the threshold voltage detection transistor Tth.
- the merge line 12 supplies a signal for controlling the switching transistor T2.
- the scanning line 13 supplies a signal for controlling the switching transistor T1.
- the image signal line 14 supplies an image signal.
- the pixel circuit operates through four periods: a preparation period, a threshold voltage detection period, a writing period, and a light emission period. That is, during the preparation period, a predetermined positive potential (Vp, Vp> 0) is applied to the power supply line 10, the threshold voltage detection transistor Tth is off, the switching transistor T1 is off, the drive transistor Td is on, It is controlled so that transistor T2 is turned on. As a result, a current flows through the power source line 10 ⁇ the driving transistor Td ⁇ the organic EL element capacitance Coled, and the electric charge is accumulated in the organic EL element capacitance Coled.
- Vp, Vp> 0 a predetermined positive potential
- the threshold voltage detection transistor Tth is controlled to be turned on, and the gate electrode and the drain electrode of the drive transistor Td are connected. Is done.
- the charges accumulated in the auxiliary capacitor Cs and the organic EL element capacitor Coled are discharged, and a current flows through the drive transistor Td ⁇ the power supply line 10 and the negative path.
- the potential difference between the gate electrode and the drain electrode of the drive transistor Td When the threshold voltage Vth corresponding to the driving threshold of the transistor Td is reached, the driving transistor Td is turned off.
- the potential of the power supply line 10 is maintained at zero potential, the switching transistor T1 is turned on, the switching transistor T2 is turned off, and the charge accumulated in the organic EL element capacitor Cole d is discharged. .
- a predetermined negative potential (—VDD, VDD> 0) is marked on the power supply line 10
- the drive transistor Td is turned on
- the threshold voltage detection transistor Tth is turned off
- the switching transistor T1 Is controlled to be turned off.
- a current flows through the organic EL element OLED ⁇ drive transistor Td ⁇ power supply line 10 and the organic EL element OLED emits light.
- Non-Patent Document 1 S. Ono et al., Proceedings of IDW '03, 255 (2003) Disclosure of the Invention
- the current Ids flowing through the driving TFT is proportional to the square of the difference between the potential difference Vgs between the gate electrode and the source electrode (gate electrode potential Vg ⁇ source electrode potential Vs) and the threshold voltage Vth inherent to the TFT. It is known. Therefore, in order to obtain a clear image, it is necessary to increase this Vgs as much as possible.
- FIG. 14 is a diagram showing parasitic capacitance and the like generated in the pixel circuit shown in FIG.
- the parasitic capacitance CgdTd and the parasitic capacitance CgsTd exist near the gate electrode of the driving transistor Td, and the parasitic capacitance also exists near the gate electrode of the threshold voltage detection transistor Tth.
- CgdTth and parasitic capacitance CgsTth exist.
- the present invention has been made in view of the above, and an object thereof is to provide an image display device capable of improving writing efficiency.
- the present invention includes a light emitting means, a control terminal, a first terminal, and a second terminal, and a potential difference between the control terminal and the first terminal.
- the current flowing between the first terminal and the second terminal is controlled, so that the driver means for controlling the light emission of the light emitting means, and one electrode is directly connected to the control terminal of the driver means.
- a first capacitor element that is connected indirectly or indirectly, and the other electrode is connected directly or indirectly to a signal line that supplies a potential corresponding to the image data, and the image data passes through the signal line.
- a second capacitor element electrically connected in series to the first capacitor element during a writing period of writing to the first capacitor element.
- the first capacitor element and the light emitting means are electrically connected in series during the writing period.
- the second capacitor element and the light emitting means are electrically connected in parallel during the writing period.
- the driver means is disposed between the control terminal and the second capacitive element, and the control terminal and the second capacitive element are arranged.
- the switching element is provided between the control terminal of the driver means and the second capacitor element during a light emission period of the light emitting element.
- the electrical connection is cut off.
- the potential line is electrically connected to the first terminal or the second terminal of the driver means.
- the potential line is a control line for controlling driving of the switching element.
- the capacitance value of the second capacitive element is 10% or more of the capacitance value of the light emitting means.
- the image display device includes first to third pixels that display different colors, and the first to third pixels are displayed.
- Each pixel has at least the light emitting means, the driver means, the first capacitive element, and the second capacitive element, and the capacitance value of the second capacitive element in each of the first to third pixels and the
- the power of Csuml to Csum3 has a value of 80% or more of the maximum value of Csuml to Csum3.
- the light emitting means, the control terminal, the first terminal, and the second terminal are provided, and the first terminal and the second terminal according to a potential difference between the control terminal and the first terminal.
- the write potential corresponding to the light emission luminance of the light emitting means is supplied via the signal line.
- the potential supplied to the terminal on one side of the capacitive element is held substantially constant while the write potential is supplied to the signal line. It is characterized by that.
- indirectly connected means that another component (such as a transistor) is present between two components (for example, a first capacitor and a second capacitor). This means that the two components are connected by wiring with the intervening.
- directly connected means that two components are connected by wiring without other components intervening.
- the second capacitive element connected in series to the first capacitive element during the image data writing period is provided.
- the potential written to the first capacitor element is reflected well in the first capacitor element. As a result, it is possible to improve the writing efficiency of the image display device.
- FIG. 1 is a diagram showing a configuration of a pixel circuit corresponding to one pixel of the image display device according to the first embodiment of the present invention.
- FIG. 2 is a sequence diagram for explaining the operation of the first embodiment.
- FIG. 3 is a diagram for explaining the operation during the preparation period shown in FIG. 2.
- FIG. 4 is a diagram for explaining the operation during the threshold voltage detection period shown in FIG.
- FIG. 5 is a diagram for explaining the operation in the write period shown in FIG. 2.
- FIG. 6 is a diagram for explaining the operation during the light emission period shown in FIG.
- FIG. 7 is a diagram showing a configuration of a pixel circuit corresponding to one pixel of the image display device according to the second embodiment of the present invention.
- FIG. 8 is a diagram showing a configuration of a pixel circuit corresponding to one pixel of the image display device according to the third embodiment of the present invention.
- FIG. 9 is a sequence diagram for explaining the operation of the third embodiment.
- FIG. 10 is a diagram showing a configuration of a pixel circuit corresponding to one pixel of the image display device according to the fourth embodiment of the present invention.
- FIG. 11 is a diagram showing another configuration example different from the pixel circuit shown in FIG.
- FIG. 12 is a diagram showing another configuration example different from the pixel circuit shown in FIGS. 10 and 11.
- FIG. 13 is a diagram showing a configuration of a pixel circuit corresponding to one pixel of a conventional image display device.
- FIG. 14 is a diagram showing parasitic capacitance and the like generated in the pixel circuit shown in FIG. Explanation of symbols
- FIG. 1 is a diagram illustrating a configuration of a pixel circuit corresponding to one pixel of the image display device according to the first embodiment of the present invention.
- the pixel circuit shown in FIG. 1 is configured to include the additional capacitor Cs2 that is the second capacitor element.
- the additional capacitor Cs2 is a capacitor for preventing or improving the decrease in write efficiency due to the parasitic capacitance described above.
- one end of the additional capacitor Cs2 is a force sword electrode of the organic EL element OLED (also the drain electrode of the drive transistor Td).
- the other end is connected to the power supply line 10 (also the source electrode of the drive transistor Td).
- the power supply line 10 is at a high potential (Vp)
- the merge line 12 is at a high potential (Vg H)
- the Tth control line 11 is at a low potential (VgL)
- the scanning line 13 is at a low potential (VgL).
- the image signal line 14 is set to zero potential.
- the threshold voltage detection transistor Tth is turned off, the switching transistor T1 is turned off, the driving transistor Td is turned on, and the switching transistor T2 is turned on.
- the current II flows through the path of the power supply line 10 ⁇ the driving transistor Td ⁇ the organic EL element capacity Coled, and charges are accumulated in the organic EL element capacity Coled.
- the power line 10 is zero potential
- the merge line 12 is high potential (Vg H)
- the Tth control line 11 is high potential (VgH)
- the scanning line 13 is low potential (VgL)
- the image signal line 14 is set to zero potential.
- the electric charge accumulated in the auxiliary capacitor Cs and the organic EL element capacitor Coled is discharged, and a current 12 flows through a path of the driving transistor Td ⁇ the power supply line 10.
- the driving transistor Td is turned off, and the threshold voltage Vth of the driving transistor Td is detected.
- the gate electrode potential of the driving transistor Td can be changed to a desired potential by supplying the data potential (one Vdata) from the image signal line to the auxiliary capacitor Cs indirectly or directly.
- the power supply line 10 is zero potential
- the merge line 12 is low potential (VgL)
- the Tth control line 11 is high potential (VgH)
- the scanning line 13 is high potential (VgH)
- the image signal line 14 is data potential. (One Vdata).
- the auxiliary capacitor Cs and the organic EL element capacitor Coled are electrically connected in series, and the additional capacitor Cs2 and the organic EL element capacitor Coled are electrically connected in parallel.
- the switching transistor T1 is turned on and the switching transistor T2 is turned off, and the charge accumulated in the organic EL element capacitor Coled is discharged.
- current 13 flows through the path of organic EL element capacitance Coled ⁇ threshold voltage detection transistor Tth ⁇ auxiliary capacitance Cs, and electric charge is accumulated in auxiliary capacitance Cs. That is, the charge accumulated in the organic EL element capacitor Coled moves to the auxiliary capacitor Cs.
- Vgs of the drive transistor Td in the writing period can be expressed by the following equation. This assumption also extends to the following equations (2) to (7).
- Vgs Vth-(Cs / Call)-Vdata (1)
- Equation (1) Call is the total capacitance directly connected to the gate electrode of the drive transistor Td when the threshold voltage detection transistor Tth is conducting, and can be expressed as the following equation: .
- Equation (2) Coled is the equivalent capacitance of the organic EL element OLED, CgsTth is the parasitic capacitance between the gate electrode and the source electrode of the threshold voltage detection transistor Tth, and CgdTt h is a parasitic capacitance between the gate electrode and the drain electrode of the threshold voltage detection transistor Tth, and CgsTd is a parasitic capacitance between the gate electrode and the source electrode of the driving transistor Td.
- the threshold voltage detection transistor Tth becomes conductive, the gate electrode of the drive transistor Td and the drain electrode are connected, and both ends have substantially the same potential, so the parasitic capacitance CgdTd has an effect. There is no.
- the relationship between the auxiliary capacitance Cs and the organic EL element capacitance Coled is preferably Cs and Coled.
- the power supply line 10 is negative potential (—VDD)
- the merge line 12 is high potential (VgH)
- the Tth control line 11 is low potential (VgL)
- the scanning line 13 is low potential (VgL)
- the image signal Line 14 is at zero potential.
- the drive transistor Td is turned on, the threshold voltage detection transistor Tth is turned off, and the switching transistor T1 is turned off.
- the current Ids flows through the organic EL element OLED ⁇ drive transistor Td ⁇ power line 10 and the organic EL element OLED emits light.
- Vgs' be the potential at this time, that is, the potential difference between the gate electrode and the source electrode of the driving transistor Td in the light emission period, and the gate electrode-source of the driving transistor Td in the writing period obtained by the above equation (1).
- the potential difference between the electrodes is Vgs
- Vgs ' ((Cs + CgsTth + CgsTd) (Vth-(Cs / Call) Vdata) + CsVdata + CgsTth-(VgL-VgH) + CgdTd-Vds) / Call' (5)
- Vgs " Vgs '+ (CgdTd / Call') Vds ⁇ ⁇ ⁇ (6.2)
- Vgs " ((Cs + CgsTth + CgsTd) ⁇ (Vth-(Cs / Call) ⁇ Vdata) + Cs ⁇ Vdata-CgsTth-VgH-CgsTth-VgL) / Call ' ⁇ ⁇ ⁇ (6.3)
- the Vds term that depends on disappears.
- equation (8) shows the write efficiency.
- the writing efficiency is better when considering the withstand voltage of the driving IC and the adjustment range of the pixel signal line potential.
- the writing efficiency cannot be sufficiently increased due to the parasitic capacitance component.
- the potential difference Vgs between the gate electrode and the source electrode of the driving transistor Td in the writing period when the additional capacitor Cs2 is provided can be expressed by the following equation.
- Vgs Vth— (Cs / (Call + Cs2) 'Vdata ⁇ ⁇ ⁇ (9)
- Vgs ' Cs (Coled + CgdTth + Cs2) / ((Call + Cs2) Call') Vdata
- Equation (12) there is a relationship of Call> Coled + CgdTth, and since ⁇ ′ / ⁇ is always 1 or more, it can be seen that the write efficiency is improved by providing the additional capacitor Cs2. . Since the write efficiency increases as the additional capacity Cs2 increases, the capacity value of the additional capacity Cs2 is preferably 10% or more of Coled (more preferably 30% or more of Coled).
- the capacity of the organic EL element OLED is generally different for each pixel of red, green and blue! /. Therefore, in order to make the write efficiency substantially equal, the red, green and blue organic EL element OLED capacities are set to Coledr, Coledg and Coledb, respectively, and the red, green and blue additional capacities are set to Cs2r, Cs2g and Cs2b, respectively. All values of Coledr + Cs2r, Coledg + Cs2g, Coledb + Cs2b are set within the range of 80% to 100% (more preferably 95% to 100%) of the maximum value among these values. It is preferable to do.
- Vgs amplitude (AVgs) in the red, green, and blue pixel circuits may differ.
- R (Coledr + Cs2r + CgdTth) / (Coledr + Cs2r + Cs + CgsTth + CgdTth + CgsTd
- B (Coledb + Cs2b + CgdTth) / (Coledb + Cs2b + Cs + CgsTth + CgdTth + Cgs Td)
- a Vgsmaxr, ⁇ Vgsmaxg, and ⁇ Vgsmaxb be the maximum values of A Vgs required for each color.
- Cs2r, Cs2g, and Cs2b are determined so that they are at least% (more preferably at least 95%), the desired Vgs amplitude ( ⁇ Vgs) can be obtained for each color with approximately the same pixel signal line amplitude ( ⁇ Vdata). can get.
- the drive transistor Td (driver means) is the threshold voltage detection. It is possible to reduce the influence of parasitic capacitance existing in the transistor Tth (threshold voltage detecting means) and increase the writing efficiency due to the parasitic capacitance.
- amorphous silicon TFT or a polycrystalline TFT is used as an element that embodies the threshold voltage detecting means and the driver means, but instead of this, a polysilicon TFT or the like is used. Other TFTs may be used.
- one end of the additional capacitor Cs2 is connected to the force sword electrode of the organic EL element OLED, and the other end is connected to the power supply line 10.
- the configuration is not limited.
- the other end of the additional capacitor Cs2 can be connected to the Tth control line 11.
- the Tth control line 11 In addition to the Tth control line 11, it can be connected to a ground line or the like having a fixed potential (constant potential).
- the fixed potential described above does not need to be a constant potential in all of the preparation period, the threshold voltage detection period, the writing period, and the light emitting period, and at least during the writing period. Well, if the constant potential is maintained!
- the meaning of the constant potential does not need to be a constant potential in a strict sense, and the predetermined potential fluctuation can be allowed within the scope of the purpose of obtaining the effect of increasing the writing efficiency by the additional capacitor Cs2. Is.
- FIG. 7 is a configuration example according to the second embodiment of the present invention, and shows a configuration example in which the additional capacitor Cs2 is connected to the Tth control line 11 that controls the threshold voltage detection transistor Tth. It is.
- the additional capacitor Cs2 is applied to the pixel circuit having the configuration shown in FIG. 1 .
- the pixel circuit having a drive transistor and a threshold voltage detection transistor is described. If so, the present invention can also be applied to a pixel circuit having such a connection form.
- the additional calorie capacitor Cs2 having the requirements described in the first embodiment is connected to the gate electrode of the driving transistor.
- FIG. 8 is a diagram illustrating a configuration of a pixel circuit corresponding to one pixel of the image display device according to the third embodiment of the present invention.
- the pixel circuit shown in the figure has a configuration different from that of the pixel circuit shown in FIG. Specifically, the force sword electrode of the organic EL element OLED is connected to the power supply line 10, and the anode electrode is connected to the source electrode of the drive transistor Td. The drain electrode of the drive transistor Td is connected to the ground line.
- the gate electrode is connected to the connection portion of the switching transistors Tl and T2 and indirectly connected to the image signal line 14 via the switching transistor T1.
- the gate electrode of the switching transistor T1 is connected to the scanning line 13.
- the gate electrode of the switching transistor T2 is connected to the merge line 12.
- a threshold voltage detection transistor Tth is inserted between the gate electrode and the drain electrode of the drive transistor Td, and a Tth control line 11 is connected to the gate electrode.
- the auxiliary capacitor Cs is inserted between the connection part of the switching transistors Tl and T2 and the anode electrode of the organic EL element OLED.
- the additional capacitor Cs2 used in the above-described embodiment is connected to the auxiliary capacitor Cs and the power source so that the auxiliary capacitor Cs and the auxiliary capacitor Cs are connected in series during the writing period of the image signal potential, as will be described later. Inserted between line 10.
- the drive transistor Td! / The side connected to the anode electrode of the organic EL element OLED is the source electrode, and the side connected to the ground line is the drain electrode. These forces may be configured by reversing these electrodes.
- the operation of the third embodiment will be described with reference to the sequence diagram of FIG. Note that, similarly to the first embodiment, the description will be divided into four periods of a preparation period, a threshold voltage detection period, a writing period, and a light emission period.
- the power supply line 10 is at a high potential (Vp)
- the merge line 12 is at a high potential (VgH)
- Tt h The control line 11 is at low potential (VgL)
- the scanning line 13 is at low potential (VgL)
- the image signal line 14 is at zero potential.
- the threshold voltage detection transistor Tth is turned off
- the switching transistor T1 is turned off
- the driving transistor Td is turned on
- the switching transistor T2 is turned on.
- the driving transistor Td is turned on because the on-state of the switching transistor T2 is maintained from the light emission period, and the supply of charge from the auxiliary capacitor Cs continues to the gate electrode of the driving transistor Td. Because it does.
- the merge line 12 is set to a low potential (VgL) to turn off the switching transistor T2, and then the Tth control line
- VgL low potential
- Tth control line The threshold voltage detection transistor Tth is turned on by setting 11 to a high potential (VgH) because the charge accumulated in the organic EL element capacitor Coled is retained.
- the merge line 12 has a low potential (VgL)
- the Tth control line 11 has a high potential (VgH)
- the scan line 13 has a low potential (VgL).
- the zero potential of the image signal line 14 is maintained. Therefore, by maintaining the threshold voltage detection transistor Tth on, the gate electrode and the drain electrode of the drive transistor Td are short-circuited, and the gate electrode is connected to the ground line via the drain electrode. . For this reason, a zero potential is applied to the gate electrode and the drain electrode of the driving transistor Td.
- the organic EL element OLED is connected to the source electrode of the driving transistor Td, it is based on the negative charge accumulated on the anode electrode side of the organic EL element OLED.
- the potential difference between the gate electrode and the source electrode of the drive transistor Td becomes larger than the threshold voltage Vth of the drive transistor Td, and the drive transistor Td is turned on.
- the drain electrode of the drive transistor Td is electrically connected to the ground line, and the source electrode of the drive transistor Td is connected to the organic EL element OLED in which negative charges are accumulated.
- a directional current flows through the drain electrode force and the source electrode based on the potential difference generated between the gate electrode and the source electrode.
- the absolute value of the negative charge accumulated in the organic EL element OLED gradually decreases, and the potential difference between the gate electrode and the source electrode of the driving transistor Td also gradually decreases.
- the driving transistor Td When the potential difference between the gate electrode and the source electrode of the driving transistor Td decreases to the threshold voltage (Vth), the driving transistor Td is turned off, and the absolute value of the negative charge accumulated in the organic EL element OLED is calculated. The decline also stops. In addition, since the gate electrode of the drive transistor Td is connected to the ground line, the source electrode potential of the drive transistor Td is maintained at (one Vth) when the drive transistor Td is turned off. Become. With the above operation, the threshold voltage (Vth) of the drive transistor Td is detected.
- the data potential (Vdata) from the image signal line 14 is indirectly or directly supplied to the auxiliary capacitor Cs, so that the gate electrode potential of the drive transistor Td is variably controlled to the desired potential.
- the zero potential of the power supply line 10 the low potential (VgL) of the merge line 12 and the high potential (VgH) of the Tth control line 11 are maintained, while the scanning line 13 is maintained at the high potential (VgH).
- the image signal line 14 is set to the data potential (Vdata).
- the auxiliary capacitor Cs and the organic EL element capacitor Coled are electrically connected in series, and the additional capacitor Cs2 and the organic EL element capacitor Coled are electrically connected in parallel.
- the image signal line 14 supplies a potential corresponding to the luminance of the organic EL element OLED, the potential of zero potential changes to the potential Vdata corresponding to the luminance of the organic EL element OLED.
- This potential Vdata is written to the auxiliary capacitor Cs through the switching transistor T1 that is controlled to be turned on by setting the scanning line 13 to the high potential (VgH), and the scanning line 13 is set to the low potential (VgL).
- VgH high potential
- VgL low potential
- the potential of the Tth control line 11 is high In order to prepare for the potential of the merge line 12 to be set to a high potential (VgH) during the next light emission period, the potential of the Tth control line 11 is lowered during this writing period. It is preferable to set the potential (VgL).
- the power supply line 10 is set to a negative potential (—VDD)
- the merge line 12 is set to a high potential (VgH)
- the Tth control line 11 has a low potential (VgL)
- the scanning line 13 has a low potential (VgL)
- the zero potential of each image signal line 14 is maintained.
- the drive transistor Td is turned on
- the threshold voltage detection transistor Tth is turned off
- the switching transistor T1 is turned off
- the organic EL element OLED emits light.
- the source electrode of the organic EL element OLED is based on the threshold voltage detected during the threshold voltage detection period!
- the writing efficiency of the pixel circuit shown in FIG. 8 will be considered.
- the write efficiency in the absence of the additional capacitor Cs2 is 7 to 2
- Call2 is a capacitance connected to the gate electrode of the drive transistor Td in the writing period, and can be expressed as the following formula.
- the write efficiency can be expressed by the ratio of the Vgs swing width (AVgs) and the pixel signal line swing width (AVdata). Therefore, in order to increase the writing efficiency, it is preferable to make the Vgs swing width (AVgs) as close as possible to the pixel signal line swing width (AVdata).
- the data potential (Vdata) from the image signal line 14 is written.
- Auxiliary capacitor Cs has a capacitive component connected in series when image data is written. For example, in the pixel circuit shown in FIG. 8, the organic EL element capacitance Coled corresponds to one of the capacitance components.
- the organic EL element capacitance Coled may not be connected in series to the auxiliary capacitance Cs.
- the drive transistor Td, the threshold voltage detection transistor Tth, and the switching transistor Of the parasitic capacitances of the stars Tl and T2 affects the writing efficiency.
- Vs Coled / (Cs + Coled) -V12 (19)
- equation (19) indicates that when there is a capacitance component connected in series with the auxiliary capacitance Cs to which the data potential (Vdata) of the image signal line 14 is written, the auxiliary capacitance Cs A part of the electric charge stored in the capacitor is taken away by the capacitive component connected in series, resulting in a decrease in writing efficiency, and the voltage applied to both ends of the auxiliary capacitor Cs depends on the auxiliary capacitor Cs. If it increases in proportion to the capacitance component connected in series (ie, the capacitance component of the connection partner), it suggests two points of view.
- the additional capacitor Cs2 provided in addition to the auxiliary capacitor Cs is configured to be connected in series to the auxiliary capacitor Cs at least when writing the data potential. To do. Further, it is preferable to select a capacity value of the additional capacity Cs2 having a capacity value larger than the auxiliary capacity Cs.
- Green and blue organic EL elements OLED capacity is Coledr, Coledg, Coledb respectively
- red, green and blue additional capacity is Cs2r, Cs2g and Cs2b respectively
- Coledr + Cs2r, Coledg + Cs2g + All values of Cs2b should preferably be set within the range of 80% to L00% (more preferably 95% to L00%) of the maximum value among these values. Good.
- the required V gs amplitude (A Vgs) in each pixel circuit may be different for each color of red, green, and blue.
- the writing efficiency of each color is set as r? R, r? G, and ⁇ b, respectively, and the required maximum ⁇ Vgs for each color is set as ⁇ ⁇ gsmaxr, ⁇ Vgsmaxg, and ⁇ Vgsmaxb.
- the maximum value of ⁇ Vgsmaxr / ⁇ r, ⁇ Vgsmaxg / ⁇ g, ⁇ Vgsmaxb / ⁇ b, the maximum value of ⁇ Vgsmaxr / ⁇ r, ⁇ Vgsmaxg / ⁇ g, ⁇ Vgsmaxb / ⁇ b If Cs2r, Cs2g, and Cs2b are set to 90% or more (more preferably 95% or more), the desired Vgs swing width ( ⁇ Vgs) can be obtained for each color with approximately the same pixel signal line swing width (A Vdata). It is done.
- the image display device of this embodiment in addition to the first capacitor element in which image data is written, it is serially connected to the first capacitor element during the writing period of the image data.
- the second capacitor element that is connected to the first capacitor element the potential written to the first capacitor element is reflected well in the first capacitor element. As a result, it is possible to improve the writing efficiency of the image display device.
- one end of the additional capacitor Cs2 is connected to the force sword electrode of the organic EL element OLED, and the other end is connected to the power supply line 10.
- the configuration is not limited.
- the other end of the additional capacitor Cs2 may be connected to a ground line having a fixed potential (constant potential).
- the fixed potential here does not need to be a constant potential in all of the preparation period, the threshold voltage detection period, the writing period, and the light emission period, and at least the threshold voltage detection period. During the writing period, the constant potential should be maintained! /.
- the meaning of the constant potential is not necessarily a constant potential in a strict sense, and the predetermined potential fluctuation can be allowed within the scope of the purpose of obtaining the effect of increasing the writing efficiency by the additional capacitor Cs2. is there.
- the other end of the additional capacitor Cs2 is the Tth control line 11 (see FIG. 11) or the merge line 12 (see FIG. 12) in which a substantially constant potential is maintained from the threshold voltage detection period to the writing period. You can connect to.
- the example in which the additional capacitor is applied to the pixel circuit having the configuration shown in FIG. 8 has been described.
- any pixel circuit having a drive transistor and a threshold voltage detection transistor may be used.
- the present invention can be applied to pixel circuits of any connection form.
- an additional capacitor having the requirements described in Embodiment 3 may be connected to the gate electrode of the driving transistor.
- the image display device is useful for preventing a decrease in writing efficiency in a pixel circuit.
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Abstract
Description
Claims
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US11/892,558 US9013373B2 (en) | 2005-02-25 | 2007-08-23 | Image display device |
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JP (1) | JP4782103B2 (ja) |
KR (1) | KR100893135B1 (ja) |
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WO (1) | WO2006090560A1 (ja) |
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Also Published As
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KR100893135B1 (ko) | 2009-04-15 |
US20080088546A1 (en) | 2008-04-17 |
JP4782103B2 (ja) | 2011-09-28 |
CN100541578C (zh) | 2009-09-16 |
CN101116130A (zh) | 2008-01-30 |
KR20070092742A (ko) | 2007-09-13 |
US9013373B2 (en) | 2015-04-21 |
JPWO2006090560A1 (ja) | 2008-07-24 |
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