WO2014190617A1 - 发光二极管像素单元电路和显示面板 - Google Patents
发光二极管像素单元电路和显示面板 Download PDFInfo
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- WO2014190617A1 WO2014190617A1 PCT/CN2013/081022 CN2013081022W WO2014190617A1 WO 2014190617 A1 WO2014190617 A1 WO 2014190617A1 CN 2013081022 W CN2013081022 W CN 2013081022W WO 2014190617 A1 WO2014190617 A1 WO 2014190617A1
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- thin film
- film transistor
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- 239000010409 thin film Substances 0.000 claims abstract description 177
- 239000003990 capacitor Substances 0.000 claims abstract description 66
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 229920001621 AMOLED Polymers 0.000 description 16
- 238000010586 diagram Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000003321 amplification Effects 0.000 description 4
- 238000007667 floating Methods 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
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- 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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- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- 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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- 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]
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- 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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- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
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- 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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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
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Definitions
- the present invention relates to the field of display technologies, and in particular, to an LED pixel unit circuit and a display panel. Background technique
- the active matrix-Organic Light Emitting Diode (AMOLED) display panel Compared with the conventional liquid crystal panel, the active matrix-Organic Light Emitting Diode (AMOLED) display panel has the characteristics of faster response speed, higher contrast ratio and wider viewing angle.
- the pixels of the AMOLED display panel are driven by the relevant driving circuit on the array (Array) substrate for illumination display.
- Array array
- FIG. 1 shows a prior art 2T1C pixel driving circuit. As can be seen from FIG.
- the prior art 2T1C pixel driving circuit includes two thin film transistors (TFTs, Thin-Film Transistors) and one capacitor, wherein the thin film transistor M1 functions as a switch for controlling data lines and
- the connection of the gate of the thin film transistor DTFT, which is a driving thin film transistor, is capable of generating a driving current in a saturated state to drive the OLED to emit light.
- 2 is a timing diagram of the scan signal G(n) on the scan line of the pixel driving circuit shown in FIG. 1 and the gray scale voltage signal Vd on the data line.
- the scan signal is low level, the thin film transistor M1 is turned on, and the data is turned on.
- the gray scale voltage Vd on the line charges the capacitor C.
- the thin film transistor M1 When the scan signal is high, the thin film transistor M1 is turned off, and the capacitor C is used to store the gray scale voltage. Since the power supply positive voltage VDD potential is high, the DTFT is in a saturated state. At this time, the driving current I of the OLED is:
- Vsg is the gate-to-source voltage of the DTFT
- Vth is the threshold voltage of the DTFT
- VDD is the positive voltage of the power supply
- Vd is the grayscale voltage on the data line
- K is a constant related to the transistor size and carrier mobility, once The TFT size and process are determined, K is determined.
- Embodiments of the present invention provide an LED pixel unit circuit and a display panel for solving the problem of uneven brightness of a display panel caused by different threshold voltages of the thin film transistors.
- the embodiment of the invention provides a pixel unit circuit of a light emitting diode, the circuit includes a driving module and a light emitting diode, wherein the driving module comprises: a driving thin film transistor, a first switching element, a first capacitor, a second capacitor, and Drive control unit; wherein
- the gate of the driving thin film transistor is connected to the first node, the source is connected to the positive voltage output end of the power source, and the drain is connected to the anode of the light emitting diode;
- the cathode of the light emitting diode is connected to a negative voltage output end of the power source;
- the first capacitor is located between the first node and the first switching element
- the second capacitor is located between the positive voltage output of the power source and the first node;
- the first switching element is connected in series between the first capacitor and the data line;
- the driving control unit includes a matching thin film transistor whose threshold voltage is matched with a threshold voltage of the driving thin film transistor, is located between the positive voltage output end of the power source and the first node, and is used for charging and discharging by controlling the second capacitor, and saving
- the threshold voltage of the matching thin film transistor in the driving control unit is equal to the threshold voltage of the driving thin film transistor and thereby compensates the threshold voltage of the driving thin film transistor.
- the driving control unit further includes a second switching element; wherein the second switching element is connected in series between the power positive voltage output terminal and the second node; the matching thin film transistor functions as a third switching element, And connected in series between the first node and the second node.
- the driving circuit further includes a sensing module
- the sensing module includes: a fourth switching element, a fifth switching element, a third capacitor, an amplifying thin film transistor, and an inductive element; wherein the fourth switching element is connected in series Between the second node and the gate of the amplifying thin film transistor; the fifth switching element is connected in series between the drain of the amplifying thin film transistor and the sensing line; the third capacitor is connected in series to the gate and the fifth of the amplifying thin film transistor
- the sensing element is connected to the gate of the amplifying thin film transistor; the driving control unit charges and discharges the third capacitor of the sensing module, so that the touch signal in the sensing module passes through the sensing module
- the amplifying thin film transistor is amplified.
- the switching elements are all thin film transistors; specifically, the first switching element is a first thin film transistor, the second switching element is a second thin film transistor, and the third switching element is a third The thin film transistor, the fourth switching element is a fourth thin film transistor, and the fifth switching element is a fifth thin film transistor.
- the gate of the first thin film transistor is connected to the scan signal of the pixel of the row, the source is connected to the data line, and the drain is connected to one end of the first capacitor; the gate of the second thin film transistor is connected to the line.
- the source is connected to the positive voltage output end of the power supply, and the drain is connected to the source of the third thin film transistor; the gate and the drain of the third thin film transistor are simultaneously connected to the first node, the source and the second thin film transistor a drain connection; a gate of the fourth thin film transistor is connected to a control signal of the pixel of the row, a source is connected to the second node, and a drain is connected to a gate of the amplifying thin film transistor; and a gate of the fifth thin film transistor is connected A row of pixel scanning signals, the source is connected to the drain of the amplifying thin film transistor, and the drain is connected to the sensing line.
- the gate of the amplifying thin film transistor is connected to the drain of the fourth thin film transistor, the source is connected to the positive voltage of the power source, and the drain is connected to the source of the fifth thin film transistor; the third capacitor is connected to the amplifying thin film transistor Between the gate and the gate of the fifth thin film transistor, a potential for maintaining the gate of the amplifying thin film transistor is caused to operate the amplifying thin film transistor in the amplification region.
- all of the thin film transistors are P-type thin film transistors.
- the thin film transistors are all polysilicon thin film transistors, or both are amorphous silicon thin film transistors, or both are oxide thin film transistors.
- the sensing element is an inductive electrode for forming a sensing capacitance with a human body when a person touches the sensing electrode.
- Embodiments of the present invention provide a display panel, which includes the pixel unit circuit of the above-described light emitting diode.
- the pixel unit circuit provided by the embodiment of the invention includes a driving module and a light emitting diode, wherein the driving module is provided with a driving thin film transistor, a first switching element, a first capacitor, a second capacitor and a driving control unit, through the driving control unit Charging and discharging the second capacitor, storing a threshold voltage of the matching thin film transistor in the driving control unit equal to the threshold voltage of the driving thin film transistor and thereby compensating the threshold voltage, so that the driving current for driving the light emitting diode is not driven by the driving film
- the threshold voltage of the transistor at the same time, the voltage across the second capacitor is the gate-source voltage of the driving thin film transistor, and the gate of the driving thin film transistor is in a floating state during operation, and one end of the second capacitor is connected to the gate of the driving thin film transistor, The other end of the second capacitor is connected to the positive voltage of the power supply, and the voltage difference across the second capacitor is not affected by the internal resistance of the line, thereby eliminating the influence of the internal resistance of the
- 1 is a 2T1C pixel driving circuit in the prior art
- 2 is a signal timing diagram of each signal terminal of the 2T1C pixel driving circuit
- FIG. 3 is a circuit diagram of a pixel driving circuit according to an embodiment of the present invention.
- FIG. 4 is a signal timing diagram of each signal terminal in a pixel driving circuit according to an embodiment of the present invention
- FIG. 5 is a first phase equivalent circuit diagram of a pixel driving circuit according to an embodiment of the present invention
- FIG. 7 is a third stage equivalent circuit diagram of the pixel driving circuit according to the embodiment of the present invention.
- Embodiments of the present invention provide an LED pixel unit circuit and a display panel for solving the problem of uneven brightness of a display panel caused by different threshold voltages of the thin film transistors.
- FIG. 3 is an active matrix OLED pixel unit circuit according to an embodiment of the present invention.
- the circuit includes: a driving module 31, a sensing module 32, and a light emitting diode 33.
- the driving module 31 includes: a driving thin film transistor DTFT, a first thin film transistor T1, a first capacitor C1, a second capacitor C2, and a driving control unit 311; wherein the driving control unit 311 includes a second thin film transistor T2 And a third thin film transistor T3.
- the gate of the driving thin film transistor DTFT is connected to the first node PI, the source is connected to the positive voltage of the power supply VDD, and the drain is connected to the anode of the active matrix organic light emitting diode AMOLED.
- the first capacitor C1 is located between the first node P1 and the first thin film transistor T1. Specifically, one end of the first capacitor C1 is connected to the first node P1, and the other end is connected to the drain of the first thin film transistor T1.
- the second capacitor C2 is located between the power supply positive voltage VDD output terminal and the first node P1.
- the gate of the first thin film transistor T1 is connected to the scan signal G(n) of the pixel of the row, the source is connected to the data line Ldata, and the drain is connected to one end of the first capacitor C1.
- the gate of the second thin film transistor T2 is connected to the control signal C(n) of the pixel of the row, the source is connected to the power supply positive voltage VDD output terminal, and the drain is connected to the source of the third thin film transistor T3.
- the gate and the drain of the third thin film transistor T3 are simultaneously connected to the first node P1, and the source is connected to the drain of the second thin film transistor T2.
- the sensing module 32 includes: a third capacitor C3, an amplifying thin film transistor ATFT, a sensing electrode 321, The fourth thin film transistor T4 and the fifth thin film transistor T5.
- the gate of the fourth thin film transistor T4 is connected to the control signal C(n) of the pixel of the row, the source is connected to the second node P2, and the drain is connected to the gate of the amplifying thin film transistor ATFT.
- the gate of the fifth thin film transistor T5 is connected to the scanning signal G ( n+1 ) of the pixel of the next row, the source is connected to the drain of the amplifying thin film transistor ATFT, and the drain is connected to the sensing line Lsense.
- the gate of the amplifying thin film transistor ATFT is connected to the drain of the fourth thin film transistor, the source is connected to the output terminal of the power supply positive voltage VDD, and the drain is connected to the source of the fifth thin film transistor.
- the third capacitor C3 is connected between the gate of the amplifying thin film transistor ATFT and the gate of the fifth thin film transistor.
- the sensing electrode 321 is connected to the gate of the amplifying thin film transistor ATFT for forming a sensing capacitor Cf with the human body when the human touches the sensing electrode, causing a change in the potential of the gate of the ATFT to generate a varying induced current.
- the anode of the active matrix organic light emitting diode AMOLED is connected to drive the drain of the thin film transistor DTFT, and the cathode is connected to the negative voltage VSS of the power supply.
- FIG. 4 is a timing diagram of each signal terminal. The working method of the active matrix OLED pixel unit circuit according to the embodiment of the present invention is described below with reference to FIG. 4, wherein all the thin film transistors are low-level conduction, high level. cutoff.
- FIG. 5 is an equivalent circuit diagram of the stage; the scanning signal G(n+1) of the next row of pixels is at a high level VGH, so that the scanning signal G (n+) in response to the next row of pixels
- the fifth thin film transistor T5 of 1) is turned off, and the drain of the amplifying thin film transistor ATFT is in an vacant state.
- the scanning signal G(n) of the pixel of the row is a low level VGL
- the control signal C(n) of the pixel of the row is a low level VGL
- the first thin film transistor T1, the second thin film transistor ⁇ 2, and the third thin film transistor ⁇ 3 and the fourth thin film transistor ⁇ 4 are turned on;
- the gray scale voltage signal Vd outputted on the data line Ldata has a gray scale voltage of Vh, and charges the first capacitor C1 such that the first capacitor C1 is close to the first thin film transistor T1.
- Vd VDD-l Vth3l-Vh
- V Cl the voltage across the first capacitor CI
- Vth3 the threshold voltage of the third thin film transistor T3.
- the power supply positive voltage VDD charges the third capacitor C3 such that the third capacitor C3 is close to one end of the amplifying thin film transistor ATFT, that is, the potential at the fourth node P4 rises to VDD, and the other end of the third capacitor C3, that is, the fifth node P5
- Vc 3 VDD-VGH
- Vc 3 is the voltage across the third capacitor C3.
- FIG. 6 is an equivalent circuit diagram of the stage; G(n) is kept low, G(n+1) is kept high, and therefore, the first thin film transistor T1 is in a conducting state.
- the fifth thin film transistor is still in an off state; C ( n ) jumps to a high level, the second thin film transistor T2 and the fourth thin film transistor T4 are turned off, and the third thin film transistor T3 is kept in an off state. Since the second thin film transistor T2, the fourth thin film transistor T4, and the third thin film transistor T3 are turned off, the gate of the driving thin film transistor DTFT is in a floating state; meanwhile, the voltage on the data line jumps from the high level Vh to the low level. Vdata, due to the coupling effect of the first capacitor C1, the potential at the first node P1 also changes. At this time, the potential of the gate of the driving TFTD DTFT is:
- Vpl VDD- ⁇ 31+ ( Vdata- Vh ) *C1/(C1+C2)
- Vpl is the potential of driving the gate of the thin film transistor DTFT.
- the position of the third thin film transistor T3 and the position of the driving thin film transistor DTFT are very close, and the process environment is also very uniform, so the electrical difference caused by the process is very small, and the power of the two can be approximated.
- the threshold voltage Vth3 of the third thin film transistor T3 is the same as the threshold voltage Vthd of the driving thin film transistor DTFT, and the third thin film transistor T3 can serve as a matching tube for driving the thin film transistor DTFT for compensating with the second capacitor C2.
- the threshold voltage Vthd of the driving thin film transistor DTFT cancels the influence of the threshold voltage of the driving thin film transistor DTFT on the driving current.
- Vpl of the gate of the driving TFTD DTFT is:
- Vpl VDD- ⁇ dl+ ( Vdata- Vh ) *C1/(C1+C2)
- Vthd is the threshold voltage of the driving thin film transistor DTFT.
- the third stage S3, see Fig. 7, Fig. 7 is the equivalent circuit diagram of the stage; G(n) jumps to the high level VGH, the first thin film transistor T1 is turned off; C(n) remains high level, the second film The transistor T2, the fourth thin film transistor ⁇ 4, and the third thin film transistor ⁇ 3 are turned off, and the thin film transistor DTFT is driven.
- the gate is still floating, and its potential remains unchanged. At this time, the voltage between the gate and the source of the driving thin film transistor DTFT is:
- Vsg Vs-Vpl
- VDD-[ VDD-IVthdl+ ( Vdata-Vh ) *C1/(C1+C2)] (Vh- Vdata ) *Cl/(Cl+C2)+IVthdl
- Vsg is the voltage between the gate and the source of the driving thin film transistor DTFT
- Vs is the potential of driving the source of the thin film transistor DTFT
- Vpl is the potential of driving the gate of the thin film transistor DTFT.
- the saturation current of the thin film transistor DTFT that is, the light emission current I of the AMOLED is driven.
- G(n+1) jumps to a low level VGL, so that the fifth thin film transistor T5 is turned on; since the fourth thin film transistor T4 is turned off, the gate of the amplifying thin film transistor ATFT is suspended, so when the G(n+1) potential jumps When the level is low, the gate potential of the fourth node P4, that is, the amplifying thin film transistor ATFT, also jumps downward by the coupling action of the third capacitor C3.
- the magnitude of the change in the gate potential of the ATFT of the amplifying thin film transistor is related to whether or not there is a touch action on the sensing electrode 321 connected to the gate thereof.
- the coupling capacitance Cf is formed between the human body and the sensing electrode 321, so that the potential Vp4 of the fourth node P4 is:
- Vp4 VDD+ ( VGL-VGH ) * C3/(C3+Cf)
- the magnitude of the induced current Ise passing through the sensing line Lsense is:
- Vtha is the threshold voltage of the amplification tube
- Ka is the constant of the amplification tube related to the process and design.
- Vp4 VDD - (VGH - VGL )
- V 2 sg between the source and the gate of the amplifying thin film transistor ATFT is:
- VDD-[ VDD- ( VGH-VGL ) ] VGH-VGL;
- the magnitude of the induced current Ise passing through the sensing line Lsense is:
- the circuit can determine whether there is a touch action by sensing current.
- the embodiment of the invention further provides a display panel, which comprises the above-mentioned active matrix organic light emitting diode AMOLED pixel unit circuit.
- the active matrix AMOLED pixel unit circuit includes a driving module and a sensing module.
- the driving module is provided with a driving thin film transistor, a first thin film transistor, a second thin film transistor, and a third thin film transistor.
- the first capacitor and the second capacitor by controlling charging and discharging of the second capacitor, storing a threshold voltage of the matching tube equal to the threshold voltage of the driving tube and thereby compensating the threshold voltage of the driving tube, so as to drive the LED to emit light
- the driving current is not affected by the threshold voltage of the driving thin film transistor.
- the voltage across the second capacitor is the gate-source voltage of the driving transistor, and the gate of the driving transistor is in a floating state during operation, and the other end of the second capacitor is connected to the power supply.
- the voltage difference across the second capacitor is not affected by the internal resistance of the line. Therefore, the influence of the internal resistance of the line on the light-emitting circuit is eliminated, so that the driving current of the AMOLED is the same under the same gray-scale voltage in the pixel circuit.
- the brightness of the display panel of the circuit does not differ, and the brightness of the display panel is improved. One sex.
- the present invention further integrates the touch module in the circuit, and multiplexes the control signal in the drive control module, the second thin film transistor in response to the control signal, and the scan signal of the pixel of the row to charge the third capacitor. And through the coupling of the finger touch, the finger touch signal is amplified by the amplifying thin film transistor without increasing the circuit structure and operation complexity. The touch function of the display panel is well realized. In addition, a single P-type thin film transistor is used in the circuit, which reduces the complexity and cost of the fabrication process.
- the above embodiment is described by taking a single P-type thin film transistor as an example, the above circuit can be easily changed to use a single N-type thin film transistor or a CMOS transistor circuit; The touch function portion is removed, and the driving touch circuit is changed to a pure pixel light emitting driving circuit.
- the above description has been made by taking an active matrix organic light emitting diode as an example, the present invention is not limited to a display device using an active matrix organic light emitting diode, and can be applied to a display device using other various light emitting diodes. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Computer Hardware Design (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
Abstract
Description
Claims
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CN103700346B (zh) * | 2013-12-27 | 2016-08-31 | 合肥京东方光电科技有限公司 | 像素驱动电路、阵列基板、显示装置和像素驱动方法 |
CN103996376B (zh) | 2014-05-14 | 2016-03-16 | 京东方科技集团股份有限公司 | 像素驱动电路、驱动方法、阵列基板及显示装置 |
CN104064140B (zh) | 2014-06-09 | 2016-09-21 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、有机发光显示面板及显示装置 |
CN104103239B (zh) * | 2014-06-23 | 2016-05-04 | 京东方科技集团股份有限公司 | 有机发光二极管像素电路及其驱动方法 |
CN104282265B (zh) | 2014-09-26 | 2017-02-01 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、有机发光显示面板及显示装置 |
CN104464625B (zh) | 2014-12-10 | 2016-09-21 | 合肥鑫晟光电科技有限公司 | 像素电路及其驱动方法、阵列基板、显示装置 |
CN105094448B (zh) * | 2015-09-01 | 2018-02-27 | 京东方科技集团股份有限公司 | 转换电路、转换方法和触控面板 |
CN105843443B (zh) * | 2016-03-17 | 2018-09-11 | 京东方科技集团股份有限公司 | 一种触摸感测电路及显示装置 |
CN108877649B (zh) * | 2017-05-12 | 2020-07-24 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、显示面板 |
CN106991968B (zh) | 2017-05-27 | 2020-11-27 | 京东方科技集团股份有限公司 | 像素补偿电路及补偿方法、显示装置 |
CN108174124B (zh) * | 2018-01-29 | 2021-02-19 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法以及探测器 |
US11462165B2 (en) * | 2019-07-02 | 2022-10-04 | Beijing Boe Technology Development Co., Ltd. | Pixel driving circuit, related driving method, pixel circuit, and display panel |
Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998048403A1 (en) * | 1997-04-23 | 1998-10-29 | Sarnoff Corporation | Active matrix light emitting diode pixel structure and method |
CN1679073A (zh) * | 2002-09-05 | 2005-10-05 | 皇家飞利浦电子股份有限公司 | 电致发光显示器件 |
US20080246785A1 (en) * | 2007-03-26 | 2008-10-09 | Casio Computer Co., Ltd. | Emission apparatus and drive method therefor |
US20090284511A1 (en) * | 2005-11-28 | 2009-11-19 | Kyocera Corporation | Image Display Apparatus and Driving Method Thereof |
CN101996579A (zh) * | 2010-10-26 | 2011-03-30 | 华南理工大学 | 有源有机电致发光显示器的像素驱动电路及其驱动方法 |
CN202110796U (zh) * | 2011-06-23 | 2012-01-11 | 华南理工大学 | 有源有机发光二极管显示器交流像素驱动电路 |
JP2012008228A (ja) * | 2010-06-22 | 2012-01-12 | Hitachi Displays Ltd | 画像表示装置 |
CN102646386A (zh) * | 2011-05-13 | 2012-08-22 | 京东方科技集团股份有限公司 | 一种像素单元电路、像素阵列、面板及面板驱动方法 |
CN102654973A (zh) * | 2011-08-15 | 2012-09-05 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、显示面板 |
CN102682704A (zh) * | 2012-05-31 | 2012-09-19 | 广州新视界光电科技有限公司 | 有源有机电致发光显示器的像素驱动电路及其驱动方法 |
CN102708791A (zh) * | 2011-12-01 | 2012-10-03 | 京东方科技集团股份有限公司 | 像素单元驱动电路和方法、像素单元以及显示装置 |
GB2495117A (en) * | 2011-09-29 | 2013-04-03 | Cambridge Display Tech Ltd | Display driver circuits for OLED displays |
CN103310729A (zh) * | 2013-05-29 | 2013-09-18 | 京东方科技集团股份有限公司 | 发光二极管像素单元电路和显示面板 |
CN203242307U (zh) * | 2013-05-29 | 2013-10-16 | 京东方科技集团股份有限公司 | 发光二极管像素单元电路和显示面板 |
CN203325408U (zh) * | 2013-05-29 | 2013-12-04 | 京东方科技集团股份有限公司 | 发光二极管像素单元电路和显示面板 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4123084B2 (ja) | 2002-07-31 | 2008-07-23 | セイコーエプソン株式会社 | 電子回路、電気光学装置、及び電子機器 |
CN1922470A (zh) * | 2004-02-24 | 2007-02-28 | 彩光公司 | 用于平板显示器的光笔和触摸屏数据输入系统和方法 |
KR100599596B1 (ko) * | 2004-05-17 | 2006-07-13 | 삼성에스디아이 주식회사 | 발광 표시 장치 |
US20070126663A1 (en) * | 2005-12-07 | 2007-06-07 | Gyu Hyun Kim | Pixel driving circuit with threshold voltage compensation circuit |
KR101008438B1 (ko) * | 2008-11-26 | 2011-01-14 | 삼성모바일디스플레이주식회사 | 화소 및 이를 이용한 유기전계발광 표시장치 |
WO2010122807A1 (ja) | 2009-04-24 | 2010-10-28 | ミツミ電機株式会社 | 個人認証装置 |
CN102629447B (zh) * | 2011-10-21 | 2014-06-11 | 京东方科技集团股份有限公司 | 像素电路及其补偿方法 |
KR102023598B1 (ko) * | 2012-11-20 | 2019-09-23 | 삼성디스플레이 주식회사 | 화소, 이를 포함하는 표시장치 및 그 구동 방법 |
-
2013
- 2013-05-29 CN CN201310205666.6A patent/CN103310728B/zh active Active
- 2013-08-07 US US14/371,503 patent/US9947267B2/en active Active
- 2013-08-07 WO PCT/CN2013/081022 patent/WO2014190617A1/zh active Application Filing
Patent Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998048403A1 (en) * | 1997-04-23 | 1998-10-29 | Sarnoff Corporation | Active matrix light emitting diode pixel structure and method |
CN1679073A (zh) * | 2002-09-05 | 2005-10-05 | 皇家飞利浦电子股份有限公司 | 电致发光显示器件 |
US20090284511A1 (en) * | 2005-11-28 | 2009-11-19 | Kyocera Corporation | Image Display Apparatus and Driving Method Thereof |
US20080246785A1 (en) * | 2007-03-26 | 2008-10-09 | Casio Computer Co., Ltd. | Emission apparatus and drive method therefor |
JP2012008228A (ja) * | 2010-06-22 | 2012-01-12 | Hitachi Displays Ltd | 画像表示装置 |
CN101996579A (zh) * | 2010-10-26 | 2011-03-30 | 华南理工大学 | 有源有机电致发光显示器的像素驱动电路及其驱动方法 |
CN102646386A (zh) * | 2011-05-13 | 2012-08-22 | 京东方科技集团股份有限公司 | 一种像素单元电路、像素阵列、面板及面板驱动方法 |
CN202110796U (zh) * | 2011-06-23 | 2012-01-11 | 华南理工大学 | 有源有机发光二极管显示器交流像素驱动电路 |
CN102654973A (zh) * | 2011-08-15 | 2012-09-05 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、显示面板 |
GB2495117A (en) * | 2011-09-29 | 2013-04-03 | Cambridge Display Tech Ltd | Display driver circuits for OLED displays |
CN102708791A (zh) * | 2011-12-01 | 2012-10-03 | 京东方科技集团股份有限公司 | 像素单元驱动电路和方法、像素单元以及显示装置 |
CN102682704A (zh) * | 2012-05-31 | 2012-09-19 | 广州新视界光电科技有限公司 | 有源有机电致发光显示器的像素驱动电路及其驱动方法 |
CN103310729A (zh) * | 2013-05-29 | 2013-09-18 | 京东方科技集团股份有限公司 | 发光二极管像素单元电路和显示面板 |
CN203242307U (zh) * | 2013-05-29 | 2013-10-16 | 京东方科技集团股份有限公司 | 发光二极管像素单元电路和显示面板 |
CN203325408U (zh) * | 2013-05-29 | 2013-12-04 | 京东方科技集团股份有限公司 | 发光二极管像素单元电路和显示面板 |
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