WO2020215418A1 - 一种像素驱动电路和显示装置 - Google Patents

一种像素驱动电路和显示装置 Download PDF

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Publication number
WO2020215418A1
WO2020215418A1 PCT/CN2019/087727 CN2019087727W WO2020215418A1 WO 2020215418 A1 WO2020215418 A1 WO 2020215418A1 CN 2019087727 W CN2019087727 W CN 2019087727W WO 2020215418 A1 WO2020215418 A1 WO 2020215418A1
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Prior art keywords
triode
pixel
red
sub
storage capacitor
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Ceased
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PCT/CN2019/087727
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English (en)
French (fr)
Inventor
张丽君
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Application filed by Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority to US16/603,452 priority Critical patent/US20210358388A1/en
Publication of WO2020215418A1 publication Critical patent/WO2020215418A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • 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]
    • 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
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • 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
    • 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
    • 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
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0297—Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • This application relates to the field of display technology, in particular to a pixel drive circuit and a display device.
  • MicroLED panels are voltage-to-current driving mode, that is, the input terminal provides a voltage signal, which is converted into the current flowing through the LED by the pixel circuit, and then the input voltage can be changed.
  • the signal changes the current value flowing through the LEDs in each pixel, thereby achieving the purpose of controlling the panel brightness and grayscale.
  • red LEDs due to the large difference in luminous efficiency of red, green and blue micro LEDs, especially the luminous efficiency of red LEDs is obviously lower.
  • the current flowing through the red LED is usually higher than that flowing through the blue LED and the green LED.
  • the current of the LED is 4 ⁇ 5 times higher, that is, when the white or red picture is displayed, the current flowing through the entire panel is larger, and the voltage attenuation when the voltage at the voltage signal input terminal reaches the remote pixel is more obvious, which leads to the panel brightness The uniformity deteriorates.
  • the present application provides a pixel driving circuit and a display device to reduce the driving current of the red photo sub-pixel under the condition of achieving the same brightness, thereby reducing the total current in the display panel, so as to reduce the voltage attenuation and improve the luminescence of the display panel. Uniformity.
  • the embodiment of the present application provides a pixel driving circuit, which includes a blue sub-pixel, a green sub-pixel and a red sub-pixel connected in parallel, wherein the blue sub-pixel includes at least one blue light-emitting diode, The green sub-pixel includes at least one green light-emitting diode, and the red sub-pixel includes at least two red light-emitting diodes connected in series.
  • the number of red light-emitting diodes is greater than the number of blue light-emitting diodes and the number of green light-emitting diodes.
  • the pixel driving circuit further includes: a first triode, the first end of the first triode is connected to one end of the red photon pixel, and the second end of the first triode is input with a first preset voltage, the red photon The other end of the pixel is input with a second preset voltage, the gate of the first triode is used to receive a data signal to control the red photo sub-pixel to emit light; a storage capacitor, one end of the storage capacitor is connected to the gate of the first triode, The other end of the storage capacitor is connected to the first end of the first triode or the second end of the first triode; the second triode, the gate of the second triode is used to receive the scan signal, the second and third The input terminal of the transistor is used for receiving data signals, the output terminal of the second transistor is connected to one end of the storage capacitor, and the data signal is transmitted to the gate of the first transistor through one end of the storage capacitor.
  • a first triode the first end of the first triode is connected to one end of the red photon pixel
  • the first end is one of the source and drain of the first triode
  • the second end is the other of the source and drain of the first triode
  • the pixel driving circuit further includes: a third triode, a third triode
  • the input end of the third transistor is used to receive the compensation data signal
  • the output end of the third transistor is connected to the other end of the storage capacitor
  • the gate of the third transistor is used to receive the compensation scanning signal; when the red sub-pixel is lit, the current
  • the compensation data signal passing through the input end of the third transistor and the data signal passing through the input end of the second transistor jointly charge the storage capacitor, and the storage capacitor after the charge is discharged to make the red photo sub-pixel emit light.
  • the input end of the second triode is one of the source and drain of the second triode, and the output end of the second triode is the other of the source and drain of the second triode.
  • the input end of the third triode is one of the source and drain of the third triode, and the output end of the third triode is the other of the source and drain of the third triode.
  • the voltage value provided by the compensation data signal is smaller than the lighting voltage value of the red photo sub-pixel.
  • the pixel driving circuit further includes: a first scan line, the first scan line is connected to the gate of the second triode for providing scan signals; the first data line, the first data line is connected to the second triode The input terminal of the second scan line is used to provide data signals; the second scan line, the second scan line is connected to the gate of the third transistor, and is used to provide the compensation scan signal; the second data line, the second data line is connected to the third The input end of the triode is used to provide compensation data signals.
  • the driving time of the first scan line is the same as the driving time of the second scan line
  • the driving time of the first data line is the same as the driving time of the second data line
  • the difference between the first preset voltage and the second preset voltage is not less than the threshold voltage of the first triode.
  • At least one blue light emitting diode is a blue light emitting diode
  • at least one green light emitting diode is a green light emitting diode
  • at least two red light emitting diodes connected in series are two red light emitting diodes connected in series.
  • the embodiments of the present application also provide a display device, the display device includes a pixel drive circuit, the pixel drive circuit includes: parallel connected blue sub-pixels, green sub-pixels and red sub-pixels, wherein the blue sub-pixels include At least one blue light-emitting diode, the green sub-pixel includes at least one green light-emitting diode, and the red sub-pixel includes at least two red light-emitting diodes connected in series. The number of red light-emitting diodes is greater than the number of blue light-emitting diodes and the number of green light-emitting diodes.
  • the pixel driving circuit further includes: a first triode, the first end of the first triode is connected to one end of the red photon pixel, and the second end of the first triode is input with a first preset voltage, the red photon The other end of the pixel is input with a second preset voltage, the gate of the first triode is used to receive a data signal to control the red photo sub-pixel to emit light; a storage capacitor, one end of the storage capacitor is connected to the gate of the first triode, The other end of the storage capacitor is connected to the first end of the first triode or the second end of the first triode; the second triode, the gate of the second triode is used to receive the scan signal, the second and third The input terminal of the transistor is used for receiving data signals, the output terminal of the second transistor is connected to one end of the storage capacitor, and the data signal is transmitted to the gate of the first transistor through one end of the storage capacitor.
  • a first triode the first end of the first triode is connected to one end of the red photon pixel
  • the first end is one of the source and drain of the first triode
  • the second end is the other of the source and drain of the first triode
  • the pixel driving circuit further includes: a third triode, a third triode
  • the input end of the third transistor is used to receive the compensation data signal
  • the output end of the third transistor is connected to the other end of the storage capacitor
  • the gate of the third transistor is used to receive the compensation scanning signal; when the red sub-pixel is lit, the current
  • the compensation data signal passing through the input end of the third transistor and the data signal passing through the input end of the second transistor jointly charge the storage capacitor, and the storage capacitor after the charge is discharged to make the red photo sub-pixel emit light.
  • the input end of the second triode is one of the source and drain of the second triode, and the output end of the second triode is the other of the source and drain of the second triode.
  • the input end of the third triode is one of the source and drain of the third triode, and the output end of the third triode is the other of the source and drain of the third triode.
  • the voltage value provided by the compensation data signal is smaller than the lighting voltage value of the red photo sub-pixel.
  • the pixel driving circuit further includes: a first scan line, the first scan line is connected to the gate of the second triode for providing scan signals; the first data line, the first data line is connected to the second triode The input terminal of the second scan line is used to provide data signals; the second scan line, the second scan line is connected to the gate of the third transistor, and is used to provide the compensation scan signal; the second data line, the second data line is connected to the third The input end of the triode is used to provide compensation data signals.
  • the driving time of the first scan line is the same as the driving time of the second scan line
  • the driving time of the first data line is the same as the driving time of the second data line
  • the difference between the first preset voltage and the second preset voltage is not less than the threshold voltage of the first triode.
  • At least one blue light emitting diode is a blue light emitting diode
  • at least one green light emitting diode is a green light emitting diode
  • at least two red light emitting diodes connected in series are two red light emitting diodes connected in series.
  • the pixel drive circuit provided by the present application includes a blue sub-pixel, a green sub-pixel, and a red sub-pixel connected in parallel, wherein the blue sub-pixel includes at least one blue light-emitting diode, The pixel includes at least one green light-emitting diode, and the red photo sub-pixel includes at least two red light-emitting diodes connected in series, and the number of red light-emitting diodes is greater than the number of blue light-emitting diodes and the number of green light-emitting diodes.
  • a single red light-emitting diode replaces a single light-emitting diode, which can reduce the driving current of the red photo sub-pixels under the condition of achieving the same brightness, thereby reducing the total current in the display panel and improving the uniformity of light emission of the display panel.
  • FIG. 1 is a schematic structural diagram of a pixel driving circuit provided by an embodiment of the present application.
  • FIG. 2 is another schematic structural diagram of a pixel driving circuit provided by an embodiment of the present application.
  • FIG. 3 is another schematic structural diagram of a pixel driving circuit provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of another structure of a pixel driving circuit provided by an embodiment of the present application.
  • FIG. 5 is a waveform diagram of the scan signal, data signal, compensation scan signal, and compensation data signal in FIG. 4 changing with the clock signal;
  • FIG. 6 is another schematic structural diagram of a pixel driving circuit provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a display device provided by an embodiment of the present application.
  • the technical solution adopted in this application is to provide a pixel driving circuit to reduce the driving current of the red sub-pixels under the condition of achieving the same brightness, thereby reducing the total current in the display panel to reduce the voltage. Attenuation to improve the uniformity of light emission of the display panel.
  • FIG. 1 is a schematic structural diagram of a pixel driving circuit provided by an embodiment of the present application.
  • the pixel driving circuit 100 includes a blue sub-pixel 101, a green sub-pixel 102, and a red sub-pixel 103 connected in parallel.
  • the blue sub-pixel 101 includes at least one blue light-emitting diode B
  • the green sub-pixel 102 includes at least One green light-emitting diode G
  • the red photo sub-pixel 103 includes at least two red light-emitting diodes R connected in series.
  • the number of red light-emitting diodes R is greater than the number of blue light-emitting diodes B and the number of green light-emitting diodes G, for example, the number of red light-emitting diodes R is 2, the number of blue light-emitting diodes B and the number of green light-emitting diodes
  • the number of G is 1.
  • the number of the three is 1, which can be used to achieve the same brightness.
  • the current drives the red light sub-pixel 103, thereby reducing the total current in the display panel, reducing voltage attenuation, and improving the uniformity of light emission of the display panel.
  • the red sub-pixel 103 may include two, three, or four red light-emitting diodes R connected in series, and the multiple red light-emitting diodes R connected in series are preferably products of the same specification or model, or, They have the same turn-on voltage to ensure the uniformity of light emission of the red sub-pixels 103.
  • the number of blue light-emitting diodes B and the number of green light-emitting diodes G may be equal or unequal. When the two are not equal, the numbers of the two are inversely proportional to their corresponding luminous efficiency.
  • the luminous efficiency of the diode B is lower than the luminous efficiency of the green light-emitting diode G, so the number of blue light-emitting diodes B is greater than the number of green light-emitting diodes G.
  • the blue sub-pixel 101 includes a plurality of blue light-emitting diodes B or the green sub-pixel 102 includes a plurality of green light-emitting diodes B
  • the plurality of blue light-emitting diodes B or green light-emitting diodes G are connected in series.
  • increasing the number of blue LEDs B and green LEDs G can further reduce the number of The total current is reduced, the voltage attenuation is reduced, and the light-emitting uniformity of the display panel is improved.
  • the pixel driving circuit 100 further includes a first triode T1, a second triode T2, and a storage capacitor C1.
  • the first end of the first triode T1 is connected to one end of the red photo sub-pixel 103, the second end of the first triode T1 is input with the first preset voltage V1, and the other end of the red photo sub-pixel 103 is input with the Two preset voltages V2, the gate G of the first triode is used to receive the data signal Data to control the red photo sub-pixel 103 to emit light.
  • the first end of the first triode T1 is one of the source S and the drain D of the first triode T1
  • the second end of the first triode T1 is the second end of the first triode T1.
  • the other of the source S and the drain D For example, as shown in FIG.
  • the first end of the first triode T1 is the drain D of the first triode T1
  • the second end of the first triode T1 is the source of the first triode T1.
  • S For another example, as shown in FIG. 3, the first end of the first triode T1 is the source S of the first triode T1, and the second end of the first triode T1 is the drain of the first triode T1. Extreme D.
  • One end of the storage capacitor C1 is connected to the gate G of the first triode T1, and the other end of the storage capacitor C1 is connected to the first end of the first triode T1 or the second end of the first triode T1.
  • the two connection modes of the storage capacitor C1 correspond to the high voltage or the low voltage of the second preset voltage V2. If the second preset voltage V2 is a high voltage, the first preset voltage V1 is a low voltage, and the storage capacitor C1 is connected to the second end of the first transistor T1.
  • the red photo sub-pixel The positive input of 103 has a high voltage of 20V
  • the negative electrode of the red photo sub-pixel 103 is connected to the drain D of the first transistor T1
  • the source S of the first transistor T1 has a low voltage of 0.5V
  • the storage capacitor C1 One end is connected to the gate G of the first transistor T1, and the other end is connected to the source S of the first transistor T1.
  • the second preset voltage V2 is a low voltage
  • the first preset voltage V1 is a high voltage
  • the storage capacitor C1 is connected to the first end of the first transistor T1
  • the red photon The negative electrode of the pixel 103 is input with a low voltage of 0.5V
  • the positive electrode of the red photo sub-pixel 103 is connected to the source S of the first transistor T1
  • the drain D of the first transistor T1 is input with a high voltage of 20V
  • the storage capacitor C1 One end of is connected to the gate G of the first triode T1, and the other end is connected to the source S of the first triode T1.
  • the gate G of the second transistor T2 is used to receive the scan signal Gate, the input end of the second transistor T2 is used to receive the data signal Data, and the output end of the second transistor T2 is connected to the storage capacitor C1 At one end, the data signal Data is transmitted to the gate G of the first transistor T1 via one end of the storage capacitor C1.
  • the input end of the second triode T2 is one of the source S and the drain D of the second triode T2, and the output end of the second triode T2 is the source of the second triode T2 The other of S and drain D.
  • the input terminal of the second transistor T2 is the drain D of the second transistor T2
  • the output terminal of the second transistor T2 is the source S of the second transistor T2.
  • the voltage VG on the gate G of the first transistor T1 is provided by the data signal Data received by the gate G of the first transistor T1, where the data
  • the signal Data is controlled by the driving IC, and the voltage value that the data signal Data can provide generally has an upper limit.
  • the driving current of the red photo sub-pixel 103 will decrease under the condition of reaching the same red light brightness, but the red photon The voltage drop of the pixel 103 will increase.
  • the second preset voltage V2 input on the negative electrode of the red photo sub-pixel 103 will not change, the voltage on the positive electrode of the red photo sub-pixel 103, that is, the first end (source S) of the first transistor T1 The voltage VS will increase. Further, since the VGS voltage (that is, the difference between VG and VS) of the first triode in the lighting state is constant, a higher VG is required.
  • V2 is a low voltage of 0.5V
  • the voltage drop when a single red light-emitting diode R is lit is 1.7V
  • the VGS voltage of the first triode T1 is 4V.
  • the red sub-pixel 103 includes a red light-emitting diode R
  • VS is 2.2V
  • the voltage VG that the data signal Data needs to provide is 6.2V
  • the red sub-pixel 103 includes two red light-emitting diodes R, when the red sub-pixel 103 is in the lit state, VS is 3.9V
  • the voltage VG that the data signal Data needs to provide is 7.9V.
  • the voltage drop of the red photo sub-pixel 103 increases from 2.2V to 3.9V, resulting in the voltage value of the data signal Data to be provided from 6.2V increased to 7.9V.
  • the voltage drop of the red photo sub-pixel 103 increases and the voltage VG required by the first triode T1 is greater than the maximum voltage that the data signal Data can provide, for example, when the voltage VG required by the first triode T1 is 7.9 V, and when the maximum voltage that the data signal Data can provide is 7.5V, the display will be abnormal.
  • the anode of the red photo sub-pixel 103 is connected to the first end (source S) of the first transistor T1, and the second end (drain D) of the first transistor T1 is input with a high voltage V1
  • the pixel driving circuit 100 may also include a third triode T3, so as to avoid the increase in the voltage drop of the red photo sub-pixel 103 which may cause the first triode T1 to require
  • the voltage VG is greater than the maximum voltage that the data signal Data can provide, which in turn causes the display abnormality problem.
  • the input terminal (drain D) of the third transistor T3 is used to receive the compensation data signal Data-S
  • the output terminal (source S) of the third transistor T3 is connected to the other end of the storage capacitor C1.
  • the gate G of the third transistor T3 is used to receive the compensation scan signal Gate-S.
  • the input terminal of the third transistor T3 is one of the source S and the drain D of the third transistor T3, and the output terminal of the third transistor T3 is the source S of the third transistor T3 And the other in drain D.
  • the input terminal of the third transistor T3 is the drain D of the third transistor T3, and the output terminal of the third transistor T3 is the source S of the third transistor T3.
  • the pixel driving circuit 100 may further include a first scan line Gateline, a first data line Dataline, a second scan line Gateline-S, and a second data line Dataline-S.
  • the first scan line Gateline is connected to the gate G of the second transistor T2, and is used to provide the foregoing scan signal Gate.
  • the first data line Dataline is connected to the input terminal of the second transistor T2, and is used to provide the aforementioned data signal Data.
  • the second scan line Gateline-S is connected to the gate G of the third transistor T3, and is used to provide the aforementioned compensated scan signal Gate-S.
  • the second data line Dataline-S is connected to the input terminal of the third transistor T3, and is used to provide the aforementioned compensation data signal Data-S.
  • the timing of the scan signal Gate may be the same as the timing of the compensation scan signal Gate-S
  • the timing of the data signal Data may be the same as the timing of the compensation data signal Data-S, that is, the first
  • the driving time of one scan line Gateline may be the same as the driving time of the second scan line Gateline-S
  • the driving time of the first data line Dataline may be the same as the driving time of the second data line Dataline-S.
  • the red photo sub-pixel 103 when the red photo sub-pixel 103 is turned on, first the first end (drain D) of the second transistor T2 receives the data signal Data, and at the same time the first end of the third transistor T3 Terminal (drain D) receives the compensation data signal Data-S, then the gate G of the second transistor T2 receives the scan signal Gate, and at the same time the gate G of the third transistor T3 receives the compensation scan signal Gate- S, then the data signal Data will be transmitted to one end of the storage capacitor C1 through the second end (source S) of the second transistor T2, and at the same time the compensation data signal Data-S will be transmitted through the second end of the third transistor T3 The end (source S) is transmitted to the other end of the storage capacitor C1, and then the data signal Data and the compensation data signal Data-S can simultaneously charge the storage capacitor C1, and due to the capacitive coupling effect of the storage capacitor C1, the storage capacitor C1 is After the charging is completed, the voltage VG on the gate G of the first transistor T1 will
  • the second preset voltage V2 is 0.5V
  • the voltage drop when a single red light-emitting diode R is lit is 1.7V
  • the VGS voltage of the first triode T1 is 4V
  • the red photo sub-pixel 103 includes two red light-emitting diodes R . If the voltage value provided by the compensated data signal Data-S is 1V, when the data signal Data and the compensated data signal Data-S simultaneously charge the storage capacitor C1, due to the capacitive coupling effect, the gate of the first transistor T1 The voltage VG on G will increase by 1V. Then, the charged storage capacitor C1 is discharged to make the red photo sub-pixel 103 emit light.
  • the voltage drop of the red photo sub-pixel 103 in the lit state is 3.4V, and the corresponding VS is 3.9V, and because the VGS voltage is 4V, so in order to ensure that the red photo sub-pixel 103 can normally emit light, the required voltage VG is 7.9V.
  • the voltage VG on the gate G of the first transistor T1 has risen by 1V due to the capacitive coupling effect of the storage capacitor C1 before the red photo sub-pixel 103 is lit, when the red photo sub-pixel is in the lit state, The voltage value required by the data signal Data is 6.9V (if there is no third transistor T3, the voltage value required by the data signal Data is 7.9V). In this way, by adding the third transistor T3, the voltage value required by the data signal Data can be reduced, thereby avoiding display abnormality due to the voltage VG required by the first transistor T1 being greater than the maximum voltage that the data signal Data can provide The problem.
  • the voltage value provided by the compensation data signal Data-S is smaller than the lighting voltage value of the red photo sub-pixel 103, that is, as shown in FIG. 4, during the process of charging the storage capacitor C1 by the compensation data signal Data-S,
  • the voltage value transmitted to the anode of the red photo sub-pixel 103 through the other end of the storage capacitor C1 is smaller than the lighting voltage value of the red photo sub-pixel 103, so as to prevent the red photo sub-pixel 103 from emitting abnormally.
  • the difference between the first preset voltage V1 and the second preset voltage V2 is not less than the threshold voltage of the first transistor T1 to ensure that the driving current can be generated to light up when the storage capacitor is discharged.
  • Red photo sub-pixel 103 the first triode T1, the second triode T2, and the third triode T3 may be specifically MOS transistors.
  • the blue sub-pixel 101 includes a plurality of blue light emitting diodes B connected in series, or the green sub-pixel 102 includes a plurality of green light emitting diodes G connected in series, the same method described above can also be used to solve the above problem.
  • the pixel driving circuit in this embodiment includes a blue sub-pixel, a green sub-pixel, and a red sub-pixel connected in parallel, wherein the blue sub-pixel includes at least one blue light-emitting diode, and the green sub-pixel includes at least one green sub-pixel.
  • the red sub-pixels include at least two red light-emitting diodes connected in series, and the number of red light-emitting diodes is greater than the number of blue light-emitting diodes and the number of green light-emitting diodes, so that it can be reduced under the condition of achieving the same brightness
  • the driving current of the red photo sub-pixels reduces the total current in the display panel and improves the uniformity of light emission of the display panel.
  • FIG. 7 is a schematic structural diagram of a display device provided by an embodiment of the present application.
  • the display device 70 includes the pixel driving circuit 71 of any of the above-mentioned embodiments.
  • the pixel drive circuit 71 includes a blue sub-pixel, a green sub-pixel, and a red sub-pixel connected in parallel.
  • the blue sub-pixel includes at least one blue light-emitting diode
  • the green sub-pixel includes at least one green light-emitting diode
  • the red sub-pixel includes at least two sequentially
  • the red light emitting diodes are connected in series, and the number of red light emitting diodes is greater than the number of blue light emitting diodes and the number of green light emitting diodes.
  • the display device in this embodiment includes a blue sub-pixel, a green sub-pixel, and a red sub-pixel connected in parallel, wherein the blue sub-pixel includes at least one blue light-emitting diode, and the green sub-pixel includes at least one green light-emitting diode.
  • the red sub-pixel includes at least two red light-emitting diodes connected in series, and the number of red light-emitting diodes is greater than the number of blue light-emitting diodes and the number of green light-emitting diodes. In this way, the red light can be reduced under the condition of achieving the same brightness.
  • the driving current of the photon pixels further reduces the total current in the display panel and improves the uniformity of light emission of the display panel.

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Abstract

一种像素驱动电路（71、100）和显示装置（70），像素驱动电路（71、100）包括：并联的蓝光子像素（101）、绿光子像素（102）和红光子像素（103），其中，蓝光子像素（101）包括至少一个蓝色发光二极管（B），绿光子像素（102）包括至少一个绿色发光二极管（G），红光子像素（103）包括至少两个依次串联的红色发光二极管（R），红色发光二极管（R）的数量大于蓝色发光二极管（B）的数量和绿色发光二极管（G）的数量。

Description

一种像素驱动电路和显示装置 技术领域
本申请涉及显示技术领域，具体涉及一种像素驱动电路和显示装置。
 背景技术
与液晶显示面板的电压驱动方式不同，微发光二极体（MicroLED）面板为电压转电流驱动方式，即输入端提供电压信号，经过像素电路转换为流经LED的电流，即可通过改变输入电压信号而改变流经每个像素内LED的电流值，进而达到控制面板亮度与灰阶的目的。
但是，由于红绿蓝三色micro LED的发光效率相差较大，特别是红色LED的发光效率明显偏低，在达到标准白色点时，通常流过红色LED的电流比流过蓝色LED和绿色LED的电流高出4~5倍，也即，在显示白色或红色画面时，整个面板流过的电流更大，电压信号输入端的电压到达远端像素时的电压衰减更加明显，进而导致面板亮度均一性变差。
 技术问题
本申请提供了一种像素驱动电路和显示装置，以在达到同等亮度的条件下减小红光子像素的驱动电流，进而降低显示面板内的总电流，以减小电压衰减，提高显示面板的发光均一性。
 技术解决方案
为了解决上述问题，本申请实施例提供了一种像素驱动电路，该像素驱动电路包括：并联的蓝光子像素、绿光子像素和红光子像素，其中，蓝光子像素包括至少一个蓝色发光二极管，绿光子像素包括至少一个绿色发光二极管，红光子像素包括至少两个依次串联的红色发光二极管，红色发光二极管的数量大于蓝色发光二极管的数量和绿色发光二极管的数量。
其中，像素驱动电路还包括：第一三极管，第一三极管的第一端连接于红光子像素的一端，第一三极管的第二端输入有第一预设电压，红光子像素的另一端输入有第二预设电压，第一三极管的栅极用于接收数据信号以控制红光子像素发光；存储电容，存储电容的一端连接于第一三极管的栅极，存储电容的另一端连接于第一三极管的第一端或第一三极管的第二端；第二三极管，第二三极管的栅极用于接收扫描信号，第二三极管的输入端用于接收数据信号，第二三极管的输出端连接于存储电容的一端，数据信号经由存储电容的一端传送至第一三极管的栅极。
其中，第一端为第一三极管的源极与漏极中的一个，第二端为第一三极管的源极与漏极中的另一个。
其中，当存储电容的另一端连接于第一三极管的第一端时，第一预设电压大于第二预设电压，像素驱动电路还包括：第三三极管，第三三极管的输入端用于接收补偿数据信号，第三三极管的输出端连接于存储电容的另一端，第三三极管的栅极用于接收补偿扫描信号；在点亮红光子像素时，流经第三三极管的输入端的补偿数据信号与流经第二三极管的输入端的数据信号共同对存储电容进行充电，且充电完成后的存储电容放电以使红光子像素发光。
其中，第二三极管的输入端为第二三极管的源极与漏极中的一个，第二三极管的输出端为第二三极管的源极与漏极中的另一个；第三三极管的输入端为第三三极管的源极与漏极中的一个，第三三极管的输出端为第三三极管的源极与漏极中的另一个。
其中，补偿数据信号提供的电压值小于红光子像素的点亮电压值。
其中，像素驱动电路还包括：第一扫描线，第一扫描线连接于第二三极管的栅极，用于提供扫描信号；第一数据线，第一数据线连接于第二三极管的输入端，用于提供数据信号；第二扫描线，第二扫描线连接于第三三极管的栅极，用于提供补偿扫描信号；第二数据线，第二数据线连接于第三三极管的输入端，用于提供补偿数据信号。
其中，第一扫描线的驱动时间与第二扫描线的驱动时间相同，第一数据线的驱动时间与第二数据线的驱动时间相同。
其中，第一预设电压与第二预设电压之间的差值不小于第一三极管的阈值电压。
其中，至少一个蓝色发光二极管为一个蓝色发光二极管，至少一个绿色发光二极管为一个绿色发光二极管，至少两个依次串联的红色发光二极管为两个依次串联的红色发光二极管。
为了解决上述问题，本申请实施例还提供了一种显示装置，该显示装置包括像素驱动电路，像素驱动电路包括：并联的蓝光子像素、绿光子像素和红光子像素，其中，蓝光子像素包括至少一个蓝色发光二极管，绿光子像素包括至少一个绿色发光二极管，红光子像素包括至少两个依次串联的红色发光二极管，红色发光二极管的数量大于蓝色发光二极管的数量和绿色发光二极管的数量。
其中，像素驱动电路还包括：第一三极管，第一三极管的第一端连接于红光子像素的一端，第一三极管的第二端输入有第一预设电压，红光子像素的另一端输入有第二预设电压，第一三极管的栅极用于接收数据信号以控制红光子像素发光；存储电容，存储电容的一端连接于第一三极管的栅极，存储电容的另一端连接于第一三极管的第一端或第一三极管的第二端；第二三极管，第二三极管的栅极用于接收扫描信号，第二三极管的输入端用于接收数据信号，第二三极管的输出端连接于存储电容的一端，数据信号经由存储电容的一端传送至第一三极管的栅极。
其中，第一端为第一三极管的源极与漏极中的一个，第二端为第一三极管的源极与漏极中的另一个。
其中，当存储电容的另一端连接于第一三极管的第一端时，第一预设电压大于第二预设电压，像素驱动电路还包括：第三三极管，第三三极管的输入端用于接收补偿数据信号，第三三极管的输出端连接于存储电容的另一端，第三三极管的栅极用于接收补偿扫描信号；在点亮红光子像素时，流经第三三极管的输入端的补偿数据信号与流经第二三极管的输入端的数据信号共同对存储电容进行充电，且充电完成后的存储电容放电以使红光子像素发光。
其中，第二三极管的输入端为第二三极管的源极与漏极中的一个，第二三极管的输出端为第二三极管的源极与漏极中的另一个；第三三极管的输入端为第三三极管的源极与漏极中的一个，第三三极管的输出端为第三三极管的源极与漏极中的另一个。
其中，补偿数据信号提供的电压值小于红光子像素的点亮电压值。
其中，像素驱动电路还包括：第一扫描线，第一扫描线连接于第二三极管的栅极，用于提供扫描信号；第一数据线，第一数据线连接于第二三极管的输入端，用于提供数据信号；第二扫描线，第二扫描线连接于第三三极管的栅极，用于提供补偿扫描信号；第二数据线，第二数据线连接于第三三极管的输入端，用于提供补偿数据信号。
其中，第一扫描线的驱动时间与第二扫描线的驱动时间相同，第一数据线的驱动时间与第二数据线的驱动时间相同。
其中，第一预设电压与第二预设电压之间的差值不小于第一三极管的阈值电压。
其中，至少一个蓝色发光二极管为一个蓝色发光二极管，至少一个绿色发光二极管为一个绿色发光二极管，至少两个依次串联的红色发光二极管为两个依次串联的红色发光二极管。
 有益效果
本申请的有益效果是：区别于现有技术，本申请提供的像素驱动电路包括并联的蓝光子像素、绿光子像素和红光子像素，其中，蓝光子像素包括至少一个蓝色发光二极管，绿光子像素包括至少一个绿色发光二极管，红光子像素包括至少两个依次串联的红色发光二极管，且红色发光二极管的数量大于蓝色发光二极管的数量和绿色发光二极管的数量，如此，通过采用依次串联的多个红色发光二极管替代单个发光二极管，在达到同等亮度的条件下能够减小红光子像素的驱动电流，进而降低显示面板内的总电流，提高显示面板的发光均一性。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请实施例提供的像素驱动电路的结构示意图；
图2是本申请实施例提供的像素驱动电路的另一结构示意图；
图3是本申请实施例提供的像素驱动电路的另一结构示意图；
图4是本申请实施例提供的像素驱动电路的另一结构示意图；
图5是图4中扫描信号、数据信号、补偿扫描信号和补偿数据信号随时钟信号变化的波形图；
图6是本申请实施例提供的像素驱动电路的另一结构示意图；
图7是本申请实施例提供的显示装置的结构示意图。
 本发明的实施方式
下面结合附图和实施例，对本申请作进一步地详细描述。特别指出的是，以下实施例仅用于说明本申请，但不对本申请的范围进行限定。同样的，以下实施例仅为本申请的部分实施例而非全部实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例，都属于本申请保护的范围。
由于红绿蓝三色micro LED的发光效率相差较大，特别是红色LED的发光效率明显偏低，在达到标准白色点时，通常流过红色LED的电流比流过蓝色LED和绿色LED的电流高出4~5倍，也即，在显示白色或红色画面时，整个面板流过的电流更大，电压信号输入端的电压到达远端像素时的电压衰减更加明显，进而导致面板亮度均一性变差。为了解决上述技术问题，本申请采用的技术方案是提供一种像素驱动电路，以在达到同等亮度的条件下减小红光子像素的驱动电流，进而降低显示面板内的总电流，以减小电压衰减，提高显示面板的发光均一性。
请参阅图1，图1是本申请实施例提供的像素驱动电路的结构示意图。如图1所示，该像素驱动电路100包括并联的蓝光子像素101、绿光子像素102和红光子像素103，其中，蓝光子像素101包括至少一个蓝色发光二极管B，绿光子像素102包括至少一个绿色发光二极管G，红光子像素103包括至少两个依次串联的红色发光二极管R。
在本实施例中，红色发光二极管R的数量大于蓝色发光二极管B的数量和绿色发光二极管G的数量，例如，红色发光二极管R的数量为2，蓝色发光二极管B的数量和绿色发光二极管G的数量均为1。相比于红色发光二极管R的数量与蓝色发光二极管B的数量和绿色发光二极管G的数量相等的情况，例如，三者的数量均为1，在达到同等亮度的条件下能够采用更小的电流驱动上述红光子像素103，进而能够降低显示面板内的总电流，减小电压衰减，提高显示面板的发光均一性。
在本实施例中，红色子像素103可以包括依次串联的两个、三个或四个红色发光二极管R，且该依次串联的多个红色发光二极管R优选为同一规格或型号的产品，或者，具有相同的导通电压，以确保红光子像素103的发光均一性。
具体地，上述蓝色发光二极管B的数量和绿色发光二极管G的数量可以相等也可以不相等，当二者不相等时，二者的数量与其对应的发光效率成反比，例如，若蓝色发光二级管B的发光效率低于绿色发光二级管G的发光效率，则蓝色发光二极管B的数量大于绿色发光二极管G的数量。并且，当蓝光子像素101包括多个蓝色发光二极管B或绿光子像素102包括多个绿色发光二极管B时，该多个蓝色发光二极管B或绿色发光二极管G依次串联。另外，在红色发光二极管R的数量大于蓝色发光二极管B的数量和绿色发光二极管G的数量的前提下，适量增加蓝色发光二极管B和绿色发光二极管G的数量，能够进一步地降低显示面板内的总电流，减小电压衰减，以及提高显示面板的发光均一性。
在一个实施例中，请参阅图2和图3，像素驱动电路100还包括第一三极管T1、第二三极管T2和存储电容C1。
其中，第一三极管T1的第一端连接于红光子像素103的一端，第一三极管T1的第二端输入有第一预设电压V1，红光子像素103的另一端输入有第二预设电压V2，第一三极管的栅极G用于接收数据信号Data以控制红光子像素103发光。具体地，第一三极管T1的第一端为第一三极管T1的源极S与漏极D中的一个，第一三极管T1的第二端为第一三极管T1的源极S与漏极D中的另一个。例如，如图2所示，第一三极管T1的第一端为第一三极管T1的漏极D，第一三极管T1的第二端为第一三极管T1的源极S。又例如，如图3所示，第一三极管T1的第一端为第一三极管T1的源极S，第一三极管T1的第二端为第一三极管T1的漏极D。
其中，存储电容C1的一端连接于第一三极管T1的栅极G，存储电容C1的另一端连接于第一三极管T1的第一端或第一三极管T1的第二端。
具体地，存储电容C1的两种连接方式对应上述第二预设电压V2为高电压或低电压。若第二预设电压V2为高电压，则第一预设电压V1为低电压，且存储电容C1连接于第一三极管T1的第二端，例如，如图2所示，红光子像素103的正极输入有高电压20V，红光子像素103的负极连接于第一三极管T1的漏极D，第一三极管T1的源极S输入有低电压0.5V，且存储电容C1的一端连接于第一三极管T1的栅极G，另一端连接于第一三极管T1的源极S。若第二预设电压V2为低电压，则第一预设电压V1为高电压时，且存储电容C1连接于第一三极管T1的第一端，例如，如图3所示，红光子像素103的负极输入有低电压0.5V，红光子像素103的正极连接于第一三极管T1的源极S，第一三极管T1的漏极D输入有高电压20V，且存储电容C1的一端连接于第一三极管T1的栅极G，另一端连接于第一三极管T1的源极S。
其中，第二三极管T2的栅极G用于接收扫描信号Gate，第二三极管T2的输入端用于接收数据信号Data，第二三极管T2的输出端连接于存储电容C1的一端，数据信号Data经由存储电容C1的一端传送至第一三极管T1的栅极G。具体地，第二三极管T2的输入端为第二三极管T2的源极S与漏极D中的一个，第二三极管T2的输出端为第二三极管T2的源极S与漏极D中的另一个。例如，如图2所示，第二三极管T2的输入端为第二三极管T2的漏极D，第二三极管T2的输出端为第二三极管T2的源极S。
继续参阅图3，在点亮红光子像素103时，第一三极管T1的栅极G上的电压VG由第一三极管T1的栅极G接收到的数据信号Data提供，其中，数据信号Data由驱动IC控制，且数据信号Data所能提供的电压值一般具有上限值。在红光子像素103处于点亮状态时，由于红光子像素103中红色发光二极管R的数量增加了，在达到同等红光亮度的条件下，红光子像素103的驱动电流会减小，但红光子像素103的压降会增大。又因为红光子像素103的负极上输入的第二预设电压V2不会改变，所以红光子像素103的正极上的电压，也即第一三极管T1的第一端（源极S）上的电压VS会增大。进一步地，由于在点亮状态下第一三级管的VGS电压（也即VG与VS之差）是一定的，因此需要使用更高的VG。
例如，V2为低电压0.5V，单个红色发光二极管R点亮时的压降为1.7V,第一三级管T1的VGS电压为4V。若红光子像素103包括一个红色发光二极管R，则当红光子像素103处于点亮状态时，VS为2.2V，数据信号Data需提供的电压VG为6.2V。若红光子像素103包括两个红色发光二极管R，则当红光子像素103处于点亮状态时，VS为3.9V，数据信号Data需提供的电压VG为7.9V。也即，当红光子像素103中红色发光二极管R的数量有1个增加至2个时，由于红光子像素103的压降由2.2V增大至3.9V，导致数据信号Data需提供的电压值由6.2V增大至7.9V。如此，当红光子像素103的压降增大而导致第一三极管T1需要的电压VG大于数据信号Data所能提供的最大电压时，例如，当第一三极管T1需要的电压VG为7.9V，而数据信号Data所能提供的最大电压为7.5V时，会出现显示异常的问题。
在一个具体实施例中，请参阅图4，当上述存储电容C1的另一端B连接于第一三极管T1的第一端（源极S）时，也即第一预设电压V1大于第二预设电压V2，红光子像素103的正极连接于第一三极管T1的第一端（源极S），第一三极管T1的第二端（漏极D）输入有高电压V1，红光子像素103的负极输入有低电压V2时，像素驱动电路100还可以包括第三三极管T3，以避免由于红光子像素103的压降增大而导致第一三极管T1需要的电压VG大于数据信号Data所能提供的最大电压，进而导致显示异常的问题。
具体地，第三三极管T3的输入端（漏极D）用于接收补偿数据信号Data-S，第三三极管T3的输出端（源极S）连接于上述存储电容C1的另一端，第三三极管T3的栅极G用于接收补偿扫描信号Gate-S。在点亮红光子像素103时，流经第三三极管T3的输入端（漏极D）的补偿数据信号Data-S与流经第二三极管T2的输入端（漏极D）的数据信号Data共同对存储电容C1进行充电，且充电完成后的存储电容C1放电以使红光子像素103发光。
其中，第三三极管T3的输入端为第三三极管T3的源极S与漏极D中的一个，第三三极管T3的输出端为第三三极管T3的源极S与漏极D中的另一个。例如，如图4所示，第三三极管T3的输入端为第三三极管T3的漏极D，第三三极管T3的输出端为第三三极管T3的源极S。
在一些实施例中，如图6所示，像素驱动电路100还可以包括第一扫描线Gateline、第一数据线Dataline、第二扫描线Gateline-S和第二数据线Dataline-S。其中，第一扫描线Gateline连接于第二三极管T2的栅极G，用于提供上述扫描信号Gate。第一数据线Dataline连接于第二三极管T2的输入端，用于提供上述数据信号Data。第二扫描线Gateline-S连接于第三三极管T3的栅极G，用于提供上述补偿扫描信号Gate-S。第二数据线Dataline-S连接于第三三极管T3的输入端，用于提供上述补偿数据信号Data-S。
其中，如图5所示，上述扫描信号Gate的时序可以与上述补偿扫描信号Gate-S的时序相同，上述数据信号Data的时序可以与上述补偿数据信号Data-S的时序相同，也即，第一扫描线Gateline的驱动时间可以与第二扫描线Gateline-S的驱动时间相同，第一数据线Dataline的驱动时间可以与第二数据线Dataline-S的驱动时间相同。
具体地，继续参阅图4，在点亮红光子像素103时，首先第二三极管T2的第一端（漏极D）接收到数据信号Data，且同时第三三极管T3的第一端（漏极D）接收到的补偿数据信号Data-S，然后第二三极管T2的栅极G接收扫描信号Gate，且同时第三三极管T3的栅极G接收补偿扫描信号Gate-S，接着数据信号Data会经第二三极管T2的第二端（源极S）传输至存储电容C1的一端，且同时补偿数据信号Data-S会经第三三极管T3的第二端（源极S）传输至存储电容C1的另一端，然后数据信号Data和补偿数据信号Data-S能够同时对存储电容C1进行充电，且由于存储电容C1的电容耦合效应，在对存储电容C1充电完成后，第一三极管T1的栅极G上的电压VG会升高。如此，能够降低数据信号Data所需提供的电压值。
例如，第二预设电压V2为0.5V，单个红色发光二极管R点亮时的压降为1.7V,第一三级管T1的VGS电压为4V，红光子像素103包括两个红色发光二极管R，若补偿数据信号Data-S提供的电压值为1V,则在数据信号Data和补偿数据信号Data-S同时对存储电容C1进行充电时，由于电容耦合效应，第一三极管T1的栅极G上的电压VG会升高1V。接着，充电完成后的存储电容C1放电以使红光子像素103发光，由上可知，红光子像素103在点亮状态下的压降为3.4V，对应的VS为3.9V，又因为VGS电压为4V，所以为了保证红光子像素103能够正常发光需要的电压VG为7.9V。又因为在红光子像素103点亮前，由于存储电容C1的电容耦合效应，第一三极管T1的栅极G上的电压VG已升高1V，所以在红光子像素处于点亮状态时，数据信号Data所需提供的电压值为6.9V（若无第三三极管T3，则数据信号Data所需提供的电压值为7.9V）。如此，通过增加第三三极管T3，能够降低数据信号Data所需提供的电压值,进而避免由于第一三极管T1需要的电压VG大于数据信号Data所能提供的最大电压而导致显示异常的问题。
具体地，补偿数据信号Data-S提供的电压值小于红光子像素103的点亮电压值，也即，如图4所示，在补偿数据信号Data-S对存储电容C1进行充电的过程中，经上述存储电容C1的另一端传输至红光子像素103的正极上的电压值小于红光子像素103的点亮电压值，以避免红光子像素103不正常发光。
在上述实施例中，第一预设电压V1与第二预设电压V2之间的差值不小于第一三极管T1的阈值电压，以保证在存储电容放电时能够产生驱动电流以点亮红光子像素103。另外，上述第一三极管T1、第二三极管T2和第三三极管T3可以具体为MOS管。
值得注意的是，当蓝光子像素101包括依次串联的多个蓝色发光二极管B，或者绿光子像素102包括依次串联的多个绿色发光二极管G时，也可以采用上述同样的方法解决上述问题。
区别于现有技术，本实施例中的像素驱动电路，包括并联的蓝光子像素、绿光子像素和红光子像素，其中，蓝光子像素包括至少一个蓝色发光二极管，绿光子像素包括至少一个绿色发光二极管，红光子像素包括至少两个依次串联的红色发光二极管，且红色发光二极管的数量大于蓝色发光二极管的数量和绿色发光二极管的数量，如此，以在达到同等亮度的条件下能够减小红光子像素的驱动电流，进而降低显示面板内的总电流，提高显示面板的发光均一性。
请参阅图7，图7是本申请实施例提供的显示装置的结构示意图。如图7所示，该显示装置70包括上述任一实施例的像素驱动电路71。其中，像素驱动电路71包括并联的蓝光子像素、绿光子像素和红光子像素，蓝光子像素包括至少一个蓝色发光二极管，绿光子像素包括至少一个绿色发光二极管，红光子像素包括至少两个依次串联的红色发光二极管，且红色发光二极管的数量大于蓝色发光二极管的数量和绿色发光二极管的数量。
区别于现有技术，本实施例中的显示装置，包括并联的蓝光子像素、绿光子像素和红光子像素，其中，蓝光子像素包括至少一个蓝色发光二极管，绿光子像素包括至少一个绿色发光二极管，红光子像素包括至少两个依次串联的红色发光二极管，且红色发光二极管的数量大于蓝色发光二极管的数量和绿色发光二极管的数量，如此，以在达到同等亮度的条件下能够减小红光子像素的驱动电流，进而降低显示面板内的总电流，提高显示面板的发光均一性。
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本申请的保护范围之内。

Claims (20)

  1. 一种像素驱动电路，其包括：并联的蓝光子像素、绿光子像素和红光子像素，
    其中，所述蓝光子像素包括至少一个蓝色发光二极管，所述绿光子像素包括至少一个绿色发光二极管，所述红光子像素包括至少两个依次串联的红色发光二极管，所述红色发光二极管的数量大于所述蓝色发光二极管的数量和所述绿色发光二极管的数量。
  2. 根据权利要求1所述的像素驱动电路，其中，所述像素驱动电路还包括：
    第一三极管，所述第一三极管的第一端连接于所述红光子像素的一端，所述第一三极管的第二端输入有第一预设电压，所述红光子像素的另一端输入有第二预设电压，所述第一三极管的栅极用于接收数据信号以控制所述红光子像素发光；
    存储电容，所述存储电容的一端连接于所述第一三极管的栅极，所述存储电容的另一端连接于所述第一三极管的第一端或所述第一三极管的第二端；
    第二三极管，所述第二三极管的栅极用于接收所述扫描信号，所述第二三极管的输入端用于接收所述数据信号，所述第二三极管的输出端连接于所述存储电容的一端，所述数据信号经由所述存储电容的一端传送至所述第一三极管的栅极。
  3. 根据权利要求2所述的像素驱动电路，其中，所述第一端为所述第一三极管的源极与漏极中的一个，所述第二端为所述第一三极管的源极与漏极中的另一个。
  4. 根据权利要求2所述的像素驱动电路，其中，当所述存储电容的另一端连接于所述第一三极管的第一端时，所述第一预设电压大于所述第二预设电压，所述像素驱动电路还包括：
    第三三极管，所述第三三极管的输入端用于接收补偿数据信号，所述第三三极管的输出端连接于所述存储电容的另一端，所述第三三极管的栅极用于接收补偿扫描信号；
    在点亮所述红光子像素时，流经所述第三三极管的输入端的补偿数据信号与流经所述第二三极管的输入端的数据信号共同对所述存储电容进行充电，且充电完成后的所述存储电容放电以使所述红光子像素发光。
  5. 根据权利要求4所述的像素驱动电路，其中，所述第二三极管的输入端为所述第二三极管的源极与漏极中的一个，所述第二三极管的输出端为所述第二三极管的源极与漏极中的另一个；所述第三三极管的输入端为所述第三三极管的源极与漏极中的一个，所述第三三极管的输出端为所述第三三极管的源极与漏极中的另一个。
  6. 根据权利要求4所述的像素驱动电路，其中，所述补偿数据信号提供的电压值小于所述红光子像素的点亮电压值。
  7. 根据权利要求4所述的像素驱动电路，其中，所述像素驱动电路还包括：
    第一扫描线，所述第一扫描线连接于所述第二三极管的栅极，用于提供所述扫描信号；
    第一数据线，所述第一数据线连接于所述第二三极管的输入端，用于提供所述数据信号；
    第二扫描线，所述第二扫描线连接于所述第三三极管的栅极，用于提供所述补偿扫描信号；
    第二数据线，所述第二数据线连接于所述第三三极管的输入端，用于提供所述补偿数据信号。
  8. 根据权利要求7所述的像素驱动电路，其中，所述第一扫描线的驱动时间与所述第二扫描线的驱动时间相同，所述第一数据线的驱动时间与所述第二数据线的驱动时间相同。
  9. 根据权利要求1所述的像素驱动电路，其中，所述第一预设电压与所述第二预设电压之间的差值不小于所述第一三极管的阈值电压。
  10. 根据权利要求1所述的像素驱动电路，其中，所述至少一个蓝色发光二极管为一个蓝色发光二极管，所述至少一个绿色发光二极管为一个绿色发光二极管，所述至少两个依次串联的红色发光二极管为两个依次串联的红色发光二极管。
  11. 一种显示装置，其包括像素驱动电路，所述像素驱动电路包括：
    并联的蓝光子像素、绿光子像素和红光子像素，
    其中，所述蓝光子像素包括至少一个蓝色发光二极管，所述绿光子像素包括至少一个绿色发光二极管，所述红光子像素包括至少两个依次串联的红色发光二极管，所述红色发光二极管的数量大于所述蓝色发光二极管的数量和所述绿色发光二极管的数量。
  12. 根据权利要求11所述的显示装置，其中，所述像素驱动电路还包括：
    第一三极管，所述第一三极管的第一端连接于所述红光子像素的一端，所述第一三极管的第二端输入有第一预设电压，所述红光子像素的另一端输入有第二预设电压，所述第一三极管的栅极用于接收数据信号以控制所述红光子像素发光；
    存储电容，所述存储电容的一端连接于所述第一三极管的栅极，所述存储电容的另一端连接于所述第一三极管的第一端或所述第一三极管的第二端；
    第二三极管，所述第二三极管的栅极用于接收所述扫描信号，所述第二三极管的输入端用于接收所述数据信号，所述第二三极管的输出端连接于所述存储电容的一端，所述数据信号经由所述存储电容的一端传送至所述第一三极管的栅极。
  13. 根据权利要求12所述的显示装置，其中，所述第一端为所述第一三极管的源极与漏极中的一个，所述第二端为所述第一三极管的源极与漏极中的另一个。
  14. 根据权利要求12所述的显示装置，其中，当所述存储电容的另一端连接于所述第一三极管的第一端时，所述第一预设电压大于所述第二预设电压，所述像素驱动电路还包括：
    第三三极管，所述第三三极管的输入端用于接收补偿数据信号，所述第三三极管的输出端连接于所述存储电容的另一端，所述第三三极管的栅极用于接收补偿扫描信号；
    在点亮所述红光子像素时，流经所述第三三极管的输入端的补偿数据信号与流经所述第二三极管的输入端的数据信号共同对所述存储电容进行充电，且充电完成后的所述存储电容放电以使所述红光子像素发光。
  15. 根据权利要求14所述的显示装置，其中，所述第二三极管的输入端为所述第二三极管的源极与漏极中的一个，所述第二三极管的输出端为所述第二三极管的源极与漏极中的另一个；所述第三三极管的输入端为所述第三三极管的源极与漏极中的一个，所述第三三极管的输出端为所述第三三极管的源极与漏极中的另一个。
  16. 根据权利要求14所述的显示装置，其中，所述补偿数据信号提供的电压值小于所述红光子像素的点亮电压值。
  17. 根据权利要求14所述的显示装置，其中，所述像素驱动电路还包括：
    第一扫描线，所述第一扫描线连接于所述第二三极管的栅极，用于提供所述扫描信号；
    第一数据线，所述第一数据线连接于所述第二三极管的输入端，用于提供所述数据信号；
    第二扫描线，所述第二扫描线连接于所述第三三极管的栅极，用于提供所述补偿扫描信号；
    第二数据线，所述第二数据线连接于所述第三三极管的输入端，用于提供所述补偿数据信号。
  18. 根据权利要求17所述的显示装置，其中，所述第一扫描线的驱动时间与所述第二扫描线的驱动时间相同，所述第一数据线的驱动时间与所述第二数据线的驱动时间相同。
  19. 根据权利要求11所述的显示装置，其中，所述第一预设电压与所述第二预设电压之间的差值不小于所述第一三极管的阈值电压。
  20. 根据权利要求11所述的显示装置，其中，所述至少一个蓝色发光二极管为一个蓝色发光二极管，所述至少一个绿色发光二极管为一个绿色发光二极管，所述至少两个依次串联的红色发光二极管为两个依次串联的红色发光二极管。
PCT/CN2019/087727 2019-04-22 2019-05-21 一种像素驱动电路和显示装置 Ceased WO2020215418A1 (zh)

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