WO2022116306A1 - Pixel circuit and display panel - Google Patents

Pixel circuit and display panel Download PDF

Info

Publication number
WO2022116306A1
WO2022116306A1 PCT/CN2020/138013 CN2020138013W WO2022116306A1 WO 2022116306 A1 WO2022116306 A1 WO 2022116306A1 CN 2020138013 W CN2020138013 W CN 2020138013W WO 2022116306 A1 WO2022116306 A1 WO 2022116306A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
light
emitting device
resistor
display panel
Prior art date
Application number
PCT/CN2020/138013
Other languages
French (fr)
Chinese (zh)
Inventor
张留旗
Original Assignee
深圳市华星光电半导体显示技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市华星光电半导体显示技术有限公司 filed Critical 深圳市华星光电半导体显示技术有限公司
Publication of WO2022116306A1 publication Critical patent/WO2022116306A1/en

Links

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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • 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

  • the present application relates to the field of display technology, in particular to the field of pixel driving technology, and in particular to a pixel circuit and a display panel.
  • OLED Organic light emitting diode
  • AMOLED matrix organic light emitting diode
  • the present application provides a pixel circuit and a display panel, which solve the problem of reduced luminous efficiency caused by uneven luminescence of the pixel circuit and device aging.
  • the present application provides a pixel circuit, which includes a drive circuit and an external compensation circuit; the drive circuit at least has a light-emitting device and a data line for transmitting a first data signal; the external compensation circuit is connected to the drive circuit, and responds to the The luminous intensity of the light-emitting device is used to obtain the corresponding real-time sensing value, and the difference between the real-time sensing value and the preset sensing value is accumulated to the first data signal to obtain the second data signal, and the second data signal is output to the data. Wire.
  • the external compensation circuit includes a sensing unit; the first input end of the sensing unit is connected to the first power line in the driving circuit, and the second The input end is connected to the second power line in the driving circuit, and is used for acquiring a corresponding real-time voltage sensing value according to the luminous intensity of the light-emitting device.
  • the sensing unit includes a photosensitive device and a resistor; the input end of the photosensitive device is connected to the first power line, and the output end of the photosensitive device is connected to the first power line.
  • the first end of the resistor is connected, and the second end of the resistor is connected to the second power line; wherein, the first power line is used for connecting the first power signal, the second power line is used for connecting the second power signal, and the first power line is used for connecting the first power signal.
  • the potential of the power supply signal is higher than that of the second power supply signal.
  • the photosensitive device is a phototransistor; the first power line is connected to the collector of the phototransistor, and the emitter of the phototransistor is connected to the third electrode of the resistor. One end is connected, and the gate of the phototransistor is used to detect the luminous intensity of the light-emitting device.
  • the photosensitive device is a photodiode; the first power line is connected to the anode of the photodiode, and the cathode of the photodiode is connected to the first end of the resistor connected, the photodiode is used to detect the luminous intensity of the light-emitting device.
  • the photosensitive device is a photoresistor; the first power line is connected to the first end of the photoresistor, and the second end of the photoresistor is connected to the resistor The first end is connected, and the photoresistor is used to detect the luminous intensity of the light-emitting device.
  • the external compensation circuit further includes an analog-to-digital conversion unit; the input end of the analog-to-digital conversion unit is connected to the first end of the resistor for Analog-to-digital conversion of real-time voltage sensed values.
  • the external compensation circuit further includes a control unit; the control unit is connected to the output end of the analog-to-digital conversion unit, and is used to calculate the real-time sensing value and accumulating the difference from the preset sensing value to the first data signal to obtain the second data signal.
  • the external compensation circuit further includes a digital-to-analog conversion unit; the input end of the digital-to-analog conversion unit is connected to the control unit, and the The output end is connected to the data line and is used for digital-to-analog conversion of the second data signal.
  • the present application provides a display panel including the pixel circuit in any one of the above embodiments.
  • a corresponding real-time sensing value is obtained based on the luminous intensity of the light-emitting device through an external compensation circuit, and the difference between the real-time sensing value and the preset sensing value is accumulated to the first data signal to obtain a corresponding real-time sensing value.
  • Obtaining the second data signal and outputting the second data signal to the data line can compensate the data signal connected by the driving circuit in real time, and realize the uniformity of the light emission of the pixel circuit. Real-time compensation, therefore, in the process of compensation, the problem of low luminous efficiency caused by device aging is also compensated.
  • FIG. 1 is a schematic diagram of a first structure of a pixel circuit provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a second structure of a pixel circuit according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a third structure of a pixel circuit according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a fourth structure of a pixel circuit provided by an embodiment of the present application.
  • FIG. 5 is a schematic timing diagram of a pixel circuit according to an embodiment of the present application.
  • this embodiment provides a pixel circuit, which includes a driving circuit 100 and an external compensation circuit 200 ; the driving circuit 100 at least has a light-emitting device D1 and a data line DL for transmitting a first data signal ;
  • the external compensation circuit 200 is connected to the drive circuit 100, obtains the corresponding real-time sensing value in response to the luminous intensity of the light-emitting device D1, and accumulates the difference between the real-time sensing value and the preset sensing value to the first data signal to obtain outputting the second data signal, and outputting the second data signal to the data line DL.
  • the sum of the potential of the first data signal and the difference is the potential of the second data signal.
  • the real-time sensing value is obtained according to the luminous intensity of the light-emitting device D1
  • it is different from the real-time sensing value obtained by directly inducing voltage or current in the pixel circuit in the traditional technical solution, because the luminous The intensity comprehensively considers factors such as device aging, threshold shift of the driving transistor T1, and other factors that cause uneven light emission and low light emission efficiency. Therefore, the pixel circuit provided in this embodiment can compensate for uneven light emission and low light emission caused by device aging. efficiency.
  • the external compensation circuit 200 includes the sensing unit 10 ; the first input terminal of the sensing unit 10 is connected to the first power line in the driving circuit 100 , and the second input terminal of the sensing unit 10 is The power line is connected to obtain a corresponding real-time voltage sensing value according to the luminous intensity of the light-emitting device D1.
  • the sensing unit 10 includes a photosensitive device and a resistor R; the input end of the photosensitive device is connected to the first power line, the output end of the photosensitive device is connected to the first end of the resistor R, and the second end of the resistor R is connected to the second power supply line; wherein, the first power supply line is used to connect the first power supply signal OVDD, the second power supply line is used to connect to the second power supply signal GND, and the potential of the first power supply signal OVDD is higher than that of the second power supply The potential of the signal GND.
  • the photosensitive device is a phototransistor T3; the first power line is connected to the collector of the phototransistor T3, the emitter of the phototransistor T3 is connected to the first end of the resistor R, and the phototransistor The gate of T3 is used to detect the luminous intensity of the light-emitting device D1.
  • the photosensitive device is a photodiode DG; the first power line is connected to the anode of the photodiode DG, the cathode of the photodiode DG is connected to the first end of the resistor R, and the photodiode DG uses It is used to detect the luminous intensity of the light-emitting device D1.
  • the photosensitive device is a photoresistor RG; the first power line is connected to the first end of the photoresistor RG, the second end of the photoresistor RG is connected to the first end of the resistor R, The photoresistor RG is used to detect the luminous intensity of the light emitting device D1.
  • the external compensation circuit 200 further includes an analog-to-digital conversion unit 20; the input end of the analog-to-digital conversion unit 20 is connected to the first end of the resistor R for analog-to-digital conversion of the real-time voltage sensing value.
  • the external compensation circuit 200 further includes a control unit 30; the control unit 30 is connected to the output end of the analog-to-digital conversion unit 20, and is used for calculating the difference between the real-time sensing value and the preset sensing value, and accumulating difference to the first data signal to obtain the second data signal.
  • the external compensation circuit 200 further includes a digital-to-analog conversion unit 40; the input end of the digital-to-analog conversion unit 40 is connected to the control unit 30, and the output end of the digital-to-analog conversion unit 40 is connected to the data line DL for the digital-to-analog conversion unit 40.
  • the analog-converted second data signal is not limited to the analog-converted second data signal.
  • the external compensation circuit 200 further includes a voltage stabilization capacitor C1; the first end of the voltage stabilization capacitor C1 is connected to the first end of the resistor R; the second end of the voltage stabilization capacitor C1 is connected to the The second power supply signal GND is connected; it is used to stabilize the potential of the first end of the resistor R.
  • the driving circuit 100 further includes a driving unit, an addressing unit and a storage unit; the control terminal of the addressing unit is used to access the addressing signal WR; the input terminal of the addressing unit is connected to the The data line DL is connected to access the corresponding data signal data, for example, the first data signal or the second data signal; the output end of the addressing unit is connected to the first end of the storage unit and the control end of the driving unit, and the output end of the addressing unit is connected to the control end of the driving unit with write the data signal data to the storage unit according to the addressing signal WR; the first power line is connected to the input end of the drive unit; the output end of the drive unit is connected to the second end of the storage unit and the anode of the light-emitting device D1; the light-emitting device D1 The cathode is connected to the second power line.
  • the drive unit includes a drive transistor T1; one of the gate/source of the drive transistor T1 is connected to the first power line; the other of the gate/source of the drive transistor T1 is connected to the second end of the storage unit and emits light
  • the anode of the device D1 is connected; the gate of the drive transistor T1 is connected to the output of the addressing unit.
  • the addressing unit includes an addressing transistor T2; one of the gate/source of the addressing transistor T2 is connected to the data line DL; the other gate/source of the addressing transistor T2 is connected to the gate of the driving transistor T1 ; The gate of the addressing transistor T2 is connected to access the addressing signal WR.
  • the storage unit includes a storage capacitor Cst; the first end of the storage capacitor Cst is connected to the other of the gate of the drive transistor T1 and the gate/source of the addressing transistor T2; the second end of the storage capacitor Cst is connected to the gate of the drive transistor T1 The other of the gate/source is connected to the anode of the light emitting device D1.
  • the driving transistor T1 and the addressing transistor T2 can be, but are not limited to, N-channel thin film transistors, and can also be polysilicon thin film transistors, specifically, low temperature polysilicon thin film transistors.
  • the light-emitting device D1 may be, but not limited to, an OLED, a Micro-LED, or a Mini-LED.
  • the specific detection process of the present application is that in the detection stage, the first power supply signal OVDD maintains a high level, the addressing signal WR rises from a low level to a high level, and at the same time, the level of the data signal data changes from 0 grayscale to a high level.
  • the photosensitive device detects the luminous intensity of the light-emitting device D1, and then obtains the light-emitting current flowing through the light-emitting device D1, and obtains the real-time voltage sensing corresponding to the light-emitting current through current-voltage conversion Then compare it with the preset voltage sensing value corresponding to the target brightness.
  • the two are consistent, it means that the luminous efficiency of the light-emitting device D1 has not changed; if the two are inconsistent, it means that the luminous efficiency of the light-emitting device D1 has occurred.
  • change, or the electrical property of the driving transistor T1 has changed, at this time the voltage of the data signal data is adjusted until it is consistent with the target brightness, and the data signal data reaching the target brightness at this time has been converted from the first data signal to the second data signal, The potentials of the two at the same time are different, therefore, the luminous uniformity and luminous efficiency of the light-emitting device D1 can be compensated synchronously through the above adjustment.
  • the present application provides a display panel, which includes the pixel circuit in any of the above embodiments.
  • the display panel can be, but is not limited to, an OLED display screen, which is a display screen made of organic self-light emitting diodes. Due to the self-luminous organic electroluminescent diode, no backlight, high contrast ratio, thin thickness, wide viewing angle, fast response speed, flexible panels, wide operating temperature range, simple structure and process are excellent characteristics. , is considered to be the next-generation flat-panel display emerging application technology.
  • OLED displays are increasingly common, most notably in products such as cell phones, media players and small entry-level TVs. Unlike standard liquid crystal displays, OLED pixels are driven by a current source. To understand how and why OLED power supply affects display quality, one must first understand OLED display technology and power supply requirements. This article will describe the latest OLED display technology, discuss the main power supply requirements and solutions, and introduce innovative power supply architectures specifically for OLED power supply requirements.
  • AMOLED organic light-emitting diode
  • LC liquid crystal
  • OTFT organic thin film transistor
  • OLED display is a self-illuminating display technology that does not require any backlight at all.
  • the materials used in OLED belong to organic materials suitable for chemical structure.
  • OLED technology requires a current-controlled drive method.
  • OLEDs have electrical characteristics quite similar to standard light-emitting diodes (LEDs), with brightness depending on the LED current.
  • TFTs thin film transistors
  • VCO Voltage Controlled Oscillator
  • white light does not consume the most power, but the brightness value determines the power consumption.
  • red, blue, and green with a brightness value of 10 will produce white light with a brightness value of 30 when they are lit together. Therefore, the red, blue, and green brightness values are adjusted to 3.3 to synthesize a white light value of 10 (theoretical value). From the perspective of LED or OLED, the human eye sees the same brightness, and blue light consumes the most power.
  • Organic light-emitting display technology consists of a very thin coating of organic material and a glass substrate. These organic materials emit light when an electric charge passes through them. The color of OLED light emission depends on the material of the organic light-emitting layer, so manufacturers can obtain the desired color by changing the material of the light-emitting layer. Active-matrix organic light-emitting displays have built-in electronic circuitry so that each pixel is independently driven by a corresponding circuit. OLED has the advantages of simple structure, self-illumination without backlight, high contrast ratio, thin thickness, wide viewing angle, fast response speed, flexible panels, and wide operating temperature range. The technology provides the best way to browse photos and videos. way and imposes fewer constraints on the design of the camera.
  • the complexity and information density of automotive information systems are increasing day by day, which makes the display inside the car no longer just a basic centralized instrument display, but to meet the needs of more and more detailed and diverse in-vehicle information display.
  • the car display market is divided into car navigation devices, car TVs, and car information systems according to application; it is divided into two markets: original and after-installation according to assembly time.
  • the original market requires strict certification and is difficult to enter; the aftermarket does not require certification and is currently the largest market, about 20 times that of the original market.
  • the proportion of new cars equipped with displays that is, the proportion of the original market, will gradually increase.
  • the display products required by automotive electronics have high requirements for environmental adaptability.
  • the performance indicators of the generally required vehicle display screen are: brightness 20-60 nits, working life at room temperature 50,000 hours, and temperature tolerance range -40-85 °C.
  • VFDs Vauum Fluorescent Displays
  • OLED and LCD liquid crystal display technology VFD is gradually losing its advantages. Because VFD power consumption is large, full color and resolution are greatly limited.
  • LCD liquid crystal display technology has gradually begun to be applied in the field of vehicle display.
  • the liquid crystal display technology is subject to the influence of ambient temperature, the application field of vehicle display products is limited.
  • the liquid crystal material used to make the liquid crystal display will become liquid when the ambient temperature is too high, and it will cool to become a crystal when the temperature is too low. No matter which state it becomes, the liquid crystal material no longer has the photoelectric effect that can be controlled by the electric field. As a result, the liquid crystal display cannot work normally.
  • the contrast, viewing angle and response speed of the liquid crystal display also change with the change of temperature. Therefore, for the vehicle display with large environmental changes, the liquid crystal is not a good display method.
  • OLED Organic Electroluminescence Display Technology
  • OLED Organic Electroluminescence Display Technology
  • In-vehicle displays made with OLED technology can have a thinner and more attractive appearance, better color display quality, wider viewing range and greater design flexibility.
  • OLED environmental adaptability is far superior to The liquid crystal display can withstand the temperature range of -40 ⁇ 85°C. And OLED does not contain lead and will not pollute the environment. Therefore, OLED display applications have great advantages in the automotive field.
  • the research report shows that among the various applications of OLED panels, the car audio application market in 2005 accounted for 3% of the total shipments, and the output value reached 11%, occupying a major share of the high-end application market.
  • cars such as Ford's Aston Martin DB9, Grand Cherokee Jeep, and Chevrolet Corvette already feature monochrome OLED small-molecule passive-matrix displays that can operate for 30,000 hours before the brightness drops to 80[%] of original brightness.
  • OLED displays have brought a huge advantage to car manufacturers, they can quickly install car dashboard lighting systems without the need for perforated wiring in the car as in the past, and OLED technology can bring the perfect feeling to high-end luxury cars, for For luxury car makers and dealers, this means significant savings while making consumers happier.
  • the lifespan of OLED has been greatly improved, and the lifespan of 40,000 to 50,000 hours in a conventional environment is comparable to that of TFT-LCD.
  • Japan's Pi ONeer is the first manufacturer to have OLED products on the market. As early as 1997, it applied monochrome OLED to car audio. In 2004, it launched a full-color series of OLED audio for the first time.
  • the vehicle-mounted display OLED products launched by other companies have a working temperature range of -40 to 85°C, and the lifespan of monochrome products has reached 55,000 hours (70nit) and 50,000 hours (80nit), and the working temperature of vehicle chips is still further improving. .
  • OLED display screens can be applied to POS machines, ATM machines, copiers, game machines, etc.; in the field of communications, they can be applied to mobile phones, mobile network terminals, etc.; Commercial PCs, home PCs, and notebook computers; in the field of consumer electronics, it can be used in audio equipment, digital cameras, and portable DVDs; in industrial applications, it can be used in instruments and meters; in the field of transportation, it can be used in GPS, aircraft instruments, etc. Superior.
  • Flexible screen refers to flexible OLED.
  • the successful mass production of flexible screens is not only beneficial to the manufacture of a new generation of high-end smartphones, but also has a profound impact on the application of wearable devices due to its low power consumption and bendable characteristics.
  • the continuous penetration of the terminal is widely used.
  • Flexible screen mobile phone refers to a mobile phone with a bendable and flexible screen.
  • OLEDs are thin and can be mounted on flexible materials such as plastic or metal foil. Switching to plastic instead of glass would make the display more durable and lighter.
  • the flexible OLED panel is concave from top to bottom and has a bending radius of up to 700mm.
  • OLED uses a plastic substrate instead of a common glass substrate. It uses thin-film packaging technology and sticks a protective film on the back of the panel to make the panel bendable and not easy to break. Flexible screens can be rolled, but not folded. Future products should be foldable, and the shape will be more changeable.
  • Bendable displays also known as flexible screens, are seen as the initial product of the display revolution, with the ultimate goal of transforming mobile and wearable electronics.
  • the OLED preparation scheme is to use vacuum evaporation technology to prepare the organic functional layer and the cathode layer, which requires expensive evaporation equipment, high production cost and low production efficiency. At the same time, limited by the size of the vacuum evaporation equipment, it is difficult to realize the preparation of large-area display screens. Compared with vacuum thermal evaporation, solution preparation has the advantages of simple operation and low cost, and is suitable for low temperature or room temperature conditions, especially for the preparation of large-size OLED screens. With the rapid iteration of organic electronic technology, the liquid-phase processing technology of soluble organic materials is also becoming more and more mature. Liquid-phase method, especially printing process, is considered to be one of the key methods to solve the bottleneck of existing OLED development.
  • the purpose of the present application is to provide an OLED flexible display panel in which the inorganic thin film is not easily cracked or peeled off and a manufacturing method thereof; in order to solve the problem that the existing OLED flexible display panel is bent during the bending process, the OLED flexible display panel
  • the inorganic thin film is prone to the technical problem of cracking or peeling.
  • the OLED flexible display panel includes: a flexible substrate; an OLED light-emitting structure, disposed on the flexible substrate; an integral inorganic layer, disposed on the OLED light-emitting structure; a first organic layer, disposed on the integral inorganic layer; layer, disposed on the first organic layer, which includes alternately disposed first inorganic film layers and first split film layers; a second organic layer disposed on the first split mixed layer; and a second split mixed layer, It is arranged on the second organic layer, which comprises alternately arranged second inorganic film layers and second divided film layers; wherein the first divided film layer is an inorganic film layer or an organic film layer whose elastic modulus is smaller than that of the first inorganic film layer; The second divided film layer is an inorganic film layer or an organic film layer with an elastic modulus smaller than that of the second inorganic film layer.
  • the length of the first inorganic film layer is greater than the length of the first dividing film layer; the length of the second inorganic film layer is greater than the length of the second dividing film layer.
  • the projection of the first split film layer on the plane where the flexible substrate is located and the projection of the second split film layer on the plane where the flexible substrate is located are staggered from each other.
  • an integral inorganic layer is provided on the OLED light-emitting structure by an atomic layer deposition process.
  • the first organic layer is provided on the whole inorganic layer through a coating process or an inkjet printing process;
  • the second organic layer is provided on the first split hybrid layer through a coating process or an inkjet printing process.
  • the overall inorganic layer is an aluminum oxide layer or a silicon nitride layer; the first organic layer and the second organic layer are acrylate polymer layers, styrene polymer layers or organic layers Silicon polymer layer; the first inorganic film layer and the second inorganic film layer are aluminum oxide layer, silicon nitride layer, silicon oxide layer or silicon carbide layer.
  • the OLED flexible display panel further includes:
  • the inorganic protective layer is arranged between the OLED light-emitting structure and the overall inorganic layer.
  • Embodiments of the present invention also provide a method for fabricating an OLED flexible display panel, which includes: providing a flexible substrate; fabricating an OLED light-emitting structure on the flexible substrate; fabricating an integral inorganic layer on the flexible substrate through an atomic layer deposition process; cloth process or inkjet printing process, the first organic layer is made on the flexible substrate; the first inorganic film layer is made on the flexible substrate through the first mask; the first partition is made on the flexible substrate through the second mask a film layer, so that the first split film layer and the first inorganic film layer constitute a first split mixed layer; a second organic layer is arranged on the flexible substrate through a coating process or an inkjet printing process;
  • the second inorganic film layer is formed on the flexible substrate; and through the fourth mask, the second divided film layer is formed on the flexible substrate, so that the second divided film layer and the second inorganic film layer are formed
  • the second split mixed layer wherein the first split membrane layer is an inorganic membrane layer or an organic membrane layer with an elastic modulus smaller than the first inorganic membrane layer; the second split membrane layer is an inorganic membrane with an elastic modulus smaller than the second inorganic membrane layer layer or organic film layer.
  • the length of the first inorganic film layer is greater than the length of the first divided film layer; the length of the second inorganic film layer is greater than that of the second divided film layer.
  • the projection of the first split film layer on the plane where the flexible substrate is located and the projection of the second split film layer on the plane where the flexible substrate is located are staggered from each other.
  • the OLED flexible display panel and its manufacturing method of the present application are provided with a layered structure of a separate inorganic layer and an organic layer, so that the inorganic film in the OLED flexible display panel is less prone to cracking or cracking on the basis of better water and oxygen resistance.
  • the phenomenon of peeling off solves the technical problem that the inorganic thin film of the OLED flexible display panel is easily cracked or peeled off during the bending process of the existing OLED flexible display panel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

A pixel circuit and a display panel. A corresponding real-time sensed value is obtained by means of an external compensation circuit (200) on the basis of the light emitting intensity of a light emitting device (D1), the difference between the real-time sensed value and a preset sensed value is accumulated to a first data signal to obtain a second data signal, and the second data signal is output to a data line (DL). A data signal input to a driving circuit (100) can be compensated for in real time, thereby achieving light emitting uniformity of the pixel circuit.

Description

像素电路及显示面板Pixel circuit and display panel 技术领域technical field
本申请涉及显示技术领域，尤其涉及像素驱动技术领域，具体涉及一种像素电路及显示面板。The present application relates to the field of display technology, in particular to the field of pixel driving technology, and in particular to a pixel circuit and a display panel.
背景技术Background technique
有机电致发光二极管（organic light emitting diode，OLED）是一种自发光的显示技术，具有视角宽、对比度高、功耗低、色彩鲜艳等优点。由于这些优势，有源有机电致发光二极管（active matrix organic light emitting diode，AMOLED）在显示行业所占的比重正在逐年增加。但随着面板（panel）使用时间的延长，OLED器件的发光效率会显著下降，最终因显示不均匀等问题而失效。Organic light emitting diode (OLED) is a self-luminous display technology that has the advantages of wide viewing angle, high contrast, low power consumption, and bright colors. Due to these advantages, active organic electroluminescent diodes (active The proportion of matrix organic light emitting diode (AMOLED) in the display industry is increasing year by year. However, with the prolongation of the use time of the panel, the luminous efficiency of the OLED device will decrease significantly, and eventually it will fail due to problems such as uneven display.
技术问题technical problem
本申请提供一种像素电路及显示面板，解决了因像素电路的发光不均匀和器件老化引起的发光效率降低的问题。The present application provides a pixel circuit and a display panel, which solve the problem of reduced luminous efficiency caused by uneven luminescence of the pixel circuit and device aging.
技术解决方案technical solutions
第一方面，本申请提供一种像素电路，其包括驱动电路和外部补偿电路；驱动电路至少具有一发光器件和用于传输第一数据信号的数据线；外部补偿电路与驱动电路连接，响应于发光器件的发光强度而获取对应的实时感测值，且累加实时感测值与预设感测值的差值至第一数据信号以得出第二数据信号，以及输出第二数据信号至数据线。In a first aspect, the present application provides a pixel circuit, which includes a drive circuit and an external compensation circuit; the drive circuit at least has a light-emitting device and a data line for transmitting a first data signal; the external compensation circuit is connected to the drive circuit, and responds to the The luminous intensity of the light-emitting device is used to obtain the corresponding real-time sensing value, and the difference between the real-time sensing value and the preset sensing value is accumulated to the first data signal to obtain the second data signal, and the second data signal is output to the data. Wire.
基于第一方面，在第一方面的第一种实施方式中，外部补偿电路包括感测单元；感测单元的第一输入端与驱动电路中的第一电源线连接，感测单元的第二输入端与驱动电路中的第二电源线连接，用于根据发光器件的发光强度获取对应的实时电压感测值。Based on the first aspect, in a first implementation manner of the first aspect, the external compensation circuit includes a sensing unit; the first input end of the sensing unit is connected to the first power line in the driving circuit, and the second The input end is connected to the second power line in the driving circuit, and is used for acquiring a corresponding real-time voltage sensing value according to the luminous intensity of the light-emitting device.
基于第一方面的第一种实施方式，在第一方面的第二种实施方式中，感测单元包括光敏器件和电阻；光敏器件的输入端与第一电源线连接，光敏器件的输出端与电阻的第一端连接，电阻的第二端与第二电源线连接；其中，第一电源线用于接入第一电源信号，第二电源线用于接入第二电源信号，且第一电源信号的电位高于第二电源信号的电位。Based on the first embodiment of the first aspect, in the second embodiment of the first aspect, the sensing unit includes a photosensitive device and a resistor; the input end of the photosensitive device is connected to the first power line, and the output end of the photosensitive device is connected to the first power line. The first end of the resistor is connected, and the second end of the resistor is connected to the second power line; wherein, the first power line is used for connecting the first power signal, the second power line is used for connecting the second power signal, and the first power line is used for connecting the first power signal. The potential of the power supply signal is higher than that of the second power supply signal.
基于第一方面的第二种实施方式，在第一方面的第三种实施方式中，光敏器件为光敏三极管；第一电源线与光敏三极管的集电极连接，光敏三极管的发射极与电阻的第一端连接，光敏三极管的栅极用于侦测发光器件的发光强度。Based on the second embodiment of the first aspect, in the third embodiment of the first aspect, the photosensitive device is a phototransistor; the first power line is connected to the collector of the phototransistor, and the emitter of the phototransistor is connected to the third electrode of the resistor. One end is connected, and the gate of the phototransistor is used to detect the luminous intensity of the light-emitting device.
基于第一方面的第二种实施方式，在第一方面的第四种实施方式中，光敏器件为光敏二极管；第一电源线与光敏二极管的阳极连接，光敏二极管的阴极与电阻的第一端连接，光敏二极管用于侦测发光器件的发光强度。Based on the second embodiment of the first aspect, in the fourth embodiment of the first aspect, the photosensitive device is a photodiode; the first power line is connected to the anode of the photodiode, and the cathode of the photodiode is connected to the first end of the resistor connected, the photodiode is used to detect the luminous intensity of the light-emitting device.
基于第一方面的第二种实施方式，在第一方面的第五种实施方式中，光敏器件为光敏电阻；第一电源线与光敏电阻的第一端连接，光敏电阻的第二端与电阻的第一端连接，光敏电阻用于侦测发光器件的发光强度。Based on the second embodiment of the first aspect, in the fifth embodiment of the first aspect, the photosensitive device is a photoresistor; the first power line is connected to the first end of the photoresistor, and the second end of the photoresistor is connected to the resistor The first end is connected, and the photoresistor is used to detect the luminous intensity of the light-emitting device.
基于第一方面的第二种实施方式，在第一方面的第六种实施方式中，外部补偿电路还包括模数转换单元；模数转换单元的输入端与电阻的第一端连接，用于模数转换实时电压感测值。Based on the second implementation manner of the first aspect, in the sixth implementation manner of the first aspect, the external compensation circuit further includes an analog-to-digital conversion unit; the input end of the analog-to-digital conversion unit is connected to the first end of the resistor for Analog-to-digital conversion of real-time voltage sensed values.
基于第一方面的第二种实施方式，在第一方面的第七种实施方式中，外部补偿电路还包括控制单元；控制单元与模数转换单元的输出端连接，用于计算实时感测值与预设感测值的差值，和累加差值至第一数据信号以得出第二数据信号。Based on the second embodiment of the first aspect, in the seventh embodiment of the first aspect, the external compensation circuit further includes a control unit; the control unit is connected to the output end of the analog-to-digital conversion unit, and is used to calculate the real-time sensing value and accumulating the difference from the preset sensing value to the first data signal to obtain the second data signal.
基于第一方面的第三种实施方式，在第一方面的第四种实施方式中，外部补偿电路还包括数模转换单元；数模转换单元的输入端与控制单元连接，数模转换单元的输出端与数据线连接，用于数模转换第二数据信号。Based on the third embodiment of the first aspect, in the fourth embodiment of the first aspect, the external compensation circuit further includes a digital-to-analog conversion unit; the input end of the digital-to-analog conversion unit is connected to the control unit, and the The output end is connected to the data line and is used for digital-to-analog conversion of the second data signal.
第二方面，本申请提供一种显示面板，其包括上述任一实施方式中的像素电路。In a second aspect, the present application provides a display panel including the pixel circuit in any one of the above embodiments.
有益效果beneficial effect
本申请提供的像素电路及显示面板，通过外部补偿电路基于发光器件的发光强度而获取对应的实时感测值，且累加实时感测值与预设感测值的差值至第一数据信号以得出第二数据信号，以及输出第二数据信号至数据线，可以实时补偿驱动电路接入的数据信号，实现像素电路的发光均匀性，同时由于是基于发光器件的发光强度而不是电流进行的实时补偿，因此，在补偿的过程中，同时补偿了器件老化导致的发光效率低的问题。In the pixel circuit and display panel provided by the present application, a corresponding real-time sensing value is obtained based on the luminous intensity of the light-emitting device through an external compensation circuit, and the difference between the real-time sensing value and the preset sensing value is accumulated to the first data signal to obtain a corresponding real-time sensing value. Obtaining the second data signal and outputting the second data signal to the data line can compensate the data signal connected by the driving circuit in real time, and realize the uniformity of the light emission of the pixel circuit. Real-time compensation, therefore, in the process of compensation, the problem of low luminous efficiency caused by device aging is also compensated.
附图说明Description of drawings
图1为本申请实施例提供的像素电路的第一种结构示意图。FIG. 1 is a schematic diagram of a first structure of a pixel circuit provided by an embodiment of the present application.
图2为本申请实施例提供的像素电路的第二种结构示意图。FIG. 2 is a schematic diagram of a second structure of a pixel circuit according to an embodiment of the present application.
图3为本申请实施例提供的像素电路的第三种结构示意图。FIG. 3 is a schematic diagram of a third structure of a pixel circuit according to an embodiment of the present application.
图4为本申请实施例提供的像素电路的第四种结构示意图。FIG. 4 is a schematic diagram of a fourth structure of a pixel circuit provided by an embodiment of the present application.
图5为本申请实施例提供的像素电路的时序示意图。FIG. 5 is a schematic timing diagram of a pixel circuit according to an embodiment of the present application.
本发明的实施方式Embodiments of the present invention
为使本申请的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本申请进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。In order to make the objectives, technical solutions and effects of the present application clearer and clearer, the present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.
请参阅图1至图5，本实施例提供了一种像素电路，其包括驱动电路100和外部补偿电路200；驱动电路100至少具有一发光器件D1和用于传输第一数据信号的数据线DL；外部补偿电路200与驱动电路100连接，响应于发光器件D1的发光强度而获取对应的实时感测值，且累加实时感测值与预设感测值的差值至第一数据信号以得出第二数据信号，以及输出第二数据信号至数据线DL。Referring to FIGS. 1 to 5 , this embodiment provides a pixel circuit, which includes a driving circuit 100 and an external compensation circuit 200 ; the driving circuit 100 at least has a light-emitting device D1 and a data line DL for transmitting a first data signal ; The external compensation circuit 200 is connected to the drive circuit 100, obtains the corresponding real-time sensing value in response to the luminous intensity of the light-emitting device D1, and accumulates the difference between the real-time sensing value and the preset sensing value to the first data signal to obtain outputting the second data signal, and outputting the second data signal to the data line DL.
需要进行说明的是，第一数据信号的电位与差值之和为第二数据信号的电位。在本实施例中，由于是根据发光器件D1的发光强度获得的实时感测值，其区别于传统技术方案中直接从像素电路中感应电压或者电流的方式获得的实时感测值，因为，发光强度综合考虑了器件老化、驱动晶体管T1的阈值漂移等因素造成的发光不均匀以及发光效率低的因素，因此，本实施例提供的像素电路能够补偿发光不均匀的同时补偿器件老化导致的低发光效率。It should be noted that the sum of the potential of the first data signal and the difference is the potential of the second data signal. In this embodiment, since the real-time sensing value is obtained according to the luminous intensity of the light-emitting device D1, it is different from the real-time sensing value obtained by directly inducing voltage or current in the pixel circuit in the traditional technical solution, because the luminous The intensity comprehensively considers factors such as device aging, threshold shift of the driving transistor T1, and other factors that cause uneven light emission and low light emission efficiency. Therefore, the pixel circuit provided in this embodiment can compensate for uneven light emission and low light emission caused by device aging. efficiency.
其中，外部补偿电路200包括感测单元10；感测单元10的第一输入端与驱动电路100中的第一电源线连接，感测单元10的第二输入端与驱动电路100中的第二电源线连接，用于根据发光器件D1的发光强度获取对应的实时电压感测值。The external compensation circuit 200 includes the sensing unit 10 ; the first input terminal of the sensing unit 10 is connected to the first power line in the driving circuit 100 , and the second input terminal of the sensing unit 10 is The power line is connected to obtain a corresponding real-time voltage sensing value according to the luminous intensity of the light-emitting device D1.
在其中一个实施例中，感测单元10包括光敏器件和电阻R；光敏器件的输入端与第一电源线连接，光敏器件的输出端与电阻R的第一端连接，电阻R的第二端与第二电源线连接；其中，第一电源线用于接入第一电源信号OVDD，第二电源线用于接入第二电源信号GND，且第一电源信号OVDD的电位高于第二电源信号GND的电位。In one embodiment, the sensing unit 10 includes a photosensitive device and a resistor R; the input end of the photosensitive device is connected to the first power line, the output end of the photosensitive device is connected to the first end of the resistor R, and the second end of the resistor R is connected to the second power supply line; wherein, the first power supply line is used to connect the first power supply signal OVDD, the second power supply line is used to connect to the second power supply signal GND, and the potential of the first power supply signal OVDD is higher than that of the second power supply The potential of the signal GND.
如图1所示，在其中一个实施例中，光敏器件为光敏三极管T3；第一电源线与光敏三极管T3的集电极连接，光敏三极管T3的发射极与电阻R的第一端连接，光敏三极管T3的栅极用于侦测发光器件D1的发光强度。As shown in Figure 1, in one of the embodiments, the photosensitive device is a phototransistor T3; the first power line is connected to the collector of the phototransistor T3, the emitter of the phototransistor T3 is connected to the first end of the resistor R, and the phototransistor The gate of T3 is used to detect the luminous intensity of the light-emitting device D1.
如图2所示，在其中一个实施例中，光敏器件为光敏二极管DG；第一电源线与光敏二极管DG的阳极连接，光敏二极管DG的阴极与电阻R的第一端连接，光敏二极管DG用于侦测发光器件D1的发光强度。As shown in Figure 2, in one embodiment, the photosensitive device is a photodiode DG; the first power line is connected to the anode of the photodiode DG, the cathode of the photodiode DG is connected to the first end of the resistor R, and the photodiode DG uses It is used to detect the luminous intensity of the light-emitting device D1.
如图3所示，在其中一个实施例中，光敏器件为光敏电阻RG；第一电源线与光敏电阻RG的第一端连接，光敏电阻RG的第二端与电阻R的第一端连接，光敏电阻RG用于侦测发光器件D1的发光强度。As shown in FIG. 3 , in one embodiment, the photosensitive device is a photoresistor RG; the first power line is connected to the first end of the photoresistor RG, the second end of the photoresistor RG is connected to the first end of the resistor R, The photoresistor RG is used to detect the luminous intensity of the light emitting device D1.
在其中一个实施例中，外部补偿电路200还包括模数转换单元20；模数转换单元20的输入端与电阻R的第一端连接，用于模数转换实时电压感测值。In one embodiment, the external compensation circuit 200 further includes an analog-to-digital conversion unit 20; the input end of the analog-to-digital conversion unit 20 is connected to the first end of the resistor R for analog-to-digital conversion of the real-time voltage sensing value.
在其中一个实施例中，外部补偿电路200还包括控制单元30；控制单元30与模数转换单元20的输出端连接，用于计算实时感测值与预设感测值的差值，和累加差值至第一数据信号以得出第二数据信号。In one embodiment, the external compensation circuit 200 further includes a control unit 30; the control unit 30 is connected to the output end of the analog-to-digital conversion unit 20, and is used for calculating the difference between the real-time sensing value and the preset sensing value, and accumulating difference to the first data signal to obtain the second data signal.
在其中一个实施例中，外部补偿电路200还包括数模转换单元40；数模转换单元40的输入端与控制单元30连接，数模转换单元40的输出端与数据线DL连接，用于数模转换第二数据信号。In one embodiment, the external compensation circuit 200 further includes a digital-to-analog conversion unit 40; the input end of the digital-to-analog conversion unit 40 is connected to the control unit 30, and the output end of the digital-to-analog conversion unit 40 is connected to the data line DL for the digital-to-analog conversion unit 40. The analog-converted second data signal.
如图4所示，在其中一个实施例中，外部补偿电路200还包括稳压电容C1；稳压电容C1的第一端与电阻R的第一端连接；稳压电容C1的第二端与第二电源信号GND连接；用于稳定电阻R的第一端的电位。As shown in FIG. 4 , in one embodiment, the external compensation circuit 200 further includes a voltage stabilization capacitor C1; the first end of the voltage stabilization capacitor C1 is connected to the first end of the resistor R; the second end of the voltage stabilization capacitor C1 is connected to the The second power supply signal GND is connected; it is used to stabilize the potential of the first end of the resistor R.
如图4所示，在其中一个实施例中，驱动电路100还包括驱动单元、寻址单元以及存储单元；寻址单元的控制端用于接入寻址信号WR；寻址单元的输入端与数据线DL连接，用于接入对应的数据信号data，例如，第一数据信号，或者第二数据信号；寻址单元的输出端与存储单元的第一端和驱动单元的控制端连接，用于根据寻址信号WR写入数据信号data至存储单元；第一电源线与驱动单元的输入端连接；驱动单元的输出端与存储单元的第二端和发光器件D1的阳极连接；发光器件D1的阴极与第二电源线连接。As shown in FIG. 4 , in one embodiment, the driving circuit 100 further includes a driving unit, an addressing unit and a storage unit; the control terminal of the addressing unit is used to access the addressing signal WR; the input terminal of the addressing unit is connected to the The data line DL is connected to access the corresponding data signal data, for example, the first data signal or the second data signal; the output end of the addressing unit is connected to the first end of the storage unit and the control end of the driving unit, and the output end of the addressing unit is connected to the control end of the driving unit with write the data signal data to the storage unit according to the addressing signal WR; the first power line is connected to the input end of the drive unit; the output end of the drive unit is connected to the second end of the storage unit and the anode of the light-emitting device D1; the light-emitting device D1 The cathode is connected to the second power line.
其中，驱动单元包括驱动晶体管T1；驱动晶体管T1的栅极/源极中的一个与第一电源线连接；驱动晶体管T1的栅极/源极中的另一个与存储单元的第二端和发光器件D1的阳极连接；驱动晶体管T1的栅极与寻址单元的输出端连接。The drive unit includes a drive transistor T1; one of the gate/source of the drive transistor T1 is connected to the first power line; the other of the gate/source of the drive transistor T1 is connected to the second end of the storage unit and emits light The anode of the device D1 is connected; the gate of the drive transistor T1 is connected to the output of the addressing unit.
寻址单元包括寻址晶体管T2；寻址晶体管T2的栅极/源极中的一个与数据线DL连接；寻址晶体管T2的栅极/源极中的另一个与驱动晶体管T1的栅极连接；寻址晶体管T2的栅极用于接入寻址信号WR连接。The addressing unit includes an addressing transistor T2; one of the gate/source of the addressing transistor T2 is connected to the data line DL; the other gate/source of the addressing transistor T2 is connected to the gate of the driving transistor T1 ; The gate of the addressing transistor T2 is connected to access the addressing signal WR.
存储单元包括存储电容Cst；存储电容Cst的第一端与驱动晶体管T1的栅极和寻址晶体管T2的栅极/源极中的另一个连接；存储电容Cst的第二端与驱动晶体管T1的栅极/源极中的另一个和发光器件D1的阳极连接。The storage unit includes a storage capacitor Cst; the first end of the storage capacitor Cst is connected to the other of the gate of the drive transistor T1 and the gate/source of the addressing transistor T2; the second end of the storage capacitor Cst is connected to the gate of the drive transistor T1 The other of the gate/source is connected to the anode of the light emitting device D1.
其中，驱动晶体管T1、寻址晶体管T2均可以但不限于采用N沟道型薄膜晶体管，也可以是多晶硅薄膜晶体管，具体可以为低温多晶硅薄膜晶体管。Wherein, the driving transistor T1 and the addressing transistor T2 can be, but are not limited to, N-channel thin film transistors, and can also be polysilicon thin film transistors, specifically, low temperature polysilicon thin film transistors.
其中，发光器件D1可以但不限于为OLED，也可以是Micro-LED，还可以是Mini-LED。The light-emitting device D1 may be, but not limited to, an OLED, a Micro-LED, or a Mini-LED.
如图5所示，本申请具体的侦测过程是在侦测阶段，第一电源信号OVDD保持高电位，寻址信号WR从低电位升至高电位，同时数据信号data的电位从0灰阶向255灰阶跳变，在此过程中，光敏器件侦测发光器件D1的发光强度，进而得出流经发光器件D1的发光电流，经过电流电压转换，获得与发光电流相对应的实时电压感测值，然后与目标亮度所对应的预设电压感测值进行比较，如果两者一致，则说明发光器件D1的发光效率没有发生变化；如果两者不一致，则说明发光器件D1的发光效率发生了变化，或者驱动晶体管T1的电性发生了变化，此时调整数据信号data的电压直至与目标亮度一致，而此时达到目标亮度的数据信号data已经从第一数据信号转换为第二数据信号，两者在同一时刻的电位是不同的，因此，通过以上调整可以同步补偿发光器件D1的发光均匀性和发光效率。As shown in FIG. 5 , the specific detection process of the present application is that in the detection stage, the first power supply signal OVDD maintains a high level, the addressing signal WR rises from a low level to a high level, and at the same time, the level of the data signal data changes from 0 grayscale to a high level. 255 grayscale jump, in this process, the photosensitive device detects the luminous intensity of the light-emitting device D1, and then obtains the light-emitting current flowing through the light-emitting device D1, and obtains the real-time voltage sensing corresponding to the light-emitting current through current-voltage conversion Then compare it with the preset voltage sensing value corresponding to the target brightness. If the two are consistent, it means that the luminous efficiency of the light-emitting device D1 has not changed; if the two are inconsistent, it means that the luminous efficiency of the light-emitting device D1 has occurred. change, or the electrical property of the driving transistor T1 has changed, at this time, the voltage of the data signal data is adjusted until it is consistent with the target brightness, and the data signal data reaching the target brightness at this time has been converted from the first data signal to the second data signal, The potentials of the two at the same time are different, therefore, the luminous uniformity and luminous efficiency of the light-emitting device D1 can be compensated synchronously through the above adjustment.
在其中一个实施例中，本申请提供一种显示面板，其包括上述任一实施方式中的像素电路。In one of the embodiments, the present application provides a display panel, which includes the pixel circuit in any of the above embodiments.
该显示面板可以但不限于为OLED显示屏，其是利用有机电自发光二极管制成的显示屏。由于同时具备自发光有机电激发光二极管，不需背光源、对比度高、厚度薄、视角广、反应速度快、可用于挠曲性面板、使用温度范围广、构造及制程较简单等优异之特性，被认为是下一代的平面显示器新兴应用技术。The display panel can be, but is not limited to, an OLED display screen, which is a display screen made of organic self-light emitting diodes. Due to the self-luminous organic electroluminescent diode, no backlight, high contrast ratio, thin thickness, wide viewing angle, fast response speed, flexible panels, wide operating temperature range, simple structure and process are excellent characteristics. , is considered to be the next-generation flat-panel display emerging application technology.
有机发光二极管(OLED)显示器越来越普遍，在手机、媒体播放器及小型入门级电视等产品中最为显著。不同于标准的液晶显示器，OLED像素是由电流源所驱动。若要了解OLED电源供应如何及为何会影响显示器画质，必须先了解OLED显示器技术及电源供应需求。本文将说明最新的OLED显示器技术，并探讨主要的电源供应需求及解决方案，另外也介绍专为OLED电源供应需求而提出的创新性电源供应架构。Organic light-emitting diode (OLED) displays are increasingly common, most notably in products such as cell phones, media players and small entry-level TVs. Unlike standard liquid crystal displays, OLED pixels are driven by a current source. To understand how and why OLED power supply affects display quality, one must first understand OLED display technology and power supply requirements. This article will describe the latest OLED display technology, discuss the main power supply requirements and solutions, and introduce innovative power supply architectures specifically for OLED power supply requirements.
背板技术造就软性显示器：高分辨率彩色主动式矩阵有机发光二极管(AMOLED)显示器需要采用主动式矩阵背板，此背板使用主动式开关进行各像素的开关。液晶(LC)显示器非晶硅制程已臻成熟，可供应低成本的主动式矩阵背板，并且可用于OLED。许多公司正针对软性显示器开发有机薄膜晶体管(OTFT)背板制程，此一制程也可用于OLED显示器，以实现全彩软性显示器的推出。不论是标准或软性OLED，都需要运用相同的电源供应及驱动技术。若要了解OLED技术、功能及其与电源供应之间的互动，必须深入剖析这项技术本身。OLED显示器是一种自体发光显示器技术，完全不需要任何背光。OLED采用的材质属于化学结构适用的有机材质。OLED技术需要电流控制驱动方法　OLED具有与标准发光二极管(LED)相当类似的电气特性，亮度均取决于LED电流。若要开启和关闭OLED并控制OLED电流，需要使用薄膜晶体管(TFT)的控制电路。Backplane technology enables flexible displays: High-resolution color active-matrix organic light-emitting diode (AMOLED) displays require an active-matrix backplane that uses active switches to switch pixels on and off. Amorphous silicon processes for liquid crystal (LC) displays have matured to provide low-cost active matrix backplanes and can be used in OLEDs. Many companies are developing organic thin film transistor (OTFT) backplane processes for flexible displays, which can also be used for OLED displays to enable full-color flexible displays. Both standard and flexible OLEDs require the same power supply and drive technology. To understand OLED technology, its capabilities, and its interaction with the power supply, it is necessary to dissect the technology itself. An OLED display is a self-illuminating display technology that does not require any backlight at all. The materials used in OLED belong to organic materials suitable for chemical structure. OLED technology requires a current-controlled drive method. OLEDs have electrical characteristics quite similar to standard light-emitting diodes (LEDs), with brightness depending on the LED current. To turn the OLED on and off and control the OLED current, a control circuit using thin film transistors (TFTs) is required.
进阶节能模式可达到最高效率和任何电池供电的设备一样，只有在转换器以整体负载电流范围的最高效率进行运作时，才能达到较长的电池待机时间，这对于OLED显示器尤其重要。OLED显示器呈现全白时会耗用最大的电源，对于其它任何显示色彩则电流相对较小，这是因为只有白色需要所有红、绿、蓝子像素都全亮。举例来说，2.7寸显示器需要80mA电流来呈现全白影像，但只需要5mA电流显示其它图标或图形。因此，OLED电源供应需要针对所有负载电流达到高转换器效率。为了达到如此的效率，需要运用进阶的节能模式技术来减少负载电流，以降低转换器切换频率。由于这是透过电压控制震荡器(VCO)完成，因此能够将可能的EMI问题降至最低，并且能够将最低切换频率控制在一般40kHz的音讯范围以外，这可避免陶瓷输入或输出电容产生噪音。在手机应用中使用这类装置时，这特别重要，而且可简化设计流程。Advanced Power Save Mode for Maximum Efficiency As with any battery powered device, long battery standby times can only be achieved when the converter is operating at maximum efficiency over the overall load current range, which is especially important for OLED displays. An OLED display draws the most power when it is fully white, and relatively little current for any other display color, because only white requires all red, green, and blue subpixels to be fully lit. For example, a 2.7-inch monitor requires 80mA to present a full-white image, but only 5mA to display other icons or graphics. Therefore, OLED power supplies need to achieve high converter efficiency for all load currents. To achieve such efficiencies, advanced power-save mode techniques are required to reduce load current to reduce converter switching frequency. Since this is done with a Voltage Controlled Oscillator (VCO), possible EMI problems are minimized and the lowest switching frequency can be controlled outside the typical 40kHz audio range, which avoids noise from ceramic input or output capacitors . This is especially important when using these types of devices in mobile phone applications and simplifies the design process.
按发光特性来说白光不是耗电最大，是以亮度值来决定耗电量的。如红，蓝，绿亮度值是10的一起亮时会产生30亮度值的白光。因此将红，蓝，绿亮度值调成3.3合成一个10的白光值（理论值）。从LED或OLED来说人眼看到同样的亮度，蓝光耗电最大。According to the luminous characteristics, white light does not consume the most power, but the brightness value determines the power consumption. For example, red, blue, and green with a brightness value of 10 will produce white light with a brightness value of 30 when they are lit together. Therefore, the red, blue, and green brightness values are adjusted to 3.3 to synthesize a white light value of 10 (theoretical value). From the perspective of LED or OLED, the human eye sees the same brightness, and blue light consumes the most power.
有机发光显示技术由非常薄的有机材料涂层和玻璃基板构成。当有电荷通过时这些有机材料就会发光。OLED发光的颜色取决于有机发光层的材料，故厂商可由改变发光层的材料而得到所需之颜色。有源阵列有机发光显示屏具有内置的电子电路***因此每个像素都由一个对应的电路独立驱动。OLED具备有构造简单、自发光不需背光源、对比度高、厚度薄、视角广、反应速度快、可用于挠曲性面板、使用温度范围广等优点，技术提供了浏览照片和视频的最佳方式而且对相机的设计造成的限制较少。Organic light-emitting display technology consists of a very thin coating of organic material and a glass substrate. These organic materials emit light when an electric charge passes through them. The color of OLED light emission depends on the material of the organic light-emitting layer, so manufacturers can obtain the desired color by changing the material of the light-emitting layer. Active-matrix organic light-emitting displays have built-in electronic circuitry so that each pixel is independently driven by a corresponding circuit. OLED has the advantages of simple structure, self-illumination without backlight, high contrast ratio, thin thickness, wide viewing angle, fast response speed, flexible panels, and wide operating temperature range. The technology provides the best way to browse photos and videos. way and imposes fewer constraints on the design of the camera.
汽车信息***的复杂性和信息密度在日益上升，这使得汽车内部显示器不再仅仅是基本的集中仪表显示，而是要满足越来越详细和多样化的车内信息显示需求。车载显示器市场按应用分为车载导航装置、车载电视，以及车载信息***；按装配时间分为原装和后装两个市场。原装市场需要经过严格的认证，进入较难；后配市场则不需认证，是目前最大的市场，约是原装市场的20倍。未来随着汽车导航***等成为汽车标配，新车配备显示器的比例即原装市场的比例会逐步提升。The complexity and information density of automotive information systems are increasing day by day, which makes the display inside the car no longer just a basic centralized instrument display, but to meet the needs of more and more detailed and diverse in-vehicle information display. The car display market is divided into car navigation devices, car TVs, and car information systems according to application; it is divided into two markets: original and after-installation according to assembly time. The original market requires strict certification and is difficult to enter; the aftermarket does not require certification and is currently the largest market, about 20 times that of the original market. In the future, as car navigation systems become standard in cars, the proportion of new cars equipped with displays, that is, the proportion of the original market, will gradually increase.
汽车电子需要的显示产品，对于环境适应性要求高，普遍需求的车载显示屏的性能指标为：亮度20～60nit，常温工作寿命50000小时，耐受温度范围-40～85℃。在北美汽车显示市场，VFD（真空荧光显示器）长期以来很受欢迎，因为它们具有出色的亮度可以保证良好的可见度。但随着OLED、LCD液晶显示技术的兴起，VFD正在逐渐丧失优势。因为VFD功耗大、全彩化和解析度受到极大限制。The display products required by automotive electronics have high requirements for environmental adaptability. The performance indicators of the generally required vehicle display screen are: brightness 20-60 nits, working life at room temperature 50,000 hours, and temperature tolerance range -40-85 ℃. In the North American automotive display market, VFDs (Vacuum Fluorescent Displays) have long been popular because their excellent brightness guarantees good visibility. But with the rise of OLED and LCD liquid crystal display technology, VFD is gradually losing its advantages. Because VFD power consumption is large, full color and resolution are greatly limited.
LCD液晶显示技术逐渐开始应用在车载显示领域，然而由于液晶显示技术受制于环境温度的影响，限制了车载显示产品的应用领域。制作液晶显示屏的液晶材料在环境温度过高时会变成液体，而温度过低时会冷却变成晶体，无论变成哪种状态，液晶材料都不再具有能受电场控制的光电效应，导致液晶显示屏不能正常工作，此外液晶显示的对比度、视角、响应速度也随温度的变化而变化，因此对环境变化大的车载显示而言，液晶不是好的显示方式。LCD liquid crystal display technology has gradually begun to be applied in the field of vehicle display. However, because the liquid crystal display technology is subject to the influence of ambient temperature, the application field of vehicle display products is limited. The liquid crystal material used to make the liquid crystal display will become liquid when the ambient temperature is too high, and it will cool to become a crystal when the temperature is too low. No matter which state it becomes, the liquid crystal material no longer has the photoelectric effect that can be controlled by the electric field. As a result, the liquid crystal display cannot work normally. In addition, the contrast, viewing angle and response speed of the liquid crystal display also change with the change of temperature. Therefore, for the vehicle display with large environmental changes, the liquid crystal is not a good display method.
同成熟的TFT-LCD相比，OLED(有机电致发光显示技术)是主动发光的显示器，具有高对比度、宽视角（达170°）、快速响应（～1μs）、高发光效率、低操作电压（3～10V）、超轻薄（厚度小于2mm）等优势。利用OLED技术制作的车载显示器，可具有更轻薄迷人的外观、更优异的彩色显示画质、更宽广的观看范围和更大的设计灵活性，更重要的是OLED环境适应性要远远优越于液晶显示，可耐受的温度区间达到-40~85℃温度范围。并且OLED不含铅，不会对环境造成污染。因此OLED显示应用在车载领域具有极大的优势。Compared with mature TFT-LCD, OLED (Organic Electroluminescence Display Technology) is an active light-emitting display with high contrast ratio, wide viewing angle (up to 170°), fast response (~1μs), high luminous efficiency, and low operating voltage (3 ~ 10V), ultra-thin (thickness less than 2mm) and other advantages. In-vehicle displays made with OLED technology can have a thinner and more attractive appearance, better color display quality, wider viewing range and greater design flexibility. More importantly, OLED environmental adaptability is far superior to The liquid crystal display can withstand the temperature range of -40~85℃. And OLED does not contain lead and will not pollute the environment. Therefore, OLED display applications have great advantages in the automotive field.
调研报告显示，在OLED面板的各种应用中，2005年度汽车音响应用市场占总出货量的3%，产值达11%，占据了高端应用市场的主要份额。实际上，福特的阿斯顿·马丁DB9、大切诺基吉普车和雪佛兰Corvette等汽车已经采用了单色OLED小分子无源矩阵显示器，在亮度下降至原始亮度的80[%]以前可以工作30000小时。The research report shows that among the various applications of OLED panels, the car audio application market in 2005 accounted for 3% of the total shipments, and the output value reached 11%, occupying a major share of the high-end application market. In fact, cars such as Ford's Aston Martin DB9, Grand Cherokee Jeep, and Chevrolet Corvette already feature monochrome OLED small-molecule passive-matrix displays that can operate for 30,000 hours before the brightness drops to 80[%] of original brightness.
OLED显示屏给汽车制造商带来了巨大的优势，他们不需要和过去一样在汽车上穿孔布线，就可以迅速安装汽车仪表盘照明***，并且OLED技术能够给高端豪华汽车带来完美感觉，对于豪华汽车制造商和经销商来说，这意味着重大的节省，同时会让消费者更满意。OLED的寿命已经有了大幅度提高，常规环境下40000~50000小时的寿命已经和TFT-LCD的寿命水平相当。日本Pi ONeer是最早有OLED产品上市的厂商，早在1997年就将单色OLED应用在汽车音响上，2004年更是首次推出了全彩系列的OLED音响。其他公司推出的车载显示OLED产品，工作温度范围都达到了-40～85℃，单色产品的寿命达到了55000小时（70nit）和50000小时（80nit），车载芯片的工作温度还在进一步提高中。OLED displays have brought a huge advantage to car manufacturers, they can quickly install car dashboard lighting systems without the need for perforated wiring in the car as in the past, and OLED technology can bring the perfect feeling to high-end luxury cars, for For luxury car makers and dealers, this means significant savings while making consumers happier. The lifespan of OLED has been greatly improved, and the lifespan of 40,000 to 50,000 hours in a conventional environment is comparable to that of TFT-LCD. Japan's Pi ONeer is the first manufacturer to have OLED products on the market. As early as 1997, it applied monochrome OLED to car audio. In 2004, it launched a full-color series of OLED audio for the first time. The vehicle-mounted display OLED products launched by other companies have a working temperature range of -40 to 85°C, and the lifespan of monochrome products has reached 55,000 hours (70nit) and 50,000 hours (80nit), and the working temperature of vehicle chips is still further improving. .
由于上述优点，在商业领域OLED显示屏可以适用于POS机和ATM机、复印机、游戏机等；在通讯领域则可适用于手机、移动网络终端等领域；在计算机领域则可大量应用在PDA、商用PC和家用PC、笔记本电脑上；消费类电子产品领域，则可适用于音响设备、数码相机、便携式DVD；在工业应用领域则适用于仪器仪表等；在交通领域则用在GPS、飞机仪表上等。Due to the above advantages, in the commercial field, OLED display screens can be applied to POS machines, ATM machines, copiers, game machines, etc.; in the field of communications, they can be applied to mobile phones, mobile network terminals, etc.; Commercial PCs, home PCs, and notebook computers; in the field of consumer electronics, it can be used in audio equipment, digital cameras, and portable DVDs; in industrial applications, it can be used in instruments and meters; in the field of transportation, it can be used in GPS, aircraft instruments, etc. Superior.
柔性屏幕，指的是柔性OLED。柔性屏幕的成功量产不仅重大利好于新一代高端智能手机的制造，也因其低功耗、可弯曲的特性对可穿戴式设备的应用带来深远的影响，未来柔性屏幕将随着个人智能终端的不断渗透而广泛应用。Flexible screen refers to flexible OLED. The successful mass production of flexible screens is not only beneficial to the manufacture of a new generation of high-end smartphones, but also has a profound impact on the application of wearable devices due to its low power consumption and bendable characteristics. The continuous penetration of the terminal is widely used.
柔性屏手机是指采用可弯曲、柔韧性佳屏幕的手机，因为形似芒卷，又被称为卷芒手机。Flexible screen mobile phone refers to a mobile phone with a bendable and flexible screen.
OLED很薄，可以装在塑料或金属箔片等柔性材料上。不用玻璃而改用塑料的话，会让显示屏更耐用、更轻。柔性OLED面板从顶部到底部呈凹型，弯曲半径可达700毫米。OLEDs are thin and can be mounted on flexible materials such as plastic or metal foil. Switching to plastic instead of glass would make the display more durable and lighter. The flexible OLED panel is concave from top to bottom and has a bending radius of up to 700mm.
OLED采用塑料基板，而非常见的玻璃基板，其借助薄膜封装技术，并在面板背面粘贴保护膜，让面板变得可弯曲，不易折断。柔性屏可以卷曲，但不能折叠，未来的产品应该可以折叠，外形会更多变。OLED uses a plastic substrate instead of a common glass substrate. It uses thin-film packaging technology and sticks a protective film on the back of the panel to make the panel bendable and not easy to break. Flexible screens can be rolled, but not folded. Future products should be foldable, and the shape will be more changeable.
显示屏由面板切割而来。可弯曲的显示屏又称为柔性屏，其被视作显示屏革命的初级阶段产物，最终目标是让移动和可穿戴电子设备改头换面。The display is cut from the panel. Bendable displays, also known as flexible screens, are seen as the initial product of the display revolution, with the ultimate goal of transforming mobile and wearable electronics.
OLED制备方案是采用真空蒸镀技术制备有机功能层和阴极层，这就需要昂贵的蒸镀设备，生产成本高且生产效率低。同时，受限于真空蒸镀设备的尺寸，难以实现大面积显示屏的制备。相比于真空热蒸镀，溶液法制备具有操作简单、成本低等优势，并且适用于低温或室温条件下，特别是对于大尺寸OLED屏幕的制备。随着有机电子技术的快速迭代，可溶性的有机材料的液相加工技术也日益成熟，液相法特别是印刷工艺制备OLED被认为是解决现有OLED发展瓶颈的关键方法之一。The OLED preparation scheme is to use vacuum evaporation technology to prepare the organic functional layer and the cathode layer, which requires expensive evaporation equipment, high production cost and low production efficiency. At the same time, limited by the size of the vacuum evaporation equipment, it is difficult to realize the preparation of large-area display screens. Compared with vacuum thermal evaporation, solution preparation has the advantages of simple operation and low cost, and is suitable for low temperature or room temperature conditions, especially for the preparation of large-size OLED screens. With the rapid iteration of organic electronic technology, the liquid-phase processing technology of soluble organic materials is also becoming more and more mature. Liquid-phase method, especially printing process, is considered to be one of the key methods to solve the bottleneck of existing OLED development.
但是采用印刷工艺制备OLED也存在一定的技术难点，比如最上层金属电极溶液会对下层材料产生渗透和破坏，导致器件漏电而不能正常工作。上海幂方电子科技有限公司致力于OLED显示的全印刷制备，特别是解决上层金属电极的液相法制备工艺。经过两年的潜心研发，开发了独有的醇系和有机系电子传输层墨水，打印或者印刷顶层电极时，可有效阻挡电极溶液的渗透，从而实现全印刷工艺制备。特别是，全印刷制程工艺，无需蒸镀仪器或者定制掩膜版即可实现特定图案发光。However, there are certain technical difficulties in the preparation of OLED by printing process. For example, the uppermost metal electrode solution will penetrate and destroy the lower layer material, resulting in leakage of the device and failure of normal operation. Shanghai Mifang Electronic Technology Co., Ltd. is committed to the full printing preparation of OLED displays, especially the liquid phase preparation process for the upper metal electrode. After two years of painstaking research and development, a unique alcohol-based and organic-based electron transport layer ink has been developed. When printing or printing the top electrode, it can effectively block the penetration of the electrode solution, thus realizing the full printing process preparation. In particular, the full printing process technology can achieve specific pattern luminescence without the need for evaporation equipment or custom masks.
在其中一个实施例中，本申请的目的在于提供一种无机薄膜不易产生破裂或剥离的OLED柔性显示面板及其制作方法；以解决现有的OLED柔性显示面板在弯曲过程中，OLED柔性显示面板的无机薄膜容易产生破裂或剥离的技术问题。In one of the embodiments, the purpose of the present application is to provide an OLED flexible display panel in which the inorganic thin film is not easily cracked or peeled off and a manufacturing method thereof; in order to solve the problem that the existing OLED flexible display panel is bent during the bending process, the OLED flexible display panel The inorganic thin film is prone to the technical problem of cracking or peeling.
该OLED柔性显示面板，其包括：柔性基板；OLED发光结构，设置在柔性基板上；整体无机层，设置在OLED发光结构上；第一有机层，设置在整体无机层上；第一分体混合层，设置在第一有机层上，其包括交替设置的第一无机膜层和第一分割膜层；第二有机层，设置在第一分体混合层上；以及第二分体混合层，设置在第二有机层上，其包括交替设置的第二无机膜层和第二分割膜层；其中第一分割膜层为弹性模量小于第一无机膜层的无机膜层或有机膜层；第二分割膜层为弹性模量小于第二无机膜层的无机膜层或有机膜层。The OLED flexible display panel includes: a flexible substrate; an OLED light-emitting structure, disposed on the flexible substrate; an integral inorganic layer, disposed on the OLED light-emitting structure; a first organic layer, disposed on the integral inorganic layer; layer, disposed on the first organic layer, which includes alternately disposed first inorganic film layers and first split film layers; a second organic layer disposed on the first split mixed layer; and a second split mixed layer, It is arranged on the second organic layer, which comprises alternately arranged second inorganic film layers and second divided film layers; wherein the first divided film layer is an inorganic film layer or an organic film layer whose elastic modulus is smaller than that of the first inorganic film layer; The second divided film layer is an inorganic film layer or an organic film layer with an elastic modulus smaller than that of the second inorganic film layer.
在本申请的OLED柔性显示面板中，第一无机膜层的长度大于第一分割膜层的长度；第二无机膜层的长度大于第二分割膜层的长度。In the OLED flexible display panel of the present application, the length of the first inorganic film layer is greater than the length of the first dividing film layer; the length of the second inorganic film layer is greater than the length of the second dividing film layer.
在本申请的OLED柔性显示面板中，第一分割膜层在柔性基板所在平面上的投影与第二分割膜层在柔性基板所在平面上的投影相互错开。In the OLED flexible display panel of the present application, the projection of the first split film layer on the plane where the flexible substrate is located and the projection of the second split film layer on the plane where the flexible substrate is located are staggered from each other.
在本申请的OLED柔性显示面板中，通过原子层沉积工艺在OLED发光结构上设置整体无机层。In the OLED flexible display panel of the present application, an integral inorganic layer is provided on the OLED light-emitting structure by an atomic layer deposition process.
在本申请的OLED柔性显示面板中，通过涂布工艺或喷墨印刷工艺在整体无机层设置第一有机层；In the OLED flexible display panel of the present application, the first organic layer is provided on the whole inorganic layer through a coating process or an inkjet printing process;
通过涂布工艺或喷墨印刷工艺在第一分体混合层上设置第二有机层。The second organic layer is provided on the first split hybrid layer through a coating process or an inkjet printing process.
在本申请的OLED柔性显示面板中，整体无机层为三氧化二铝层或氮化硅层；第一有机层和第二有机层为丙烯酸酯类聚合物层、苯乙烯类聚合物层或有机硅类聚合物层；第一无机膜层和第二无机膜层为三氧化二铝层、氮化硅层、氧化硅层或碳化硅层。In the OLED flexible display panel of the present application, the overall inorganic layer is an aluminum oxide layer or a silicon nitride layer; the first organic layer and the second organic layer are acrylate polymer layers, styrene polymer layers or organic layers Silicon polymer layer; the first inorganic film layer and the second inorganic film layer are aluminum oxide layer, silicon nitride layer, silicon oxide layer or silicon carbide layer.
在本申请的OLED柔性显示面板中，OLED柔性显示面板还包括：In the OLED flexible display panel of the present application, the OLED flexible display panel further includes:
无机保护层，设置在OLED发光结构和整体无机层之间。The inorganic protective layer is arranged between the OLED light-emitting structure and the overall inorganic layer.
本发明实施例还提供一种OLED柔性显示面板的制作方法，其包括：提供一柔性基板；在柔性基板上制作OLED发光结构；通过原子层沉积工艺，在柔性基板上制作整体无机层；通过涂布工艺或喷墨印刷工艺，在柔性基板上制作第一有机层；通过第一遮罩，在柔性基板上制作第一无机膜层；通过第二遮罩，在柔型基板上制作第一分割膜层，以使得第一分割膜层和第一无机膜层构成第一分体混合层；通过涂布工艺或喷墨印刷工艺，在柔性基板设置第二有机层；Embodiments of the present invention also provide a method for fabricating an OLED flexible display panel, which includes: providing a flexible substrate; fabricating an OLED light-emitting structure on the flexible substrate; fabricating an integral inorganic layer on the flexible substrate through an atomic layer deposition process; cloth process or inkjet printing process, the first organic layer is made on the flexible substrate; the first inorganic film layer is made on the flexible substrate through the first mask; the first partition is made on the flexible substrate through the second mask a film layer, so that the first split film layer and the first inorganic film layer constitute a first split mixed layer; a second organic layer is arranged on the flexible substrate through a coating process or an inkjet printing process;
通过第三遮罩，在柔型基板上制作第二无机膜层；以及通过第四遮罩，在柔性基板上制作第二分割膜层，以使得第二分割膜层和第二无机膜层构成第二分体混合层；其中第一分割膜层为弹性模量小于第一无机膜层的无机膜层或有机膜层；第二分割膜层为弹性模量小于第二无机膜层的无机膜层或有机膜层。Through the third mask, the second inorganic film layer is formed on the flexible substrate; and through the fourth mask, the second divided film layer is formed on the flexible substrate, so that the second divided film layer and the second inorganic film layer are formed The second split mixed layer; wherein the first split membrane layer is an inorganic membrane layer or an organic membrane layer with an elastic modulus smaller than the first inorganic membrane layer; the second split membrane layer is an inorganic membrane with an elastic modulus smaller than the second inorganic membrane layer layer or organic film layer.
在本申请的OLED柔性显示面板的制作方法中，第一无机膜层的长度大于第一分割膜层的长度；第二无机膜层的长度大于第二分割膜层的长度。In the manufacturing method of the OLED flexible display panel of the present application, the length of the first inorganic film layer is greater than the length of the first divided film layer; the length of the second inorganic film layer is greater than that of the second divided film layer.
在本申请的OLED柔性显示面板的制作方法中，第一分割膜层在柔性基板所在平面上的投影与第二分割膜层在柔性基板所在平面上的投影相互错开。In the manufacturing method of the OLED flexible display panel of the present application, the projection of the first split film layer on the plane where the flexible substrate is located and the projection of the second split film layer on the plane where the flexible substrate is located are staggered from each other.
本申请的OLED柔性显示面板及其制作方法通过设置分体无机层和有机层的层叠结构，使得OLED柔性显示面板中的无机薄膜在可以较好的阻水阻氧的基础上，不易产生破裂或剥离的现象；解决了现有的OLED柔性显示面板在弯曲过程中，OLED柔性显示面板的无机薄膜容易产生破裂或剥离的技术问题。The OLED flexible display panel and its manufacturing method of the present application are provided with a layered structure of a separate inorganic layer and an organic layer, so that the inorganic film in the OLED flexible display panel is less prone to cracking or cracking on the basis of better water and oxygen resistance. The phenomenon of peeling off; solves the technical problem that the inorganic thin film of the OLED flexible display panel is easily cracked or peeled off during the bending process of the existing OLED flexible display panel.
可以理解的是，对本领域普通技术人员来说，可以根据本申请的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本申请所附的权利要求的保护范围。It can be understood that for those of ordinary skill in the art, equivalent replacements or changes can be made according to the technical solutions and inventive concepts of the present application, and all these changes or replacements should belong to the protection scope of the appended claims of the present application.

Claims (20)

  1. 一种像素电路，其中，包括：A pixel circuit, comprising:
    驱动电路，所述驱动电路至少具有一发光器件和用于传输第一数据信号的数据线；和a drive circuit, the drive circuit at least has a light-emitting device and a data line for transmitting a first data signal; and
    外部补偿电路，与所述驱动电路连接，响应于所述发光器件的发光强度而获取对应的实时感测值，且累加所述实时感测值与预设感测值的差值至所述第一数据信号以得出第二数据信号，以及输出所述第二数据信号至所述数据线。an external compensation circuit, connected to the drive circuit, obtains a corresponding real-time sensing value in response to the luminous intensity of the light-emitting device, and accumulates the difference between the real-time sensing value and the preset sensing value to the first a data signal to derive a second data signal, and outputting the second data signal to the data line.
  2. 根据权利要求1所述的像素电路，其中，所述外部补偿电路包括感测单元；The pixel circuit of claim 1, wherein the external compensation circuit comprises a sensing unit;
    所述感测单元的第一输入端与所述驱动电路中的第一电源线连接，所述感测单元的第二输入端与所述驱动电路中的第二电源线连接，用于根据所述发光器件的发光强度获取对应的实时电压感测值。The first input end of the sensing unit is connected to the first power supply line in the driving circuit, and the second input end of the sensing unit is connected to the second power supply line in the driving circuit, for The corresponding real-time voltage sensing value is obtained from the luminous intensity of the light-emitting device.
  3. 根据权利要求2所述的像素电路，其中，所述感测单元包括光敏器件和电阻；The pixel circuit of claim 2, wherein the sensing unit comprises a photosensitive device and a resistor;
    所述光敏器件的输入端与所述第一电源线连接，所述光敏器件的输出端与所述电阻的第一端连接，所述电阻的第二端与所述第二电源线连接；The input end of the photosensitive device is connected to the first power line, the output end of the photosensitive device is connected to the first end of the resistor, and the second end of the resistor is connected to the second power line;
    其中，所述第一电源线用于接入第一电源信号，所述第二电源线用于接入第二电源信号，且所述第一电源信号的电位高于所述第二电源信号的电位。Wherein, the first power line is used for connecting a first power signal, the second power line is used for connecting a second power signal, and the potential of the first power signal is higher than that of the second power signal potential.
  4. 根据权利要求3所述的像素电路，其中，所述光敏器件为光敏三极管；The pixel circuit according to claim 3, wherein the photosensitive device is a phototransistor;
    所述第一电源线与所述光敏三极管的集电极连接，所述光敏三极管的发射极与所述电阻的第一端连接，所述光敏三极管的栅极用于侦测所述发光器件的发光强度。The first power line is connected to the collector of the phototransistor, the emitter of the phototransistor is connected to the first end of the resistor, and the gate of the phototransistor is used to detect the light-emitting of the light-emitting device strength.
  5. 根据权利要求3所述的像素电路，其中，所述光敏器件为光敏二极管；The pixel circuit according to claim 3, wherein the photosensitive device is a photodiode;
    所述第一电源线与所述光敏二极管的阳极连接，所述光敏二极管的阴极与所述电阻的第一端连接，所述光敏二极管用于侦测所述发光器件的发光强度。The first power line is connected to the anode of the photodiode, the cathode of the photodiode is connected to the first end of the resistor, and the photodiode is used to detect the luminous intensity of the light-emitting device.
  6. 根据权利要求3所述的像素电路，其中，所述光敏器件为光敏电阻；The pixel circuit according to claim 3, wherein the photosensitive device is a photoresistor;
    所述第一电源线与所述光敏电阻的第一端连接，所述光敏电阻的第二端与所述电阻的第一端连接，所述光敏电阻用于侦测所述发光器件的发光强度。The first power line is connected to the first end of the photoresistor, the second end of the photoresistor is connected to the first end of the resistor, and the photoresistor is used to detect the luminous intensity of the light-emitting device .
  7. 根据权利要求3所述的像素电路，其中，所述外部补偿电路还包括模数转换单元；The pixel circuit of claim 3, wherein the external compensation circuit further comprises an analog-to-digital conversion unit;
    所述模数转换单元的输入端与所述电阻的第一端连接，用于模数转换所述实时电压感测值。The input end of the analog-to-digital conversion unit is connected to the first end of the resistor for analog-to-digital conversion of the real-time voltage sensing value.
  8. 根据权利要求3所述的像素电路，其中，所述外部补偿电路还包括控制单元；The pixel circuit of claim 3, wherein the external compensation circuit further comprises a control unit;
    所述控制单元与所述模数转换单元的输出端连接，用于计算所述实时感测值与预设感测值的差值，和累加所述差值至所述第一数据信号以得出第二数据信号。The control unit is connected to the output end of the analog-to-digital conversion unit, and is used for calculating the difference between the real-time sensing value and the preset sensing value, and accumulating the difference to the first data signal to obtain A second data signal is output.
  9. 根据权利要求4所述的像素电路，其中，所述外部补偿电路还包括数模转换单元；The pixel circuit according to claim 4, wherein the external compensation circuit further comprises a digital-to-analog conversion unit;
    所述数模转换单元的输入端与所述控制单元连接，所述数模转换单元的输出端与所述数据线连接，用于数模转换所述第二数据信号。The input terminal of the digital-to-analog conversion unit is connected to the control unit, and the output terminal of the digital-to-analog conversion unit is connected to the data line for digital-to-analog conversion of the second data signal.
  10. 一种显示面板，其中，包括如权利要求1所述的像素电路。A display panel comprising the pixel circuit of claim 1 .
  11. 根据权利要求10所述的显示面板，其中，所述驱动电路还包括驱动单元、寻址单元以及存储单元；所述寻址单元的控制端用于接入寻址信号；所述寻址单元的输入端与数据线连接，用于接入对应的数据信号；所述寻址单元的输出端与所述存储单元的第一端和所述驱动单元的控制端连接，用于根据所述寻址信号写入所述数据信号至所述存储单元；第一电源线与所述驱动单元的输入端连接；所述驱动单元的输出端与所述存储单元的第二端和发光器件的阳极连接；所述发光器件的阴极与第二电源线连接。The display panel according to claim 10, wherein the driving circuit further comprises a driving unit, an addressing unit and a storage unit; a control terminal of the addressing unit is used for accessing an addressing signal; The input end is connected with the data line for accessing the corresponding data signal; the output end of the addressing unit is connected with the first end of the storage unit and the control end of the driving unit, and is used for accessing according to the addressing unit writing the data signal into the storage unit; the first power line is connected to the input end of the drive unit; the output end of the drive unit is connected to the second end of the storage unit and the anode of the light-emitting device; The cathode of the light-emitting device is connected to the second power line.
  12. 根据权利要求11所述的显示面板，其中，所述驱动单元包括驱动晶体管；所述驱动晶体管的栅极/源极中的一个与所述第一电源线连接；所述驱动晶体管的栅极/源极中的另一个与所述存储单元的第二端和所述发光器件的阳极连接；所述驱动晶体管的栅极与所述寻址单元的输出端连接。The display panel according to claim 11, wherein the driving unit comprises a driving transistor; one of the gate/source of the driving transistor is connected to the first power supply line; the gate/source of the driving transistor is connected to the first power supply line; The other one of the source electrodes is connected with the second terminal of the storage unit and the anode of the light emitting device; the gate electrode of the driving transistor is connected with the output terminal of the addressing unit.
  13. 根据权利要求12所述的显示面板，其中，所述寻址单元包括寻址晶体管；所述寻址晶体管的栅极/源极中的一个与所述数据线连接；所述寻址晶体管的栅极/源极中的另一个与所述驱动晶体管的栅极连接；所述寻址晶体管的栅极用于接入所述寻址信号。13. The display panel of claim 12, wherein the addressing unit comprises an addressing transistor; one of a gate/source of the addressing transistor is connected to the data line; a gate of the addressing transistor The other one of the electrode/source is connected to the gate of the driving transistor; the gate of the addressing transistor is used to access the addressing signal.
  14. 根据权利要求13所述的显示面板，其中，所述存储单元包括存储电容；所述存储电容的第一端与所述驱动晶体管的栅极和所述寻址晶体管的栅极/源极中的另一个连接；所述存储电容的第二端与所述驱动晶体管的栅极/源极中的另一个和所述发光器件的阳极连接。14. The display panel of claim 13, wherein the storage unit comprises a storage capacitor; a first end of the storage capacitor is connected to a gate of the driving transistor and a gate/source of the addressing transistor The other is connected; the second end of the storage capacitor is connected to the other of the gate/source of the drive transistor and the anode of the light emitting device.
  15. 根据权利要求14所述的显示面板，其中，所述驱动晶体管、所述寻址晶体管中的至少一个为N沟道型低温多晶硅薄膜晶体管。The display panel of claim 14, wherein at least one of the driving transistor and the addressing transistor is an N-channel low temperature polysilicon thin film transistor.
  16. 根据权利要求15所述的显示面板，其中，所述外部补偿电路包括感测单元；The display panel of claim 15, wherein the external compensation circuit comprises a sensing unit;
    所述感测单元的第一输入端与所述驱动电路中的第一电源线连接，所述感测单元的第二输入端与所述驱动电路中的第二电源线连接，用于根据所述发光器件的发光强度获取对应的实时电压感测值。The first input end of the sensing unit is connected to the first power supply line in the driving circuit, and the second input end of the sensing unit is connected to the second power supply line in the driving circuit, for The corresponding real-time voltage sensing value is obtained from the luminous intensity of the light-emitting device.
  17. 根据权利要求16所述的显示面板，其中，所述感测单元包括光敏器件和电阻；The display panel of claim 16, wherein the sensing unit comprises a photosensitive device and a resistor;
    所述光敏器件的输入端与所述第一电源线连接，所述光敏器件的输出端与所述电阻的第一端连接，所述电阻的第二端与所述第二电源线连接；The input end of the photosensitive device is connected to the first power line, the output end of the photosensitive device is connected to the first end of the resistor, and the second end of the resistor is connected to the second power line;
    其中，所述第一电源线用于接入第一电源信号，所述第二电源线用于接入第二电源信号，且所述第一电源信号的电位高于所述第二电源信号的电位。Wherein, the first power line is used for connecting a first power signal, the second power line is used for connecting a second power signal, and the potential of the first power signal is higher than that of the second power signal potential.
  18. 根据权利要求17所述的显示面板，其中，所述光敏器件为光敏三极管；The display panel according to claim 17, wherein the photosensitive device is a phototransistor;
    所述第一电源线与所述光敏三极管的集电极连接，所述光敏三极管的发射极与所述电阻的第一端连接，所述光敏三极管的栅极用于侦测所述发光器件的发光强度。The first power line is connected to the collector of the phototransistor, the emitter of the phototransistor is connected to the first end of the resistor, and the gate of the phototransistor is used to detect the light-emitting of the light-emitting device strength.
  19. 根据权利要求17所述的显示面板，其中，所述光敏器件为光敏二极管；The display panel of claim 17, wherein the photosensitive device is a photodiode;
    所述第一电源线与所述光敏二极管的阳极连接，所述光敏二极管的阴极与所述电阻的第一端连接，所述光敏二极管用于侦测所述发光器件的发光强度。The first power line is connected to the anode of the photodiode, the cathode of the photodiode is connected to the first end of the resistor, and the photodiode is used to detect the luminous intensity of the light-emitting device.
  20. 根据权利要求17所述的显示面板，其中，所述光敏器件为光敏电阻；The display panel of claim 17, wherein the photosensitive device is a photoresistor;
    所述第一电源线与所述光敏电阻的第一端连接，所述光敏电阻的第二端与所述电阻的第一端连接，所述光敏电阻用于侦测所述发光器件的发光强度。The first power line is connected to the first end of the photoresistor, the second end of the photoresistor is connected to the first end of the resistor, and the photoresistor is used to detect the luminous intensity of the light-emitting device .
PCT/CN2020/138013 2020-12-02 2020-12-21 Pixel circuit and display panel WO2022116306A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202011401634.X 2020-12-02
CN202011401634.XA CN112365848A (en) 2020-12-02 2020-12-02 Pixel circuit and display panel

Publications (1)

Publication Number Publication Date
WO2022116306A1 true WO2022116306A1 (en) 2022-06-09

Family

ID=74535063

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/138013 WO2022116306A1 (en) 2020-12-02 2020-12-21 Pixel circuit and display panel

Country Status (2)

Country Link
CN (1) CN112365848A (en)
WO (1) WO2022116306A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113808529B (en) * 2021-09-28 2023-03-21 深圳市华星光电半导体显示技术有限公司 Pixel circuit and external compensation method thereof
CN114038400A (en) * 2021-10-21 2022-02-11 重庆康佳光电技术研究院有限公司 Light emitting diode driving circuit and method, display panel and driving method thereof
CN114283737B (en) * 2021-12-24 2024-04-26 深圳市华星光电半导体显示技术有限公司 Display panel, display driving method and display device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101887688A (en) * 2009-05-12 2010-11-17 索尼公司 Display device, light detection method and electronic installation
CN104658474A (en) * 2013-11-20 2015-05-27 乐金显示有限公司 Organic light emitting display and method of compensation for threshold voltage thereof
US9514681B2 (en) * 2013-11-25 2016-12-06 Samsung Display Co., Ltd. Pixel circuit for increasing accuracy of current sensing
CN107731171A (en) * 2017-11-29 2018-02-23 合肥京东方光电科技有限公司 Image element circuit and its control method, display base plate, display device
CN108877653A (en) * 2018-06-29 2018-11-23 京东方科技集团股份有限公司 Pixel circuit, display device and its manufacturing method
CN111063302A (en) * 2019-12-17 2020-04-24 深圳市华星光电半导体显示技术有限公司 Pixel hybrid compensation circuit and pixel hybrid compensation method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104900186B (en) * 2015-06-15 2017-05-31 京东方科技集团股份有限公司 OLED pixel circuit and its display device
CN105609029B (en) * 2016-03-24 2019-10-01 深圳市华星光电技术有限公司 Sense the system and AMOLED display device of AMOLED pixel driver characteristic
CN106991965B (en) * 2017-05-08 2019-08-13 深圳市华星光电半导体显示技术有限公司 A kind of compensation of ageing system and method for OLED device
CN109767725A (en) * 2019-03-19 2019-05-17 京东方科技集团股份有限公司 A kind of pixel-driving circuit and its driving method, display device
CN109859691B (en) * 2019-03-25 2021-01-15 深圳市华星光电半导体显示技术有限公司 Circuit and compensation method thereof
CN110880293B (en) * 2019-12-09 2021-04-06 合肥视涯技术有限公司 Pixel compensation circuit, display panel and pixel compensation method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101887688A (en) * 2009-05-12 2010-11-17 索尼公司 Display device, light detection method and electronic installation
CN104658474A (en) * 2013-11-20 2015-05-27 乐金显示有限公司 Organic light emitting display and method of compensation for threshold voltage thereof
US9514681B2 (en) * 2013-11-25 2016-12-06 Samsung Display Co., Ltd. Pixel circuit for increasing accuracy of current sensing
CN107731171A (en) * 2017-11-29 2018-02-23 合肥京东方光电科技有限公司 Image element circuit and its control method, display base plate, display device
CN108877653A (en) * 2018-06-29 2018-11-23 京东方科技集团股份有限公司 Pixel circuit, display device and its manufacturing method
CN111063302A (en) * 2019-12-17 2020-04-24 深圳市华星光电半导体显示技术有限公司 Pixel hybrid compensation circuit and pixel hybrid compensation method

Also Published As

Publication number Publication date
CN112365848A (en) 2021-02-12

Similar Documents

Publication Publication Date Title
WO2022116306A1 (en) Pixel circuit and display panel
US10249687B2 (en) Self-light emitting display unit and electronic device
CN107369698B (en) Organic light emitting diode display device and method of manufacturing connection structure
CN103779380A (en) Organic light emitting device and manufacturing method thereof
US9947728B2 (en) Hybrid MEMS OLED display
KR20120134222A (en) White organic light emitting diode display device
US20100039454A1 (en) Display device
CN103891408B (en) Display floater, display unit and electronic equipment
CN103839966A (en) Both-sides emission type display
US7315293B2 (en) Organic light-emitting diode display device
US20090015145A1 (en) Organic light emitting device
US20240056096A1 (en) Decoding method, decoding device, and readable storage medium
US20090121230A1 (en) Light emitting device
JP2011141412A (en) Organic el display device, driving method of the same, and electronic equipment
WO2016197524A1 (en) Organic electroluminescent display device, display apparatus, and manufacturing method therefor
CN1784101A (en) Double side display organic electroluminescence light emitting device
WO2003091982A1 (en) Display device and electronic apparatus
CN100382336C (en) Organic luminous diode display device
KR20060058043A (en) Display device
KR100541830B1 (en) Driving apparatus and method of a display device for automatically adjusting the optimum brightness under limited power consumption
US20240019950A1 (en) Touch display panel and electronic equipment
Chung et al. 40.1: Invited Paper: AMOLED Technology for Mobile Displays
CN112953682A (en) Decoding method, decoding apparatus, and readable storage medium
JP2004139825A (en) Electroluminescent element and display device
KR101475069B1 (en) Manufacturing method for Organic light emitting device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20964151

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20964151

Country of ref document: EP

Kind code of ref document: A1