CN112365848A - Pixel circuit and display panel - Google Patents
Pixel circuit and display panel Download PDFInfo
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- CN112365848A CN112365848A CN202011401634.XA CN202011401634A CN112365848A CN 112365848 A CN112365848 A CN 112365848A CN 202011401634 A CN202011401634 A CN 202011401634A CN 112365848 A CN112365848 A CN 112365848A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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
Abstract
The application discloses pixel circuit and display panel, through the luminous intensity of external compensation circuit based on luminescent device and acquire corresponding real-time sensing value, and accumulate the difference of real-time sensing value and predetermine sensing value to first data signal in order to obtain the second data signal, and output the second data signal to the data line, the data signal that can real-time compensation drive circuit access, realize pixel circuit's luminous homogeneity, simultaneously because the luminous intensity based on luminescent device carries out the real-time compensation rather than the electric current, consequently, at the in-process of compensation, the problem that luminous efficiency is low that the device ageing leads to has been compensated simultaneously.
Description
Technical Field
The application relates to the technical field of display, in particular to the technical field of pixel driving, and particularly relates to a pixel circuit and a display panel.
Background
An Organic Light Emitting Diode (OLED) is a self-luminous display technology, and has the advantages of wide viewing angle, high contrast, low power consumption, bright color, and the like. Due to these advantages, the proportion of active organic light emitting diodes (AMOLEDs) in the display industry is increasing year by year. However, as the panel (panel) is used for a longer time, the light emitting efficiency of the OLED device is significantly reduced, and finally, the OLED device fails due to problems such as display unevenness.
Disclosure of Invention
The application provides a pixel circuit and a display panel, which solve the problem of reduction of luminous efficiency caused by uneven light emission of the pixel circuit and aging of devices.
In a first aspect, the present application provides a pixel circuit comprising a drive circuit and an external compensation circuit; the driving circuit at least comprises a light-emitting device and a data line for transmitting a first data signal; the external compensation circuit is connected with the driving circuit, acquires a corresponding real-time sensing value in response to the luminous intensity of the light-emitting device, accumulates a difference value between the real-time sensing value and a preset sensing value to the first data signal to obtain a second data signal, and outputs the second data signal to the data line.
In a first implementation form of the first aspect, the external compensation circuit comprises a sensing unit; the first input end of the sensing unit is connected with a first power line in the driving circuit, and the second input end of the sensing unit is connected with a 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.
In a second implementation form of the first aspect, the sensing unit comprises a photosensitive device and a resistor; the input end of the photosensitive device is connected with a first power line, the output end of the photosensitive device is connected with a first end of a resistor, and a second end of the resistor is connected with a second power line; the first power line is used for accessing a first power signal, the second power line is used for accessing a second power signal, and the potential of the first power signal is higher than that of the second power signal.
In a third implementation form of the first aspect, based on the second implementation form of the first aspect, the photosensitive device is a phototransistor; the first power line is connected with the collector of the phototriode, the emitter of the phototriode is connected with the first end of the resistor, and the grid of the phototriode is used for detecting the luminous intensity of the light-emitting device.
In a fourth embodiment of the first aspect, based on the second embodiment of the first aspect, the photosensitive device is a photodiode; the first power line is connected with the anode of the photosensitive diode, the cathode of the photosensitive diode is connected with the first end of the resistor, and the photosensitive diode is used for detecting the luminous intensity of the light-emitting device.
In a fifth implementation form of the first aspect, according to the second implementation form of the first aspect, the photosensitive device is a photoresistor; the first power line is connected with the first end of the photoresistor, the second end of the photoresistor is connected with the first end of the resistor, and the photoresistor is used for detecting the luminous intensity of the light-emitting device.
In a sixth implementation form of the first aspect, based on the second implementation form of the first aspect, the external compensation circuit further comprises an analog-to-digital conversion unit; the input end of the analog-to-digital conversion unit is connected with the first end of the resistor and used for analog-to-digital conversion of the real-time voltage sensing value.
In a seventh implementation form of the first aspect, based on the second implementation form of the first aspect, the external compensation circuit further comprises a control unit; the control unit is connected with the output end of the analog-to-digital conversion unit and used for calculating the difference value between the real-time sensing value and the preset sensing value and accumulating the difference value to the first data signal to obtain a second data signal.
In a fourth implementation manner of the first aspect, based on the third implementation manner 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 with the control unit, and the output end of the digital-to-analog conversion unit is connected with the data line and used for converting the second data signal in a digital-to-analog mode.
In a second aspect, the present application provides a display panel including the pixel circuit in any of the above embodiments.
The application provides a pixel circuit and display panel, through the luminous intensity of outside compensating circuit based on luminescent device and acquire corresponding real-time sensing value, and accumulate the difference of real-time sensing value and predetermine sensing value to first data signal in order to obtain the second data signal, and output second data signal to the data line, the data signal that can real-time compensation drive circuit access, realize pixel circuit's luminous uniformity, because the real-time compensation that carries out based on luminescent device's luminous intensity rather than the electric current simultaneously, therefore, at the in-process of compensation, the problem that luminous efficiency is low that the device ages and leads to has been compensated simultaneously.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a first structure of a pixel circuit according to an embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a second structure of a pixel circuit according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram of a third structure of a pixel circuit according to an embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a fourth structure of a pixel circuit according to an embodiment of the present disclosure.
Fig. 5 is a timing diagram of a pixel circuit according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 to 5, the present embodiment provides a pixel circuit, which includes a driving circuit 100 and an external compensation circuit 200; the driving circuit 100 has at least 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 driving circuit 100, and is configured to obtain a corresponding real-time sensing value in response to the light emitting intensity of the light emitting device D1, accumulate a difference between the real-time sensing value and a preset sensing value into the first data signal to obtain a second data signal, and output the second data signal to the data line DL.
Note that the sum of the potential of the first data signal and the difference is the potential of the second data signal. In the present embodiment, since the real-time sensing value obtained according to the light emitting intensity of the light emitting device D1 is different from the real-time sensing value obtained by directly inducing a voltage or a current from the pixel circuit in the conventional technical solution, the pixel circuit provided in the present embodiment can compensate the non-uniform light emission and the low light emission efficiency due to the aging of the device, the threshold shift of the driving transistor T1, and other factors.
Wherein, the external compensation circuit 200 includes a sensing unit 10; the first input terminal of the sensing unit 10 is connected to the first power line of the driving circuit 100, and the second input terminal of the sensing unit 10 is connected to the second power line of the driving circuit 100, for obtaining a corresponding real-time voltage sensing value according to the light emitting intensity of the light emitting device D1.
In one embodiment, the sensing unit 10 includes a photosensor and a resistor R; the input end of the photosensitive device is connected with a first power line, the output end of the photosensitive device is connected with a first end of a resistor R, and a second end of the resistor R is connected with a second power line; the first power line is used for accessing a first power signal OVDD, the second power line is used for accessing a second power signal GND, and the potential of the first power signal OVDD is higher than the potential of the second power signal GND.
As shown in fig. 1, in one embodiment, the photosensitive device is a phototransistor T3; the first power line is connected with the collector of the phototransistor T3, the emitter of the phototransistor T3 is connected with the first end of the resistor R, and the gate of the phototransistor T3 is used for detecting the light intensity of the light emitting device D1.
As shown in fig. 2, in one embodiment, the photosensitive device is a photodiode DG; the first power line is connected to an anode of the photodiode DG, a cathode of the photodiode DG is connected to the first end of the resistor R, and the photodiode DG is used for detecting the light intensity of the light emitting device D1.
As shown in fig. 3, in one embodiment, the photosensitive device is a photoresistor RG; the first power line is connected to a first terminal of a photo resistor RG, a second terminal of the photo resistor RG is connected to a first terminal of a resistor R, and the photo resistor RG is used for detecting the light intensity of the light emitting device D1.
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, and is used for analog-to-digital converting the real-time voltage sensing value.
In one embodiment, the external compensation circuit 200 further comprises a control unit 30; the control unit 30 is connected to the output end of the analog-to-digital conversion unit 20, and is configured to calculate a difference between the real-time sensing value and the preset sensing value, and accumulate the difference to the first data signal to obtain a second data signal.
In one embodiment, the external compensation circuit 200 further includes a digital-to-analog conversion unit 40; an input end of the digital-to-analog conversion unit 40 is connected to the control unit 30, and an output end of the digital-to-analog conversion unit 40 is connected to the data line DL for digital-to-analog converting the second data signal.
As shown in fig. 4, in one embodiment, the external compensation circuit 200 further includes a voltage stabilizing capacitor C1; a first end of the voltage-stabilizing capacitor C1 is connected with a first end of the resistor R; a second end of the voltage stabilizing capacitor C1 is connected to the second power signal GND; for stabilizing the potential of the first terminal of the resistor R.
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 end of the addressing unit is used for accessing an addressing signal WR; the input end of the addressing unit is connected with the data line DL and is used for accessing a corresponding data signal data, such as a first data signal or a second 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 used for writing the data signal data into the storage unit according to the addressing signal WR; the first power line is connected with the input end of the driving unit; the output terminal of the driving unit is connected with the second terminal of the storage unit and the anode of the light emitting device D1; the cathode of the light emitting device D1 is connected to a second power supply line.
Wherein the driving unit includes a driving transistor T1; one of the gate/source electrodes of the driving transistor T1 is connected to a first power supply line; the other of the gate/source of the driving transistor T1 is connected to the second terminal of the memory cell and the anode of the light emitting device D1; the gate of the driving transistor T1 is connected to the output terminal of the addressing unit.
The addressing unit includes an addressing transistor T2; one of the gate/source electrodes of the address transistor T2 is connected to the data line DL; the other of the gate/source of the address transistor T2 is connected to the gate of the driving transistor T1; the gate of the address transistor T2 is used to switch in the address signal WR connection.
The storage unit includes a storage capacitor Cst; a first terminal of the storage capacitor Cst is connected to the other of the gate electrode of the driving transistor T1 and the gate/source electrode of the address transistor T2; the second terminal of the storage capacitor Cst is connected to the other of the gate/source electrode of the driving transistor T1 and the anode of the light emitting device D1.
The driving transistor T1 and the addressing unit may be, but not limited to, N-channel thin film transistors, or polysilicon thin film transistors, and may specifically be 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.
As shown in fig. 5, in the specific detection process of the present application, in the detection stage, the first power signal OVDD maintains a high potential, the address signal WR rises from a low potential to a high potential, and the potential of the data signal data jumps from 0 gray scale to 255 gray scale, during the process, the photosensor detects the light emitting intensity of the light emitting device D1, so as to obtain the light emitting current flowing through the light emitting device D1, and after current-voltage conversion, a real-time voltage sensing value corresponding to the light emitting current is obtained, and then compared with the preset voltage sensing value corresponding to the target brightness, if the two values are the same, it is determined that the light emitting efficiency of the light emitting device D1 has not changed; if the two signals are not consistent, it indicates that the light emitting efficiency of the light emitting device D1 has changed, 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 at this time, the data signal data reaching the target brightness has been converted from the first data signal to the second data signal, and the potentials of the two signals at the same time are different, so that the light emitting uniformity and the light emitting efficiency of the light emitting device D1 can be compensated synchronously by the above adjustment.
In one embodiment, the present application provides a display panel including the pixel circuit in any one of the above embodiments.
The display panel may be, but is not limited to, an OLED display panel, which is a display panel made using organic electroluminescent light emitting diodes. The organic electroluminescent diode has the advantages of no need of backlight source, high contrast, thin thickness, wide viewing angle, fast reaction speed, wide application temperature range, simple structure and manufacture process, etc. and is considered as a new application technology of the next generation of flat panel display.
Organic Light Emitting Diode (OLED) displays are becoming more common and are most prominent in products such as mobile phones, media players, and small entry-level televisions. Unlike standard liquid crystal displays, OLED pixels are driven by current sources. To understand how and why the OLED power supply affects the display quality, the OLED display technology and power supply requirements must be understood first. The latest OLED display technologies will be described herein, with major power supply requirements and solutions being discussed, and with the innovative power supply architecture specifically proposed for OLED power supply requirements also being introduced.
The backplane technology creates a flexible display: high resolution color Active Matrix Organic Light Emitting Diode (AMOLED) displays require the use of an active matrix backplane that uses active switching for switching each pixel. Liquid Crystal (LC) displays are well-established in amorphous silicon manufacturing, can be supplied with 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 realize the launch of full color flexible displays. Either standard or soft OLEDs require the same power supply and driving techniques. To understand OLED technology, function, and its interaction with the power supply, the technology itself must be thoroughly analyzed. OLED displays are a self-illuminating display technology that does not require any backlighting at all. The OLED is made of organic materials with applicable chemical structures. OLED technology requires a current-controlled driving method-OLEDs have electrical characteristics that are quite similar to standard Light Emitting Diodes (LEDs), with brightness all depending on the LED current. To turn on and off the OLED and control the OLED current, a control circuit using a Thin Film Transistor (TFT) is required.
The advanced power-save mode achieves maximum efficiency as any battery-powered device can achieve longer battery standby time only when the converter is operating at maximum efficiency for the entire load current range, which is particularly important for OLED displays. OLED displays consume the most power when fully white, and for any other display color the current is relatively small, since only white requires all the red, green and blue subpixels to be fully bright. For example, a 2.7 inch display requires 80mA of current to render a full white image, but only 5mA of current is required to display other icons or graphics. Therefore, the OLED power supply needs to reach high converter efficiency for all load currents. To achieve such efficiency, advanced power-saving mode techniques are required to reduce the load current and thus the switching frequency of the converter. Since this is done through a Voltage Controlled Oscillator (VCO), possible EMI problems can be minimized and the lowest switching frequency can be controlled outside the typical 40kHz audio frequency range, which avoids noise generation by the ceramic input or output capacitance. This is particularly important when using such devices in mobile phone applications, and may simplify the design process.
The white light does not consume the maximum power according to the light emitting characteristics, and the power consumption is determined by the brightness value. For example, red, blue, and green, which are 10 luminance values, together produce 30 luminance values of white light. The red, blue and green brightness values are thus adjusted to 3.3 to give a white value (theoretical value) of 10. The same brightness is seen by the human eye from the LED or OLED, and the blue light is consumed most.
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. Since the color of the light emitted from the OLED depends on the material of the organic light-emitting layer, manufacturers can change the material of the light-emitting layer to obtain the desired color. Active matrix organic light emitting displays have built-in electronic circuitry so that each pixel is independently driven by a corresponding circuit. The OLED has the advantages of simple structure, self-luminescence without a backlight source, high contrast, thin thickness, wide viewing angle, high reaction speed, wide use temperature range and the like, can be used for a flexible panel, provides an optimal mode for browsing photos and videos, and has less limitation on the design of a camera.
The increasing complexity and information density of automotive information systems has led to automotive interior displays that are no longer merely basic centralized instrument displays, but rather meet the increasingly detailed and diversified needs of automotive information displays. The market of vehicle-mounted displays is divided into vehicle-mounted navigation devices, vehicle-mounted televisions and vehicle-mounted information systems according to applications; the method is divided into an original market and a later market according to the assembling time. The original market needs to be strictly authenticated, and the original market is difficult to enter; the after-market does not need certification, which is about 20 times of the original market. With the automobile navigation system and the like becoming automobile standard in the future, the proportion of the new automobile equipped with the display, namely the proportion of the original market, will gradually increase.
The display product that automotive electronics needs to require to environmental suitability height, the performance index of the on-vehicle display screen of general demand is: the brightness is 20-60 nit, the normal-temperature working life is 50000 hours, and the tolerance temperature range is-40-85 ℃. In the north american automobile display market, VFDs (vacuum fluorescent displays) have long been popular because they have excellent brightness to ensure good visibility. However, with the advent of OLED, LCD, and liquid crystal display technologies, VFDs are gradually losing their advantages. Because VFDs are power hungry, full color and resolution are greatly limited.
The LCD technology is gradually applied to the field of vehicle display, but the LCD technology is affected by the ambient temperature, which limits the application field of vehicle display products. The liquid crystal material for manufacturing the liquid crystal display screen can become liquid when the environmental temperature is too high, and can become crystal when the temperature is too low, and no matter what kind of state becomes, the liquid crystal material no longer has the photoelectric effect that can receive electric field control, leads to liquid crystal display screen can not normally work, and the contrast, visual angle, the response speed that the liquid crystal shows in addition also change along with the change of temperature, therefore to the on-vehicle demonstration that environmental change is big, liquid crystal is not good display mode.
Compared with the mature TFT-LCD, the OLED (organic electroluminescence display technology) is an active light-emitting display, and has the advantages of high contrast, wide viewing angle (up to 170 degrees), quick response (about 1 mu s), high light-emitting efficiency, low operating voltage (3-10V), ultra-light weight (the thickness is less than 2mm) and the like. The vehicle-mounted display manufactured by the OLED technology has a lighter, thinner and attractive appearance, more excellent color display image quality, wider viewing range and greater design flexibility, and more importantly, the OLED environmental adaptability is far superior to liquid crystal display, and the tolerable temperature range reaches the temperature range of minus 40-85 ℃. And the OLED does not contain lead, and cannot cause environmental pollution. Therefore, the OLED display has great advantages in the field of vehicles.
Research reports show that, in various applications of the OLED panel, the automobile sound application market accounts for 3% of the total output in 2005, the output value reaches 11%, and the main share of the high-end application market is occupied. In fact, Ford's Aston Martin DB9, Dachernojeep, and Chevrolet Corvette, have employed monochrome OLED small molecule passive matrix displays that can operate for 30000 hours before the brightness drops to 80 [% ] of the original brightness.
OLED displays offer great advantages to automotive manufacturers, who can install automotive dashboard lighting systems quickly without the need to punch through wiring on the car as in the past, and OLED technology can give the premium luxury car the perfect feel that represents a significant savings to the luxury car manufacturers and dealers while providing consumer satisfaction. The service life of the OLED is greatly improved, and the service life of 40000-50000 hours in the conventional environment is equivalent to that of a TFT-LCD. The japanese PiONeer is the earliest commercial manufacturer of OLED products, and single-color OLEDs were applied to car audio as early as 1997, and full-color OLED audio was first introduced in 2004. The working temperature range of the vehicle-mounted display OLED products released by other companies reaches-40-85 ℃, the service life of single-color products reaches 55000 hours (70nit) and 50000 hours (80nit), and the working temperature of vehicle-mounted chips is further improved.
Due to the above advantages, the OLED display screen can be suitably used for POS machines and ATM machines, copying machines, game machines, and the like in the commercial field; the method is applicable to the fields of mobile phones, mobile network terminals and the like in the communication field; the method can be widely applied to PDAs, commercial PCs, household PCs and notebook computers in the field of computers; the product can be used in audio equipment, digital camera, portable DVD; the method is suitable for instruments and meters in the field of industrial application; in the traffic field, the system is used in GPS, airplane instruments and the like.
Flexible screen, refers to flexible OLED. The successful mass production of the flexible screen is not only greatly better than the manufacturing of a new generation of high-end smart phone, but also has a profound influence on the application of wearable equipment due to the characteristics of low power consumption and flexibility, and the flexible screen can be widely applied along with the continuous penetration of a personal intelligent terminal in the future.
The flexible screen mobile phone is a mobile phone with a flexible and good-flexibility screen, and is also called as a awn mobile phone because of being shaped like a awn roll.
OLEDs are thin and can be mounted on flexible materials such as plastic or metal foils. Instead of glass, plastic can make the display more durable and lighter. The flexible OLED panel is concave from top to bottom with a bending radius of 700 mm.
The OLED adopts a plastic substrate instead of a common glass substrate, and a protective film is adhered to the back surface of the panel by means of a thin film packaging technology, so that the panel can be bent and is not easy to break. The flexible screen can be rolled but cannot be folded, future products can be folded, and the appearance can be changed more.
The display screen is cut from the panel. Flexible displays, also known as flexible screens, are seen as a preliminary product of the display screen revolution, with the ultimate goal of turning mobile and wearable electronics around.
The OLED preparation scheme is that the organic functional layer and the cathode layer are prepared by adopting a vacuum evaporation technology, so that expensive evaporation equipment is needed, the production cost is high, and the production efficiency is low. Meanwhile, the preparation of a large-area display screen is difficult to realize due to the size of vacuum evaporation equipment. Compared with vacuum thermal evaporation, the solution method has the advantages of simple operation, low cost and the like, and is suitable for preparing large-size OLED screens at low temperature or room temperature. With the rapid iteration of organic electronic technology, liquid phase processing technology of soluble organic materials is becoming mature, and the preparation of OLEDs by liquid phase methods, especially by printing processes, is considered to be one of the key methods for solving the development bottlenecks of the existing OLEDs.
However, there are some technical difficulties in fabricating the OLED by using the printing process, for example, the solution of the metal electrode on the uppermost layer may cause permeation and damage to the material on the lower layer, which may cause the device to leak current and fail to operate normally. Shanghai power electronics technology Limited is dedicated to the full-printing preparation of OLED displays, and particularly solves the liquid-phase preparation process of upper metal electrodes. After two years of intensive research and development, unique alcohol-system and organic-system electronic transmission layer inks are developed, and when a top electrode is printed or printed, the permeation of electrode solution can be effectively prevented, so that the preparation of a full-printing process is realized. In particular, the full-printing process can realize the luminescence of specific patterns without an evaporation instrument or a customized mask.
In one embodiment, the present application is directed to an OLED flexible display panel and a method for manufacturing the same, in which an inorganic thin film is not easily cracked or peeled; the technical problem that an inorganic film of an OLED flexible display panel is easy to crack or peel in the bending process of the existing OLED flexible display panel is solved.
The OLED flexible display panel comprises: a flexible substrate; the OLED light-emitting structure is arranged 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; a first hybrid layer disposed on the first organic layer and including first inorganic film layers and first split film layers alternately disposed; a second organic layer disposed on the first mixed layer; and a second hybrid layer, disposed on the second organic layer, including a second inorganic film layer and a second split film layer alternately disposed; wherein the first split film layer is an inorganic film layer or an organic film layer with the elastic modulus smaller than that of the first inorganic film layer; the second split film layer is an inorganic film layer or an organic film layer with the elastic modulus smaller than that of the second inorganic film layer.
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 splitting film layer; the length of the second inorganic film layer is greater than the length of the second split film layer.
In the OLED flexible display panel, the projection of the first split film layer on the plane of the flexible substrate and the projection of the second split film layer on the plane of the flexible substrate are staggered.
In the OLED flexible display panel of the present application, an integral inorganic layer is disposed on an OLED light emitting structure by an atomic layer deposition process.
In the OLED flexible display panel of the present application, a first organic layer is disposed on an entire inorganic layer through a coating process or an inkjet printing process;
a second organic layer is disposed on the first hybrid layer by a coating process or an inkjet printing process.
In the OLED flexible display panel, the whole 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 silicon polymer layers; the first inorganic film layer and the second inorganic film layer are aluminum oxide layers, silicon nitride layers, silicon oxide layers or silicon carbide layers.
In the OLED flexible display panel of the present application, the OLED flexible display panel further includes:
and the inorganic protective layer is arranged between the OLED light-emitting structure and the integral inorganic layer.
The embodiment of the invention also provides a manufacturing method of the OLED flexible display panel, which comprises the following steps: providing a flexible substrate; manufacturing an OLED light-emitting structure on a flexible substrate; manufacturing an integral inorganic layer on the flexible substrate through an atomic layer deposition process; manufacturing a first organic layer on a flexible substrate through a coating process or an inkjet printing process; manufacturing a first inorganic film layer on the flexible substrate through a first mask; manufacturing a first split film layer on the flexible substrate through a second mask, so that the first split film layer and the first inorganic film layer form a first mixed layer; disposing a second organic layer on the flexible substrate by a coating process or an inkjet printing process;
manufacturing a second inorganic film layer on the flexible substrate through a third mask; manufacturing a second split film layer on the flexible substrate through a fourth mask, so that the second split film layer and the second inorganic film layer form a second layered mixed layer; wherein the first split film layer is an inorganic film layer or an organic film layer with the elastic modulus smaller than that of the first inorganic film layer; the second split film layer is an inorganic film layer or an organic film layer with the elastic modulus smaller than that of the second inorganic film layer.
In the method for manufacturing the OLED flexible display panel, the length of the first inorganic film layer is greater than that of the first dividing film layer; the length of the second inorganic film layer is greater than the length of the second split film layer.
In the manufacturing method of the OLED flexible display panel, the projection of the first division film layer on the plane of the flexible substrate and the projection of the second division film layer on the plane of the flexible substrate are staggered.
According to the OLED flexible display panel and the manufacturing method thereof, the split inorganic layer and the organic layer are arranged in the laminated structure, so that the inorganic film in the OLED flexible display panel is not easy to crack or peel on the basis of better water and oxygen resistance; the technical problem that an inorganic film of an OLED flexible display panel is easy to crack or peel in the bending process of the existing OLED flexible display panel is solved.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The pixel circuit and the display panel provided in the embodiments of the present application are described in detail above, and a specific example is applied in the description to explain the principle and the implementation of the present application, and the description of the embodiments above is only used to help understanding the technical solutions and the core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A pixel circuit, comprising:
a driving circuit having at least a light emitting device and a data line for transmitting a first data signal; and
the external compensation circuit is connected with the driving circuit, responds to the luminous intensity of the luminous device to obtain a corresponding real-time sensing value, accumulates the difference value of the real-time sensing value and a preset sensing value to the first data signal to obtain a second data signal, and outputs the second data signal to the data line.
2. The pixel circuit according to claim 1, wherein the external compensation circuit comprises a sensing unit;
the first input end of the sensing unit is connected with a first power line in the driving circuit, and the second input end of the sensing unit is connected with a 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.
3. The pixel circuit according to claim 2, wherein the sensing unit comprises a photosensitive device and a resistor;
the input end of the photosensitive device is connected with the first power line, the output end of the photosensitive device is connected with the first end of the resistor, and the second end of the resistor is connected with the second power line;
the first power line is used for accessing a first power signal, the second power line is used for accessing a second power signal, and the potential of the first power signal is higher than that of the second power signal.
4. The pixel circuit according to claim 3, wherein the photosensitive device is a phototransistor;
the first power line is connected with a collector of the phototriode, an emitter of the phototriode is connected with the first end of the resistor, and a grid of the phototriode is used for detecting the luminous intensity of the light-emitting device.
5. The pixel circuit of claim 3, wherein the photosensitive device is a photodiode;
the first power line is connected with the anode of the photosensitive diode, the cathode of the photosensitive diode is connected with the first end of the resistor, and the photosensitive diode is used for detecting the luminous intensity of the light-emitting device.
6. The pixel circuit according to claim 3, wherein the photosensitive device is a photoresistor;
the first power line is connected with a first end of the photoresistor, a second end of the photoresistor is connected with a first end of the resistor, and the photoresistor is used for detecting the luminous intensity of the light-emitting device.
7. The pixel circuit according to claim 3, wherein the external compensation circuit further comprises an analog-to-digital conversion unit;
the input end of the analog-to-digital conversion unit is connected with the first end of the resistor and used for analog-to-digital converting the real-time voltage sensing value.
8. The pixel circuit according to claim 3, wherein the external compensation circuit further comprises a control unit;
the control unit is connected with the output end of the analog-to-digital conversion unit and is used for calculating the difference value between the real-time sensing value and the preset sensing value and accumulating the difference value to the first data signal to obtain a second data signal.
9. The pixel circuit according to claim 4, wherein the external compensation circuit further comprises a digital-to-analog conversion unit;
the input end of the digital-to-analog conversion unit is connected with the control unit, and the output end of the digital-to-analog conversion unit is connected with the data line and used for digital-to-analog conversion of the second data signal.
10. A display panel comprising the pixel circuit according to any one of claims 1 to 9.
Priority Applications (2)
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| CN202011401634.XA CN112365848A (en) | 2020-12-02 | 2020-12-02 | Pixel circuit and display panel |
| PCT/CN2020/138013 WO2022116306A1 (en) | 2020-12-02 | 2020-12-21 | Pixel circuit and display panel |
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| CN202011401634.XA CN112365848A (en) | 2020-12-02 | 2020-12-02 | Pixel circuit and display panel |
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| WO (1) | WO2022116306A1 (en) |
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| 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 |
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