WO2021218500A1

WO2021218500A1 - Organic light emitting diode driving apparatus and control method, and display device

Info

Publication number: WO2021218500A1
Application number: PCT/CN2021/082516
Authority: WO
Inventors: 刘俊彦; 陈英杰; 刘至哲; 韦育伦; 朱家庆
Original assignee: 华为技术有限公司
Priority date: 2020-04-26
Filing date: 2021-03-24
Publication date: 2021-11-04
Also published as: CN113554985A; CN113554985B

Abstract

An organic light emitting diode (OLED) driving apparatus (300, 800), and a control method and apparatus (1100, 1200) for the OLED driving apparatus (300, 800). The OLED driving apparatus (300, 800) comprises a first switching transistor (M6) and a second switching transistor (M5) connected in series; the first switching transistor (M6), the second switching transistor (M5), and an OLED are connected in series; and during a time period that the first switching transistor (M6) is in conducting state, the second switching transistor (M5) is subjected to a plurality of on-off actions to control the light emitting time of the OLED. When the second switching transistor (M5) is subjected to a plurality of on-off actions, the first switching transistor (M6) is in the conducting state, and the number of on-off times of the first switching transistor (M6) is reduced, thereby reducing the number of times of charging a parasitic capacitor at a control end of the first switching transistor (M6) according to a control signal (EM1) of the first switching transistor (M6), and reducing the loss.

Description

Organic light emitting diode driving device, control method and display device

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 202010338073.7, and the application name is "Organic Light Emitting Diode Driving Device, Control Method, and Display Device" on April 26, 2020, the entire content of which is incorporated by reference In this application.

Technical field

This application relates to the field of circuits, in particular to organic light emitting diode driving devices, control methods and display devices.

Background technique

With the development of technology and the gradual improvement of consumption levels, people have higher and higher requirements for the experience of using display devices. Organic light emitting diode (OLED) display devices are widely used. The OLED driving circuit can realize the adjustment of the OLED luminous brightness.

In some OLED driving circuits, two switch tubes connected in series are included in the current path of the OLED. The two switch tubes are controlled by the same control signal and are turned on or off at the same time. As the frequency of the control signal increases, the power consumption generated by the OLED drive circuit increases.

Summary of the invention

The present application provides an OLED driving device, which can reduce the generated power consumption.

In a first aspect, an OLED driving device is provided, which includes a first switch tube and a second switch tube connected in series. The first switch tube, the second switch tube, and the OLED are connected in series; the first switch tube is in conduction. During the time period of the ON state, the second switch tube is used to perform multiple switching actions to control the light-emitting time of the OLED.

By performing multiple switching actions on the second switching tube, the first switching tube is in the ON state, which reduces the number of switching times of the first switching tube, thereby reducing the control signal of the first switching tube as the parasitic control terminal of the first switching tube. The number of times the capacitor is charged reduces loss.

With reference to the first aspect, in some possible implementations, the OLED driving device includes a third switch tube, a fourth switch tube, and a fifth switch tube; the third switch tube is connected to the first switch tube and the second switch tube. The switching tubes are connected in series, the third switching tube is located between the first switching tube and the second switching tube, and the first switching tube or the second switching tube is located between the third switching tube and the second switching tube. Between the OLEDs; the first end of the fourth switch tube is connected to the first end of the third switch tube, and the second end of the fourth switch tube is connected to the control end of the third switch tube; the The first end of the fifth switch tube is connected to the second end of the third switch tube, and the second end of the fifth switch tube is used to receive a data signal.

The OLED driving device may include a third switch tube, and the voltage of the control terminal of the third switch tube can control the current flowing through the OLED, thereby controlling the light-emitting brightness of the OLED. The OLED driving device can realize the threshold voltage compensation of the third switch tube, thereby reducing the residual image.

When the control terminal of the third switch tube receives the data signal, the data signal flows through the third switch tube and is transmitted to the control terminal of the third switch tube. The first switching tube and the second switching tube are turned off when the control terminal of the third switching tube receives the data signal, so as to realize the transmission of the data signal.

With reference to the first aspect, in some possible implementations, in the compensation phase, the first switching tube and the second switching tube are in the off state, and the fourth switching tube and the fifth switching tube are in the conducting state. State; in the light-emitting phase, the fourth switch tube and the fifth switch tube are in the off state; in the light-emitting phase, the first switch tube remains in the on state.

In the light-emitting phase, the first switching tube maintains the on state, the number of times of switching of the first switching tube is further reduced, and the power consumption is reduced.

With reference to the first aspect, in some possible implementation manners, the first switch tube is used to turn on or turn off according to a first control signal, the period of the first control signal is 1/N of the display period, and the display period Including a light-emitting phase and a compensation phase, N is a positive integer; in the compensation phase, the first switching tube and the second switching tube are in the off state, and the fourth switching tube and the fifth switching tube are in the conducting state. In the light-emitting stage, the fourth switch tube and the fifth switch tube are in the off state; in the light-emitting stage and the first switch tube is in the on state, the first switch tube The two switch tubes are used to perform multiple switching actions to control the light-emitting time of the OLED.

By setting the period of the first control signal to 1/N of the display period, the difficulty of designing the first control signal is reduced.

When the period of the first control signal is equal to the display period, the first control signal may be a pulse signal with the same period width. Pulse width can also be called pulse width. The periodic pulse width of the first control signal remains unchanged, which reduces the difficulty of designing the first control signal.

When the display period is equal to an integer multiple of the period of the first control signal, the first control signal may be a pulse signal with the same period width, or a pulse width modulation (PWM) signal.

With reference to the first aspect, in some possible implementations, the first switch tube is used to turn on or off according to a first control signal, the second switch tube is used to turn on or off according to a second control signal, and the The period of the first control signal is a positive integer multiple of the period of the second control signal.

Setting the period of the control signal so that the period of the first control signal is a positive integer multiple of the period of the second control signal can reduce the difficulty of designing the control signal.

With reference to the first aspect, in some possible implementation manners, the second switch tube is configured to be turned on or off according to a second control signal, and the second control signal is a PWM signal.

The second control signal is a PWM signal, and the pulse width of the second control signal can be controlled to control the length of time that the current flows through the OLED, thereby controlling the light-emitting brightness of the OLED.

In a second aspect, a display device is provided, including an OLED and the OLED driving device described in the first aspect.

In a third aspect, a control method of an OLED driving device is provided, the OLED driving device includes a first switch tube and a second switch tube connected in series, and the first switch tube, the second switch tube, and the OLED are connected in series; The method includes: generating a plurality of control signals, the plurality of control signals including a first control signal and a second control signal, the first control signal is used to control the first switch tube, and the second control signal is used to control the The second switch tube; the multiple control signals enable: in the light-emitting stage of the OLED, the first switch tube is in the on-state period of time, the second switch tube performs a switching action to control the OLED Light emitting time; sending the first control signal and the second control signal to the OLED driving device.

With reference to the third aspect, in some possible implementations, the OLED driving device includes a third switch tube, a fourth switch tube, and a fifth switch tube; the third switch tube, the first switch tube, and the The second switching tube is connected in series, the third switching tube is located between the first switching tube and the second switching tube, and the first switching tube or the second switching tube is located at the third switching tube Between the OLED and the OLED; the first end of the fourth switch tube is connected to the first end of the third switch tube, and the second end of the fourth switch tube is connected to the control end of the third switch tube; The first end of the fifth switch tube is connected to the second end of the third switch tube, and the second end of the fifth switch tube is used to receive a data signal.

With reference to the third aspect, in some possible implementation manners, the multiple control signals include a third control signal, and the third control signal is used to control the fourth switch tube and the fifth switch tube; the Multiple control signals enable: in the compensation phase, the first switching tube and the second switching tube are in the off state, and the fourth switching tube and the fifth switching tube are in the on state; in the light-emitting phase, the The fourth switching tube and the fifth switching tube are in an off state; in the light-emitting phase, the first switching tube is kept in an on state.

With reference to the third aspect, in some possible implementation manners, the multiple control signals include a third control signal, and the third control signal is used to control the fourth switch tube and the fifth switch tube; the The period of the first control signal is 1/N of the display period, and the display period includes a light-emitting phase and a compensation phase, and N is a positive integer; the multiple control signals are such that: in the compensation phase, the control signal is used for The first switching tube and the second switching tube are controlled to be in the off state, and the fourth switching tube and the fifth switching tube are controlled to be in the on state; in the light-emitting phase, the control signal is used for The fourth switch tube and the fifth switch tube are controlled to be in the off state; during the light-emitting phase and the first control signal controls the first switch tube to be in the on state, the first switch tube is in the on state. The second control signal is used to control the second switch tube to perform multiple switching actions to control the light-emitting time of the OLED.

With reference to the third aspect, in some possible implementation manners, the period of the first control signal is a positive integer multiple of the period of the second control signal.

With reference to the third aspect, in some possible implementation manners, the second control signal is a PWM signal.

In a fourth aspect, a control device for an OLED driving device is provided, including a memory and a processor; the memory is used to store a program; when the program is executed in the control device, the processor is used to execute the third aspect The method described.

In a fifth aspect, a control device for an OLED driving device is provided, which includes various functional modules for executing the method described in the third aspect.

In a sixth aspect, a display device is provided, which includes the OLED, the OLED driving device, and the control device of the OLED driving device described in the fourth or fifth aspect.

In a seventh aspect, a computer storage medium is provided, the computer-readable storage medium stores program code, and the program code includes instructions for executing the steps in the method in the first aspect or the second aspect.

In an eighth aspect, a chip system is provided. The chip system includes at least one processor. When a program instruction is executed in the at least one processor, the chip system is caused to execute the chip system described in the first aspect or the second aspect. method.

Optionally, as an implementation manner, the chip system may further include a memory in which instructions are stored, and the processor is configured to execute the instructions stored in the memory. When the instructions are executed, the The processor is used to execute the method in the first aspect.

The above-mentioned chip system may specifically be a field programmable gate array FPGA or an application-specific integrated circuit ASIC.

It should be understood that, in this application, the method of the third aspect may specifically refer to the third aspect and the method in any one of the various implementation manners of the third aspect.

Description of the drawings

FIG. 1 is a schematic structural diagram of an OLED driving device.

Figure 2 is a schematic diagram of a control signal.

FIG. 3 is a schematic structural diagram of an OLED driving device provided by an embodiment of the present application.

FIG. 4 is a schematic structural diagram of another OLED driving device provided by an embodiment of the present application.

FIG. 5 is a schematic structural diagram of yet another OLED driving device provided by an embodiment of the present application.

FIG. 6 is a schematic structural diagram of another OLED driving device provided by an embodiment of the present application.

Fig. 7 is a schematic diagram of a control signal provided by an embodiment of the present application.

FIG. 8 is a schematic structural diagram of another OLED driving device provided by an embodiment of the present application.

Fig. 9 is a schematic diagram of another control signal provided by an embodiment of the present application.

FIG. 10 is a schematic flowchart of a control method of an OLED driving device provided by an embodiment of the present application.

FIG. 11 is a schematic structural diagram of a control device of an OLED driving device provided by an embodiment of the present application.

FIG. 12 is a schematic structural diagram of another control device of an OLED driving device provided by an embodiment of the present application.

FIG. 13 is a schematic structural diagram of a display device provided by an embodiment of the present application.

Detailed ways

The technical solution in this application will be described below in conjunction with the accompanying drawings.

Organic light emitting diode (OLED) can also be called organic electro-laser display, organic light-emitting semiconductor, etc. It is a current-type organic light-emitting device, which is a phenomenon that emits light through the injection and recombination of carriers. The luminous intensity is proportional to the injected current. Under the action of an electric field, the holes generated by the anode and the electrons generated by the cathode will move in the OLED, and are injected into the hole transport layer and the electron transport layer respectively, and then migrate to the light emitting layer. When the two meet in the light-emitting layer, energy excitons are generated, which excites the light-emitting molecules and finally produces visible light.

FIG. 1 is a schematic structural diagram of an OLED driving device.

The driving circuit of the OLED includes switch tubes M1 to M7 and a capacitor C.

The switching on and off of the switch tube can be controlled by current or voltage. The switch tube subject to current control can be called a current control switch tube, and the switch tube subject to voltage control can be called a voltage control switch tube or a voltage control switch tube. Each switch tube includes a control end, a first end, and a second end. The control signal received by the control terminal of the switch tube is used to control the switching state of the first terminal and the second terminal of the switch tube. The switch state of the switch tube includes the on state and the off state. The control signal of the current control switch tube is a current signal, that is, the state of the switch tube is controlled by the magnitude of the current flowing through the control terminal. The control signal of the voltage-controlled switch tube is a voltage signal, that is, the state of the switch tube is controlled by the voltage of the control terminal.

The switch tube M4 is a voltage-controlled switch tube. When in the on state, the magnitude of the control signal received by the control terminal of the switch tube can control the maximum current flowing through M4.

Take the switching tubes M1 to M7 as voltage-controlled switching tubes as an example for description.

The switch tubes M6, M4, and M5 are connected in series. The first terminal of M6 is connected to the power supply potential VDD, the second terminal of M6 is connected to the first terminal of M4, the second terminal of M4 is connected to the first terminal of M5, and the second terminal of M5 is connected to the anode of the OLED. The negative electrode of the OLED is connected to the ground potential VSS. The power supply potential VDD and the ground potential VSS are used to provide the voltage difference between the positive and negative electrodes of the OLED.

The first terminal of the capacitor C is connected to the power supply potential VDD, and the second terminal of the capacitor C, the control terminal of the switch tube M4, the first terminal of the switch tube M3, and the first terminal of the switch tube M1 are connected to the node A.

The second end of the switch tube M3 is connected to the second end of the switch tube M4. The second end of the switch tube M1 is connected to the reference potential Vint.

The first terminal of the switch tube M7 is connected to the reference potential Vint, and the second terminal of the switch tube M7 is connected to the node B between the second terminal of the switch tube M4 and the anode of the OLED.

The control signal of the switch tube M2 and the switch tube M3 is N. The control signal of the switching tube M1 and the switching tube M7 is N-1. The control signal of the switching tube M5 and the switching tube M6 is EM.

Take the switch tubes M1 to M7 when the control signals of the switch tubes M1 to M7 are turned on when the control signal is at a low level, and the switching tubes are turned off when the control signal is at a low level as an example for description. The reference potential Vint is low. The waveform diagram of the control signals N, N-1, EM is shown in Figure 2.

In the time period t1, the drive circuit is reset. The time period t1 may also be referred to as the reset phase.

The control signal N-1 is at a low level, and the control signal N and the control signal EM are at a high level. At this time, the switching tube M1 and the switching tube M7 are turned on, and the switching tubes M2, M3, M5, and M6 are turned off.

The switching tube M1 is turned on, so that the potential of the node A is equal to the reference potential Vint, and therefore, the switching tube M4 is turned on.

The voltage difference between the reference potential Vint and the ground potential VSS can turn off the OLED. The switch tube M7 is turned on, and the switch tube M5 is turned off, so that the potential of the node B drops to the reference potential Vint, so that before entering the third stage,

Between the time period t1 and the time period t2, there may or may not be a holding phase. In the time period corresponding to the holding phase, the control signals N-1, N, and EM are all high levels. At this time, the switch tubes, M1, M7, M2, M3, M5, and M6 are all turned off, the capacitor C is equivalent to a short circuit, the potential of the node A remains at the reference potential Vint, and M4 is turned on.

In the time period t2, the data signal Vdata is transmitted to the control terminal of the switch M4. The time period t2 may also be referred to as a compensation phase or a voltage extraction phase.

The control signal N is at a low level, and the control signal N-1 and the control signal EM are at a high level. At this time, the switching tube M2 and the switching tube M3 are turned on, and the switching tubes M1, M7, M5, and M6 are turned off.

The potential of node B remains unchanged and remains the reference potential Vint.

When entering the compensation phase, the switch M4 is turned on, and the data signal Vdata charges the node A. At the beginning of the compensation phase, the potential of node A is the reference potential Vint. Since the switch tube M3 is turned on, the potential of the node A rises. The data signal Vdata is transmitted to the node A through the switch tubes M2, M4, and M3. When the potential difference between the node A and the data signal Vdata Vgs=Vth, M4 is turned off. Among them, Vth is the threshold voltage of M4. The potential of node A is Vdata-Vth.

In the time period t3, the driving circuit controls the OLED to emit light. The time period t3 may also be referred to as the light-emitting phase.

The control signal EM can be at a low level, and the control signal N-1 and the control signal N are at a high level. At this time, the switching tube M5 and the switching tube M6 are turned on, and the switching tubes M1, M7, M2, and M3 are turned off. The voltage across the capacitor C remains unchanged, that is, the potential of the node A remains Vdata-Vth and does not change.

When Vdata-Vth≥Vth, M4 is turned on and the OLED emits light. The potential VB of the node B can be expressed as VB=VSS+Voled. Among them, Voled is the turn-on voltage of the OLED.

When Vdata-Vth<Vth, M4 is turned off and the OLED does not emit light.

The data signal Vdata is an analog signal. Taking the switch tube M4 as a metal oxide semiconductor field effect transistor (MOSFET) as an example, when the switch tube M4 is working in the saturation region, the current flowing through the OLED (that is, the current flowing through the switch tube M4) Isd4 can be expressed as

Among them, μ is the carrier mobility, the control terminal of the switching tube M4 is the gate, C _gi is the gate capacitance per unit area of the switching tube M4, W is the gate width of the switching tube M4, and L is the gate width of the switching tube M4, k is a constant related to process parameters such as the size and material of the switch tube M4.

Therefore, by adjusting the potential of the data signal Vdata, the brightness of the pixel can be obtained.

For the OLED screen, the data signal Vdata is determined according to the data. According to the information that the OLED screen needs to display, the data signal Vdata of each pixel can be the same or different.

In OLED screens, the switch tube is usually implemented by thin film transistors. As a display device, TFT display can be used in various notebook computers, desktop computers and other devices. Each liquid crystal pixel on this type of display is driven by a thin film transistor integrated behind the pixel, so TFT display The screen is also a type of active matrix liquid crystal display device. The TFT display can display screen information at high speed, high brightness and high contrast.

Due to the characteristics of the TFT, as the on-time of the TFT increases, the conductivity of the TFT will decrease. Under prolonged pressure and high temperature, the threshold voltage of TFT will drift. Due to the different display screens, the threshold drift of each part of the TFT of the panel is different, which will cause the difference in display brightness. This difference is related to the previously displayed image. It often appears as an afterimage phenomenon, which is commonly referred to as an afterimage.

In the driving circuit shown in Figure 1, in the compensation stage, the threshold voltage Vth of the switch tube M4 is stored in the gate-source voltage Vgs between the gate and the source (Vgs=Vdata), and finally emits light. At this time, Vgs-Vth is converted into current, because Vgs already contains Vth. When converted into current, the influence of the switch tube Vth on the current flowing through the switch tube can be reduced.

In order to reduce the drift of the threshold voltage Vth of the switching tube M4, the consistency of the current is realized. In the light-emitting phase, the control signal EM can be inverted, so that the switch tubes M6 and M5 are in the off state for part of the light-emitting phase. The tubes M6, M5, and M4 can get a short closing time to restore their own state, and the restored switch tubes M6, M5, and M4 can reduce the afterimage phenomenon.

In addition, in order to adjust the overall brightness of the screen in different environments, pulse width modulation (PWM) can be used to adjust the duty cycle of the control signal EM to control the light-emitting time of the OLED, thereby adjusting the brightness of the OLED. The duty cycle of the control signal EM of the driving circuit of each pixel in the OLED screen is equal.

If the flip frequency of the control signal EM is low during the light-emitting stage (such as using a PWM signal less than or equal to 240 Hertz (Hertz, Hz)), it may make the human eyes perceive the discontinuous light emission of the pixels in the OLED screen, which will cause the flicker of the screen. The phenomenon appears. Flicker, that is, the screen image flickers or flickers. Increasing the flip frequency of the control signal EM will result in an increase in power consumption. The frequency of the control signal EM increases, and the switching frequency of the switching tubes M5 and M6 increases. The switch tube performs the switching action and needs to charge and discharge the parasitic gate capacitance of the switch tube.

Take the switch tubes M5 and M6 as p-channel MOSFET (p-channel MOSFET, PMOS) as an example for description. The substrate of the PMOS is connected to the high level. When the control signal EM is at a low level, the switching tubes M5 and M6 are in a conducting state, that is, the gate voltages of the switching tubes M5 and M6 are low-level voltages. When the control signal EM controls the switching tubes M5 and M6 to turn off, the control signal EM switches from a low level to a high level, and the gate voltages of the switching tubes M5 and M6 increase from a low level voltage to a high level voltage. The gate voltage rises, that is, the gate capacitances of the switch tubes M5 and M6 are charged. Similarly, the control signal EM turns from a high level to a low level. When the switching tubes M5 and M6 are controlled to turn on, the gate voltages of the switching tubes M5 and M6 are reduced from a high-level voltage to a low-level voltage, and the switching tube M5 And the gate capacitance of M6 is discharged. Therefore, in the process of controlling the switching of the switching tubes M5 and M6 by the control signal EM, the gate capacitances of the switching tubes M5 and M6 are charged and discharged, thereby generating power consumption. As the frequency of the control signal EM increases, the charging and discharging speed of the gate capacitance of the switching tubes M5 and M6 increases, and the power consumption increases.

The display period can be understood as the time interval between displaying two consecutive frames of images. That is, the display period may be the display time of one frame of image. Each display period includes a compensation stage, so that the data signal Vdata is transmitted to the switch M4.

Table 1 reflects the relationship between the frequency of the control signal EM in a display period and the power consumption caused by the control signal EM. Among them, the EM power consumption represents the power consumption generated by the control signal EM, and the unit is milliwatts (milli-Watt, mW).

Table 1

EM频率(Hz)EM frequency (Hz)	显示周期中EM脉冲数量Display the number of EM pulses in the cycle	EM功耗(mW)EM power consumption (mW)
240240	44	4.374.37
480480	88	10.1910.19
960960	1616	17.9517.95
19201920	3232	36.5736.57

In order to solve the above problems, an embodiment of the present application provides an OLED driving device.

The OLED driving device provided by the embodiments of the application can be applied to televisions, mobile phones, tablet computers, wearable devices, in-vehicle devices, augmented reality (AR)/virtual reality (VR) devices, notebook computers, and super For electronic devices including OLED display devices, such as ultra-mobile personal computers (UMPC), netbooks, and personal digital assistants (PDAs), the embodiments of the present application do not impose any restrictions on the specific types of electronic devices.

Electronic equipment implements display functions through graphics processing units (GPUs), display screens, and application processors. The GPU is a microprocessor for image processing, connected to the display screen and the application processor. The GPU is used to perform mathematical and geometric calculations and is used for graphics rendering. The processor 110 may include one or more GPUs that execute program instructions to generate or change display information.

The display device can also be called a display screen, which is used to display images, videos, and so on. The display screen includes a display panel. The display panel can adopt liquid crystal display (LCD), organic light-emitting diode (OLED), active matrix organic light-emitting diode or active-matrix organic light-emitting diode (active-matrix organic light-emitting diode). emitting diode, AMOLED), flexible light-emitting diode (flex light-emitting diode, FLED), mini diode (MiniLED), micro diode (Micro LED), micro light emitting diode (Micro-OLED), quantum dot light emitting diode (quantum dot light) emitting diodes, QLED) etc. In some embodiments, the electronic device may include 1 or N display screens, and N is a positive integer greater than 1.

FIG. 3 is an OLED driving device provided by an embodiment of the present application.

The OLED driving device 300 includes a first switch tube and a second switch tube. The first switch tube, the second switch tube, and the OLED are connected in series.

It should be understood that the OLED driving device 300 may be located between the anode of the OLED and the power source VDD, that is, the first switch tube and the second switch tube may both be located between the OLED and the power source VDD. The OLED driving device 300 may also be located between the negative electrode of the OLED and the ground VSS, that is, the first switch tube and the second switch tube may both be located between the OLED and the ground VSS. Alternatively, the OLED may be located between the first switch tube and the second switch tube.

FIG. 3 illustrates an example in which the first switch tube and the second switch tube are both located between the OLED and the power supply VDD. The first switching tube may be any one of the switching tube M5 and the switching tube M6, and the second switching tube is the other switching tube of the switching tube M5 and the switching tube M6.

The control signal can be transmitted to the control end of the switching tube to control the switching on or off. The control signal of the first switch tube is the first control signal, and the first switch tube is used to turn on or turn off according to the first control signal. The control signal of the second switch tube is the second control signal, and the second switch tube is turned on or off according to the second control signal. The control signal of the switching tube M6 is EM1, and the control signal of the switching tube M5 is EM2.

During the time period when the first switch tube is in the on state, the second switch tube is used to perform a switching action to control the light-emitting time of the OLED.

That is to say, the first control signal controls the first switching tube to be in the on state during the time period, and the second control signal controls the second switching tube to perform multiple switching actions.

The switch tube in the OLED driving device 300 may be a MOSFET or other types of transistors, for example, all or part of it may be an n-channel MOSFET (n-channel MOSFET, NMOS) or PMOS. In FIG. 3, the first switch tube and the second switch tube are PMOS as an example for description.

When the first switching tube is turned on, the second switching tube can perform a switching action or maintain the on or off state. The switch tube performs a switching action, that is, a conversion between an on-state and an off-state. One switching action can be a switch on, that is, a switch from a cut-off state to a switch on state, or it can be a switch off action, and a switch from a switch on state to a switch on state.

If the first switching tube and the second switching tube are turned on at the same time, the second switching tube performs multiple switching actions during the time period when the first switching tube is in the on state, so that current can flow through the OLED multiple times.

If the second switching tube remains off when the first switching tube is turned on, the second switching tube performs more than 3 switching actions during the time period when the first switching tube is in the on state, which can make the current flow through the OLED multiple times .

During the period from when the first switching tube is turned on to when the first switching tube is turned off, the parasitic capacitance of the control terminal of the first switching tube is charged and discharged once, and the parasitic capacitance of the control terminal of the second switching tube is charged and discharged multiple times. Compared with the case where the first switch tube and the second switch tube are controlled by the same control signal and turned on and turned off at the same time, the number of times of charging and discharging the parasitic capacitance of the control terminal of the first switch tube is reduced.

The first control signal and the second control signal may be periodic signals. It is possible to set different switching frequencies for the first switching tube and the second switching tube control signal on the OLED current loop. When the first switching tube is in the on state, the second switching tube performs multiple switching actions, thereby reducing the first switching. The number of charging and discharging of the parasitic capacitance at the control end of the tube reduces losses.

The OLED driving device 300 provided in the embodiment of the present application may be used to implement threshold voltage compensation or other functions.

As shown in FIG. 4, the OLED driving device 300 may further include a switch tube M4 and a switch tube M3. One of the switching tube M5 and the switching tube M6 is the first switching tube, and the other is the second switching tube.

The switching tube M4 is connected in series with the first switching tube and the second switching tube. The switching tube M4 is located between the first switching tube and the second switching tube. The first switching tube or the second switching tube is located between the switching tube M4 and the OLED. between.

As shown in Figure 4, the switch tube M5 is located between the switch tube M4 and the OLED. The switching tube M5 is the first switching tube or the second switching tube.

The switching tube M3 is located between the first end of the switching tube M4 and the control terminal of the switching tube M4. As shown in FIG. 4, the first end of the switch tube M4 may be an end where the switch tube M4 and the switch tube M5 are connected. Or, as shown in FIG. 5, the first end of the switching tube M4 may also be an end connecting the switching tube M4 and the switching tube M6.

In the compensation stage when the control terminal of the switch M4 receives the data signal Vdata, the switch M6 and the switch M5 are in the off state, the switch M3 is in the on state, and the data signal Vdata is transmitted to the switch through the switch M4 and the switch M3. Control end of tube M4. The compensation phase is the time period outside the light-emitting phase.

The data signal Vdata is transmitted to the control terminal of the switch M4 through the switch M4, that is, when the data signal Vdata is transmitted to the control terminal of the switch M4, the signal line used to transmit the data signal Vdata and the control terminal of the switch M4 are two places The current passing through the switch tube M4 is transmitted.

That is to say, in the compensation stage, the switch tube M3 is in the conducting phase, that is, the first terminal of the switch tube M4 is connected to the control terminal of the switch tube M4, and the data signal Vdata is transmitted to the switch tube M4 through the second terminal of the switch tube M4. The first terminal is transmitted to the control terminal of the switch tube M4.

At the beginning of the compensation phase, the switch M4 is turned on.

In the compensation phase, the first switching tube and the second switching tube are in the off state, so that the switching tube M4 is disconnected from the power supply VDD and the ground VSS, and the data signal Vdata is transmitted to the switching tube M4 through the switching tube M4. Control terminal. After the compensation stage, the voltage of the control terminal of M4 is Vgs=Vdada-Vth, where Vth is the threshold voltage of the switch tube M4.

That is to say, the first switching tube M6 and the second switching tube M5 are used to disconnect the switching tube M4 from the power supply VDD and ground VSS during the compensation phase, and the data signal Vdata is transmitted to the switching tube M4 through the switching tube M4. To form a compensation for the threshold voltage Vth of the switch tube M4.

The switching tube M5 can be used as the first switching tube, and the switching tube M6 can be used as the second switching tube. The power supply VDD and the data signal Vdata provide current for the OLED.

In order to avoid the mutual influence between the voltage value of each node on the loop where the OLED is located in the light-emitting phase and the data signal Vdata, the OLED driving device 300 may further include a switch tube M2. One of the switching tube M5 and the switching tube M6 is the first switching tube, and the other switching tube is the second switching tube.

The first terminal of the switch tube M2 is used to receive the data signal Vdata. In other words, the first end of the switch tube M2 is connected to the transmission line of the data signal Vdata. The second end of the switch tube M2 is connected to the second end of the switch tube M4. As shown in Fig. 4, the second end of the switching tube M4 is connected to the switching tube M6. As shown in Figure 5, the second end of the switching tube M4 is connected to the switching tube M5.

In the compensation phase, the switch tube M2 is in a conducting state, so that the data signal Vdata is transmitted to the second end of the switch tube M4.

In the light-emitting phase, the switch tube M2 is in an off state to disconnect the data line for transmitting the data signal Vdata and the second end of the switch tube M4.

Therefore, in the light-emitting phase, the control terminal of the switch tube M4 is disconnected from the switch tube M5, and the second terminal of the switch tube M4 is disconnected from the transmission line of the data signal Vdata, so that the switch tube M6, the switch tube M5, and the switch tube M4 control the OLED brightness.

The switch tube M4 controls the current through the voltage of the control terminal, thereby controlling the current when the current flows through the OLED. The control signal EM1 controls the on-time of the switching tube M6, and the control signal EM2 controls the on-time of the switching tube M5, thereby controlling the time for the current to flow through the OLED, thereby controlling the light-emitting time of the OLED.

After the compensation phase, you can go through or through the hold phase to enter the light-emitting phase. In the holding phase, the switching tubes M5, M6, M2, and M3 are all in the cut-off state, and the voltage of the control terminal of the switching tube M4 remains unchanged.

When entering the light-emitting phase or before entering the light-emitting phase, the first control signal can control the first switch tube to turn on. In the light-emitting phase, the first control signal may or may not include a cut-off signal for controlling the first switch tube to be in the cut-off state. That is to say, in the light-emitting phase, the first switch tube may always be in a conducting state, or the first switch tube may also perform a switching action.

In the light-emitting phase, when the first switch tube is in the on state, the second switch tube can perform multiple switching actions to control the light-emitting time of the OLED.

When the first switching tube is in the cut-off state, the second switching tube can perform switching operations.

Or, in the light-emitting stage, when the first switch tube is in the off state, the second control signal may maintain the on state or the off state. The second switching tube is in the on state or the off state, which can reduce the number of times of charging and discharging the parasitic capacitance of the control terminal of the second switching tube, and further reduce the loss.

In addition, when the first switch tube is in the cut-off state, the second switch tube is controlled to be in the cut-off state, so that one of the first switch tube and the second switch tube that should be in the cut-off state can be turned over incorrectly and enter the conduction state. In the state, the other switch tube is in the off state, thereby preventing the OLED from emitting light and improving the reliability of the OLED driving device 300.

To facilitate the design of the first control signal, the first control signal may be a periodic signal. For example, the period T1 of the first control signal may be 1/N of the display period, the display period includes the light-emitting phase and the compensation phase, and N is a positive integer.

The OLED driving device provided by the embodiment of the present application can be applied to a display device. When the display device displays a picture, the display period can be understood as the time interval between displaying two consecutive frames of images. That is, the display period may be the display time of one frame of image.

To facilitate the design of the second control signal, the second control signal may be a periodic signal. The display period may be a positive integer multiple of the period T2 of the second control signal. Further, the period of the first control signal may be a positive integer multiple of the period of the second control signal.

The first control signal and/or the second control signal may be a PWM signal.

PWM is an effective technology that uses the digital output of the processor to control the analog circuit. By adjusting the length of the on-time of the switching tube, the average voltage or average current of the switching tube is adjusted. Through the width of the PWM signal, the on-time of the switch tube can be controlled, and the light-emitting time of the OLED can be controlled, thereby adjusting the light-emitting brightness of the OLED.

A plurality of OLED driving devices may be included in the display device. The control signals of multiple OLED driving devices may be the same. In some cases, the overall brightness of the screen is adjusted according to environmental brightness and/or user settings. The pulse width of the first control signal and/or the second control signal can be controlled, so that the light-emitting brightness of multiple OLEDs in the display device can be uniformly adjusted.

In the light-emitting phase, the second control signal may be a periodic signal. The second control signal can be reversed regardless of the state of the first switch, which reduces the difficulty of designing the second control signal. The period of the second control signal is less than the time of the light-emitting phase. In general, the time of the light-emitting phase is equal to a positive integer multiple of the period of the second control signal. Equal to can also be understood as approximately equal to.

In the light-emitting phase, the first control signal may include a turn-on signal that the controlled first switch tube is in the on state and an off signal that the controlled first switch tube is in the off state, see FIG. 9. That is to say, in the light-emitting phase, the first control signal can be used to control the first switching tube to flip, and the first switching tube is in the on state for a part of the time period, and is in the off state for a part of the time period.

When the display periods are equal, the first control signal may be a periodic signal to meet the requirements of the display period. The period T1 of the first control signal may be 1/N of the display period.

When the period of the first control signal is equal to the display period, the pulse width of the first control signal in each period may be equal.

When the period T1 of the first control signal may be 1/N of the display period, and N is greater than or equal to 2, the first control signal may be a pulse signal with a constant pulse width or a PWM signal.

When the first control signal is a pulse signal with a constant pulse width, the second pulse signal may be a PWM signal, and the light-emitting time of the OLED can be adjusted by adjusting the pulse width of the second pulse signal.

When the first control signal is a PWM signal, the second pulse signal has a pulse signal with a constant pulse width, and may also be a PWM signal. By adjusting the pulse width of the first control signal, the light-emitting time of the OLED can be adjusted.

Preferably, both the first control signal and the second control signal are PWM signals to increase the flexibility of the adjustment method.

Or, in the light-emitting phase, the first control signal can control the first switch tube to maintain the on state, see FIG. 7. That is to say, in the light-emitting stage, the first switch tube can always be in the on state.

In the light-emitting phase, the first switch tube remains in the on state, which can further reduce the number of charging and discharging times for the parasitic capacitance of the control terminal of the first switch tube, thereby reducing power consumption.

The control signal EM1 and the control signal EM2 may be PWM signals.

In the light-emitting phase, the control terminal voltage of the switch tube M4 needs to be stable. Therefore, a capacitor can be set at the control end of the switch tube M4.

The second terminal of the capacitor C is connected to the control terminal of the switch tube M4. The first end of the capacitor C can be connected to the power supply VDD, as shown in FIG. 6. The first terminal of the capacitor C can also be connected to the anode of the OLED, as shown in FIG. 8. Alternatively, the first end of the capacitor C may also be connected to other positions, which is not specifically limited in the embodiment of the present application.

In the compensation stage, the capacitor C needs to be charged or discharged, and the data signal Vdata has been transmitted to the control terminal of M4, which is held by the capacitor C. It takes time to charge and discharge the capacitor C. Therefore, the time length of the compensation phase can be longer than the time for the second switch tube to perform a switching action to achieve one turn-on or turn-off.

In some cases, the previous data signal Vdata may cause the switch tube M4 to be in an off state. Therefore, in order to enable the current data signal Vdata to be transmitted to the control terminal of the switch tube M4, before the compensation stage, the switch tube M4 can be The voltage of the control terminal is adjusted so that the switch tube M4 is in the conducting state at the beginning of the compensation phase.

In addition, before the compensation stage, the voltage of the control terminal of the switch tube M4 is adjusted, so that the switch tube M4 can pass a larger current at the beginning of the compensation stage, so that the data signal Vdata can be quickly transmitted to the control of the switch tube M4 end.

Before the compensation stage, the adjustment that can be performed on the control terminal voltage of the switch tube M4 can be referred to as resetting the control terminal of the switch tube M4. The time period during which the voltage of the control terminal of the switch tube M4 is adjusted can be referred to as the reset phase. For details, please refer to the description of Fig. 6 to Fig. 8.

FIG. 6 is a schematic structural diagram of an OLED driving device provided by an embodiment of the present application. Take the switch tubes M1 to M7 as PMOS as an example for description.

Compared with the OLED driving device shown in FIG. 1, the switch tube M5 and the switch tube M6 are no longer controlled by the same control signal, but are controlled by different control signals. The switch tube M6 is controlled by the control signal EM1, and the switch tube M5 is controlled by the control signal EM2.

The switch tubes M6, M4, and M5 are connected in series. The first terminal of M6 is connected to the power supply potential VDD, the second terminal of M6 is connected to the second terminal of M4, the first terminal of M4 is connected to the first terminal of M5, and the second terminal of M5 is connected to the anode of the OLED. The negative electrode of the OLED is connected to the ground potential VSS. The power supply potential VDD and the ground potential VSS are used to provide the voltage difference between the positive and negative electrodes of the OLED.

The first end of the switch tube M3 is connected to the control end of the switch tube M4, and the second end of the switch tube M3 is connected to the first end of the switch tube M4.

The first terminal of the switch tube M2 is used to receive the data signal Vdata, and the first terminal of the switch tube M2 is connected to the second terminal of the switch tube M4.

The first end of the capacitor C is connected to the power supply potential VDD, and the second end of the capacitor C, the control end of the switch tube M4, and the first end of the switch tube M3 are connected to the node A. In the light-emitting phase, the capacitor C is used to maintain the voltage of the control terminal of the switch tube M4.

In order to make the switch tube M4 in the on state before the compensation stage, the OLED driving device may include the switch tube M1. The first terminal of the switch tube M1 is connected to the node A, and the second terminal of the switch tube M1 is connected to the reference potential Vint.

In the reset stage before the compensation stage, the control terminal of the switch tube M4 can be connected to the reference potential Vint, so that the switch tube M4 is in a conducting state before the compensation stage.

Before the compensation phase, a reset phase can be set. In the reset phase, the switch tube M1 is in a conducting state. So that the reference potential Vint is transmitted to the control terminal of the switch tube M4. The reference potential Vint can control the switch tube M4 to be in a conducting state.

The OLED driving device may also include a switch tube M7. The first terminal of the switch tube M1 is connected to the node B between the second terminal of the switch tube M4 and the OLED, and the second terminal of the switch tube M7 is connected to the reference potential Vint. The reference potential Vint can turn off the OLED. In the light-emitting stage, the switch tube M7 is in the off state, and in the reset stage and/or the compensation stage, the switch tube M7 is in the on state.

According to the types of the switching tube M2 and the switching tube M3, the control signals of the switching tube M2 and the switching tube M3 can be the same or different. When the switching tube M2 and the switching tube M3 are both NMOS or PMOS, the switching tube M2 and the switching tube M3 can be controlled by the same control signal N.

According to the type of the switching tube M1 and the switching tube M7, the control signals of the switching tube M1 and the switching tube M7 can be the same or different. When the switching tube M1 and the switching tube M7 are both NMOS or PMOS, the switching tube M1 and the switching tube M7 can be controlled by the same control signal N-1.

FIG. 7 takes the switch tube M1 to the switch tube M7 as an example for description. The waveform diagrams of the control signals N, N-1, EM1, EM2 are shown in Figure 7.

The control signal N-1 is at a low level, and the control signals N, EM1, and EM2 are at a high level. At this time, the switching tube M1 and the switching tube M7 are turned on, and the switching tubes M2, M3, M5, and M6 are turned off.

The voltage difference between the reference potential Vint and the ground potential VSS can turn off the OLED. The switching tube M7 is turned on, the switching tube M5 is turned off, and the potential of the node B drops to the reference potential Vint, so that when the switching tube M4 enters the light-emitting phase, a relatively large current can flow.

Between the time period t1 and the time period t2, there may or may not be a holding phase. In the time period corresponding to the hold phase, the control signals N-1, N, EM1, EM2 are all high levels. At this time, the switch tubes, M1, M7, M2, M3, M5, and M6 are all turned off, the capacitor C is equivalent to a short circuit, the potential of the node A remains at the reference potential Vint, and M4 is turned on.

The control signal N is low level, and the control signals N-1, EM1, EM2 are high level. At this time, the switching tube M2 and the switching tube M3 are turned on, and the switching tubes M1, M7, M5, and M6 are turned off.

When entering the compensation phase, the switch M4 is turned on, and the data signal Vdata is transmitted to the node A. At the beginning of the compensation phase, the potential of node A is the reference potential Vint. Since the switch tube M3 is turned on, the potential of the node A rises. The data signal Vdata is transmitted to the node A through the switch tubes M2, M4, and M3. When the potential difference between the node A and the data signal Vdata drops to Vth, M4 is turned off. Among them, Vth is the threshold voltage of M4. The potential of node A is Vdata-Vth.

The control signals N-1 and N are high level, and the switch tubes M2, M3, M8, and M9 are turned off. When the control signal EM1 and the control signal EM2 are both at a high level, that is, when the switch tubes M5 and M6 are both in a conducting state, current flows through the OLED, and the OLED emits light. The control terminal voltage of the switch tube M4 is Vdata-Vth, which controls the magnitude of the current flowing through the switch tube M4, that is, through the OLED.

One of the switch tube M5 and the switch tube M6 is the first switch tube, and the other switch tube is the second switch tube. In the light-emitting phase, during the time period when the first switch tube is in the on state, the second switch tube is used to perform a switching action to control the light-emitting time of the OLED.

The first control signal may be a periodic signal to reduce the difficulty of designing the first control signal. The first control signal may be a periodic signal with a fixed width, or may also be a PWM signal.

The display cycle includes a reset phase, a compensation phase, and a light-emitting phase. The display period may be equal to a positive integer multiple of the period T1 of the first control signal. As shown in FIG. 9, the display period may be equal to the period T1 of the first control signal. It should be understood that equal can also be approximately equal.

The second control signal may be PWM. By adjusting the width of the pulse signal, the length of the light-emitting time of the OLED can be adjusted, thereby controlling the light-emitting brightness of the OLED.

The period T1 of the first control signal is greater than the period T2 of the second control signal, so that the frequency of charging and discharging the parasitic capacitance of the second switch tube is reduced, and the power consumption of the system is reduced.

For ease of design, the period T1 of the first control signal may be a positive integer multiple of the period T2 of the second control signal.

FIG. 8 is a schematic structural diagram of an OLED driving device provided by an embodiment of the present application. In the OLED driving device 800, the switch transistors M1-M7 are all NMOS transistors as an example for description. When the control terminal of the NMOS tube receives a high-level signal, the NMOS tube is in a conducting state. When the control terminal of the NMOS tube receives a low-level signal, the NMOS tube is in an off state.

The switch tubes M6, M4, and M5 are connected in series. The first terminal of the switching tube M6 is connected to the power supply potential VDD, the second terminal of the switching tube M6 is connected to the second terminal of the switching tube M4, the first terminal of the switching tube M4 is connected to the first terminal of the switching tube M5, and the switching tube M5 Connect the second end of the OLED to the anode of the OLED. The negative electrode of the OLED is connected to the ground potential VSS. The power supply potential VDD and the ground potential VSS are used to provide the voltage difference between the positive and negative electrodes of the OLED.

The first terminal of the switch tube M2 is used to receive the data signal Vdata, that is, the first terminal of the switch tube M2 is connected to the transmission line of the data signal Vdata. The first end of the switch tube M2 is connected to the second end of the switch tube M4.

The second terminal of the capacitor C, the control terminal of the switch tube M4, and the first terminal of the switch tube M3 are connected to the node A. The first terminal of the capacitor C, the switch tube M5, and the anode of the OLED are connected to the node B. In the light-emitting phase, the capacitor C is used to maintain the voltage of the control terminal of the switch tube M4.

In order to make the switch tube M4 in the on state before the compensation stage, the OLED driving device may include the switch tube M8. The first terminal of the switch tube M8 is connected to the power supply potential VDD, and the second terminal of the switch tube M8 is connected to the node A.

In the reset stage before the compensation stage, the control terminal of the switch tube M4 can be connected to the power supply potential VDD, so that the switch tube M4 is in a conducting state before the compensation stage.

Before the compensation phase, a reset phase can be set. In the reset phase, the switch tube M8 is in a conducting state. So that the power supply potential VDD is transmitted to the control terminal of the switch tube M4. The power supply potential VDD can control the switch tube M4 to be in a conducting state.

The OLED driving device may also include a switch tube M9. The first terminal of the switch tube M9 is connected to the node B between the second terminal of the switch tube M4 and the anode of the OLED, and the second terminal of the switch tube M9 is connected to the reference potential Vint. The reference potential Vint can turn off the OLED. The switch tube M9 is in the off state during the light-emitting phase, and is in the on state during the reset phase and/or the compensation phase.

The control terminals of the switching tube M2, the switching tube M3, and the switching tube M9 can be used to receive the control signal P. The control terminal of the switch tube M8 can be used to receive the control signal P-1.

The waveform diagrams of the control signals P, P-1, EM1, EM2 are shown in Figure 9.

In the time period t1, that is, the reset stage, the control signal P-1 is at a high level, and the control signals P, EM1, and EM2 are at a low level. At this time, the switching tube M8 is turned on, and the switching tube M2, M3, M5, M6, and M9 are turned off.

The switching tube M8 is turned on, so that the potential of the node A is equal to the power supply potential VDD, and therefore, the switching tube M4 is turned on.

Between the time period t1 and the time period t2, there may or may not be a holding phase. In the time period corresponding to the holding phase, the control signals P-1, P, EM1, and EM2 are all low level. At this time, the switch tubes M2, M3, M5, M6, M8, and M9 are all off, both ends of the capacitor C are equivalent to open circuit, the potential of the node A remains at the power supply potential VDD, and the switch tube M4 is turned on.

In the time period t2, that is, the compensation stage, the data signal Vdata is transmitted to the control terminal of the switch M4.

The control signal P is at a high level, and the control signals P-1, EM1, and EM2 are at a high level. At this time, the switching tube M2 and the switching tube M3 are turned on, and the switching tubes M5 and M6 are turned off.

The switch tube M9 is turned on, and the potential of the node B is the reference potential Vint.

When entering the compensation phase, the switch M4 is turned on, and the data signal Vdata is transmitted to the node A. At the beginning of the compensation phase, the potential of node A is the reference potential VDD. Since the switch tube M3 is turned on, the potential of the node A rises. The data signal Vdata is transmitted to the node A through the switch tubes M2, M4, and M3. When the potential difference Vgs between the node A and the data signal Vdata=Vth, the switch M4 is turned off. Among them, Vth is the threshold voltage of M4. When the switch M4 is turned off, the potential of the node A is Vdata-Vth.

In the time period t3, that is, the light-emitting phase, the OLED driving device drives the OLED to emit light.

The control signals EM1 and EM2 are at a high level, and the control signals P-1 and P are at a low level. The switching tubes M5 and M6 are turned on, the switching tubes M2, M3, M8, and M9 are turned off, and the control terminal voltage of the switching tube M4 is Vdata-Vth, which controls the magnitude of the current flowing through the switching tube M4, that is, through the OLED.

With the OLED driving device provided by the embodiments of the present application, power consumption can be reduced.

Table 2 reflects the relationship between the frequency of the control signals EM1 and EM2 and the power consumption caused by the control signal. The switching tube M5 and the switching tube M6 are both MOSFETs with a width-to-length ratio of W/L (unit: micrometer (μm)). Ref represents the reference value.

Table 2

According to the power calculation formula, the power consumption generated by charging the parasitic capacitance of the control terminal of the MOSFET each time is

P=f·Cgs·V ²

Among them, f represents the control signal frequency at the control end of the MOSFET, Cgs represents the parasitic capacitance at the control end of the MOSFET, and V represents the voltage of the control signal at the control end of the MOSFET.

When the switching tube M5 and the switching tube M6 are controlled by the same control signal EM with a frequency of 960 Hz, the power consumption generated by the control signal EM is P1=2×960×Cgs·V ² .

When one of the switching tube M5 and the switching tube M6 is controlled by the first control signal with a frequency of 960 Hz, and the other switching tube is controlled by the second control signal with a frequency of 240 Hz, the power generated by the first control signal and the second control signal The power consumption is P2=960×Cgs·V ² +240×Cgs·V ² , and the power consumption is reduced by 37.5%.

The OLED driving device includes a first switch tube and a second switch tube connected in series, and the first switch tube, the second switch tube, and the OLED are connected in series.

In step S1001, a plurality of control signals are generated.

The plurality of control signals includes a first control signal and a second control signal.

The first control signal is used to control the first switch tube, and the second control signal is used to control the second switch tube.

The multiple control signals enable the first control signal to control the first switch tube to be in the on state during the time period, and the second control signal to control the second switch tube to perform multiple switching actions to control the light-emitting time of the OLED.

In step S1002, a control signal is sent to the OLED driving device.

Optionally, the OLED driving device includes a third switch tube, a fourth switch tube, and a fifth switch tube.

The third switching tube is connected in series with the first switching tube and the second switching tube, the third switching tube is located between the first switching tube and the second switching tube, and the first switching tube is The switch tube or the second switch tube is located between the third switch tube and the OLED.

The first end of the fourth switch tube is connected to the first end of the third switch tube, and the second end of the fourth switch tube is connected to the control end of the third switch tube.

The first end of the fifth switch tube is connected to the second end of the third switch tube, and the second end of the fifth switch tube is used to receive a data signal.

Optionally, the multiple control signals include a third control signal, and the third control signal is used to control the fourth switch tube and the fifth switch tube.

The multiple control signals enable: in the compensation phase, the first switching tube and the second switching tube are in the off state, and the fourth switching tube and the fifth switching tube are in the on state; in the light-emitting phase , The fourth switching tube and the fifth switching tube are in an off state; in the light-emitting phase, the first switching tube is kept in an on state.

The period of the first control signal is 1/N of the display period, and the display period includes a light-emitting phase and a compensation phase, and N is a positive integer.

In the compensation phase, the control signal is used to control the first switching tube and the second switching tube to be in an off state, and to control the fourth switching tube and the fifth switching tube to be in an on state.

In the light-emitting phase, the control signal is used to control the fourth switch tube and the fifth switch tube to be in an off state.

In the light-emitting phase and the first control signal controls the first switching tube to be in the on state, the second control signal is used to control the second switching tube to perform multiple switching actions to control The light-emitting time of the OLED.

Optionally, the period of the first control signal is a positive integer multiple of the period of the second control signal.

Optionally, the second control signal is a PWM signal.

The control device 1100 includes a generating module 1101 and a sending module 1102.

The generating module 1101 is used to generate control signals.

The sending module 1102 is used to send a control signal to the OLED driving device.

The control signal includes a first control signal and a second control signal.

The control signal enables the first control signal to control the first switch tube to be in the on state during the time period, and the second control signal to control the second switch tube to perform multiple switching actions to control the light-emitting time of the OLED.

Optionally, the second control signal is a PWM signal.

FIG. 12 is a schematic structural diagram of a control device of an OLED driving device provided by an embodiment of the present application.

The control device 1200 includes a processor 1201 and a communication interface 1202.

The communication interface 1202 is used to exchange information between the control device 1200 and the OLED driving device. When the program instructions are executed in the processor 1201, the control device 1200 executes the method described above.

The processor 1201 is configured to generate a plurality of control signals, the plurality of control signals include a first control signal and a second control signal, the first control signal is used to control the first switch tube, and the second control signal is used to control the The second switch tube,

The communication interface 1202 is used to send the control signal to the OLED driving device.

Optionally, the second control signal is a PWM signal. FIG. 13 is a display device provided by an embodiment of the present application. The display device includes a control device of an OLED driving device and a plurality of OLED cells. Each OLED unit includes an OLED driving device and an OLED driven by the OLED driving device. The control device of the OLED driving device may be a gate driver on array (GOA).

Multiple OLEDs form an array, and GOA is used to generate control signals for each row of OLEDs in the display device corresponding to the display screen.

In this array, each OLED unit inputs the same reference signal Vint. The input Vdata of each OLED unit can be the same or different.

The power consumption generated by the control signal may also be referred to as panel power.

An embodiment of the present application also provides a display device, including the OLED and OLED driving device described above.

An embodiment of the present application also provides a display device, including the OLED, an OLED driving device, and a control device of the OLED driving device described above.

An embodiment of the present application further provides a computer program storage medium, which is characterized in that the computer program storage medium has program instructions, and when the program instructions are directly or indirectly executed, the foregoing method can be realized.

An embodiment of the present application further provides a chip system, wherein the chip system includes at least one processor, and when the program instructions are executed in the at least one processor, the foregoing method can be realized.

A person of ordinary skill in the art may realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

An organic light emitting diode OLED driving device, characterized in that it comprises a first switch tube and a second switch tube connected in series, and the first switch tube, the second switch tube, and the OLED are connected in series;

During the time period when the first switch tube is in the on state, the second switch tube is used to perform multiple switching actions to control the light-emitting time of the OLED.
The OLED driving device according to claim 1, characterized in that it comprises a third switch tube, a fourth switch tube, and a fifth switch tube;

The third switching tube is connected in series with the first switching tube and the second switching tube, the third switching tube is located between the first switching tube and the second switching tube, and the first switching tube is The switch tube or the second switch tube is located between the third switch tube and the OLED;

The first end of the fourth switch tube is connected to the first end of the third switch tube, and the second end of the fourth switch tube is connected to the control end of the third switch tube;

The first end of the fifth switch tube is connected to the second end of the third switch tube, and the second end of the fifth switch tube is used to receive a data signal.
The OLED driving device according to claim 2, wherein:

In the compensation phase, the first switching tube and the second switching tube are in an off state, and the fourth switching tube and the fifth switching tube are in an on state;

In the light-emitting phase, the fourth switch tube and the fifth switch tube are in an off state;

In the light-emitting phase, the first switch tube maintains a conducting state.
The OLED driving device according to claim 2 or 3, wherein the first switch tube is used to turn on or turn off according to a first control signal, and the period of the first control signal is 1/N of the display period, The display period includes a light-emitting phase and a compensation phase, and N is a positive integer;

In the compensation phase, the first switching tube and the second switching tube are in an off state, and the fourth switching tube and the fifth switching tube are in an on state;

In the light-emitting phase, the fourth switch tube and the fifth switch tube are in an off state;

During the light-emitting stage and the first switch tube is in the conducting state, the second switch tube is used to perform multiple switching actions to control the light-emitting time of the OLED.
The OLED driving device according to any one of claims 2-4, wherein the first switch tube is used to turn on or off according to a first control signal, and the second switch tube is used to turn on or off according to a second control signal. On or off, the period of the first control signal is a positive integer multiple of the period of the second control signal.
The OLED driving device according to any one of claims 1 to 5, wherein the second switch tube is configured to be turned on or off according to a second control signal, and the second control signal is a PWM signal.
A display device, comprising the organic light emitting diode OLED and an OLED driving device according to any one of claims 1-6.
A control method of an organic light-emitting diode OLED driving device, wherein the OLED driving device includes a first switch tube and a second switch tube connected in series, and the first switch tube, the second switch tube, and the OLED are connected in series. connect;

The method includes:

Generate multiple control signals, the multiple control signals include a first control signal and a second control signal, the first control signal is used to control the first switch tube, the second control signal is used to control the The second switch tube,

The multiple control signals enable the second switch tube to perform a switching action to control the light-emitting time of the OLED during the time period when the first switch tube is in the conducting state during the light-emitting stage of the OLED;

The multiple control signals are sent to the OLED driving device.
The method according to claim 8, wherein the OLED driving device comprises a third switch tube, a fourth switch tube, and a fifth switch tube;

The third switching tube is connected in series with the first switching tube and the second switching tube, the third switching tube is located between the first switching tube and the second switching tube, and the first switching tube is The switch tube or the second switch tube is located between the third switch tube and the OLED;

The first end of the fourth switch tube is connected to the first end of the third switch tube, and the second end of the fourth switch tube is connected to the control end of the third switch tube;

The first end of the fifth switch tube is connected to the second end of the third switch tube, and the second end of the fifth switch tube is used to receive a data signal.
The method according to claim 9, wherein the multiple control signals comprise a third control signal, and the third control signal is used to control the fourth switch tube and the fifth switch tube;

The multiple control signals enable:

In the compensation phase, the first switching tube and the second switching tube are in an off state, and the fourth switching tube and the fifth switching tube are in an on state;

In the light-emitting phase, the fourth switch tube and the fifth switch tube are in an off state;

In the light-emitting phase, the first switch tube maintains a conducting state.
The method according to claim 9 or 10, wherein the multiple control signals comprise a third control signal, and the third control signal is used to control the fourth switch tube and the fifth switch tube;

The period of the first control signal is 1/N of the display period, the display period includes a light-emitting phase and a compensation phase, and N is a positive integer;

The multiple control signals enable:

In the compensation phase, the first switching tube and the second switching tube are in an off state, and the fourth switching tube and the fifth switching tube are controlled to be in an on state;

In the light-emitting phase, the fourth switch tube and the fifth switch tube are in an off state;

During the light-emitting stage and the first switch tube is in the conducting state, the second switch tube performs multiple switching operations to control the light-emitting time of the OLED.
The method according to any one of claims 9-11, wherein the period of the first control signal is a positive integer multiple of the period of the second control signal.
The method according to any one of claims 8-12, wherein the second control signal is a PWM signal.
A control device of an organic light emitting diode OLED driving device, which is characterized in that it comprises a memory and a processor;

The memory is used to store programs;

When the program is executed in the control device, the processor is configured to execute the method according to any one of claims 8-13.
A display device comprising the OLED, an OLED driving device, and a control device of the OLED driving device according to claim 14.
A control device for an organic light-emitting diode OLED driving device, characterized in that it comprises various functional modules for executing the method according to any one of claims 8-13.
A computer-readable storage medium, wherein the computer-readable medium stores program code for device execution, and the program code includes a method for executing the method according to any one of claims 8-13.
A chip, characterized in that the chip comprises a processor and a data interface, and the processor reads the instructions stored on the memory through the data interface to execute the method according to any one of claims 8-13 method.