CN113724658A

CN113724658A - Control method and device of pixel driving unit, display screen and terminal equipment

Info

Publication number: CN113724658A
Application number: CN202010454001.9A
Authority: CN
Inventors: 李健; 唐磊; 徐志文
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2021-11-30

Abstract

The disclosure relates to a control method of a pixel driving unit, a display screen and a terminal device. The control method of the pixel driving unit is applied to a display screen, the display screen comprises a plurality of pixel driving units corresponding to pixel points, and the control method of the pixel driving unit comprises the following steps: acquiring the current temperature; determining a first voltage value of the pixel driving unit corresponding to the temperature based on the current temperature; the pixel driving unit is supplied with power at a first voltage value in response to a driving signal. The voltage value required by the corresponding driving voltage is determined according to the current temperature, and when the driving is needed, the power is supplied by the voltage value, so that even if the threshold voltage deviates at the current temperature, the driving voltage can be correspondingly adjusted, the electric leakage of the pixel driving unit is prevented, the insufficient voltage or the overhigh voltage is avoided, the pixels can be normally controlled, and the phenomena of display errors and the like are avoided.

Description

Control method and device of pixel driving unit, display screen and terminal equipment

Technical Field

The present disclosure relates to the field of image display, and in particular, to a method for controlling a pixel driving unit, a device for controlling a pixel driving unit, a display screen, and a terminal device.

Background

At present, in a display screen of a terminal device such as a mobile phone and a computer, each pixel point of the display screen is controlled by a pixel driving circuit, the pixel driving circuit generally has a plurality of pixel driving units, each pixel driving unit may further include a plurality of TFTs (Thin Film transistors), for example, a 7T 1C-structured pixel driving unit includes seven TFTs and a capacitor, and each pixel driving unit controls each pixel point.

The characteristics of the TFT have a certain correlation with temperature, and the threshold voltage of the TFT may shift with the increase of temperature, in which case, the TFT switch may not be completely turned off or turned on by the driving voltage set by the original TFT, which may cause problems such as current leakage or insufficient power supply of the pixel driving unit, crosstalk, and the like, and display a bad picture such as vertical stripes, or local black dots, on the display screen.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides a control method of a pixel driving unit, a display screen, and a terminal device.

According to a first aspect of the embodiments of the present disclosure, there is provided a method for controlling a pixel driving unit, which is applied to a display screen including a plurality of pixel driving units corresponding to pixel points, the method including: acquiring the current temperature of the display screen; determining a first voltage value of the pixel driving unit corresponding to the temperature based on the current temperature; and responding to a driving signal, and supplying power to the pixel driving unit at the first voltage value.

In an embodiment, the supplying the power to the pixel driving unit with the first voltage value is implemented by: and applying a driving voltage to the gate of the pixel driving unit, wherein the voltage value of the driving voltage is the first voltage value.

In an embodiment, the determining, based on the current temperature, a first voltage value of the pixel driving unit corresponding to the temperature includes: and determining the first voltage value corresponding to the current temperature according to a preset temperature-voltage corresponding relation based on the current temperature.

In one embodiment, the temperature-voltage correspondence is determined by: determining a plurality of test temperature intervals; when the temperature is in each test temperature interval, determining a threshold voltage value corresponding to each test temperature interval of the pixel driving unit; and determining a voltage value required by the driving voltage corresponding to each test temperature interval based on each threshold voltage value.

In one embodiment, the current temperature of the display screen is obtained through a thermistor or a thermal diode.

In one embodiment, the display screen further comprises an integrated circuit connected with the pixel driving unit through a circuit board; the thermistor or the thermal diode is arranged on the circuit board, or the integrated circuit is integrated with the thermistor or the thermal diode.

According to a second aspect of the embodiments of the present disclosure, there is provided a control device of a pixel driving unit, applied to a display screen including a plurality of pixel driving units corresponding to pixel points, the device including: the acquisition unit is used for acquiring the current temperature of the display screen; the determining unit is used for determining a first voltage value corresponding to the temperature of the pixel driving unit based on the current temperature; and the processing unit is used for responding to the driving signal and supplying power to the pixel driving unit at the first voltage value.

In one embodiment, the processing unit supplies power to the pixel driving unit by: and applying a driving voltage to the gate of the pixel driving unit, wherein the voltage value of the driving voltage is the first voltage value.

In an embodiment, the determining unit is configured to: and determining the first voltage value corresponding to the current temperature according to a preset temperature-voltage corresponding relation based on the current temperature.

In an embodiment, the obtaining unit is configured to: and acquiring the current temperature of the display screen through a thermistor or a thermal diode.

According to a third aspect of the embodiments of the present disclosure, there is provided a display screen including: the pixel driving units are used for controlling corresponding pixel points; the thermistor or the thermal diode is used for acquiring the current temperature; and an integrated circuit electrically connected to the pixel driving unit through a circuit board, the pixel driving unit being controlled by the control method of the pixel driving unit according to the first aspect based on the current temperature.

According to a fourth aspect of the embodiments of the present disclosure, there is provided a terminal device, including: a display panel comprising a plurality of pixel driving units and controlled by the control method of the pixel driving unit as in the first aspect.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the voltage value required by the corresponding driving voltage is determined according to the current temperature, and when the TFT of the pixel driving unit needs to be driven, power is supplied by the voltage value, so that even if the threshold voltage is deviated at the current temperature, the driving voltage can be correspondingly adjusted, the electric leakage of the pixel driving unit is prevented, insufficient voltage or overhigh voltage is avoided, for example, under the condition that the threshold voltage is increased, the driving voltage is ensured to exceed the threshold voltage, the corresponding TFT can be completely turned off or normally turned on, the pixel can be normally controlled, and the phenomena of display errors and the like are avoided.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic diagram illustrating a control method of a pixel driving unit according to an exemplary embodiment.

Fig. 2 is a schematic diagram illustrating another control method of a pixel driving unit according to an exemplary embodiment.

Fig. 3 is a schematic diagram illustrating threshold voltage shift of a pixel driving unit according to an exemplary embodiment.

Fig. 4 is a schematic flow diagram illustrating a pixel driving unit according to an exemplary embodiment.

Fig. 5 is a schematic block diagram illustrating a control apparatus of a pixel driving unit according to an exemplary embodiment.

FIG. 6 is a block diagram illustrating an apparatus in accordance with an example embodiment.

FIG. 7 is a block diagram illustrating an apparatus in accordance with an example embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

It should be noted that, although the expressions "first", "second", etc. are used herein to describe different modules, steps, data, etc. of the embodiments of the present disclosure, the expressions "first", "second", etc. are merely used to distinguish between different modules, steps, data, etc. and do not indicate a particular order or degree of importance. Indeed, the terms "first," "second," and the like are fully interchangeable.

Because the temperature can affect the threshold voltage of the pixel driving unit, and the threshold voltage is the voltage threshold of whether the channel is switched on or off in the TFT circuit, when the power supply driving voltage exceeds the threshold voltage, the control of the pixel point is completed according to the actual structure of the TFT. The driving of the TFT by the driving voltage in the present disclosure may include keeping the TFT in an off state by the driving voltage, or turning on the TFT by the driving voltage, according to different types of TFTs and different effects. As some pixel driving units, as shown in fig. 1, power is supplied to a gate G, so that a gate voltage exceeds a threshold voltage, a P channel is turned on, a source S and a drain D are turned on, a drain current is formed, control of the drain current by an input driving voltage is realized, and further control of the pixel is realized; as another pixel driving unit, fig. 2 shows a schematic diagram of the pixel driving unit of 7T1C, where 7T1C represents that the pixel driving unit has seven TFTs and a capacitor, when the display screen requires a low brightness or a black picture, EM is at a high level, T5 and T6 are turned off, and the gate voltage VGS (T2) ═ scan voltage Vscan-data voltage Vdata ═ 0V.

As shown in fig. 3, the threshold voltage Vth is normally 0, as shown by the solid line in fig. 3, when T2 and T3 are off. The potential of the point Q at one end of the capacitor C1 remains unchanged. If the VTh shifts positively as the temperature rises, as shown by the dashed line in fig. 3, then Vgs is less than the post-shift high temperature VTh value (denoted as VTh2) if the value of VTh shift is large enough, such that the gate voltage Vgs, which is originally greater than the threshold voltage, is < VTh 2. At this time, T2 and T3 are turned on, and a leakage current flows to the Q point, and the Q point is not held at its original potential and the Q potential rises. The TFT of T1 acts as a voltage controlled constant current source, and the constant current source of T1 changes in value, affecting the brightness of the diode when turned on, causing cross talk and vertical bright lines,

in order to solve the problems, the pixel driving units of the display screen can normally operate under different temperature conditions, and the display problem caused by the change of the threshold voltage caused by the change of the temperature can be avoided. The embodiment of the present disclosure provides a control method 10 for a pixel driving unit, which can be used in a display screen, such as an OLED (Organic Light-Emitting Diode) screen, where a pixel driving circuit of the display screen has a plurality of TFTs, and each TFT correspondingly controls one pixel point. As shown in fig. 4, the control method 10 of the pixel driving unit includes steps S11 to S13, which will be described in detail below.

And step S11, acquiring the current temperature of the display screen.

In some embodiments, the temperature of the display screen, including the temperature of the pixel driving circuit, etc., may be obtained by a thermosensitive element, such as a thermistor, a thermal diode, etc. By acquiring the current temperature of the display screen, it can be further determined at which driving voltage the display screen should be driven currently.

In some embodiments, the display screen may further include an Integrated Circuit (IC) connected to the pixel driving unit through a circuit board; the thermistor or the thermal diode is arranged on the circuit board, or the integrated circuit is integrated with the thermistor or the thermal diode. In this embodiment, the thermosensitive element for acquiring the temperature may be disposed on a Circuit board, and the Circuit board may be a Flexible Printed Circuit (FPC).

In step S12, a first voltage value of the pixel driving unit corresponding to the temperature is determined based on the current temperature.

Since the threshold voltages of the pixel driving units vary at different temperatures, in order to control the pixels more accurately, the voltage value of the driving voltage needs to be changed in the same way, that is, if the threshold voltage is increased, the voltage value of the driving voltage is increased correspondingly, and vice versa.

In an embodiment, step S12 may include determining a first voltage value corresponding to the current temperature according to a preset temperature-voltage correspondence relationship based on the current temperature. In this embodiment, the corresponding relationship between the temperature and the voltage, that is, the voltage values corresponding to different temperatures, may be predetermined, and after the current temperature of the display screen is obtained through the predetermined corresponding relationship, the voltage value required for the current driving may be determined according to the corresponding relationship.

In one embodiment, the temperature-voltage correspondence may be determined by: determining a plurality of test temperature intervals; when the temperature is in each test temperature interval, determining a threshold voltage value corresponding to each test temperature interval of the pixel driving unit; and determining the voltage value required by the driving voltage corresponding to each test temperature interval based on each threshold voltage value. In this embodiment, the driving voltage values required to be driven at different temperatures may be predetermined. For example, the display screen may be placed in an environment where the ambient temperature may be adjusted, or the temperature of the display screen may be changed by operating different conditions. The temperature is determined through the thermosensitive element, then characteristic curves of one or more TFTs (thin film transistors) in a pixel driving unit of the display screen at different temperatures are tested, namely the TFTs are required to be kept in a turn-off state or a connection state at different temperatures to find a group of threshold voltage change values corresponding to the TFTs at different temperatures, a corresponding relation between the threshold voltage and a temperature interval can be formed, different driving voltages corresponding to different temperatures are further burnt in the display screen IC, therefore, in practical application, when the temperature of the display screen changes, the thermosensitive element feeds back information to the display screen IC after measuring the temperature of the display screen, the display screen IC automatically switches to a driving voltage gear corresponding to the current temperature, and when a driving signal exists, the grid can be directly supplied with power through the driving voltage.

For example, table 1 exemplarily shows the variation of the threshold voltage Vth of one TFT at different temperatures and the corresponding adjusted driving voltage Vscan. As shown in table 1, where the variation value is 0V between 20 degrees celsius and 40 degrees celsius, the corresponding driving voltage Vscan is constant, and is maintained at 7V; the change value at 50 degrees celsius is 0.5V, which means that at 50 degrees celsius, the threshold voltage is increased by 0.5V, so the driving voltage Vscan also needs to be increased by 0.5V to 7.5V. And by analogy, driving voltage values corresponding to different temperatures are obtained.

Temperature of

20℃

20-40℃

50℃

55℃

60℃

65℃

70℃

75℃

Vth

-0.3V

0V

0.5V

0.7V

1V

1.5V

2V

2.3V

Vscan

6.7V

7V

7.5V

7.7V

8V

8.5V

9V

9.3V

TABLE 1

In step S13, power is supplied to the pixel driving unit at the first voltage value in response to the driving signal.

After determining a voltage value required for driving the voltage under the current temperature condition, the pixel driving unit supplies power to the pixel driving unit at the determined first voltage value in response to the driving signal. Thereby avoiding the conditions of electric leakage and the like and ensuring the quality of screen display. For example, a driving voltage is applied to the gate of the pixel driving unit, the voltage value of the driving voltage is a first voltage value, and the first voltage value is determined according to the current temperature, so that the driving voltage can be ensured to exceed the threshold voltage, and the driving purpose required by the TFT can be achieved, such as ensuring that the off state is not electrically leakage in some TFTs or ensuring that the source S and the drain D are normally connected in some TFTs. For example, in the structure of 7T1C, it is ensured that the pixel driving circuit can always accurately turn off T2 and T3 at different temperatures, thereby preventing leakage current and ensuring accurate control of the pixel.

Based on the same inventive concept, the present disclosure also provides a display screen, which may be a mobile phone display screen or a computer display screen, and the display screen may include: the pixel driving units are used for controlling corresponding pixel points; e.g., 7T1C pixel drive circuits; the display screen can also be used for acquiring the current temperature through a thermistor or a thermal diode, wherein the thermistor or the thermal diode can be mounted on an integrated circuit or a circuit board; the integrated circuit is electrically connected with the pixel driving unit through the circuit board, and the pixel driving unit is controlled through the control method 10 of the pixel driving unit of any one of the foregoing embodiments based on the current temperature.

Through the display screen of the embodiment, the control of the display screen on the pixels is more convenient and accurate by adjusting the power supply voltage under different temperature conditions.

Based on the same inventive concept, the present disclosure also provides a terminal device, comprising: a display panel comprising a plurality of pixel driving units and being controlled by the control method of the pixel driving unit of the control method 10 of the pixel driving unit of any of the previous embodiments.

Through the terminal equipment of the embodiment, the control of the display screen of the terminal equipment on the pixels can be more convenient and accurate by adjusting the power supply voltage under different temperature conditions.

Based on the same inventive concept, fig. 5 shows a control device 100 for a pixel driving unit, which is applied to a display screen, where the display screen includes a plurality of pixel driving units corresponding to pixel points, and the control device 100 for the pixel driving units includes: an obtaining unit 110, configured to obtain a current temperature of the display screen; a determining unit 120, configured to determine, based on the current temperature, a first voltage value of the pixel driving unit corresponding to the temperature; the processing unit 130 is configured to supply power to the pixel driving unit at a first voltage value in response to the driving signal.

In one embodiment, the processing unit 130 supplies power to the pixel driving unit by: and applying a driving voltage to the gate of the pixel driving unit, wherein the voltage value of the driving voltage is a first voltage value.

In an embodiment, the determining unit 120 is configured to: and determining a first voltage value corresponding to the current temperature according to a preset temperature-voltage corresponding relation based on the current temperature.

In one embodiment, the temperature-voltage correspondence is determined by: determining a plurality of test temperature intervals; when the temperature is in each test temperature interval, determining a threshold voltage value corresponding to each test temperature interval of the pixel driving unit; and determining the voltage value required by the driving voltage corresponding to each test temperature interval based on each threshold voltage value.

In an embodiment, the obtaining unit 110 is configured to: and acquiring the current temperature of the display screen through a thermistor or a thermal diode.

With regard to the control apparatus 100 of the pixel driving unit in the above-described embodiment, the specific manner in which each unit performs the operation has been described in detail in the embodiment of the control method 10 of the pixel driving unit, and will not be described in detail here.

Fig. 6 is a schematic block diagram illustrating an apparatus of any of the previous embodiments in accordance with an exemplary embodiment. For example, the apparatus 500 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.

Referring to fig. 6, the apparatus 500 may include one or more of the following components: processing component 502, memory 504, power component 506, multimedia component 508, audio component 510, input/output (I/O) interface 512, sensor component 514, and communication component 516.

The processing component 502 generally controls overall operation of the device 500, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 502 may include one or more processors 520 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 502 can include one or more modules that facilitate interaction between the processing component 502 and other components. For example, the processing component 502 can include a multimedia module to facilitate interaction between the multimedia component 508 and the processing component 502.

The memory 504 is configured to store various types of data to support operations at the apparatus 500. Examples of such data include instructions for any application or method operating on device 500, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 504 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

The power supply component 506 provides power to the various components of the device 500. The power components 506 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power supplies for the apparatus 500.

The multimedia component 508 includes a screen that provides an output interface between the device 500 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 508 includes a front facing camera and/or a rear facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the device 500 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 510 is configured to output and/or input audio signals. For example, audio component 510 includes a Microphone (MIC) configured to receive external audio signals when apparatus 500 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 504 or transmitted via the communication component 516. In some embodiments, audio component 510 further includes a speaker for outputting audio signals.

The I/O interface 512 provides an interface between the processing component 502 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

The sensor assembly 514 includes one or more sensors for providing various aspects of status assessment for the device 500. For example, the sensor assembly 514 may detect an open/closed state of the apparatus 500, the relative positioning of the components, such as a display and keypad of the apparatus 500, the sensor assembly 514 may also detect a change in the position of the apparatus 500 or a component of the apparatus 500, the presence or absence of user contact with the apparatus 500, orientation or acceleration/deceleration of the apparatus 500, and a change in the temperature of the apparatus 500. The sensor assembly 514 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 514 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 514 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 516 is configured to facilitate communication between the apparatus 500 and other devices in a wired or wireless manner. The apparatus 500 may access a wireless network based on a communication standard, such as WiFi, 2G or 5G, or a combination thereof. In an exemplary embodiment, the communication component 516 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 516 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the apparatus 500 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.

In an exemplary embodiment, a computer-readable storage medium comprising instructions, such as the memory 504 comprising instructions, executable by the processor 520 of the apparatus 500 to perform the above-described method is also provided. For example, the computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

Fig. 7 is a block diagram illustrating an electronic device 400 according to an example embodiment. For example, the apparatus 400 may be provided as a server. Referring to fig. 7, apparatus 400 includes a processing component 422 that further includes one or more processors and memory resources, represented by memory 442, for storing instructions, such as application programs, that are executable by processing component 422. The application programs stored in memory 442 may include one or more modules that each correspond to a set of instructions. Further, the processing component 422 is configured to execute instructions to perform the above-described methods.

The apparatus 400 may also include a power component 426 configured to perform power management of the apparatus 300, a wired or wireless network interface 450 configured to connect the apparatus 400 to a network, and an input output (I/O) interface 458. The apparatus 400 may operate based on an operating system stored in the memory 442, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. A method for controlling a pixel driving unit, applied to a display panel including a plurality of pixel driving units corresponding to pixel points, the method comprising:

acquiring the current temperature of the display screen;

determining a first voltage value of the pixel driving unit corresponding to the temperature based on the current temperature;

and responding to a driving signal, and supplying power to the pixel driving unit at the first voltage value.

2. The method of claim 1, wherein the supplying power to the pixel driving unit at the first voltage value is performed by:

and applying a driving voltage to the gate of the pixel driving unit, wherein the voltage value of the driving voltage is the first voltage value.

3. The method for controlling a pixel driving unit according to claim 1, wherein the determining a first voltage value of the pixel driving unit corresponding to the temperature based on the current temperature comprises:

and determining the first voltage value corresponding to the current temperature according to a preset temperature-voltage corresponding relation based on the current temperature.

4. The method of controlling a pixel driving unit according to claim 3, wherein the temperature-voltage correspondence is determined by:

determining a plurality of test temperature intervals;

when the temperature is in each test temperature interval, determining a threshold voltage value corresponding to each test temperature interval of the pixel driving unit; and a process for the preparation of a coating,

and determining a voltage value required by the driving voltage corresponding to each test temperature interval based on each threshold voltage value.

5. The method of controlling a pixel driving unit according to claim 1, wherein the current temperature of the display screen is obtained by a thermistor or a thermal diode.

6. The method of controlling a pixel driving unit according to claim 5, wherein the display screen further comprises an integrated circuit connected to the pixel driving unit via a circuit board;

the thermistor or the thermal diode is arranged on the circuit board, or the integrated circuit is integrated with the thermistor or the thermal diode.

7. A control apparatus of a pixel driving unit, applied to a display panel including a plurality of pixel driving units corresponding to pixel points, the apparatus comprising:

the acquisition unit is used for acquiring the current temperature of the display screen;

the determining unit is used for determining a first voltage value corresponding to the temperature of the pixel driving unit based on the current temperature;

and the processing unit is used for responding to the driving signal and supplying power to the pixel driving unit at the first voltage value.

8. The control device of a pixel driving unit according to claim 7, wherein the processing unit supplies power to the pixel driving unit by:

9. The control device of the pixel driving unit according to claim 7, wherein the determination unit is configured to:

10. The control device of the pixel driving unit according to claim 9, wherein the temperature-voltage correspondence is determined by:

determining a plurality of test temperature intervals;

11. The control device of the pixel driving unit according to claim 7, wherein the obtaining unit is configured to: and acquiring the current temperature of the display screen through a thermistor or a thermal diode.

12. The control device of the pixel driving unit according to claim 11, wherein the display screen further comprises an integrated circuit connected to the pixel driving unit via a circuit board;

13. A display screen, wherein the display screen comprises:

the pixel driving units are used for controlling corresponding pixel points;

the thermistor or the thermal diode is used for acquiring the current temperature;

an integrated circuit electrically connected to the pixel driving unit through a circuit board, the pixel driving unit being controlled by the control method of the pixel driving unit according to claims 1 to 6 based on the current temperature.

14. A terminal device, characterized in that the terminal device comprises: display screen comprising a plurality of pixel driving units and being controlled by a method of controlling a pixel driving unit as claimed in claims 1-6.