Driving chip and display device

Abstract

A driving chip and a display device are used for maintaining the driving power of the driving chip when the voltage of a power supply changes rapidly. The driving chip comprises a constant current module, at least one current compensation module and a plurality of driving modules; the constant current module provides a first current for a first branch in the current compensation module; the current compensation module comprises a first branch and a second branch, the first ends of the two branches are connected with a power supply, the second end of the first branch is grounded through the constant current module, and the second end of the second branch is grounded; the plurality of driving modules are connected with at least one current compensation module; the first branch circuit comprises a plurality of switching devices which are connected in series, the second branch circuit comprises switching devices which are in one-to-one correspondence with the switching devices in the first branch circuit, and the control end of each switching device in the first branch circuit is connected with the control end of the corresponding switching device; and a target node of the second branch is connected with the control end of one switching device in each driving module, and the target node is a connection point of two adjacent switching devices in the second branch.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a driver chip and a display device. Background Technology

[0002] In recent years, with the advancement of display technology and the increasing consumer demand, there has been a growing need for high-speed refresh rate and high resolution in electronic devices. This has placed higher demands on the driving stability and voltage conversion speed of the internal driver chips of electronic devices.

[0003] In actual use, the driver chip in electronic devices is prone to power supply voltage fluctuations. For example, when the power supply voltage drops rapidly at a rate of microseconds, the driver chip includes a driver module for driving the light-emitting device. The control terminal capacitor of the metal oxide semiconductor (MOS) transistor in the driver module causes the control terminal potential of the switching device to stabilize. This leads to a decrease in the current or voltage amplitude output by the driver module due to the reduced startup voltage of the switching device. Since the brightness of the light-emitting device is related to the current or voltage amplitude output by the driver module, the drop in power supply voltage will cause a decrease in the driving power of the driver chip, which may cause the screen to suddenly dim when it refreshes at high speed. Summary of the Invention

[0004] This application provides a driver chip and a display device for maintaining the driving power of the driver chip and ensuring the display stability of the display device when the power supply voltage changes rapidly.

[0005] In a first aspect, embodiments of this application provide a driver chip, which is applied in an electronic device with display function to drive the light-emitting devices of a display panel. The driver chip may include a constant current module, at least one current compensation module, and multiple driver modules.

[0006] Specifically, the constant current module is connected to the first branch of the at least one current compensation module to provide a first current to the first branch of the at least one current compensation module; the at least one current compensation module includes the first branch and the second branch, the first end of the first branch and the first end of the second branch are connected to the power supply, the second end of the first branch is grounded through the constant current module, and the second end of the second branch is grounded; the plurality of driving modules are connected to the at least one current compensation module, and the plurality of driving modules are used to connect to the power supply and the light-emitting device, and drive the light-emitting device to emit light.

[0007] The first branch includes multiple switching devices connected in series between the power supply and the constant current module. The second branch includes switching devices that correspond one-to-one with each switching device in the first branch. The control terminal of each switching device in the first branch is connected to the control terminal of the corresponding switching device in the second branch. The target node of the second branch is connected to the control terminal of a switching device in each drive module. The target node is the connection point between two adjacent switching devices in the second branch.

[0008] With the above design, when the power supply voltage drops, since the first branch is connected in series with the constant current module, the voltages at the control terminals, source, and drain of the switching devices in the first branch will all decrease in order to maintain a constant current amplitude. Therefore, the control terminal voltages of the corresponding switching devices in the second branch and the first branch will decrease, leading to an increase in the voltage difference between the control terminals of the switching devices in the second branch and the ports directly or indirectly connected to the power supply. This increases the current in the other switching devices in the second branch besides those directly connected to the power supply. The parasitic capacitance at the control terminals of the switching devices in the drive module will discharge to compensate for the increased current provided by the second branch. The discharge of the parasitic capacitance at the control terminals of the switching devices causes a decrease in the control terminal voltage. Therefore, when the power supply voltage drops, the control terminal voltage of the switching devices in the drive module will also decrease, thereby increasing the drive current or drive voltage output by the drive module. Thus, the drive power of the drive chip can still be maintained even when the power supply voltage changes.

[0009] In one possible implementation, the first branch includes a first switching device and a second switching device.

[0010] Wherein, the first end of the first switching device is connected to the power supply, the second end of the first switching device is connected to the first end of the second switching device, and the control end of the first switching device is connected to the control end of the corresponding switching device in the second branch; the second end of the second switching device is connected to the constant current module and the control end of the second switching device, and the control end of the second switching device is connected to the control end of the corresponding switching device in the second branch.

[0011] In one possible implementation, the second branch includes a third switching device, a fourth switching device, and a fifth switching device.

[0012] In this configuration, the first terminal of the third switching device is connected to the power supply, the second terminal of the third switching device is connected to the first terminal of the fourth switching device, and the control terminal of the third switching device is connected to both the control terminal of the first switching device and the second terminal of the third switching device. The first terminal of the fourth switching device is connected to the control terminal of one of the switching devices in the drive module, the second terminal of the fourth switching device is connected to the first terminal of the fifth switching device, and the control terminal of the fourth switching device is connected to the control terminal of the second switching device. The second terminal of the fifth switching device is grounded, and the control terminal of the fifth switching device is connected to the first terminal of the fifth switching device.

[0013] With the above design, since the first and second switching devices in the first branch are connected in series with the constant current module, when the power supply voltage drops, the voltage between the second terminal of the first switching device, the control terminal of the second switching device, the first terminal, and the second terminal will all drop. The drop in the control terminal voltage of the second switching device will cause the voltage difference between the first terminal and the control terminal of the fourth switching device to increase, and the current flowing through the fourth switching device will increase. Meanwhile, the current of the third switching device will decrease due to the drop in power supply voltage. Therefore, this increased current is provided by the parasitic capacitance of the control terminal of the switching device in the drive module, so that the control terminal voltage of the switching device also drops when the power supply voltage drops, maintaining the current or voltage amplitude output by the drive module.

[0014] In one possible implementation, the second branch further includes a current-limiting resistor connected between the third and fourth switching devices.

[0015] With the above design, when the power supply voltage drops, causing the current of the fourth switching device to increase, the voltage difference between the drain and source of the third switching device decreases due to the voltage division effect of the current-limiting resistor. The source-drain current amplitude provided by the third switching device to the fourth switching device is small. Therefore, the increased current of the fourth switching device is mainly provided by the control terminal capacitor of the switching device in the drive module, which accelerates the discharge speed of the parasitic capacitor of the switching device in the drive module, thereby accelerating the driving speed of the drive module.

[0016] In one possible implementation, the constant current module includes: a current source and a current mirror circuit corresponding one-to-one with each of the at least one current compensation module. Each current mirror circuit is connected to a first branch in the corresponding current compensation module, and each current mirror circuit is used to provide the first current to the connected first branch. With this design, when each current compensation module is connected to switching devices at different locations in the drive module, the required bias voltage amplitude of the switching devices connected to each current compensation module is different. To ensure that the operation of multiple current compensation modules does not interfere with each other, a corresponding current mirror circuit can be configured for each current compensation module.

[0017] In one possible implementation, each current mirror circuit includes a sixth, a seventh, an eighth, and a ninth switching device.

[0018] Wherein, the first terminal of the sixth switching device is connected to the current source, the second terminal of the sixth switching device is connected to the first terminal of the seventh switching device, and the control terminal of the sixth switching device is connected to the control terminal of the eighth switching device; the first terminal of the seventh switching device is connected to the control terminal of the seventh switching device, the second terminal of the seventh switching device is grounded, and the control terminal of the seventh switching device is connected to the control terminal of the ninth switching device; the first terminal of the eighth switching device is connected to the first branch in the corresponding current compensation module, the second terminal of the eighth switching device is connected to the first terminal of the ninth switching device; and the second terminal of the ninth switching device is grounded.

[0019] In one possible implementation, each current mirror circuit outputs a different initial current amplitude. With this design, the switching devices at different locations in the drive module require different control terminal bias voltages. Therefore, different current amplitudes can be provided to each current compensation module based on the voltage requirements of the switching devices connected to each current compensation module.

[0020] In one possible implementation, the switching devices in the first branch of each current compensation module have different sizes. With this design, different positions within the drive module require different control terminal bias voltages. The voltage requirements of the switching devices connected to each current compensation module are determined by configuring appropriate sizes for the switching devices in the first branch, thus providing them with suitable bias voltages.

[0021] In one possible implementation, each current compensation module is connected to the control terminal of a different switching device in the drive module, and the switching device connected to each current compensation module is coupled to the power supply.

[0022] It should be noted that the driver chip structure provided in the first aspect of the embodiments of this application is only a part of the functional circuits in the driver chip. In actual applications, the driver chip may also include other functional circuits. For example, the driver chip may also include a display signal generation circuit, which is used to control the display pattern of the display panel.

[0023] Secondly, embodiments of this application provide a display device, which may include: a power supply, and a plurality of light-emitting devices such as the driver chip provided in the first aspect of the embodiments of this application and any possible design thereof.

[0024] Furthermore, the technical effects of the second aspect and any of its possible designs can be found in the technical effects of different designs in the first aspect of the embodiments of this application, and will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of a driver chip provided in an embodiment of this application. Figure 1 ;

[0027] Figure 2 A schematic diagram of the structure of a current compensation module provided in this application embodiment. Figure 1 ;

[0028] Figure 3 A schematic diagram of the structure of a current compensation module provided in this application embodiment. Figure 2 ;

[0029] Figure 4 A schematic diagram of the structure of a current compensation module provided in this application embodiment. Figure 3 ;

[0030] Figure 5 A schematic diagram of the structure of a current compensation module provided in this application embodiment. Figure 4 ;

[0031] Figure 6 This is a schematic diagram of a current mirror circuit provided in an embodiment of this application;

[0032] Figure 7 A schematic diagram of the structure of a driver module provided in an embodiment of this application. Figure 1 ;

[0033] Figure 8 A schematic diagram of the structure of a driver module provided in an embodiment of this application. Figure 2 ;

[0034] Figure 9 A schematic diagram of the structure of a driver chip provided in an embodiment of this application. Figure 2 ;

[0035] Figure 10 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Detailed Implementation

[0036] The application scenarios of the technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings. The solutions provided in the embodiments of this application can be applied to electronic devices with display functions and are used to solve the problem of unstable driving current or driving voltage output by the driver chip due to power supply voltage fluctuations. Since the ability of the driver chip to drive the light-emitting device to emit light is related to the driving current or driving voltage, a decrease in driving current or driving voltage will lead to insufficient driving power of the driver chip, affecting the normal display of the electronic device.

[0037] To address the aforementioned issues, this application provides a driver chip and a display device to maintain the driving power of the driver chip when the power supply voltage drops, thereby ensuring the normal display of the electronic device.

[0038] See Figure 1 The diagram shown is a schematic representation of a driver chip provided in an embodiment of this application. This driver chip can be applied in electronic devices with display functions, serving as a functional circuit within the electronic device, and is connected to the light-emitting device used for display in the electronic device. Figure 1 As shown, the driver chip may include a constant current module, at least one current compensation module, and multiple driver modules.

[0039] The constant current module is connected to the first branch of at least one current compensation module to provide a first current to the first branch of the at least one current compensation module. The at least one current compensation module includes a first branch and a second branch. The first end of the first branch and the first end of the second branch are connected to the power supply. The second end of the first branch is grounded through the constant current module, and the second end of the second branch is grounded. Multiple driving modules are connected to at least one current compensation module. The multiple driving modules are connected to the power supply and the light-emitting device and drive the light-emitting device to emit light.

[0040] In practical applications, the current compensation module provides a bias voltage to the control terminal of the switching device in the drive module, and adjusts the conduction degree of the control switching device by adjusting the control terminal voltage of the switching device in the drive module.

[0041] The current compensation module includes a first branch and a second branch. The first branch includes multiple switching devices connected in series between the power supply and the constant current module. The second branch includes a switching device that corresponds one-to-one with each switching device in the first branch. The control terminal of each switching device in the first branch is connected to the control terminal of the corresponding switching device in the second branch. The target node of the second branch is connected to the control terminal of one switching device in each drive module. The target node is the connection point between two adjacent switching devices in the second branch.

[0042] The current compensation module provided in this application embodiment can provide bias voltage for the switching devices in the drive module and provide charging and discharging paths during power fluctuations. Taking a P-channel MOSFET as an example, if the power supply voltage connected to the current compensation module and the drive module drops, since the first branch is connected to the constant current module, in order to maintain a constant current amplitude, the voltage amplitudes of the gate, source, and drain of multiple switching devices in the first branch all decrease. The gate voltage of the switching device in the second branch corresponding to each switching device in the first branch also decreases, resulting in an increase in the voltage difference between the gate and drain of the switching device in the second branch. Therefore, the port voltage difference between different switching devices in the second branch is different, which in turn leads to a difference in the current between two adjacent switching devices in the second branch. The parasitic capacitance at the control terminal of the switching device in the drive module provides the aforementioned increased current. The discharge of the parasitic capacitance will cause the gate voltage of the switching device in the drive module to drop. Therefore, by adopting the solution of this application, when the power supply voltage drops, the gate voltage of the switching device in the drive module also drops. Thus, when the power supply voltage drops, the current amplitude or voltage amplitude output by the drive module can be maintained, thereby further maintaining the driving power of the drive module.

[0043] In practical applications, the driver chip can be fixed to the display screen of an electronic device. In another implementation, the driver chip can be designed to be flexible and detachable, meaning that both the driver chip and the display screen have fixed interfaces. The driver chip can be connected to the display screen via a data cable and the aforementioned interfaces. In this case, the driver chip can be considered a device independent of the display screen.

[0044] To understand the technical solutions provided in the embodiments of this application, the specific structures of the current compensation module, constant current module and driving module in the driver chip will be described below in conjunction with the embodiments.

[0045] I. Current Compensation Module

[0046] The number of current compensation modules can be set according to the structure of the drive module. For example, when the drive module includes multiple switching devices coupled to the power supply, and these switching devices are connected in different positions within the drive module, the required bias voltage varies depending on the location of the switching devices. To ensure the normal operation of the drive chip, a current compensation module with the same number of switching devices can be configured.

[0047] The current compensation module mainly consists of two branches: the first branch and the second branch. (See also...) Figure 2As shown, the first end of the first branch is connected to the power supply, and the second end of the first branch is grounded through the constant current module. The first end of the second branch is connected to the power supply, and the second end of the second branch is grounded. That is, the first branch and the constant current module are connected in series and then in parallel with the second branch. The second branch includes switching devices that correspond one-to-one with each switching device in the first branch, and the control terminal of each switching device in the second branch is connected to the control terminal of the corresponding switching device in the first branch.

[0048] The function of connecting the first branch in series with the constant current module is to maintain the current amplitude of the devices in the first branch at a constant value, which is the first current provided by the constant current module to the first branch.

[0049] In some implementations, the first branch may include a first switching device and a second switching device, and the second branch may include a third switching device, a fourth switching device, and a fifth switching device. Specifically, the first and third switching devices correspond to each other, and the second and fourth switching devices correspond to each other.

[0050] Specifically, the first terminal of the first switching device is connected to the power supply, the second terminal of the first switching device is connected to the first terminal of the second switching device, and the control terminal of the first switching device is connected to the control terminal of the corresponding switching device in the second branch.

[0051] The second terminal of the second switching device is connected to the control terminal of the constant current module and the second switching device, and the control terminal of the second switching device is connected to the control terminal of the corresponding switching device in the second branch.

[0052] The first terminal of the third switching device is connected to the power supply, the second terminal of the third switching device is connected to the first terminal of the fourth switching device, and the control terminal of the third switching device is connected to the control terminal of the first switching device and the second terminal of the third switching device.

[0053] The first terminal of the fourth switching device is connected to the control terminal of a switching device in the drive module; the second terminal of the fourth switching device is connected to the first terminal of the fifth switching device; the control terminal of the fourth switching device is connected to the control terminal of the second switching device; the second terminal of the fifth switching device is grounded; and the control terminal of the fifth switching device is connected to the first terminal of the fifth switching device.

[0054] In practical applications, the switching devices in the first and second branches can be either P-channel or N-channel MOSFETs. Taking a P-channel MOSFET as an example, the first terminal of the switching device in the first and second branches can be the drain of the MOSFET, the control terminal can be the gate of the MOSFET, and the second terminal can be the source of the MOSFET. Of course, other switching devices with the above functions can also be used in the first and second branches; this application does not impose further limitations on this.

[0055] To facilitate understanding, a specific example of the current compensation module structure is given below.

[0056] See Figure 3 The diagram shown is a structural schematic of a current compensation module provided in an embodiment of this application. Figure 3 In this configuration, MOSFET Q1 can be considered the first switching device, MOSFET Q2 the second, MOSFET Q3 the third, MOSFET Q4 the fourth, and MOSFET Q5 the fifth. The second terminal of MOSFET Q2 serves as the input terminal of the current compensation module, receiving the first current output from the constant current module. The gates of MOSFET Q2 and Q4 serve as the output terminals of the current compensation module, connected to the control terminal of one of the switching devices in the drive module, and providing it with a bias voltage.

[0057] use Figure 3When the current compensation module provides bias voltage to the switching devices in the drive module, the power supply is shared by both the current compensation module and the drive module. Therefore, if the power supply voltage drops, the voltage amplitude received at the first terminal of the switching device in the drive module decreases. Since MOSFETs Q1 and Q2 are connected in series with the constant current module, in order to maintain the current on MOSFETs Q1 and Q2 at the first current output of the constant current module, the voltage at the second terminal of MOSFET Q1 and the gate, drain, and source terminals of MOSFET Q2 all decrease. This causes the gate voltage of MOSFET Q4 corresponding to MOSFET Q2 to also decrease. Therefore, the voltage difference between the gate and drain of MOSFET Q4 increases, the conduction degree of MOSFET Q4 increases, and the current amplitude flowing through MOSFET Q4 increases. Furthermore, since MOSFET Q4 is connected in series with MOSFET Q3, and the power supply connected to the first terminal of MOSFET Q3 decreases, the current of MOSFET Q3 decreases. Since the increased current of MOSFET Q4 is provided by the control terminal capacitor of the switching device in the connected drive module, when the control terminal of the switching device in the drive module provides current, the control terminal voltage of the switching device in the drive module that is directly or indirectly connected to the power supply also decreases. Therefore, the voltage difference between the first terminal and the control terminal of the switching device in the drive module increases, thereby maintaining the driving power of the drive module when the power supply voltage decreases.

[0058] use Figure 3 When the current compensation module provides bias voltage to the switching devices in the drive module, as the power supply voltage rises, since MOSFETs Q1 and Q2 are connected in series with the constant current module, in order to maintain the current on MOSFETs Q1 and Q2 at the first current output of the constant current module, the port voltages of the gate, source, and drain of MOSFETs Q1 and Q2 all rise accordingly. This causes the gate voltage of MOSFET Q4, corresponding to MOSFET Q2, to also rise. Therefore, the voltage difference between the gate and the first terminal of MOSFET Q4 decreases, the conduction degree of MOSFET Q4 decreases, and the current amplitude flowing through MOSFET Q4 decreases. Furthermore, because MOSFETs Q4 and Q3 are connected in series, and the power supply connected to the first terminal of MOSFET Q3 rises, the current of MOSFET Q3 increases. Therefore, a portion of the current in MOSFET Q3 charges the control terminal capacitor of the switching devices in the drive module, raising the control terminal potential of the switching devices, maintaining the driving power of the drive module, and ensuring the display effect of the display device.

[0059] In some implementations, if the driver chip is used in a display with a high refresh rate, the voltage drop rate at the control terminal of the switching device in the driver module needs to meet the refresh rate requirements of the display. To improve the voltage drop rate at the control terminal of the switching device, see [link to relevant documentation]. Figure 4As shown, the second branch in the current compensation module may also include a current-limiting resistor R connecting the third and fourth switching devices.

[0060] like Figure 4 As shown, when the power supply voltage drops, causing the current on the fourth switching device Q4 to increase, the current-limiting effect of the current-limiting resistor R reduces the voltage difference between the drain and drain terminals of the third switching device Q3. Consequently, the source-drain current of the third switching device decreases. The increased current of the fourth switching device Q4 is mainly provided by the control terminal capacitor of the switching device in the drive module, which causes the control terminal voltage of the switching device in the drive module to drop faster, thereby increasing the driving speed of the drive module and meeting the high refresh rate requirements of the display screen.

[0061] In practical applications, a resistor can be selected as the current-limiting resistor, such as... Figure 5 As shown, multiple resistors can also be connected in series as a current-limiting resistor.

[0062] It should be noted that, Figures 3 to 5 The first branch structure shown, which includes two switching devices, is only an example. In actual use, the first branch may include two or more switching devices. This application does not impose any restrictions here.

[0063] II. Constant Current Module

[0064] The constant current module can be connected to the first branch in each current compensation module and provide the first current to the connected first branch.

[0065] In practical applications, if each current compensation module provides bias voltage to switching devices at different locations in the drive module, the required bias voltage amplitude for the switching devices connected to each current compensation module may be different. In order to ensure that the operation of multiple current compensation modules does not affect each other, the constant current module may include a current source and a current mirror circuit corresponding to each current compensation module. Each current mirror circuit is connected to the first branch in the corresponding current compensation module, and each current mirror circuit is used to provide a first current to the first branch connected to it.

[0066] In one example, each current mirror circuit outputs the same current amplitude.

[0067] In another example, each current mirror circuit outputs the same current amplitude. In this case, different sizes of switching devices can be configured for the first and second branches in each current compensation module. Therefore, when the power supply drops, each current compensation module can provide a bias voltage of different amplitudes for the connected switching devices.

[0068] In some implementations, each current mirror circuit includes a sixth switching device, a seventh switching device, an eighth switching device, and a ninth switching device.

[0069] Specifically, the first terminal of the sixth switching device is connected to the current source, the second terminal of the sixth switching device is connected to the first terminal of the seventh switching device, and the control terminal of the sixth switching device is connected to the control terminal of the eighth switching device; the first terminal of the seventh switching device is connected to the control terminal of the seventh switching device, the second terminal of the seventh switching device is grounded, and the control terminal of the seventh switching device is connected to the control terminal of the ninth switching device; the first terminal of the eighth switching device is connected to the first branch in the corresponding current compensation module, the second terminal of the eighth switching device is connected to the first terminal of the ninth switching device; and the second terminal of the ninth switching device is grounded.

[0070] To facilitate understanding, a specific example of the current mirror circuit structure is given below.

[0071] See Figure 6 The diagram shown is a schematic representation of a current mirror circuit provided in an embodiment of this application. Figure 6 In this circuit, MOSFET Q6 can be considered the sixth switching device, MOSFET Q7 the seventh, Q8 the eighth, and Q9 the ninth. The first terminal of Q6 can serve as the input terminal of the current mirror circuit, receiving the current output from the current source. The first terminal of Q8 can serve as the output terminal of the current mirror circuit, connecting to the corresponding current compensation module.

[0072] use Figure 6 When the current mirror circuit shown provides current to the corresponding current compensation module, the current mirror circuit converts the current output from the current source according to a fixed ratio and outputs it to the corresponding current compensation module, thereby maintaining a fixed current in the first branch of the connected current compensation module.

[0073] It should be noted that the structure of the constant current module described above is only an example. In actual use, other devices with the above functions can be selected for the constant current module. For example, the constant current module can be implemented using a chip with a fixed output current and peripheral circuitry.

[0074] III. Driver Module

[0075] Each driving module can be connected to one or more light-emitting devices of the display device and is used to drive the connected light-emitting devices to emit light and adjust the brightness of the light-emitting devices.

[0076] For practical applications, please refer to Figure 7As shown, when a driver chip includes multiple current compensation modules, each current compensation module can be connected to all driver modules in the driver chip. Specifically, each current compensation module can be connected to the control terminal of a switching device at the same location in multiple driver modules, and provide a discharge path for the control terminal capacitor of the switching device, thereby maintaining the stability of the current or voltage amplitude output by the driver module when the power supply voltage drops. For example, the switching device directly connected to the power supply in each driver module can be a switching device at the same location.

[0077] The structure of each driving module can be configured according to the electronic device to which the display device belongs; this electronic device can be any electronic device with display functionality. For example, see... Figure 8 The diagram shown illustrates one possible structure of a driver module when the electronic device is a laptop. The driver module can be connected to an external fixed power source and can receive drive control signals. Of course, driver modules can have other structures, which are not limited here.

[0078] join Figure 8 As shown, when the power supply voltage drops, the drain voltage of the switching devices connected to the power supply in the drive module, as well as the drain voltage of the switching devices connected to the power supply through other switching devices, will drop. By configuring the current compensation module corresponding to each switching device, the control terminal voltage of the switching device can also drop, thereby maintaining the current amplitude or voltage amplitude in the drive module, and thus maintaining the driving power of the drive module.

[0079] In practical applications, the number of driver modules in a driver chip can be configured according to the number of light-emitting devices in an electronic device, which will not be discussed in detail here.

[0080] In practical applications, in addition to the aforementioned components, the driver chip may also include other functional circuits. For example, the driver chip may also include a display signal generation circuit, which is used to control the display pattern on the display panel. Taking a driver chip that includes a current compensation module as an example, the structure of the driver chip can be found in [reference needed]. Figure 9 As shown.

[0081] Based on the same inventive concept, embodiments of this application also provide a display device that can be applied to electronic devices with display functions. See also Figure 10 As shown, the display device may include a power supply, multiple light-emitting devices, and the aforementioned driver chip.

[0082] In some implementations, both the power supply and the driver chip are equipped with external interfaces, through which the power supply and the driver chip can be connected.

[0083] In some implementations, the power supply is located on the driver chip.

[0084] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions between different embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0085] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of protection of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A driving chip, characterized in that, The application relates to a constant current module, at least one current compensation module and a plurality of drive modules. The constant current module is connected with a first branch of the at least one current compensation module, and is used for providing a first current for the first branch of the at least one current compensation module. The at least one current compensation module comprises the first branch and a second branch, a first end of the first branch and a first end of the second branch are used for being connected with a power supply, a second end of the first branch is grounded through the constant current module, and a second end of the second branch is grounded. The plurality of drive modules are connected with the at least one current compensation module, and the drive modules are used for being connected with the power supply and a light emitting device and driving the light emitting device to emit light. The first branch comprises a plurality of switch devices connected in series between the power supply and the constant current module, the second branch comprises a switch device corresponding to each switch device in the first branch, a control end of each switch device in the first branch is connected with a control end of the corresponding switch device in the second branch, and a target node of the second branch is connected with a control end of a switch device in each drive module, the target node is a connecting point between two adjacent switch devices in the second branch. The first branch comprises a first switch device and a second switch device.

2. The chip according to claim 1, characterized in that, A first end of the first switch device is connected with the power supply, a second end of the first switch device is connected with a first end of the second switch device, and a control end of the first switch device is connected with a control end of the corresponding switch device in the second branch. A second end of the second switch device is connected with the constant current module and a control end of the second switch device, and a control end of the second switch device is connected with a control end of the corresponding switch device in the second branch. The second branch comprises a third switch device, a fourth switch device and a fifth switch device.

3. The chip of claim 2, wherein, A first end of the third switch device is connected with the power supply, a second end of the third switch device is connected with a first end of the fourth switch device, and a control end of the third switch device is connected with the second end of the third switch device and the control end of the first switch device. A first end of the fourth switch device is connected with a control end of a switch device in the drive module, a second end of the third switch device is connected with a first end of the fifth switch device, and a control end of the fourth switch device is connected with a control end of the second switch device. A second end of the fifth switch device is grounded, and a control end of the fifth switch device is connected with the first end of the fifth switch device. The second branch further comprises a current-limiting resistor connected between the third switch device and the fourth switch device.

4. The chip of claim 3, wherein The constant current module comprises a current source and a current mirror circuit corresponding to each current compensation module in the at least one current module, each current mirror circuit is connected with the first branch in the corresponding current compensation module, and each current mirror circuit is used for providing the first current for the connected first branch.

5. The chip according to claim 1 or 2, characterized by Each current mirror circuit comprises a sixth switch device, a seventh switch device, an eighth switch device and a ninth switch device.

6. The chip of claim 5, wherein, ​ The first end of the sixth switch device is connected with the current source, the second end of the sixth switch device is connected with the first end of the seventh switch device, and the control end of the sixth switch device is connected with the control end of the eighth switch device; The first end of the seventh switch device is connected with the control end of the seventh switch device, the second end of the seventh switch device is grounded, and the control end of the seventh switch device is connected with the control end of the ninth switch device; The first end of the eighth switch device is connected with the first branch in the corresponding current compensation module, and the second end of the eighth switch device is connected with the first end of the ninth switch device; The second end of the ninth switch device is grounded.

7. The chip according to claim 1 or 2, characterized by The first current amplitude output by each current mirror circuit is different.

8. The chip according to claim 1 or 2, characterized by The sizes of the switch devices in the first branch and the second branch of each current compensation module are different.

9. The chip according to claim 1 or 2, characterized by The control ends of different switch devices in the driving module are connected with each current compensation module, and the switch devices connected with each current compensation module are coupled with the power supply.

10. A display device, characterized by comprising: It comprises: A power supply and a plurality of light emitting devices driven by the driving chip according to any one of claims 1 to 9.

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