Reference voltage compensation device, compensation method and display device for display panel

Abstract

This invention discloses a reference voltage compensation device, compensation method, and display device for a display panel. The reference voltage compensation device for the display panel includes: a memory, the memory storing data including a target register value; a driver chip connected to the memory to acquire the stored data; the driver chip includes a voltage compensation module, which is used to compensate the reference voltage in the display panel according to the acquired target register value. The technical solution provided by this invention improves the display effect of the display panel.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display, and in particular to a reference voltage compensation device, a compensation method and a display device of a display panel. BACKGROUND

[0002] With the development of display technology, people have higher and higher requirements for display picture quality.

[0003] In the existing organic light emitting display panel, the display picture of the display panel has a water wave phenomenon, which affects the display effect of the display panel. SUMMARY

[0004] Embodiments of the present application provide a reference voltage compensation device, a compensation method and a display device of a display panel to improve the display effect of the display panel.

[0005] According to an aspect of the present application, a reference voltage compensation device of a display panel is provided, comprising:

[0006] a memory, the storage data in the memory comprising a target register value;

[0007] a driving chip connected with the memory to obtain the storage data in the memory; the driving chip comprising a voltage compensation module, the voltage compensation module being configured to compensate a reference voltage in the display panel according to the obtained target register value.

[0008] Optionally, the voltage compensation module comprises:

[0009] a bias current generating unit configured to output a corresponding bias current according to the obtained target register value;

[0010] a voltage compensation unit configured to output a compensated reference voltage according to an initial reference voltage and a voltage drop of a power supply voltage under the bias current.

[0011] Optionally, the reference voltage comprises a first reference voltage and a second reference voltage; the first reference voltage is greater than the second reference voltage; and the voltage compensation unit comprises:

[0012] a first compensation unit configured to output a compensated first reference voltage according to an initial first reference voltage and a voltage drop of a power supply voltage under the bias current.

[0013] a second compensation unit configured to output a compensated second reference voltage according to an initial second reference voltage and a voltage drop of a power supply voltage under the bias current.

[0014] Optionally, the first compensation unit and / or the second compensation unit comprises:

[0015] a first resistor, a second resistor, a third resistor, a fourth resistor, a control switch and an amplifier;

[0016] a positive input terminal of the amplifier is electrically connected with a second terminal of the first resistor and a second terminal of the second resistor; a first terminal of the first resistor inputs a reference voltage; a first terminal of the second resistor is electrically connected with a first terminal of the control switch; the first terminal of the second resistor inputs a power supply voltage detected at a target circuit;

[0017] a negative input terminal of the amplifier is electrically connected with a second terminal of the third resistor and a first terminal of the fourth resistor; a first terminal of the third resistor is electrically connected with a second terminal of the control switch; the first terminal of the third resistor inputs a power supply voltage without voltage drop; a control terminal of the control switch is used for receiving a control signal;

[0018] an output terminal of the amplifier is electrically connected with a second terminal of the fourth resistor.

[0019] Optionally, the driving chip further comprises:

[0020] a control module, the control module is used for generating an interrupt instruction when the display panel enters at least one state of a display mode and a sleep mode;

[0021] a random access storage module, connected with the control module, the voltage compensation module and the memory, the random access storage module is used for obtaining a target register value stored in the memory and sending the target register value to the voltage compensation module after receiving the interrupt instruction sent by the control module;

[0022] Preferably, the driving chip further comprises:

[0023] a one-time programming storage module; storage data of the one-time programming storage module comprises an original register value; the one-time programming storage module is used for stopping sending the original register value to the voltage compensation module after receiving the interrupt instruction.

[0024] Optionally, the driving chip further comprises:

[0025] a cyclic redundancy check module, connected with the random access storage module, the cyclic redundancy check module is used for checking data obtained from the memory by the random access storage module, and controlling the random access storage module to obtain data from the memory again when the checking fails;

[0026] Preferably, the data of the cyclic redundancy check comprises gamma data.

[0027] According to another aspect of the present invention, a reference voltage compensation method for a display panel is provided, comprising:

[0028] The memory stores the target register value;

[0029] The voltage compensation module compensates the reference voltage in the display panel according to the acquired target register value; the voltage compensation module is located in the driver chip, which is connected to the memory to acquire the stored data in the memory.

[0030] Optionally, the voltage compensation module includes a bias current generation unit and a voltage compensation unit; the voltage compensation module compensates the reference voltage in the display panel according to the acquired target register value, including:

[0031] The bias current generating unit generates a corresponding bias current based on the acquired target register value;

[0032] The voltage compensation unit outputs a compensated reference voltage based on the initial reference voltage and the voltage drop of the power supply voltage under the bias current.

[0033] Optionally, the driver chip further includes: a control module and a random access memory module; the random access memory module is connected to the control module, the voltage compensation module, and the memory; the reference voltage compensation method for the display panel further includes:

[0034] The control unit generates an interrupt command when the display panel is in at least one of the states of being in display mode and exiting sleep mode.

[0035] After receiving an interrupt command from the control module, the random access memory module obtains the target register value stored in the memory and sends the target register value to the voltage compensation module.

[0036] Preferably, the driver chip further includes: a one-time programming memory module; the stored data in the one-time programming memory module includes the original register values;

[0037] The reference voltage compensation method for the display panel also includes:

[0038] Upon receiving the interrupt instruction, the one-time programming storage module stops sending the original register value to the voltage compensation module;

[0039] Preferably, the driver chip further includes a cyclic redundancy check module, which is connected to the random access memory module; the reference voltage compensation method for the display panel further includes:

[0040] The cyclic redundancy check module checks the data retrieved from the memory by the random access storage module, and if the check fails, controls the random access storage module to retrieve the data from the memory again.

[0041] According to another aspect of the present invention, a display device is provided, including a display panel and a reference voltage compensation device for the display panel as described in any embodiment of the present invention.

[0042] This invention provides a reference voltage compensation device, compensation method, and display device for a display panel. The reference voltage compensation device includes: a memory containing target register values; and a driver chip connected to the memory. The driver chip includes a voltage compensation module, which compensates for the reference voltage in the display panel based on the acquired target register values. The technical solution provided by this invention, by storing the target register values ​​of the voltage compensation module (ELVDD AVC module) in the memory, writes the stored target register values ​​to the voltage compensation module in the driver chip (DDIC) when the display panel enters display mode or exits sleep mode, thereby overwriting the initial register values ​​burned into the driver chip. This improves the water ripple problem on the display screen and enhances the display effect of the display panel.

[0043] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a structural block diagram of a reference voltage compensation device for a display panel provided in an embodiment of the present invention;

[0046] Figure 2 This is a circuit diagram of a voltage compensation unit provided in an embodiment of the present invention;

[0047] Figure 3 This is a structural block diagram of another reference voltage compensation device for a display panel provided in an embodiment of the present invention;

[0048] Figure 4This is a flowchart of a reference voltage compensation method for a display panel provided in an embodiment of the present invention;

[0049] Figure 5 This is a flowchart of another reference voltage compensation method for a display panel provided in an embodiment of the present invention;

[0050] Figure 6 This is a flowchart of another reference voltage compensation method for a display panel provided in an embodiment of the present invention;

[0051] Figure 7 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0052] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0053] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0054] As mentioned in the background technology, the display panel exhibits a ripple effect on the screen, affecting its display quality. The power management chip (PMIC) generates a power supply voltage (e.g., ELVDD) based on the signal to be displayed. The reference voltages VGMP (gamma high voltage) and VGSP (gamma low voltage) in the display panel are obtained from the output value of the power supply voltage and output to the source driver. The source driver then drives each pixel of the display panel to display based on the reference voltages VGMP and VGSP. Because the traces from the PMIC to the display panel are relatively long and have high resistance, the voltage drop of the power supply voltage (e.g., ELVDD) is correspondingly large. In related technologies, an ELVDD AVC (Adaptive VGMP Control, voltage compensation function) module is incorporated into the display driver IC (DDIC). This module detects the voltage drop across the ELVDD traces and compensates for the voltage drop of VGMP and VGSP accordingly. For example, if ELVDD is detected to decrease by 0.1V, then VGMP and VGSP will decrease by 0.1V respectively; or decrease by a coefficient, such as a coefficient of 0.5, then VGMP and VGSP will decrease by 0.05V respectively.

[0055] The accuracy of the ELVDD AVC module in detecting the ELVDD voltage drop is determined by the magnitude of the bias current IB. The ELVDD AVC module (register) can output the corresponding bias current IB based on the value set in the register; for example, Reg1 represents an output current of 2uA, and Reg2 represents an output current of 4uA. If the register value provided to the ELVDD AVC module is inappropriate, meaning the magnitude of the generated bias current IB is not set correctly, the ELVDD AVC module's detection of the ELVDD trace voltage drop and its compensation of the VGMP / VGSP voltages will be either too sensitive or too insensitive. This will cause periodic fluctuations in the compensated first reference voltage VGMP and second reference voltage VGSP, ultimately resulting in a wavy pattern on the display panel.

[0056] Currently, the detection accuracy settings of the ELVDD AVC module in DDIC can be divided into four levels: 0.5uA / 1uA / 2uA / 4uA. When the ELVDD AVC register is set to one of these values ​​(e.g., Reg1: 2uA), it is stored in DDIC via OTP (One Time Programmable). If Reg1 is not applicable to all screens at this time, and the value of Reg1 will not be modified if it is not re-OTP after being stored in DDIC, then screens that do not use the register value stored in DDIC will have a water ripple display problem.

[0057] Therefore, embodiments of the present invention provide a reference voltage compensation device for a display panel. Figure 1 This is a structural block diagram of a reference voltage compensation device for a display panel provided in an embodiment of the present invention. Figure 1 The reference voltage compensation device for the display panel includes:

[0058] Memory 10, the stored data in memory 10 includes the target register value;

[0059] The driver chip 20 is connected to the memory 10 to obtain the stored data in the memory; the driver chip 20 includes a voltage compensation module 21, which is used to compensate the reference voltage in the display panel according to the obtained target register value.

[0060] Specifically, memory 10 can be a Flash (or Nand-flash) IC; however, those skilled in the art can choose according to the actual situation. The stored data in memory 10 includes the target register value. Driver chip 20 is a display driver chip (DDIC), connected to memory 10, and can obtain the stored target register value from memory 10. Driver chip 20 and memory 10 can be connected via a Serial Peripheral Interface (SPI).

[0061] The driver chip 20 includes a voltage compensation module 21, namely the aforementioned ELVDD AVC module. The voltage compensation module 21 can obtain a target register value from the memory 10 and then generate a bias current IB based on that target register value. The target register value can be understood as a register value applicable to the current screen. Under the action of the bias current IB generated based on the target register value, the voltage compensation module 21 performs voltage drop detection on the ELVDD traces and compensates for the reference voltage, thereby improving or even eliminating the water ripple problem on the display panel.

[0062] The technical solution provided by the present invention stores the target register value of the voltage compensation module 21 in the memory 10. When the display panel enters the display mode or exits the sleep mode, the target register value stored in the memory 10 is written to the voltage compensation module 21 in the driver chip 20 (DDIC) to overwrite the initial register value burned into the driver chip 20, thereby improving the water ripple problem of the display screen and improving the display effect of the display panel.

[0063] Based on this, the stored data in memory 10 can also include gamma data, demura data, etc. Driver chip 20 is connected to memory 10 and can obtain the stored data from memory 10. Related technologies use memory 10 in a rudimentary way; for example, only gamma compensation data is stored in memory 10 via a serial peripheral interface (SPI), while gamma data and register data from the voltage compensation module are stored in driver chip 20 via OTP. This embodiment of the invention can directly store gamma data and register data from the voltage compensation module in page address units in memory 10 outside of driver chip 20, thereby achieving fine-grained management of memory 10. At the same time, it utilizes the high-speed write speed of memory 10, keeping its write time essentially comparable to that of driver chip 20 using OTP storage in related technologies.

[0064] Meanwhile, storing large amounts of data directly through the external memory 10 of the driver chip 20 increases the utilization efficiency of the driver chip 20, theoretically enabling countless data writes, thereby saving costs; and the hardware cost of the memory 10 used is far lower than the hardware cost generated by the increase in the size of the driver chip 20, thereby effectively reducing the size of the driver chip 20, lowering hardware costs, and improving the performance of the AMOLED display panel.

[0065] Optionally, the memory 10 may store multiple register values ​​to provide adapted target register values ​​for various display panels.

[0066] Based on the above embodiments, optionally, the voltage compensation module 21 includes:

[0067] The bias current generation unit is used to output the corresponding bias current according to the acquired target register value.

[0068] The voltage compensation unit is used to output a compensated reference voltage based on the initial reference voltage and the voltage drop of the power supply voltage under bias current.

[0069] Specifically, the reference voltage includes a first reference voltage and a second reference voltage; the first reference voltage is greater than the second reference voltage; the first reference voltage is VGMP, and the second reference voltage is VGSP. The voltage compensation unit includes two units: a first compensation unit and a second compensation unit. The first compensation unit outputs a compensated first reference voltage based on the initial first reference voltage (uncompensated first reference voltage) and the voltage drop across the power supply under bias current. The second compensation unit outputs a compensated second reference voltage based on the initial second reference voltage (uncompensated second reference voltage) and the voltage drop across the power supply under bias current.

[0070] Figure 2 This is a circuit diagram of a voltage compensation unit provided in an embodiment of the present invention, for reference. Figure 2 Each voltage compensation unit includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a control switch K, and an amplifier 211. The positive input terminal of amplifier 211 is electrically connected to the second terminals of the first and second resistors R1 and R2; the first terminal of the first resistor R1 receives the uncompensated reference voltage; the first terminal of the second resistor R2 is electrically connected to the first terminal of the control switch K; the first terminal of the second resistor R2 receives the power supply voltage ELVDD_AVC detected at the target circuit; the negative input terminal of amplifier 211 is electrically connected to the second terminals of the third resistor R3 and R4; the first terminal of the third resistor R3 is electrically connected to the second terminal of the control switch K; the first terminal of the third resistor R3 receives the power supply voltage ELVDD without voltage drop; the control terminal of the control switch K receives the control signal ELVDD_AVC_ENB; the output terminal of amplifier 211 is electrically connected to the second terminal of the fourth resistor R4, and the output terminal of amplifier 211 outputs the compensated reference voltage.

[0071] In the first compensation unit, the first terminal of the first resistor R1 receives the uncompensated first reference voltage VGMP, and the output terminal of amplifier 211 outputs the compensated first reference voltage VGMP_Tracking. In the second compensation unit, the first terminal of the first resistor R1 receives the uncompensated second reference voltage VGSP, and the output terminal of amplifier 211 outputs the compensated second reference voltage VGSP_Tracking.

[0072] The target circuit can be a pixel circuit. The actual power supply voltage at the target circuit is the voltage value at the power signal (ELVDD) input terminal of the pixel circuit. The power supply voltage without voltage drop is the voltage value at the output terminal of the power management chip. The difference between the output value and the actual value of the power supply voltage is the voltage difference ΔELVDD between the output terminal of the power management chip and the power signal input terminal of the pixel circuit.

[0073] Of course, the target circuit can also be other circuits in the display panel, as long as it needs to compensate for the difference between the output value and the actual value of the power supply voltage, the voltage compensation unit design in this application can be applied, and there is no limitation here. For example, the target circuit can be a GOA circuit. By compensating for the difference between the output value of the power supply voltage and the actual value of the power supply voltage of the GOA circuit, it is possible to avoid the abnormality of some GOA circuits due to excessive voltage drop of the power supply voltage, which would affect the relevant control of each pixel of the display panel.

[0074] Based on the above embodiments, optionally, Figure 3 This is a structural block diagram of another reference voltage compensation device for a display panel provided in an embodiment of the present invention. Figure 3 The driver chip 20 also includes:

[0075] Control module 22 is used to generate an interrupt command when the display panel enters display mode or exits sleep mode.

[0076] The random access memory module 23 is connected to the control module 22, the voltage compensation module 21, and the memory 10. After receiving an interrupt instruction sent by the control module 22, the random access memory module 23 obtains the target register value stored in the memory 10 and sends the target register value to the voltage compensation module 21.

[0077] Specifically, the MIPI protocol control commands for the display panel include 11h (sleep out, driver chip 20 exits sleep mode), 29h (display on, driver chip 20 displays normally), 10h (sleep in, driver chip 20 enters sleep mode), and 28h (display off, driver chip 20 turns off display). After receiving the 11h and 29h commands, the control module 22 generates an interrupt command to control the random access memory module 23 to retrieve the data stored in the memory 10 for display use. The random access memory module 23 is the RAM (Random Access Memory) module in the driver chip 20. The driver chip 20 also includes a one-time programming memory module 24; the data stored in the one-time programming memory module 24 includes the original register values; the one-time programming memory module 24 is used to stop sending the original register values ​​to the voltage compensation module 21 after receiving the interrupt command. When the driver chip 20 is powered off, the register values ​​received by the ELVDD AVC module are still the initial register values. In this embodiment of the invention, after the control module 22 receives the 11h and 29h instructions, it controls the random access memory module 23 to transfer the target register value in the memory 10 to the random access memory module 23 of the DDIC, and sends the target register value to the ELVDD AVC module to overwrite the original register value (initial register value), thereby improving the water ripple problem.

[0078] Based on the above embodiments, alternative options are available; please continue to refer to them. Figure 3 The driver chip 20 also includes a cyclic redundancy check module 25; the cyclic redundancy check module 25 is connected to the random access memory module 23, and the cyclic redundancy check module 25 is used to check the data obtained by the random access memory module 23 from the memory 10, and when the check fails, it controls the random access memory module 23 to retrieve the data from the memory 10 again.

[0079] Specifically, CRC (Cyclic Redundancy Check) is a commonly used verification method in data transmission. It calculates a checksum of a certain length by processing the data and appends this checksum to the data for transmission. The principle of CRC verification is to treat the data as a binary string and perform a series of shift, XOR, and other operations on this binary string to obtain a checksum of a specified length. When receiving data, the receiving end also performs CRC calculation. If the calculated checksum matches the received checksum, the data transmission is considered error-free; otherwise, an error is considered to have occurred. To prevent interference to the target register value during DDIC operation, such as ESD interference, a CRC check can be performed on the gamma data stored in RAM in the first frame of the display panel, and also on the gamma data stored in RAM in subsequent display frames. If the calculated checksum differs from the received checksum, the check fails, and the stored data must be retrieved from the Flash IC again.

[0080] This invention also provides a reference voltage compensation method for a display panel, which is executed by the reference voltage compensation device for the display panel described in any of the above embodiments; Figure 4 This is a flowchart of a reference voltage compensation method for a display panel provided in an embodiment of the present invention. Figure 4 The reference voltage compensation methods for the display panel include:

[0081] S110, the memory stores the target register value.

[0082] S120, the voltage compensation module compensates the reference voltage in the display panel according to the acquired target register value; the voltage compensation module is located in the driver chip, which is connected to the memory to acquire the stored data in the memory.

[0083] Specifically, the memory can be a Flash (or Nand-flash) IC; of course, those skilled in the art can choose according to the actual situation. The target register value is stored in the memory. The driver chip is a display driver chip (DDIC), connected to the memory, and can obtain the stored target register value from the memory. The driver chip includes a voltage compensation module, namely the aforementioned ELVDD AVC module. The voltage compensation module can replace the initial register value stored in the driver chip with the target register value obtained from the memory, and then generate a bias current IB based on the target register value. The target register value can be understood as a register value applicable to the screen. Under the action of the bias current IB generated based on the target register value, the voltage compensation module performs voltage drop detection on the ELVDD traces and compensates for the reference voltage, which can improve the problem of water ripples on the display panel, and even eliminate the water ripples on the display panel.

[0084] Optionally, the voltage compensation module includes a bias current generation unit and a voltage compensation unit; step S120: the voltage compensation module obtains the target register value and compensates the reference voltage in the display panel according to the target register value, including:

[0085] The bias current generation unit generates the corresponding bias current based on the acquired target register value;

[0086] The voltage compensation unit outputs a compensated reference voltage based on the initial reference voltage and the voltage drop of the power supply voltage under bias current.

[0087] Optionally, the driver chip may also include a control module and a random access memory module; the random access memory module is connected to the control module, the voltage compensation module, and the memory. Figure 5 This is a flowchart of another reference voltage compensation method for a display panel provided in an embodiment of the present invention. Before step S120, where the voltage compensation module obtains the target register value and compensates the reference voltage in the display panel according to the target register value, the reference voltage compensation method for the display panel further includes:

[0088] S1201 The control unit generates an interrupt command when the display panel is in at least one of the states of entering display mode and exiting sleep mode.

[0089] S1202. After receiving the interrupt instruction sent by the control module, the random access memory module obtains the target register value stored in the memory and sends the target register value to the voltage compensation module.

[0090] Optionally, the driver chip also includes a one-time programming memory module; the stored data in the one-time programming memory module includes the original register values; after the control unit generates an interrupt instruction in at least one of the states where the display panel enters display mode and exits sleep mode, the reference voltage compensation method for the display panel further includes:

[0091] Once the programmable memory module receives an interrupt command, it stops sending the original register values ​​to the voltage compensation module.

[0092] Preferably, the driver chip further includes a cyclic redundancy check module, which is connected to the random access memory module. Figure 6 This is a flowchart of another reference voltage compensation method for a display panel provided in an embodiment of the present invention. Figure 6 After the voltage compensation module obtains the target register value in step S120 and compensates the reference voltage in the display panel according to the target register value, the reference voltage compensation method for the display panel further includes:

[0093] S130, the cyclic redundancy check module checks the data retrieved from the memory by the random access memory module, and if the check fails, controls the random access memory module to retrieve the data from the memory again.

[0094] Figure 7 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention, for reference. Figure 7 This invention also provides a display device, including a display panel 100 and a reference voltage compensation device 200 as described in any embodiment of this invention. It has the same technical effects and will not be repeated here.

[0095] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A reference voltage compensation device of a display panel, characterized by, The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. 2.The reference voltage compensation apparatus of the display panel according to claim 1, wherein, The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method.

3. The reference voltage compensation apparatus of claim 2, wherein The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method.

4. The reference voltage compensation apparatus of claim 3, wherein The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method.

5. The reference voltage compensation apparatus of claim 1, wherein The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method.

6. The reference voltage compensation apparatus of claim 5, wherein The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. The application relates to a display driving chip and a display driving method. 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7. The reference voltage compensation apparatus of claim 6, wherein The cyclic redundancy check data includes gamma data.

8. A reference voltage compensation method of a display panel, characterized by, The method comprises the following steps: The memory stores a target register value; A voltage compensation module compensates a reference voltage in a display panel according to the obtained target register value; The voltage compensation module is located in a driving chip connected with the memory to obtain the stored data in the memory; The driving chip further comprises a control module and a random access storage module; the random access storage module is connected with the control module, the voltage compensation module and the memory; the reference voltage compensation method of the display panel further comprises the following steps: A control unit generates an interrupt instruction when the display panel enters at least one state of a display mode and a sleep mode; The random access storage module obtains a target register value stored in the memory and sends the target register value to the voltage compensation module after receiving the interrupt instruction sent by the control module. 9.The reference voltage compensation method of display panel according to claim 8, characterized in that, The voltage compensation module comprises a bias current generation unit and a voltage compensation unit; the voltage compensation module compensates the reference voltage in the display panel according to the obtained target register value, which comprises the following steps: The bias current generation unit generates a corresponding bias current according to the obtained target register value; The voltage compensation unit outputs a compensated reference voltage according to an initial reference voltage and a voltage drop of a power supply voltage under the bias current.

10. The reference voltage compensation method of a display panel according to claim 8, wherein, The driving chip further comprises a one-time programming storage module; the stored data of the one-time programming storage module comprises an original register value; The reference voltage compensation method of the display panel further comprises the following steps: The one-time programming storage module stops sending the original register value to the voltage compensation module after receiving the interrupt instruction.

11. The reference voltage compensation method of a display panel according to claim 10, wherein The driving chip further comprises a cyclic redundancy check module connected with the random access storage module; The reference voltage compensation method of the display panel further comprises the following steps: The cyclic redundancy check module checks the data obtained from the memory by the random access storage module, and controls the random access storage module to obtain the data from the memory again when the check fails.

12. A display device comprising: The reference voltage compensation device of the display panel comprises the display panel and any one of the display panels in claims 1-7.

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