Reference voltage compensation device and compensation method of display panel and display device

Abstract

The invention discloses a reference voltage compensation device and compensation method of a display panel and a display device.The reference voltage compensation device of the display panel comprises a memory, a reference voltage compensation circuit and a reference voltage compensation circuit, the driving chip is connected with the memory so as to obtain storage data in the memory; the driving chip comprises a voltage compensation module, and the voltage compensation module is used for compensating the reference voltage in the display panel according to the obtained target register value. According to the technical scheme provided by the invention, the display effect of the display panel is improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a reference voltage compensation device, a compensation method and a display device of a display panel. Background Art

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

[0003] In existing organic light emitting display panels, water ripples may appear on the display screen of the display panel, which affects the display effect of the display panel. Summary of the invention

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

[0005] According to one aspect of the present invention, there is provided a reference voltage compensation device for a display panel, comprising:

[0006] a memory, wherein the stored data in the memory includes a target register value;

[0007] A driving chip is connected to the memory to obtain the storage data in the memory; the driving chip includes a voltage compensation module, and the voltage compensation module is used to compensate the reference voltage in the display panel according to the obtained target register value.

[0008] Optionally, the voltage compensation module includes:

[0009] A bias current generating unit, the bias current generating unit being configured to output a corresponding bias current according to the acquired target register value;

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

[0011] Optionally, the reference voltage includes 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 includes:

[0012] A first compensation unit, the first compensation unit is used to output a compensated first reference voltage according to the voltage drop of the initial first reference voltage and the power supply voltage under the bias current

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

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

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

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

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

[0018] The output end of the amplifier is electrically connected to the second end of the fourth resistor.

[0019] Optionally, the driver chip further includes:

[0020] A control module, the control module is used to generate a termination instruction when the display panel enters a display mode and exits a sleep mode.

[0021] a random access storage module connected to the control module, the voltage compensation module and the memory, wherein the random access storage module is used to obtain a target register value stored in the memory after receiving a termination instruction sent by the control module, and send the target register value to the voltage compensation module;

[0022] Preferably, the driver chip further includes:

[0023] A one-time programming storage module; the storage data of the one-time programming storage module includes the original register value; the one-time programming storage module is used to stop sending the original register value to the voltage compensation module after receiving the termination instruction.

[0024] Optionally, the driver chip further includes:

[0025] a cyclic redundancy check module connected to the random access storage module, the cyclic redundancy check module being used to check the data acquired by the random access storage module from the storage, and controlling the random access storage module to acquire data from the storage again when the check fails;

[0026] Preferably, the data for the cyclic redundancy check includes 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 obtained target register value; the voltage compensation module is located in a driver chip, and the driver chip is connected to the memory to obtain the storage data in the memory.

[0030] Optionally, the voltage compensation module includes a bias current generating 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 according to the acquired target register value;

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

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

[0034] The control unit generates a termination instruction when the display panel enters at least one of a display mode and exits a sleep mode;

[0035] After receiving the termination instruction sent by the control module, the random access storage 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 comprises: a one-time programming storage module; the storage data of the one-time programming storage module comprises original register values;

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

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

[0039] Preferably, the driving chip further includes a cyclic redundancy check module, and the cyclic redundancy check module is connected to the random access storage module; the reference voltage compensation method of the display panel further includes:

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

[0041] According to another aspect of the present invention, a display device is provided, comprising a display panel and the reference voltage compensation device for the display panel according to any one of the embodiments of the present invention.

[0042] The embodiment of the present invention provides a reference voltage compensation device, compensation method and display device of a display panel, wherein the reference voltage compensation device of the display panel comprises: a memory, wherein the stored data in the memory comprises a target register value; a driver chip connected to the memory; the driver chip comprises a voltage compensation module, wherein the voltage compensation module is used to compensate the reference voltage in the display panel according to the acquired target register value. The technical solution provided by the embodiment of the present invention stores the target register value of the voltage compensation module (ELVDD AVC module) in the memory, and writes the target register value stored in the memory into the voltage compensation module in the driver chip (DDIC) when the display panel enters the display mode and exits the sleep mode, so as to cover the initial register value burned in the driver chip, thereby improving the water ripple problem of the display screen and improving the display effect of the display panel.

[0043] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

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

[0048] Figure 4is a flow chart of a reference voltage compensation method for a display panel provided by an embodiment of the present invention;

[0049] Figure 5 is a flow chart of another reference voltage compensation method for a display panel provided by an embodiment of the present invention;

[0050] Figure 6 is a flow chart of another reference voltage compensation method for a display panel provided by an embodiment of the present invention;

[0051] Figure 7 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0054] As the background technology, the display screen of the display panel has the phenomenon of water ripples, which affects the display effect of the display panel. The power management chip (Power Management IC, PMIC) generates a power supply voltage (for example, ELVDD) according to the signal to be displayed. The reference voltage VGMP (gamma high voltage) and the reference voltage VGSP (gamma low voltage) in the display panel are obtained according to the output value of the power supply voltage, and are output to the source driver, so that the source driver drives each pixel of the display panel to display according to the reference voltage VGMP and the reference voltage VGSP. Since the wiring output from the power management chip (PMIC) to the display panel is long and the resistance of the wiring is large, the voltage drop (Drop) of the power supply voltage (for example, ELVDD) is correspondingly large. In the related art, an ELVDD AVC (Adaptive VGMP Control, voltage compensation function) module is provided in the display driver chip (Display Driver IC, DDIC), and the voltage drop of the ELVDD wiring is detected by the ELVDD AVC module, and the voltage compensation of VGMP and VGSP is performed according to the detected voltage drop. For example, if it is detected that ELVDD decreases by 0.1V, VGMP and VGSP are reduced by 0.1V respectively; or they can be reduced by a coefficient, such as a coefficient of 0.5, and VGMP and VGSP are reduced by 0.05V respectively.

[0055] The detection accuracy of the ELVDD AVC module for the ELVDD voltage drop can be determined by the size of the bias current IB. The ELVDDAVC module (register) can output the corresponding bias current IB according to the value set in the register, such as 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, the size of the generated bias current IB is not set appropriately. When the ELVDD AVC module is too sensitive or insensitive to the ELVDD routing voltage drop detection and VGMP / VGSP voltage compensation, it will cause the compensated first reference voltage VGMP and the second reference voltage VGSP to fluctuate periodically, and eventually cause water ripples to appear on the display screen of the display panel.

[0056] At present, the detection accuracy setting of the ELVDD AVC module in DDIC can be divided into 4 levels, 0.5uA / 1uA / 2uA / 4uA; when the ELVDD AVC register is set to one of the values ​​(such as Reg1: 2uA), it is stored in DDIC through OTP (One Time Programmable). If Reg1 is not applicable to all screens at this time, and Reg1 is not modified if OTP is not performed again after it is stored in DDIC, the screen that does not apply the register value stored in DDIC will have a water ripple problem.

[0057] In view of this, an embodiment of the present invention provides a reference voltage compensation device for a display panel. Figure 1 is a structural block diagram of a reference voltage compensation device for a display panel provided by an embodiment of the present invention, with reference to Figure 1 , the reference voltage compensation device of the display panel comprises:

[0058] A memory 10, wherein the storage data in the memory 10 includes a target register value;

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

[0060] Specifically, the memory 10 may be a Flash (Flash may be Nand-flash) IC, and of course, those skilled in the art may also select it according to actual conditions. The stored data stored in the memory 10 includes the target register value. The driver chip 20 is a display driver chip (DDIC), and the driver chip 20 is connected to the memory 10, and the stored target register value can be obtained from the memory 10. The driver chip 20 and the memory 10 can be connected via a serial peripheral interface (Serial Peripheral Interface, SPI).

[0061] The driver chip 20 is provided with a voltage compensation module 21, namely the above-mentioned 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 according to the target register value. The target register value can be understood as a register value suitable for the current screen. Under the action of the bias current IB generated according to the target register value, the voltage compensation module 21 performs voltage drop detection on the ELVDD line and compensates the reference voltage, thereby improving the problem of water ripples on the display panel, and even eliminating the water ripples on the display panel.

[0062] The technical solution provided by the embodiment of the present invention stores the target register value of the voltage compensation module 21 in the memory 10, and writes the target register value stored in the memory 10 into the voltage compensation module 21 in the driver chip 20 (DDIC) when the display panel enters the display mode and exits the sleep mode in at least one state, so as to overwrite the initial register value burned in the driver chip 20, thereby improving the water ripple problem of the display screen and improving the display effect of the display panel.

[0063] On this basis, the stored data stored in the memory 10 may also include gamma data, gamma compensation (demura) data, etc. The driver chip 20 is connected to the memory 10, and the stored data can be obtained from the memory 10. In the related art, the memory 10 is used in an extensive manner. For example, only the gamma compensation data is stored in the memory 10 through a serial peripheral interface (SPI), and the gamma data and the register data of the voltage compensation module are stored in the driver chip 20 through the OTP method. The embodiment of the present invention can directly store the gamma data and the register data of the voltage compensation module in the memory 10 outside the driver chip 20 in units of page addresses, thereby realizing the refined management of the memory 10, and at the same time utilizing the high writing speed of the memory 10, and its writing time is basically kept equivalent to the driver chip 20 stored through OTP in the related art.

[0064] At the same time, large-capacity data is directly stored in the memory 10 arranged outside the driver chip 20, which increases the utilization efficiency of the driver chip 20. In theory, countless data writing can be achieved, thereby saving costs; and the hardware cost of the memory 10 used is much lower than the hardware cost caused by the increase in the size of the driver chip 20, thereby effectively reducing the size of the driver chip 20, reducing hardware costs, and improving the effect of the AMOLED display panel.

[0065] Optionally, the memory 10 may store a plurality of register values ​​to provide adaptive target register values ​​for a variety of display panels.

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

[0067] A bias current generating unit, the bias current generating unit is used to output a corresponding bias current according to the acquired target register value;

[0068] The voltage compensation unit is used to output a compensated reference voltage according to the voltage drop of the initial reference voltage and the power supply voltage under a 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 correspondingly includes two voltage compensation units, namely a first compensation unit and a second compensation unit. The first compensation unit is used to output a compensated first reference voltage according to an initial first reference voltage (uncompensated first reference voltage) and a voltage drop of a power supply voltage under a bias current. The second compensation unit is used to output a compensated second reference voltage according to an initial second reference voltage (uncompensated second reference voltage) and a voltage drop of a power supply voltage under a bias current.

[0070] Figure 2 is a circuit diagram of a voltage compensation unit provided by an embodiment of the present invention, with reference to 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 the amplifier 211 is electrically connected to the second terminal of the first resistor R1 and the second terminal of the second resistor R2; the first terminal of the first resistor R1 inputs an 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 inputs a power supply voltage ELVDD_AVC detected at the target circuit; the negative input terminal of the amplifier 211 is electrically connected to the second terminal of the third resistor R3 and the first terminal of the fourth resistor 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 inputs a power supply voltage ELVDD without voltage drop; the control terminal of the control switch K is used to receive a control signal ELVDD_AVC_ENB; the output terminal of the amplifier 211 is electrically connected to the second terminal of the fourth resistor R4, and the output terminal of the amplifier 211 outputs the compensated reference voltage.

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

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

[0073] Of course, the target circuit may also be other circuits of the display panel, and as long as the reference voltage needs to be compensated according to the difference between the output value and the actual value of the power supply voltage, the design of the voltage compensation unit in the present application can be applied, and no limitation is made here. For example, the target circuit may be a GOA circuit, and 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, thereby affecting the related control of each pixel of the display panel.

[0074] Based on the above embodiments, optionally, Figure 3 is a structural block diagram of another reference voltage compensation device for a display panel provided by an embodiment of the present invention, with reference to Figure 3 , the driving chip 20 further includes:

[0075] A control module 22, the control module 22 is used to generate a termination instruction when the display panel enters a display mode and exits a sleep mode;

[0076] The random access storage module 23 is connected to the control module 22, the voltage compensation module 21 and the memory 10. The random access storage module 23 is used to obtain the target register value stored in the memory 10 after receiving the termination instruction sent by the control module 22, and send the target register value to the voltage compensation module 21.

[0077] Specifically, the mipi protocol control instructions of the display panel include 11h (sleep out, the driver chip 20 exits the sleep mode), 29h (display on, the driver chip 20 displays normally), 10h (sleep in, the driver chip 20 enters the sleep mode) and 28h (display off, the driver chip 20 turns off the display). After the control module 22 receives the 11h and 29h instructions, it will generate a termination instruction to control the random access storage module 23 to obtain the data stored in the memory 10 for display. The random access storage module 23 is the memory bar (Random Access Memory, RAM) in the driver chip 20. The driver chip 20 also includes a one-time programming storage module 24; the storage data of the one-time programming storage module 24 includes the original register value; the one-time programming storage module 24 is used to stop sending the original register value to the voltage compensation module 21 after receiving the termination instruction. When the driver chip 20 is powered off, the register value received by the ELVDD AVC module is still the initial register value. In an embodiment of the present invention, after the control module 22 receives the 11h and 29h instructions, it controls the random access storage module 23 to transfer the target register value in the memory 10 to the random access storage 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, please continue to refer to 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 storage module 23, and the cyclic redundancy check module 25 is used to check the data obtained by the random access storage module 23 from the memory 10, and when the check fails, control the random access storage module 23 to re-acquire data from the memory 10.

[0079] Specifically, CRC (Cyclic Redundancy Check) is a commonly used verification method in data transmission. It generates a verification code of a certain length by calculating the data, and attaches the verification code to the data for transmission. The principle of CRC verification is to regard the data as a binary string, and finally obtain a verification code of a specified length by performing a series of shift, XOR and other operations on the binary string. When receiving data, the receiving end also performs CRC calculation on the data. If the calculated verification code is consistent with the received verification code, it is considered that there is no error in the data transmission, otherwise it is considered that there is an error in the data transmission. In order to prevent the target register value from being disturbed when the DDIC is working, such as being disturbed by ESD, the gamma data stored in the RAM can be CRC-checked in the first frame of the display panel, and the gamma data stored in the RAM can also be CRC-checked in the subsequent display frames. When the calculated verification code is different from the received verification code, the inspection fails and the stored data needs to be obtained from the Flash IC again.

[0080] An embodiment of the present invention further provides a reference voltage compensation method for a display panel, which is performed by the reference voltage compensation device for a display panel described in any of the above embodiments; Figure 4 is a flow chart of a reference voltage compensation method for a display panel provided by an embodiment of the present invention, referring to Figure 4 , the reference voltage compensation method of the display panel includes:

[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, and the driver chip is connected to the memory to obtain the storage data in the memory.

[0083] Specifically, the memory may be a Flash (Flash may be a Nand-flash) IC, and of course, those skilled in the art may also make a selection according to actual conditions. The target register value is stored in the memory. The driver chip is a display driver chip (DDIC), and the driver chip is connected to the memory, and the stored target register value can be obtained from the memory. A voltage compensation module is provided in the driver chip, namely the above-mentioned ELVDD AVC module. The voltage compensation module may replace the initial register value stored in the driver chip by obtaining the target register value from the memory, and then generate a bias current IB according to the target register value. The target register value may be understood as a register value applicable to the screen body. Under the action of the bias current IB generated according to the target register value, the voltage compensation module performs voltage drop detection on the ELVDD wiring 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 generating unit and a voltage compensation unit; step S120: the voltage compensation module obtains a target register value and compensates a reference voltage in the display panel according to the target register value, including:

[0085] The bias current generating unit generates a corresponding bias current according to the acquired target register value;

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

[0087] Optionally, the driving chip further includes: a control module and a random access storage module; the random access storage module is connected to the control module, the voltage compensation module and the memory. Figure 5 1 is a flow chart of another reference voltage compensation method for a display panel provided by an embodiment of the present invention. In step S120, before the voltage compensation module obtains a 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 a termination instruction when the display panel enters at least one of a display mode and exits a sleep mode.

[0089] S1202, after receiving the termination instruction sent by the control module, the random access storage 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 further includes a one-time programming storage module; the storage data of the one-time programming storage module includes an original register value; after the control unit generates a termination instruction when the display panel enters at least one of a display mode and exits a sleep mode, the reference voltage compensation method of the display panel further includes:

[0091] After receiving the termination instruction, the one-time programming storage module stops sending the original register value to the voltage compensation module.

[0092] Preferably, the driving chip further includes a cyclic redundancy check module, and the cyclic redundancy check module is connected to the random access storage module. Figure 6 is a flow chart of another reference voltage compensation method for a display panel provided by an embodiment of the present invention, referring to Figure 6 In step S120, after 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 of the display panel further includes:

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

[0094] Figure 7 is a schematic diagram of a display device provided by an embodiment of the present invention, with reference to Figure 7 The embodiment of the present invention further provides a display device, including a display panel 100 and a reference voltage compensation device 200 according to any embodiment of the present invention. The same technical effects are achieved and will not be described in detail here.

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

Claims

1. A reference voltage compensation device for a display panel, characterized in that: include: a memory, wherein the stored data in the memory includes a target register value; A driving chip connected to the memory to obtain the storage data in the memory; The driving chip comprises a voltage compensation module, and the voltage compensation module is used to compensate a reference voltage in the display panel according to the acquired target register value.

2. The reference voltage compensation device for a display panel according to claim 1, characterized in that: The voltage compensation module comprises: A bias current generating unit, the bias current generating unit being configured to output a corresponding bias current according to the acquired target register value; The voltage compensation unit is used to output a compensated reference voltage according to the initial reference voltage and the voltage drop of the power supply voltage under the bias current.

3. The reference voltage compensation device for a display panel according to claim 2, characterized in that: 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 voltage compensation unit comprises: A first compensation unit, the first compensation unit is used to output a compensated first reference voltage according to the voltage drop of the initial first reference voltage and the power supply voltage under the bias current The second compensation unit is used to output a compensated second reference voltage according to the voltage drop of the initial second reference voltage and the power supply voltage under the bias current.

4. The reference voltage compensation device for a display panel according to claim 3, characterized in that: The first compensation unit and / or the second compensation unit comprises: A first resistor, a second resistor, a third resistor, a fourth resistor, a control switch and an amplifier; The positive input terminal of the amplifier is electrically connected to the second end of the first resistor and the second end of the second resistor; the first end of the first resistor inputs a reference voltage; the first end of the second resistor is electrically connected to the first end of the control switch; the first end of the second resistor inputs a power supply voltage detected at the target circuit; The negative input terminal of the amplifier is electrically connected to the second end of the third resistor and the first end of the fourth resistor; the first end of the third resistor is electrically connected to the second end of the control switch; the first end of the third resistor inputs a power supply voltage without voltage drop; the control end of the control switch is used to receive a control signal; The output end of the amplifier is electrically connected to the second end of the fourth resistor.

5. The reference voltage compensation device for a display panel according to claim 1, characterized in that: The driver chip also includes: A control module, the control module is used to generate a termination instruction when the display panel enters a display mode and exits a sleep mode. a random access storage module connected to the control module, the voltage compensation module and the memory, wherein the random access storage module is used to obtain a target register value stored in the memory after receiving a termination instruction sent by the control module, and send the target register value to the voltage compensation module; Preferably, the driver chip further includes: A one-time programming storage module; the storage data of the one-time programming storage module includes the original register value; the one-time programming storage module is used to stop sending the original register value to the voltage compensation module after receiving the termination instruction.

6. The reference voltage compensation device for a display panel according to claim 5, characterized in that: The driver chip also includes: a cyclic redundancy check module connected to the random access storage module, the cyclic redundancy check module being used to check the data acquired by the random access storage module from the storage, and controlling the random access storage module to acquire data from the storage again when the check fails; Preferably, the data for the cyclic redundancy check includes gamma data.

7. A reference voltage compensation method for a display panel, characterized in that: include: The memory stores the target register value; 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 a driving chip, and the driving chip is connected to the memory to obtain the storage data in the memory.

8. The reference voltage compensation method of a display panel according to claim 7, characterized in that: The voltage compensation module includes a bias current generating 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: The bias current generating unit generates a corresponding bias current according to the acquired target register value; The voltage compensation unit outputs a compensated reference voltage according to the initial reference voltage and the voltage drop of the power supply voltage under the bias current.

9. The reference voltage compensation method of a display panel according to claim 7, characterized in that: The driving chip further includes: a control module and a random access storage module; the random access storage module is connected to the control module, the voltage compensation module and the memory; the reference voltage compensation method of the display panel further includes: The control unit generates a termination instruction when the display panel enters at least one of a display mode and exits a sleep mode; After receiving the termination instruction sent by the control module, the random access storage module obtains the target register value stored in the memory, and sends the target register value to the voltage compensation module; Preferably, the driver chip further comprises: a one-time programming storage module; the storage data of the one-time programming storage module comprises original register values; The reference voltage compensation method of the display panel also includes: After receiving the termination instruction, the one-time programming storage module stops sending the original register value to the voltage compensation module; Preferably, the driving chip further includes a cyclic redundancy check module, and the cyclic redundancy check module is connected to the random access storage module; the reference voltage compensation method of the display panel further includes: The cyclic redundancy check module checks the data acquired by the random access storage module from the memory, and controls the random access storage module to acquire data from the memory again when the check fails.

10. A display device, characterized in that: The invention comprises a display panel and a reference voltage compensation device for the display panel as claimed in any one of claims 1 to 6.

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