Voltage regulation system and display panel

Abstract

A voltage regulation system and a display panel. The voltage regulation system comprises: an acquisition circuit (1) configured to acquire a working current of a display panel to generate a corresponding acquisition voltage; at least one comparison circuit configured to generate a control signal on the basis of the acquisition voltage and a preset reference voltage; a digital signal changing circuit (3) configured to output a readable signal on the basis of the control signal outputted by each comparison circuit; and a driving voltage output circuit (4) configured to determine, on the basis of the readable signal, a temperature range in which a driving chip is located, and output a group of driving voltages corresponding to the temperature range.

Description

Voltage regulation system and display panel Technical Field

[0001] The present disclosure belongs to the field of display technology, and particularly relates to a voltage regulation system and a display panel. Background Art

[0002] In the prior art, thermistors are typically used to measure and monitor the temperature of driver chips on display panels. However, the nonlinear relationship between thermistors and temperature increases the difficulty and complexity of measurement. In addition, thermistors experience severe aging and poor stability.

[0003] To address these issues, the present invention discloses a voltage regulation system that collects operating current and compares it with a preset reference voltage to generate a control signal. A temperature determination module determines the current temperature of the driver chip based on the control signal, and a voltage drive module outputs voltages in different temperature ranges based on the determination result. The voltage regulation system of the present invention has high sensitivity and a long service life, capable of promptly detecting changes in the driver chip temperature and outputting an adjusted drive voltage to accommodate the temperature change.

[0004] Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art and provides a voltage regulation system and a display panel.

[0006] In a first aspect, the present disclosure provides a voltage regulation system, comprising:

[0007] An acquisition circuit is configured to acquire the operating current of the display panel and generate a corresponding acquisition voltage;

[0008] at least one comparison circuit, wherein the comparison circuit is configured to generate a control signal according to the sampled voltage and a preset reference voltage;

[0009] a digital signal changing circuit configured to output a readable signal according to the control signal output by each of the comparison circuits;

[0010] The driving voltage output circuit is configured to determine the temperature zone of the driving chip according to the readable signal and output a set of driving voltages corresponding to the temperature zone.

[0011] Preferably, the voltage regulation system includes a first comparison circuit and a second comparison circuit;

[0012] The first comparison circuit is configured to compare the collected voltage with a first reference voltage, and output a first control signal when the collected voltage is found to be greater than the first reference voltage, and output a second control signal when the collected voltage is found to be less than the first reference voltage;

[0013] The second comparison circuit is configured to compare the collected voltage with a second reference voltage, and output the second control signal when the collected voltage is found to be greater than the first reference voltage, and output the first control signal when the collected voltage is found to be less than the second reference voltage;

[0014] The first reference voltage is greater than the second reference voltage.

[0015] Preferably, the digital signal changing circuit is configured to output a first readable signal when the first comparison circuit outputs the first control signal and the second comparison circuit outputs the second control signal; output a second readable signal when both the first comparison circuit and the second comparison circuit output the second control signal; and output a third readable signal when the first comparison circuit outputs the second control signal and the second comparison circuit outputs the first control signal.

[0016] The first readable signal indicates that the current temperature is in the first temperature range; the second readable signal indicates that the current temperature is in the second temperature range; and the third readable signal indicates that the current temperature is in the third temperature range.

[0017] The lowest temperature of the first temperature section is equal to the highest temperature of the second temperature section; the highest temperature of the second temperature section is equal to the highest temperature of the third temperature section.

[0018] Preferably, the driving voltage output circuit is configured to determine that the current temperature of the driving chip is in the first temperature zone and output a first set of driving voltages when the digital signal change circuit outputs the first readable signal; to determine that the current temperature of the driving chip is in the second temperature zone and output a second set of driving voltages when the digital signal change circuit outputs the second readable signal; and to determine that the current temperature of the driving chip is in the third temperature zone and output a third set of driving voltages when the digital signal change circuit outputs the third readable signal.

[0019] Preferably, the driving signal output circuit includes a judgment module and a digital voltage driving module; the digital voltage control module includes multiple sets of temperature zone data tables;

[0020] The judgment module is configured in the digital signal changing circuit and is configured to determine that the current temperature of the driver chip is in the first temperature range when the digital signal changing circuit outputs the first readable signal; determine that the current temperature of the driver chip is in the second temperature range when the digital signal changing circuit outputs the second readable signal; and determine that the current temperature of the driver chip is in the third temperature range when the digital signal changing circuit outputs the third readable signal;

[0021] The digital voltage driving module is configured to call the first temperature zone data table and output a first set of digital control instructions when the judgment module determines that the temperature is in the first temperature zone; call the second temperature zone data table and output a second set of digital control instructions when the judgment module determines that the temperature is in the second temperature zone; and call the third temperature zone data table and output a third set of digital control instructions when the judgment module determines that the temperature is in the third temperature zone.

[0022] Preferably, the driving signal output circuit further includes a power management module and a gamma voltage control module;

[0023] The power management module is configured to output a first set of analog voltages when the determination module determines that the temperature is in the first temperature range; output a second set of analog voltages when the determination module determines that the temperature is in the second temperature range; and output a third set of analog voltages when the determination module determines that the temperature is in the third temperature range.

[0024] The gamma voltage control module is configured to output a first gamma voltage when the judgment module determines that the temperature is in the first temperature zone and the power management module outputs a first set of analog voltages; output a second gamma voltage when the judgment module determines that the temperature is in the second temperature zone and the power management module outputs a second set of analog voltages; and output a third gamma voltage when the judgment module determines that the temperature is in the third temperature zone and the power management module outputs a third set of analog voltages.

[0025] Preferably, the digital voltage control module includes an inter-frame overdriving temperature segment data table, an inter-row overdriving temperature segment data table, a multi-frequency gamma voltage correction temperature segment data table, and a data delay compensation temperature segment data table.

[0026] Preferably, the judgment module is connected to the gamma voltage control module and the power management module via I2C communication.

[0027] Preferably, the first comparison circuit has a first input terminal, a second input terminal and a first output terminal; the first input terminal is connected to the first reference voltage terminal, the second input terminal is connected to the acquisition circuit, and the first output terminal is connected to the digital signal change circuit;

[0028] The second comparison circuit has a third input terminal, a fourth input terminal and a second output terminal; the third input terminal is connected to the acquisition circuit, the fourth input terminal is connected to the second reference voltage terminal, and the second output terminal is connected to the digital signal changing circuit.

[0029] Preferably, the acquisition circuit includes an acquisition resistor, a first transistor, and a second transistor arranged opposite to the first transistor;

[0030] The control electrode of the first transistor and the control electrode of the second transistor are both connected to a first driving voltage terminal;

[0031] The connection node between the first electrode of the first transistor and the first electrode of the second transistor is multiplexed as a signal input terminal of the acquisition circuit, inputting the operating voltage;

[0032] The second electrode of the first transistor is connected to the display unit of the display panel, the second electrode of the second transistor is connected to one end of the collection resistor, and the other end of the collection resistor is connected to the reference ground.

[0033] Preferably, the size of the second transistor is N times the size of the first transistor, where N is greater than 1.

[0034] Preferably, the first comparison circuit includes a first operational amplifier and a third transistor;

[0035] The non-inverting input terminal of the first operational amplifier is multiplexed as the first input terminal of the first comparison circuit, connected to the first reference voltage terminal, the inverting input terminal is multiplexed as the second input terminal of the first comparison circuit, connected to the connection node between the second electrode of the second transistor and the collection resistor, and the output terminal is connected to the control electrode of the third transistor.

[0036] Preferably, the first comparison circuit further includes a first resistor;

[0037] One end of the first resistor is connected to the second driving voltage terminal, and the other end is connected to the first electrode of the third transistor; the connection node between the first resistor and the first electrode of the third transistor is multiplexed as the first output terminal of the first comparison circuit;

[0038] The second electrode of the third transistor is connected to the reference ground.

[0039] Preferably, the second comparison circuit includes a second operational amplifier and a fourth transistor;

[0040] The non-inverting input terminal of the second operational amplifier is multiplexed as the third input terminal of the second comparison circuit, connected to the connection node between the second electrode of the second transistor and the collection resistor; the inverting input terminal is multiplexed as the fourth input terminal of the second comparison circuit, connected to the second reference voltage terminal; and the output terminal is connected to the control electrode of the fourth transistor.

[0041] Preferably, the second comparison circuit further includes a second resistor;

[0042] One end of the second resistor is connected to the second driving voltage terminal, and the other end is connected to the first electrode of the fourth transistor; the connection node between the second resistor and the first electrode of the fourth transistor is multiplexed as the second output terminal of the second comparison circuit;

[0043] The second electrode of the fourth transistor is connected to the reference ground.

[0044] Preferably, the comparison circuit further includes an effective value conversion module; the effective value conversion module is configured to convert the collected voltage into an effective value voltage;

[0045] The input end of the effective value conversion module is connected to the connection node between the second electrode of the second transistor and the collection resistor, and the output end is connected to the second input end of the first comparison circuit and the third input end of the second comparison circuit.

[0046] In a second aspect, the present disclosure provides a display panel comprising the above-mentioned voltage regulation system.

[0047] Preferably, the display panel further includes a gate driving circuit;

[0048] The driving voltage output by the voltage regulation system is connected to the signal terminals of the shift registers in the gate driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] FIG1 is a module diagram of a voltage regulation system provided by the present disclosure;

[0050] FIG2 is a module diagram of another voltage regulation system provided by the present disclosure;

[0051] FIG3 is a partial structural diagram of a voltage regulation system provided by the present disclosure;

[0052] FIG4 is a partial structural diagram of another voltage regulation system provided by the present disclosure. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0054] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0055] Before describing the embodiments of the present disclosure, it should be noted that, in the embodiments of the present disclosure, the working voltage collected by the acquisition circuit can be a positive voltage signal or a negative voltage signal, and optionally, it can also be a pulse signal. In the embodiments of the present disclosure, only the working voltage is a positive voltage signal as an example for explanation. However, it should be understood that this does not constitute a limitation on the scope of protection of the embodiments of the present disclosure. In addition, in the embodiments of the present disclosure, the control signal can be a high-level signal or a low-level signal, wherein the high-level signal is referred to as the first control signal and the low-level signal is referred to as the second control signal. Optionally, the transistor in the embodiments of the present disclosure can be a thin-film transistor or a field-effect transistor or other devices with the same characteristics. The switching characteristics of the transistor in the embodiments of the present disclosure can be N-type or P-type. In the embodiments of the present disclosure, only the transistor is N-type to illustrate the circuit in this application.

[0056] In the embodiments of the present disclosure, the source and drain of each transistor are structurally indistinguishable and can be interchanged. Here, in order to distinguish the two poles other than the gate, one of the poles is referred to as the source and the other as the drain. The first pole can be the source and the second pole can be the drain. For an N-type transistor, when a high-level signal is input to the gate, the transistor is turned on, and when a low-level signal is input to the gate, the transistor is turned off. For a P-type transistor, when a low-level signal is input to the gate, the transistor is turned on, and when a high-level signal is input to the gate, the transistor is turned off.

[0057] Temperature has a significant impact on all aspects of a display panel. In the prior art, thermistors are typically used to measure the temperature of driver chips on display panels. However, thermistors have poor stability and severe aging issues. Therefore, the following solutions are proposed in the present disclosure.

[0058] In a first aspect, embodiments of the present disclosure provide a voltage regulation system. This system collects operating current I, converts it into a sampled voltage Vs, and compares it with a preset reference voltage. This system can promptly determine the current temperature zone of a driver chip and adjust each drive signal based on the temperature zone to output a set of digital and analog voltages adapted to the ambient temperature. Figure 1 is a block diagram of the voltage regulation system provided by an embodiment of the present disclosure. As shown in Figure 1, the voltage regulation system includes an acquisition circuit 1, at least one comparison circuit, a digital signal modification circuit 3, and a drive voltage output circuit 4. The acquisition circuit 1 is configured to collect the operating current I of the display panel and generate a corresponding sampled voltage Vs. The comparison circuit is configured to generate a first control signal H or a second control signal L based on the sampled voltage Vs and a preset reference voltage. The digital signal modification circuit 3 is configured to output a readable signal to the drive voltage output circuit 4 and the display unit Panel based on each control signal. The drive voltage output circuit 4 includes a determination module JDG and a digital voltage control module, which includes multiple sets of temperature zone data tables. The judgment module JDG is configured to determine the temperature zone of the driver chip according to the readable signal, and the digital voltage control module is configured to call the corresponding temperature zone data table according to the judgment result of the judgment module JDG and output a set of corresponding digital control instructions to the display unit Panel.

[0059] In some examples, the voltage regulation system includes at least one comparison circuit having a first input terminal and a second input terminal, either of which is connected to a reference voltage terminal, and the other is connected to the acquisition circuit 1. The acquisition circuit 1 compares the sampled voltage Vs with the reference voltage to generate a first control signal H or a second control signal L. The judgment module JDG divides the entire temperature range into several temperature ranges based on the control signals output by each comparison circuit and determines which temperature range the current temperature belongs to. Optionally, when the voltage regulation system includes one comparison circuit, that is, only one reference voltage terminal is connected, the judgment module JDG divides the temperature range into two temperature ranges. When the voltage regulation system includes two comparison circuits, namely, a first comparison circuit 21 and a second comparison circuit 22, the first comparison circuit 21 and the second comparison circuit 22 each generate a control signal to form a pair of control signals. The judgment module JDG divides the temperature range into three temperature ranges based on the pair of control signals: a first temperature range, a second temperature range, and a third temperature range. The lowest temperature of the first temperature section is set equal to the highest temperature of the second temperature section, and the lowest temperature of the second temperature section is set equal to the highest temperature of the third temperature section. Similarly, the comparison circuit can be designed to include more comparison circuits, dividing the temperature into more sections to achieve accurate temperature determination. In the following embodiments, only two comparison circuits are used as an example to illustrate the voltage regulation system of the present disclosure.

[0060] Specifically, as shown in Figure 2, the first comparison circuit 21 has a first input terminal Input1, a second input terminal Input2, and a first output terminal Output1, wherein the first input terminal Input1 is connected to the first reference voltage Vref1 terminal, the second input terminal Input2 is connected to the acquisition circuit 1, and the first output terminal Output1 is connected to the drive voltage output circuit 4. The second comparison circuit 22 has a third input terminal Input3, a fourth input terminal Input4, and a second output terminal Output2, wherein the third input terminal Input3 is connected to the acquisition circuit 1, the fourth input terminal Input4 is connected to the second reference voltage Vref2 terminal, and the second output terminal Output2 is connected to the drive voltage output circuit 4. Here, the first reference voltage Vref1 can be set to be greater than the second reference voltage Vref2. The comparison process of the comparison circuit and the judgment process of the judgment module JDG include the following three cases.

[0061] In the first case, the first comparison circuit 21 compares that the collected voltage Vs is greater than the first reference voltage Vref1 and outputs a first control signal H. The second comparison circuit 22 compares that the collected voltage Vs is greater than the second reference voltage Vref2 and outputs a second control signal L. The digital signal change circuit 3 outputs a first readable signal, and the judgment module JDG determines that the current temperature of the driver chip is in the first temperature range.

[0062] In the second case, the first comparison circuit 21 compares that the collected voltage Vs is less than the first reference voltage Vref1 and outputs the second control signal L. The second comparison circuit 22 compares that the collected voltage Vs is greater than the second reference voltage Vref2 and outputs the second control signal L. The digital signal change circuit 3 outputs the second readable signal, and the judgment module JDG determines that the current temperature of the driver chip is in the second temperature range.

[0063] In the third case, the first comparison circuit 21 compares that the collected voltage Vs is less than the first reference voltage Vref1 and outputs the second control signal L. The second comparison circuit 22 compares that the collected voltage Vs is less than the second reference voltage Vref2 and outputs the first control signal H. The digital signal change circuit 3 outputs a third readable signal, and the judgment module JDG determines that the current temperature of the driver chip is in the third temperature range.

[0064] Alternatively, in the above embodiment, the first reference voltage Vref1 is set to be greater than the second reference voltage Vref2, or the second reference voltage Vref2 is set to be greater than the first reference voltage Vref1. In this case, the control signal pairs output by the two comparison circuits change accordingly. Furthermore, when more than two comparison circuits are included, more reference voltage terminals need to be connected, thereby dividing the system into more temperature ranges, thereby increasing the voltage regulation system's sensitivity to temperature changes.

[0065] In some examples, the digital voltage control module includes multiple groups of temperature zone data tables, each group of temperature zone data tables includes a first temperature zone data table Table1, a second temperature zone data table Table2, and a third temperature zone data table Table3. Among them, the first temperature zone data table Table1 includes the temperature range corresponding to the first temperature zone and the first digital control instruction. The second temperature zone data table Table2 includes the temperature range corresponding to the second temperature zone and the second digital control instruction. The third temperature zone data table Table3 includes the temperature range corresponding to the third temperature zone and the third digital control instruction. Furthermore, the multiple first digital control instructions in the multiple groups of temperature zone data tables constitute the first group of digital control instructions, the multiple second digital control instructions constitute the second group of digital control instructions, and the multiple third digital control instructions constitute the third group of digital control instructions.

[0066] When the judgment module JDG determines which temperature zone the driver chip's current temperature is in, the digital voltage control module calls the corresponding multiple first, second, or third temperature zone data tables and outputs a corresponding set of digital control instructions. Accordingly, when the judgment module JDG determines that the driver chip's current temperature is in the first temperature zone, the digital voltage control module calls multiple sets of first temperature zone data tables, Table 1, and outputs a first set of digital control instructions. When the judgment module JDG determines that the driver chip's current temperature is in the second temperature zone, the digital voltage control module calls multiple sets of second temperature zone data tables, Table 2, and outputs a second set of digital control instructions. When the judgment module JDG determines that the driver chip's current temperature is in the third temperature zone, the digital voltage control module calls multiple sets of third temperature zone data tables, Table 3, and outputs a third set of digital control instructions.

[0067] Optionally, the digital voltage control module includes an inter-frame overdriving temperature segment data table, an inter-row overdriving temperature segment data table, a multi-frequency gamma voltage correction temperature segment data table, and a data delay compensation temperature segment data table. Among them, the inter-frame over-drive temperature segment data table includes the inter-frame over-drive first temperature segment data table OD Table1, the inter-frame over-drive second temperature segment data table OD Table2 and the inter-frame over-drive third temperature segment data table OD Table3; the inter-row over-drive temperature segment data table includes the inter-row over-drive first temperature segment data table LOD Table1, the inter-row over-drive second temperature segment data table LOD Table2 and the inter-row over-drive third temperature segment data table LOD Table3; the multi-frequency gamma voltage correction temperature segment data table includes the multi-frequency gamma voltage correction first temperature segment data table VRRACC Table1, the multi-frequency gamma voltage correction second temperature segment data table VRRACC Table2 and the multi-frequency gamma voltage correction third temperature segment data table VRRACC Table3; the data delay compensation temperature segment data table includes the data delay compensation first temperature segment data table PPCC Table1, the data delay compensation second temperature segment data table PPCC Table2 and the data delay compensation third temperature segment data table PPCC Table3.

[0068] Furthermore, the first set of digital control instructions includes a first inter-frame overdrive digital control instruction, a first inter-row overdrive digital control instruction, a first multi-frequency gamma voltage correction digital control instruction, and a first data delay compensation digital control instruction. The second set of digital control instructions includes a second inter-frame overdrive digital control instruction, a second inter-row overdrive digital control instruction, a second multi-frequency gamma voltage correction digital control instruction, and a second data delay compensation digital control instruction. The third set of digital control instructions includes a third inter-frame overdrive digital control instruction, a third inter-row overdrive digital control instruction, a third multi-frequency gamma voltage correction digital control instruction, and a third data delay compensation digital control instruction. It should be noted that inter-frame overdrive (OD) is a voltage overdrive scheme used between frames to accelerate voltage changes and liquid crystal rotation speed. Inter-row overdrive (LOD) is a voltage overdrive scheme used to change data from the previous row to the next row within the same frame. Multi-frequency gamma voltage correction (VRRACC) is an operation that corrects the GMA values ​​of grayscales 0 to 255 for different frequencies after the gamma voltage (GAMMA) is fixed using a digital signal pattern. Data delay compensation (PPCC) is a compensation scheme used to compensate for the different delays of source data in different channels of the same driver chip due to inconsistent routing lengths. It is also a data delay compensation scheme between different driver chips and between driver chips at different distances.

[0069] Exemplarily, the driving voltage output module further includes a power management module PMIC and a gamma voltage control module PGMA. The power management module PMIC is configured to output a corresponding set of analog voltages to the gamma voltage control module PGMA and the display unit panel based on the determination result of the determination module JDG. The gamma voltage control module PGMA is configured to output a corresponding gamma voltage GAMMA to the display unit panel based on the determination result of the determination module JDG and the driving voltage output by the power management module PMIC.

[0070] It should be noted that theoretically, 256 gamma voltages GAMMA are provided for grayscales 0 to 255. However, in actual applications, in order to save costs, only the gamma voltages GAMMA of a few grayscale nodes are provided, and the remaining node voltages not provided are calculated using the multi-frequency gamma voltage correction temperature range data table VRRACC Table mentioned above.

[0071] When the JDG module determines that the driver chip's current temperature is in the first temperature range, the PMIC module outputs a first set of analog voltages, and the gamma voltage control module outputs a first gamma voltage, GAMMA1. When the JDG module determines that the driver chip's current temperature is in the second temperature range, the PMIC module outputs a second set of analog voltages, and the gamma voltage control module outputs a second gamma voltage, GAMMA2. When the JDG module determines that the driver chip's current temperature is in the third temperature range, the PMIC module outputs a third set of analog voltages, and the gamma voltage control module outputs a third gamma voltage, GAMMA3. By using different gamma voltages, the grayscale value of the display unit can be adjusted in a timely manner, preventing issues such as afterimages, flickering, and watermarks that can affect the display quality when the temperature changes.

[0072] Specifically, the control panel Tcon is connected to the gamma voltage control module PGMA and the power management module PMIC via the I2C communication protocol. The I2C protocol is a bidirectional, two-wire synchronous serial bus. It connects the judgment module JDG to the gamma voltage control module PGMA, and the judgment module JDG to the power management module PMIC, respectively, via two buses, forming a half-duplex communication mode. This connection method is low-cost, highly reliable, and widely applicable in many fields.

[0073] FIG3 is a schematic diagram of a voltage regulation system according to an embodiment of the present disclosure. As shown in FIG3 , the acquisition circuit 1 includes an acquisition resistor Rs, a first transistor N1, and a second transistor N2 disposed opposite the first transistor N1. The first transistor N1 and the second transistor N2 form a "current mirror" structure. The control electrodes of the first transistor N1 and the second transistor N2 are both connected to the first drive voltage V1 terminal. The node connecting the first electrode of the first transistor N1 and the first electrode of the second transistor N2 serves as the signal input terminal of the acquisition circuit 1, receiving the operating voltage V. The second electrode of the first transistor N1 is connected to the display unit of the display panel, and the second electrode of the second transistor N2 is connected to one end of the acquisition resistor Rs. The other end of the acquisition resistor Rs is connected to a reference ground. Specifically, the size of the second transistor N2 is N times that of the first transistor N1. That is, the current flowing through the first transistor N1 is N times the current flowing through the second transistor N2. This means that the second transistor N2 acts as a large resistor, collecting only a small portion of the operating current for subsequent determination, without affecting the original operating voltage V. Where N is greater than 1. The collected working current flows through the collection resistor Rs, so the collection voltage Vs collected at the connection node between the collection resistor Rs and the second electrode of the second transistor N2 is equal to the product of the working current and the resistance value of the collection resistor Rs.

[0074] Continuing with reference to Figure 3, the acquisition voltage Vs collected by the acquisition circuit 1 is transmitted to the signal input terminal of the comparison circuit. The comparison circuit includes a first comparison circuit 21 and a second comparison circuit 22. The first comparison circuit 21 includes a first operational amplifier OP1 and a third transistor N3. The non-inverting input terminal A of the first operational amplifier OP1 is multiplexed as the first input terminal of the first comparison circuit 21, connected to the first reference voltage Vref1 terminal. The inverting input terminal A' is multiplexed as the second input terminal of the first comparison circuit 21, connected to the second electrode of the second transistor N2 and the connection node of the acquisition resistor Rs. The output terminal is connected to the control electrode of the third transistor N3. Optionally, the first comparison circuit 21 also includes a first resistor R1, one end of the first resistor R1 is connected to the second drive voltage V2 terminal, and the other end is connected to the first electrode of the third transistor N3. The connection node between the first resistor R1 and the first electrode of the third transistor N3 is multiplexed as the first output terminal Output1 of the first comparison circuit 21. The second electrode of the third transistor N3 is connected to the reference ground.

[0075] The second comparison circuit 22 includes a second operational amplifier OP2 and a fourth transistor N4. The non-inverting input terminal B of the second operational amplifier OP2 is multiplexed as the third input terminal of the second comparison circuit 22, connected to the connection node between the second electrode of the second transistor N2 and the acquisition resistor Rs. The inverting input terminal B' is multiplexed as the fourth input terminal of the second comparison circuit 22, connected to the second reference voltage Vref2 terminal, and the output terminal is connected to the control electrode of the fourth transistor N4. Optionally, the second comparison circuit 22 also includes a second resistor R2, one end of the second resistor R2 is connected to the second drive voltage V2 terminal, and the other end is connected to the first electrode of the fourth transistor N4. The connection node between the second resistor R2 and the first electrode of the fourth transistor N4 is multiplexed as the second output terminal Output2 of the second comparison circuit 22. The second electrode of the fourth transistor N4 is connected to the reference ground.

[0076] When the sampled voltage Vs is greater than the first reference voltage Vref1, the first operational amplifier OP1 outputs a first control signal H, and the second operational amplifier OP2 outputs a second control signal L. When the sampled voltage Vs is less than the second reference voltage, the first operational amplifier OP1 outputs a second control signal L, and the second operational amplifier OP2 outputs a first control signal H. When the sampled voltage Vs is between the first reference voltage Vref1 and the second reference voltage Vref2, both the first operational amplifier OP1 and the second operational amplifier OP2 output a second control signal L. It should be understood that the above output states are limited to the connection method shown in the figure. When the first reference voltage Vref1 terminal is connected to the inverting input terminal of the first operational amplifier OP1, the output result also changes accordingly.

[0077] In some examples, the comparison circuit further includes an effective value conversion module RMS. As shown in FIG4 , the effective value conversion module RMS is connected between the acquisition circuit 1 and the comparison circuit. Specifically, the input end of the effective value conversion module RMS is connected to the second electrode of the second transistor N2 and the connection node of the sampling resistor. The output end of the effective value conversion module RMS is connected to the inverting input terminal A' of the first operational amplifier OP1 and the non-inverting input terminal B of the second operational amplifier OP2. When the input working signal is a pulse signal, its effective value voltage is first calculated by the effective value conversion module RMS before the next comparison is performed. The effective value conversion module RMS expands the application scope and application scenarios of the voltage regulation system.

[0078] Furthermore, the first output terminal Output1 of the first comparison circuit 21 and the second output terminal Output2 of the second comparison circuit 22 are respectively connected to the digital signal change circuit 3 via two input and output interfaces. Thus, when the first operational amplifier OP1 outputs the first control signal H and the second operational amplifier OP2 outputs the second control signal L, the digital signal change circuit 3 outputs a first readable signal, the judgment module JDG determines that the current temperature of the driver chip is in the first temperature range, the digital voltage control module calls the first temperature range data table Table1, the power management module PMIC outputs the first set of driving voltages, and the gamma voltage control module PGMA outputs the first gamma voltage GAMMA1.

[0079] When the first operational amplifier OP1 and the second operational amplifier OP2 both output the second control signal L, the digital signal change circuit 3 outputs a second readable signal, the judgment module JDG determines that the current temperature of the driver chip is in the second temperature zone, the digital voltage control module calls the second temperature zone data table Table2, the power management module PMIC outputs the second set of driving voltages, and the gamma voltage control module PGMA outputs the second gamma voltage GAMMA2.

[0080] When the first operational amplifier OP1 outputs the second control signal L and the second operational amplifier OP2 outputs the first control signal H, the digital signal change circuit 3 outputs a third readable signal. The judgment module JDG determines that the current temperature of the driver chip is in the third temperature range. The digital voltage control module accesses the third temperature range data table Table3. The power management module PMIC outputs a third set of driving voltages, and the gamma voltage control module PGMA outputs a third gamma voltage GAMMA3. Through the above acquisition, comparison, judgment, and output processes, the voltage signal can be promptly converted into a temperature signal and accessed from different temperature range data tables to perform a series of voltage adjustments, ultimately outputting a driving signal that matches the current temperature. After adjustment by the voltage regulation system, problems such as shaking head wrinkles, coarse grids, switching flicker, ghosting, and watermarks that are prone to occur during temperature changes can be effectively resolved. The following describes the operation of the voltage regulation system in the above embodiment, taking the second transistor N2 size as 10 times the size of the first transistor N1 (i.e., N=10), the sampling resistor Rs=100Ω, the first reference voltage Vref1=20V, and the second reference voltage Vref2=5V as an example. It is assumed that the collected working current I=1A, the current flowing through the second transistor N2 Is=I / N=1 / 10=0.1A, and the collected voltage Vs=Is*Rs=10V collected by the collection resistor Rs.

[0081] Next, the sampled voltage Vs flows into the first comparison circuit 21 and is compared with the second comparison circuit 22. The first comparison circuit 21 compares and finds that the sampled voltage Vs = 10V is less than the first reference voltage Vref1, and outputs the second control signal L through the first output terminal Output1, which is a low-level signal in this case. The second comparison circuit compares and finds that the sampled voltage Vs = 10V is greater than the second reference voltage Vref2, and outputs the first control signal H through the second output terminal Output2, which is a high-level signal in this case.

[0082] Next, after receiving the second control signal L output by the first output terminal Output1 and the first control signal H output by the second output terminal Output2, the digital change circuit 3 outputs a second readable signal to the judgment module JDG and the display unit Panel. The judgment module JDG determines that the current temperature of the driver chip is in the second temperature range.

[0083] Afterwards, the digital voltage control module calls multiple sets of second temperature zone data tables Table2 according to the judgment result of the judgment module JDG, and outputs the second set of digital control instructions to the display unit Panel. Among them, the second set of digital control instructions includes the second inter-frame overdrive digital control instruction, the second inter-row overdrive digital control instruction, the second multi-frequency gamma voltage correction digital control instruction and the second data delay compensation digital control instruction. Furthermore, the power management module PMIC outputs the second set of analog voltages according to the judgment result of the judgment module JDG. The gamma voltage control module PGMA outputs the second gamma voltage GAMMA2 to the display unit Panel according to the judgment result of the judgment module JDG and the second set of analog voltages output by the power management module PMIC.

[0084] At this point, the voltage regulation system has completed adaptive regulation when the driver chip temperature changes, and outputs the regulated digital instructions and analog voltage to the display unit Panel. The voltage regulation system of the present invention has high sensitivity, strong adaptability and long service life.

[0085] In a second aspect, an embodiment of the present disclosure provides a display panel comprising the above-mentioned voltage regulation system.

[0086] In some examples, the display panel further includes a gate driving circuit, and the signal end of each shift register in the gate driving circuit is connected to the driving voltage end output by the voltage regulation system.

[0087] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A voltage regulation system, comprising: A acquisition circuit configured to acquire the operating current of a display panel to generate a corresponding acquisition voltage; At least one comparison circuit configured to generate a control signal according to the acquisition voltage and a preset reference voltage; A digital signal change circuit configured to output a readable signal according to the control signals output by each of the comparison circuits; A driving voltage output circuit configured to determine the temperature range where a driving chip is located according to the readable signal and output a set of driving voltages corresponding to the temperature range.

2. The voltage regulation system according to claim 1, wherein, Comprising a first comparison circuit and a second comparison circuit; The first comparison circuit is configured to compare the acquisition voltage with a first reference voltage, and output a first control signal when it is compared that the acquisition voltage is greater than the first reference voltage, and output a second control signal when it is compared that the acquisition voltage is less than the first reference voltage; The second comparison circuit is configured to compare the acquisition voltage with a second reference voltage, and output the second control signal when it is compared that the acquisition voltage is greater than the first reference voltage, and output the first control signal when it is compared that the acquisition voltage is less than the second reference voltage; The first reference voltage is greater than the second reference voltage.

3. The voltage regulation system according to claim 2, wherein, The digital signal change circuit is configured to output a first readable signal when the first comparison circuit outputs the first control signal and the second comparison circuit outputs the second control signal; output a second readable signal when the first comparison circuit and the second comparison circuit both output the second control signal; output a third readable signal when the first comparison circuit outputs the second control signal and the second comparison circuit outputs the first control signal; The first readable signal indicates that the current temperature is in a first temperature range; the second readable signal indicates that the current temperature is in a second temperature range; the third readable signal indicates that the current temperature is in a third temperature range; The lowest temperature of the first temperature range is equal to the highest temperature of the second temperature range; the highest temperature of the second temperature range is equal to the highest temperature of the third temperature range.

4. The voltage regulation system according to claim 3, wherein, The driving voltage output circuit is configured to determine that the current temperature of the driving chip is in the first temperature range when the digital signal change circuit outputs the first readable signal, and output a first set of driving voltages; determine that the current temperature of the driving chip is in the second temperature range when the digital signal change circuit outputs the second readable signal, and output a second set of driving voltages; determine that the current temperature of the driving chip is in the third temperature range when the digital signal change circuit outputs the third readable signal, and output a third set of driving voltages.

5. The voltage regulation system according to claim 4, wherein, The driving signal output circuit includes a judgment module and a digital voltage driving module; the digital voltage control module includes multiple sets of temperature range data tables; The determination module is configured to determine that the current temperature of the driving chip is in the first temperature range when the digital signal change circuit is configured to output the first readable signal; determine that the current temperature of the driving chip is in the second temperature range when the digital signal change circuit outputs the second readable signal; and determine that the current temperature of the driving chip is in the third temperature range when the digital signal change circuit outputs the third readable signal. The digital voltage driving module is configured to call the first temperature range data table and output the first set of digital control instructions when the determination module determines that it is in the first temperature range; call the second temperature range data table and output the second set of digital control instructions when the determination module determines that it is in the second temperature range; and call the third temperature range data table and output the third set of digital control instructions when the determination module determines that it is in the third temperature range.

6. The voltage regulation system according to claim 5, wherein, The driving signal output circuit further includes a power management module and a gamma voltage control module; The power management module is configured to output the first set of analog voltages when the determination module determines that it is in the first temperature range; output the second set of analog voltages when the determination module determines that it is in the second temperature range; and output the third set of analog voltages when the determination module determines that it is in the third temperature range. The gamma voltage control module is configured to output the first gamma voltage when the determination module determines that it is in the first temperature range and the power management module outputs the first set of analog voltages; output the second gamma voltage when the determination module determines that it is in the second temperature range and the power management module outputs the second set of analog voltages; and output the third gamma voltage when the determination module determines that it is in the third temperature range and the power management module outputs the third set of analog voltages.

7. The voltage regulation system according to claim 5, wherein The digital voltage control module includes an inter-frame over-drive temperature range data table, an intra-line over-drive temperature range data table, a multi-frequency gamma voltage correction temperature range data table, and a data delay compensation temperature range data table.

8. The voltage regulation system according to claim 6, wherein, The determination module is communicatively connected to the gamma voltage control module and the power management module via I2C.

9. The voltage regulation system according to claim 2, wherein The first comparison circuit has a first input terminal, a second input terminal, and a first output terminal; the first input terminal is connected to the first reference voltage terminal, the second input terminal is connected to the acquisition circuit, and the first output terminal is connected to the digital signal change circuit; The second comparison circuit has a third input terminal, a fourth input terminal, and a second output terminal; the third input terminal is connected to the acquisition circuit, the fourth input terminal is connected to the second reference voltage terminal, and the second output terminal is connected to the digital signal change circuit.

10. The voltage regulation system according to claim 1, wherein, The acquisition circuit includes an acquisition resistor, a first transistor, and a second transistor disposed opposite to the first transistor; The control electrodes of the first transistor and the second transistor are both connected to the first driving voltage terminal; The connection node of the first pole of the first transistor and the first pole of the second transistor is multiplexed is the signal input terminal of the acquisition circuit, and inputs the working voltage; The second pole of the first transistor is connected to the display unit of the display panel. The second pole of the second transistor is connected to one end of the acquisition resistor, and the other end of the acquisition resistor is connected to the reference ground.

11. The voltage regulation system according to claim 10, wherein, The size of the second transistor is N times the size of the first transistor, and N is greater than 1.

12. The voltage regulation system according to claim 2, wherein, The first comparison circuit includes a first operational amplifier and a third transistor; The non-inverting input terminal of the first operational amplifier is multiplexed as the first input terminal of the first comparison circuit and is connected to the first reference voltage terminal. The inverting input terminal is multiplexed as the second input terminal of the first comparison circuit and is connected to the connection node between the second pole of the second transistor and the acquisition resistor. The output terminal is connected to the control pole of the third transistor.

13. The voltage regulation system according to claim 12, wherein, The first comparison circuit further includes a first resistor; One end of the first resistor is connected to the second drive voltage terminal, and the other end is connected to the first pole of the third transistor. The connection node between the first resistor and the first pole of the third transistor is multiplexed as the first output terminal of the first comparison circuit; The second pole of the third transistor is connected to the reference ground.

14. The voltage regulation system according to claim 2, wherein, The second comparison circuit includes a second operational amplifier and a fourth transistor; The non-inverting input terminal of the second operational amplifier is multiplexed as the third input terminal of the second comparison circuit and is connected to the connection node between the second pole of the second transistor and the acquisition resistor. The inverting input terminal is multiplexed as the fourth input terminal of the second comparison circuit and is connected to the second reference voltage terminal. The output terminal is connected to the control pole of the fourth transistor.

15. The voltage regulation system according to claim 14, wherein, The second comparison circuit further includes a second resistor; One end of the second resistor is connected to the second drive voltage terminal, and the other end is connected to the first pole of the fourth crystal tube. The connection node between the second resistor and the first pole of the fourth transistor is multiplexed as the second output terminal of the second comparison circuit; The second pole of the fourth transistor is connected to the reference ground.

16. The voltage regulation system according to claim 2, wherein, The comparison circuit further includes an effective value conversion module. The effective value conversion module is configured to convert the acquisition voltage into an effective value voltage; The input terminal of the effective value conversion module is connected to the connection node between the second pole of the second transistor and the acquisition resistor, and the output terminal is connected to the second input terminal of the first comparison circuit and the third input terminal of the second comparison circuit.

17. A display panel, which includes the voltage regulation system according to any one of claims 1-16.

18. The display panel according to claim 17, wherein, It further includes a gate driving circuit; The driving voltage output by the voltage regulation system is connected to the signal terminals of the shift registers in the gate driving circuit.

Images