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] This disclosure belongs to the field of display technology, specifically relating to a voltage regulation system and a display panel. Background Technology

[0002] In existing technologies, thermistors are typically used to measure and monitor the temperature of the driver chip on the display panel. However, the nonlinear relationship between thermistors and temperature increases the difficulty and complexity of the measurement, and thermistors suffer from severe aging and poor stability.

[0003] To address the aforementioned problems, this invention discloses a voltage regulation system. After acquiring the operating current, it compares it with a preset reference voltage to obtain a control signal. A temperature judgment module determines the current temperature of the driver chip based on the control signal, and a voltage driving module outputs voltages from different temperature ranges based on the judgment result. This voltage regulation system exhibits high sensitivity, long service life, and the ability to promptly detect changes in the driver chip temperature and output adjusted driving voltages to adapt to the changing temperature.

[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 to provide a voltage regulation system and a display panel.

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

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

[0008] At least one comparator circuit is configured to generate a control signal based on the acquired voltage and a preset reference voltage;

[0009] A digital signal modification circuit is configured to output a readable signal based on the control signal output by each of the comparison circuits;

[0010] The drive voltage output circuit is configured to determine the temperature range of the drive chip based on the readable signal, and output a set of drive voltages corresponding to that temperature range.

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

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

[0013] The second comparison circuit is configured to compare the acquired voltage with a second reference voltage, and output the second control signal when the acquired voltage is found to be greater than the first reference voltage, and output the first control signal when the acquired 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 modification 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; to output a second readable signal when both the first comparison circuit and the second comparison circuit output the second control signal; and to 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 a first temperature range; the second readable signal indicates that the current temperature is in a second temperature range; and the third readable signal indicates that the current temperature is in a third temperature range.

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

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

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

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

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

[0022] Preferably, the drive 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 judgment module determines that the temperature is in a first temperature range; output a second set of analog voltages when the judgment module determines that the temperature is in a second temperature range; and output a third set of analog voltages when the judgment module determines that the temperature is in a 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 a first temperature range and the power management module outputs a first set of analog voltages; to output a second gamma voltage when the judgment module determines that the temperature is in a second temperature range and the power management module outputs a second set of analog voltages; and to output a third gamma voltage when the judgment module determines that the temperature is in a third temperature range and the power management module outputs a third set of analog voltages.

[0025] Preferably, the digital voltage control module includes an inter-frame overdrive temperature segment data table, an inter-line overdrive 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 a first reference voltage terminal, the second input terminal is connected to a data acquisition circuit, and the first output terminal is connected to a digital signal conversion 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 modification circuit.

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

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

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

[0032] The second terminal of the first transistor is connected to the display unit of the display panel, the second terminal of the second transistor is connected to one end of the acquisition resistor, and the other end of the acquisition resistor is connected to 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 comparator circuit includes a first operational amplifier and a third transistor;

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

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

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

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

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

[0044] Preferably, the comparison circuit further includes an RMS conversion module; the RMS conversion module is configured to convert the acquired voltage into an RMS voltage.

[0045] The input terminal of the RMS conversion module is connected to the connection node between the second electrode 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.

[0046] Secondly, this disclosure provides a display panel that includes the voltage regulation system described above.

[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 each shift register in the gate drive circuit. Attached Figure Description

[0049] Figure 1 is a block diagram of a voltage regulation system provided in this disclosure;

[0050] Figure 2 is a block diagram of another voltage regulation system provided in this disclosure;

[0051] Figure 3 is a partial structural schematic diagram of a voltage regulation system provided in this disclosure;

[0052] Figure 4 is a partial structural schematic diagram of another voltage regulation system provided in this disclosure. Detailed Implementation

[0053] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0055] Before describing the embodiments of this disclosure, it should be noted that the operating voltage acquired by the acquisition circuit in these embodiments can be a positive voltage signal or a negative voltage signal, and optionally, it can also be a pulse signal. In these embodiments, only a positive voltage signal is used as an example for explanation. However, it should be understood that this does not constitute a limitation on the scope of protection of these embodiments. Furthermore, the control signal in these embodiments 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 as the second control signal. Optionally, the transistor in these embodiments can be a thin-film transistor, a field-effect transistor, or other devices with similar characteristics. The switching characteristics of the transistor in these embodiments can be N-type or P-type. In these embodiments, only an N-type transistor is used to describe the circuit in this application.

[0056] In this embodiment, the source and drain of each transistor are structurally identical and interchangeable. The terminology used here is to distinguish the two terminals (excluding the gate), with one terminal referred to as the source and the other as the drain. The first terminal can be the source, and the second terminal can be the drain. For an N-type transistor, the transistor is turned on when a high-level signal is input to the gate and turned off when a low-level signal is input to the gate. For a P-type transistor, the transistor is turned on when a low-level signal is input to the gate and turned off when a high-level signal is input to the gate.

[0057] Temperature has a significant impact on all aspects of display panels. In the prior art, thermistors are typically used to measure the temperature of the driver chip on the display panel. However, thermistors have poor stability and serious aging problems. Based on this, the following solutions are proposed in the embodiments of this disclosure.

[0058] In a first aspect, embodiments of this disclosure provide a voltage regulation system. This system collects the operating current I, converts it into a collected voltage Vs, and compares it with a preset reference voltage. It can promptly determine the current temperature range of the driver chip and adjust each drive signal according to the temperature range to output a set of digital and analog voltages adapted to the external temperature. Figure 1 is a block diagram of the voltage regulation system provided in this disclosure. As shown in Figure 1, the voltage regulation system includes a data acquisition circuit 1, at least one comparison circuit, a digital signal conversion circuit 3, and a drive voltage output circuit 4. The data acquisition circuit 1 is configured to collect the operating current I of the display panel and generate a corresponding collected voltage Vs. The comparison circuit is configured to generate a first control signal H or a second control signal L based on the collected voltage Vs and the preset reference voltage. The digital signal conversion circuit 3 is configured to output readable signals to the drive voltage output circuit 4 and the display unit Panel according to each control signal. The drive voltage output circuit 4 includes a judgment module JDG and a digital voltage control module. The digital voltage control module includes multiple sets of temperature range data tables. The judgment module JDG is configured to determine the temperature range of the driver chip based on the readable signal. The digital voltage control module is configured to call the corresponding temperature range data table based on 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 comparator circuit with a first input terminal and a second input terminal. One of these input terminals is connected to a reference voltage terminal, and the other is connected to a data acquisition circuit 1. The data acquisition circuit 1 compares the acquired 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 segments based on the control signals output by each comparator circuit and determines which temperature segment the current temperature belongs to. Optionally, when the voltage regulation system includes one comparator circuit (i.e., only one reference voltage terminal is connected), the judgment module JDG divides the temperature range into two temperature segments. When the voltage regulation system includes two comparator circuits (i.e., a first comparator circuit 21 and a second comparator circuit 22), the first comparator circuit 21 and the second comparator 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 segments based on this pair of control signals: a first temperature segment, a second temperature segment, and a third temperature segment. In this system, the lowest temperature of the first temperature zone is set to equal the highest temperature of the second temperature zone, and the lowest temperature of the second temperature zone is set to equal the highest temperature of the third temperature zone. Similarly, the comparison circuit can be designed to include more comparison circuits, dividing the system into more temperature zones to achieve accurate temperature determination. In the following embodiments, the voltage regulation system of this disclosure is described using only two comparison circuits as an example.

[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. The first input terminal Input1 is connected to the first reference voltage Vref1, 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. 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, 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 the sampled voltage Vs and finds it to be greater than the first reference voltage Vref1, and outputs the first control signal H. The second comparison circuit 22 compares the sampled voltage Vs and finds it to be greater than the second reference voltage Vref2, and outputs the second control signal L. The digital signal conversion circuit 3 outputs the 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 the sampled voltage Vs and finds it to be less than the first reference voltage Vref1, and outputs the second control signal L. The second comparison circuit 22 compares the sampled voltage Vs and finds it to be greater than the second reference voltage Vref2, and outputs the second control signal L. The digital signal conversion 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 the sampled voltage Vs and finds it to be less than the first reference voltage Vref1, and outputs the second control signal L. The second comparison circuit 22 compares the sampled voltage Vs and finds it to be less than the second reference voltage Vref2, and outputs the first control signal H. The digital signal changing circuit 3 outputs the third readable signal, and the judgment module JDG determines that the current temperature of the driver chip is in the third temperature range.

[0064] Optionally, in the above embodiments, 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 signals output by the two comparator circuits will change accordingly. Furthermore, when more than two comparator circuits are included, more reference voltage terminals need to be connected, thereby dividing more temperature ranges and improving the sensitivity of the voltage regulation system to temperature changes.

[0065] In some examples, the digital voltage control module includes multiple sets of temperature segment data tables. Each set of temperature segment data tables includes a first temperature segment data table (Table1), a second temperature segment data table (Table2), and a third temperature segment data table (Table3). Table1 includes the temperature range corresponding to the first temperature segment and a first digital control instruction. Table2 includes the temperature range corresponding to the second temperature segment and a second digital control instruction. Table3 includes the temperature range corresponding to the third temperature segment and a third digital control instruction. Furthermore, multiple first digital control instructions from the multiple sets of temperature segment data tables constitute a first set of digital control instructions, multiple second digital control instructions constitute a second set of digital control instructions, and multiple third digital control instructions constitute a third set of digital control instructions.

[0066] Once the JDG (Determination Controller) module determines the current temperature range of the driver chip, the digital voltage control module calls multiple corresponding first, second, or third temperature range data tables and outputs a set of corresponding digital control instructions. Specifically, when the JDG module determines that the driver chip's current temperature is in the first temperature range, the digital voltage control module calls multiple first temperature range data tables (Table1) and outputs the first set of digital control instructions; when the JDG module determines that the driver chip's current temperature is in the second temperature range, the digital voltage control module calls multiple second temperature range data tables (Table2) and outputs the second set of digital control instructions; and when the JDG module determines that the driver chip's current temperature is in the third temperature range, the digital voltage control module calls multiple third temperature range data tables (Table3) and outputs the third set of digital control instructions.

[0067] Optionally, the digital voltage control module includes an inter-frame overdrive temperature segment data table, an inter-line overdrive temperature segment data table, a multi-frequency gamma voltage correction temperature segment data table, and a data delay compensation temperature segment data table. The data tables for inter-frame overdrive temperature segments include OD Table1, OD Table2, and OD Table3; the data tables for inter-line overdrive temperature segments include LOD Table1, LOD Table2, and LOD Table3; the data tables for inter-line overdrive temperature segments include VRRACC Table1, VRRACC Table2, and VRRACC Table3; and the data tables for data delay compensation temperature segments include PPCC Table1, PPCC Table2, and PPCC Table3.

[0068] Furthermore, the first set of digital control instructions includes the first inter-frame overdrive digital control instruction, the first inter-line overdrive digital control instruction, the first multi-frequency gamma voltage correction digital control instruction, and the first data delay compensation digital control instruction. The second set of digital control instructions includes the second inter-frame overdrive digital control instruction, the second inter-line overdrive digital control instruction, the second multi-frequency gamma voltage correction digital control instruction, and the second data delay compensation digital control instruction. The third set of digital control instructions includes the third inter-frame overdrive digital control instruction, the third inter-line overdrive digital control instruction, the third multi-frequency gamma voltage correction digital control instruction, and the 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-line overdrive (LOD) is a voltage overdrive scheme used for data changes from one line to the next within the same frame. Multi-frequency gamma voltage correction (VRRACC) is an operation that corrects the GMA values ​​of gray levels 0-255 through a digital signal mode for different frequencies after the gamma voltage (GAMMA) is fixed. 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 trace lengths, as well as data delay compensation schemes between different driver chips and between driver chips at different distances.

[0069] For example, the drive voltage output module further includes a power management module (PMIC) and a gamma voltage control module (PGMA). The PMIC is configured to output a set of analog voltages to the PGMA and the display panel based on the judgment result of the judgment module (JDG). The PGMA is configured to output a corresponding gamma voltage (GAMMA) to the display panel based on the judgment result of the JDG and the drive voltage output by the PMIC.

[0070] It should be noted that the 0-255 grayscale theory requires 256 gamma voltages (GAMMA). However, in practical applications, to save costs, only a few grayscale nodes' GAMMA are provided. The remaining unspecified node voltages are calculated using the aforementioned multi-frequency gamma voltage correction temperature range data table (VRRACC Table).

[0071] Specifically, when the judgment module JDG determines that the current temperature of the driver chip is in the first temperature range, the power management module PMIC outputs the first set of analog voltages, and the gamma voltage control module outputs the first gamma voltage GAMMA1. When the judgment module JDG determines that the current temperature of the driver chip is in the second temperature range, the power management module PMIC outputs the second set of analog voltages, and the gamma voltage control module outputs the second gamma voltage GAMMA2. When the judgment module JDG determines that the current temperature of the driver chip is in the third temperature range, the power management module PMIC outputs the third set of analog voltages, and the gamma voltage control module outputs the third gamma voltage GAMMA3. By calling different gamma voltages (GAMMA), the grayscale value of the display unit can be adjusted in a timely manner to prevent problems such as image retention, screen flickering, and watermarks from occurring when the temperature changes, thus affecting the display effect.

[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. The decision module JDG and the gamma voltage control module PGMA, as well as the decision module JDG and the power management module PMIC, are connected via two separate buses, forming a half-duplex communication mode. This connection method is low-cost, highly reliable, and can be widely used in many fields.

[0073] Figure 3 is a schematic diagram of the voltage regulation system according to an embodiment of this disclosure. As shown in Figure 3, the acquisition circuit 1 includes an acquisition resistor Rs, a first transistor N1, and a second transistor N2 disposed opposite to the first transistor N1. The first transistor N1 and the second transistor N2 form a "current mirror" structure. The control terminals of both the first transistor N1 and the second transistor N2 are connected to the first driving voltage V1. The connection node between the first terminals of the first transistor N1 and the second transistor N2 is multiplexed as the signal input terminal of the acquisition circuit 1, receiving the operating voltage V. The second terminal of the first transistor N1 is connected to the display unit of the display panel, and the second terminal 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 reference ground. Specifically, the size of the second transistor N2 is N times that of the first transistor N1, meaning the current flowing through the first transistor N1 is N times the current flowing through the second transistor N2. In other words, the second transistor N2 acts as a large resistor, acquiring only a small portion of the operating current for subsequent judgment and not affecting the original operating voltage V. Here, N is greater than 1. The collected operating current flows through the collection resistor Rs. Therefore, the collection voltage Vs collected at the connection node between the collection resistor Rs and the second terminal of the second transistor N2 is equal to the product of the operating current and the resistance value of the collection resistor Rs.

[0074] Referring again to Figure 3, the acquisition voltage Vs acquired by acquisition circuit 1 is transmitted to the signal input terminal of the comparator circuit. The comparator circuit includes a first comparator circuit 21 and a second comparator circuit 22. The first comparator 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 comparator 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 comparator circuit 21, connected to the connection node between the second terminal of the second transistor N2 and the acquisition resistor Rs. The output terminal is connected to the control terminal of the third transistor N3. Optionally, the first comparator circuit 21 also includes a first resistor R1. One end of the first resistor R1 is connected to the second driving voltage V2 terminal, and the other end is connected to the first terminal of the third transistor N3. The connection node between the first resistor R1 and the first terminal of the third transistor N3 is multiplexed as the first output terminal Output1 of the first comparator circuit 21. The second terminal of the third transistor N3 is connected to reference ground.

[0075] The second comparator circuit 22 includes a second operational amplifier OP2 and a fourth transistor N4. The non-inverting input B of the second operational amplifier OP2 is multiplexed as the third input of the second comparator circuit 22, connecting the second terminal of the second transistor N2 to the junction of the acquisition resistor Rs. The inverting input B' is multiplexed as the fourth input of the second comparator circuit 22, connecting to the second reference voltage Vref2. The output is connected to the control terminal of the fourth transistor N4. Optionally, the second comparator circuit 22 further includes a second resistor R2. One end of the second resistor R2 is connected to the second driving voltage V2, and the other end is connected to the first terminal of the fourth transistor N4. The junction of the second resistor R2 and the first terminal of the fourth transistor N4 is multiplexed as the second output terminal Output2 of the second comparator circuit 22. The second terminal of the fourth transistor N4 is connected to reference ground.

[0076] When the sampled voltage Vs is greater than the first reference voltage Vref1, the first operational amplifier OP1 outputs the first control signal H, and the second operational amplifier OP2 outputs the second control signal L. When the sampled voltage Vs is less than the second reference voltage, the first operational amplifier OP1 outputs the second control signal L, and the second operational amplifier OP2 outputs the 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 the second control signal L. It should be understood that the above output states are only applicable 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 will also change accordingly.

[0077] In some examples, the comparison circuit also includes an RMS (Real-Signal Module), as shown in Figure 4. The RMS is connected between the acquisition circuit 1 and the comparison circuit. Specifically, the input terminal of the RMS is connected to the junction of the second transistor N2 and the sampling resistor. The output terminal of the RMS is connected to the inverting input A' of the first operational amplifier OP1 and the non-inverting input B of the second operational amplifier OP2. When the input signal is a pulse signal, the RMS calculates its effective voltage value before proceeding to the next comparison step. The RMS increases the application range and scenarios of the voltage regulation system.

[0078] Furthermore, the first output terminal Output1 of the first comparator circuit 21 and the second output terminal Output2 of the second comparator circuit 22 are respectively connected to the digital signal conversion circuit 3 through two input / 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 conversion circuit 3 outputs a first readable signal. The judgment module JDG determines that the current temperature of the driver chip is within 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 drive voltages, and the gamma voltage control module PGMA outputs the first gamma voltage GAMMA1.

[0079] When both the first operational amplifier OP1 and the second operational amplifier OP2 output the second control signal L, the digital signal conversion circuit 3 outputs the second readable signal, the judgment module JDG determines that the current temperature of the driver chip is in the second temperature range, the digital voltage control module calls the second temperature range 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 conversion circuit 3 outputs the 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 calls the third temperature range data table Table3, the power management module PMIC outputs the third set of drive voltages, and the gamma voltage control module PGMA outputs the third gamma voltage GAMMA3. Through the above acquisition, comparison, judgment, and output process, the voltage signal can be converted into a temperature signal in a timely manner, and different temperature range data tables can be called to perform a series of voltage adjustments, ultimately outputting a drive signal that matches the current temperature. After adjustment by the voltage regulation system, problems such as head-shaking patterns, coarse grids, switching flicker, ghosting, and watermarks that easily occur when the temperature changes. The following describes the working process of the voltage regulation system in the above embodiment using the example that the size of the second transistor N2 is 10 times that 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. The operating current for data acquisition is set to I = 1A, the current flowing through the second transistor N2 is Is = I / N = 1 / 10 = 0.1A, and the acquisition voltage Vs obtained by the acquisition resistor Rs is Is * Rs = 10V.

[0081] Next, the sampled voltage Vs flows into the first comparison circuit 21 and the second comparison circuit 22 for comparison. The first comparison circuit 21 compares the sampled voltage Vs = 10V, which is less than the first reference voltage Vref1, and outputs the second control signal L (low level signal) through the first output terminal Output1. The second comparison circuit compares the sampled voltage Vs = 10V, which is greater than the second reference voltage Vref2, and outputs the first control signal H (high level signal) through the second output terminal Output2.

[0082] Next, after receiving the second control signal L from the first output terminal Output1 and the first control signal H from 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] Subsequently, the digital voltage control module, based on the judgment result of the judgment module JDG, calls multiple sets of second temperature segment data tables (Table2) and outputs a second set of digital control instructions to the display unit Panel. These second set of digital control instructions include a second inter-frame overdrive digital control instruction, a second inter-line overdrive digital control instruction, a second multi-frequency gamma voltage correction digital control instruction, and a second data delay compensation digital control instruction. Further, the power management module PMIC outputs a second set of analog voltages based on the judgment result of the judgment module JDG. The gamma voltage control module PGMA, based on the judgment result of the judgment module JDG and the second set of analog voltages output by the power management module PMIC, outputs a second gamma voltage (GAMMA2) to the display unit Panel.

[0084] At this point, the voltage regulation system has completed its adaptive adjustment in response to changes in the driver chip temperature, and outputs the adjusted digital command and analog voltage to the display panel. The voltage regulation system of this invention features high sensitivity, strong adaptability, and a long service life.

[0085] Secondly, embodiments of this disclosure provide a display panel that includes the voltage regulation system described above.

[0086] In some examples, the display panel also includes a gate drive circuit, in which the signal terminals of each shift register are connected to the drive voltage output by the voltage regulation system.

[0087] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A voltage regulating system, comprising: a collection circuit configured to collect a working current of a display panel to generate a corresponding collection voltage; at least one comparison circuit configured to generate a control signal according to the collection voltage and a preset reference voltage; a digital signal changing circuit configured to output a readable signal according to the control signal output by each comparison circuit; a driving voltage output circuit configured to determine a temperature section in which a driving chip is located according to the readable signal, and output a group of driving voltages corresponding to the temperature section.

2. The voltage regulation system of claim 1, wherein, comprising a first comparison circuit and a second comparison circuit; the first comparison circuit is configured to compare the collection voltage with a first reference voltage, and output a first control signal when the collection voltage is greater than the first reference voltage, and output a second control signal when the collection voltage is less than the first reference voltage; the second comparison circuit is configured to compare the collection voltage with a second reference voltage, and output the second control signal when the collection voltage is greater than the first reference voltage, and output the first control signal when the collection voltage is less than the second reference voltage; the first reference voltage is greater than the second reference voltage. 3.The voltage regulating system of claim 2, wherein 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 the first comparison circuit and the second comparison circuit both 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; the first readable signal represents that the current temperature is in a first temperature section; the second readable signal represents that the current temperature is in a second temperature section; and the third readable signal represents that the current temperature is in a third temperature section; the lowest temperature of the first temperature section is equal to the highest temperature of the second temperature section; and the highest temperature of the second temperature section is equal to the highest temperature of the third temperature section. 4.The voltage regulating system of 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 section when the digital signal changing circuit outputs the first readable signal, and output a first group of driving voltages; determine that the current temperature of the driving chip is in the second temperature section when the digital signal changing circuit outputs the second readable signal, and output a second group of driving voltages; and determine that the current temperature of the driving chip is in the third temperature section when the digital signal changing circuit outputs the third readable signal, and output a third group of driving voltages.

5. The voltage regulation system of claim 4, wherein, the driving signal output circuit comprises a judging module and a digital voltage driving module; and the digital voltage control module comprises a plurality of temperature section data tables. The judgment module is configured to determine that the current temperature of the driving chip is in a first temperature section when the digital signal changing circuit outputs the first readable signal, determine that the current temperature of the driving chip is in a second temperature section when the digital signal changing circuit outputs the second readable signal, and determine that the current temperature of the driving chip is in a third temperature section when the digital signal changing circuit outputs the third readable signal. The digital voltage driving module is configured to call a first temperature section data table to output a first group of digital control instructions when the judgment module determines that the current temperature is in the first temperature section, call a second temperature section data table to output a second group of digital control instructions when the judgment module determines that the current temperature is in the second temperature section, and call a third temperature section data table to output a third group of digital control instructions when the judgment module determines that the current temperature is in the third temperature section.

6. The voltage regulation system of claim 5, wherein, The driving signal output circuit further comprises a power management module and a gamma voltage control module. The power management module is configured to output a first group of analog voltages when the judgment module determines that the current temperature is in the first temperature section, output a second group of analog voltages when the judgment module determines that the current temperature is in the second temperature section, and output a third group of analog voltages when the judgment module determines that the current temperature is in the third temperature section. The gamma voltage control module is configured to output a first gamma voltage when the judgment module determines that the current temperature is in the first temperature section and the power management module outputs the first group of analog voltages, output a second gamma voltage when the judgment module determines that the current temperature is in the second temperature section and the power management module outputs the second group of analog voltages, and output a third gamma voltage when the judgment module determines that the current temperature is in the third temperature section and the power management module outputs the third group of analog voltages.

7. The voltage regulation system of claim 5, wherein, The digital voltage control module comprises an interframe overdrive temperature section data table, an interline overdrive temperature section data table, a multi-frequency gamma voltage correction temperature section data table, and a data delay compensation temperature section data table.

8. The voltage regulation system of claim 6, wherein, The judgment module is connected to the gamma voltage control module and the power management module through I2C communication.

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

10. The voltage regulation system of claim 1, wherein, The acquisition circuit comprises an acquisition resistor, a first transistor, and a second transistor arranged opposite to the first transistor. The control electrode of the first transistor and the control electrode of the second transistor are both connected to a first driving voltage end. The first electrode of the first transistor and the first electrode of the second transistor are connected to each other The signal input end of the collection circuit is inputted with the working voltage. The second electrode of the first transistor is connected with a display unit of the display panel, the second electrode of the second transistor is connected with one end of the collection resistor, and the other end of the collection resistor is connected with a reference ground.

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

12. The voltage regulation system of claim 2, wherein, The first comparison circuit comprises a first operational amplifier and a third transistor. The non-inverting input end of the first operational amplifier is multiplexed as a first input end of the first comparison circuit and is connected with the first reference voltage end, the inverting input end is multiplexed as a second input end of the first comparison circuit and is connected with the connection node of the second electrode of the second transistor and the collection resistor, and the output end is connected with the control electrode of the third transistor.

13. The voltage regulation system of claim 12, wherein, The first comparison circuit further comprises a first resistor. One end of the first resistor is connected with the second driving voltage end, the other end is connected with the first electrode of the third transistor, and the connection node of the first resistor and the first electrode of the third transistor is multiplexed as a first output end of the first comparison circuit. The second electrode of the third transistor is connected with the reference ground.

14. The voltage regulation system of claim 2, wherein, The second comparison circuit comprises a second operational amplifier and a fourth transistor. The non-inverting input end of the second operational amplifier is multiplexed as a third input end of the second comparison circuit and is connected with the connection node of the second electrode of the second transistor and the collection resistor, the inverting input end is multiplexed as a fourth input end of the second comparison circuit and is connected with the second reference voltage end, and the output end is connected with the control electrode of the fourth transistor.

15. The voltage regulation system of claim 14, wherein, The second comparison circuit further comprises a second resistor. One end of the second resistor is connected with the second driving voltage end, the other end is connected with the first electrode of the fourth transistor, and the connection node of the second resistor and the first electrode of the fourth transistor is multiplexed as a second output end of the second comparison circuit. The second electrode of the fourth transistor is connected with the reference ground. The comparison circuit further comprises an effective value conversion module, and the effective value conversion module is configured to convert the collection voltage into an effective value voltage.

16. The voltage regulation system of claim 2, wherein, The input end of the effective value conversion module is connected with the connection node of the second electrode of the second transistor and the collection resistor, and the output end is connected with the second input end of the first comparison circuit and the third input end of the second comparison circuit. 17.A display panel comprising the voltage regulation system according to any one of claims 1-16. The display panel further comprises a gate driving circuit.

18. The display panel of claim 17, wherein, The driving voltage outputted by the voltage regulation system is connected with a signal end of each shift register in the gate driving circuit. ​

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