Charge and discharge control circuit and display panel

Abstract

The present application discloses a charge-discharge control circuit and a display panel. The charge-discharge control circuit includes a judgment circuit, a first control structure corresponding to a positive polarity channel, and a second control structure corresponding to a negative polarity channel. The judgment circuit is configured to connect the first control structure and the second control structure, respectively, during a pre-charge and discharge period when a pre-processing condition is met. The first control structure is configured to charge a first capacitor after connection so that the voltage at the first capacitor reaches a first set voltage, the first set voltage being greater than a first initial voltage of the first capacitor before charging and less than a first target voltage. The second control structure is configured to discharge the second capacitor after connection so that the voltage at the second capacitor reaches a second set voltage, the second set voltage being less than a second initial voltage of the second capacitor before discharging and greater than a second target voltage. The present application can reduce the drive capability requirements for each control channel of the display panel, thereby reducing the area of ​​the corresponding drive amplifier.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a charge and discharge control circuit and a display panel. Background Art

[0002] The display panel realizes its display function through multiple pixel structures. Each pixel structure often includes sub-pixels corresponding to basic colors such as R (red), G (green), and B (blue). Each sub-pixel has a corresponding control channel. Each control channel is provided with a capacitor and a switch for controlling the charging and discharging of the capacitor, wherein the switch is used to turn on or off according to the control clock; for example, referring to Figure 1 As shown, Figure 1 Two control channels, Ch1 and Ch2, are shown. TP is the control clock. In the control clock TP, the switch is turned off during a high-level period to allow the control channel to write control data, and is turned on during a low-level period to allow the capacitor to charge and discharge according to the written control data, thereby controlling the corresponding sub-pixel to achieve functions such as luminescence.

[0003] The inventors studied the working process of each control channel and found that when the capacitor is charging or discharging, if the voltage difference before and after charging or discharging is too large (for example, greater than a certain threshold), the driver amplifier of the corresponding control channel requires a greater driving capability, and the corresponding driver amplifier area will also become larger, which may easily lead to a larger area of ​​the corresponding circuit and / or panel. Summary of the Invention

[0004] In view of this, the present application provides a charge and discharge control circuit and a display panel to solve the problem that the circuit and / or panel area corresponding to the traditional control channel is large.

[0005] The present application provides a charge and discharge control circuit, comprising a judgment circuit, a first control structure corresponding to a positive polarity channel, and a second control structure corresponding to a negative polarity channel;

[0006] The judgment circuit is used to connect the first control structure and the second control structure respectively during the pre-charge and discharge period when the pre-processing condition is met;

[0007] The first control structure is configured to charge the first capacitor of the positive polarity channel after being turned on so that the voltage at the first capacitor reaches a first set voltage, wherein the first set voltage is greater than a first initial voltage of the first capacitor before charging and less than a first target voltage that the first capacitor needs to reach;

[0008] The second control structure is used to discharge the second capacitor of the negative polarity channel after being turned on so that the voltage at the second capacitor reaches a second set voltage, where the second set voltage is less than a second initial voltage of the second capacitor before discharge and greater than a second target voltage that the second capacitor needs to reach.

[0009] Optionally, the preprocessing conditions include condition A and condition B; condition A: the voltage difference of the capacitor before and after charging and discharging is greater than a preset voltage; condition B: the number of channels that meet condition A is greater than or equal to the preset number of channels.

[0010] Optionally, the first control structure includes a first operational amplifier, a first voltage divider module and a first switch corresponding to each of the positive polarity channels; the first end of each of the first switches is used to access the first control data, the second end is respectively connected to the corresponding first capacitor and the output end of the first operational amplifier, and the third end is used to access the preprocessing control signal output by the judgment circuit; the first end of the first voltage divider module is used to access the first initial voltage, the second end is used to access the first target voltage, and the third end is connected to the first input end of the first operational amplifier; the second input end of the first operational amplifier is connected to the output end of the first operational amplifier.

[0011] Optionally, the first voltage divider module includes a first resistor and a second resistor; the first end of the first resistor serves as the first end of the first voltage divider module, for connecting to the first initial voltage, and the second end serves as the third end of the first voltage divider module, respectively connected to the first input end of the first op amp and the first end of the second resistor; the second end of the second resistor serves as the second end of the first voltage divider module, for connecting to the first target voltage.

[0012] Optionally, the first voltage divider module includes a first digital-to-analog converter and a first digital resistor module; the first end of the first digital resistor module serves as the first end of the first voltage divider module, for connecting to the first initial voltage, the second end serves as the second end of the first voltage divider module, for connecting to the first target voltage, and the third end is connected to the input end of the first digital-to-analog converter; the output end of the first digital-to-analog converter serves as the third end of the first voltage divider module, connected to the first input end of the first op amp.

[0013] Optionally, the second control structure includes a second op amp, a second voltage divider module and a second switch corresponding to each of the negative polarity channels; the first end of the second switch is used to access the second control data, the second end is respectively connected to the corresponding second capacitor and the output end of the second op amp, and the third end is used to access the preprocessing control signal output by the judgment circuit; the first end of the second voltage divider module is used to access the second initial voltage, the second end is used to access the second target voltage, and the third end is connected to the first input end of the second op amp; the second input end of the second op amp is connected to the output end of the second op amp.

[0014] Optionally, the second voltage divider module includes a third resistor and a fourth resistor; the first end of the third resistor serves as the first end of the second voltage divider module, for connecting to the second initial voltage, and the second end serves as the third end of the second voltage divider module, respectively connected to the first input end of the second op amp and the first end of the fourth resistor; the second end of the fourth resistor serves as the second end of the second voltage divider module, for connecting to the second target voltage.

[0015] Optionally, the second voltage divider module includes a second digital-to-analog converter and a second digital resistor module; the first end of the second digital resistor module serves as the first end of the second voltage divider module, for connecting to the second initial voltage, the second end serves as the second end of the second voltage divider module, for connecting to the second target voltage, and the third end is connected to the input end of the second digital-to-analog converter; the output end of the second digital-to-analog converter serves as the third end of the second voltage divider module, connected to the first input end of the second op amp.

[0016] Optionally, the charge and discharge control circuit also includes a third switch; the judgment circuit is used to send a neutralization control signal in the recovery period when the preprocessing condition is met to turn on the third switch; the first end of the third switch is connected to the positive polarity channel in a group of control channels, the second end is connected to the negative polarity channel in a group of control channels, and the third end is used to access the neutralization control signal to neutralize the charges of the first capacitor and the second capacitor in the corresponding group of control channels after being turned on.

[0017] The present application also provides a display panel, which includes any one of the above-mentioned charge and discharge control circuits.

[0018] In the above-mentioned charge and discharge control circuit and display panel of the present application, when the judgment circuit recognizes the preprocessing condition that the capacitors of each control channel need to be pre-charged in the current control cycle, the first control structure and the second control structure are respectively connected in the pre-charge and discharge period, so that the first control structure charges the first capacitor of the positive polarity channel after being connected, and the voltage at the first capacitor reaches the first set voltage before it is charged and discharged. After the second control structure is connected, it discharges the second capacitor of the negative polarity channel, and the voltage at the second capacitor reaches the second set voltage before it is charged and discharged. In this way, the first control structure can pre-charge the first capacitor before the charge and discharge control switch in the positive polarity channel is turned on, and the second control structure can pre-discharge the second capacitor before the charge and discharge control switch in the negative polarity channel is turned on. This can shorten the time for charging and discharging the corresponding capacitors after the subsequent charge and discharge control switches in each control channel are turned on, and reduce the requirements for the corresponding driving capabilities, thereby reducing the area of ​​the corresponding driving amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of control channel related signals during the research process of this application;

[0021] Figure 2 This is a schematic diagram of the charge and discharge control circuit structure of an embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of signal changes related to the charge and discharge control circuit according to an embodiment of the present application;

[0023] Figure 4 This is a schematic diagram of the charge and discharge control circuit structure of another embodiment of the present application;

[0024] Figure 5 This is a schematic diagram of the charge and discharge control circuit structure of another embodiment of the present application;

[0025] Figure 6 This is a schematic diagram of the charge and discharge control circuit structure of another embodiment of the present application;

[0026] Figure 7 This is a schematic diagram of the charge and discharge control circuit structure of another embodiment of the present application;

[0027] Figure 8 This is a schematic diagram of the charge and discharge control circuit structure of another embodiment of the present application;

[0028] Figure 9 This is a schematic diagram of signal changes related to the charge and discharge control circuit of another embodiment of the present application. DETAILED DESCRIPTION

[0029] The following, in conjunction with the accompanying drawings, clearly and completely describes the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and their technical features can be combined with each other.

[0030] In a first aspect, the present application provides a charge-discharge control circuit, which is disposed within a display panel and can be used to control the charging and discharging of capacitors on positive and negative polarity channels in the display panel to enable corresponding sub-pixels to achieve display functions. Specifically, the display panel includes multiple control channels, where adjacent control channels have opposite polarity, for example, odd-numbered control channels are positive polarity channels, even-numbered control channels are negative polarity channels, and so on.

[0031] refer to Figure 2 As shown, the charge and discharge control circuit includes a judgment circuit (not shown in the figure), a first control structure 100 corresponding to the positive polarity channel and a second control structure 200 corresponding to the negative polarity channel.

[0032] The judgment circuit is configured to output a pre-processing control signal for activating the first control structure 100 and the second control structure 200 during a pre-charge / discharge period when a pre-processing condition is met, thereby activating the first control structure 100 and the second control structure 200, respectively. Optionally, the pre-processing condition includes a requirement to pre-charge the capacitors of each control channel during the current control cycle to bring the voltages at the capacitors closer to the corresponding target voltages. Optionally, the judgment circuit can be implemented using an intelligent control chip such as an MCU (microcontroller unit); alternatively, the judgment circuit can be implemented using a circuit structure such as a logic device, adder, and / or counter that mutually assists in identifying the pre-processing condition. Optionally, the pre-charge / discharge period can include the period when each control channel is writing corresponding control data. During this period, the charge / discharge control switches of each control channel are disconnected, and the voltages at the first capacitor C1 and the second capacitor C2 are at the corresponding initial voltages.

[0033] The first control structure 100 is used to charge the first capacitor C1 of the positive polarity channel after being turned on, so that the voltage at the first capacitor C1 reaches a first set voltage V01, wherein the first set voltage V01 is greater than the first initial voltage VG1 of the first capacitor C1 before charging, and less than the first target voltage VG7 that the first capacitor C1 needs to reach. The first control structure 100 can pre-charge the first capacitor C1 before the charge and discharge control switch in the positive polarity channel is turned on, so that the voltage at the first capacitor C1 reaches the first set voltage V01 that is closer to the first target voltage VG7. This can shorten the time for charging the first capacitor C1 after the subsequent charge and discharge control switch in the positive polarity channel is turned on, and reduce the requirements for the corresponding driving capability, thereby reducing the area of ​​the corresponding driving amplifier. Figure 2In the figure, odd-numbered control channels such as Ch1, Ch3, ..., Chn-1 are positive polarity channels, where n is an even number. S1 is the charge and discharge control switch for the positive polarity channel Ch1, S3 is the charge and discharge control switch for the positive polarity channel Ch3, ..., Sn-1 is the charge and discharge control switch for the positive polarity channel Chn-1. Optionally, the first set voltage V01 can be a value intermediate between the first initial voltage VG1 and the first target voltage VG7.

[0034] The second control structure 200 is used to discharge the second capacitor C2 of the negative polarity channel after being turned on, so that the voltage at the second capacitor C2 reaches a second set voltage V02. The second set voltage V02 is less than the second initial voltage VG8 of the second capacitor C2 before discharge, and is greater than the second target voltage VG14 that the second capacitor C2 needs to reach. The second control structure 200 can pre-discharge the second capacitor C2 before the charge and discharge control switch in the negative polarity channel is turned on, so that the voltage at the second capacitor C2 reaches the second set voltage V02 that is closer to the second target voltage VG14. This can shorten the time for discharging the second capacitor C2 after the subsequent charge and discharge control switch in the negative polarity channel is turned on, and reduce the requirements for the corresponding driving capability, thereby reducing the area of ​​the corresponding driving amplifier. Figure 2 In the example, even-numbered control channels such as Ch2, Ch4, ..., Chn are negative polarity channels, where n is an even number. S2 is the charge and discharge control switch for the positive polarity channel Ch2, S4 is the charge and discharge control switch for the positive polarity channel Ch4, ..., Sn is the charge and discharge control switch for the positive polarity channel Chn.

[0035] Specifically, the pretreatment conditions include condition A and condition B.

[0036] Condition A includes: the voltage difference between the capacitor before and after charging or discharging is greater than a preset voltage. Optionally, the preset voltage may be half the voltage difference between the first target voltage VG7 and the first initial voltage VG1, or half the voltage difference between the second initial voltage VG8 and the second target voltage VG14. A voltage difference between the capacitor before and after charging or discharging that is greater than the preset voltage indicates that the voltage difference between the capacitor before and after charging or discharging is too large, requiring a higher drive capability for the corresponding control channel's driver amplifier.

[0037] Condition B includes: the number of channels (including positive polarity channels and negative polarity channels) that meet condition A is greater than or equal to the preset number of channels. Optionally, the preset number of channels can be set to a value equal to ⅔ of the total number of control channels in the display panel. The number of channels that meet condition A is greater than or equal to the preset number of channels, indicating that in the corresponding control cycle, the voltage difference between the capacitors of most control channels before and after charging or discharging is too large, and the drive amplifiers of these control channels require greater driving capability. In this case, the first control structure 100 and the second control structure 200 are respectively connected during the pre-charge and discharge period, so that the first control structure 100 charges the first capacitor C1 during the pre-charge and discharge period, and the second control structure 200 discharges the second capacitor C2 during the pre-charge and discharge period. This pre-controls the capacitance of each control channel to be closer to the corresponding target voltage, which can shorten the subsequent capacitor charging time and weaken the corresponding driving capability requirements.

[0038] Optionally, refer to Figure 3 As shown, each control channel can work according to the control clock TP1. If the judgment circuit recognizes the preprocessing condition, the first control structure 100 and the second control structure 200 are respectively turned on during the pre-charge and discharge period. The first control structure 100 pre-charges the first capacitor C1 during the pre-charge and discharge period so that the voltage at the first capacitor C1 reaches the first set voltage V01. The second control structure 200 pre-discharges the second capacitor C2 during the pre-charge and discharge period so that the voltage at the second capacitor C2 reaches the second set voltage V02. After the pre-charge and discharge period, the judgment circuit turns off the first control structure 100 and the second control structure 200 respectively, and each control channel turns on the charge and discharge control switch therein, and charges and discharges the corresponding capacitor according to the corresponding control data so that the corresponding capacitors all reach the corresponding target voltage.

[0039] Optionally, when the judgment circuit recognizes that the corresponding control cycle meets the pre-processing condition, it can also output a pre-processing control signal for connecting the first control structure 100 and the second control structure 200 during the recovery period, so as to connect the first control structure 100 and the second control structure 200 respectively. Figure 3 As shown, the first control structure 100 can pre-discharge the first capacitor C1 during the recovery period so that the voltage at the first capacitor C1 changes from the first target voltage VG7 to the first set voltage V01 in advance, so as to shorten the time for subsequently discharging the first capacitor C1 to the first initial voltage VG1 in the positive polarity channel; the second control structure 200 can pre-charge the second capacitor C2 during the recovery period so that the voltage at the second capacitor C2 changes from the second target voltage VG14 to the first set voltage V01 in advance, so as to shorten the time for subsequently charging the second capacitor C2 to the second initial voltage VG8 in the negative polarity channel.

[0040] In the above-mentioned charge and discharge control circuit, when the judgment circuit recognizes a pre-processing condition that requires pre-charging the capacitors of each control channel in the current control cycle, the first control structure 100 and the second control structure 200 are respectively connected during the pre-charge and discharge period, so that the first control structure 100 charges the first capacitor C1 of the positive polarity channel after being connected, and the voltage at the first capacitor C1 reaches the first set voltage V01 before it is charged or discharged. After being connected, the second control structure 200 discharges the second capacitor C2 of the negative polarity channel, and the voltage at the second capacitor C2 reaches the second set voltage V02 before it is charged or discharged. In this way, the first control structure 100 can pre-charge the first capacitor C1 before the charge and discharge control switch in the positive polarity channel is turned on, and the second control structure 200 can pre-discharge the second capacitor C2 before the charge and discharge control switch in the negative polarity channel is turned on. This can shorten the time for charging and discharging the corresponding capacitors after the charge and discharge control switches in each control channel are turned on, and reduce the requirements for the corresponding driving capabilities, thereby reducing the area of ​​the corresponding driving amplifier.

[0041] In some embodiments, reference Figure 4 As shown, the first control structure 100 includes a first operational amplifier 110, a first voltage divider module 120 and a first switch 130 corresponding to each of the positive polarity channels;

[0042] The first end of each first switch 130 is used to receive the first control data, the second end is connected to the corresponding first capacitor C1 and the output of the first op amp 110, and the third end is used to receive the pre-processing control signal output by the judgment circuit. The first end of the first voltage divider module 120 is used to receive the first initial voltage VG1, the second end is used to receive the first target voltage VG7, and the third end is connected to the first input of the first op amp 110. The second input of the first op amp 110 is connected to the output of the first op amp 110. The first control data is the control data corresponding to the positive polarity channel.

[0043] Optionally, the first end of the first capacitor C1 is connected to the second end of the first switch 130, and the second end can be used to receive a preset signal such as a set potential. The first voltage divider module 120 and the first operational amplifier 110 cooperate with each other to provide a corresponding voltage signal to the first capacitor C1 after the first switch 130 is turned on, so that the first capacitor C1 can reach the first set voltage V01 during the pre-charge and discharge period.

[0044] Optionally, the first switch 130 includes a first MOS transistor M1 and a second MOS transistor M2. The preprocessing control signal output by the judgment circuit includes a first signal corresponding to the gate of the first MOS transistor M1 and a second signal corresponding to the gate of the second MOS transistor M2. The gate of the first MOS transistor M1 is used to receive the first signal; the source of the first MOS transistor M1 serves as the first end of the first switch 130 and is connected to the drain of the second MOS transistor M2; the drain of the first MOS transistor M1 serves as the second end of the first switch 130 and is connected to the source of the second MOS transistor M2; and the gate of the second MOS transistor M2 is used to receive the second signal. Optionally, the first MOS transistor M1 is an NMOS transistor, and the second MOS transistor M2 is a PMOS transistor.

[0045] In some examples, reference Figure 5 As shown, the first voltage divider module 120 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 serves as the first end of the first voltage divider module 120, for receiving the first initial voltage VG1, and the second end serves as the third end of the first voltage divider module 120, connected to the first input end of the first op amp 110 and the first end of the second resistor R2 respectively; the second end of the second resistor R2 serves as the second end of the first voltage divider module 120, for receiving the first target voltage VG7. Optionally, the resistance values ​​of the first resistor R1 and the second resistor R2 can be set according to the voltage division requirements of the first voltage divider module 120. For example, the resistance values ​​of the first resistor R1 and the second resistor R2 can be equal.

[0046] In some examples, reference Figure 6 As shown, the first voltage divider module 120 includes a first digital-to-analog converter DAC1 and a first digital resistor module 121. The first terminal of the first digital resistor module 121 serves as the first terminal of the first voltage divider module 120, for receiving the first initial voltage VG1. The second terminal of the first digital resistor module 121 serves as the second terminal of the first voltage divider module 120, for receiving the first target voltage VG7. The third terminal is connected to the input terminal of the first digital-to-analog converter DAC1. The output terminal of the first digital-to-analog converter DAC1 serves as the third terminal of the first voltage divider module 120, and is connected to the first input terminal of the first op amp 110.

[0047] Optionally, the first digital resistance module 121 may divide the first initial voltage VG1 and the first target voltage VG7 and output them according to the voltage division requirement of the first voltage division module 120 .

[0048] In some embodiments, reference Figure 4As shown, the second control structure includes a second op amp 210, a second voltage divider module 220, and a second switch 230 corresponding to each negative polarity channel. The first end of the second switch 230 is used to receive the second control data, the second end is respectively connected to the corresponding second capacitor C2 and the output of the second op amp 210, and the third end is used to receive the pre-processing control signal output by the judgment circuit. The first end of the second voltage divider module 220 is used to receive the second initial voltage VG8, the second end is used to receive the second target voltage VG14, and the third end is connected to the first input of the second op amp 210. The second input of the second op amp 210 is connected to the output of the second op amp 210. The second control data is the control data corresponding to the negative polarity channel.

[0049] Optionally, the first end of the second capacitor C2 is connected to the second end of the second switch 230, and the second end can be used to receive a preset signal such as a set potential. The second voltage divider module 220 and the second op amp 210 cooperate with each other to provide a corresponding voltage signal to the second capacitor C2 after the second switch 230 is turned on, so that the second capacitor C2 reaches the second set voltage V02 during the pre-charge and discharge period.

[0050] Optionally, the second switch 230 includes a third MOS transistor M3 and a fourth MOS transistor M4. The preprocessing control signal output by the judgment circuit includes a first signal corresponding to the gate of the third MOS transistor M3 and a second signal corresponding to the gate of the fourth MOS transistor M4. The gate of the third MOS transistor M3 is used to receive the first signal; the source of the third MOS transistor M3 serves as the first end of the second switch 230 and is connected to the drain of the fourth MOS transistor M4; the drain of the third MOS transistor M3 serves as the second end of the second switch 230 and is connected to the source of the fourth MOS transistor M4; and the gate of the fourth MOS transistor M4 is used to receive the second signal. Optionally, the third MOS transistor M3 is an NMOS transistor, and the fourth MOS transistor M4 is a PMOS transistor.

[0051] In some examples, reference Figure 5 As shown, the second voltage divider module 220 includes a third resistor R3 and a fourth resistor R4. The first end of the third resistor R3 serves as the first end of the second voltage divider module 220, for receiving the second initial voltage VG8, and the second end serves as the third end of the second voltage divider module 220, connected to the first input end of the second op amp 210 and the first end of the fourth resistor R4, respectively. The second end of the fourth resistor R4 serves as the second end of the second voltage divider module 220, for receiving the second target voltage VG14. Optionally, the resistance values ​​of the third resistor R3 and the fourth resistor R4 can be set according to the voltage division requirements of the first voltage divider module 120. For example, the resistance values ​​of the third resistor R3 and the fourth resistor R4 can be equal.

[0052] In some examples, reference Figure 6As shown, the second voltage divider module 220 includes a second digital-to-analog converter DAC2 and a second digital resistor module 221. The first end of the second digital resistor module 221 serves as the first end of the second voltage divider module 220, for receiving the second initial voltage VG8. The second end serves as the second end of the second voltage divider module 220, for receiving the second target voltage VG14. The third end is connected to the input end of the second digital-to-analog converter DAC2. The output end of the second digital-to-analog converter DAC2 serves as the third end of the second voltage divider module 220, and is connected to the first input end of the second operational amplifier 210.

[0053] Optionally, the second digital resistance module 221 may divide the second initial voltage VG8 and the second target voltage VG14 and output them according to the voltage division requirement of the second voltage division module 220 .

[0054] In some embodiments, reference Figure 7 As shown, the charge and discharge control circuit further includes a third switch 300 .

[0055] The judgment circuit is configured to send a neutralization control signal during a recovery period when the pre-processing condition is met, so as to turn on the third switch 300 during the recovery period. In a display panel, two adjacent control channels form a group of control channels. For example, the first control channel Ch1 and the second control channel Ch2 form a group of control channels, the third control channel Ch3 and the fourth control channel Ch4 form a group of control channels, ..., and the n-1th control channel Ch n-1 and the nth control channel Chn form a group of control channels.

[0056] The first end of the third switch 300 is connected to the positive polarity channel in a group of control channels, the second end is connected to the negative polarity channel in a group of control channels, and the third end is used to receive the neutralization control signal to neutralize the charges of the first capacitor C1 and the second capacitor C2 in the corresponding group of control channels after being turned on, so that the voltages corresponding to the first capacitor C1 and the second capacitor C2 are closer to the corresponding target voltages.

[0057] Optionally, the third switch 300 includes a fifth MOS transistor M5 and a sixth MOS transistor M6. The neutralization control signal includes a third signal corresponding to the gate of the fifth MOS transistor M5 and a fourth signal corresponding to the gate of the sixth MOS transistor M6. The gate of the fifth MOS transistor M5 is used to receive the third signal. The drain serves as the first terminal of the third switch 300 and is connected to the source of the sixth MOS transistor M6. The source serves as the second terminal of the third switch 300 and is connected to the drain of the sixth MOS transistor M6. The gate of the sixth MOS transistor M6 is used to receive the fourth signal. Optionally, the fifth MOS transistor M5 is an NMOS transistor, and the sixth MOS transistor M6 is a PMOS transistor.

[0058] Optionally, refer to Figure 8As shown, each control channel is also provided with a regulating resistor Rp corresponding to the third switch 300 to regulate and / or limit the current of the corresponding control channel. In the positive polarity channel, the first end of the regulating resistor Rp is connected to the first end of the third switch 300, and the second end is connected to the first end of the first capacitor C1. In the negative polarity channel, the first end of the regulating resistor Rp is connected to the second end of the third switch 300, and the second end is connected to the first end of the second capacitor C2.

[0059] Specifically, the third switch 300 can neutralize the charges of the first capacitor C1 and the second capacitor C2 in the corresponding group of control channels after being turned on. Figure 9 As shown, Figure 9 The figure shows the change characteristics of the capacitor voltage when the capacitor of the control channel is not charged and is charged during the recovery period. Figure 9 Characterization shows that after the charges of the first capacitor C1 and the second capacitor C2 in each group of control channels are neutralized, the voltages corresponding to the first capacitor C1 and the second capacitor C2 can approach the corresponding target voltage more quickly, which can further reduce the requirements for the corresponding driving capability, thereby reducing the area of ​​the corresponding driving amplifier.

[0060] In the above charge and discharge control circuit, when the judgment circuit identifies the pre-processing condition that the capacitors of each control channel need to be pre-charged in the current control cycle, the first control structure 100 and the second control structure 200 are respectively turned on during the pre-charge and discharge period, so that the first control structure 100 charges the first capacitor C1 of the positive polarity channel after being turned on, and the voltage at the first capacitor C1 reaches the first set voltage V01 before it is charged and discharged. After the second control structure 200 is turned on, it discharges the second capacitor C2 of the negative polarity channel, and the voltage at the second capacitor C2 reaches the second set voltage V02 before it is charged and discharged. In this way, the first control structure 100 can pre-charge the first capacitor C1 before the charge and discharge control switch in the positive polarity channel is turned on, and the second control structure 200 can pre-discharge the second capacitor C2 before the charge and discharge control switch in the negative polarity channel is turned on. This can shorten the time for charging and discharging the corresponding capacitors after the subsequent charge and discharge control switches in each control channel are turned on, and reduce the requirements for the corresponding driving capabilities, thereby reducing the area of ​​the corresponding driving amplifier.

[0061] A second aspect of the present application provides a display panel, which includes the charge and discharge control circuit described in any one of the above embodiments.

[0062] Optionally, refer to Figures 2 to 8As shown, the display panel also includes a third operational amplifier and a charge-discharge control switch corresponding to each control channel, for example, a third operational amplifier Chi and a charge-discharge control switch Si corresponding to the i-th control channel, where i is an integer greater than or equal to 1 and less than or equal to n. In a positive polarity channel, the first input terminal of the third operational amplifier is used to receive first control data, and the second input terminal is respectively connected to the output terminal of the third operational amplifier and the first terminal of the charge-discharge control switch; the second terminal of the charge-discharge control switch is used to output the first control data. In a negative polarity channel, the first input terminal of the third operational amplifier is used to receive second control data, and the second input terminal is respectively connected to the output terminal of the third operational amplifier and the first terminal of the charge-discharge control switch; the second terminal of the charge-discharge control switch is used to output the second control data.

[0063] The above-mentioned display panel includes the charge and discharge control circuit described in any of the above-mentioned embodiments, and has all the beneficial effects of the charge and discharge control circuit described in any of the above-mentioned embodiments, which will not be repeated here.

[0064] Although the present application has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. This application includes all such modifications and variations and is limited only by the scope of the appended claims. In particular, with respect to the various functions performed by the components described above, the terms used to describe such components are intended to correspond to any component (unless otherwise indicated) that performs the designated function of the component (e.g., which is functionally equivalent), even if the structure is not identical to the disclosed structure that performs the function in the exemplary implementation of this specification shown herein.

[0065] That is, the above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural or equivalent process transformations made using the contents of the description and drawings of this application, such as the mutual combination of technical features between the various embodiments, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

[0066] In addition, in the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, for structural elements with the same or similar characteristics, the present application may use the same or different reference numerals to identify them. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0067] In this application, the word "exemplary" is used to mean "serving as an example, illustration or description". Any embodiment described in this application as "exemplary" is not necessarily to be construed as being more preferred or more advantageous than other embodiments. The above description is provided to enable any person skilled in the art to implement and use the present application. In the above description, various details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other embodiments, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

Claims

1. A charge and discharge control circuit, characterized in that: The charge and discharge control circuit includes a judgment circuit, a first control structure corresponding to the positive polarity channel, and a second control structure corresponding to the negative polarity channel; The judgment circuit is used to connect the first control structure and the second control structure respectively during the pre-charge and discharge period when the pre-processing condition is met; The first control structure is configured to charge the first capacitor of the positive polarity channel after being turned on so that the voltage at the first capacitor reaches a first set voltage, wherein the first set voltage is greater than a first initial voltage of the first capacitor before charging and less than a first target voltage that the first capacitor needs to reach; The second control structure is used to discharge the second capacitor of the negative polarity channel after being turned on so that the voltage at the second capacitor reaches a second set voltage, where the second set voltage is less than a second initial voltage of the second capacitor before discharge and greater than a second target voltage that the second capacitor needs to reach.

2. The charge and discharge control circuit according to claim 1, wherein: The pretreatment conditions include condition A and condition B; Condition A: The voltage difference between the capacitor before and after charging and discharging is greater than the preset voltage; Condition B: The number of channels that meet condition A is greater than or equal to the preset number of channels.

3. The charge and discharge control circuit according to claim 1, wherein: The first control structure includes a first operational amplifier, a first voltage divider module, and a first switch corresponding to each of the positive polarity channels; The first end of each first switch is used to access the first control data, the second end is respectively connected to the corresponding first capacitor and the output end of the first operational amplifier, and the third end is used to access the preprocessing control signal output by the judgment circuit; the first end of the first voltage divider module is used to access the first initial voltage, the second end is used to access the first target voltage, and the third end is connected to the first input end of the first operational amplifier; the second input end of the first operational amplifier is connected to the output end of the first operational amplifier.

4. The charge and discharge control circuit according to claim 3, characterized in that: The first voltage dividing module includes a first resistor and a second resistor; The first end of the first resistor serves as the first end of the first voltage divider module, and is used to connect to the first initial voltage. The second end of the first resistor serves as the third end of the first voltage divider module, and is respectively connected to the first input end of the first op amp and the first end of the second resistor. The second end of the second resistor serves as the second end of the first voltage divider module, and is used to connect to the first target voltage.

5. The charge and discharge control circuit according to claim 3, characterized in that: The first voltage divider module includes a first digital-to-analog converter and a first digital resistance module; The first end of the first digital resistor module serves as the first end of the first voltage divider module, and is used to connect to the first initial voltage. The second end of the first digital resistor module serves as the second end of the first voltage divider module, and is used to connect to the first target voltage. The third end of the first digital resistor module is connected to the input end of the first digital-to-analog converter. The output end of the first digital-to-analog converter serves as the third end of the first voltage divider module, and is connected to the first input end of the first op amp.

6. The charge and discharge control circuit according to claim 1, wherein: The second control structure includes a second operational amplifier, a second voltage divider module, and a second switch corresponding to each of the negative polarity channels; The first end of the second switch is used to access the second control data, the second end is respectively connected to the corresponding second capacitor and the output end of the second operational amplifier, and the third end is used to access the preprocessing control signal output by the judgment circuit; the first end of the second voltage divider module is used to access the second initial voltage, the second end is used to access the second target voltage, and the third end is connected to the first input end of the second operational amplifier; the second input end of the second operational amplifier is connected to the output end of the second operational amplifier.

7. The charge and discharge control circuit according to claim 6, characterized in that: The second voltage dividing module includes a third resistor and a fourth resistor; The first end of the third resistor serves as the first end of the second voltage divider module, and is used to connect to the second initial voltage. The second end of the third resistor serves as the third end of the second voltage divider module, and is respectively connected to the first input end of the second op amp and the first end of the fourth resistor; the second end of the fourth resistor serves as the second end of the second voltage divider module, and is used to connect to the second target voltage.

8. The charge and discharge control circuit according to claim 6, wherein: The second voltage dividing module includes a second digital-to-analog converter and a second digital resistance module; The first end of the second digital resistor module serves as the first end of the second voltage divider module, for connecting to the second initial voltage; the second end serves as the second end of the second voltage divider module, for connecting to the second target voltage; and the third end is connected to the input end of the second digital-to-analog converter; the output end of the second digital-to-analog converter serves as the third end of the second voltage divider module, and is connected to the first input end of the second op amp.

9. The charge and discharge control circuit according to claim 1, wherein: The charge and discharge control circuit further includes a third switch; The judgment circuit is configured to send a neutralization control signal during a recovery period to turn on the third switch when a pre-processing condition is met; The first end of the third switch is connected to a positive polarity channel in a group of control channels, the second end is connected to a negative polarity channel in a group of control channels, and the third end is used to receive the neutralization control signal to neutralize the charges of the first capacitor and the second capacitor in the corresponding group of control channels after being turned on.

10. A display panel, characterized in that: The display panel includes the charge and discharge control circuit according to any one of claims 1 to 9.

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