Display panel, driving method thereof and display device

Abstract

The application discloses a display panel, a driving method thereof and a display device. A bias power supply circuit is used to provide a bias power supply for a source amplifier, so that the source amplifier is provided with a proper bias power supply according to a data voltage corresponding to picture data. The bias power supply is not excessive for the data voltage which does not need high power consumption, thereby avoiding energy waste, and realizing stable working of the source amplifier in an amplification state and effective reduction of power consumption of the source amplifier.

Description

TECHNICAL FIELD

[0001] The present application generally relates to the technical field of display, and in particular to a display panel, a driving method thereof and a display device. BACKGROUND

[0002] In the panel display technology, the main function of the source driver is to output a target data voltage Vsource to the source of the TFT (Thin-Film Transistor) when the gate driver opens the TFT on the display panel row by row, so as to charge and discharge the display capacitor on the display panel to the required gray scale voltage, to drive the transistor deflection, so that the pixel electrode displays the target brightness.

[0003] In the related art, a technical solution is provided for saving the power consumption of the gate driving circuit. However, for driving the panel, there is not only the power consumption of the gate driver, but also the power consumption of the source driver. According to experimental tests, the power consumption of the source driver is not less than that of the gate driver. Therefore, saving the power consumption of the source driver becomes a problem to be solved. SUMMARY

[0004] In view of the above defects or deficiencies in the prior art, it is desirable to provide a display panel, a driving method thereof and a display device, which can provide a bias power supply for the source driver based on the actual data voltage, realize adaptive component power supply, and effectively reduce the power consumption of the source driver.

[0005] In a first aspect, the present application provides a display panel, comprising:

[0006] a driving circuit, configured to receive picture data and generate a data voltage according to the picture data;

[0007] a source amplifier, comprising an input end, an output end and a power supply end, the input end of the source amplifier being connected with the driving circuit, the output end of the source amplifier being connected with a target pixel to be driven, configured to receive the data voltage and output a target data voltage to the target pixel to be driven;

[0008] a bias power supply circuit, comprising an input end and an output end, the input end of the bias power supply circuit being connected with the driving circuit, the output end of the bias power supply circuit being connected with the power supply end of the source amplifier, configured to provide a bias power supply corresponding to the data voltage for the source amplifier.

[0009] In some embodiments, the bias power supply circuit provides a plurality of bias power supplies corresponding to a plurality of power supply currents.

[0010] In some embodiments, the bias power supply circuit comprises a control sub-circuit, the control sub-circuit being further configured to:

[0011] comparing a first data voltage corresponding to a current frame and a second data voltage corresponding to a previous frame to obtain a comparison result;

[0012] controlling the bias power supply to provide the source amplifier according to the comparison result, so that a variation of the bias power supply is consistent with a variation rule of data voltages of adjacent two frames.

[0013] In some embodiments, the control sub-circuit is further configured to:

[0014] control a power supply current corresponding to the bias power supply to change in a positive direction of the comparison result.

[0015] In some embodiments, the control sub-circuit is further configured to:

[0016] obtain a first difference between the first data voltage and a reference voltage and a second difference between the second data voltage and the reference voltage, respectively;

[0017] control a variation amount of the bias power supply by controlling a plurality of control gears according to the first difference and the second difference.

[0018] In some embodiments, the driving circuit includes a plurality of driving channels, each of the driving channels being configured to output a channel data voltage, and the bias power supply circuit includes a comparison sub-circuit configured to:

[0019] sequentially compare the channel data voltages output by the plurality of driving channels, and take a maximum one of the channel data voltages as a first data voltage corresponding to a current frame.

[0020] In some embodiments, the comparison sub-circuit includes a first transistor and a second transistor,

[0021] a gate of the first transistor and a gate of the second transistor are connected, and a reference voltage is connected thereto;

[0022] a second end of the first transistor is connected to one of the channel data voltages to be compared, and a second end of the second transistor is connected to another of the channel data voltages to be compared;

[0023] a first end of the first transistor and a first end of the second transistor are connected, and output a larger one of the channel data voltages.

[0024] In some embodiments, the driving circuit includes:

[0025] a latch configured to latch and output a gray scale voltage data corresponding to the picture data, and a timing control signal;

[0026] A level converter, connected to the latch, is used to convert the grayscale voltage data into levels and output it.

[0027] A gamma voltage generator is used to generate a gamma compensation voltage based on the image data.

[0028] A digital-to-analog converter, connected to the level converter and the gamma voltage generator, is used to select the corresponding gamma compensation voltage based on the grayscale voltage data and generate the data voltage.

[0029] Secondly, this application provides a method for driving a display panel, the method comprising:

[0030] The driving circuit receives screen data and generates a data voltage based on the screen data;

[0031] The bias power supply circuit provides a bias power supply to the source amplifier that matches the data voltage;

[0032] The source amplifier receives the data voltage and outputs the target voltage to the target pixel to be driven.

[0033] Thirdly, this application provides a display device including at least one display panel as described in any of the above descriptions.

[0034] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0035] The display panel, driving method, and display device provided in this application embodiment provide a bias power supply that matches the data voltage to the source amplifier through a bias power supply circuit. This allows for the provision of a suitable bias power supply to the source amplifier based on the data voltage corresponding to the screen data, avoiding the provision of excessive bias power to data voltages that do not require large power consumption, thus preventing energy waste. This ensures that the source amplifier operates stably in the amplification state while effectively reducing the power consumption of the source amplifier. Attached Figure Description

[0036] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0037] Figure 1 A schematic diagram of the structure of a display device provided for an embodiment of this application;

[0038] Figure 2 A schematic diagram of the structure of a source driver in a display device provided for an embodiment of this application;

[0039] Figure 3 A schematic diagram of the structure of the GAMMA compensation circuit provided for an embodiment of this application;

[0040] Figure 4 A schematic diagram of the structure of a display panel provided for an embodiment of this application;

[0041] Figure 5 A schematic diagram of a source bias power supply circuit provided for an embodiment of this application;

[0042] Figure 6 A schematic diagram of a control sub-circuit provided for an embodiment of this application;

[0043] Figure 7 A schematic diagram illustrating the relationship between control level and power supply current, provided for an embodiment of this application;

[0044] Figure 8 A schematic diagram of another source bias power supply circuit provided for an embodiment of this application;

[0045] Figure 9 A schematic diagram of a comparator circuit provided for an embodiment of this application;

[0046] Figure 10 A flowchart of a display panel driving method provided for an embodiment of this application. Detailed Implementation

[0047] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0048] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0049] For ease of description, the driving device and driving method of the display panel provided in this embodiment will be used in applications such as... Figure 1 The following explanation uses the displayed device as an example. See also... Figure 1 The display device according to the embodiments of the application can be implemented as an electroluminescent display device or a liquid crystal display device, which includes a display panel, a timing controller (TCON), a source-driver integrated circuit (S-IC), and a gate on array (GOA).

[0050] The display panel can provide multiple data lines DL and multiple gate lines GL, and multiple pixels P can be arranged in multiple intersection areas between the gate lines GL and the data lines DL. A pixel array can be provided in the display area of ​​the display panel by arranging the pixels P in a matrix type. The multiple data lines DL extend along the column direction, and the multiple gate lines GL extend along the row direction. Each data line DL connects to one column of array pixels P, and each gate line GL connects to one row of pixels P. The multiple data lines DL write data voltage into the pixel units P row by row.

[0051] In the embodiments of this application, the display panel can be a liquid crystal display panel (LCD), an organic light-emitting diode (OLED) display panel, an electronic paper display panel (E-paper), etc. An LCD panel is used as an example here; other types of panels can be deduced similarly.

[0052] The timing controller TCON can be used to provide multiple preset timing control signals TSg and TSs (such as start signal (STV signal), horizontal synchronization signal (HSYNC signal), vertical synchronization signal (VSYNC signal), and multiple clock signals required for operation, but not limited to these) to control the operating timing of the gate driver GOA and the source driver S-IC. Furthermore, the timing controller TCON can also generate image data DATA based on the received image signal and provide the image data DATA to the source driver S-IC.

[0053] The gate driver GOA is controlled by the timing control signal provided by the timing controller TCON to provide a scan signal to sequentially turn on / scan each row of pixels on the display panel.

[0054] The source driver S-IC has multiple drive channels S_1 to S_n. These multiple drive channels S_1 to S_n receive screen data DATA and timing control signals provided by the timing controller TCON, thereby coordinating with the turn-on timing of each column of pixels to convert the screen data DATA into target data voltages S1 to Sn to provide to the display panel.

[0055] Figure 2 This is a schematic diagram of the structure of a source driver in a display device provided for an embodiment of this application. (Reference) Figure 2 The source driver S-IC may include a latch, a level shifter (L / S), a gamma block, a digital-to-analog converter (D / A), and a source amplifier (SOP).

[0056] The latch is used to receive voltage data corresponding to the image data DATA and timing control signals from the timing controller.

[0057] The level converter L / S is connected to the latch and is used to convert voltage data and output it.

[0058] A gamma voltage generator is used to generate gamma compensation voltage based on the image data (DATA). Figure 3 The GAMMA compensation circuit provided in the embodiments of this application is used to generate a gamma compensation voltage.

[0059] The digital-to-analog converter (D / A) is connected to a level converter and a gamma voltage generator to select the corresponding gamma compensation voltage based on the voltage data and generate the data voltage.

[0060] The source amplifier SOP is used to convert the data voltage into the target data voltage Vsource of the final output.

[0061] Figure 4 This is a schematic diagram of the structure of a display panel provided for an embodiment of this application. (Reference) Figure 4 The display panel provided in this application embodiment includes: a driving circuit 10, a source amplifier 20, and a bias power supply circuit 30.

[0062] The driving circuit 10 is used to receive screen data and generate data voltage based on the screen data.

[0063] The source amplifier 20 includes an input terminal, an output terminal, and a power supply terminal. The input terminal of the source amplifier 20 is connected to the driving circuit 10, and the output terminal of the source amplifier 20 is connected to the target pixel to be driven. It is used to receive data voltage and output target data voltage to the target pixel to be driven.

[0064] The bias power supply circuit 30 includes an input terminal and an output terminal. The input terminal of the bias power supply circuit 30 is connected to the drive circuit 10, and the output terminal of the bias power supply circuit 30 is connected to the power supply terminal of the source amplifier 20, which is used to provide the source amplifier 20 with a bias power supply that matches the data voltage.

[0065] It should be understood that the drive circuit 10 includes at least a latch, a level converter (L / S), a gamma voltage generator, and a digital-to-analog converter (D / A) in the source driver S-IC, in order to receive screen data and generate corresponding data voltages based on the screen data.

[0066] The source amplifier 20 is a voltage amplifier circuit that uses a transistor as the core component for amplification. In related technologies, a sufficiently high power supply is typically provided to the collector of the transistor to reverse bias the collector junction, ensuring that the transistor operates in the amplification state. Therefore, this application proposes to provide a bias power supply to the source amplifier that matches the data voltage through a bias power supply circuit. This allows for the provision of a suitable bias power supply to the source amplifier based on the data voltage corresponding to the image data, avoiding excessive bias power supply for data voltages that do not require significant power consumption, thus preventing energy waste. This achieves both stable operation of the source amplifier in the amplification state and effective reduction of the source amplifier's power consumption.

[0067] In one feasible embodiment of this application, the bias power supply circuit provides multiple bias power supplies that correspond one-to-one with multiple supply currents.

[0068] In other words, since the core transistor of the source amplifier needs to be kept in amplification mode, the bias power supply circuit needs to provide a stable power supply voltage for the source amplifier. Factors affecting power loss include voltage and current. Therefore, this application configures multiple selectable supply currents for the bias power supply circuit so that the bias power supply selects an appropriate supply current according to the data voltage, so as to provide appropriate amplification energy to the source amplifier within one display cycle.

[0069] In one embodiment of this application, such as Figure 5 As shown, the bias power supply circuit 30 includes a control sub-circuit 31.

[0070] The control sub-circuit 31 is used to compare the first data voltage corresponding to the current frame with the second data voltage corresponding to the previous frame to obtain a comparison result; based on the comparison result, it controls the supply of bias power to the source amplifier so that the change of the bias power is consistent with the change pattern of the data voltage in the two adjacent frames.

[0071] It should be understood that since the display device displays image data frame by frame, the target data voltage Vsource output by the source amplifier also changes frame by frame, and the bias power supply provided to the source amplifier also changes from the power level of the previous frame to the power level of the current frame. Therefore, this application controls the current supplied to the source amplifier frame by frame through the control sub-circuit 31, so that power consumption control is carried out throughout the entire display process, thereby achieving the purpose of reducing power consumption.

[0072] In one feasible embodiment, the control sub-circuit 31 is also used to control the supply current corresponding to the bias power supply to change in the positive direction of the comparison result.

[0073] In other words, the higher the data voltage corresponding to the frame, the greater the supply current provided by the bias power supply circuit 30. It should be understood that the bias power supply is a power supply device that provides energy to the amplifier output. When the data voltage is large, it means that the source amplifier also needs to provide more energy to amplify the data voltage to the target data voltage Vsource. At this time, with the bias power supply voltage remaining unchanged, a higher supply current needs to be provided to ensure the energy required for the source amplifier to amplify the data voltage.

[0074] In one feasible embodiment, the comparison result may include the magnitude relationship between the first data voltage and the second data voltage, such as a magnitude relationship of greater than [>], less than [<], and equal to [=]. Optionally, the comparison result may also include both the data voltage that meets the condition and the magnitude relationship between the first data voltage and the second data voltage.

[0075] For example, taking the comparison result as a magnitude relationship, when the comparison circuit compares the first data voltage corresponding to the current frame to be greater than the second data voltage corresponding to the previous frame, the comparison result is [>]. At this time, the control sub-circuit controls to increase the supply current provided by the bias power supply according to the comparison result; when the comparison circuit compares the first data voltage corresponding to the current frame to be less than the second data voltage corresponding to the previous frame, the comparison result is [<]. At this time, the control sub-circuit controls to decrease the supply current provided by the bias power supply according to the comparison result; when the comparison circuit compares the first data voltage corresponding to the current frame to be equal to the second data voltage corresponding to the previous frame, the comparison result is [=]. At this time, the control sub-circuit controls to keep the supply current provided by the bias power supply unchanged according to the comparison result.

[0076] In one feasible embodiment, such as Figure 6 As shown, the control sub-circuit 31 can be configured with multiple control levels (Bias). The control sub-circuit 31 can change the conduction control level (Bias) to provide a data voltage that matches the data voltage to the source amplifier.

[0077] It is understandable that multiple control levels can be arranged in the order of change of the supplied power current. For example, taking the increase of the power supply current as an example, the power supply current corresponding to Bias0 is less than the power supply current corresponding to Bias1. Among them, the power supply current corresponding to Biasn is the largest. The control sub-circuit 31 can control the control level to change according to the direction of change of the comparison result.

[0078] For example, taking a comparison result as a magnitude relationship, when the comparison result is [>], the control sub-circuit changes its control position in the direction of increasing current, that is, it closes the current control position and opens other control positions in the direction of increasing current, such as changing from Bias0 to Bias1 or Bias2; when the comparison result is [<], the control sub-circuit changes its control position in the direction of decreasing current, that is, it closes the current control position and opens other control positions in the direction of decreasing current, such as changing from Bias2 to Bias1 or Bias0; when the comparison result is [=], the control sub-circuit's control position remains unchanged.

[0079] In one feasible embodiment, the control sub-circuit 31 is further configured to: acquire a first difference between a first data voltage and a reference voltage and a second difference between a second data voltage and a reference voltage, respectively; and control the amount of change in the bias power supply based on the first difference and the second difference.

[0080] It should be noted that the reference voltage (Band Gap Reference, BGR) is a reference voltage set according to requirements. The reference voltage is used to determine the amount of data voltage variation. Optionally, the reference voltage can be the data voltage corresponding to multiple frames of data on the display device, or it can be the median or middle value of the data voltage variation range corresponding to multiple frames of data. The specific setting can be determined according to the actual needs of the display device, and this application does not impose any specific limitations on it.

[0081] It should be understood that, since the reference voltage is used to determine the amount of change in the data voltage, the first difference obtained based on the first data voltage and the reference voltage represents the first difference in the deviation of the first data voltage from the reference voltage, and the second difference obtained based on the second data voltage and the reference voltage represents the second difference in the deviation of the second data voltage from the reference voltage. The control subunit can determine the amount of change in the bias power supply based on the first difference and the second difference, that is, control the offset power supply to change from the first difference with the reference voltage to the second difference.

[0082] Correspondingly, the control sub-circuit 31 is configured with multiple control levels corresponding to multiple differences. That is, the control sub-circuit 31 can select the direction and number of control levels based on the change in the difference. For example, when the first data voltage is greater than the second data voltage, the control sub-circuit 31 selects the control level along the direction of current increase and at a distance from the corresponding data level for control.

[0083] In one feasible embodiment, the control subcircuit 31 controls the control unit through encoding. Therefore, the number of control levels can be related to the encoding base. For example, when the set change is N bits and the control subcircuit 31 uses binary encoding, the control level can be 2.N indivual.

[0084] For example, taking the reference voltage as the midpoint of the data voltage variation range, any data voltage is offset by at least 0 levels above the reference voltage. Based on this, the control sub-circuit 31 obtains a first difference Δ1 = |Smax1-BGR| based on the difference between the first data voltage Smax1 and the reference voltage BGR. Similarly, it obtains a second difference Δ2 = |Smax2-BGR| based on the difference between the second data voltage Smax2 and the reference voltage BGR. Then, it determines the offset amount of the corresponding control level based on the first difference and the second difference, that is, the number of control levels that deviate from the control level corresponding to the reference voltage, for example, [Δ / 2]. N The control gear is then determined based on the two offset values. Specifically, [Δ1 / 2] is judged. N ] and [Δ2 / 2 N The size relationship between ], if [Δ1 / 2 N ]>[Δ2 / 2 N If the first data voltage requires a larger increase in voltage level than the second data voltage, then the control will change along the direction of increasing current [Δ1 / 2]. N ]-[Δ2 / 2 N ] gears, if [Δ1 / 2 N ]<[Δ2 / 2 N If the first data voltage requires a smaller increase in voltage level than the second data voltage, then the control will change along the direction of decreasing current [Δ2 / 2]. N ]-[Δ2=1 / 2 N ] gears, if if [Δ1 / 2 N ]=[Δ2 / 2 N If the first data voltage needs to be increased by a certain number of gears, it means that the number of gears needed to be increased for the first data voltage is equal to the number of gears needed to be increased for the second data voltage, and the control will not change the control gear.

[0085] In one feasible embodiment, such as Figure 7 As shown, with the voltage provided by the bias power supply remaining constant, i.e., providing a voltage of Level 1, the control level gradually increases in the direction of the arrow, and the supplied current also increases accordingly.

[0086] In one feasible embodiment, such as Figure 2 As shown, the driving circuit 10 also includes multiple driving channels, each used to output channel data voltage. The bias power supply circuit simultaneously provides bias power to the source amplifiers corresponding to multiple driving channels. Therefore, as... Figure 8 As shown, the bias power supply circuit includes a comparator circuit 32.

[0087] The comparator circuit 32 is used to: sequentially compare the channel data voltages output by multiple driving channels, and take the largest channel data voltage as the first data voltage corresponding to the current frame.

[0088] For example, such as Figure 9 As shown, the comparator circuit includes: a first transistor T1 and a second transistor T2.

[0089] The control terminals of the first transistor T1 and the second transistor T2 are connected, and a reference voltage is also connected to them.

[0090] The second terminal of the first transistor T1 is connected to one channel data voltage to be compared, and the second terminal of the second transistor is connected to another channel data voltage to be compared.

[0091] The first terminal of the first transistor T1 is connected to the first terminal of the second transistor T2, and outputs a large channel data voltage.

[0092] It should be noted that the reference voltage can be the reference voltage determined according to the aforementioned method, or it can be the reference voltage set independently for each comparison, that is, any voltage between the data voltages of the two channels to be compared can be selected as the reference voltage, etc. This application does not make any specific limitation.

[0093] In this context, "control terminal" specifically refers to the gate of the transistor, "first terminal" specifically refers to the source of the transistor, and "second terminal" specifically refers to the drain of the transistor. Of course, those skilled in the art should know that the "first terminal" and "second terminal" are interchangeable, that is, the "first terminal" specifically refers to the drain of the transistor, and the "second terminal" specifically refers to the source of the transistor.

[0094] Based on their semiconductor characteristics, transistors can be classified into N-type transistors and P-type transistors. When used as switching transistors, N-type transistors are turned on by a high-level switching signal and turned off by a low-level switching signal; P-type transistors are turned on by a low-level switching signal and turned off by a high-level switching signal.

[0095] In this embodiment, the first transistor T1 can be an N-type transistor, and the second transistor T2 can be a P-type transistor.

[0096] In one feasible embodiment, such as Figure 5 As shown, the bias power supply circuit 30 may further include a storage sub-circuit 33, which is used to store the comparison result of the comparison sub-circuit 32 so that the control sub-circuit 31 can acquire the second data voltage corresponding to the previous frame when performing bias power supply control.

[0097] In one feasible embodiment, the comparator circuit 32 can be configured in multiple stages to sequentially compare the channel data voltages output from multiple channels.

[0098] In a feasible embodiment, the comparison sub-circuit 32 can also be connected to the storage sub-circuit 33 to store the comparison result of each time in the storage sub-circuit 33, and then compare it with the previous comparison result.

[0099] Based on the same inventive concept, such as Figure 10 As shown, this application provides a driving method for a display panel, applied to any of the display panels described above, the method comprising:

[0100] S1001, the driving circuit receives screen data and generates a data voltage based on the screen data.

[0101] S1002, the bias power supply circuit provides a bias power supply to the source amplifier that matches the data voltage.

[0102] S1003, the source amplifier receives the data voltage and outputs the target voltage to the target pixel to be driven.

[0103] This application provides a bias power supply to the source amplifier that matches the data voltage through a bias power supply circuit. This allows the source amplifier to be provided with a suitable bias power supply based on the data voltage corresponding to the image data, avoiding the provision of excessive bias power supply for data voltages that do not require large power consumption, thus avoiding energy waste. This ensures that the source amplifier operates stably in the amplification state while effectively reducing the power consumption of the source amplifier.

[0104] Based on the same inventive concept, this application provides a display device, including a control device for a display panel as described above. In one or more embodiments of this application, the display device can be applied to any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Other essential components of this display device are readily understood by those skilled in the art and will not be described in detail here, nor should they be construed as limiting the invention.

[0105] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0107] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the invention. Terms such as “set” appearing herein can refer to either a component being directly attached to another component or a component being attached to another component via an intermediary. A feature described in one embodiment herein may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0108] The present invention has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the present invention to the described embodiments. Those skilled in the art will understand that many variations and modifications can be made based on the teachings of the present invention, and all such variations and modifications fall within the scope of protection claimed by the present invention.

Claims

1. A display panel, characterized by, The application relates to a driving circuit and a source amplifier. The driving circuit comprises a plurality of driving channels, each of which is used for outputting a channel data voltage. The source amplifier comprises an input end, an output end and a power supply end, the input end of the source amplifier is connected with the driving circuit, the output end of the source amplifier is connected with a target pixel to be driven, the source amplifier is used for receiving the data voltage and outputting a target data voltage to the target pixel to be driven. The bias power supply circuit comprises a comparison sub-circuit, the comparison sub-circuit is used for sequentially comparing the channel data voltages output by the plurality of driving channels, and the maximum channel data voltage is taken as a first data voltage corresponding to a current frame. The bias power supply circuit provides a plurality of bias power supplies corresponding to a plurality of power supply currents.

2. The display panel of claim 1, wherein, The bias power supply circuit comprises a control sub-circuit, and the control sub-circuit is further used for:

3. The display panel of claim 1, wherein, comparing the first data voltage corresponding to the current frame and a second data voltage corresponding to a previous frame to obtain a comparison result; controlling the bias power supply provided for the source amplifier according to the comparison result, so that the variation of the bias power supply is consistent with the variation rule of the data voltages of adjacent two frames. The control sub-circuit is further used for:

4. The display panel of claim 3, wherein, controlling the power supply current corresponding to the bias power supply to change in a positive direction of the comparison result. The control sub-circuit is further used for:

5. The display panel of claim 3, wherein, respectively acquiring a first difference value between the first data voltage and a reference voltage and a second difference value between the second data voltage and the reference voltage; controlling a plurality of control gears to change the variation of the bias power supply according to the first difference value and the second difference value. The comparison sub-circuit comprises a first transistor and a second transistor.

6. The display panel of claim 1, wherein, The gate of the first transistor is connected with the gate of the second transistor, and a reference voltage is connected. The second end of the first transistor is connected with one of the channel data voltages to be compared, and the second end of the second transistor is connected with another of the channel data voltages to be compared. The first end of the first transistor and the first end of the second transistor are connected, and the larger channel data voltage is output. The driving circuit comprises:

7. The display panel of claim 1, wherein, a latch used for latching and outputting a gray scale voltage data corresponding to the picture data and a timing control signal; a level converter connected with the latch and used for performing level conversion on the gray scale voltage data and outputting the same; a gamma voltage generator used for generating a gamma compensation voltage according to the picture data; a digital-to-analog converter connected with the level converter and the gamma voltage generator and used for selecting the corresponding gamma compensation voltage according to the gray scale voltage data and generating the data voltage. The driving circuit receives picture data and generates a data voltage according to the picture data.

8. A driving method of the display panel according to any one of claims 1 to 7, characterized by, ​ ​ A bias power supply circuit provides a bias power supply for the source amplifier, which is consistent with the data voltage; The source amplifier receives the data voltage and outputs a target voltage to the target pixel to be driven.

9. A display device, characterized by comprising: The display panel comprises the display panel as claimed in any one of claims 1-7.

Images