Pre-charging control method and device of display panel, display system and driving method of display system

Abstract

The invention provides a pre-charge control method and apparatus for a display panel, and a display system and a driving method thereof. The pre-charging control method for the display panel comprises the following steps: acquiring the number of data channels to be connected on the display panel during a starting period of a scanning line; based on the number of the to-be-connected data channels, determining a target pre-charging voltage for pre-charging the to-be-connected data channels; and before the to-be-connected data channel is connected, pre-charging the to-be-connected data channel based on the target pre-charging voltage.

Description

[0001] Cross - reference to related applications

[0002] This disclosure claims priority to U.S. Provisional Application No. 63 / 624,766, filed on January 24, 2024, the content of which is incorporated herein by reference in its entirety. Technical field

[0003] This disclosure relates to the field of display technologies, and particularly to a pre - charging control method and device for a display panel, as well as a display system and its driving method. Background art

[0004] It is known that in the display driving of a display panel such as a light - emitting diode (LED) panel, a dynamic driving method is usually adopted. One scan line is sequentially turned on row - by - row to select a row of light - emitting diodes corresponding to the scan line, and the light - emitting diodes are lit by simultaneously supplying a driving current to the data channels corresponding to the light - emitting diodes to be lit / turned on in that row. Among them, the existence of the parasitic capacitor of the light - emitting diode will cause the parasitic capacitor to be pre - charged before a light - emitting diode is lit, so that the voltage across both ends reaches the turn - on voltage of the light - emitting diode before the light - emitting diode can be lit, which will affect the display brightness of the light - emitting diode. For this reason, usually, before the conduction period of the light - emitting diode, a pre - charging circuit is used to pre - charge the parasitic capacitor to slightly lower than the turn - on voltage of the light - emitting diode, so that the light - emitting diode can be quickly lit when the conduction period arrives.

[0005] However, the scan switch for controlling the scan line is not an ideal switch, and it has an equivalent on - resistance when conducting. If a larger number of data channels are simultaneously conducted, the current flowing through the equivalent on - resistance will be larger, and the voltage across the equivalent on - resistance will be higher. This voltage across the equivalent on - resistance will correspondingly raise the cathode potential of the light - emitting diode (in the case where the display panel adopts a common - cathode architecture) or lower the anode potential of the light - emitting diode (in the case where the display panel adopts a common - anode architecture), thus having a greater impact on the actual conduction time of the light - emitting diode.

[0006] Therefore, a solution is needed to reduce the impact of the voltage across the equivalent on - resistance of the scan switch on the conduction time of the light - emitting diode. Summary of the invention

[0007] For this purpose, this disclosure proposes a pre - charging control method and device for a display panel, as well as a display system and its driving method.

[0008] According to one aspect of the present disclosure, a pre-charge control method for a display panel is provided, including: obtaining the number of data channels to be connected on the display panel during the turn-on period of a scan line; determining a target pre-charge voltage for pre-charging the data channels to be connected based on the number of data channels to be connected; and pre-charging the data channels to be connected based on the target pre-charge voltage before connecting the data channels to be connected.

[0009] According to another aspect of the present disclosure, a pre-charge control device for a display panel is provided, including: a component for obtaining the number of data channels to be connected on the display panel during the turn-on period of a scan line; a component for determining a target pre-charge voltage for pre-charging the data channels to be connected based on the number of data channels to be connected; and a component for pre-charging the data channels to be connected based on the target pre-charge voltage before connecting the data channels to be connected.

[0010] According to yet another aspect of the present disclosure, a driving method for a display system is provided, where the display system includes a display panel, the display panel includes a plurality of light-emitting diodes and a plurality of scan lines and a plurality of data channels connected to the plurality of light-emitting diodes, and the driving method includes: turning on a scan line among the plurality of scan lines; in a pre-charge stage, pre-charging the data channels to be connected on the display panel during the turn-on period of the scan line based on a target pre-charge voltage, where the target pre-charge voltage is determined based on the number of data channels to be connected; and, in a display stage, providing corresponding driving currents to the data channels to be connected.

[0011] According to still another aspect of the present disclosure, a display system is provided, including: a display panel, which includes a plurality of light-emitting diodes and a plurality of scan lines and a plurality of data channels connected to the plurality of light-emitting diodes; at least one scan circuit; at least one source driver; and, a timing controller, where the timing controller is configured to: control a scan circuit among the at least one scan circuit to turn on a scan line among the plurality of scan lines; control the at least one source driver to pre-charge the data channels to be connected on the display panel during the turn-on period of the scan line based on a target pre-charge voltage, where the target pre-charge voltage is determined based on the number of data channels to be connected; and, control the at least one source driver to provide corresponding driving currents to the data channels to be connected in a display stage.

[0012] To make the above features and advantages of the present disclosure more obvious and understandable, the following embodiments are listed and described in detail with reference to the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings are used to provide a further understanding of the embodiments of the present disclosure, and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure, and do not constitute a limitation to the present disclosure. In the drawings, the same reference numerals generally represent the same components or steps.

[0014] FIG. 1(a) shows a schematic diagram of an LED display system 100.

[0015] FIG. 1(b) shows a schematic diagram of the current path when the data channel is turned on with the scan line S[1] turned on.

[0016] FIG. 1(c) shows a schematic diagram of an LED display system 100(c).

[0017] Figure 2 A schematic diagram of the signal potential according to the prior art with the scan line S[1] turned on is shown.

[0018] Figure 3 A pre-charge control method 300 for a display panel according to an embodiment of the present disclosure is shown.

[0019] Figure 4 A schematic diagram of the signal potential according to an embodiment of the present disclosure with the scan line S[1] turned on is shown.

[0020] FIG. 5(a) shows a schematic diagram of an LED display system 500-A.

[0021] FIG. 5(b) shows a schematic diagram of another LED display system 500-B. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will describe in detail the embodiments of the present disclosure in conjunction with the drawings and embodiments, so as to fully understand how the present disclosure uses technical means to solve technical problems and achieve the implementation process of technical effects and implement them accordingly. It should be noted that as long as there is no conflict, the various embodiments in the present disclosure and the various features in each embodiment can be combined with each other, and the formed technical solutions are all within the protection scope of the present disclosure.

[0023] Meanwhile, in the following description, many specific details are set forth for the purpose of explanation to provide a thorough understanding of the embodiments of the present disclosure. However, it will be apparent to those skilled in the art that the present disclosure may be practiced without these specific details or in a specific manner described herein. For example, in the following, embodiments of the present disclosure will be mainly described by taking an LED display panel and an LED display system including the same as an example, but it is only an example. Those skilled in the art can understand that the solution proposed by the present disclosure can also be applied to other types of display panels such as Mini-LED and Micro-LED display panels and display systems including the same, which are not limited herein.

[0024] FIG. 1(a) shows a schematic diagram of an LED display system 100, which includes an LED panel 101 adopting a common cathode architecture. In the following, embodiments according to the present disclosure will be mainly described by taking an LED panel adopting a common cathode architecture as an example, but those skilled in the art can understand that the solution proposed by the present disclosure can also be applied to an LED panel adopting a common anode architecture, which is not limited herein.

[0025] As shown in FIG. 1(a), the LED display system 100 includes an LED panel 101, a scanning circuit (also referred to as a gate driver) 102, and a source driver (also referred to as a column driver) 103. The LED panel 101 includes a plurality of light-emitting diodes LED11 to LEDmn, where m and n are positive integers. Each light-emitting diode can correspond to one sub-pixel in a multi-color pixel (for example, an RGB pixel). For example, the light-emitting diodes LED11, LED21, LED31 (not shown) can respectively correspond to the red (R), green (G), and blue (B) sub-pixels in an RGB pixel. The LED panel 101 also includes a plurality of data channels (also referred to as data lines) C[1] to C[m] connecting the anodes of the light-emitting diodes, and a plurality of scanning lines S[1] to S[n] connecting the cathodes of the light-emitting diodes.

[0026] The scanning circuit 102 includes a plurality of scanning switches SW1 - SWn for turning on and off corresponding scanning lines. The source driver 103 includes a plurality of constant current sources (not shown) for driving a plurality of data channels C[1] to C[m]. When performing display driving, the scanning circuit 102 can sequentially turn on one of the plurality of scanning lines S[1] to S[n], thereby selecting a row of light emitting diodes connected to this scanning line. Subsequently, the source driver 103 can turn on some or all of the light emitting diodes in this row of light emitting diodes by providing a driving current to the corresponding data channels. For example, in FIG. 1(a), it is exemplarily shown that the scanning line S[1] is grounded by turning on the scanning switch SW1 to turn on the scanning line S[1], thereby selecting the first row of light emitting diodes LED11 - LEDm1. Subsequently, the source driver 103 can drive some or all of the data channels C[1] - C[m], thereby turning on the corresponding light emitting diodes among the light emitting diodes LED11 - LEDm1.

[0027] As further shown in FIG. 1(a), the plurality of light emitting diodes LED11 to LEDmn also include their respective parasitic capacitors C LED11 ~C LEDmn , and each of these parasitic capacitors is regarded as being connected in parallel with the corresponding light emitting diode. As described above, in order to overcome the influence of these parasitic capacitors on the display brightness of the light emitting diodes, usually, the source driver also includes a plurality of pre - charge circuits (not shown) for pre - charging the parasitic capacitors. These pre - charge circuits can be circuits independent of the constant current sources in the source driver, and can be implemented by various types of adjustable voltage source circuits with adjustable output voltage, as long as they can output a corresponding output voltage based on the input reference voltage to pre - charge the parasitic capacitors, and no limitation is imposed here. When the scanning circuit 102 has turned on a scanning line (for example, scanning line S[1]), but the source driver 103 has not yet driven one or more data channels to turn on the corresponding light emitting diodes, the one or more data channels (that is, the parasitic capacitors of the light emitting diodes connected thereto) can be pre - charged first through the corresponding pre - charge circuits, so that the voltage across the light emitting diodes is close to its turn - on voltage after pre - charging, thereby accelerating the conduction of the light emitting diodes.

[0028] FIG. 1(b) shows a schematic diagram of the current path when the data channel is connected in the case of turning on the scanning line S[1]. Figure 2 A schematic diagram of the signal potential in the case of turning on the scanning line S[1] according to the prior art is shown, where Figure 2The left, middle, and right parts respectively correspond to the cases of only turning on data channel C[1], turning on data channels C[1]-C[2], and turning on all data channels C[1]-C[m], and other data channel turning-on cases are omitted. Next, in combination with Fig. 1(b) and Figure 2 will describe the influence of the voltage on the equivalent on-resistance of the scanning switch to be solved by the present disclosure on the turn-on time of the light-emitting diode. Among them, the more data channels turned on simultaneously, the greater the voltage on the equivalent on-resistance, and the more serious the influence will be.

[0029] As Figure 2 shown, the switch control signal V of the scanning switch SW1 SW1 is at a high level during the turn-on period t1 to control the scanning switch SW1 to turn on, so as to ground the scanning line S[1] to turn on the scanning line S[1]. Correspondingly, the potential V at this scanning line S[1] S[1] (that is, the cathode potential of the light-emitting diode connected to this scanning line S[1]) becomes low after the scanning switch SW1 turns on.

[0030] Subsequently, as described above, before turning on one or more data channels to be turned on, during the pre-charge period t2, the data channels to be turned on can be pre-charged through the pre-charge circuit in the source driver (that is, the parasitic capacitors of the light-emitting diodes connected to the data channels to be turned on are pre-charged), so that the voltage across the corresponding light-emitting diodes is slightly lower than the turn-on voltage of the light-emitting diodes after pre-charging. For example, as Figure 2 shown, in the case where only data channel C[1] is to be turned on, this data channel C[1] is pre-charged during t2 to increase its output voltage V C[1] ; in the case where data channels C[1], C[2] are to be turned on, this data channel C[1], C[2] are pre-charged during t2 to increase its output voltage V C[1] , V C[2] ;...; and so on. As Figure 2 shown, in the prior art, regardless of the number of data channels to be turned on, the data channels to be turned on are pre-charged based on the same pre-charge voltage Upre, so as to charge the output voltage of the data channels to this pre-charge voltage Upre.

[0031] After entering the target conduction period t3 of the light-emitting diode after the pre-charge period t2, during this target conduction period t3, the source driver turns on its internal constant current source to provide a driving current for the data channels to be connected, thereby turning on the corresponding light-emitting diodes. However, since the voltage across the light-emitting diode is still slightly lower than the turn-on voltage of the light-emitting diode after pre-charging, this driving current must first charge the parasitic capacitor of the light-emitting diode, and fully charge the voltage across it to the turn-on voltage of the light-emitting diode before the light-emitting diode can be actually turned on. Correspondingly, as Figure 2 shown, the actual conduction period t3' of the light-emitting diode is shorter than the target conduction period t3, and there is a driving current charging period t4 for charging the parasitic capacitor of the light-emitting diode with the driving current between the pre-charge period t2 and the actual conduction period t3'.

[0032] As shown in FIG. 1(b), since each scanning switch has an equivalent on-resistance when actually turned on (for example, the equivalent on-resistance R1 of the scanning switch SW1 when actually turned on is shown in FIG. 1(b)), if more data channels in the data channels C[1] to C[m] are turned on simultaneously, the current flowing through this equivalent on-resistance is greater (that is, the voltage across this equivalent on-resistance is greater). Correspondingly, the voltage across this equivalent on-resistance will raise the cathode potential of the light-emitting diode higher. Therefore, it takes more time to charge the parasitic capacitor of the light-emitting diode with the driving current on the data channel and raise the anode potential of the light-emitting diode higher before the light-emitting diode can be turned on, which will affect the turn-on time of the light-emitting diode. For example, as Figure 2 schematically shown, as the number of simultaneously turned-on data channels increases, the cathode potential of the light-emitting diode (that is, the potential V at the scanning line S[1]) S[1] ) is raised higher and higher. Correspondingly, the time for charging the parasitic capacitor of the light-emitting diode with the driving current on the data channel (that is, the driving current charging period t4) will be longer and longer, and the actual conduction period t3' of the light-emitting diode will be correspondingly shorter and shorter, thus affecting the display time of the light-emitting diode.

[0033] To solve the above problems, in an embodiment according to the present disclosure, the magnitude of the target pre-charge voltage will be dynamically adjusted according to the number of data channels to be connected, so as to compensate in advance for the influence of the voltage across the equivalent on-resistance of the scanning switch on the turn-on time of the light-emitting diode through the pre-charge process, so that the actual conduction period of the light-emitting diode can be maintained basically unchanged in the case where any number of data channels are to be connected.

[0034] Figure 3The pre - charge control method 300 for a display panel according to an embodiment of the present disclosure is shown. As described above, the display panel can be an LED display panel or other types of display panels such as Mini - LED and Micro - LED display panels.

[0035] As Figure 3 shown, in step S301, the number of data channels to be connected on the display panel during the on - period of a scan line is obtained. Referring again to FIG. 1(a), the scan line can be any one of the scan lines S[1] to S[n] (for example, scan line S[1]). According to specific display requirements, after the scan line is turned on, the source driver can connect a certain number of data channels to turn on the corresponding light - emitting diodes for display. Generally, there is an internal controller inside the source driver, which can learn in advance the number of data channels to be connected and control the driving circuit in the source driver to generate driving control signals for connecting the corresponding data channels. In one example, the number of data channels to be connected on the display panel during the on - period of the scan line can be obtained from the internal controller in the source driver. In other examples, the number of data channels to be connected on the display panel during the on - period of the scan line can also be obtained from other components (for example, an external controller that provides control information including the number of data channels to be connected to the internal controller in the source driver), which is not limited herein.

[0036] In step S302, based on the number of data channels to be connected, a target pre - charge voltage for pre - charging the data channels to be connected is determined.

[0037] In this step, determining a target pre - charge voltage for pre - charging the data channels to be connected based on the number of data channels to be connected may include: determining a voltage adjustment value based on the number of data channels to be connected, and adjusting a preset value of the pre - charge voltage of the data channels to be connected based on the voltage adjustment value to obtain a target pre - charge voltage for pre - charging the data channels to be connected. Wherein, the preset value of the pre - charge voltage can be a fixed value lower than the turn - on voltage of the light - emitting diode. Since the turn - on voltages of light - emitting diodes of different colors are usually different, optionally, the corresponding preset values of the pre - charge voltage can be set according to the turn - on voltages of light - emitting diodes of different colors. For example, assuming that the turn - on voltages of red, green, and blue light - emitting diodes are 1.6V, 2.2V, and 3.5V respectively, the preset values of the pre - charge voltages of the data channels corresponding to the red, green, and blue light - emitting diodes can be, for example, 1V, 2V, and 3V respectively.

[0038] In this step, the voltage adjustment value can be the voltage across the equivalent on-resistance of the scan switch determined or estimated based on the number of data channels to be turned on. Therefore, compared with the prior art that uses a fixed pre-charge voltage, embodiments according to the present disclosure can compensate for the voltage across the equivalent on-resistance of the scan switch by dynamically adjusting the pre-charge voltage, so as to reduce the impact of the voltage across the equivalent on-resistance on the turn-on time of the light-emitting diode. Next, specific examples of determining the voltage adjustment value based on the number of data channels to be turned on according to embodiments of the present disclosure will be described.

[0039] In one example, it can be ideally considered that whenever the number of data channels to be turned on increases by 1, the voltage across the equivalent on-resistance of the scan switch increases by a fixed voltage increment (referred to as the preset voltage increment). Correspondingly, in this example, determining the voltage adjustment value based on the number of data channels to be turned on may include: determining the preset voltage increment corresponding to each data channel in the data channels to be turned on; and determining the voltage adjustment value based on the preset voltage increment corresponding to each data channel and the number of data channels to be turned on. That is to say, the voltage adjustment value can be simply calculated by the product of the preset voltage increment and the number of data channels to be turned on. In this example, the preset voltage increment corresponding to each data channel can be determined based on the product of the rated operating current of the light-emitting diode and the equivalent on-resistance of the scan switch. However, the present disclosure is not limited thereto, and those skilled in the art can also estimate or determine the preset voltage increment by other means.

[0040] As mentioned above, each light-emitting diode can correspond to a sub-pixel in a multi-color pixel (e.g., an RGB pixel). That is to say, the data channels to be turned on connected to these light-emitting diodes can include one or more types of color data channels (e.g., the data channels connected to red / green / blue light-emitting diodes are called red / green / blue data channels). Correspondingly, in this example, the data channels to be turned on of different colors can be distinguished, the preset voltage increment corresponding to a single data channel of each color is determined respectively for the data channels of each color, and the voltage adjustment value is determined based on the number of data channels to be turned on of each color and the preset voltage increment corresponding to a single data channel of that color. That is to say, the number of data channels to be turned on of each color is multiplied by the preset voltage increment corresponding to a single data channel of that color, and finally the obtained products are summed up to obtain the voltage adjustment value.

[0041] In this example, to determine the preset voltage increment corresponding to a single data channel of each color, one can first determine the preset drive current value corresponding to the single data channel of that color, and based on this preset drive current value and the equivalent on-resistance of the scan switch connected to the scan line, determine this preset voltage increment. As mentioned above, the preset drive current value corresponding to a single data channel of each color can be the rated operating current value of the light-emitting diode to which it is connected. However, the present disclosure is not limited thereto, and those skilled in the art can also estimate or determine this preset drive current value by other means.

[0042] Specifically, for example, assuming that the preset drive current values corresponding to single data channels of red, green, and blue are 5 mA, 3 mA, and 2 mA respectively, and the resistance value of the equivalent on-resistance of the scan switch is 200 mΩ, then the preset voltage increments corresponding to single data channels of red, green, and blue can be calculated as 1 mV, 0.6 mV, and 0.4 mV respectively. Table 1 below gives various examples of the voltage adjustment values determined based on the above preset voltage increments and the number of data channels to be turned on for each color.

[0043]

[0044]

[0045] For example, if the numbers of data channels to be turned on for red, green, and blue are 30, 35, and 40 data channels respectively (corresponding to the second-to-last row of Table 1), then the voltage adjustment value can be calculated as 1 mV * 30 + 0.6 mV * 35 + 0.4 mV * 40 = 67 mV.

[0046] Since the magnitude of the driving current in each data channel may vary according to the actual brightness requirement of the light-emitting diode, this will cause the voltage across the equivalent on-resistance of the scan switch to also change. Therefore, in another example, the voltage adjustment value can be more precisely determined based on the actual amount of driving current to be provided to each of the data channels to be turned on. In this example, determining the voltage adjustment value based on the number of data channels to be turned on may include: obtaining the amount of driving current to be provided to each of the data channels to be turned on during the on-period of the scan line; and determining the voltage adjustment value based on the amount of driving current to be provided to each of the data channels to be turned on. Specifically, the amounts of driving current to be provided to each of the data channels to be turned on that are obtained can be summed to determine the total driving current, and this total driving current is equivalent to the total current flowing through the scan switch. After determining this total driving current, the voltage adjustment value can be determined based on this total driving current and the equivalent on-resistance of the scan switch, that is, multiplying this total driving current by the equivalent on-resistance of the scan switch to determine this voltage adjustment value.

[0047] After obtaining the voltage adjustment value in the above manner, the preset pre-charge voltage can be adjusted by it to obtain the target pre-charge voltage. As described above, optionally, the preset pre-charge voltage corresponding to different colors of light-emitting diodes can be determined respectively, so that the preset pre-charge voltage of each color of light-emitting diode can be adjusted based on this voltage adjustment value to obtain its corresponding target pre-charge voltage.

[0048] Finally, in step S303, before turning on the data channels to be turned on, pre-charge the data channels to be turned on based on the target pre-charge voltage.

[0049] In this step, the target pre-charge voltage determined in step S302 can be used as the reference voltage of the pre-charge circuit, so that the pre-charge circuit outputs an output voltage of a corresponding magnitude to pre-charge the parasitic capacitor, so as to pre-charge the anode or cathode voltage of the light-emitting diode to reach this target pre-charge voltage through pre-charging.

[0050] Figure 4 Fig. shows a schematic diagram of signal potentials in the case of turning on scan line S[1] according to an embodiment of the present disclosure.

[0051] As Figure 4 shown, in the case where the LED panel adopts a common cathode architecture, after determining the voltage adjustment value in the above-described manner, the preset pre-charge voltage can be increased by this voltage adjustment value correspondingly to obtain the target pre-charge voltage, so that the anode potential of the light-emitting diode is also raised to this higher target pre-charge voltage during the pre-charge stage (i.e., during the pre-charge period t2). For example, asFigure 4 As shown, as the number of data channels to be connected increases, the target pre-charge voltages U1, U2, U3 for pre-charging the data channels to be connected also become higher and higher. After pre-charging, it only takes a short time (corresponding to the driving current charging period t4) to charge the parasitic capacitor of the light-emitting diode with the driving current to turn it on. Thus, regardless of the number of data channels to be connected, a relatively fixed and short driving current charging period t4 can be maintained, effectively reducing the influence of the rise of the cathode potential of the light-emitting diode on the actual conduction period of the light-emitting diode.

[0052] In another embodiment according to the present disclosure, the LED panel may also adopt a common anode architecture. FIG. 1(c) shows a schematic diagram of an LED display system 100(c), and the LED display system 100(c) includes an LED panel 101(c) adopting a common anode architecture. As shown in FIG. 1(c), the column driver 103(c) is used to drive a plurality of data channels C[1] to C[m] connected to the cathodes of the light-emitting diodes, and the scan circuit 102(c) is used to control the opening and closing of a plurality of scan lines connected to the anodes of the light-emitting diodes. During display driving, the scan circuit 102(c) connects the corresponding scan line to the high level Vh by turning on a scan switch, thereby selecting a row of light-emitting diodes. Subsequently, the column driver 103(c) can drive some or all of the data channels in the data channels C[1] to C[m], thereby turning on the corresponding light-emitting diodes. Among them, the voltage on the equivalent on-resistance of the scan switch will correspondingly affect the anode potential of the light-emitting diode and lower it. Similarly, for the LED panel adopting the common anode architecture, the voltage adjustment value can be determined according to the above-described method, and the target pre-charge voltage can be obtained by correspondingly reducing the pre-charge voltage preset value by this voltage adjustment value, so as to also pull down the cathode potential of the light-emitting diode to a lower target pre-charge voltage during the pre-charge stage. Therefore, according to the embodiments of the present disclosure, the influence of the lowering of the anode potential of the light-emitting diode on the actual conduction period of the light-emitting diode can also be reduced in the case of the LED panel adopting the common anode architecture.

[0053] It should be noted that in addition to the LED display systems including only a single source driver / column driver and a single scan circuit shown in FIGS. 1(a) and 1(c) above, the embodiments according to the present disclosure can also be applied to an LED display system architecture including a plurality of source drivers / column drivers and a plurality of scan circuits.

[0054] FIG. 5(a) shows a schematic diagram of an LED display system 500-A. As schematically shown in FIG. 5(a), the LED display system 500-A includes two source drivers 502 and two scan circuits 503. However, more or fewer source drivers and scan circuits can be used as needed, and no limitation is made here.

[0055] As further shown in FIG. 5(a), the source driver 502 and the scan circuit 503 can be implemented using integrated circuits (ICs). In addition, the same scan lines can be shared between multiple data channels of different source driver ICs (also called column driver ICs). For example, FIG. 5(a) shows that (m + z) data channels C IC1 [1]-C IC1 [m] and C IC2 [1]-C IC2 [z] share (n + y) scan lines S IC1 [1]-S IC1 [n] and S IC2 [1]-S IC2 [y]. In this case, during the acquisition of the on-period of a scan line in step S301, the number of data channels to be turned on on the display panel can include: acquiring the number of data channels to be turned on corresponding to multiple source driver ICs during the on-period of the scan line. That is, the target pre-charge voltage for pre-charging the data channels to be turned on is determined based on the number of data channels to be turned on corresponding to each source driver IC. For example, referring again to FIG. 5(a), assuming the scan line is scan line S IC1 [1], it can be determined the number of data channels to be turned on in the data channels C IC1 [1] corresponding to source driver IC1 and IC2 during the on-period of the scan line S IC1 [1]-C IC1 [m] and C IC2 [1]-C IC2 [z]. Subsequently, the target pre-charge voltage can be determined in the same manner as described above based on the number of data channels to be turned on, and the data channels to be turned on are pre-charged based on the target pre-charge voltage.

[0056] In addition, a timing controller (TCON) 501 for controlling the operations of a plurality of source driver ICs is also shown in FIG. 5(a). For example, the timing controller 501 can be configured to transfer control parameters such as a precharge voltage, the number of data channels to be turned on, and a drive current value, as well as control commands, to the source driver IC1 and IC2 to control operations such as precharging and data channel driving of the source driver IC1 and IC2. Since the timing controller 501 can know the number of data channels to be turned on corresponding to each source driver IC it controls and the magnitude of the drive current to be provided to the data channels to be turned on, thus, in one example, the above-mentioned Figure 4 steps 401-402 can be executed by the timing controller 501 to determine the target precharge voltage. After determining the target precharge voltage, the timing controller 501 can transfer the target precharge voltage to each source driver IC, so that each source driver IC precharges its respective data channels to be turned on based on the target precharge voltage. However, this is only an example. In another example, the timing controller 501 can transfer the number of data channels to be turned on corresponding to each source driver IC it knows (and the magnitude of the drive current to be provided to each data channel among the data channels to be turned on) to each source driver IC, and they can each determine the target precharge voltage and then perform the precharging operation correspondingly.

[0057] It should be noted that the architecture of the LED display system 500-A shown in FIG. 5(a) above is only an example. FIG. 5(b) shows a schematic diagram of another LED display system 500-B. Compared with FIG. 5(a), in order to improve the scanning ability, in addition to the scanning circuit IC1 and IC2 on the left side of the display panel, there are also scanning circuit IC3 and IC4 on the right side of the display panel in FIG. 5(b), so that the opening and closing of each row of scanning lines can be jointly controlled by the two scanning circuits on the left and right sides.

[0058] In this case, when the corresponding scanning switches in the two scanning circuits on the left and right sides are turned on to open a row of scanning lines (for example, FIG. 5(b) shows that the corresponding scanning switches in the scanning circuits IC1 and IC3 on the left and right sides are turned on to open the first row of scanning line S IC1 [1]), the equivalent on-resistances of the corresponding scanning switches in the two scanning circuits are equivalent to being connected in parallel. Correspondingly, in this embodiment, when determining the voltage adjustment value by using the equivalent on-resistance of the scanning switch, the voltage adjustment value can be determined based on the equivalent resistance value of the parallel connection of the equivalent on-resistances of the corresponding scanning switches in the two scanning circuits.

[0059] In summary, the method according to an embodiment of the present disclosure dynamically adjusts a target pre-charge voltage based on the number of data channels to be connected, and can compensate in advance for the influence of the voltage on the equivalent on-resistance of the scan switch on the turn-on time of the light-emitting diode during the pre-charge stage, thereby ensuring the display time of the light-emitting diode.

[0060] Next, a pre-charge control device for a display panel according to an embodiment of the present disclosure is described, including: a component for obtaining the number of data channels to be connected on the display panel during the turn-on period of a scan line; a component for determining a target pre-charge voltage for pre-charging the data channels to be connected based on the number of data channels to be connected; and a component for pre-charging the data channels to be connected based on the target pre-charge voltage before connecting the data channels to be connected.

[0061] According to other aspects of the present disclosure, the pre-charge control device may further include a component for performing other methods described according to the embodiments of the present disclosure.

[0062] In addition, a driving method for a display system according to an embodiment of the present disclosure is described, where the display system includes a display panel, the display panel includes a plurality of light-emitting diodes and a plurality of scan lines and a plurality of data channels connected to the plurality of light-emitting diodes, and the driving method includes: turning on a scan line among the plurality of scan lines; during a pre-charge stage, pre-charging the data channels to be connected on the display panel during the turn-on period of the scan line based on a target pre-charge voltage, where the target pre-charge voltage is determined based on the number of data channels to be connected; and, during a display stage, providing a corresponding driving current to the data channels to be connected.

[0063] According to other aspects of the present disclosure, the driving method for the display system further includes pre-discharging one or more of the plurality of data channels during a pre-discharge stage before the pre-charge stage.

[0064] According to other aspects of the present disclosure, the display system includes a plurality of source driver integrated circuits, and wherein the target pre-charge voltage is determined based on the number of data channels to be connected corresponding to each source driver integrated circuit.

[0065] According to other aspects of the present disclosure, the display panel is any one of an LED, Mini-LED, and Micro-LED display panel.

[0066] Next, a display system according to an embodiment of the present disclosure is described, including: a display panel including a plurality of light-emitting diodes, a plurality of scan lines, and a plurality of data channels connected to the plurality of light-emitting diodes; at least one scan circuit; at least one source driver; and a timing controller, where the timing controller is configured to: control a scan circuit in the at least one scan circuit to turn on one of the plurality of scan lines; control the at least one source driver to pre-charge, during an on-period of the scan line, data channels to be turned on on the display panel based on a target pre-charge voltage during a pre-charge phase, where the target pre-charge voltage is determined based on the number of data channels to be turned on; and control the at least one source driver to provide corresponding drive currents to the data channels to be turned on during a display phase. Wherein, the timing controller may be, for example, the timing controller 501 described above with reference to FIG. 5(a).

[0067] According to other aspects of the present disclosure, the at least one source driver is a plurality of source driver integrated circuits, and the target pre-charge voltage is determined based on the number of data channels to be turned on corresponding to each source driver integrated circuit.

[0068] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. It should be noted that the advantages, benefits, effects, etc. mentioned in the embodiments of the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present disclosure. In addition, the above-disclosed specific details are only for the purpose of illustration and easy understanding, rather than limitations, and the above details do not limit the present disclosure to necessarily adopt the above specific details to be implemented. It should also be noted that in the apparatus and methods of the present disclosure, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present disclosure.

[0069] For ordinary operators in the art, all or any part of the methods and devices of the present disclosure can be implemented in any computing device (including processors, storage media, etc.) or a network of computing devices in hardware, firmware, software, or any combination thereof. The hardware can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array signal (FPGA), or other programmable logic devices (PLDs), discrete gate or transistor logic, discrete hardware components, or any combination thereof that are designed to perform the functions described herein. The general-purpose processor can be a microprocessor, but alternatively, the processor can be any commercially available processor, controller, microcontroller, or state machine. The processor can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration. The software can exist in any form of tangible computer-readable storage medium. By way of example and not limitation, such a tangible computer-readable storage medium can include RAM, ROM, EEPROM, CD-ROM, or other optical disk storage, magnetic disk storage, or other magnetic storage devices, or any other tangible medium that can be used to carry or store the desired program code in the form of instructions or data structures and that can be accessed by a computer. As used herein, a disk includes a compact disk (CD), a laser disk, an optical disk, a digital versatile disk (DVD), a floppy disk, and a Blu-ray disk.

[0070] The block diagrams of the elements, components, devices, apparatuses, and systems involved in the embodiments of the present disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these elements, components, devices, apparatuses, and systems can be connected, arranged, and configured in any manner.

[0071] In addition, the scope of the present disclosure claimed is not limited to the specific aspects of the processes, machines, manufactures, compositions of events, means, methods, and acts described above. Current or later-developed processes, machines, manufactures, compositions of events, means, methods, or acts that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized.

[0072] Furthermore, words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably therewith. The words "or" and "and" as used herein refer to the phrase "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" as used herein refers to the phrase "such as but not limited to" and can be used interchangeably therewith.

[0073] The foregoing description of the disclosed aspects is provided to enable any operator in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pre-charge control method for a display panel, comprising: Obtaining the number of data channels to be connected on the display panel during the on-period of a scanning line; Determining a target pre-charge voltage for pre-charging the data channels to be connected based on the number of data channels to be connected; And Before connecting the data channels to be connected, pre-charging the data channels to be connected based on the target pre-charge voltage.

2. The pre-charging control method according to claim 1, wherein, Determining a target pre-charge voltage for pre-charging the data channels to be connected based on the number of data channels to be connected includes: Determining a voltage adjustment value based on the number of data channels to be connected; and Adjusting a preset value of the pre-charge voltage of the data channels to be connected based on the voltage adjustment value to obtain the target pre-charge voltage for pre-charging the data channels to be connected.

3. The pre-charge control method according to claim 2, wherein, Determining a voltage adjustment value based on the number of data channels to be connected includes: Determining a preset voltage increment corresponding to each data channel among the data channels to be connected; and Determining the voltage adjustment value based on the preset voltage increment corresponding to each data channel and the number of data channels to be connected.

4. The pre-charge control method according to claim 3, wherein, The data channels to be connected include data channels of one or more colors, and Determining a preset voltage increment corresponding to each data channel among the data channels to be connected includes: for each color of data channels, determining a preset voltage increment corresponding to a single data channel of that color; and Determining the voltage adjustment value based on the preset voltage increment corresponding to each data channel and the number of data channels to be connected includes: determining the voltage adjustment value based on the number of data channels of each color to be connected and the preset voltage increment corresponding to a single data channel of that color.

5. The pre-charge control method according to claim 4, wherein, For each color of data channels, determining a preset voltage increment corresponding to a single data channel of that color includes: Determining a preset drive current value corresponding to a single data channel of that color; and Determining a preset voltage increment corresponding to a single data channel of that color based on the preset drive current value and the equivalent on-resistance of a scan switch connected to the scanning line.

6. The pre-charge control method according to claim 2, wherein, Determining a voltage adjustment value based on the number of data channels to be connected includes: Obtaining the amount of drive current to be provided to each data channel among the data channels to be connected during the on-period of the scanning line; and Determining the voltage adjustment value based on the amount of drive current to be provided to each data channel among the data channels to be connected.

7. The pre-charge control method according to claim 6, wherein, Determining the voltage adjustment value based on the amount of drive current to be provided to each data channel among the data channels to be connected includes: Determining a total drive current based on the amount of drive current to be provided to each data channel among the data channels to be connected; and Determining the voltage adjustment value based on the total drive current and the equivalent on-resistance of a scan switch connected to the scanning line.

8. The pre-charge control method according to claim 1, wherein, Obtaining the number of data channels to be connected on the display panel during the on-period of the scanning line includes: Obtain the number of data channels to be turned on on the display panel during the on-period of a scan line from an internal controller of the source driver or a controller external to the source driver.

9. The pre-charge control method according to claim 2, wherein The display panel adopts a common cathode architecture, and increases a preset pre-charge voltage value based on the voltage adjustment value to obtain the target pre-charge voltage.

10. The pre-charge control method according to claim 2, wherein, The display panel adopts a common anode architecture, and decreases a preset pre-charge voltage value based on the voltage adjustment value to obtain the target pre-charge voltage.

11. The pre-charge control method according to claim 1, wherein, The display panel is any one of an LED, Mini-LED, and Micro-LED display panel.

12. A pre-charge control device for a display panel, comprising: A component for obtaining the number of data channels to be turned on on the display panel during the on-period of a scan line; A component for determining a target pre-charge voltage for pre-charging the data channels to be turned on based on the number of data channels to be turned on; and And A component for pre-charging the data channels to be turned on based on the target pre-charge voltage before turning on the data channels to be turned on.

13. A driving method for a display system, wherein the display system includes a display panel, the display panel includes a plurality of light-emitting diodes and a plurality of scan lines and a plurality of data channels connected to the plurality of light-emitting diodes, and the driving method includes: Turn on a scan line among the plurality of scan lines; In a pre-charge stage, pre-charge the data channels to be turned on on the display panel during the on-period of the scan line based on a target pre-charge voltage, wherein the target pre-charge voltage is determined based on the number of data channels to be turned on; and In a display stage, provide corresponding drive currents to the data channels to be turned on.

14. The method according to claim 13, further comprising: Pre-discharge one or more of the plurality of data channels in a pre-discharge stage before the pre-charge stage.

15. The method according to claim 13, wherein, The display system includes a plurality of source driver integrated circuits, and wherein The target pre-charge voltage is determined based on the number of data channels to be turned on corresponding to each source driver integrated circuit.

16. The pre-charge control method according to claim 13, wherein, The display panel is any one of an LED, Mini-LED, and Micro-LED display panel.

17. A display system, comprising: A display panel, which includes a plurality of light-emitting diodes and a plurality of scan lines and a plurality of data channels connected to the plurality of light-emitting diodes; At least one scan circuit; At least one source driver; and A timing controller, wherein the timing controller is configured to: Control a scan circuit in the at least one scan circuit to turn on a scan line among the plurality of scan lines; Control the at least one source driver to pre-charge the data channels to be turned on on the display panel during the on-period of the scan line based on a target pre-charge voltage in a pre-charge stage, wherein the target pre-charge voltage is determined based on the number of data channels to be turned on; and Control the at least one source driver to provide a corresponding driving current to the data channel to be turned on during the display phase.

18. The display system according to claim 17, wherein, The at least one source driver is a plurality of source driver integrated circuits, and the target precharge voltage is determined based on the number of data channels to be turned on corresponding to each source driver integrated circuit.

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