Display driver, driving method thereof and display device

Abstract

The invention discloses a display driver, a driving method thereof and a display device, and belongs to the technical field of display. In a channel included in the display driver, a latch module is used for latching a first data signal to obtain a second data signal, and the second data signal comprises a first pre-charging signal and a first effective signal; the latch module is also used for latching a first effective signal included in the second data signal to obtain a second effective signal; the first switch module is used for obtaining a first driving signal according to the second data signal, the second effective signal and the first control signal, the first driving signal is used for driving pixels included in the display panel to be pre-charged, and the first driving signal comprises a second pre-charging signal and a third effective signal which are alternate. Pre-charging is achieved through the first data signals, the first data signals can provide a large number of levels, and the selectable pre-charging levels are large when the driving pixels are pre-charged.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display driver and a driving method thereof, and a display device. Background Art

[0002] In the field of display technology, a display device includes a display driver and a display panel provided with a plurality of pixels. The display driver is coupled to the plurality of pixels and is used to drive the plurality of pixels to emit light. When the display driver operates in a pre-charging mode, the display driver can drive the pixels to pre-charge so that the pixels are quickly lit to a desired brightness, thereby increasing the driving speed. Among them, how the display driver drives the pixels to pre-charge has become a problem worthy of attention. Summary of the invention

[0003] The embodiment of the present application provides a display driver and a driving method thereof, and a display device, which can be used to drive pixels for pre-charging and improve the driving speed. The technical solution provided by the embodiment of the present application includes the following aspects.

[0004] In a first aspect, a display driver for a display panel is provided, the display driver comprising at least one channel, each channel comprising: a latch module, for latching a first data signal to obtain a second data signal, the second data signal comprising a first pre-charge signal and a first valid signal; the latch module, for latching the first valid signal included in the second data signal to obtain a second valid signal; the first switch module, for acquiring a first drive signal according to the second data signal, the second valid signal and a first control signal, the first drive signal being used to drive pixels included in the display panel to perform pre-charge, the first drive signal comprising alternating second pre-charge signals and third valid signals.

[0005] Exemplarily, the latch module includes a first latch and a second latch, the first latch includes a first input terminal, a first output terminal and a second output terminal, the second latch includes a second input terminal and a third output terminal, and the first switch module is a first switch including a third input terminal, a fourth input terminal, a first control terminal and a fourth output terminal; the first latch is used to latch the first data signal provided by the first input terminal, obtain the second data signal, output the second data signal to the second latch through the first output terminal, and output the second data signal to the first switch through the second output terminal; the second latch is used to receive the second data signal through the second input terminal, latch the first valid signal included in the second data signal, obtain and output the second valid signal to the first switch through the third output terminal; the first switch is used to receive the second data signal through the third input terminal, receive the second valid signal through the fourth input terminal, and control the fourth output terminal to be alternately connected with the third input terminal or the fourth input terminal according to the first control signal provided by the first control terminal, so as to obtain and output the first drive signal through the fourth output terminal.

[0006] Exemplarily, the first pre-charge signal occupies N bits, and the level that drives the pixel for pre-charging is a level among a reference number of levels corresponding to the value of the first pre-charge signal, the reference number is 2 to the power of N, and N is a positive integer greater than or equal to 1.

[0007] Exemplarily, the period during which the pixel is driven to perform pre-charging is within a period during which the pixel is in a high impedance state.

[0008] Exemplarily, the display driver includes at least two channels, and the at least two channels correspond one-to-one to at least two first drive signals. The display driver also includes: a second switch module, which is used to obtain a first drive signal from the at least two first drive signals according to a second control signal, and obtain a second drive signal according to the obtained first drive signal, and the second drive signal is used to drive the pixel for pre-charging.

[0009] Exemplarily, the second switch module is a second switch including a second control terminal, at least two fifth input terminals and a fifth output terminal, the fifth output terminal is coupled to the pixel, and the at least two fifth input terminals are coupled to the at least two channels in a one-to-one correspondence; the second switch is used to control the fifth output terminal to be connected to one of the at least two fifth input terminals according to the second control signal provided by the second control terminal, and to obtain the second drive signal according to the first drive signal corresponding to the connected fifth input terminal, and output the second drive signal through the fifth output terminal to drive the pixel to pre-charge.

[0010] In a second aspect, a driving method of a display driver is provided, the driving method being applied to the display driver provided in the first aspect or any exemplary embodiment of the first aspect, the display driver comprising at least one channel, each channel comprising a latch module and a first switch module, the driving method comprising: latching a first data signal through the latch module to obtain a second data signal, the second data signal comprising a first pre-charge signal and a first valid signal; latching the first valid signal included in the second data signal through the latch module to obtain a second valid signal; acquiring a first drive signal through the first switch module according to the second data signal, the second valid signal and a first control signal, the first drive signal being used to drive pixels included in the display panel to perform pre-charge, the first drive signal comprising alternating second pre-charge signals and third valid signals.

[0011] Exemplarily, the latch module includes a first latch and a second latch, the first latch includes a first input terminal, a first output terminal and a second output terminal, the second latch includes a second input terminal and a third output terminal, and the first switch module is a first switch including a third input terminal, a fourth input terminal, a first control terminal and a fourth output terminal; the latching of the first data signal by the latch module to obtain the second data signal includes: latching the first data signal provided by the first input terminal by the first latch to obtain the second data signal, outputting the second data signal to the second latch through the first output terminal, and outputting the second data signal to the first switch through the second output terminal; the latching of the second data signal by the latch module includes the first data signal provided by the first input terminal A valid signal is obtained, and a second valid signal is obtained, including: receiving the second data signal through the second input terminal through the second latch, latching the first valid signal included in the second data signal, obtaining and outputting the second valid signal to the first switch through the third output terminal; the first switch module obtains the first drive signal according to the second data signal, the second valid signal and the first control signal, including: receiving the second data signal through the third input terminal through the first switch, receiving the second valid signal through the fourth input terminal, and controlling the fourth output terminal to be alternately connected with the third input terminal or the fourth input terminal according to the first control signal provided by the first control terminal, so as to obtain and output the first drive signal through the fourth output terminal.

[0012] Exemplarily, the first pre-charge signal occupies N bits, and the level that drives the pixel for pre-charging is a level among a reference number of levels corresponding to the value of the first pre-charge signal, the reference number is 2 to the power of N, and N is a positive integer greater than or equal to 1.

[0013] Exemplarily, the period during which the pixel is driven to perform pre-charging is within a period during which the pixel is in a high impedance state.

[0014] Exemplarily, the display driver includes at least two channels, and the at least two channels correspond one-to-one to at least two first drive signals. The display driver also includes a second switch module, and the driving method also includes: obtaining a first drive signal from the at least two first drive signals according to a second control signal through the second switch module, and obtaining a second drive signal according to the obtained first drive signal, wherein the second drive signal is used to drive the pixel for pre-charging.

[0015] Exemplarily, the second switch module is a second switch including a second control terminal, at least two fifth input terminals and a fifth output terminal, the fifth output terminal is coupled to the pixel, and the at least two fifth input terminals are coupled to the at least two channels in a one-to-one correspondence; the second switch module obtains a first drive signal from the at least two first drive signals according to the second control signal, and obtains a second drive signal according to the obtained first drive signal, including: controlling the fifth output terminal to be connected to one of the at least two fifth input terminals according to the second control signal provided by the second control terminal through the second switch, and obtaining the second drive signal according to the first drive signal corresponding to the connected fifth input terminal, and outputting the second drive signal through the fifth output terminal to drive the pixel to pre-charge.

[0016] According to a third aspect, a display device is provided, comprising a display panel and a display driver provided by the first aspect or any exemplary embodiment of the first aspect, wherein the display driver is coupled to pixels included in the display panel to drive the pixels.

[0017] The technical solution provided by the embodiments of the present application includes at least the following technical effects.

[0018] The embodiment of the present application does not need to set a pre-charge power supply, and the function of the pre-charge power supply is replaced by the first data signal. Compared with a pre-charge power supply that can only provide one pre-charge level, the first data signal can provide a larger number of levels, so that more pre-charge levels can be selected when driving the pixel for pre-charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a structural schematic diagram of a display panel provided in an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of the structure of a display driver in a related technology provided by an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of the structure of a display driver provided in an embodiment of the present application;

[0023] Figure 4 is a schematic diagram of the structure of another display driver provided in an embodiment of the present application;

[0024] Figure 5 is a structural diagram of another display driver provided in an embodiment of the present application;

[0025] Figure 6 is a timing diagram of a display driver in a pre-charging mode provided by an embodiment of the present application;

[0026] Figure 7 is a structural diagram of another display driver provided in an embodiment of the present application;

[0027] Figure 8 is a structural diagram of another display driver provided in an embodiment of the present application;

[0028] Fig. 9 is a structural diagram of another display driver provided in an embodiment of the present application;

[0029] Fig.10 is a timing diagram of a display driver not in a pre-charging mode provided by an embodiment of the present application;

[0030] Fig.11 is a flow chart of a driving method of a display driver provided in an embodiment of the present application;

[0031] Fig.12 It is a structural schematic diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0033] A display device is a device that can display images and other contents. The display device includes a display driver and a display panel. The display driver can be applied to Figure 1 In the display panel 10 shown. Figure 1 The display panel 10 includes a plurality of pixels P1. In an exemplary embodiment, the display driver includes but is not limited to: a display driver integrated (DDI) circuit or a touch and display driver integrated (TDDI) circuit.

[0034] See also Figure 2 , Figure 2The display driver in the related art is shown. The devices in the display driver include: a first (1st) latch, a second (2nd) latch, a level shifter (L / S), a PDAC, an N DAC, a high voltage amplifier (VH Amp), a low voltage amplifier (VL Amp), a precharge transistor and a multiplexer (MUX). The connection relationship of each device can be seen in Figure 2 .

[0035] The pre-charge transistor includes a high voltage (HV) transistor or a middle voltage (MV) transistor, the working voltage of the high voltage transistor is about 32 volts (V), and the working voltage of the middle voltage transistor is about 8V, and the multiplexer is, for example, an MV MUX. P represents P-metal-oxide-semiconductor (PMOS), N represents N-metal-oxide-semiconductor (NMOS), P DAC refers to a digital to analog converter (DAC) including PMOS, and N DAC refers to a DAC including NMOS.

[0036] The 1st latch latches the valid data signal according to the 1st enable signal to obtain the first signal, and outputs the first signal to the 2nd latch. The 2nd latch latches the first signal according to the 2nd enable signal to obtain the second signal. The L / S, P DAC and VH Amp (or L / S, N DAC and VL Amp) process the second signal in sequence to obtain a processed signal.

[0037] On the one hand, the pre-charge transistor receives the processed signal. On the other hand, the pre-charge transistor is connected to the pre-charge power supply, and the pre-charge transistor also receives the power signal output by the pre-charge power supply, and the power signal can be a voltage signal with a certain value. The pre-charge transistor drives the pixel to pre-charge according to the processed signal and the power signal. For example, the pixels of the odd columns in the display panel are driven by MUX. For another example, the pixels of the even columns in the display panel are driven by MUX.

[0038] However, the pre-charge level corresponding to the power signal provided by the pre-charge power supply is relatively limited. For example, if the pre-charge power supply can provide a voltage signal with a fixed value, it only corresponds to one pre-charge level, which results in a limited number of pre-charge levels that can be selected by the pre-charge transistor when driving the pixel for pre-charging. If you want to increase the selectable pre-charge levels, you need to increase the number of pre-charge power supplies, which not only introduces additional costs, but also increases the size of the display driver.

[0039] In addition, in the related art, HV transistors or MV transistors are used as pre-charging transistors, which results in a larger size of the pre-charging transistor, thereby resulting in a larger size of the display driver, increasing the cost of the display driver and reducing the applicability of the display driver.

[0040] In this regard, an embodiment of the present application provides a display driver applied to a display panel, the display driver comprising at least one channel. Optionally, each channel corresponds to a column of pixels P1 in the display panel 10. Figure 3 As shown, each channel includes a latch module and a first switch module.

[0041] A latch module is used to latch a first data signal to obtain a second data signal, wherein the second data signal includes a first pre-charge signal and a first valid signal. The latch module is also used to latch the first valid signal included in the second data signal to obtain a second valid signal. A first switch module is used to obtain a first drive signal according to the second data signal, the second valid signal and the first control signal, wherein the first drive signal is used to drive the pixels included in the display panel to perform pre-charge, and the first drive signal includes an alternating second pre-charge signal and a third valid signal. In the first drive signal, the third valid signal is used to drive the pixels to display content normally, and the second pre-charge signal is used to drive the pixels to perform pre-charge, so that the pixels are quickly lit to a desired brightness without affecting the normal display of content, thereby increasing the driving speed.

[0042] In an exemplary embodiment, if Figure 4 As shown, the latch module includes a first latch 1 and a second latch 2, the first latch 1 includes a first input terminal 11, a first output terminal 12 and a second output terminal 13, the second latch 2 includes a second input terminal 21 and a third output terminal 22, and the first switch module is a first switch 3 including a third input terminal 32, a fourth input terminal 33, a first control terminal 31 and a fourth output terminal 34. Based on this, each channel includes a first latch 1, a second latch 2 and a first switch 3.

[0043] The first latch 1 is used to latch the first data signal provided by the first input terminal 11 to obtain the second data signal, output the second data signal to the second latch 2 through the first output terminal 12, and output the second data signal to the first switch 3 through the second output terminal 13. The second data signal includes a first pre-charge signal and a first valid signal. In other words, the first latch 1 includes a first input terminal 11, a first output terminal 12, and a second output terminal 13. The first latch 1 latches the first data signal to obtain a second data signal including a first pre-charge signal and a first valid signal. The first latch 1 can output the second data signal to the second latch 2 and the first switch 3 respectively through the first output terminal 12 and the second output terminal 13.

[0044] Alternatively, see Figure 5 The first latch 1 also includes a first enable terminal 14, which provides a first enable signal. The first latch 1 latches the first data signal provided by the first input terminal 11 according to the first enable signal to obtain the above-mentioned second data signal.

[0045] See also Figure 6 , the first data signal includes a valid data signal and a pre-charge data signal. The valid data signal is a signal for displaying content, for example, the valid data signal includes display data such as red green blue (RGB) data. The pre-charge data signal is a signal for pre-charging. The valid data signal and the pre-charge data signal can be alternated with each other. That is, the first data signal includes: one or more segments of valid data signals, and one or more segments of pre-charge data signals. When there are multiple segments of valid data signals, pre-charge data signals can be included between valid data signals of different segments. When there are multiple segments of pre-charge data signals, valid data signals can be included between pre-charge data signals of different segments.

[0046] Based on this, the first latch 1 latches the precharge data signal included in the first data signal according to the first enable signal to obtain the first precharge signal. The first latch 1 also latches the valid data signal included in the first data signal according to the first enable signal to obtain the first valid signal. According to the above description, the second data signal includes the first precharge signal and the first valid signal. Therefore, the first latch 1 latches the first data signal provided by the first input terminal 11 according to the first enable signal to obtain the second data signal.

[0047] The state of the first latch 1 includes an enabled state and a latched state. When the first latch 1 is in the enabled state, the output of the first latch 1 can change with the input of the first latch 1. After the first latch 1 enters the latched state from the enabled state, the output of the first latch 1 no longer changes with the input of the first latch 1. In other words, the output of the first latch 1 after entering the latched state remains the same as the output of the first latch 1 when entering the latched state.

[0048] Combination Figure 6 The first enable signal shown in the figure represents an enable state when the first enable signal is protruding, and represents a latched state when the first enable signal is not protruding. Therefore, the first latch 1 enters the enable state at the rising edge of the first protrusion, and enters the latched state at the falling edge of the first protrusion, thereby latching the valid data signal included in the first data signal to obtain the first valid signal. The first latch 1 enters the enable state at the rising edge of the second protrusion, and enters the latched state at the falling edge of the second protrusion, thereby latching the pre-charge data signal included in the first data signal to obtain the first pre-charge signal. The other protrusions in the first enable signal are similar, and will not be repeated here one by one.

[0049] After obtaining the second data signal, the first latch 1 outputs the second data signal to the second latch 2 through the first output terminal 12, and the first latch 1 outputs the second data signal to the first switch 3 through the second output terminal 13, as described below.

[0050] The second latch 2 is used to receive the second data signal through the second input terminal 21, latch the first valid signal included in the second data signal, obtain and output the second valid signal to the first switch through the third output terminal 22. That is, the second latch 2 includes the second input terminal 21 and the third output terminal 22, the second input terminal 21 is coupled to the first output terminal 12, and the second latch 2 is used to latch the first valid signal, obtain and output the second valid signal through the third output terminal 22.

[0051] Among them, since the second input terminal 21 is coupled to the first output terminal 12, after the first latch 1 outputs the second data signal through the first output terminal 12, the second input terminal 21 can provide the second data signal to the second latch 2, that is, the second latch 2 receives the second data signal through the second input terminal 21. According to the above description, the second data signal includes a first pre-charge signal and a first valid signal.

[0052] Alternatively, see Figure 5 The second latch 2 may further include a second enable terminal 23, the second enable terminal 23 provides a second enable signal, and the second latch 2 latches the first valid signal included in the second data signal provided by the second input terminal 21 according to the second enable signal, to obtain Figure 6 The second valid signal is shown.

[0053] Among them, the state of the second latch 2 includes an enabled state and a latched state. When the second latch 2 is in the enabled state, the output of the second latch 2 can change with the input of the second latch 2. After the second latch 2 enters the latched state from the enabled state, the output of the second latch 2 no longer changes with the input of the second latch 2. In other words, the output of the second latch 2 after entering the latched state remains the same as the output of the second latch 2 when entering the latched state.

[0054] Combination Figure 6 The second enable signal shown in FIG. 1 represents an enable state when the second enable signal is raised, and represents a latched state when the second enable signal is not raised. Therefore, the second latch 2 enters the enable state at the rising edge of the first protrusion, and enters the latched state at the falling edge of the first protrusion, thereby latching the first valid signal included in the second data signal to obtain the second valid signal. The other protrusions in the second enable signal are similar, and will not be described one by one here.

[0055] After obtaining the second valid signal, the second latch 2 outputs the second valid signal to the first switch 3 through the third output terminal 22 .

[0056] The first switch 3 is used to receive the second data signal through the third input terminal 32, receive the second valid signal through the fourth input terminal 33, and control the fourth output terminal 34 to be alternately connected with the third input terminal 32 or the fourth input terminal 33 according to the first control signal provided by the first control terminal 31, so as to obtain and output the first driving signal through the fourth output terminal 34. That is, the first switch 3 comprises the first control terminal 31, the third input terminal 32, the fourth input terminal 33 and the fourth output terminal 34, and the fourth output terminal 34 is coupled to the pixels included in the display panel.

[0057] On the one hand, since the third input terminal 32 is coupled to the second output terminal 13, after the first latch 1 outputs the second data signal through the second output terminal 13, the third input terminal 32 can provide the second data signal to the first switch 3, that is, the first switch 3 receives the second data signal through the third input terminal 32, and the second data signal includes a first pre-charge signal and a first valid signal.

[0058] On the other hand, since the fourth input terminal 33 is coupled to the third output terminal 22, after the second latch 2 outputs the second valid signal through the third output terminal 22, the fourth input terminal 33 can provide the second valid signal to the first switch 3, that is, the first switch 3 receives the second valid signal through the fourth input terminal 33.

[0059] According to the above two aspects of description, it can be known that the first switch 3 can receive the second data signal from the first latch 1 and can also receive the second valid signal from the second latch 2 .

[0060] Based on this, the first switch 3 is used to control the fourth output terminal 34 to be alternately connected with the third input terminal 32 or the fourth input terminal 33 according to the first control signal provided by the first control terminal 31, and obtain and output the first drive signal through the fourth output terminal 34, and the first drive signal includes an alternate second pre-charge signal and a third effective signal. Among them, since the fourth output terminal 34 is coupled to the pixel included in the display panel, after the first switch 3 outputs the first drive signal through the fourth output terminal 34, the first drive signal can be used to drive the pixel to pre-charge, so that the pixel is quickly lit to the required brightness, thereby improving the driving speed.

[0061] Next, combine Figure 6 , the reason why the first driving signal includes the alternating second pre-charge signal and the third valid signal is explained. Figure 6 The first driving signal shown, wherein the box marked with "precharge" represents the second precharge signal, and the blank box without marking represents the third valid signal.

[0062] When the first switch 3 controls the fourth output terminal 34 to be connected to the third input terminal 32 according to the first control signal, the first driving signal output by the fourth output terminal 34 includes a second pre-charge signal, and the second pre-charge signal is obtained based on the first pre-charge signal included in the second data signal received through the third input terminal 32. For example, see Figure 6 , in the first time period corresponding to the first pre-charge signal, the first control signal is a control signal of the first level (corresponding to Figure 6 The first switch 3 controls the fourth output terminal 34 to be connected to the third input terminal 32 according to the control signal of the first level, so that part or all of the first pre-charge signal serves as the above-mentioned second pre-charge signal, so that the first drive signal output through the fourth output terminal 34 includes the second pre-charge signal.

[0063] When the first switch 3 controls the fourth output terminal 34 to be connected to the fourth input terminal 33 according to the first control signal, the first driving signal output by the fourth output terminal 34 includes a third effective signal, which is obtained based on the second effective signal received through the fourth input terminal 33. For example, see Figure 6 In the second time period corresponding to the second valid signal, the first control signal is a control signal of the second level (corresponding to Figure 6The first switch 3 controls the fourth output terminal 34 to be connected to the fourth input terminal 33 according to the control signal of the second level, so that part or all of the second effective signal serves as the third effective signal mentioned above, so that the first drive signal output through the fourth output terminal 34 includes the third effective signal.

[0064] Since the first switch 3 controls the fourth output terminal 34 to be alternately connected to the third input terminal 32 or the fourth input terminal 33, the first drive signal outputted through the fourth output terminal 34 also includes the alternate second pre-charge signal and the third effective signal. As mentioned above, the third effective signal included in the first drive signal is used to drive the pixel to display content normally, and the second pre-charge signal included in the first drive signal is used to drive the pixel to pre-charge, so that the pixel is quickly lit to the required brightness without affecting the normal content display, thereby improving the driving speed. Figure 6 , taking the brightness including 256 levels as an example, the 256 levels of brightness can be represented by grayscale 00 to grayscale 255. Figure 6 The cases where the pixels are lit to grayscale 127, grayscale 00, and grayscale 255 are shown.

[0065] Exemplarily, the first switch 3 may include a first sub-switch and a second sub-switch, the first sub-switch being located between the fourth output terminal 34 and the third input terminal 32, and the second sub-switch being located between the fourth output terminal 34 and the fourth input terminal 33. When the first control signal is a control signal of a first level, the first sub-switch is closed, so that the fourth output terminal 34 is connected to the third input terminal 32, and the first drive signal includes a second pre-charge signal. When the first control signal is a control signal of a second level, the second sub-switch is closed, so that the fourth output terminal 34 is connected to the fourth input terminal 33, and the first drive signal includes a third valid signal.

[0066] In one example, the first switch 3 includes a first control terminal 31, and the first control terminal 31 is used to control both the first sub-switch and the second sub-switch. In this example, the first level and the second level are different levels. For example, the first level is higher than the second level, or the first level is lower than the second level. The implementation of this application does not limit the specific values ​​of the first level and the second level.

[0067] In another example, the first switch 3 includes two first control terminals 31 (referred to as the first control terminal A and the first control terminal B), the first control terminal A is used to control the first sub-switch, and the first control terminal B is used to control the second sub-switch. When the first control terminal A provides a control signal of a first level, the first sub-switch is closed, and when the first control terminal A provides a control signal of a level other than the first level, the first sub-switch is disconnected. When the first control terminal B provides a control signal of a second level, the second sub-switch is closed, and when the first control terminal B provides a control signal of a level other than the second level, the second sub-switch is disconnected. In this example, the first level and the second level can be the same level or different levels, and the implementation of this application also does not limit the specific values ​​of the first level and the second level.

[0068] For example, the first control terminal A provides a control signal of a first level to close the first sub-switch. At the same time, the first control terminal B provides a control signal of a level different from the second level to open the second sub-switch, thereby connecting the fourth output terminal 34 to the third input terminal 32, while the fourth output terminal 34 is disconnected from the fourth input terminal 33, and the first drive signal includes a second pre-charge signal.

[0069] For another example, the first control terminal A provides a control signal of a level different from the first level, so that the first sub-switch is disconnected. At the same time, the first control terminal B provides a control signal of a second level, so that the second sub-switch is closed, so that the fourth output terminal 34 is disconnected from the third input terminal 32, while the fourth output terminal 34 is connected to the fourth input terminal 33, and the first drive signal includes the third valid signal.

[0070] Regardless of the above examples, it is necessary to avoid the first sub-switch and the second sub-switch from being closed simultaneously, that is, to avoid the fourth output terminal 34 being connected to both the third input terminal 32 and the fourth input terminal 33, so as to avoid errors.

[0071] In the embodiment of the present application, no pre-charge power supply is required, and the function of the pre-charge power supply is replaced by the first data signal. Compared with the pre-charge power supply that can only provide one pre-charge level, the first data signal can provide a larger number of levels, so that there are more pre-charge levels that can be selected when driving the pixel for pre-charging. As mentioned above, the first data signal includes a valid data signal and a pre-charge data signal. For the pre-charge data signal, the first latch latches to obtain a first pre-charge signal, and the first drive signal output by the first switch includes a second pre-charge signal obtained based on the first pre-charge signal. Therefore, the first drive signal is a signal obtained based on the first pre-charge signal. Since the first drive signal is used to drive the pixel to pre-charge, the level provided by the first pre-charge signal affects the pre-charge level that can be selected when pre-charging.

[0072] Optionally, the first pre-charge signal occupies N bits, and the level at which the pixel is driven to pre-charge is a level corresponding to the value of the first pre-charge signal in a reference number of levels, the reference number being 2 to the power of N, and N being a positive integer greater than or equal to 1. In other words, when the first pre-charge signal occupies N bits, 2 to the power of N (i.e., the reference number) pre-charge levels can be provided. The embodiment of the present application does not limit the value of N. When the value of N is 8, 256 pre-charge levels can be provided, and the level at which the pixel is driven to pre-charge is one of the 256 pre-charge levels.

[0073] Exemplarily, the first switch 3 is a low voltage (LV) transistor, and the operating voltage of the low voltage transistor is about 1.2 V. Compared with the HV transistor or MV transistor used as a pre-charging transistor in the above related art, the LV transistor is smaller in size, so that the size of the display driver is smaller, the cost of the display driver is reduced, and the applicability of the display driver is improved.

[0074] In an exemplary embodiment, if Figure 7 As shown, each channel further includes a level shifter, a digital-to-analog converter and an amplifier. The level shifter may also be referred to as a level shifter or a level converter. The first switch module is coupled to the pixel through the level shifter, the digital-to-analog converter and the amplifier. The first drive signal output by the first switch module, for example, the first drive signal output by the fourth output terminal 34 included in the first switch 3, can be used to drive the pixel for pre-charging after being processed by the level shifter, the digital-to-analog converter and the amplifier.

[0075] The level shifter (eg, L / S) is used to update the voltage specification of the first driving signal to obtain an updated driving signal.

[0076] The digital-to-analog converter (eg, P DAC or N DAC) is used to convert the updated driving signal from a digital form to an analog form to obtain a converted driving signal.

[0077] The amplifier (eg, VH Amp or VL Amp) is used to amplify the converted driving signal to obtain an amplified driving signal, and the amplified driving signal is used to drive the pixel for pre-charging.

[0078] Thus, the fourth output terminal 34 of the first switch 3 outputs the first drive signal to the level shifter. Inside the level shifter, the voltage specification of the first drive signal is updated (for example, the voltage specification is increased or decreased) to obtain an updated drive signal, and the level shifter outputs the updated drive signal to the digital-to-analog converter, and the updated drive signal is a signal in digital form. Inside the digital-to-analog converter, the digital signal is converted into an analog signal to obtain a converted drive signal, and the digital-to-analog converter outputs the converted drive signal to the amplifier. Inside the amplifier, the converted drive signal is amplified to obtain an amplified drive signal, and the amplifier outputs the amplified drive signal, which is used to drive the pixel for pre-charging.

[0079] In an exemplary embodiment, the display driver includes at least two channels. Optionally, each column of pixels in the display panel corresponds to a plurality of channels. When the display driver includes only two channels, the plurality of channels corresponding to each column of pixels are the two channels included in the display driver. When the display driver includes at least three channels, the plurality of channels corresponding to each column of pixels are part or all of the at least three channels.

[0080] Among them, at least two channels correspond to at least two first drive signals one by one, because the first switch module (for example, the first switch 3) in each channel can obtain and output the first drive signal according to the above description. In an embodiment of the present application, the display driver also includes: a second switch module, which is used to obtain a first drive signal from at least two first drive signals according to a second control signal, and obtain a second drive signal according to the obtained first drive signal, and the second drive signal is used to drive the pixel for pre-charging. Among them, each column of pixels corresponds to a second switch module, and the second switch module selects a first drive signal corresponding to a channel from multiple channels corresponding to the column of pixels, and obtains a second drive signal according to the first drive signal, and drives the column of pixels for pre-charging through the second drive signal.

[0081] For example, see Figure 8 The second switch module is a second switch device 4 including a second control terminal 41, at least two fifth input terminals 42 and a fifth output terminal 43, the fifth output terminal 43 is coupled to the pixel, and the at least two fifth input terminals 42 are coupled to at least two channels in a one-to-one correspondence.

[0082] Taking each column of pixels corresponding to two channels as an example, when the channel does not include a level shifter, a digital-to-analog converter, and an amplifier, as Figure 8 As shown, at least two fifth input terminals 42 are coupled to the fourth output terminals 34 of the first switch 3 in at least two channels in a one-to-one correspondence. Accordingly, the driving signal corresponding to the connected fifth input terminals 42 refers to: the first driving signal output by the fourth output terminal 34.

[0083] Or, in the case where the channel includes a level shifter, a digital-to-analog converter, and an amplifier, such as Fig. 9 As shown, at least two fifth input terminals 42 are coupled to the amplifiers in at least two channels in a one-to-one correspondence. Accordingly, the driving signal corresponding to the connected fifth input terminal 42 refers to: a processed driving signal, which is a signal obtained by processing the first driving signal through a level shifter, a digital-to-analog converter and an amplifier.

[0084] Fig. 9 In FIG. 1 , 1st latch represents the first latch 1, 2nd latch represents the second latch 2, LV S / W represents the first switch 3, S / W refers to a switch, L / S represents a level shifter, P DAC and N DAC represent digital-to-analog converters, VHAmp and VL Amp represent amplifiers, and MUX represents the second switch 4. The connection relationship of each component can be seen in FIG. Fig. 9 Among them, for each column of pixels, it can be connected to P DAC and VH Amp, and can also be connected to N DAC and VL Amp, which is more flexible. By switching the connected channels, not only the polarity can be flipped, but also the P DAC, VHAmp, N DAC and VL Amp in different channels can be reused, which is beneficial to saving the number of digital-to-analog converters and amplifiers.

[0085] Optionally, at the same time, the odd-numbered columns and the even-numbered columns select different channels. Figure 8 , the second switch 4 on the left is coupled to the odd-numbered column pixels, and the second switch 4 on the right is coupled to the even-numbered column pixels. When the odd-numbered column pixels select channel 1 (i.e., the second switch 4 on the left controls the fifth input terminal 42 and the fifth output terminal 43 corresponding to channel 1 to be periodically connected), the even-numbered column pixels select channel 0 (i.e., the second switch 4 on the right controls the fifth input terminal 42 and the fifth output terminal 43 corresponding to channel 0 to be periodically connected). Alternatively, when the odd-numbered column pixels select channel 0 (i.e., the second switch 4 on the left controls the fifth input terminal 42 and the fifth output terminal 43 corresponding to channel 0 to be periodically connected), the even-numbered column pixels select channel 1 (i.e., the second switch 4 on the right controls the fifth input terminal 42 and the fifth output terminal 43 corresponding to channel 1 to be periodically connected).

[0086] The second switch 4 is used to control the fifth output terminal 43 to be connected to one of the at least two fifth input terminals 42 according to the second control signal provided by the second control terminal 41, and to obtain the second drive signal according to the first drive signal corresponding to the connected fifth input terminal, and output the second drive signal through the fifth output terminal 43 to drive the pixel to be pre-charged.

[0087] Next, the process of the second switch 4 acquiring the second driving signal is described.

[0088] Exemplarily, the second switch 4 may include at least two third sub-switches, each of which is located between a fifth input terminal 42 and a fifth output terminal 43, and different third sub-switches are located between different fifth input terminals 42 and fifth output terminals 43. In other words, different sub-switches correspond to different channels. When a sub-switch is closed, the second switch 4 can output the first drive signal corresponding to the channel corresponding to the closed sub-switch through the fifth output terminal 43. When any sub-switch is not closed, the second switch 4 does not output any signal through the fifth output terminal 43.

[0089] In one example, the second switch 4 includes at least two second control terminals 41, and the at least two second control terminals 41 correspond to at least two third sub-switches one by one. Taking the number of the second control terminals 41 as 2 as an example (recorded as the second control terminal A and the second control terminal B), the second control terminal A is used to control the third sub-switch 1, and the second control terminal B is used to control the third sub-switch 2.

[0090] When the second control terminal A provides a control signal of level X, the third sub-switch 1 is closed, and when the second control terminal A provides a control signal of a level other than level X, the third sub-switch 1 is opened. When the second control terminal B provides a control signal of level Y, the third sub-switch 2 is closed, and when the second control terminal B provides a control signal of a level other than level Y, the third sub-switch 2 is opened.

[0091] In Example 1, the second control terminal A alternately provides a control signal of level X and a control signal of other levels different from level X, so that the third sub-switch 1 is alternately closed and opened, so that the fifth input terminal 42 corresponding to the third sub-switch 1 is periodically connected to the fifth output terminal 43. This process is equivalent to: a column of pixels corresponding to the second switch 4 selects the channel corresponding to the third sub-switch 1. At the same time, the second control terminal B provides a control signal of other levels different from level Y, so that the third sub-switch 2 is opened, so that the fifth input terminal 42 corresponding to the third sub-switch 2 is not connected to the fifth output terminal 43, so as to avoid a column of pixels corresponding to the second switch 4 selecting the channel corresponding to the third sub-switch 1 and also selecting the channel corresponding to the third sub-switch 2, causing conflicts between different channels.

[0092] See also Figure 6 , Figure 6The second control signal shown is a control signal for the third sub-switch 1, the protruding portion of the second control signal represents a control signal of level X, and the non-protruding portion of the second control signal represents a control signal of a level other than level X. At the same time, the control signal for the third sub-switch 2 remains a control signal of a level other than level Y ( Figure 6 (not shown) so that the third sub-switch 2 remains open.

[0093] Therefore, based on Figure 6 The second control signal shown, while the third sub-switch 2 remains open, the third sub-switch 1 is alternately closed and opened. Specifically, during the period corresponding to the protruding part, since the third sub-switch 1 is closed, the second switch 4 outputs the first drive signal corresponding to the channel corresponding to the third sub-switch 1 through the fifth output terminal 43, that is, the second switch 4 outputs the second pre-charge signal (that is, the box marked with "pre-charge") and the third valid signal (that is, the blank box without marking) to the pixel to drive the pixel to perform pre-charge and normal content display. For example, Figure 6 The grayscale 127 shown represents driving the pixel to precharge so that the pixel is illuminated to grayscale 127. Figure 6 The solid line portion connected by the grayscale 127 shown represents that the pixel is displaying content normally. In addition, during the period corresponding to the non-protruding portion, since the third sub-switch 1 is disconnected, the second switch 4 does not output any signal (equivalent to outputting a blank signal) through the fifth output terminal 43, so that the pixel is in a high impedance (Hi-z) state. For example, Figure 6 The dotted line portion shown represents that the pixel is in a high impedance state. It can be seen that the second switch 4 outputs a second drive signal including: a second pre-charge signal, a third valid signal and a blank signal based on the first drive signal corresponding to the channel corresponding to the third sub-switch 1.

[0094] In Example 2, the second control terminal B alternately provides a control signal of level Y and a control signal of other levels different from level Y, so that the third sub-switch 2 is alternately closed and opened, so that the fifth input terminal 42 corresponding to the third sub-switch 2 is periodically connected to the fifth output terminal 43. This process is equivalent to: a column of pixels corresponding to the second switch 4 selects the channel corresponding to the third sub-switch 2. At the same time, the second control terminal A provides a control signal of other levels different from level X, so that the third sub-switch 1 is opened, so that the fifth input terminal 42 corresponding to the third sub-switch 1 is not connected to the fifth output terminal 43, so as to avoid a column of pixels corresponding to the second switch 4 from selecting the channel corresponding to the third sub-switch 2 and also selecting the channel corresponding to the third sub-switch 1, causing conflicts between different channels.

[0095] For the second switch 4 corresponding to a column of pixels, the above-mentioned Example 1 and Example 2 can be used alternately to switch the channel selected by the column of pixels. For the second switch 4 corresponding to the adjacent odd-numbered columns of pixels and even-numbered columns of pixels, when the second switch 4 corresponding to the odd-numbered columns of pixels adopts Example 1, the second switch 4 corresponding to the even-numbered columns of pixels adopts Example 2, or when the second switch 4 corresponding to the odd-numbered columns of pixels adopts Example 2, the second switch 4 corresponding to the even-numbered columns of pixels adopts Example 1, so that the odd-numbered columns of pixels and the even-numbered columns of pixels in the above description can select different channels at the same time.

[0096] Regardless of which of the above examples, it is necessary to avoid closing different third sub-switches at the same time, that is, avoid connecting the fifth output terminal 43 to different fifth input terminals 42 at the same time, so as to avoid errors. In the embodiment of the present application, at most only one third sub-switch is closed at the same time, so as to ensure that the fifth output terminal 43 is connected to only one fifth input terminal 42 at a time.

[0097] The high impedance state is mentioned above. When a pixel is in the high impedance state, the pixel can maintain the display state before the high impedance state, also called the previous state. For example, see Figure 6 After the pixel is lit to grayscale 127, the pixel displays normal content (solid line part), and then the pixel enters a high impedance state (dashed line part), and the pixel continues to display normal content. Figure 6 The other dotted parts in are also in high impedance state, which will not be described in detail here. Optionally, when the display driver includes an amplifier, the high impedance state can also charge the amplifier to increase the output speed of the subsequent amplifier. The amplifier has been described above and will not be described in detail here.

[0098] In an exemplary embodiment, the period of driving the pixel for precharging is within the period of the pixel being in a high impedance (Hi-z) state. Since the period of driving the pixel for precharging is within the period of the pixel being in a high impedance state, the period of the pixel being in a high impedance state is reused, thereby preventing the precharging process from occupying other periods, and ensuring that the precharging process does not affect normal content display.

[0099] like Fig.10 As shown, in the case where precharging is not performed, the functions of the first latch 1, the second latch 2 and the first switch 3 included in the display driver are as follows.

[0100] The first latch 1 latches the third data signal provided by the first input terminal 11, obtains and outputs a fourth data signal through the first output terminal 12 and the second output terminal 13 respectively, and the fourth data signal includes a fourth valid signal. Optionally, the first enable terminal 14 of the first latch 1 provides a third enable signal, such as Fig.10 As shown, the first latch 1 latches the valid data signal (used for content display) included in the third data signal according to the third enable signal to obtain a fourth data signal, and the fourth data signal includes a fourth valid signal. The first latch 1 outputs the fourth data signal to the second latch 2 through the first output terminal 12, and the first latch 1 outputs the fourth data signal to the first switch 3 through the second output terminal 13.

[0101] The second latch 2 latches the fourth valid signal, obtains and outputs the fifth valid signal through the third output terminal 22. Optionally, the second enable terminal 23 of the second latch 2 provides a fourth enable signal, such as Fig.10 As shown, the second latch 2 latches the fourth valid signal in the fourth data signal according to the fourth enable signal to obtain a fifth valid signal, and outputs the fifth valid signal to the first switch 3 through the third output terminal 22 .

[0102] The first switch 3 receives a fourth data signal through the third input terminal 32, the fourth data signal including a fourth valid signal, and receives a fifth valid signal through the fourth input terminal 33. Based on this, the first switch 3 outputs a third drive signal to the second switch 4 according to the third control signal provided by the first control terminal 31 and the received signal. The third drive signal includes Fig.10 The sixth valid signal (used for content display) is shown.

[0103] The second switch 4 outputs a fourth drive signal according to the fourth control signal and the third drive signal provided by the second control terminal 41. Fig.10 In the period corresponding to the protruding part of the fourth control signal, the second switch 4 outputs the sixth effective signal, so that the pixel displays the content normally. In the period corresponding to the non-protruding part of the fourth control signal, the second switch 4 does not output any signal (i.e., outputs a blank signal), so that the pixel is in a high impedance state, i.e. Fig.10 Hi-z as shown. Thus, the fourth driving signal includes the sixth effective signal and the blank signal.

[0104] As mentioned above, in the embodiment of the present application, the period of driving the pixel for precharging is within the period of time when the pixel is in a high impedance state. Fig.10 The first Hi-z period shown in FIG. 1 corresponds to a period in which the pixel is in a high impedance state. The period is equal to Figure 6 The sum of the following two periods: Figure 6The first dotted line in corresponds to the time period, and Figure 6 The time period corresponding to the medium grayscale 127. Thus, the reuse of the time period when the pixel is in a high impedance state is achieved, so that the pre-charging process is prevented from occupying other time periods, and the pre-charging process is ensured not to affect the normal content display.

[0105] Fig.11 is a flow chart of a driving method of a display driver provided in an embodiment of the present application, which method can be applied to Figures 3 to 5 , Figures 7 to 9 In the display driver shown in any of the figures, the display driver includes at least one channel, and each channel includes a latch module and a first switch module. Fig.11 As shown, the method includes the following steps 1101 to 1103.

[0106] Step 1101: latching a first data signal through a latch module to obtain a second data signal, where the second data signal includes a first pre-charge signal and a first valid signal.

[0107] Step 1102: latch the first valid signal included in the second data signal by a latch module to obtain a second valid signal.

[0108] Step 1103, obtaining a first drive signal through a first switch module according to a second data signal, a second valid signal and a first control signal, wherein the first drive signal is used to drive the pixels included in the display panel to pre-charge, and the first drive signal includes an alternating second pre-charge signal and a third valid signal.

[0109] Exemplarily, the latch module includes a first latch and a second latch, the first latch includes a first input terminal, a first output terminal and a second output terminal, the second latch includes a second input terminal and a third output terminal, and the first switch module is a first switch including a third input terminal, a fourth input terminal, a first control terminal and a fourth output terminal. Accordingly, step 1101 includes: latching the first data signal provided by the first input terminal through the first latch to obtain the second data signal, outputting the second data signal to the second latch through the first output terminal, and outputting the second data signal to the first switch through the second output terminal. Step 1102 includes: receiving the second data signal through the second input terminal through the second latch, latching the first valid signal included in the second data signal, obtaining and outputting the second valid signal to the first switch through the third output terminal. Step 1103 includes: receiving the second data signal through the third input terminal through the first switch, receiving the second valid signal through the fourth input terminal, and controlling the fourth output terminal to be alternately connected with the third input terminal or the fourth input terminal according to the first control signal provided by the first control terminal, and obtaining and outputting the first drive signal through the fourth output terminal.

[0110] Exemplarily, the first pre-charge signal occupies N bits, and the level driving the pixel for pre-charging is a level corresponding to the value of the first pre-charge signal among a reference number of levels, the reference number is 2 to the power of N, and N is a positive integer greater than or equal to 1.

[0111] In an exemplary embodiment, the period of driving the pixel for precharging is within the period of the pixel being in a high impedance state. Exemplarily, the first switch is a low voltage transistor.

[0112] In an exemplary embodiment, the display driver includes at least two channels, the at least two channels correspond to at least two first drive signals one by one, and the display driver also includes a second switch module. The driving method also includes: obtaining a first drive signal from the at least two first drive signals according to a second control signal through the second switch module, and obtaining a second drive signal according to the obtained first drive signal, and the second drive signal is used to drive the pixel to pre-charge.

[0113] Exemplarily, the second switch module is a second switch including a second control terminal, at least two fifth input terminals and a fifth output terminal, the fifth output terminal is coupled to the pixel, and the at least two fifth input terminals are coupled to the at least two channels in a one-to-one correspondence. The second switch module obtains a first drive signal from at least two first drive signals according to the second control signal, and obtains a second drive signal according to the obtained first drive signal, including: controlling the fifth output terminal to be connected to one of the at least two fifth input terminals according to the second control signal provided by the second control terminal, and obtaining the second drive signal according to the first drive signal corresponding to the connected fifth input terminal, and outputting the second drive signal through the fifth output terminal to drive the pixel to pre-charge.

[0114] Exemplarily, each channel also includes a level shifter, a digital-to-analog converter and an amplifier. The driving method provided in the embodiment of the present application also includes: updating the voltage specification of the first driving signal through the level shifter to obtain an updated driving signal; converting the updated driving signal from digital form to analog form through the digital-to-analog converter to obtain a converted driving signal; amplifying the converted driving signal through the amplifier to obtain an amplified driving signal, and the amplified driving signal is used to drive the pixel for pre-charging.

[0115] It should be noted that the specific implementation methods of the above steps can be referred to in the device side embodiments, and will not be repeated in the method side embodiments.

[0116] Fig.12 is a schematic diagram of the structure of a display device provided in an embodiment of the present application. Fig.12 As shown, the display device may include a display driver 00 and a display panel 10. The display driver 00 is, for example, Figures 3 to 5, Figures 7 to 9 A display driver as shown in any of the accompanying drawings.

[0117] Among them, combined Figure 1 As can be seen from the corresponding description, the display panel 10 may include a plurality of pixels P1. The display driver 00 may be coupled to the plurality of pixels P1 and used to drive the plurality of pixels P1 to emit light.

[0118] It should be noted that the display device generally may include: a source driver and a gate driver. A plurality of pixels P1 may be arranged in an array. The gate driver may be coupled to multiple rows of pixels P1 and transmit signals to the multiple rows of pixels. The source driver may be coupled to multiple columns of pixels P1 and transmit signals to the multiple columns of pixels. The pixel P1 may emit light based on the received signal. The display driver recorded in the above embodiment may be integrated into the source driver, that is, the display driver recorded in the above embodiment may be part of the source driver. Optionally, the display device recorded in the embodiment of the present application may be: an organic light-emitting diode (OLED) display device, electronic paper, mobile phone, tablet computer, television, monitor, laptop computer or navigator, or any product or component with a display function.

[0119] It should be understood that the terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be the common meanings understood by people with ordinary skills in the field to which the present disclosure belongs.

[0120] The words “first”, “second” or “third” and similar terms used in the specification and the claims do not indicate any order, quantity or importance but are only used to distinguish different components.

[0121] "A" or "an" and other similar words do not indicate a limit to quantity, but indicate the presence of at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing before "including" or "comprising" include the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Connected" or "coupled" refers to electrical connection.

[0122] The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A display driver for a display panel, characterized in that: The display driver comprises at least one channel, each channel comprising: A latch module, used for latching the first data signal to obtain a second data signal, wherein the second data signal includes a first pre-charge signal and a first valid signal; The latch module is further used to latch the first valid signal included in the second data signal to obtain a second valid signal; The first switch module is used to obtain a first drive signal according to the second data signal, the second valid signal and the first control signal, the first drive signal is used to drive the pixels included in the display panel to pre-charge, and the first drive signal includes an alternating second pre-charge signal and a third valid signal.

2. The display driver according to claim 1, characterized in that: The latch module includes a first latch and a second latch, the first latch includes a first input terminal, a first output terminal and a second output terminal, the second latch includes a second input terminal and a third output terminal, and the first switch module is a first switch including a third input terminal, a fourth input terminal, a first control terminal and a fourth output terminal; The first latch is used to latch the first data signal provided by the first input terminal to obtain the second data signal, output the second data signal to the second latch through the first output terminal, and output the second data signal to the first switch through the second output terminal; The second latch is used to receive the second data signal through the second input terminal, latch the first valid signal included in the second data signal, obtain and output the second valid signal to the first switch through the third output terminal; The first switch is used to receive the second data signal through the third input terminal, receive the second valid signal through the fourth input terminal, and control the fourth output terminal to be alternately connected to the third input terminal or the fourth input terminal according to the first control signal provided by the first control terminal, so as to obtain and output the first drive signal through the fourth output terminal.

3. The display driver according to claim 1 or 2, characterized in that: The first pre-charge signal occupies N bits, and the level driving the pixel for pre-charging is a level corresponding to the value of the first pre-charge signal among a reference number of levels, the reference number is 2 to the power of N, and N is a positive integer greater than or equal to 1.

4. The display driver according to any one of claims 1 to 3, characterized in that: The period during which the pixel is driven to perform precharging is within the period during which the pixel is in a high impedance state.

5. The display driver according to any one of claims 1 to 4, characterized in that: The display driver includes at least two channels, and the at least two channels correspond to at least two first driving signals one by one. The display driver also includes: The second switch module is used to obtain a first drive signal from the at least two first drive signals according to a second control signal, and to obtain a second drive signal according to the obtained first drive signal, wherein the second drive signal is used to drive the pixel to perform pre-charging.

6. The display driver according to claim 5, characterized in that: The second switch module is a second switch including a second control terminal, at least two fifth input terminals and a fifth output terminal, the fifth output terminal is coupled to the pixel, and the at least two fifth input terminals are coupled to the at least two channels in a one-to-one correspondence; The second switch is used to control the fifth output terminal to be connected to one of the at least two fifth input terminals according to the second control signal provided by the second control terminal, and to obtain the second drive signal according to the first drive signal corresponding to the connected fifth input terminal, and output the second drive signal through the fifth output terminal to drive the pixel to be pre-charged.

7. A method for driving a display driver, characterized in that: The driving method is applied to the display driver according to any one of claims 1 to 6, wherein the display driver comprises at least one channel, each channel comprises a latch module and a first switch module, and the driving method comprises: The latch module latches the first data signal to obtain a second data signal, wherein the second data signal includes a first pre-charge signal and a first valid signal; Latching the first valid signal included in the second data signal by the latch module to obtain a second valid signal; A first drive signal is obtained through the first switch module according to the second data signal, the second valid signal and the first control signal. The first drive signal is used to drive the pixels included in the display panel to pre-charge. The first drive signal includes an alternating second pre-charge signal and a third valid signal.

8. The driving method according to claim 7, characterized in that: The latch module includes a first latch and a second latch, the first latch includes a first input terminal, a first output terminal and a second output terminal, the second latch includes a second input terminal and a third output terminal, and the first switch module is a first switch including a third input terminal, a fourth input terminal, a first control terminal and a fourth output terminal; The latching of the first data signal by the latch module to obtain the second data signal includes: latching the first data signal provided by the first input terminal by the first latch to obtain the second data signal, outputting the second data signal to the second latch through the first output terminal, and outputting the second data signal to the first switch through the second output terminal; The latching module latches the first valid signal included in the second data signal to obtain a second valid signal, comprising: receiving the second data signal through the second input terminal through the second latch, latching the first valid signal included in the second data signal, obtaining and outputting the second valid signal to the first switch through the third output terminal; The method of obtaining the first drive signal according to the second data signal, the second valid signal and the first control signal through the first switch module includes: receiving the second data signal through the third input terminal through the first switch, receiving the second valid signal through the fourth input terminal, and controlling the fourth output terminal to be alternately connected to the third input terminal or the fourth input terminal according to the first control signal provided by the first control terminal, so as to obtain and output the first drive signal through the fourth output terminal.

9. The driving method according to claim 7 or 8, characterized in that: The first pre-charge signal occupies N bits, and the level driving the pixel for pre-charging is a level corresponding to the value of the first pre-charge signal among a reference number of levels, the reference number is 2 to the power of N, and N is a positive integer greater than or equal to 1.

10. The driving method according to any one of claims 7 to 9, characterized in that: The period during which the pixel is driven to perform precharging is within the period during which the pixel is in a high impedance state.

11. The driving method according to any one of claims 7 to 10, characterized in that: The display driver includes at least two channels, and the at least two channels correspond to at least two first driving signals one by one. The display driver also includes a second switch module. The driving method also includes: The second switch module obtains a first drive signal from the at least two first drive signals according to a second control signal, and obtains a second drive signal according to the obtained first drive signal, wherein the second drive signal is used to drive the pixel for pre-charging.

12. The driving method according to claim 11, characterized in that: The second switch module is a second switch including a second control terminal, at least two fifth input terminals and a fifth output terminal, the fifth output terminal is coupled to the pixel, and the at least two fifth input terminals are coupled to the at least two channels in a one-to-one correspondence; The step of acquiring a first drive signal from the at least two first drive signals according to the second control signal by the second switch module, and acquiring a second drive signal according to the acquired first drive signal, comprises: The second switch controls the fifth output terminal to be connected to one of the at least two fifth input terminals according to the second control signal provided by the second control terminal, obtains the second drive signal according to the first drive signal corresponding to the connected fifth input terminal, and outputs the second drive signal through the fifth output terminal to drive the pixel for pre-charging.

13. A display device, characterized in that: The display device comprises a display panel and a display driver as claimed in any one of claims 1 to 6, wherein the display driver is coupled to pixels included in the display panel to drive the pixels.

Images