CN117813647A - Liquid crystal driving apparatus and method for driving liquid crystal - Google Patents

Abstract

Embodiments of the present application provide a liquid crystal driving device and a method for driving liquid crystal, the liquid crystal driving device including: a processor for transmitting a first driving control signal to the liquid crystal driver; the liquid crystal driver is used for converting the first driving control signals into a plurality of groups of first voltage signals, wherein each group of first voltage signals in the plurality of groups of first voltage signals comprises a plurality of first voltages, and the first voltages correspond to a plurality of pixels in the liquid crystal display; outputting a plurality of groups of first voltage signals to a plurality of electrodes of a plurality of pixels in a time-sharing mode in a first preset time period so as to control the gray scale of the plurality of pixels; each group of first voltage signals are respectively output within a period of time within a first preset time period, each first voltage in the plurality of first voltages is respectively used for controlling the gray scale of a pixel corresponding to the first voltage, and at least two groups of first voltage signals in the plurality of groups of first voltage signals are different, so that finer gray scale adjustment of the liquid crystal display screen can be realized.

Description

Liquid crystal driving apparatus and method for driving liquid crystal Technical Field

The embodiment of the application relates to the technical field of display, in particular to a liquid crystal driving device and a method for driving liquid crystal.

Background

With advances in electronic science and technology, performance of electronic devices has been rapidly improved. More and more users prefer to take images, watch videos, etc. by using electronic devices, which puts higher demands on the picture quality of the liquid crystal display. In order to improve the picture quality, high dynamic range (high dynamic range, HDR) display technology is widely used.

In the HDR display technology currently applied to a liquid crystal display screen, multiple frames of images with different brightness are usually generated in a period of time, and the multiple frames of images with different brightness are overlapped to generate a new image, however, the method easily causes flicker of a picture. Thus, it is further proposed to modify the hardware structure of the liquid crystal driving circuit (e.g. to add more stages of voltage dividing resistors in the digital-to-analog conversion circuit) to achieve finer-precision gray scale adjustment. However, modifying the hardware structure of the liquid crystal driving circuit results in an excessively high layout area occupied by the chip and an increase in manufacturing cost of the liquid crystal driving module, and in addition, the modified hardware structure is generally difficult to adapt to other modules existing in the electronic device (such as a communication module and a processing module), so that a scheme for modifying the hardware structure of the liquid crystal driving circuit is difficult to implement. In summary, improving the display effect of the lcd still becomes a problem to be solved.

Disclosure of Invention

According to the liquid crystal driving device and the method for driving the liquid crystal, finer gray scale adjustment of the liquid crystal display can be achieved, and therefore the picture display effect of the liquid crystal display is improved. In order to achieve the above purpose, the following technical scheme is adopted in the application.

In a first aspect, embodiments of the present application provide a liquid crystal driving device, including: a processor and a liquid crystal driver; the processor is used for sending a first driving control signal to the liquid crystal driver; the liquid crystal driver is used for converting the first driving control signals into a plurality of groups of first voltage signals, wherein each group of first voltage signals in the plurality of groups of first voltage signals comprises a plurality of first voltages, and the plurality of first voltages are in one-to-one correspondence with a plurality of pixels in the liquid crystal display screen; outputting the multiple groups of first voltage signals to multiple electrodes of the multiple pixels in a time-sharing mode in a first preset time period so as to control the gray scale of the multiple pixels; the first voltage signals of each group are respectively output in a period of time within the first preset time period, each first voltage of the plurality of first voltages is respectively used for controlling the gray scale of a pixel corresponding to the first voltage, and at least two groups of first voltage signals of the plurality of groups of first voltage signals are different.

In general, due to the inertia of liquid crystal molecules, voltages of different magnitudes are applied to pixel electrodes in a liquid crystal display panel in a period of time, and the effect of electrostatic fields generated by the voltages of different magnitudes on the liquid crystal molecules is the same as that of electrostatic fields generated by effective values of the voltages in the period of time, which may refer to the same deflection angle of the liquid crystal molecules. Therefore, in the liquid crystal driving device provided by the embodiment of the application, the processor sends the plurality of groups of driving control signals to the liquid crystal driver, so that the liquid crystal driver can convert the plurality of groups of driving control signals into a plurality of voltage values in a corresponding time period, the effective values of the plurality of voltage values are preset voltage values, more voltage values can be further inserted on the basis of the existing voltage, and therefore liquid crystal molecules in the liquid crystal display screen can be controlled to realize more deflection angles, further finer gray scale adjustment of the liquid crystal display screen can be realized, and improvement of the picture quality of the liquid crystal display screen is facilitated.

Based on the first aspect, in a possible implementation manner, the first preset time period is a display refresh period of the liquid crystal display screen.

By setting the first preset period to the display refresh period of the liquid crystal display screen, the liquid crystal driver can provide the pixel electrode in the liquid crystal display screen with a variable voltage in the display refresh period of the liquid crystal display screen, so that more voltage values can be further inserted on the basis of the existing voltage; compared with the prior art that fixed voltage is provided for the pixel electrode in the liquid crystal display screen in the display refresh period of the liquid crystal display screen, the method can realize finer gray scale adjustment of the liquid crystal display screen, and is beneficial to improving the picture quality of the liquid crystal display screen.

Based on the first aspect, in a possible implementation manner, the first driving control signals include multiple groups of first driving control signals; the liquid crystal driver comprises a digital-to-analog conversion circuit; the digital-to-analog conversion circuit is used for converting each set of driving control signals in the plurality of sets of first driving control signals into a set of voltage signals.

Based on the first aspect, in a possible implementation manner, the liquid crystal driver further includes a memory; the processor is specifically configured to: and after the liquid crystal driving device is powered on, when the liquid crystal display screen is lightened, during video playing or when a display picture is switched, storing the plurality of groups of first driving control signals into the memory.

Based on the first aspect, in a possible implementation manner, the liquid crystal driver further includes a timing controller, the timing controller is configured to generate a clock signal, and the first preset time period includes a plurality of clock periods of the clock signal; the liquid crystal driver is specifically for: the plurality of sets of first driving control signals are read from the memory in a time-sharing manner based on the clock signal, and the plurality of sets of first driving control signals are converted into the plurality of sets of first voltage signals.

Based on the first aspect, in one possible implementation manner, the at least two sets of first voltage signals include a first set of first voltage signals and a second set of first voltage signals; the first voltage for a pixel in the first set of first voltage signals is different from the first voltage for the pixel in the second set of first voltage signals.

Based on the first aspect, in a possible implementation manner, the first voltage for one pixel in any one of the at least two sets of first voltage signals is different from the first voltage for the pixel in any other one of the at least two sets of first voltage signals.

Based on the first aspect, in one possible implementation manner, during the first preset time period, the plurality of first voltages are positive polarity voltage signals; the processor is further used for sending a second driving control signal to the liquid crystal driver; the liquid crystal driver is further configured to convert the second driving control signal into a plurality of groups of second voltage signals, where each group of second voltage signals in the plurality of groups of second voltage signals includes a plurality of second voltages, and the plurality of second voltages are in one-to-one correspondence with the plurality of pixels; outputting the multiple groups of second voltage signals to the multiple electrodes in a time-sharing mode within a second preset time period; wherein each set of second voltage signals is output within a period of time within the second preset time period, each second voltage in the plurality of second voltages is used for controlling the gray scale of the pixel corresponding to the second voltage, and at least two sets of second voltage signals in the plurality of sets of second voltage signals are different; the plurality of second voltages are negative polarity voltage signals during the second preset time period.

Based on the first aspect, in a possible implementation manner, the second preset time period is a display refresh period of the liquid crystal display screen.

By setting the plurality of first voltages to positive polarity voltage signals in a first preset time period and setting the plurality of second voltages to negative polarity voltage signals in a second preset time period, the aging of the liquid crystal can be avoided, and the service life of the liquid crystal can be prolonged.

Based on the first aspect, in one possible implementation manner, the at least two sets of second voltage signals include a first set of second voltage signals and a second set of second voltage signals; the second voltage for a pixel in the first set of second voltage signals is different from the second voltage for the pixel in the second set of second voltage signals.

Based on the first aspect, in a possible implementation manner, the second voltage for one pixel in any one of the at least two sets of second voltage signals is different from the first voltage for the pixel in any other one of the at least two sets of second voltage signals.

Based on the first aspect, in a possible implementation manner, the liquid crystal driving device further includes the liquid crystal display screen.

In a second aspect, embodiments of the present application provide a method for driving a liquid crystal, the method comprising: a processor in a liquid crystal driving device sends a first driving control signal to the liquid crystal driver; the liquid crystal driver in the liquid crystal driving device converts the first driving control signals into a plurality of groups of first voltage signals, wherein each group of first voltage signals in the plurality of groups of first voltage signals comprises a plurality of first voltages, and the plurality of first voltages are in one-to-one correspondence with a plurality of pixels in the liquid crystal display screen; outputting the multiple groups of first voltage signals to multiple electrodes of the multiple pixels in a time-sharing mode in a first preset time period so as to control the gray scale of the multiple pixels; the first voltage signals of each group are respectively output in a period of time within the first preset time period, each first voltage of the plurality of first voltages is respectively used for controlling the gray scale of a pixel corresponding to the first voltage, and at least two groups of first voltage signals of the plurality of groups of first voltage signals are different.

Based on the second aspect, in one possible implementation manner, the at least two sets of first voltage signals include a first set of first voltage signals and a second set of first voltage signals; the first voltage for a pixel in the first set of first voltage signals is different from the first voltage for the pixel in the second set of first voltage signals.

Based on the second aspect, in a possible implementation manner, the first voltage for one pixel in any one of the at least two sets of first voltage signals is different from the first voltage for the pixel in any other one of the at least two sets of first voltage signals.

Based on the second aspect, in a possible implementation manner, the first preset time period is a display refresh period of the liquid crystal display screen.

Based on the second aspect, in a possible implementation manner, the first driving control signals include multiple groups of first driving control signals; the liquid crystal driver in the liquid crystal driving device converts the first driving control signal into a plurality of sets of first voltage signals, including: the liquid crystal driver converts each of the plurality of sets of first driving control signals into a set of first voltage signals.

Based on the second aspect, in a possible implementation manner, the sending, by the processor in the liquid crystal driving device, a first driving control signal to the liquid crystal driver includes: and after the liquid crystal driving device is powered on, when the liquid crystal display screen is lightened, during video playing or when a display picture is switched, storing the plurality of groups of first driving control signals into a memory in the liquid crystal driver.

Based on the second aspect, in a possible implementation manner, the converting, by a liquid crystal driver in the liquid crystal driving device, the first driving control signal into a plurality of groups of first voltage signals includes: the liquid crystal driver reads the plurality of groups of first driving control signals from the memory in a time-sharing manner within the first preset time period based on a clock signal generated by a timing controller in the liquid crystal driver, and converts the plurality of groups of first driving control signals into the plurality of groups of first voltage signals; wherein the first preset time period comprises a plurality of clock periods of the clock signal.

Based on the second aspect, in one possible implementation manner, during the first preset time period, the plurality of first voltages are positive polarity voltage signals; the method further comprises the steps of: the processor sends a second drive control signal to the liquid crystal driver; the liquid crystal driver converts the second driving control signal into a plurality of groups of second voltage signals, wherein each group of second voltage signals in the plurality of groups of second voltage signals comprises a plurality of second voltages, and the plurality of second voltages are in one-to-one correspondence with the plurality of pixels; outputting the multiple groups of second voltage signals to the multiple electrodes in a time-sharing mode within a second preset time period; wherein each set of second voltage signals is output within a period of time within the second preset time period, each second voltage in the plurality of second voltages is used for controlling the gray scale of the pixel corresponding to the second voltage, and at least two sets of second voltage signals in the plurality of sets of second voltage signals are different; the plurality of second voltages are negative polarity voltage signals during the second preset time period.

Based on the second aspect, in a possible implementation manner, the second preset time period is a display refresh period of the liquid crystal display screen.

Based on the second aspect, in one possible implementation manner, the at least two sets of second voltage signals include a first set of second voltage signals and a second set of second voltage signals; the second voltage for a pixel in the first set of second voltage signals is different from the second voltage for the pixel in the second set of second voltage signals.

Based on the second aspect, in a possible implementation manner, the second voltage for one pixel in any one of the at least two sets of second voltage signals is different from the first voltage for the pixel in any other one of the at least two sets of second voltage signals.

It should be understood that, in the second aspect of the present application, the technical solutions of the first aspect of the present application are consistent, and the beneficial effects obtained by each aspect and the corresponding possible embodiments are similar, which are not repeated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of an application scenario provided in an embodiment of the present application;

FIG. 2 is a schematic voltage diagram for driving liquid crystal deflection provided in an embodiment of the present application;

fig. 3 is a schematic structural view of a liquid crystal driving device according to an embodiment of the present disclosure;

fig. 4 is a schematic structural view of an electrode plate 20 according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a liquid crystal driver according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a digital-to-analog converter according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a liquid crystal driving method according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Reference herein to "first" or "second" and similar words does not denote any order, quantity, or importance, but rather is used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The term "coupled" and the like are not limited to a physical or mechanical direct connection, but may include an electrical connection, whether direct or indirect, equivalent to a generalized communication.

In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion. In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" means two or more. For example, the plurality of data signal outputs means two or more data signal outputs.

The liquid crystal driving device provided by the embodiment of the application can comprise an electronic device or a module, a chip, a chipset, a circuit board or a component integrated in the electronic device. The electronic device may be a User Equipment (UE) such as a mobile phone, a tablet computer, or a portable device of various types such as a smart watch. The electronic device may be mounted with the liquid crystal display 200 as shown in fig. 1, and the liquid crystal driving apparatus 100 may drive the liquid crystal display 200 to display a picture. When the liquid crystal driving apparatus 100 is a chip or a chipset or a circuit board mounted with the chip or the chipset, the chip or the chipset or the circuit board mounted with the chip or the chipset may operate under software driving. The embodiment of the present application is described by taking the liquid crystal driving device 100 and the liquid crystal display 200 as examples, which are separately provided, but not limited to the above-described embodiments.

Referring to fig. 1, a schematic diagram of an application scenario of a liquid crystal driving device 100 according to an embodiment of the present application is shown. In the application scenario illustrated in fig. 1, a liquid crystal driving device 100 and a liquid crystal display 200 are shown. First, the structure and display principle of the liquid crystal display 200 will be described. The liquid crystal display 200 generally includes a plurality of components such as an electrode plate 20, an electrode plate 21, a liquid crystal layer 23, a backlight 24, a polarizer 25, a color filter 26, and a polarizer 27 shown in fig. 1; the lcd 200 may further include additional components, which are not described herein. The liquid crystal layer 23 is disposed between the electrode plate 20 and the electrode plate 21. After the liquid crystal display 200 is powered on, light is emitted from the backlight 24 side, and passes through the polarizer 25, the electrode plate 20, the liquid crystal layer 23, the electrode plate 21, the color filter 26 and the polarizer 27, respectively, to display a picture in the screen. The liquid crystal driving device 100 is connected to the electrode plate 20 and the electrode plate 21. After the liquid crystal driving device 100 is powered on, the liquid crystal driving device 100 applies a voltage to the electrode plates 20 and 21 (for example, applies a voltage in which positive and negative are alternately applied to the electrode plates 20, and applies a common voltage to the electrode plates 21). Thus, an electrostatic field is formed between the electrode plate 20 and the electrode plate 21. The liquid crystal molecules in the liquid crystal layer 23 are deflected by the electrostatic field, that is, the arrangement direction of the liquid crystal molecules is changed; the applied voltages are different in magnitude, the deflection angles of the liquid crystal molecules are different, and the arrangement directions of the liquid crystal molecules are different. Since light has a characteristic of traveling along the crystal extension direction of the liquid crystal molecules, the arrangement direction of the liquid crystal molecules can be controlled by controlling the magnitude of the voltage applied to the electrode plate 20, thereby controlling the gray scale of the liquid crystal display panel 200.

Based on the display principle of the liquid crystal display 200 as described above, the higher the accuracy of the voltages applied to the electrode plates 20 and 21, the higher the number of gray-scale value bits of the liquid crystal display, and the higher the picture quality. In the conventional art, the accuracy of voltage is achieved by a plurality of voltage dividing resistors provided in a liquid crystal driving device, and the voltage dividing is finer as the number of the voltage dividing resistors is larger. Of course, the greater the number of voltage dividing resistors, the greater the number of signal transmission lines led out from the voltage dividing resistors. However, too many signal transmission lines will generate larger parasitic capacitance in the signal transmission line area, and the excessive parasitic capacitance seriously decreases the signal transmission rate, thereby affecting the display effect of the lcd 200. Thus, in the liquid crystal display technology, it is difficult to further improve the picture quality of the liquid crystal display panel by providing more voltage dividing resistors to achieve finer voltage division.

In addition to the display principle of the liquid crystal display 200 described above, further, due to the inertia of the liquid crystal molecules, voltages of different magnitudes are applied to the electrode plate 20 and the electrode plate 21 for a certain period of time, and the effect of the electrostatic field generated by the voltages of different magnitudes on the liquid crystal molecules is the same as the effect of the electrostatic field generated by the effective value of the voltages during the period of time on the liquid crystal molecules. The same influence may mean that the deflection angles of the liquid crystal molecules are the same. This principle is described in more detail below by taking fig. 2 as an example. Fig. 2 (a) shows a case where voltages are applied to liquid crystal molecules in each period when the same frame of screen is displayed on the liquid crystal display panel 200; fig. 2 (b) shows the effective voltage value of each period voltage in fig. 2 (a). As shown in (a) of fig. 2, the period T1 is divided into four identical periods T1 to T4, and the period T2 is divided into four identical periods T5 to T8, where the period T1 and the period T2 may be a period of one refresh of the liquid crystal display (for example, a period of time when the liquid crystal molecules rotate in response to an electrostatic field). Wherein, in the period T1, a forward ("+") voltage is applied to the liquid crystal molecules; in the period T2, a negative ("-") voltage is applied to the liquid crystal molecules. It should be noted that, in the embodiments of the present application, the positive direction and the negative direction of the voltage represent only the polarity of the voltage, and are not used to limit the magnitude of the voltage. As shown in (a) of fig. 2, 2V voltage is applied to the electrode plate 20 and the electrode plate 21 in the period t1, 4V voltage is applied to the electrode plate 20 and the electrode plate 21 in the period t2, 3V voltage is applied to the electrode plate 20 and the electrode plate 21 in the period t3, and 2V voltage is applied to the electrode plate 20 and the electrode plate 21 in the period t 4. The effective value of the voltage applied to the electrode plates 20 and 21 in the period T1 is [ (2) ² +4 ² +3 ² +2 ² )/4] ^1/2 =2.87V, as shown in (b) in fig. 2. Accordingly, the effect of the electrostatic field generated by the voltages of the four periods t1 to t4 on the liquid crystal is the same as the effect of the electrostatic field generated by the voltage of 2.87V on the liquid crystal. Also, a voltage of-2V is applied to the electrode plate 20 and the electrode plate 21 in the period t5, a voltage of-4V is applied to the electrode plate 20 and the electrode plate 21 in the period t6, and a voltage of-4V is applied to the electrode plate 20 and the electrode plate 21 in the periodt3 applies a voltage of-3V to electrode plate 20 and electrode plate 21, and applies a voltage of-2V to electrode plate 20 and electrode plate 21 during period t 2. The effective value of the negative voltage applied to the electrode plates 20 and 21 in the period T2 is-2.87V, as shown in (b) of fig. 2. Accordingly, the effect of the electrostatic field generated by the voltages of the four periods t5 to t8 on the liquid crystal is the same as the effect of the electrostatic field generated by the voltage of 2.87V on the liquid crystal. Thus, the voltage Vrms of the electrostatic field applied to the liquid crystal molecules in one period T can be expressed by the following formula (1). Where V1 is the voltage of period t1 and Vn is the voltage of period tn. It is assumed that the period t1 to the period tn are all the same period.

As can be seen from the working principle of the liquid crystal display 200 and the formula (1) described above, in the liquid crystal driving device provided in the embodiment of the present application, different voltages are applied to the electrode plate 20 and the electrode plate 21 in a time period, so that the effective value of the voltage in the time period is a preset voltage value, and more voltage values can be further inserted based on the voltage separated by the voltage dividing resistor, thereby more deflection angles of liquid crystal molecules in the liquid crystal display 200 can be controlled, finer gray scale adjustment of the liquid crystal display 200 can be realized, and the improvement of the picture quality of the liquid crystal display 200 is facilitated. The liquid crystal driving device 100 provided in the embodiment of the present application will be described in more detail by way of the embodiments shown in fig. 3 to 7.

With continued reference to fig. 3, fig. 3 is a schematic diagram of a hardware structure of the liquid crystal driving device 100 according to the embodiment of the present application. The specific product configuration of the liquid crystal driving device 100 is as described above, and will not be described again. The liquid crystal driving apparatus 100 includes a liquid crystal driver 10 and one or more processors including, for example, a processor 11 shown in fig. 3. The processor 11 may be a central processing unit (CPU, central processing unit) or a microcontroller (MCU, microcontroller unit). Alternatively, the one or more processors may be integrated within one or more chips, which may be considered a chipset. In one specific example, the processor 11 may be integrated in a System On Chip (SOC) in which devices or components such as a cache may also be integrated. The liquid crystal driver 10 may be disposed outside the above-described SOC. In addition, the electronic apparatus 100 includes one or more other necessary components, such as a storage device 12 and a power management integrated circuit (power management integrated circuits, PMIC) 13. The processor 11 may have running therein software programs or software plug-ins such as operating system software and application software. The storage device 12 may have stored therein software programs or software plug-ins required for the processor 11 to operate. The power management integrated circuit 13 is configured to obtain power output from a power source (e.g., a battery or a household grid, etc.) to the processor 11 and the liquid crystal driver 10 to power the processor 11 and the liquid crystal driver 10. The processor 11 may send a driving control signal to the liquid crystal driver 10 after power-up, when the liquid crystal display 200 is lit, during video playback, or when a display screen is switched. The liquid crystal driver 10 converts the driving control signal into a plurality of sets of voltage signals, and transmits voltages of a plurality of different voltage values to the electrode plate 20 on the liquid crystal display 200 in the time period T. The time period T is a display refresh period of the liquid crystal display 200.

In the embodiment of the present application, the liquid crystal driver 10 may light the liquid crystal display 200 row by row or column by means of row scanning or column scanning, and the embodiment of the present application is described taking the row scanning as an example. In general, the electrode plates 20 of the lcd 200 are provided with pixel electrodes arranged in an array, as shown in fig. 4, and fig. 4 is a schematic structural diagram of the electrode plates 20 according to an embodiment of the present application. The liquid crystal driver 10 includes a plurality of data signal output terminals respectively coupled to the pixel electrodes of the plurality of columns shown in fig. 4, that is, one of the plurality of data signal output terminals is coupled to one of the pixel electrodes of the plurality of columns. The number of data signal output terminals in the liquid crystal driver 10 is the same as the number of pixel electrodes of each row on the electrode plate 20. The liquid crystal driver 10 is schematically shown in fig. 3 to include the 320 data signal outputs s1 to s320, and each row of the electrode plates 20 is schematically shown in fig. 4 to include the 320 pixel electrodes P1 to P320. It should be noted that, in the embodiment of the present application, the number of the data signal output terminals included in the liquid crystal driver 10 is not specifically limited, and is determined based on the number of the pixel electrodes in each row of the liquid crystal display. In addition, the liquid crystal driver 10 further includes a plurality of scan signal output terminals (not shown) for selecting a row of pixels, and the number of the scan signal output terminals may be the same as the number of pixel electrodes of each column in the liquid crystal display. The data signal output terminals s1 to s320 in the liquid crystal driver 10 are connected to the pixel electrodes on the electrode plate 20 through corresponding data signal lines, respectively. The liquid crystal driver 10 supplies voltages to each row of pixel electrodes through the data signal output terminals s1 to s320, respectively, based on the driving control signals transmitted from the processor 11 to control the deflection of liquid crystal molecules, thereby realizing the display of different gray scales. Wherein, different voltages are applied to the pixel electrodes, and the liquid crystal display screen presents different gray scales. Specifically, the liquid crystal driver 10 converts the drive control signal into a plurality of sets of voltage signals. At least two of the plurality of sets of voltage signals are different. Each of the plurality of sets of voltage signals includes a plurality of voltages, and the plurality of voltages corresponds to the pixels in the liquid crystal display 200 one by one. In addition, the liquid crystal driver 10 is further configured to output multiple sets of voltage signals to the pixel electrodes 20 in a time-sharing manner in the time period T, so as to control the gray scale of the pixel corresponding to each pixel electrode 20. The time period T is a display refresh period of the liquid crystal display. Each set of voltage signals is output for a period of time T. For a plurality of voltages in each set of voltage signals, each of the plurality of voltages is used to control a gray scale of a pixel corresponding to the voltage, respectively. For example, the liquid crystal driver 10 converts the driving signal sent by the processor 11 into three sets of voltage signals, i.e., a set of voltage signals N1, a set of voltage signals N2 and a set of voltage signals N3. Further, each set of voltage signals may further include 320 times 240=76800 (assuming electrode plate 20 shown in fig. 4 includes 320 pixel electrodes per row and 240 pixel electrodes per column) voltages. Thus, 76800 voltages included in the voltage signal N1 may be respectively supplied to each pixel electrode on the electrode plate 20 shown in fig. 4 for a period T1 within the time period T; 76800 voltages included in the voltage signal N2 may be respectively supplied to each pixel electrode on the electrode plate 20 shown in fig. 4 for a period T2 within the time period T; 76800 voltages included in the voltage signal N3 may be supplied to each pixel electrode on the electrode plate 20 shown in fig. 4, respectively, for a period T3 within the time period T. Thus, the set of voltage signals N1, the set of voltage signals N2 and the set of voltage signals N3 respectively apply voltages to each pixel electrode in different periods of time within the time period T to control the gray scale of the pixel corresponding to each pixel electrode. In one possible implementation, the voltage for a certain pixel a in the voltage signal N1 may be the same as the voltage for that pixel a in the voltage signal N2; the voltage for a certain pixel a in the voltage signal N1 may be different from the voltage for that pixel a in the voltage signal N3. In another possible implementation, the voltage for a certain pixel a in the voltage signal N1, the voltage for a certain pixel a in the voltage signal N2, and the voltage for a certain pixel a in the voltage signal N3 are different from each other. In the embodiment of the present application, the number of voltages applied to each pixel electrode and the number of gray scales displayed on the lcd are determined by the number of bits of the driving control signal outputted from the processor 11 and the number of different voltage values in one time period T.

The processor 11 may send a plurality of sets of driving control signals to the liquid crystal driver 10 in various scenes such as after power-up, when the liquid crystal display 200 is turned on, during video playing, or when a display screen is switched, based on a trigger of a user. For example, when the user triggers the liquid crystal display 200 to be turned on, the processor 11 may send a plurality of sets of driving control signals to the liquid crystal driver 10, and when the processor 11 receives an instruction to switch the display screen, the processor may send a plurality of sets of driving control signals to the liquid crystal driver 10 again. For another example, the processor 11 may transmit a plurality of sets of driving control signals to the liquid crystal driver 10 based on a preset frame rate during the video playing process by the user. For example, if the frame rate is 1/60s, the processor 11 transmits a plurality of sets of driving control signals to the liquid crystal driver 10 every 1/60 s. The multiple sets of driving control signals can control the voltages output by the data signal output terminals of the liquid crystal driver 10 in time periods T, which are display refresh periods of the liquid crystal display panel, to control the gray scale of each row of pixel electrodes on the electrode plate 20 as shown in fig. 4. Assuming that the processor 11 transmits four sets of driving control signals to the liquid crystal driver 10, the first set of driving control signals controls the voltage output by the data signal output terminal of the liquid crystal driver 10 in a period T1 within a time period T; a period T2 of the second set of driving control signals within the time period T, controls the voltage output from the data signal output terminal of the liquid crystal driver 10; a period T3 of the third set of driving control signals within the time period T, controls the voltage output from the data signal output terminal of the liquid crystal driver 10; the fourth set of driving control signals controls the voltage output from the data signal output terminal of the liquid crystal driver 10 in a period T4 within the time period T. At least two sets of drive control signals are different from each other among the sets of drive control signals transmitted by the processor 11. For example, the processor 11 transmits the two sets of driving control signals of the driving control signal a and the driving control signal B to the liquid crystal driver 10 at a time, and the two sets of driving control signals are different. In addition, each set of driving control signals may be divided into a plurality of control groups, and the number of control groups divided by the driving control signals is the same as the number of data signal transmission terminals of the liquid crystal driver 10 (i.e. the same as the number of pixel electrodes on one row of the electrode plates 20). Among the control groups, one of the control groups is used for controlling the voltage output by one of the data signal output terminals (i.e., controlling the gray level of one of the pixel electrodes). For example, if the electrode plate 20 shown in fig. 3 is provided with the 320 data signal outputs s1 to s320, one set of driving control signals may be divided into 320 control groups. Further, each control group may further include a plurality of bit signals for controlling each data signal output terminal to output a specific voltage value. Assuming that each control group includes a 6-bit signal, each control group may control each data signal output terminal of the liquid crystal driver 10 to output voltages of 64 different voltage values. For example, "000000" represents an output voltage of 0V, and "000001" represents an output voltage of 0.1V. Thus, the processor 11 may cause the liquid crystal driver 10 to apply voltages of different magnitudes to the pixels on the electrode plate 20 during the time period T by transmitting different driving control signals to the liquid crystal driver 10, so that the liquid crystal molecules are deflected based on the effective voltage of the time period T, and further more gray values may be generated. For example, assuming that each control group includes a 6-bit signal, the processor 11 transmits a set of driving control signals to drive the liquid crystal molecules to deflect in one period of time T, a 64-bit gray value may be generated; when the processor 11 sends two sets of different driving control signals to drive the liquid crystal molecules to deflect in a time period T, a 64×2-1=127 bit gray value can be generated, and compared with the 6 bit signal, the driving signal with one bit precision is increased in a time period T; when four different sets of driving control signals are sent to drive the liquid crystal molecules to deflect in one time period T, the processor 11 can generate a gray scale value of 64×4-1=255 bits, which corresponds to a driving signal with two bits of accuracy increased in one time period T compared with the above-mentioned 6-bit signal. It should be noted that, in the embodiment of the present application, the number of groups of the processor 11 sending the driving control signals may be set based on the display requirement of the liquid crystal display screen to drive the liquid crystal molecules to deflect in each time period T, which is not specifically limited in the embodiment of the present application. When the display is required to be finer, then one time period T may transmit more sets of different drive control signals.

Based on the operation principle of the processor 11 and the liquid crystal driver 10 as described above, a specific structure of the liquid crystal driver 10 is shown in fig. 5. In fig. 5, the liquid crystal driver 10 includes a digital-to-analog converter 101, a memory 102, a timing controller 103, and an interface 104. The interface 104 may be, for example, a serial peripheral interface (serial peripheral interface, SPI). The liquid crystal driver 10 is coupled to the processor 11 through an interface 104 for signal transmission. The memory 102 is coupled to the interface 104 and the digital-to-analog converter 101, respectively, and the timing controller 103 is also coupled to the digital-to-analog converter 101. The processor 11 writes the above-described sets of drive control signals into the memory 102 via the interface 104. The digital-to-analog converter 101 reads the drive control signal from the memory 102 based on the clock signal generated by the timing controller 103; and converting the read driving control signal into an analog voltage signal, and transmitting the voltage signal to the pixel electrode on the electrode plate 20 through the control signal output terminals s1 to s 320. In particular, the clock period of the timing controller 103 is preset based on the accuracy of the gray scale to be generated by the liquid crystal display 200 and the display refresh period T of the liquid crystal display 200. Taking the example that each control group includes a 6-bit signal, if a 127-bit gray value needs to be generated, the clock period of the timing controller 103 may be 2/T; if a gray value of 255 bits needs to be generated, the clock period of the timing controller 103 may be 4/T. Thus, the digital-to-analog converter 101 reads the drive control signal from the memory 102 at the start timing of each clock cycle, and converts the read drive control signal 102 into a voltage signal. In addition, the timing controller 103 may be provided with a means for controlling the polarity inversion of the voltage in advance. In this embodiment of the present application, the voltage polarity inversion mode may be set by various methods such as a dot driving mode (i.e., voltages of different polarities are applied to adjacent pixel electrodes in the same time period T), a column driving mode (i.e., voltages of different polarities are applied to adjacent pixel electrodes in the same time period T), a row driving mode (i.e., voltages of different polarities are applied to adjacent pixel electrodes in the same time period T), or a frame driving mode (i.e., voltages of positive polarity are applied to all pixel electrodes in the first time period T and voltages of negative polarity are applied to all pixel electrodes in the second time period T). The following describes an example of a frame driving method. Assuming that the clock in the liquid crystal display 200 holds the picture of the presentation frame f1, the processor 11 stores two sets of driving control signals for presenting the picture of the frame f1 in advance in the memory 102 through the interface 104. The liquid crystal driver 10 converts the two sets of driving control signals into positive polarity voltage signals in a first time period T, supplies the positive polarity voltage signals to the pixel electrodes on the electrode plate 20, and converts the two sets of driving control signals into negative polarity voltage signals in a second time period T, sequentially reciprocating until the screen is extinguished or the next driving control signal arrives, based on the timing supplied from the timing controller 103. Assuming that video is currently being played in the lcd 200, the processor 11 may store two sets of driving control signals for each frame of picture to the memory 102 through the interface 104 based on a preset frame rate. The liquid crystal driver 10 reads a set of driving control signals at the previous T/2 in the first time period T based on the clock signal supplied from the timing controller 103, and converts the set of driving control signals into positive polarity voltage signals to supply to the pixel electrodes; reading a set of driving control signals at a rear T/2 in a first time period T, and converting the set of driving control signals into positive polarity voltage signals to be supplied to the pixel electrodes; reading a set of driving control signals at the first T/2 in the second time period T, and converting the set of driving control signals into negative polarity voltage signals to be supplied to the pixel electrode; and reading a group of driving control signals after T/2 in the second time period T, converting the group of driving control signals into negative polarity voltage signals and providing the negative polarity voltage signals to the pixel electrodes, and sequentially reciprocating until video playing is completed. In addition, the liquid crystal driver 10 may further include more components. For example, a dc-dc converter 105 connected to the power management integrated circuit 13 on the liquid crystal driving device 100. The dc-dc converter 105 includes, for example, but is not limited to, a Buck converter, a Boost converter, a Buck-Boost converter, or the like. The dc-dc converter 105 is used to convert the dc power provided by the power management integrated circuit 13 into a voltage and current suitable for the operation of the digital-to-analog converter 101 to power the digital-to-analog converter 101.

Based on the structure of the liquid crystal driver 10 shown in fig. 5, the specific structure of the digital-to-analog converter 101 in the liquid crystal driver 10 may be as shown in fig. 6. In fig. 6, the digital-to-analog converter 101 includes a plurality of voltage dividing resistors connected in series between the power supply terminal Vdd and the common ground Gnd, and a plurality of signal output channels. A node is provided between each two of the plurality of voltage dividing resistors for dividing voltage. Wherein the number of voltage dividing resistors is determined based on the number of bits included in one control group in the driving control signal. Fig. 6 schematically shows that 65 voltage dividing resistors (five voltage dividing resistors are shown as resistors r1, r2, r3, r64 and r65 in fig. 6) are connected in series between the power supply terminal Vdd and the common ground Gnd, that is, 64-bit voltages can be divided, and one control group in the corresponding driving control signals includes 6-bit signals. The number of signal output channels is the same as the number of pixels of each row on the electrode plate 20, and a plurality of signal output channels output a specific voltage to the pixels on the electrode plate 20 through corresponding data signal output terminals. For example, the liquid crystal driver 10 shown in fig. 3 includes 320 data signal outputs, and the liquid crystal driver 10 may include 320 signal output channels. Each of the plurality of signal output channels includes a multiplexer M and a buffer F, each multiplexer M includes a plurality of input terminals, the number of the plurality of input terminals is the same as the number of bits of the voltage that can be split by the voltage dividing resistor, each multiplexer M shown in fig. 6 may be a selector selected by 64, and the plurality of input terminals of the multiplexer M are respectively coupled to the voltage dividing nodes; the output terminal of the multiplexer M is coupled to the data signal output terminal of the liquid crystal driver 10 through the buffer F. In addition, the output of the dc-dc converter shown in fig. 4 is coupled to the power supply terminal Vdd to supply power to Vdd. The buffer F may be a follower, with the output of the multiplexer M coupled to the non-inverting input of the buffer F and the inverting input of the buffer F coupled to the output. In the digital-to-analog converter 101 shown in fig. 5, each of the multiplexers M further includes a control terminal co for inputting a driving control signal; thus, the multiplexer M selects one of the plurality of inputs to be connected to the output, i.e., selects a certain voltage value. The control terminal co of each multiplexer is coupled to the memory 102 shown in fig. 5 through a bus to obtain the driving control signal from the memory 102.

Based on the structure of the liquid crystal driving device 100 as described above, the embodiment of the present application also provides a liquid crystal driving method 700, and the liquid crystal driving method 700 is applied to the liquid crystal driving device 100 as shown in fig. 3. The liquid crystal driving method 700 specifically includes the steps of: in step 701, the processor 11 sends a first driving control signal to the liquid crystal driver 10. Step 702, the liquid crystal driver 10 converts the first driving control signal into a plurality of sets of first voltage signals, where each set of first voltage signals includes a plurality of first voltages, and the plurality of first voltages are in one-to-one correspondence with a plurality of pixels in the liquid crystal display; and outputting the multiple groups of first voltage signals to multiple electrodes of the multiple pixels in a time-sharing mode in a first preset time period so as to control the gray scale of the multiple pixels. The first voltage signals of each group are respectively output in a period of time within the first preset time period, each first voltage of the plurality of first voltages is respectively used for controlling the gray scale of a pixel corresponding to the first voltage, and at least two groups of first voltage signals of the plurality of groups of first voltage signals are different.

In one possible implementation, the first drive control signals include multiple sets of first drive control signals; the liquid crystal driver 10 converts the first driving control signal into a plurality of sets of first voltage signals, including: the liquid crystal driver 10 converts each of the plurality of sets of first driving control signals into a set of first voltage signals.

In one possible implementation, the processor 11 sends a first driving control signal to the liquid crystal driver 10, including: after the liquid crystal driving device 100 is powered on, when the liquid crystal display 200 is turned on, during video playing, or when the display screen is switched, the plurality of sets of first driving control signals are stored in the memory 102 in the liquid crystal driver 10.

In one possible implementation, the liquid crystal driver 10 converts the first driving control signal into a plurality of sets of first voltage signals, including: the liquid crystal driver 10 reads the plurality of sets of first driving control signals from the memory 102 in a time-sharing manner within the first preset time period based on the clock signal generated by the timing controller 103 in the liquid crystal driver 10, and converts the plurality of sets of first driving control signals into the plurality of sets of first voltage signals; wherein the first preset time period comprises a plurality of clock periods of the clock signal.

In one possible implementation, the plurality of first voltages are positive polarity voltage signals during the first preset time period; the method further comprises the steps of: the processor 11 transmits a second driving control signal to the liquid crystal driver 10; the liquid crystal driver 10 converts the second driving control signal into a plurality of sets of second voltage signals, wherein each set of second voltage signals in the plurality of sets of second voltage signals comprises a plurality of second voltages, and the plurality of second voltages are in one-to-one correspondence with the plurality of pixels; outputting the multiple groups of second voltage signals to the multiple electrodes in a time-sharing mode within a second preset time period; wherein each set of second voltage signals is output within a period of time within the second preset time period, each second voltage in the plurality of second voltages is used for controlling the gray scale of the pixel corresponding to the second voltage, and at least two sets of second voltage signals in the plurality of sets of second voltage signals are different; the plurality of second voltages are negative polarity voltage signals during the second preset time period.

In one possible implementation, the at least two sets of first voltage signals include a first set of first voltage signals and a second set of first voltage signals; the first voltage for a pixel in the first set of first voltage signals is different from the first voltage for the pixel in the second set of first voltage signals.

In one possible implementation, the first voltage for a pixel in any one of the at least two sets of first voltage signals is different from the first voltage for the pixel in any other one of the at least two sets of first voltage signals.

In one possible implementation, the first preset time period is a display refresh period of the liquid crystal display screen.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (17)

1. A liquid crystal driving device, comprising a processor and a liquid crystal driver;

   the processor is used for sending a first driving control signal to the liquid crystal driver;

   The liquid crystal driver is used for converting the first driving control signals into a plurality of groups of first voltage signals, wherein each group of first voltage signals in the plurality of groups of first voltage signals comprises a plurality of first voltages, and the plurality of first voltages are in one-to-one correspondence with a plurality of pixels in the liquid crystal display screen; outputting the multiple groups of first voltage signals to multiple electrodes of the multiple pixels in a time-sharing mode in a first preset time period so as to control the gray scale of the multiple pixels;

   the first voltage signals of each group are respectively output in a period of time within the first preset time period, each first voltage of the plurality of first voltages is respectively used for controlling the gray scale of a pixel corresponding to the first voltage, and at least two groups of first voltage signals of the plurality of groups of first voltage signals are different.
2. The liquid crystal driving apparatus according to claim 1, wherein the first driving control signals include a plurality of sets of first driving control signals; the liquid crystal driver comprises a digital-to-analog conversion circuit;

   the digital-to-analog conversion circuit is used for converting each group of first driving control signals in the plurality of groups of first driving control signals into a group of first voltage signals.
3. The liquid crystal driving apparatus according to claim 2, wherein the liquid crystal driver further comprises a memory; the processor is specifically configured to:

   and after the liquid crystal driving device is powered on, when the liquid crystal display screen is lightened, during video playing or when a display picture is switched, storing the plurality of groups of first driving control signals into the memory.
4. A liquid crystal driving apparatus according to claim 3, wherein the liquid crystal driver further comprises a timing controller for generating a clock signal, the first preset time period comprising a plurality of clock cycles of the clock signal;

   the liquid crystal driver is specifically for: based on the clock signal, the plurality of sets of first drive control signals are read from the memory in a time-sharing manner for the first preset time period, and the plurality of sets of first drive control signals are converted into the plurality of sets of first voltage signals.
5. A liquid crystal driving apparatus according to claim 3 or 4, wherein,

   the plurality of first voltages are positive polarity voltage signals for the first preset time period;

   the processor is further used for sending a second driving control signal to the liquid crystal driver;

   The liquid crystal driver is further configured to convert the second driving control signal into a plurality of groups of second voltage signals, where each group of second voltage signals in the plurality of groups of second voltage signals includes a plurality of second voltages, and the plurality of second voltages are in one-to-one correspondence with the plurality of pixels; outputting the multiple groups of second voltage signals to the multiple electrodes in a time-sharing mode within a second preset time period; wherein each set of second voltage signals is output within a period of time within the second preset time period, each second voltage in the plurality of second voltages is used for controlling the gray scale of the pixel corresponding to the second voltage, and at least two sets of second voltage signals in the plurality of sets of second voltage signals are different;

   the plurality of second voltages are negative polarity voltage signals during the second preset time period.
6. The liquid crystal driving apparatus according to any one of claims 1 to 5, wherein the at least two sets of first voltage signals include a first set of first voltage signals and a second set of first voltage signals;

   the first voltage for a pixel in the first set of first voltage signals is different from the first voltage for the pixel in the second set of first voltage signals.
7. The liquid crystal driving device according to any one of claims 1 to 6, wherein a first voltage for one pixel in any one of the at least two sets of first voltage signals is different from a first voltage for the pixel in any other one of the at least two sets of first voltage signals.
8. The liquid crystal driving apparatus according to any one of claims 1 to 7, wherein the liquid crystal driving apparatus further comprises the liquid crystal display panel.
9. The liquid crystal driving apparatus according to any one of claims 1 to 8, wherein the first preset time period is a display refresh period of the liquid crystal display.
10. A method for driving a liquid crystal, the method comprising:

    a processor in a liquid crystal driving device sends a first driving control signal to the liquid crystal driver;

    the liquid crystal driver in the liquid crystal driving device converts the first driving control signals into a plurality of groups of first voltage signals, wherein each group of first voltage signals in the plurality of groups of first voltage signals comprises a plurality of first voltages, and the plurality of first voltages are in one-to-one correspondence with a plurality of pixels in the liquid crystal display screen; outputting the multiple groups of first voltage signals to multiple electrodes of the multiple pixels in a time-sharing mode in a first preset time period so as to control the gray scale of the multiple pixels;

    The first voltage signals of each group are respectively output in a period of time within the first preset time period, each first voltage of the plurality of first voltages is respectively used for controlling the gray scale of a pixel corresponding to the first voltage, and at least two groups of first voltage signals of the plurality of groups of first voltage signals are different.
11. The method of claim 10, wherein the first drive control signals comprise a plurality of sets of first drive control signals; the liquid crystal driver in the liquid crystal driving device converts the first driving control signal into a plurality of sets of first voltage signals, including:

    the liquid crystal driver converts each of the plurality of sets of first driving control signals into a set of first voltage signals.
12. The method of claim 11, wherein the processor in the liquid crystal drive device sends a first drive control signal to the liquid crystal driver, comprising:

    and after the liquid crystal driving device is powered on, when the liquid crystal display screen is lightened, during video playing or when a display picture is switched, storing the plurality of groups of first driving control signals into a memory in the liquid crystal driver.
13. The method of claim 12, wherein the liquid crystal driver in the liquid crystal driving apparatus converts the first driving control signal into a plurality of sets of first voltage signals, comprising:

    the liquid crystal driver reads the plurality of groups of first driving control signals from the memory in a time-sharing manner within the first preset time period based on a clock signal generated by a timing controller in the liquid crystal driver, and converts the plurality of groups of first driving control signals into the plurality of groups of first voltage signals;

    wherein the first preset time period comprises a plurality of clock periods of the clock signal.
14. The method of claim 12 or 13, wherein the plurality of first voltages are positive polarity voltage signals during the first preset time period; the method further comprises the steps of:

    the processor sends a second drive control signal to the liquid crystal driver;

    the liquid crystal driver converts the second driving control signal into a plurality of groups of second voltage signals, wherein each group of second voltage signals in the plurality of groups of second voltage signals comprises a plurality of second voltages, and the plurality of second voltages are in one-to-one correspondence with the plurality of pixels; outputting the multiple groups of second voltage signals to the multiple electrodes in a time-sharing mode within a second preset time period; wherein each set of second voltage signals is output within a period of time within the second preset time period, each second voltage in the plurality of second voltages is used for controlling the gray scale of the pixel corresponding to the second voltage, and at least two sets of second voltage signals in the plurality of sets of second voltage signals are different;

    The plurality of second voltages are negative polarity voltage signals during the second preset time period.
15. The method of any one of claims 10-14, wherein the at least two sets of first voltage signals comprise a first set of first voltage signals and a second set of first voltage signals;

    the first voltage for a pixel in the first set of first voltage signals is different from the first voltage for the pixel in the second set of first voltage signals.
16. A method according to any of claims 10-15, wherein the first voltage for a pixel in any of the at least two sets of first voltage signals is different from the first voltage for the pixel in any of the other at least two sets of first voltage signals.
17. The method of any of claims 10-16, wherein the first predetermined time period is a display refresh period of the liquid crystal display.