Cholesteric liquid crystal display apparatus and driving method therefor

Abstract

Provided in the present disclosure are a cholesteric liquid crystal display apparatus and a driving method therefor. The cholesteric liquid crystal display apparatus includes a cholesteric liquid crystal display panel, a timing control module and a driving module, wherein the timing control module is configured to output an enable signal and a latch signal; and the enable signal is used for controlling the driving module to stop outputting a driving voltage, and the latch signal is used for controlling the driving module to discharge the driving voltage to zero volts. Therefore, the power consumption of the cholesteric liquid crystal display apparatus is reduced. (FIG. 1)

Description

Cholesteric liquid crystal display device and driving method thereof TECHNICAL FIELD

[0001] The present disclosure relates to a display device and a driving method thereof, and particularly relates to a cholesteric liquid crystal display device and a driving method thereof. BACKGROUND

[0002] Cholesteric liquid crystal (ChLCD) has bistable characteristics, one of which is a planar state and the other of which is a focal conic state. A cholesteric liquid crystal display device can maintain a display screen without providing power after the display screen is finished.

[0003] However, the largest power consumption of the cholesteric liquid crystal display device is related to the polarity change of the driving voltage, which causes the cholesteric liquid crystal display device to fail to achieve the goal of cost optimization.

[0004] Therefore, there is a lack of a cholesteric liquid crystal display device and a driving method thereof capable of reducing the power consumption of the driving voltage polarity change in the market, and relevant manufacturers are seeking solutions.

[0005] SUMMARY

[0006] The purpose of the present disclosure is to provide a cholesteric liquid crystal display device and a driving method thereof, which can greatly reduce the power consumption of the cholesteric liquid crystal display panel and effectively achieve the goal of cost optimization by discharging the driving voltage to zero volts when the polarity of the driving voltage is changed.

[0007] According to an embodiment of the structural form of the present disclosure, a cholesteric liquid crystal display device is provided, comprising a cholesteric liquid crystal display panel, a timing control module, and a driving module. The cholesteric liquid crystal display panel comprises a plurality of row electrodes and a plurality of column electrodes. The column electrodes are perpendicular to the row electrodes and form a plurality of pixels with the row electrodes. The timing control module is used to output an enable signal and a latch signal. The driving module is electrically connected to the timing control module and the cholesteric liquid crystal display panel, and is used to receive the enable signal and the latch signal to output a driving voltage to each corresponding pixel. The driving voltage output by the driving module reaches a target voltage value corresponding to an image data from an initial voltage value, the enable signal is used to control the driving module to stop outputting the driving voltage, and the latch signal is used to control the driving module to discharge the driving voltage to zero volts.

[0008] Other embodiments of the foregoing embodiment are as follows: The latch signal is further used to control the driving module to latch the image data and output the driving voltage.

[0009] Other implementations of the aforementioned embodiment are as follows: the driving module latches the image data when the latch signal is in the high level stage. The driving module outputs the driving voltage to the cholesteric liquid crystal display panel when the latch signal is in the low level stage.

[0010] Other implementations of the aforementioned embodiment are as follows: the driving module makes the driving voltage reach the target voltage value from the initial voltage value when the latch signal is in the high level stage.

[0011] Other implementations of the aforementioned embodiment are as follows: the driving module further outputs a zero voltage when the latch signal is in the high level stage, so that the driving voltage is discharged from the initial voltage value to zero voltage. The driving module makes the driving voltage reach the target voltage value from zero voltage when the latch signal is in the low level stage.

[0012] Other implementations of the aforementioned embodiment are as follows: the driving module outputs the driving voltage discharged from the initial voltage value to zero voltage, and then makes the driving voltage reach the target voltage value from zero voltage when zero voltage is between the initial voltage value and the target voltage value.

[0013] Other implementations of the aforementioned embodiment are as follows: the driving module outputs the driving voltage to the cholesteric liquid crystal display panel when the enable signal outputted by the timing control module is in the high level stage. The driving module stops outputting the driving voltage when the enable signal outputted by the timing control module is in the low level stage.

[0014] Other implementations of the aforementioned embodiment are as follows: the timing control module further outputs a zero voltage enable signal. The driving module makes the driving voltage outputted to each pixel discharged from the initial voltage value to zero voltage when the enable signal and the zero voltage enable signal outputted by the timing control module are both in the high level stage. The driving module makes the driving voltage reach the target voltage value when the enable signal outputted by the timing control module is in the high level stage and the zero voltage enable signal is in the low level stage.

[0015] Other implementations of the aforementioned embodiment are as follows: the driving voltage comprises a plurality of scan driving voltages and a plurality of data driving voltages. The driving module further outputs the scan driving voltages to the row electrodes respectively, and outputs the data driving voltages to the column electrodes respectively.

[0016] Other implementations of the aforementioned embodiment are as follows: the driving module comprises a row driver and a column driver. The row driver is electrically connected to the row electrodes and is used to output the scan driving voltages. The column driver is electrically connected to the column electrodes and is used to output the data driving voltages.

[0017] One embodiment of the method aspect of the present disclosure provides a driving method of a cholesteric liquid crystal display device. The cholesteric liquid crystal display device includes a cholesteric liquid crystal display panel, a timing control module and a driving module. The cholesteric liquid crystal display panel includes a plurality of pixels. The driving method of the cholesteric liquid crystal display device includes: determining, by the driving module, whether a driving voltage is changed in polarity. Outputting, by the timing control module, an enable signal and a latch signal. The enable signal is used to control the driving module to stop outputting the driving voltage. The latch signal is used to control the driving module to discharge the driving voltage to zero volt. Receiving, by the driving module, the enable signal and the latch signal to output the driving voltage to each pixel of the cholesteric liquid crystal display panel corresponding to the pixel respectively. The driving voltage outputted by the driving module is from an initial voltage value to a target voltage value corresponding to an image data.

[0018] Other implementations of the aforementioned embodiment include the following. The latch signal is further used to control the driving module to latch the image data and output the driving voltage.

[0019] Other implementations of the aforementioned embodiment include the following. When the latch signal is in a high level stage, the driving module latches the image data. When the latch signal is in a low level stage, the driving module outputs the driving voltage to the cholesteric liquid crystal display panel.

[0020] Other implementations of the aforementioned embodiment include the following. The driving module discharges the driving voltage from the initial voltage value to the target voltage value when the latch signal is in the high level stage.

[0021] Other implementations of the aforementioned embodiment include the following. The driving method of the cholesteric liquid crystal display device further includes: outputting, by the driving module, a zero volt voltage to discharge the driving voltage from the initial voltage value to zero volt when the driving voltage is changed in polarity and the latch signal is in the high level stage. Outputting the driving voltage from zero volt to the target voltage value when the latch signal is in the low level stage.

[0022] Other implementations of the aforementioned embodiment include the following. When zero volt is between the initial voltage value and the target voltage value, the driving voltage outputted by the driving module is discharged from the initial voltage value to zero volt and continues to be from zero volt to the target voltage value.

[0023] Other implementations of the aforementioned embodiment include the following. When the enable signal is in a high level stage, the driving module outputs the driving voltage to the cholesteric liquid crystal display panel. When the enable signal is in a low level stage, the driving module stops outputting the driving voltage.

[0024] Other implementations of the foregoing embodiments include the following. The driving method of the cholesterol liquid crystal display device further comprises outputting a zero voltage enable signal by the timing control module. When the enable signal and the zero voltage enable signal output by the timing control module are both in a high level stage, the driving module causes the driving voltage output to each pixel to discharge from an initial voltage value to zero volts. When the enable signal output by the timing control module is in a high level stage and the zero voltage enable signal is in a low level stage, the driving module causes the driving voltage to reach a target voltage value. BRIEF DESCRIPTION OF DRAWINGS

[0025] FIG. 1 is a block schematic diagram of a cholesterol liquid crystal display device according to a first embodiment of the present disclosure;

[0026] FIG. 2 is a timing diagram showing the latch signal of the timing control module and the driving voltage of the driving module in FIG. 1;

[0027] FIG. 3A is a current timing diagram showing that a conventional cholesterol liquid crystal display panel does not discharge to zero volts in the case of polarity change of the driving voltage;

[0028] FIG. 3B is a current timing diagram showing that the cholesterol liquid crystal display panel according to FIG. 1 discharges to zero volts in the case of polarity change of the driving voltage;

[0029] FIG. 4 is a control logic diagram showing the enable signal and the zero voltage enable signal of the timing control module in FIG. 1; and

[0030] FIG. 5 is a flowchart showing a driving method of a cholesterol liquid crystal display device according to a second embodiment of the present disclosure.

[0031] REFERENCE NUMERALS:

[0032] 100: cholesterol liquid crystal display device

[0033] 110: cholesterol liquid crystal display panel

[0034] 111: row electrode

[0035] 112: column electrode

[0036] 120: timing control module

[0037] 130: driving module

[0038] 131: row driver

[0039] 132: column driver

[0040] 200: driving method of cholesterol liquid crystal display device

[0041] CLK: clock signal

[0042] Data: image data

[0043] DIO: data output input signal

[0044] S01, S02, S03: step

[0045] SDOE: enable signal

[0046] SDOZ: zero voltage enable signal

[0047] STB: latch signal

[0048] VD, VD1, VD2, VD3, VD4, VDa, VDb: driving voltage

[0049] VN1, VN2, VN3, VP1, VP2, VP3: voltage DETAILED DESCRIPTION

[0050] Several embodiments of the present disclosure will be explained with reference to the drawings hereafter. For the purpose of explanation, numerous specific details will be set forth in the description hereafter. It should be appreciated however that these specific details are not to be interpreted as limiting the present disclosure. That is, in some embodiments of the present disclosure, such specific details can not be necessary. Further, for the purpose of simplicity and clarity, some well-known structures and elements are not described in detail hereinafter. Moreover, the same reference numerals will be used throughout the drawings and the description to indicate the same or similar components.

[0051] Further, when an element (or unit or module etc.) is "connected" to another element, it can mean that the element is directly connected to the other element or indirectly connected to the other element, i.e., there are other elements between the element and the other element. When it is explicitly stated that an element is "directly connected" to another element, it means that there is no other element between the element and the other element. The terms first, second, third, etc. are used to describe various elements, and do not limit the elements themselves. Thus, a first element can also be referred to as a second element. Further, the combination of elements / units / circuits herein is not a combination of elements / units / circuits generally known in the art, and it cannot be determined whether the combination of elements / units / circuits is easily completed by those skilled in the art based on whether the elements / units / circuits are existing.

[0052] Referring to FIG. 1, which is a block diagram illustrating a cholesterol liquid crystal display device according to a first embodiment of the present disclosure. The cholesterol liquid crystal display device 100 includes a cholesterol liquid crystal display panel 110, a timing control module 120, and a driving module 130. The driving module 130 is electrically connected to the cholesterol liquid crystal display panel 110 and the timing control module 120. The cholesterol liquid crystal display panel 110 includes a plurality of row electrodes 111 and a plurality of column electrodes 112, which are perpendicular to the row electrodes 111 and form a plurality of pixels with the row electrodes 111.

[0053] The timing control module 120 is configured to output a plurality of control signals to the driving module 130 to control the driving module 130. The driving module 130 is configured to receive the control signals and output a driving voltage VD to a corresponding pixel to cause the cholesterol liquid crystal display panel 110 to display an image. The driving voltage VD includes a plurality of scanning driving voltages and a plurality of data driving voltages, and the driving module 130 is configured to output the scanning driving voltages to the row electrodes 111 and output the data driving voltages to the column electrodes 112, respectively. The driving module 130 includes a row driver 131 and a column driver 132. The row driver 131 is electrically connected to the row electrodes 111 and is configured to output the scanning driving voltages. The column driver 132 is electrically connected to the column electrodes 112 and is configured to output the data driving voltages.

[0054] Referring to FIG. 1, the control signals output by the timing control module 120 include an image data Data, an enable signal SDOE, and a latch signal STB. The image data Data is image data to be displayed by the cholesterol liquid crystal display panel 110. The enable signal SDOE is configured to control the driving module 130 to stop outputting the driving voltage VD. The latch signal STB is configured to control the driving module 130 to discharge the driving voltage VD to zero volts. The driving voltage VD output by the driving module 130 is from an initial voltage value to a target voltage value corresponding to the image data Data. In addition, the control signals output by the timing control module 120 further include a zero voltage enable signal SDOZ, a data output input indication signal DIO, and a clock signal CLK. The zero voltage enable signal SDOZ is configured to control the driving module 130 to discharge the driving voltage VD output by the cholesterol liquid crystal display panel 110 to zero volts. The data output input indication signal DIO is configured to control the driving module 130 to output time information of data reception or data transmission. The clock signal CLK is configured to acquire data to the column driver 132.

[0055] Referring to FIG. 1 and FIG. 2, wherein FIG. 2 is a timing diagram showing the timing of the latch signal STB outputted from the timing control module 120 and the driving voltage VD outputted from the driving module 130. The latch signal STB is used to control the row driver 131 of the driving module 130 to latch the image data Data and output the driving voltage VD. When the latch signal STB outputted from the timing control module 120 is at a high level, the row driver 131 of the driving module 130 latches the image data Data; and when the latch signal STB is at a low level, the row driver 131 of the driving module 130 outputs the driving voltage VD to the cholesteric liquid crystal display panel 110.

[0056] In detail, when the latch signal STB is at a high level, the driving module 130 does not output the driving voltage VD to the cholesteric liquid crystal display panel 110, but only latches the image data Data, and at the same time, makes the driving voltage VD from an initial voltage value to a target voltage value.

[0057] In addition, when the polarity of the driving voltage VD is changed, at the high level of the latch signal STB, the driving module 130 outputs a zero voltage, so that the driving voltage VD is discharged from the initial voltage value to zero voltage, and continues to make the driving voltage VD from zero voltage to the target voltage value and output at the low level of the latch signal STB.

[0058] It should be noted that when zero voltage is between the initial voltage value and the target voltage value of the driving voltage VD, which represents the polarity change of the driving voltage VD (from positive voltage to negative voltage or from negative voltage to positive voltage), the timing control module 120 outputs the latch signal STB at a high level, so that the driving voltage VD outputted from the driving module 130 is first discharged from the initial voltage value to zero voltage, and then continues to reach the target voltage value from zero voltage.

[0059] Therefore, in the case of polarity change of the driving voltage VD, the driving voltage VD is first discharged to zero voltage by the latch signal STB, which can greatly reduce the power consumption of the cholesteric liquid crystal display panel 110.

[0060] For example, in FIG. 2, the driving voltages VD1 and VD2 are changed in polarity, and the driving voltages VD3 and VD4 are not changed in polarity. The initial voltage value of the driving voltage VD1 is voltage VP2, and the target voltage value is voltage VN3. The driving module 130 outputs a zero voltage at the high level of the latch signal STB, so that the driving voltage VD is discharged from voltage VP2 to zero voltage, and then at the low level of the latch signal STB, the driving voltage VD reaches voltage VN3 from zero voltage and is outputted to the cholesteric liquid crystal display panel 110 (not shown in FIG. 2).

[0061] The initial voltage value of the driving voltage VD2 is voltage VN2, and the target voltage value is voltage VP1. When the latch signal STB is at the high level, the driving module 130 outputs zero volt, and the driving voltage VD is discharged from voltage VN2 to zero volt. Then, when the latch signal STB is at the low level, the driving voltage VD is from zero volt to voltage VP1, and the output is sent to the cholesteric liquid crystal display panel 110 (not shown in FIG. 2).

[0062] The initial voltage value of the driving voltage VD3 is voltage VP3, and the target voltage value is voltage VP1. When the latch signal STB is at the high level, the driving module 130 directly outputs voltage VP1 from voltage VP3 to voltage VP1. Then, when the latch signal STB is at the low level, the output is sent to the cholesteric liquid crystal display panel 110 (not shown in FIG. 2).

[0063] The initial voltage value of the driving voltage VD4 is voltage VN2, and the target voltage value is voltage VN1. When the latch signal STB is at the high level, the driving module 130 directly outputs voltage VN1 from voltage VN2 to voltage VN1. Then, when the latch signal STB is at the low level, the output is sent to the cholesteric liquid crystal display panel 110 (not shown in FIG. 2).

[0064] Referring to FIGS. 1, 3A and 3B, FIG. 3A is a current timing diagram of a conventional cholesteric liquid crystal display panel without discharging to zero volt in the case of polarity change of driving voltage, and FIG. 3B is a current timing diagram of the cholesteric liquid crystal display panel according to FIG. 1 with discharging to zero volt in the case of polarity change of driving voltage. In FIG. 3A, the driving voltage VDa is in the case of polarity change without discharging to zero volt, and in FIG. 3B, the driving voltage VDb is in the case of polarity change with discharging to zero volt. The current i is the peak current generated by the cholesteric liquid crystal display panel 110 in the case of polarity change, and the calculation formula of the current i is i = Cdv / dt, wherein C is the load of the pixel of the cholesteric liquid crystal display panel 110, dv is the value of the change of the pixel voltage, and dt is the time of conversion. The initial voltage value of the driving voltage VDa and VDb is voltage VN3, and the target voltage value is voltage VP3.

[0065] In FIG. 3A, because the driving voltage VDa is not discharged to zero volt when the latch signal STB is at the high level, the change of the pixel voltage is the target voltage value minus the initial voltage value (dv = VP3 - VN3). In FIG. 3B, the driving voltage VDb is discharged to zero volt when the latch signal STB is at the high level, and the change of the pixel voltage is the target voltage value minus zero volt (dv = VP3 - 0 = VP3). Therefore, the current i of the driving voltage VDb is obviously reduced compared with the current i of the driving voltage VDa. Thus, the power consumption of the cholesteric liquid crystal display panel 110 can be greatly reduced.

[0066] Referring to FIG. 1 and FIG. 4, FIG. 4 is a control logic diagram showing the enable signal and the zero-voltage enable signal of the timing control module in FIG. 1. When the enable signal SDOE outputted by the timing control module 120 is in the high level stage, the driving module 130 outputs the driving voltage VD to the cholesteric liquid crystal display panel 110; and when the enable signal SDOE is in the low level stage, the driving module 130 outputs high impedance and stops outputting the driving voltage VD (as the dashed line segment in FIG. 4). When the zero-voltage enable signal SDOZ outputted by the timing control module 120 is in the high level stage, the driving module 130 discharges the driving voltage VD from the initial voltage value to zero volt; and when the zero-voltage enable signal SDOZ is in the low level stage, the driving module 130 makes the driving voltage VD reach the target voltage value from the initial voltage value.

[0067] Further explanation, the procedure of cholesteric liquid crystal driving includes four stages: reset, interval, display and end. The reset stage is to clear the previous display screen and drive the cholesteric liquid crystal into the homeotropic state, the interval stage is to drive the cholesteric liquid crystal into the reflective state, the display stage is to display the next screen, and the end stage is to end the display. The zero-voltage enable signal SDOZ mainly acts in the interval stage and the end stage.

[0068] In addition, it needs to be particularly pointed out that the control of the enable signal SDOE is prior to the control of the zero-voltage enable signal SDOZ. In detail, as shown in FIG. 4, when the enable signal SDOE outputted by the timing control module 120 is in the low level stage, the driving module 130 outputs high impedance regardless of whether the zero-voltage enable signal SDOZ is in the high level stage or the low level stage. When both the enable signal SDOE and the zero-voltage enable signal SDOZ are in the high level stage, the driving module 130 discharges the driving voltage VD outputted to each pixel from the initial voltage value to zero volt. When the enable signal SDOE is in the high level stage and the zero-voltage enable signal SDOZ is in the low level stage, the driving module 130 makes the driving voltage VD reach the target voltage value.

[0069] Referring to FIG. 1 and FIG. 5, FIG. 5 is a flowchart showing the driving method of the cholesteric liquid crystal display device of the second embodiment of the present disclosure. It must be pointed out that the cholesteric liquid crystal display device 100 in the first embodiment is configured to implement the driving method 200 of the cholesteric liquid crystal display device, but the driving method 200 of the cholesteric liquid crystal display device of the present disclosure is not limited to be realized by the cholesteric liquid crystal display device 100 of the present disclosure.

[0070] The driving method 200 of the cholesterol liquid crystal display device comprises the following steps S01, S02, S03. In step S01, the driving module 130 confirms whether the driving voltage VD changes polarity. In step S02, the timing control module 120 outputs the enable signal SDOE, the latch signal STB and the zero voltage enable signal SDOZ. The enable signal SDOE is used to control the driving module 130 to stop outputting the driving voltage VD, the latch signal STB is used to control the driving module 130 to discharge the driving voltage VD to zero volts and control the driving module 130 to latch the image data Data and output the driving voltage VD, and the zero voltage enable signal SDOZ is used to control the driving module 130 to discharge the driving voltage VD output to each pixel of the cholesterol liquid crystal display panel 110 to zero volts. In step S03, the driving module 130 receives the enable signal SDOE, the latch signal STB and the zero voltage enable signal SDOZ to output the driving voltage VD to the cholesterol liquid crystal display panel 110.

[0071] When the latch signal STB output by the timing control module 120 is in the high level stage, the driving module 130 latches the image data Data; and when the latch signal STB is in the low level stage, the driving module 130 outputs the driving voltage VD to the cholesterol liquid crystal display panel 110.

[0072] It should be particularly pointed out that when the driving module 130 confirms that the driving voltage VD changes polarity, in the high level stage of the latch signal STB, zero voltage is output to discharge the driving voltage VD from the initial voltage value to zero volts, and in the low level stage of the latch signal STB, the driving voltage VD reaches the target voltage value from zero volts.

[0073] Furthermore, when the enable signal SDOE is in the high level stage, the driving module 130 outputs the driving voltage VD to the cholesterol liquid crystal display panel 110; and when the enable signal SDOE is in the low level stage, the driving module 130 stops outputting the driving voltage VD.

[0074] In addition, when the enable signal SDOE and the zero voltage enable signal SDOZ are both in the high level stage, the driving voltage VD output to each pixel is discharged from the initial voltage value to zero volts. And when the enable signal SDOE is in the high level stage and the zero voltage enable signal SDOZ is in the low level stage, the driving voltage VD reaches the target voltage value.

[0075] From the above embodiment, the present disclosure has the following advantages: in the case of polarity change of the driving voltage, the driving voltage is first discharged to zero volts, and then reaches the target voltage value from zero volts, which can greatly reduce the power consumption of the cholesterol liquid crystal display panel, and further optimize the cost of the cholesterol liquid crystal display device.

[0076] Although the present disclosure has been disclosed with reference to the examples above, it is not intended to limit the present disclosure, and any person skilled in the art, without departing from the spirit and scope of the present disclosure, can make some changes and modifications, and therefore the scope of protection of the present disclosure shall be subject to the claims.

Claims

1. A cholesteric liquid crystal display device, characterized by comprising: A cholesteric liquid crystal display panel comprising: a plurality of row electrodes; and a plurality of column electrodes perpendicular to the plurality of row electrodes and forming a plurality of pixels with the plurality of row electrodes; a timing control module for outputting an enable signal and a latch signal; and a driving module electrically connected to the timing control module and the cholesteric liquid crystal display panel for receiving the enable signal and the latch signal and outputting a driving voltage to each of the pixels respectively; wherein the driving voltage outputted by the driving module is from an initial voltage value to a target voltage value corresponding to an image data, the enable signal is for controlling the driving module to stop outputting the driving voltage, and the latch signal is for controlling the driving module to discharge the driving voltage to zero volt. The latch signal is further for controlling the driving module to latch the image data and output the driving voltage.

2. The cholesterol liquid crystal display device according to claim 1, wherein 3. The cholesteric liquid crystal display device of claim 2, wherein the driving module latches the image data when the latch signal is in a high level stage; and the driving module outputs the driving voltage to the cholesteric liquid crystal display panel when the latch signal is in a low level stage. The driving module makes the driving voltage from the initial voltage value to the target voltage value when the latch signal is in the high level stage.

4. The cholesterol liquid crystal display device according to claim 3, wherein The driving module is further for, when the driving voltage changes polarity, 5. The cholesterol liquid crystal display device according to claim 3, wherein outputting a zero volt voltage to make the driving voltage discharge from the initial voltage value to zero volt when the latch signal is in the high level stage; and making the driving voltage from zero volt to the target voltage value when the latch signal is in the low level stage. The driving module outputs the driving voltage from the initial voltage value to zero volt and continues from zero volt to the target voltage value when zero volt is between the initial voltage value and the target voltage value.

6. The cholesterol liquid crystal display device according to claim 1, wherein 7. The cholesteric liquid crystal display device of claim 1, wherein the driving module outputs the driving voltage to the cholesteric liquid crystal display panel when the enable signal outputted by the timing control module is in a high level stage; and the driving module stops outputting the driving voltage when the enable signal outputted by the timing control module is in a low level stage. The timing control module is further for outputting a zero voltage enable signal; 8. The cholesterol liquid crystal display device according to claim 7, wherein the driving module makes the driving voltage outputted to each of the pixels discharge from the initial voltage value to zero volt when the enable signal and the zero voltage enable signal outputted by the timing control module are both in the high level stage; and the driving module makes the driving voltage to the target voltage value when the enable signal outputted by the timing control module is in the high level stage and the zero voltage enable signal is in the low level stage. The driving voltage comprises a plurality of scan driving voltages and a plurality of data driving voltages, and the driving module is further for outputting the plurality of scan driving voltages to the plurality of row electrodes respectively and outputting the plurality of data driving voltages to the plurality of column electrodes respectively. The driving module comprises:

9. The cholesterol liquid crystal display device according to claim 1, wherein a row driver electrically connected to the plurality of row electrodes and for outputting the plurality of scan driving voltages; and 10. The cholesterol liquid crystal display device according to claim 9, wherein a column driver electrically connected to the plurality of column electrodes and for outputting the plurality of data driving voltages. A cholesteric liquid crystal display panel comprising: ​ 11. A method for driving a cholesteric liquid crystal display device, the cholesteric liquid crystal display device comprising a cholesteric liquid crystal display panel, a timing control module, and a driving module, the cholesteric liquid crystal display panel comprising a plurality of pixels, the method for driving the cholesteric liquid crystal display device comprising: ​ The driving module determines whether a driving voltage changes polarity; The timing control module outputs an enable signal and a latch signal, the enable signal is used to control the driving module to stop outputting the driving voltage, and the latch signal is used to control the driving module to discharge the driving voltage to zero volts; And The driving module receives the enable signal and the latch signal and outputs the driving voltage to each pixel corresponding to the cholesteric liquid crystal display panel respectively; The driving voltage output by the driving module reaches a target voltage value corresponding to an image data from an initial voltage value.

12. The driving method of a cholesteric liquid crystal display device as claimed in claim 11, wherein The latch signal is further used to control the driving module to latch the image data and output the driving voltage.

13. The driving method of the cholesteric liquid crystal display device of claim 12, wherein, when the latch signal is in a high level stage, the driving module latches the image data; and when the latch signal is in a low level stage, the driving module outputs the driving voltage to the cholesteric liquid crystal display panel.

14. The driving method of a cholesteric liquid crystal display device as claimed in claim 13, wherein The driving module makes the driving voltage reach the target voltage value from the initial voltage value when the latch signal is in the high level stage.

15. The method for driving a cholesterol liquid crystal display device according to claim 13, wherein Further comprising: The driving module, when the driving voltage changes polarity, in the high level stage of the latch signal, outputs a zero-volt voltage, so that the driving voltage is discharged from the initial voltage value to zero volts; and in the low level stage of the latch signal, makes the driving voltage reach the target voltage value from zero volts.

16. The driving method of a cholesteric liquid crystal display device as claimed in claim 11, wherein When zero volts is between the initial voltage value and the target voltage value, the driving voltage output by the driving module is discharged from the initial voltage value to zero volts, and continues to reach the target voltage value from zero volts.

17. The driving method of the cholesteric liquid crystal display device of claim 11, wherein, when the enable signal is in a high level stage, the driving module outputs the driving voltage to the cholesteric liquid crystal display panel; and when the enable signal is in a low level stage, the driving module stops outputting the driving voltage.

18. The driving method of a cholesteric liquid crystal display device as claimed in claim 17, wherein, Further comprising outputting a zero-voltage enable signal by the timing control module; when the enable signal and the zero-voltage enable signal output by the timing control module are both in a high level stage, the driving module makes the driving voltage output to each pixel be discharged from the initial voltage value to zero volts; when the enable signal output by the timing control module is in a high level stage and the zero-voltage enable signal is in a low level stage, the driving module makes the driving voltage reach the target voltage value.

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