TWI844431B - A voltage mode control module for reducing operating voltage of cholesterol liquid crystal display device, and a cholesterol liquid crystal display device - Google Patents

Abstract

The present invention relates to a voltage mode control module for reducing operating voltage of cholesterol liquid crystal display device, and a cholesterol liquid crystal display device. The voltage mode control module includes a timing controller, which is used to output the XPOL control voltage signal. The voltage conversion circuit receives the COM_SW_EN control voltage signal and the COM_POL control voltage signal generated by the timing controller. Subsequently, the voltage conversion circuit outputs a corresponding voltage to the common electrode. Through the COM_POL control voltage signal and the COM_SW_EN control voltage signal, the common electrode is set to a high voltage level state of positive or negative voltage. This ensures that during the clearing or display screen segment, the odd voltage output channel or even voltage output channel, along with the common electrode, have sufficient liquid crystal reset voltage to affect the liquid crystal for clearing or displaying the screen.

Description

Voltage mode control module for reducing operating voltage of cholesterol liquid crystal display device and cholesterol liquid crystal display device

The present invention relates to a voltage mode control module and a cholesterol liquid crystal display device for reducing the operating voltage of a cholesterol liquid crystal display device, and in particular to a voltage mode control module and a device for reducing the operating voltage of a cholesterol liquid crystal display device by using an XPOL control voltage signal and a COM_POL control voltage signal with a specific multiple relationship in frequency or cycle.

The display medium used in the cholesterol liquid crystal display device is cholesterol liquid crystal, which has a bi-stable characteristic. Specifically, the cholesterol liquid crystal molecules have two stable states: focal conic state and planar state. Therefore, it has a bi-stable characteristic, that is, the cholesterol liquid crystal does not need additional energy from the outside to maintain the original liquid crystal molecular arrangement state. When a voltage is applied, the arrangement state of the cholesterol liquid crystal molecules can be controlled to switch between the two stable states of focal conic state and planar state.

In common sense, the voltage level must be raised to an operating voltage of +-40 volts (V) to generate sufficient liquid crystal reset voltage to change the arrangement of cholesterol liquid crystal molecules to drive the cholesterol liquid crystal display device to clear or update the screen. However, applying this operating voltage is a high-energy, high-specification and high-cost method.

Therefore, without increasing the operating voltage, the screen clearing and retention requirements of cholesterol liquid crystal display devices can be met, and the process difficulty and development cost can be reduced. It is necessary to develop an ideal technical method to solve the above problems.

The purpose of the present invention is to provide a voltage mode control module and a cholesterol liquid crystal display device that reduce the operating voltage of a cholesterol liquid crystal display device. Without increasing the voltage of the operating element, the cholesterol liquid crystal display device can meet the requirements of clearing and maintaining the screen, thereby reducing the difficulty of the manufacturing process and the development cost, and at the same time increasing the feasibility of the cholesterol liquid crystal display device with dynamic content display.

The present invention relates to a voltage mode control module for reducing the operating voltage of a cholesterol liquid crystal display device. The cholesterol liquid crystal display device includes a source driving unit, and the source driving unit has a plurality of voltage output channels to output voltage to a plurality of display electrodes. The voltage output channels include an odd voltage output channel and an even voltage output channel. The plurality of display electrodes and at least one common electrode have a spacing to form a voltage to affect the transition state of the liquid crystal in the cholesterol liquid crystal display device. The voltage mode control module includes a timing controller and a voltage conversion circuit.

The timing controller can control the cholesterol liquid crystal display device to display content, and output an XPOL control voltage signal to the source drive unit. The timing controller also generates a COM_SW_EN control voltage signal and a COM_POL control voltage signal. The XPOL control voltage signal passes through the source drive unit and outputs an AC voltage corresponding to the odd voltage output channel and the even voltage output channel. The frequency or period of the XPOL control voltage signal and the COM_POL control voltage signal have a specific multiple relationship.

The voltage conversion circuit can receive the COM_SW_EN control voltage signal and the COM_POL control voltage signal generated by the timing controller. The voltage conversion circuit has a single input voltage and multiple positive voltage and negative voltage output functions. The voltage conversion circuit outputs the corresponding voltage to the common electrode. When the COM_SW_EN control voltage signal is high, the The clear screen section of the cholesterol liquid crystal display device will make the common electrode a high voltage level state. When the COM_SW_EN control voltage signal is low, it is the display screen section of the cholesterol liquid crystal display device, which will make the common electrode a low voltage level state. The low voltage level state is close to 0 volts (V), usually a low voltage slightly less than 0V, such as -1V.

40V，且顯示電壓可以是灰階驅動電壓的一種，灰階驅動電壓的絕對值通常為0V~20V。 When the COM_POL control voltage signal is high and the COM_SW_EN control voltage signal is high, the common electrode is at a positive voltage of the high voltage level state. When the COM_POL control voltage signal is low and the COM_SW_EN control voltage signal is high, the common electrode is at a negative voltage of the high voltage level state. In this way, the odd voltage output channel or the even voltage output channel is cleared in the clear screen section. There is enough liquid crystal reset voltage between the output channel and the common electrode to affect the liquid crystal to clear the screen. When the COM_SW_EN control voltage signal is low, the common electrode is at the low voltage level, so that in the display section, there is a display voltage lower than the liquid crystal reset voltage between the odd voltage output channel or the even voltage output channel and the common electrode to affect the liquid crystal to display the screen. The absolute value of the liquid crystal reset voltage is usually

40V, and the display voltage can be a kind of grayscale driving voltage, and the absolute value of the grayscale driving voltage is usually 0V~20V.

The XPOL control voltage signal outputs the AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit, which means that when the XPOL control voltage signal is high, the odd voltage output channel is a positive voltage and the even voltage output channel is a negative voltage, and when the XPOL control voltage signal is low, the odd voltage output channel is a negative voltage and the even voltage output channel is a positive voltage.

Next, the XPOL control voltage signal outputs the AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit, which means that when the XPOL control voltage signal is high, the odd voltage output channel is a negative voltage and the even voltage output channel is a positive voltage; when the XPOL control voltage signal is low, the odd voltage output channel is a positive voltage and the even voltage output channel is a negative voltage.

The XPOL control voltage signal and the COM_POL control voltage signal have a specific multiple relationship, which means that the frequency of the XPOL control voltage signal is twice the frequency of the COM_POL control voltage signal.

The XPOL control voltage signal has a specific multiple relationship with the COM_POL control voltage signal, which means that the frequency of the COM_POL control voltage signal is twice the frequency of the XPOL control voltage signal.

Furthermore, the present invention can also be a cholesterol liquid crystal display device that can reduce the operating voltage. The cholesterol liquid crystal display device includes at least one common electrode, a source drive unit, and a voltage mode control module.

The source drive unit has a plurality of voltage output channels for outputting voltage to a plurality of display electrodes. The voltage output channels include an odd voltage output channel and an even voltage output channel. There is a distance between the plurality of display electrodes and the common electrode to form a voltage to affect the transition state of the liquid crystal in the cholesterol liquid crystal display device.

The voltage mode control module further includes a timing controller and a voltage conversion circuit. The timing controller can output an XPOL control voltage signal to the source drive unit. The timing controller also generates a COM_SW_EN control voltage signal and a COM_POL control voltage signal to the voltage conversion circuit. The XPOL control voltage signal outputs an AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit. The frequency or period of the XPOL control voltage signal and the COM_POL control voltage signal has a specific The voltage conversion circuit receives the COM_SW_EN control voltage signal and the COM_POL control voltage signal generated by the timing controller, and outputs the corresponding voltage to the common electrode. When the COM_SW_EN control voltage signal is high, it is the clear screen section of the cholesterol liquid crystal display device, which will make the common electrode a high voltage level state. When the COM_SW_EN control voltage signal is low, it is the display section of the cholesterol liquid crystal display device, which will make the common electrode a low voltage level state.

When the COM_POL control voltage signal is high and the COM_SW_EN control voltage signal is high, the common electrode is at a positive voltage of the high voltage level state. When the COM_POL control voltage signal is low and the COM_SW_EN control voltage signal is high, the common electrode is at a negative voltage of the high voltage level state. Thus, when the screen segment is cleared, the odd voltage output The channel or the even voltage output channel and the common electrode have a sufficient liquid crystal reset voltage to affect the liquid crystal to clear the screen, and when the COM_SW_EN control voltage signal is low, the common electrode will be in the low voltage level state, so that during the display segment, the odd voltage output channel or the even voltage output channel and the common electrode have a display voltage lower than the liquid crystal reset voltage to affect the liquid crystal to display the screen.

In the cholesterol liquid crystal display device, the XPOL control voltage signal outputs the AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit, which means that when the XPOL control voltage signal is high, the odd voltage output channel is a positive voltage and the even voltage output channel is a negative voltage; when the XPOL control voltage signal is low, the odd voltage output channel is a negative voltage and the even voltage output channel is a positive voltage.

The XPOL control voltage signal outputs the AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit, which means that when the XPOL control voltage signal is at a high level, the odd voltage output channel is at a negative voltage and the even voltage output channel is at a positive voltage; when the XPOL control voltage signal is at a low level, the odd voltage output channel is at a positive voltage and the even voltage output channel is at a negative voltage.

In the cholesterol liquid crystal display device, the source driving unit is electrically coupled to the plurality of display electrodes through a plurality of data bus lines, wherein the plurality of data lines are selected from a plurality of data line arrangements in a group consisting of stripe and zigzag.

In the cholesterol liquid crystal display device, the XPOL control voltage signal and the COM_POL control voltage signal have a specific multiple relationship, which means that the frequency of the XPOL control voltage signal is twice the frequency of the COM_POL control voltage signal, or that the frequency of the COM_POL control voltage signal is twice the frequency of the XPOL control voltage signal.

Therefore, the voltage mode control module and cholesterol liquid crystal display device provided by the present invention for reducing the operating voltage of the cholesterol liquid crystal display device can be combined with AC and DC voltage designs to drive the cholesterol liquid crystal display device.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the attached drawings.

1: Cholesterol LCD display device

10: Common electrode

20: Voltage mode control module

21: Timing controller

22: XPOL control voltage signal

24: COM_SW_EN control voltage signal

26: COM_POL control voltage signal

27: Voltage conversion circuit

28: High voltage level state

29: Low voltage level state

30: Source drive unit

32: Voltage output channel

33: Odd voltage output channel

34: Even voltage output channel

36: Display electrode

FIG1 is a diagram showing the components of the cholesterol liquid crystal display device of the present invention; FIG2 is a schematic diagram of the first embodiment of the present invention; FIG3 is a schematic diagram of the second embodiment of the present invention; and FIG4 is a schematic diagram of various embodiments of the present invention.

The present invention relates to a voltage mode control module and a cholesterol liquid crystal display device for reducing the operating voltage of a cholesterol liquid crystal display device, wherein the operating voltage is used to increase the voltage of the original driving IC to a certain operating voltage, so that a sufficient voltage difference can be obtained to produce a sufficient liquid crystal reset voltage. Please refer to Figure 1 and Figure 2. Figure 1 is a component association diagram of the cholesterol liquid crystal display device of the present invention, and Figure 2 is a schematic diagram of the first embodiment of the present invention. A cholesterol liquid crystal display device 1 can reduce the operating voltage. The cholesterol liquid crystal display device 1 includes at least one common electrode 10, a source driving unit 30, and a voltage mode control module 20.

The common electrode 10 can be a whole electrode or a combination of multiple electrodes.

The source driving unit 30 has a plurality of voltage output channels 32 for outputting voltage to a plurality of display electrodes 36. The voltage output channel 32 includes an odd voltage output channel 33 and an even voltage output channel 34. The plurality of display electrodes 36 and the common electrode 10 have a distance to form a voltage to affect the transition state of the liquid crystal in the cholesterol liquid crystal display device 1.

The voltage mode control module 20 further includes a timing controller 21 and a voltage conversion circuit 27. The timing controller 21 can output an XPOL control voltage signal 22 to the source drive unit 30. The timing controller 21 also generates a COM_SW_EN control voltage signal 24 and a COM_POL control voltage signal 26 to the voltage conversion circuit 27. The L control voltage signal 22 outputs the AC voltage corresponding to the odd voltage output channel 33 and the even voltage output channel 34 through the source drive unit 30, wherein the frequency or cycle of the XPOL control voltage signal 22 and the COM_POL control voltage signal 26 has a specific multiple relationship, and the voltage conversion circuit 27 receives the COM_SW_EN control signal generated by the timing controller 21. The voltage signal 24 and the COM_POL control voltage signal 26, the voltage conversion circuit 27 outputs the corresponding voltage to the common electrode 10, wherein when the COM_SW_EN control voltage signal 24 is high, it is the clear screen section of the cholesterol liquid crystal display device 1, which will make the common electrode 10 a high voltage level state 28 such as +20V and -20V. When the COM_SW_EN control voltage signal 24 is at a low level, it is the display section of the cholesterol liquid crystal display device 1, which will make the common electrode 10 a low voltage level state 29. The low voltage level state 29 will make the common electrode 10 close to 0V due to the panel vacuum electrode effect (Feed-Through), usually a low voltage slightly less than 0V, such as -1V.

When the COM_POL control voltage signal 26 is high and the COM_SW_EN control voltage signal 24 is high, the common electrode 10 is at the positive voltage of the high voltage level state 28. When the COM_POL control voltage signal 26 is low and the COM_SW_EN control voltage signal 24 is high, the common electrode 10 is at the negative voltage of the high voltage level state 28. In this way, when the screen is cleared, there is a sufficient liquid crystal reset voltage between the odd voltage output channel 33 or the even voltage output channel 34 and the common electrode 10 to affect the liquid crystal to clear the screen. When the COM_SW_EN control voltage is low, the common electrode 10 is at the positive voltage of the high voltage level state 28. Signal 24 is low, and no matter what the state of COM_POL control voltage signal 26 is, the common electrode 10 will be in the low voltage level state 29. In other words, no matter whether the state of COM_POL control voltage signal 26 is high or low, as long as the COM_SW_EN control voltage signal 24 is low, the common electrode 10 will be in the low voltage level state 29, so that during the display segment, the odd voltage output channel 33 or the even voltage output channel 34 and the common electrode 10 have a display voltage lower than the liquid crystal reset voltage to affect the liquid crystal to display the picture, and the display voltage can be a kind of grayscale driving voltage.

The aforementioned driver IC can also be the source driver unit 30, that is, when the source driver unit 30 pulls up the voltage to +-20V, it can generate a voltage difference of 40V to produce a sufficient liquid crystal reset voltage.

Next, please refer to Figure 2. Figure 2 shows the situation where the frequency of the XPOL control voltage signal 22 is twice that of the COM_POL control voltage signal 26. The XPOL control voltage signal 22 outputs the AC voltage corresponding to the odd voltage output channel 33 and the even voltage output channel 34 through the source drive unit 30, and the voltage conversion circuit 27 receives the COM_SW_EN control voltage signal 24 and the COM_POL control voltage signal 26 generated by the timing controller 21, and the voltage conversion circuit 27 outputs the corresponding voltage to the common electrode 10.

According to the characteristics of cholesterol liquid crystal, the driving mode can be divided into Reset Phase and Display Phase. Reset Phase is used to clear the screen content, and Display Phase is used to display the screen content.

In the Display Phase, the absolute value of the driving voltage range of the cholesterol liquid crystal display device 1 is about 0V~20V, that is, the grayscale driving voltage is about 0~20V. At this time, the COM_SW_EN control voltage signal 24 is disabled and is in a low-level state. The common electrode 10 ignores the COM_POL control voltage signal 26 to make the voltage at 0V, or fine-tunes the voltage of the common electrode 10 according to the panel vacuum electrode effect. The source driving unit 30 outputs according to the grayscale voltage required for displaying the content.

In the Reset Phase, the absolute value of the driving voltage range of the cholesterol liquid crystal display device 1 is about 40V, that is, the reset voltage is about 40V. At this time, the COM_SW_EN control voltage signal 24 is enabled to be high, and the voltage conversion circuit controls the voltage of the common electrode 10 to switch between -20V and +20V according to the level of the COM_POL control voltage signal 26. When the COM_POL control voltage signal 26 is low, the voltage conversion circuit outputs the voltage of the common electrode 10 as -20V, and when the COM_POL control voltage signal 26 is high, the voltage conversion circuit outputs the voltage of the common electrode 10 as +20V.

Furthermore, the source drive unit outputs the highest voltage according to the XPOL control voltage signal 22. In the reset phase clear state, when the XPOL control voltage signal 22 is high, the odd-numbered output channels output +20V, and the even-numbered output channels output -20V. When the XPOL control voltage signal 22 is low, the odd-numbered output channels output -20V, and the even-numbered output channels output +20V.

In the cholesterol liquid crystal display device 1 shown in FIG1 , the voltage difference between the odd voltage output channel 33 and the common electrode 10 connected to the source driving unit 30 reaches 40V in Frame N, Frame N+3, Frame N+7, and Frame N+8, and the reset phase is entered. The voltage difference between the even voltage output channel 34 and the common electrode 10 connected to the source driving unit 30 reaches 40V in Frame N+1, Frame N+2, Frame N+6, and Frame N+9, and the reset phase is entered because the voltage difference between the two ends of the cholesterol liquid crystal molecules reaches 40V in absolute value.

Next, the output channels connected to the source drive unit 30 with odd numbers are in Frame N+1, Frame N+2, Frame N+6, and Frame N+9, because the absolute value of the voltage difference between the two ends of the cholesterol liquid crystal molecules is 0V, the white state is presented, that is, the reflective state. The output channels connected to the source drive unit 30 with even numbers are in Frame N, Frame N+3, Frame N+7, and Frame N+8, because the absolute value of the voltage difference between the two ends of the cholesterol liquid crystal molecules is 0V, the white state is presented, that is, the reflective state.

In the Display Phase, the ground GND in the common electrode 10 can be 0V or a very low voltage. This state is a DC state. In the Reset Phase, the common electrode 10 moves in a high voltage level state 28 such as +20V or -20V. This back-and-forth positive and negative state is an AC state.

In the cholesterol liquid crystal display device 1, the XPOL control voltage signal 22 and the COM_POL control voltage signal 26 have a specific multiple relationship, which means that the frequency of the XPOL control voltage signal 22 is twice the frequency of the COM_POL control voltage signal 26, or that the period of the COM_POL control voltage signal 26 is twice the frequency of the XPOL control voltage signal 22.

Please refer to Figure 3, which is a schematic diagram of the second embodiment. Figure 3 shows the situation when the frequency of the COM_POL control voltage signal 26 is twice that of the XPOL control voltage signal 22. The XPOL control voltage signal 22 and the COM_POL control voltage signal 26 have a specific multiple relationship, which means that the frequency of the COM_POL control voltage signal 26 is twice the frequency of the XPOL control voltage signal 22, that is, half the period.

Furthermore, the source drive unit outputs the highest voltage according to the XPOL control voltage signal 22. In the reset phase clear state, when the XPOL control voltage signal 22 is high, the odd-numbered output channels output +20V, and the even-numbered output channels output -20V. When the XPOL control voltage signal 22 is low, the odd-numbered output channels output -20V, and the even-numbered output channels output +20V.

Please refer to Figure 4, which is a schematic diagram of various embodiments. As shown in the figure, the XPOL control voltage signal 22 has high potential and low potential. The XPOL control voltage signal 22 can output multiple odd voltage output channels 33 and multiple even voltage output channels 34 corresponding to the AC voltage through the source drive unit, where the odd number 32 in the voltage output channel is the odd voltage output channel 33, and the even number is the even voltage output channel 34. In this way, a total of eight types can be distinguished, and the aforementioned Figures 2 and 3 are the first type.

In the first type, the XPOL control voltage signal 22 outputs the AC voltage corresponding to the odd voltage output channel 33 and the even voltage output channel 34 through the source drive unit, which means that when the XPOL control voltage signal 22 is at a high level, the odd voltage output channel 33 is a positive voltage and the even voltage output channel 34 is a negative voltage; when the XPOL control voltage signal 22 is at a low level, the odd voltage output channel 33 is a negative voltage and the even voltage output channel 34 is a positive voltage.

In the second type, when the XPOL control voltage signal 22 is at a high level, the odd voltage output channel 33 is at a negative voltage, and the even voltage output channel 34 is at a positive voltage; when the XPOL control voltage signal 22 is at a low level, the odd voltage output channel 33 is at a positive voltage, and the even voltage output channel 34 is at a negative voltage.

In the third type, when the XPOL control voltage signal 22 is at a high level, the odd voltage output channel 33 is arranged in positive and negative voltages, and the even voltage output channel 34 is also arranged in positive and negative voltages. When the XPOL control voltage signal 22 is at a low level, the odd voltage output channel 33 is arranged in negative and positive voltages, and the even voltage output channel 34 is also arranged in negative and positive voltages.

In the fourth type, when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 is arranged in a negative-positive voltage arrangement, and the even voltage output channel 34 is arranged in a negative-positive voltage arrangement; when the XPOL control voltage signal 22 is low, the odd voltage output channel 33 is arranged in a positive-negative voltage arrangement, and the even voltage output channel 34 is arranged in a positive-negative voltage arrangement.

In the fifth type, when the XPOL control voltage signal 22 is at a high level, the odd voltage output channel 33 is arranged in positive and negative voltages, and the even voltage output channel 34 is arranged in negative and positive voltages; when the XPOL control voltage signal 22 is at a low level, the odd voltage output channel 33 is arranged in negative and positive voltages, and the even voltage output channel 34 is arranged in positive and negative voltages.

In the sixth type, when the XPOL control voltage signal 22 is at a high level, the odd voltage output channel 33 is arranged in a negative-positive voltage arrangement, and the even voltage output channel 34 is arranged in a positive-negative voltage arrangement; when the XPOL control voltage signal 22 is at a low level, the odd voltage output channel 33 is arranged in a positive-negative voltage arrangement, and the even voltage output channel 34 is arranged in a negative-positive voltage arrangement.

In the seventh type, when the XPOL control voltage signal 22 is at a high level, the odd voltage output channel 33 and the even voltage output channel 34 are at a positive voltage, and when the XPOL control voltage signal 22 is at a low level, the odd voltage output channel 33 and the even voltage output channel 34 are at a negative voltage.

In the eighth type, when the XPOL control voltage signal 22 is at a high level, the odd voltage output channel 33 and the even voltage output channel 34 are at a negative voltage, and when the XPOL control voltage signal 22 is at a low level, the odd voltage output channel 33 and the even voltage output channel 34 are at a positive voltage.

Therefore, by using the voltage mode control module 20 and cholesterol liquid crystal display device 1 provided by the present invention to reduce the operating voltage of the cholesterol liquid crystal display device 1, the operating voltage range of the source drive unit 30 can be reduced from at least ±40V to ±20V, reducing the design difficulty, reducing costs and reducing power consumption, so as to meet the requirements of clearing and maintaining the screen of the cholesterol liquid crystal display device 1 without increasing the voltage of the operating element, and increase the feasibility of the cholesterol liquid crystal display device 1 with dynamic content display.

The above detailed description of the preferred specific embodiments is intended to more clearly describe the features and spirit of the present invention, but is not intended to limit the scope of the present invention by the preferred specific embodiments disclosed above. On the contrary, the purpose is to cover various changes and arrangements with equivalents within the scope of the patent that the present invention intends to apply for.

1: Cholesterol LCD display device

10: Common electrode

20: Voltage mode control module

21: Timing controller

22: XPOL control voltage signal

24: COM_SW_EN control voltage signal

26:COM_POL control voltage signal

27: Voltage conversion circuit

30: Source drive unit

32: Voltage output channel

33: Odd voltage output channel

34: Even voltage output channel

36: Display electrode

Claims (10)

A voltage mode control module for reducing the operating voltage of a cholesterol liquid crystal display device. The cholesterol liquid crystal display device includes a source driving unit. The source driving unit has a plurality of voltage output channels to output voltage to a plurality of display electrodes. The voltage output channels include an odd voltage output channel and an even voltage output channel. The plurality of display electrodes and at least one common electrode have a spacing to form a voltage to affect the transition state of the liquid crystal in the cholesterol liquid crystal display device. The voltage mode control module includes: a timing controller, outputting an XPOL control voltage signal to the source driving unit, and the timing controller also generates a COM_SW _EN control voltage signal and a COM_POL control voltage signal, the XPOL control voltage signal outputs the AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source driving unit, wherein the frequency or cycle of the XPOL control voltage signal and the COM_POL control voltage signal has a specific multiple relationship; and a voltage conversion circuit, receiving the COM_SW_EN control voltage signal and the COM_POL control voltage signal generated by the timing controller, the voltage conversion circuit outputs the corresponding voltage to the common electrode, wherein when the COM_SW_EN control voltage signal When the COM_POL control voltage signal is high, it is the clear screen section of the cholesterol liquid crystal display device, which will make the common electrode a high voltage level state. When the COM_SW_EN control voltage signal is low, it is the display section of the cholesterol liquid crystal display device, which will make the common electrode a low voltage level state. When the COM_POL control voltage signal is high and the COM_SW_EN control voltage signal is high, the common electrode will be a positive voltage of the high voltage level state. When the COM_POL control voltage signal is low and the COM_SW_EN control voltage signal is high, the common electrode will be The pass electrode is a negative voltage of the high voltage level state, so that when the screen is cleared, the odd voltage output channel or the even voltage output channel and the common electrode have a sufficient liquid crystal reset voltage to affect the liquid crystal to clear the screen, and when the COM_SW_EN control voltage signal is low, regardless of whether the COM_POL control voltage signal is high or low, the common electrode will be in the low voltage level state, so that when the display segment is in progress, the odd voltage output channel or the even voltage output channel and the common electrode have a display voltage lower than the liquid crystal reset voltage to affect the liquid crystal to display the screen. As described in the voltage mode control module of item 1 of the patent application, the XPOL control voltage signal outputs the AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit, which means that when the XPOL control voltage signal is at a high level, the odd voltage output channel is a positive voltage and the even voltage output channel is a negative voltage; when the XPOL control voltage signal is at a low level, the odd voltage output channel is a negative voltage and the even voltage output channel is a positive voltage. As described in the voltage mode control module of item 1 of the patent application, the XPOL control voltage signal outputs the AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit, which means that when the XPOL control voltage signal is at a high level, the odd voltage output channel is at a negative voltage and the even voltage output channel is at a positive voltage, and when the XPOL control voltage signal is at a low level, the odd voltage output channel is at a positive voltage and the even voltage output channel is at a negative voltage. As described in the voltage mode control module of item 1 of the patent application scope, the XPOL control voltage signal and the COM_POL control voltage signal have a specific multiple relationship, which means that the frequency of the XPOL control voltage signal is twice the frequency of the COM_POL control voltage signal. As described in the voltage mode control module of item 1 of the patent application scope, the XPOL control voltage signal and the COM_POL control voltage signal have a specific multiple relationship, which means that the frequency of the COM_POL control voltage signal is twice the frequency of the XPOL control voltage signal. A cholesterol liquid crystal display device can reduce the operating voltage. The cholesterol liquid crystal display device includes: at least one common electrode; a source driving unit, the source driving unit has a plurality of voltage output channels to output voltage to a plurality of display electrodes, the voltage output channels include an odd voltage output channel and an even voltage output channel, the plurality of display electrodes and the common electrode have a distance to form a voltage to affect the transition state of the liquid crystal in the cholesterol liquid crystal display device; and a voltage mode control module, the voltage mode control module includes a timing controller and a voltage conversion circuit, the timing controller outputs an XPOL control voltage signal to the source driving unit The timing controller generates a COM_SW_EN control voltage signal and a COM_POL control voltage signal to a voltage conversion circuit, the XPOL control voltage signal outputs an alternating voltage corresponding to the odd voltage output channel and the even voltage output channel through the source driving unit, wherein the frequency or cycle of the XPOL control voltage signal and the COM_POL control voltage signal has a specific multiple relationship, the voltage conversion circuit receives the COM_SW_EN control voltage signal and the COM_POL control voltage signal generated by the timing controller, and the voltage conversion circuit outputs the corresponding voltage to the common electrode, wherein when When the COM_SW_EN control voltage signal is high, it is the clear screen section of the cholesterol liquid crystal display device, which will make the common electrode a high voltage level state. When the COM_SW_EN control voltage signal is low, it is the display section of the cholesterol liquid crystal display device, which will make the common electrode a low voltage level state. When the COM_POL control voltage signal is high and the COM_SW_EN control voltage signal is high, the common electrode will be a positive voltage of the high voltage level state. When the COM_POL control voltage signal is low and the COM_SW_EN control voltage signal is high, the common electrode will be a positive voltage of the high voltage level state. When the COM_SW_EN control voltage signal is at a low level, regardless of whether the COM_POL control voltage signal is at a high level or a low level, the common electrode is at a low voltage level, so that in the display segment, the odd voltage output channel or the even voltage output channel and the common electrode have a display voltage lower than the liquid crystal reset voltage to affect the liquid crystal to display the screen. As described in item 6 of the patent application scope, the cholesterol liquid crystal display device, wherein the XPOL control voltage signal outputs the AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit, means that when the XPOL control voltage signal is at a high level, the odd voltage output channel is a positive voltage and the even voltage output channel is a negative voltage, and when the XPOL control voltage signal is at a low level, the odd voltage output channel is a negative voltage and the even voltage output channel is a positive voltage. As described in item 6 of the patent application scope, the cholesterol liquid crystal display device, wherein the XPOL control voltage signal outputs the AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit, means that when the XPOL control voltage signal is at a high level, the odd voltage output channel is at a negative voltage and the even voltage output channel is at a positive voltage, and when the XPOL control voltage signal is at a low level, the odd voltage output channel is at a positive voltage and the even voltage output channel is at a negative voltage. As described in item 6 of the patent application scope, the source driving unit is electrically coupled to the plurality of display electrodes through a plurality of data bus lines, wherein the plurality of data lines are selected from a plurality of data line arrangements in a group consisting of stripe and zigzag. As described in item 6 of the patent application scope, the cholesterol liquid crystal display device, wherein the XPOL control voltage signal and the COM_POL control voltage signal have a specific multiple relationship, which means that the frequency of the XPOL control voltage signal is twice the frequency of the COM_POL control voltage signal, or that the frequency of the COM_POL control voltage signal is twice the frequency of the XPOL control voltage signal.