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

Abstract

The invention provides a voltage mode control module for reducing the operating voltage of a cholesterol liquid crystal display device and the cholesterol liquid crystal display device, and the voltage mode control module comprises a time schedule controller which is used for outputting an XPOL control voltage signal. And after the voltage conversion circuit receives the COMSWEN control voltage signal and the COMPOL control voltage signal generated by the time schedule controller, the voltage conversion circuit outputs a corresponding voltage to the common electrode. Wherein the common electrode is positive voltage or negative voltage in a high voltage level state through the COMPOL control voltage signal and the COMSWEN control voltage signal, so that when the picture section is cleared or displayed, enough liquid crystal reset voltage exists between the odd voltage output channel or the even voltage output channel and the common electrode to influence the liquid crystal to clear or display the picture.

Description

Technical Field

[0001] The present invention relates to a voltage-mode control module for reducing the operating voltage of a cholesteric liquid crystal display device and the technical field of cholesteric liquid crystal display devices, and more particularly to a voltage-mode control module and device for reducing the operating voltage of a cholesteric liquid crystal display device by controlling an XPOL voltage signal and a COM_POL voltage signal with a specific multiple relationship in frequency or period. Background Art

[0002] Cholesteric liquid crystal displays utilize cholesteric liquid crystals (CLs), a type of display medium with bistability. Specifically, the molecules of a CL have two stable states: a focal conic state and a planar state. This makes them bistable, meaning they maintain their original alignment without requiring additional energy. Applying a voltage can control the molecular alignment of the CLs to switch between the two stable states.

[0003] Conventionally, the voltage potential must be raised to an operating voltage of +-40 volts (V) to generate sufficient liquid crystal reset voltage to change the arrangement state of the cholesterol liquid crystal molecules and drive the cholesterol liquid crystal display device to clear or refresh the screen. However, applying this operating voltage is a high-energy, high-specification and high-cost method.

[0004] Therefore, in order to meet the screen clearing and retention requirements of cholesteric liquid crystal display devices without increasing the operating voltage and reduce the process difficulty and development cost, it is necessary to develop an ideal technical method to solve the above problems. Summary of the Invention

[0005] The present invention provides a voltage mode control module and a cholesteric liquid crystal display device for reducing the operating voltage of a cholesteric liquid crystal display device. Without increasing the voltage of the operating components, the cholesteric liquid crystal display device can meet the requirements of clearing and maintaining the screen, thereby reducing the process difficulty and development costs, and at the same time increasing the feasibility of the cholesteric liquid crystal display device with dynamic content display.

[0006] 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. There is a spacing between the plurality of display electrodes and at least one 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 includes a timing controller and a voltage conversion circuit.

[0007] The timing controller can control the display content of the cholesterol liquid crystal display device and output an XPOL control voltage signal to the source driver 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 driver unit and outputs an AC voltage corresponding to the odd voltage output channel and the even voltage output channel, wherein the frequency or period of the XPOL control voltage signal and the COM_POL control voltage signal have a specific multiple relationship.

[0008] 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 a high voltage, it is the clear screen segment 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 a low voltage, it is the display screen segment 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.

[0009] When the COM_POL control voltage signal is high and the COM_SW_EN control voltage signal is high, the common electrode is set to 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 set to a negative voltage of the high voltage level state. In this way, within the clear screen segment, there is a sufficient 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 clear the screen. When the COM_SW_EN control voltage signal is low, the common electrode is set to the low voltage level state. In this way, within the display segment, 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 typically ≤40V, and the display voltage can be a grayscale driving voltage. The absolute value of the grayscale driving voltage is typically 0V to 20V.

[0010] 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 driver 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.

[0011] 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 driver 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.

[0012] 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.

[0013] 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.

[0014] Furthermore, the present invention may also be a cholesteric liquid crystal display device capable of reducing operating voltage. The cholesteric liquid crystal display device includes at least one common electrode, a source driving unit, and a voltage mode control module.

[0015] The source driving 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 spacing 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.

[0016] 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 driver 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 driver unit. The frequency or period of the XPOL control voltage signal and the COM_POL control voltage signal have 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 the voltage conversion circuit outputs the corresponding voltage to the common electrode, wherein when the COM_SW_EN control voltage signal is high, it is the clear screen segment of the cholesterol liquid crystal display device, which will make the common electrode a high voltage level state, and when the COM_SW_EN control voltage signal is low, it is the display segment of the cholesterol liquid crystal display device, which will make the common electrode a low voltage level state.

[0017] Among them, 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 negative voltage of the high voltage level state, so that when the screen is cleared, there is a sufficient 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 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 when the screen is displayed, 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.

[0018] 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 driving unit, which means that when the XPOL control voltage signal is a high voltage, 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 a low voltage, the odd voltage output channel is a negative voltage and the even voltage output channel is a positive voltage.

[0019] 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, 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.

[0020] 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 buslines, wherein the plurality of data buslines are selected from a plurality of data line arrangements selected from the group consisting of stripe and zigzag.

[0021] 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

[0022] The frequency of the COM_POL control voltage signal is twice that of the XPOL control voltage signal, or the frequency of the COM_POL control voltage signal is twice that of the XPOL control voltage signal.

[0023] Therefore, the voltage mode control module for reducing the operating voltage of the cholesteric liquid crystal display device and the cholesteric liquid crystal display device provided by the present invention can be combined with AC and DC voltage designs to drive the cholesteric liquid crystal display device.

[0024] Other features and beneficial effects of the present invention will be described in the following description, and in part will become apparent from the description or be understood through practice of the present invention. The objectives and other beneficial effects of the present invention can be achieved and obtained through the structures particularly pointed out in the description, claims, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Unless otherwise specified, the positional relationships described in the drawings during the description are based on the direction in which the components are drawn as 0 datum.

[0027] Figure 1 is a diagram illustrating the association of components of a cholesteric liquid crystal display device according to the present invention;

[0028] Figure 2 is a schematic diagram of a first embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of a second embodiment of the present invention; and

[0030] Figure 4 Schematic diagrams of various embodiments of the present invention.

[0031] Reference numerals:

[0032] 1: Cholesteric liquid crystal display device

[0033] 10: Common electrode

[0034] 20: Voltage mode control module

[0035] 21: Timing controller

[0036] 22: XPOL control voltage signal

[0037] 24: COM_SW_EN control voltage signal

[0038] 26: COM_POL control voltage signal

[0039] 27: Voltage conversion circuit

[0040] 28: High voltage level state

[0041] 29: Low voltage level state

[0042] 30: Source driver unit

[0043] 32: Voltage output channel

[0044] 33: Odd voltage output channel

[0045] 34: Even voltage output channel

[0046] 36: Display electrode DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments; the technical features designed in different implementation modes of the present invention described below can be combined with each other as long as they do not conflict with each other; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variations thereof all mean "at least including".

[0049] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integrally formed connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0050] The present invention relates to a voltage mode control module for reducing the operating voltage of a cholesteric liquid crystal display device and a cholesteric liquid crystal display device. The operating voltage is used to increase the voltage of the original driver IC to a certain operating voltage, so that a sufficient voltage difference can be obtained to produce a sufficient liquid crystal reset voltage. Figure 1 And match Figure 2 , Figure 1 is a component association diagram of the cholesteric liquid crystal display device of the present invention, Figure 21 is a schematic diagram of a first embodiment of the present invention, wherein a cholesteric liquid crystal display device 1 can reduce an operating voltage, and the cholesteric liquid crystal display device 1 includes at least one common electrode 10 , a source driving unit 30 , and a voltage mode control module 20 .

[0051] The common electrode 10 can be a whole electrode or a combination of multiple electrodes.

[0052] 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 channels 32 include an odd voltage output channel 33 and an even voltage output channel 34. There is a spacing between the plurality of display electrodes 36 and the common electrode 10 to form a voltage to affect the transition state of the liquid crystal in the cholesterol liquid crystal display device 1.

[0053] 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 driver 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 XPOL control voltage signal 22 outputs an AC voltage corresponding to the odd voltage output channel 33 and the even voltage output channel 34 through the source driver unit 30. The frequency or period of the XPOL control voltage signal 22 and the COM_POL control voltage signal 26 has a specific multiple relationship. The voltage conversion circuit 27 receives the COM_SW_EN signal generated by the timing controller 21. The control 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 a high voltage, it is the clear screen segment 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, and when the COM_SW_EN control voltage signal 24 is a low voltage, it is the display segment 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 influence of the panel vacuum electrode effect (Feed-Through), usually a low voltage slightly less than 0V, such as -1V.

[0054] Among them, when the COM_POL control voltage signal 26 is a high voltage and the COM_SW_EN control voltage signal 24 is a high voltage, the common electrode 10 will be a positive voltage of the high voltage level state 28. When the COM_POL control voltage signal 26 is a low voltage and the COM_SW_EN control voltage signal 24 is a high voltage, the common electrode 10 will be a negative voltage of the high voltage level state 28. In this way, during the clearing segment, 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 signal 24 is a low voltage, the common electrode 10 will be in the low voltage level state 29. In this way, during the display segment, there is a display voltage lower than the 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 display the screen, and the display voltage can be a type of grayscale driving voltage.

[0055] Furthermore, the aforementioned driver IC may 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.

[0056] Continue, see Figure 2 . Figure 2 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 driver unit 30 . 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 .

[0057] 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.

[0058] During the Display Phase, the absolute value of the driving voltage range of the cholesteric liquid crystal display device 1 is approximately 0V to 20V, that is, the grayscale driving voltage is approximately 0V to 20V. At this time, the COM_SW_EN control voltage signal 24 is disabled and is in a low potential state. The common electrode 10 ignores the COM_POL control voltage signal 26 to keep the voltage at 0V, or after fine-tuning the voltage of the common electrode 10 according to the panel vacuum electrode effect, the source driver unit 30 outputs the grayscale voltage required by the display content.

[0059] During the Reset Phase, the absolute value of the driving voltage range of the cholesterol liquid crystal display device 1 is approximately 40V, that is, the reset voltage is approximately 40V. At this time, the COM_SW_EN control voltage signal 24 is enabled to a high voltage. The voltage conversion circuit controls the voltage of the common electrode 10 to switch between -20V and +20V according to the voltage level of the COM_POL control voltage signal 26. When the COM_POL control voltage signal 26 is a low voltage, the voltage conversion circuit outputs a voltage of -20V for the common electrode 10. When the COM_POL control voltage signal 26 is a high voltage, the voltage conversion circuit outputs a voltage of +20V for the common electrode 10.

[0060] Furthermore, the source driver unit outputs the highest voltage according to the XPOL control voltage signal 22. In the ResetPhase 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.

[0061] Matching Figure 1 In the cholesteric liquid crystal display device 1, the odd voltage output channel 33 connected to the source driver unit 30 and the common electrode 10 enters the Reset Phase when the absolute value of the voltage difference between the two reaches 40V in Frame N, Frame N+3, Frame N+7, and Frame N+8. The even voltage output channel 34 connected to the source driver unit 30 and the common electrode 10 enters the Reset Phase when the absolute value of the voltage difference between the two ends of the cholesteric liquid crystal molecules reaches 40V in Frame N+1, Frame N+2, Frame N+6, and Frame N+9.

[0062] Next, the odd-numbered output channels connected to the source driving unit 30 present a white, i.e., reflective state, during Frame N+1, Frame N+2, Frame N+6, and Frame N+9 because the absolute value of the voltage difference across the cholesterol liquid crystal molecules is 0V. The even-numbered output channels connected to the source driving unit 30 present a white, i.e., reflective state, during Frame N, Frame N+3, Frame N+7, and Frame N+8 because the absolute value of the voltage difference across the cholesterol liquid crystal molecules is 0V.

[0063] During the Display Phase, the ground GND in the common electrode 10 can be 0V or a very low voltage, which is a DC state. During the Reset Phase, the common electrode 10 moves between a high voltage level 28 such as +20V or -20V. This back-and-forth positive and negative state is an AC state.

[0064] In the cholesteric 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.

[0065] See also Figure 3 , Figure 3 is a schematic diagram of the second embodiment. Figure 3 This is 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.

[0066] Furthermore, the source driver unit outputs the highest voltage according to the XPOL control voltage signal 22. In the ResetPhase 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.

[0067] See also Figure 4 , Figure 4Schematic diagrams of various embodiments. As shown in the figure, the XPOL control voltage signal 22 has high and low potentials. The XPOL control voltage signal 22 can output AC voltages corresponding to multiple odd voltage output channels 33 and multiple even voltage output channels 34 through the source driver unit. Among the voltage output channels 32, odd numbers are odd voltage output channels 33, and even numbers are even voltage output channels 34. In this way, a total of eight types can be distinguished. The aforementioned Figure 2 and Figure 3 This is the first form.

[0068] In the first embodiment, the XPOL control voltage signal 22 outputs the AC voltages corresponding to the odd voltage output channel 33 and the even voltage output channel 34 through the source driver unit. This means that when the XPOL control voltage signal 22 is high, 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 low, the odd voltage output channel 33 is a negative voltage and the even voltage output channel 34 is a positive voltage.

[0069] The odd voltage output channel 33 is a negative voltage, and the even voltage output channel 34 is a positive voltage. When the XPOL control voltage signal 22 is at a low level, the odd voltage output channel 33 is a positive voltage, and the even voltage output channel 34 is a negative voltage.

[0070] In the third type, when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 is arranged in a positive and negative voltage arrangement, and the even voltage output channel 34 is also arranged in a positive and negative voltage arrangement. When the XPOL control voltage signal 22 is low, the odd voltage output channel 33 is arranged in a negative and positive voltage arrangement, and the even voltage output channel 34 is also arranged in a negative and positive voltage arrangement.

[0071] 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.

[0072] In the fifth embodiment, when the XPOL control voltage signal 22 is high, 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. When the XPOL control voltage signal 22 is low, 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.

[0073] In the sixth embodiment, when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 is arranged in a negative-positive voltage configuration, and the even voltage output channel 34 is arranged in a positive-negative voltage configuration. When the XPOL control voltage signal 22 is low, the odd voltage output channel 33 is arranged in a positive-negative voltage configuration, and the even voltage output channel 34 is arranged in a negative-positive voltage configuration.

[0074] In the seventh embodiment, when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 and the even voltage output channel 34 are positive voltages, and when the XPOL control voltage signal 22 is low, the odd voltage output channel 33 and the even voltage output channel 34 are negative voltages.

[0075] In the eighth embodiment, when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 and the even voltage output channel 34 are negative voltages, and when the XPOL control voltage signal 22 is low, the odd voltage output channel 33 and the even voltage output channel 34 are positive voltages.

[0076] In summary, by utilizing the voltage mode control module 20 and the cholesterol liquid crystal display device 1 provided by the present invention for reducing the operating voltage of the cholesterol liquid crystal display device 1, the operating voltage range of the source driving unit 30 can be reduced from at least ±40V to ±20V, thereby reducing design difficulty, reducing costs and reducing power consumption, so as to meet the requirements of screen clearing and retention of the cholesterol liquid crystal display device 1 without increasing the voltage of the operating components, and increase the feasibility of the cholesterol liquid crystal display device 1 to display dynamic content.

[0077] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the present invention may be improved in only one or several aspects, without having to simultaneously solve all the technical problems listed in the prior art or background art. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as limiting the claim.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A voltage mode control module for reducing the operating voltage of a cholesterol liquid crystal display device, characterized in that The cholesteric 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 5 have a spacing to form a voltage to affect the transition state of the liquid crystal in the cholesteric liquid crystal display device, and the voltage mode control module includes: a timing controller, outputting an XPOL control voltage signal to the source driving unit, the timing controller also generating a COM_SW_EN control voltage signal and a COM_POL control voltage signal, the XPOL control voltage signal outputting an AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source driving unit 0, wherein the frequency or period of the XPOL control voltage signal and the COM_POL control voltage signal have 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 a corresponding voltage to the common electrode, wherein when the COM_SW_EN control voltage signal is at a high level, it is a clear screen section of the cholesterol liquid crystal display device, and the common electrode is in a high voltage level state; when the COM_SW_EN control voltage signal is at a low level, it is a display section of the cholesterol liquid crystal display device, and the common electrode is in a low voltage level state; 0Wherein, when the COM_POL control voltage signal is at a high level and the COM_SW_EN control voltage signal is at a high level, the common electrode will be at a positive voltage of the high voltage level state; when the COM_POL control voltage signal is at a low level and the COM_SW_EN control voltage signal is at a high level, the common electrode will be at a negative voltage of the high voltage level state, so that in the clearing screen segment, there is a sufficient 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 clear the screen; and when the COM_SW_EN control voltage signal is at a low level, the common electrode will be at the low voltage level state, so that in the display segment, 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.

2. The voltage mode control module according to claim 1, characterized in that: 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, which means that when the XPOL control voltage signal is at a high potential, 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 potential, the odd voltage output channel is a negative voltage and the even voltage output channel is a positive voltage.

3. The voltage mode control module according to claim 1, characterized in that: 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, which means that when the XPOL control voltage signal is at a high potential, 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 at a low potential, the odd voltage output channel is a positive voltage and the even voltage output channel is a negative voltage.

4. The voltage mode control module according to claim 1, characterized in that: 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.

5. The voltage mode control module according to claim 1, characterized in that: 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.

6. A cholesterol liquid crystal display device, characterized in that , which can reduce the operating voltage, the cholesterol liquid crystal display device comprises: at least one common electrode; a source driving unit, the source driving unit having a plurality of voltage output channels for outputting voltage to a plurality of display electrodes, the voltage output channels including an odd voltage output channel and an even voltage output channel, the plurality of display electrodes and the common electrode having a spacing therebetween to form a voltage to affect the transition state of the liquid crystal in the cholesteric 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 driver unit, the timing controller also generates a COM_SW_EN control voltage signal and a COM_POL control voltage signal to a voltage conversion circuit, the XPOL The control voltage signal outputs an AC voltage corresponding to the odd voltage output channel and the even voltage output channel through the source driving unit, wherein the frequency or period 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 a corresponding voltage to the common electrode, wherein when the COM_SW_EN control voltage signal is a high potential, it is a clear screen segment of the cholesterol liquid crystal display device, and the common electrode is in a high voltage level state, and when the COM_SW_EN control voltage signal is a low potential, it is a display segment of the cholesterol liquid crystal display device, and the common electrode is in a low voltage level state; Among them, when the COM_POL control voltage signal is at a high level and the COM_SW_EN control voltage signal is at a high level, the common electrode will be at a positive voltage of the high voltage level state. When the COM_POL control voltage signal is at a low level and the COM_SW_EN control voltage signal is at a high level, the common electrode will be at a negative voltage of the high voltage level state. In this way, when the screen is cleared, there is a sufficient 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 clear the screen. When the COM_SW_EN control voltage signal is at a low level, the common electrode will be at the low voltage level state. In this way, when the screen is displayed, 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.

7. The cholesteric liquid crystal display device according to claim 6, characterized in that: 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, which means that when the XPOL control voltage signal is at a high potential, 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 potential, the odd voltage output channel is a negative voltage and the even voltage output channel is a positive voltage.

8. The cholesteric liquid crystal display device according to claim 6, characterized in that: 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, which means that when the XPOL control voltage signal is at a high potential, 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 at a low potential, the odd voltage output channel is a positive voltage and the even voltage output channel is a negative voltage.

9. The cholesteric liquid crystal display device according to claim 6, characterized in that: 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 bus lines are selected from a plurality of data line arrangements in the group consisting of stripe and zigzag.

10. The cholesteric liquid crystal display device according to claim 6, characterized in that: 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.

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