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

Abstract

The present application provides 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 voltage mode control module includes a timing controller for outputting an XPOL control voltage signal, and a voltage conversion circuit for receiving a COM_SW_EN control voltage signal and a COM_POL control voltage signal generated by the timing controller, and outputting corresponding voltages to the common electrode. Through the COM_POL control voltage signal and the COM_SW_EN control voltage signal, the common electrode is a positive voltage or a negative voltage in a high voltage level state, so that the odd voltage output channel or the even voltage output channel has sufficient liquid crystal reset voltage to affect the liquid crystal to clear the screen or display the screen when clearing or displaying the screen section.

Description

TECHNICAL FIELD

[0001] The present application relates to a voltage mode control module and cholesteric liquid crystal display device for reducing the operating voltage of the cholesteric liquid crystal display device, and more particularly, to a voltage mode control module and device for reducing the operating voltage of the cholesteric liquid crystal display device by using an XPOL control voltage signal and a COM_POL control voltage signal with a specific frequency or period ratio. BACKGROUND

[0002] The display medium used in the cholesteric liquid crystal display device is cholesteric liquid crystal, which has a bistable characteristic. Specifically, the cholesteric liquid crystal molecules have two stable states, a focal conic state and a planar state, and thus have a bistable characteristic. That is, the cholesteric liquid crystal can maintain its original liquid crystal molecule arrangement state without external energy. When a voltage is applied, the arrangement state of the cholesteric liquid crystal molecules can be controlled to switch between the two stable states, i.e., the focal conic state and the planar state.

[0003] In general, an operating voltage of +40 volts (V) is required to generate sufficient liquid crystal reset voltage to change the arrangement state of the cholesteric liquid crystal molecules to drive the cholesteric liquid crystal display device to clear or update the screen. However, applying such an operating voltage is a high-energy, high-specification, and high-cost method.

[0004] Therefore, without increasing the operating voltage, the requirements for clearing and maintaining the screen of the cholesteric liquid crystal display device 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. SUMMARY

[0005] The present application provides a voltage mode control module and cholesteric liquid crystal display device for reducing the operating voltage of the cholesteric liquid crystal display device. Without increasing the operating voltage of the operating components, the requirements for clearing and maintaining the screen of the cholesteric liquid crystal display device can be met, thereby reducing the process difficulty and development cost, and increasing the feasibility of the cholesteric liquid crystal display device for dynamic content display.

[0006] The present invention relates to a voltage mode control module for reducing the operating voltage of a cholesteric liquid crystal display device, said cholesteric liquid crystal display device comprising a source driver unit, said source driver unit having a plurality of voltage output channels for outputting voltages to a plurality of display electrodes, said voltage output channels comprising an odd voltage output channel and an even voltage output channel, said plurality of display electrodes having a gap with at least one common electrode to form a voltage for affecting the switching of liquid crystal in said cholesteric liquid crystal display device, said voltage mode control module comprising a timing controller and a voltage conversion circuit.

[0007] Said timing controller can control the display content of said cholesteric liquid crystal display device and output an XPOL control voltage signal to said source driver unit, said timing controller also generates a COM_SW_EN control voltage signal and a COM_POL control voltage signal, said XPOL control voltage signal is outputted after passing through said source driver unit to output alternating voltages corresponding to said odd voltage output channel and said even voltage output channel, wherein said XPOL control voltage signal and said COM_POL control voltage signal have a specific multiple relationship in frequency or period.

[0008] Said voltage conversion circuit can receive said COM_SW_EN control voltage signal and said COM_POL control voltage signal generated by said timing controller, said voltage conversion circuit has a single input voltage, multiple positive voltage and negative voltage output functions, said voltage conversion circuit outputs corresponding voltages to said common electrode, wherein when said COM_SW_EN control voltage signal is high, it is the clearing picture section of said cholesteric liquid crystal display device, which makes said common electrode in a high voltage level state, when said COM_SW_EN control voltage signal is low, it is the display picture section of said cholesteric liquid crystal display device, which makes said common electrode in a low voltage level state, said low voltage level state is close to 0 volts (V), usually a low voltage slightly less than 0V, for example -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 a positive voltage at the high voltage level. When the COM_POL control voltage signal is low and the COM_SW_EN control voltage signal is high, the common electrode is a negative voltage at the high voltage level. Thus, in the clearing picture section, the odd voltage output channel or the even voltage output channel and the common electrode have sufficient liquid crystal reset voltage to affect the liquid crystal to clear the picture. When the COM_SW_EN control voltage signal is low, the common electrode is at the low voltage level. Thus, in the display section, the odd voltage output channel or the even voltage output channel and the common electrode have display voltage lower than the liquid crystal reset voltage to affect the liquid crystal to display the picture. The absolute value of the liquid crystal reset voltage is usually ≤ 40 V, and the display voltage can be one of the gray scale driving voltages, the absolute value of which is usually 0 V to 20 V.

[0010] The XPOL control voltage signal outputs the alternating voltage corresponding to the odd voltage output channel and the even voltage output channel through the source driving unit. 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] The XPOL control voltage signal outputs the alternating voltage corresponding to the odd voltage output channel and the even voltage output channel through the source driving unit. 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. 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. The frequency of the COM_POL control voltage signal is twice the frequency of the XPOL control voltage signal.

[0014] Further, the present application can also be a cholesteric liquid crystal display device with reduced operating voltage, the cholesteric liquid crystal display device comprising at least one common electrode, a source driver unit, and a voltage mode control module.

[0015] The source driver unit has a plurality of voltage output channels for outputting voltages 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 gap therebetween to form a voltage to affect the state of liquid crystal in the cholesteric liquid crystal display device.

[0016] The voltage mode control module further includes a timing controller and a voltage conversion circuit, the timing controller capable of outputting an XPOL control voltage signal to the source driver unit, the timing controller generating a COM_SW_EN control voltage signal and a COM_POL control voltage signal to the voltage conversion circuit, the XPOL control voltage signal outputting an alternating voltage corresponding to the odd voltage output channel and the even voltage output channel by the source driver unit, wherein the XPOL control voltage signal and the COM_POL control voltage signal have a specific multiple relationship in frequency or period, the 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 outputting a corresponding voltage to the common electrode, wherein when the COM_SW_EN control voltage signal is high, it is a clearing picture section of the cholesteric liquid crystal display device, causing the common electrode to be in a high voltage quiescent state, and when the COM_SW_EN control voltage signal is low, it is a display section of the cholesteric liquid crystal display device, causing the common electrode to be in a low voltage quiescent state.

[0017] Wherein, when the COM_POL control voltage signal is high and the COM_SW_EN control voltage signal is high, the common electrode is a positive voltage in the high voltage quiescent state, and when the COM_POL control voltage signal is low and the COM_SW_EN control voltage signal is high, the common electrode is a negative voltage in the high voltage quiescent state, so that during the clearing picture section, the odd voltage output channel or the even voltage output channel and the common electrode have sufficient liquid crystal reset voltage to affect the liquid crystal to clear the picture, and when the COM_SW_EN control voltage signal is low, the common electrode is in the low voltage quiescent state, so that during the display section, 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 picture.

[0018] The alternating voltage corresponding to the odd voltage output channel and the even voltage output channel outputted by the source driving unit under the control of the XPOL control voltage signal is that when the XPOL control voltage signal is high, the odd voltage output channel is positive voltage and the even voltage output channel is negative voltage, and when the XPOL control voltage signal is low, the odd voltage output channel is negative voltage and the even voltage output channel is positive voltage.

[0019] The alternating voltage corresponding to the odd voltage output channel and the even voltage output channel outputted by the source driving unit under the control of the XPOL control voltage signal is that when the XPOL control voltage signal is high, the odd voltage output channel is negative voltage and the even voltage output channel is positive voltage, and when the XPOL control voltage signal is low, the odd voltage output channel is positive voltage and the even voltage output channel is negative voltage.

[0020] The source driving unit is electrically connected to the plurality of display electrodes through a plurality of data bus lines, wherein the plurality of data bus lines are arranged in a stripe or zigzag manner.

[0021] The XPOL control voltage signal and the COM_POL control voltage signal have a specific multiple relationship, that is, the frequency of the XPOL control voltage signal is twice the frequency of the COM_POL control voltage signal, or the frequency of the COM_POL control voltage signal is twice the frequency of the XPOL control voltage signal.

[0022] The XPOL control voltage signal and the COM_POL control voltage signal have a specific multiple relationship, that is, the frequency of the XPOL control voltage signal is twice the frequency of the COM_POL control voltage signal, or the frequency of the COM_POL control voltage signal is twice the frequency 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 application can be designed to drive the cholesteric liquid crystal display device by combining alternating voltage and direct current voltage.

[0024] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the description, claims, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0025] 5In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings; in the following

[0026] The positional relationship described in the description is the direction of the components shown in the drawings as the 0 reference, unless otherwise specified.

[0027] Figure 1 is a component correlation diagram of the cholesterol liquid crystal display device of the present application;

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

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

[0030] Figure 4 is a schematic diagram of various embodiments of the present application.

[0031] Reference signs:

[0032] 1: cholesterol 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 logic state

[0041] 29: low voltage logic state

[0042] 30: source driving unit

[0043] 32: voltage output channel

[0044] 33: odd voltage output channel

[0045] 34: even voltage output channel

[0046] 36: display electrode Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0048] In the description of this invention, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof mean "at least comprising."

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrally formed connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] This invention relates to a voltage mode control module for reducing the operating voltage of a cholesterol-lowering liquid crystal display (LCD) device, and to the LCD device itself. The purpose of the operating voltage is to increase the voltage of the original driver IC to a certain operating voltage, thereby obtaining a sufficient voltage difference to produce a sufficient liquid crystal reset voltage. Please refer to [link to relevant documentation]. Figure 1 and pair Figure 2 , Figure 1 This is a component association diagram of the cholesterol liquid crystal display device of the present invention. Figure 2Figure 1 is a schematic diagram of a first embodiment of the present application. A cholesteric liquid crystal display device 1 capable of reducing the operating voltage, the cholesteric liquid crystal display device 1 comprising at least one common electrode 10, a source driver unit 30, and a voltage mode control module 20.

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

[0052] The source driver unit 30 has a plurality of voltage output channels 32 for outputting voltages to a plurality of display electrodes 36, the voltage output channels 32 including an odd voltage output channel 33 and an even voltage output channel 34, the plurality of display electrodes 36 having a gap with the common electrode 10 to form a voltage to affect the switching of liquid crystal in the cholesteric liquid crystal display device 1.

[0053] The voltage mode control module 20 further comprises a timing controller 21 and a voltage conversion circuit 27, the timing controller 21 capable of outputting an XPOL control voltage signal 22 to the source driver unit 30, the timing controller 21 generating 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 outputting an alternating voltage corresponding to the odd voltage output channel 33 and the even voltage output channel 34 by the source driver unit 30, wherein the frequency or period of the XPOL control voltage signal 22 and the COM_POL control voltage signal 26 have a specific multiple relationship, the voltage conversion circuit 27 receiving the COM_SW_EN control voltage signal 24 and the COM_POL control voltage signal 26 generated by the timing controller 21, the voltage conversion circuit 27 outputting a corresponding voltage to the common electrode 10, wherein when the COM_SW_EN control voltage signal 24 is high, it is a clearing picture section of the cholesteric liquid crystal display device 1, causing the common electrode 10 to be in a high voltage quiescent state 28 such as +20V and -20V, and when the COM_SW_EN control voltage signal 24 is low, it is a display section of the cholesteric liquid crystal display device 1, causing the common electrode 10 to be in a low voltage quiescent state 29, the low voltage quiescent state 29 causing the common electrode 10 to be close to 0V due to the panel feed-through effect, typically a low voltage slightly less than 0V, such as -1V.

[0054] 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 a positive voltage of the high voltage level 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 a negative voltage of the high voltage level 28. This makes the odd voltage output channel 33 or the even voltage output channel 34 and the common electrode 10 have enough liquid crystal reset voltage to affect the liquid crystal to clear the screen when clearing the screen section. When the COM_SW_EN control voltage signal 24 is low, the common electrode 10 is the low voltage level 29. This makes 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 screen when displaying the screen section. The display voltage can be one of the gray scale driving voltages.

[0055] The aforementioned driving IC can also be the source driving unit 30. When the source driving unit 30 pulls the high voltage to +-20V, a 40V voltage difference is generated to produce enough liquid crystal reset voltage.

[0056] Next, please refer to Figure 2 . Figure 2 The XPOL control voltage signal 22 has a frequency twice that of the COM_POL control voltage signal 26. The XPOL control voltage signal 22 outputs alternating voltages corresponding to the odd voltage output channel 33 and the even voltage output channel 34 through the source driving 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 outputs corresponding voltages to the common electrode 10.

[0057] According to the characteristics of cholesteric liquid crystal, the driving mode can be divided into Reset Phase and Display Phase. The Reset Phase is used to clear the screen content, and the Display Phase is used to display the screen content.

[0058] At the Display Phase, the absolute value of the driving voltage range of the cholesteric liquid crystal display device 1 is about 0V-20V, i.e. the gray scale driving voltage is about 0-20V, at this time the COM SW EN control voltage signal 24 is disabled at low potential, the common electrode 10 ignores the COM POL control voltage signal 26 to make the voltage at 0V, or after fine-tuning the voltage of the common electrode 10 according to the panel vacuum electrode effect, the source driving unit 30 outputs the gray scale voltage required by the display content.

[0059] At the Reset Phase, the absolute value of the driving voltage range of the cholesteric liquid crystal display device 1 is about 40V, i.e. the reset voltage is about 40V, at this time the COM SW EN control voltage signal 24 is enabled at high potential, the voltage conversion circuit switches the voltage of the common electrode 10 between -20V and +20V according to the high and low potential of the COM POL control voltage signal 26, when the COM POL control voltage signal 26 is low potential, the voltage conversion circuit outputs the voltage of the common electrode 10 as -20V, when the COM POL control voltage signal 26 is high potential, the voltage conversion circuit outputs the voltage of the common electrode 10 as +20V.

[0060] Further, the source driving unit outputs the highest voltage according to the XPOL control voltage signal 22, at the Reset Phase clear state, when the XPOL control voltage signal 22 is high potential, the output channels numbered with odd numbers output +20V, and the output channels numbered with even numbers output -20V, when the XPOL control voltage signal 22 is low potential, the output channels numbered with odd numbers output -20V, and the output channels numbered with even numbers output +20V.

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

[0062] The output channel numbered odd is connected to the output channel numbered odd of the source driving unit 30, and the output channel numbered even is connected to the output channel numbered even of the source driving unit 30. When the absolute value of the voltage difference between the two ends of the cholesteric liquid crystal molecule is 0V, the cholesteric liquid crystal molecule is in a white state, i.e., a reflective state.

[0063] In the display phase, the ground GND in the common electrode 10 can be 0V or a very low voltage. This is a direct current state. In the reset phase, the common electrode 10 is moved to a high voltage level of +20V or -20V. This is an alternating current state.

[0064] The XPOL control voltage signal 22 and the COM_POL control voltage signal 26 have a specific multiple relationship. The frequency of the XPOL control voltage signal 22 is twice the frequency of the COM_POL control voltage signal 26, or the period of the COM_POL control voltage signal 26 is twice the frequency of the XPOL control voltage signal 22.

[0065] Please refer to Figure 3 , Figure 3 is a schematic diagram of the second embodiment. Figure 3 The XPOL control voltage signal 22 and the COM_POL control voltage signal 26 have a specific multiple relationship. The frequency of the COM_POL control voltage signal 26 is twice the frequency of the XPOL control voltage signal 22, i.e., the period is half the frequency.

[0066] Further, the source driving unit outputs the highest voltage according to the XPOL control voltage signal 22. In the reset phase, when the XPOL control voltage signal 22 is high, the output channel numbered odd outputs +20V, and the output channel numbered even outputs -20V. When the XPOL control voltage signal 22 is low, the output channel numbered odd outputs -20V, and the output channel numbered even outputs +20V.

[0067] Please refer to Figure 4 , Figure 4is a schematic diagram of various embodiments. As shown, the XPOL control voltage signal 22 has high and low potential cases, the XPOL control voltage signal 22 through the source driving unit can output alternating voltage corresponding to a plurality of the odd voltage output channel 33 and a plurality of the even voltage output channel 34, wherein the voltage output channel 32 is odd, that is, the odd voltage output channel 33, and even, that is, the even voltage output channel 34, so a total of eight types can be distinguished, the foregoing Figure 2 and Figure 3 is the first type.

[0068] In the first type, the XPOL control voltage signal 22 through the source driving unit outputs alternating voltage corresponding to the odd voltage output channel 33 and the even voltage output channel 34, which means that when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 is positive voltage, and the even voltage output channel 34 is negative voltage, when the XPOL control voltage signal 22 is low, the odd voltage output channel 33 is negative voltage, and the even voltage output channel 34 is positive voltage.

[0069] In the second type, the XPOL control voltage signal 22 through the source driving unit outputs alternating voltage corresponding to the odd voltage output channel 33 and the even voltage output channel 34, which means that when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 is negative voltage, and the even voltage output channel 34 is positive voltage, when the XPOL control voltage signal 22 is low, the odd voltage output channel 33 is positive voltage, and the even voltage output channel 34 is negative voltage.

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

[0071] In the fourth type, it means that when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 is negative and positive voltage arrangement, and the even voltage output channel 34 is negative and positive voltage arrangement, when the XPOL control voltage signal 22 is low, the odd voltage output channel 33 is positive and negative voltage arrangement, and the even voltage output channel 34 is positive and negative voltage arrangement.

[0072] In the fifth type, it means that when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 is positive and negative voltage arrangement, and the even voltage output channel 34 is negative and positive voltage arrangement, when the XPOL control voltage signal 22 is low, the odd voltage output channel 33 is negative and positive voltage arrangement, and the even voltage output channel 34 is positive and negative voltage arrangement.

[0073] In the 6th mode, when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 is arranged as negative-positive voltage, and the even voltage output channel 34 is arranged as positive-negative voltage; when the XPOL control voltage signal 22 is low, the odd voltage output channel 33 is arranged as positive-negative voltage, and the even voltage output channel 34 is arranged as negative-positive voltage.

[0074] In the 7th mode, when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 and the even voltage output channel 34 are positive voltage; when the XPOL control voltage signal 22 is low, the odd voltage output channel 33 and the even voltage output channel 34 are negative voltage.

[0075] In the 8th mode, when the XPOL control voltage signal 22 is high, the odd voltage output channel 33 and the even voltage output channel 34 are negative voltage; when the XPOL control voltage signal 22 is low, the odd voltage output channel 33 and the even voltage output channel 34 are positive voltage.

[0076] In summary, by using the voltage mode control module 20 and the cholesteric liquid crystal display device 1 provided by the present application, the operating voltage range of the source driving unit 30 can be reduced from at least ±40V to ±20V, which reduces the design difficulty, reduces the cost, and reduces the power consumption, so that the cholesteric liquid crystal display device 1 can meet the requirements of picture clearing and holding without increasing the operating voltage of the components, and the feasibility of dynamic content display of the cholesteric liquid crystal display device 1 is increased.

[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 application can only improve in one or several aspects, and it is not necessary to solve all the technical problems listed in the prior art or background art at the same time. Those skilled in the art should understand that what is not mentioned in a claim should not be regarded as a limitation of the claim.

[0078] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A voltage mode control module for reducing the operating voltage of a cholesterol-lowering liquid crystal display device, characterized in that... The cholesterol liquid crystal display device includes a source driving unit having 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. A gap exists between the plurality of display electrodes and at least one common electrode to form a voltage that influences the liquid crystal transition state in the cholesterol liquid crystal display device. The voltage mode control module includes: A 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. The XPOL control voltage signal outputs AC voltages 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 multiple relationship. A voltage conversion circuit receives 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. When the COM_SW_EN control voltage signal is high, it represents the clear screen segment of the cholesteric liquid crystal display device, which will cause the common electrode to be in a high voltage level state. When the COM_SW_EN control voltage signal is low, it represents the display segment of the cholesteric liquid crystal display device, which will cause the common electrode to be in a low voltage level state. Specifically, when the COM_POL control voltage signal is high and the COM_SW_EN control voltage signal is high, the common electrode will be at a positive voltage of the high voltage level. When the COM_POL control voltage signal is low and the COM_SW_EN control voltage signal is high, the common electrode will be at a negative voltage of the high voltage level. This ensures that during the clearing screen segment, the odd voltage output channel or the even voltage output channel has sufficient liquid crystal reset voltage between itself and the common electrode to affect the liquid crystal and clear the screen. Conversely, when the COM_SW_EN control voltage signal is low, the common electrode will be at a low voltage level. This ensures that during the display segment, the odd voltage output channel or the even voltage output channel has a display voltage lower than the liquid crystal reset voltage between itself and the common electrode to affect the liquid crystal and display the screen.

2. The voltage mode control module according to claim 1, characterized in that: The XPOL control voltage signal outputs AC voltages corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit. This 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 AC voltages corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit. This 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, meaning 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, meaning 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... The cholesterol liquid crystal display device, which can reduce operating voltage, includes: At least one common electrode; A source driving unit having a plurality of voltage output channels to output 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 having a spacing with respect to a common electrode to form a voltage to influence the liquid crystal transition state in the cholesteric liquid crystal display device; and A 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 and 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 AC voltages 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 has a certain relationship. According to 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 outputs the corresponding voltage to the common electrode. When the COM_SW_EN control voltage signal is high, it represents the clear screen segment of the cholesterol liquid crystal display device, which will cause the common electrode to be in a high voltage level state. When the COM_SW_EN control voltage signal is low, it represents the display segment of the cholesterol liquid crystal display device, which will cause the common electrode to be in a low voltage level state. Specifically, when the COM_POL control voltage signal is high and the COM_SW_EN control voltage signal is high, the common electrode will be at a positive voltage of the high voltage level. When the COM_POL control voltage signal is low and the COM_SW_EN control voltage signal is high, the common electrode will be at a negative voltage of the high voltage level. This ensures that during the clearing screen segment, the odd voltage output channel or the even voltage output channel has sufficient liquid crystal reset voltage between itself and the common electrode to affect the liquid crystal and clear the screen. Conversely, when the COM_SW_EN control voltage signal is low, the common electrode will be at a low voltage level. This ensures that during the display segment, the odd voltage output channel or the even voltage output channel has a display voltage lower than the liquid crystal reset voltage between itself and the common electrode to affect the liquid crystal and display the screen.

7. The cholesterol liquid crystal display device according to claim 6, characterized in that: The XPOL control voltage signal outputs AC voltages corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit. This 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 cholesterol liquid crystal display device according to claim 6, characterized in that: The XPOL control voltage signal outputs AC voltages corresponding to the odd voltage output channel and the even voltage output channel through the source drive unit. This 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 cholesterol liquid crystal display device according to claim 6, characterized in that: The source drive 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 bus line arrangements in a family consisting of stripe and zigzag patterns.

10. The cholesterol 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, meaning 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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