A display screen and driving method suitable for cholesteric liquid crystal

Abstract

The present invention provides a display screen and driving method suitable for cholesteric liquid crystal. The display screen includes a timing controller, a source driver, a gate driver, and a common voltage generating circuit. The timing controller obtains image data and output settings, and outputs a source control signal, a gate control signal, and a common voltage control signal. The source driver outputs a source drive signal based on the source control signal. The source drive signal includes multiple frames of a first AC signal and multiple frames of a first DC signal, and then pauses output until the next image is displayed. The gate driver outputs a gate drive signal based on the gate control signal. The common voltage generating circuit outputs a common voltage signal based on the common voltage control signal. The common voltage signal includes multiple frames of a second AC signal and multiple frames of a second DC signal. The second AC signal is synchronized with the first AC signal and has opposite polarity, and the second DC signal is synchronized with the first DC signal. The present invention can meet image display requirements and save power.

Description

Technical Field

[0001] The present invention relates to the field of display driving technology, and in particular to a display screen suitable for cholesteric liquid crystal and a driving method thereof. Background Art

[0002] With the development of the times, display screens display images and provide visual information, and their application range is becoming more and more extensive, such as advertising screens and electronic labels.

[0003] However, existing displays refresh in real time. For example, at a 60Hz refresh rate, the display refreshes every 16.67ms, which consumes a lot of power, and larger displays consume even more power. Therefore, in order to meet the low power consumption requirements of displays, it is necessary to provide an improved technical solution to overcome the above technical problems existing in the existing technology. Summary of the Invention

[0004] In view of this, the present invention provides a display screen and a driving method suitable for cholesteric liquid crystal, which can meet the image display requirements, have a low update rate, and save power consumption.

[0005] An embodiment of the present invention provides a display screen suitable for cholesteric liquid crystal, comprising a timing controller, a source driver, a gate driver, and a common voltage generating circuit; the timing controller acquires image data and output settings, and outputs a source control signal, a gate control signal, and a common voltage control signal according to the image data and the output settings; the source driver is connected to the timing controller, and outputs a source drive signal to the pixel electrode of each pixel of the display panel according to the source control signal, the source drive signal comprising a plurality of frames of first AC signals and a plurality of frames of first DC signals, the output of the first DC signal being suspended until the next image is displayed; the gate driver is connected to the timing controller , outputs a gate drive signal to the gate line of the display panel according to the gate control signal; the common voltage generating circuit is connected to the timing controller, and outputs a common voltage signal to the common electrode of the display panel according to the common voltage control signal, the common voltage signal includes a multi-frame second AC signal and a multi-frame second DC signal, and the output of the second DC signal is suspended until the next image is displayed; the multi-frame second AC signal is synchronized with the multi-frame first AC signal and has opposite polarity, and the multi-frame second DC signal is synchronized with the multi-frame first DC signal to generate a corresponding electric field so that the cholesterol liquid crystal is in a planar texture state or a focal conic texture state in each pixel to form a display image.

[0006] Specifically, the common voltage generating circuit includes a control module, a digital-to-analog converter and a voltage amplifier connected in sequence; the control module is connected to the timing controller, and triggers the output voltage data according to the common voltage control signal, the digital-to-analog converter converts the voltage data into an initial voltage signal through digital-to-analog conversion, and the voltage amplifier bias-amplifies the initial voltage signal to generate the common voltage signal.

[0007] Specifically, the duration of the multiple frames of the first AC signal is greater than the duration of the multiple frames of the first DC signal.

[0008] Specifically, the multi-frame first AC signal has a duration of 15 frames, and the multi-frame first DC signal has a duration of 5 frames.

[0009] Specifically, the voltage difference between the multi-frame second DC signal and the multi-frame first DC signal is set according to the display color requirement of each pixel.

[0010] Specifically, the source driving signal is composed of three voltage outputs: a first positive voltage, a first negative voltage and a zero volt voltage.

[0011] Specifically, the common voltage signal is composed of three voltage outputs: a second positive voltage, a second negative voltage, and a zero volt voltage.

[0012] Specifically, the display screen further includes a memory connected to the timing controller, and the memory stores the image data and the output settings.

[0013] Specifically, the memory includes a first storage unit and a second storage unit, the first storage unit stores the image data, and the second storage unit stores the output setting.

[0014] Specifically, the display screen further includes a power converter, which provides corresponding power supply voltages to the timing controller, the source driver, the gate driver, and the common voltage generating circuit.

[0015] An embodiment of the present invention also provides a driving method for a display screen suitable for cholesterol liquid crystal, comprising: acquiring image data and output settings, and outputting a source control signal, a gate control signal, and a common voltage control signal according to the image data and the output settings; outputting a source drive signal to a pixel electrode of each pixel of a display panel according to the source control signal, wherein the source drive signal includes a plurality of frames of first AC signals and a plurality of frames of first DC signals, and the output of the first DC signal is suspended until the next image is displayed; outputting a gate drive signal to a gate line of the display panel according to the gate control signal; outputting a common voltage signal to a common electrode of the display panel according to the common voltage control signal, wherein the common voltage signal includes a plurality of frames of second AC signals and a plurality of frames of second DC signals, and the output of the second DC signal is suspended until the next image is displayed; the plurality of frames of second AC signals are synchronized with the plurality of frames of first AC signals and have opposite polarities, and the plurality of frames of second DC signals are synchronized with the plurality of frames of first DC signals to generate a corresponding electric field so that the cholesterol liquid crystal is in a planar texture state or a focal conic texture state in each pixel to form a display image.

[0016] The present invention provides a display screen and a driving method for cholesterol liquid crystal. The display screen includes a timing controller, a source driver, a gate driver and a common voltage generating circuit. The timing controller outputs a source control signal, a gate control signal and a common voltage control signal according to image data and output settings. The source driver outputs a source drive signal according to the source control signal. The source drive signal includes a plurality of frames of first AC signals and a plurality of frames of first DC signals. After the first DC signal, the output is paused until the next image is displayed. The common voltage generating circuit generates a common voltage signal according to the common voltage control signal. The common voltage signal includes a plurality of frames of second AC signals and a plurality of frames of second DC signals. The second DC signal is then paused until the next image is displayed. The multiple frames of the second AC signal are synchronized with the multiple frames of the first AC signal and have opposite polarity. The multiple frames of the second DC signal are synchronized with the multiple frames of the first DC signal to generate a corresponding electric field, causing the cholesteric liquid crystal to be in a planar texture state or a focal conic texture state in each pixel. When the cholesteric liquid crystal is in the planar texture state, it can reflect light of a corresponding color, and the pixel will appear in the reflected color, such as green. When the cholesteric liquid crystal is in the focal conic texture state, it will appear in a foggy state, and light will scatter and penetrate the cholesteric liquid crystal, so that the pixel display background can appear as a background color, such as black, and each pixel can form a display image. Then, in the interval after the first DC signal of the source drive signal ends, the source driver and the common voltage generation circuit both pause voltage output, so that no voltage is applied to the pixel electrode on one side of the cholesteric liquid crystal and the common electrode on the other side. Utilizing the characteristic of the cholesteric liquid crystal that it can maintain the displayed image for a long time without reapplying voltage, the display screen can maintain the displayed image. Therefore, the display screen and driving method suitable for cholesteric liquid crystal of the present invention can meet image display requirements, have a low update rate, and save more power.

[0017] In order to make the above and other objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a circuit connection diagram of a display screen suitable for cholesteric liquid crystal according to an embodiment of the present invention.

[0019] Figure 2 FIG1 is a partial structural diagram of a display panel suitable for a cholesteric liquid crystal display screen according to an embodiment of the present invention.

[0020] Figure 3 FIG. 1 is a voltage timing diagram of a pixel in a planar textured state of a display screen suitable for cholesteric liquid crystal according to an embodiment of the present invention.

[0021] Figure 4 FIG. 1 is a voltage timing diagram of a pixel in a focal conic texture state of a cholesteric liquid crystal display screen according to an embodiment of the present invention.

[0022] Figure 5 FIG. 1 is a schematic diagram showing the effect of a display screen suitable for cholesteric liquid crystal according to an embodiment of the present invention.

[0023] Figure 6 FIG1 is a flow chart of a driving method for a cholesteric liquid crystal display screen according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following, in combination with the accompanying drawings and preferred embodiments, describes in detail the specific implementation methods, methods, steps, structures, features and effects of the gate transfer circuit and display screen proposed in the present invention.

[0025] The aforementioned and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a deeper and more detailed understanding of the technical means and effects adopted by the present invention to achieve the intended objectives can be obtained. However, the accompanying drawings are provided for reference and illustration purposes only and are not intended to limit the present invention.

[0026] Figure 1 This is a circuit connection diagram of a display screen suitable for cholesteric liquid crystal according to an embodiment of the present invention. Figure 1The embodiment of the present invention provides a display screen suitable for cholesteric liquid crystal, which includes a timing controller 100, a source driver 200, a gate driver 300 and a common voltage generating circuit 400. The timing controller 100 obtains image data and output settings, and outputs source control signals, gate control signals and common voltage control signals according to the image data and output settings; the source driver 200 is connected to the timing controller 100, and outputs source drive signals to the pixel electrodes 710 of each pixel of the display panel according to the source control signals (please refer to Figure 2 ), the source driving signal includes a plurality of frames of first AC signals and a plurality of frames of first DC signals, and the output of the first DC signal is suspended until the next image is displayed; the gate driver 300 is connected to the timing controller 100, and outputs a gate driving signal to the gate line of the display panel according to the gate control signal; the common voltage generating circuit 400 is connected to the timing controller 100, and outputs a common voltage signal to the common electrode 720 of the display panel according to the common voltage control signal (please refer to Figure 2 ), the common voltage signal includes a multi-frame second AC signal and a multi-frame second DC signal, and the second DC signal is temporarily outputted until the next image is displayed; the multi-frame second AC signal is synchronized with the multi-frame first AC signal and has opposite polarity, and the multi-frame second DC signal is synchronized with the multi-frame first DC signal to generate a corresponding electric field acting on the cholesterol liquid crystal 710 (please refer to Figure 2 ), when the cholesterol liquid crystal 710 of each pixel is in a planar texture state or a focal conic texture state, each pixel presents a corresponding color, and a display image can be formed.

[0027] In one embodiment, the source control signal may include a source transition signal (STL), an output enable signal (OE), a line enable signal (LE), a clock signal (CLK), and a data signal (Data).

[0028] In one embodiment, the gate control signal may include a start of vertical signal (STV), a gate clock signal (GCLK), and an operating mode signal (Mode).

[0029] In one embodiment, the common voltage control signal may include an output enable signal (OE) or a start of vertical signal (STV).

[0030] In one embodiment of the present invention, the common voltage generation circuit 400 includes a control module 410, a digital-to-analog converter 420, and a voltage amplifier 430, which are connected in sequence. The control module 410 is connected to the timing controller 100. The control module 410 can be an MCU, etc., and triggers the output of voltage data based on a common voltage control signal. The digital-to-analog converter 420 converts the voltage data into an initial voltage signal through digital-to-analog conversion. The voltage amplifier 430 amplifies the initial voltage signal through bias to generate a common voltage signal. The amplification factor of the voltage amplifier 430 can be determined based on the initial voltage signal and the required common voltage signal.

[0031] In one embodiment, the control module 410 performs I2C communication or SPI communication with the digital-to-analog converter 420 to transmit voltage data.

[0032] In one embodiment of the present invention, the display screen further includes a memory 500 connected to the timing controller 100, and the memory 500 stores image data and output settings. The output settings may include output setting rules for the source driver. The output setting rules are, for example, pre-set based on the source drive signal Source required for the display, including settings for the voltage values, frame number, and duration of the first AC signal and the first DC signal for switching between the planar texture state and the focal conic texture state. The memory may be a FLASH memory or other type of memory. I2C communication or SPI communication may be performed between the timing controller 100 and the memory 500 to transmit image data and output settings.

[0033] In one embodiment, the memory 500 includes a first storage unit 510 and a second storage unit 520 . The first storage unit 510 stores image data, and the second storage unit 520 stores output settings.

[0034] In one embodiment of the present invention, a display power converter 600 is provided. The power converter 600 provides corresponding power voltages to the timing controller 100, the source driver 200, the gate driver 300, the common voltage generating circuit 400, and other electronic components such as the memory 500. Specifically, the power converter 600 steps up or steps down the input power to the power voltage required by the above components.

[0035] Specifically, the following will be combined Figure 1 、 Figure 2 and Figure 3 , illustrating the implementation process of the embodiment of the present invention. Figure 2 FIG1 is a partial structural diagram of a display panel suitable for a cholesteric liquid crystal display screen according to an embodiment of the present invention. Figure 3 FIG. 1 is a voltage timing diagram of a pixel in a planar textured state of a display screen suitable for cholesteric liquid crystal according to an embodiment of the present invention. Figure 4FIG. 1 is a voltage timing diagram of a pixel in a focal conic texture state of a cholesteric liquid crystal display screen according to an embodiment of the present invention.

[0036] like Figure 1 As shown, in the display screen of the cholesteric liquid crystal of this embodiment, the timing controller 100 obtains image data and output settings, and accordingly outputs source control signals, gate control signals, and common voltage control signals. The output settings may include output setting rules of the source driver for switching between the planar texture state and the focal conic texture state. At the same time, the gate driver 300 outputs a gate drive signal to the gate line of the display panel according to the gate control signal, which can control the on and off of the thin film transistor connected to the gate line. The source driver 200 outputs a source drive signal according to the source control signal. The source drive signal is sent to each pixel through the turned-on thin film transistor. The two work together to ensure that each pixel of the display panel correctly receives the source drive signal and is charged accordingly. At the same time, the common voltage generating circuit 400 outputs a common voltage signal to the common electrode 720 of the display panel according to the common voltage control signal. According to the source drive signal output by the source driver 200 and the common voltage signal output by the common voltage generating circuit 400, the cholesteric liquid crystal 710 of each pixel is in the planar texture state or the focal conic texture state, and each pixel presents the corresponding color to form a display image.

[0037] like Figure 2 As shown, the display screen for cholesteric liquid crystal of this embodiment includes an upper substrate, a lower substrate, and a liquid crystal layer disposed between the upper and lower substrates. The liquid crystal layer includes cholesteric liquid crystal 730. A common electrode 720 is disposed on the side of the upper substrate adjacent to the cholesteric liquid crystal 730, and a pixel electrode 710 is disposed on the side of the lower substrate adjacent to the cholesteric liquid crystal 730. The common electrode 720 is, for example, a full-surface electrode, and a plurality of pixel electrodes 710 correspond one-to-one to each pixel. When each pixel is charged, a source drive signal is applied to the pixel electrode 710 of the pixel, and a common voltage signal is applied to the common electrode 720. Voltages are then applied to the pixel electrode 710 and the common electrode 720, respectively, generating an electric field that affects the movement of the liquid crystal molecules of the cholesteric liquid crystal 730.

[0038] In this embodiment, the cholesteric liquid crystal molecules in the cholesteric liquid crystal 730 have three stable textures: the P state (planar, reflective), the FC state (focal conic, foggy), and the H state (transparent). Both the FC state (focal conic, foggy) and the H state (transparent) are light-transmitting. In the P state, the reflection spectrum of the cholesteric liquid crystal is within the visible spectrum, and the cholesteric liquid crystal reflects bright colored light. The specific reflected color can be set based on the helical pitch of the cholesteric liquid crystal. Under a certain electric field, these three states can transition between each other. The P state (planar, reflective) and the FC state (focal conic, foggy) are stable textures and do not require voltage to maintain, while the H state (transparent) does.

[0039] like Figure 3 and Figure 4 As shown, the source driving signal Source includes multiple frames of first AC signals and multiple frames of first DC signals, and the output is suspended after the first DC signal until the next image is displayed; the common voltage signal AC Vcom includes multiple frames of second AC signals and multiple frames of second DC signals, and the output is suspended after the second DC signal until the next image is displayed. In the time period from t1 to t2, the multiple frames of second AC signals are synchronized with the multiple frames of first AC signals and have opposite polarities, which is conducive to forming a relatively large AC voltage difference, thereby forming a high-voltage AC electric field and applying it to the cholesterol liquid crystal 730, which can effectively improve the arrangement of cholesterol molecules and avoid the occurrence of liquid crystal polarization, which may cause adverse consequences such as decreased response speed, unstable display effect, and shortened life. Figure 3 As shown, during the time period from t2 to t3, the multi-frame second DC signal is synchronized with the multi-frame first DC signal to generate a corresponding electric field acting on the cholesterol liquid crystal 730, and the multi-frame second DC signal forms a high voltage difference with the multi-frame first DC signal. Figure 3 For example, the second DC signal is a positive voltage and the first DC signal is a negative voltage. Alternatively, the second DC signal is a negative voltage and the first DC signal is a positive voltage, so that the cholesterol liquid crystal 730 is in a planar texture state. When the cholesterol liquid crystal 730 is in a planar texture state in the pixel, it can reflect the corresponding color light, and the pixel will show the reflected color, for example, green. Figure 4 As shown, during the time period from t2 to t3, the multi-frame second DC signal is synchronized with the multi-frame first DC signal to generate a corresponding electric field acting on the cholesterol liquid crystal 730, and the multi-frame second DC signal forms a low voltage difference with the multi-frame first DC signal. Figure 4In one example, the second DC signal is a positive voltage and the first DC signal is a positive voltage. Alternatively, the second DC signal is a negative voltage and the first DC signal is a negative voltage. This causes the cholesteric liquid crystal 730 to be in a focal conic texture state. When the cholesteric liquid crystal 730 is in the focal conic texture state in the pixel, it appears foggy. Light scatters and penetrates the cholesteric liquid crystal 730, and the pixel display background can appear as a background color, such as black. If the cholesteric liquid crystal 710 in each pixel is in a planar texture state or a focal conic texture state, each pixel will appear in the corresponding color, forming a displayed image. Then, in the interval after the first DC signal of the source drive signal Source ends, the source driver 200 and the common voltage generation circuit 400 both suspend voltage output. No voltage is applied to the pixel electrode 710 on one side of the cholesteric liquid crystal 730 and the common electrode 720 on the other side. By utilizing the characteristic of the cholesteric liquid crystal 730 that it can maintain a displayed image for a long time without reapplying voltage, the display screen can maintain the displayed image. In one embodiment, the voltage values ​​of the multi-frame first AC signals and the voltage values ​​of the multi-frame first DC signals can be set in the output settings acquired by the timing controller 100 , so that the source driver 200 outputs according to the settings.

[0040] Therefore, the display screen suitable for cholesterol liquid crystal in the embodiment of the present invention can meet the image display requirements. The display screen consumes energy only during the time period when the source driving signal is a multi-frame first AC signal and a multi-frame first DC signal. The rest of the time is static consumption and the image display relies only on the characteristics of cholesterol liquid crystal, so the update rate is low and power consumption is more saved.

[0041] In one embodiment of the present invention, the duration of the multi-frame first AC signal is greater than the duration of the multi-frame first DC signal. Because the fixed electric field formed by the first DC signal applied to the pixel electrode 710 and the second DC signal applied to the common electrode 720 lasts too long, which can easily cause liquid crystal polarization, the duration of the first DC signal is set to be relatively short. In one embodiment, the duration of the multi-frame first AC signal and the duration of the multi-frame first DC signal can be set in the output settings obtained by the timing controller 100, so that the source driver 200 outputs according to the settings.

[0042] In one embodiment, multiple frames of the first AC signal have a duration of 15 frames, and multiple frames of the first DC signal have a duration of 5 frames. For a display refresh rate of 60 Hz, sending the source drive signal only requires 20 frames, approximately 332 ms, with the remaining time being static consumption. In one embodiment, the specific number of frames of the first AC signal and the first DC signal can be set in the output settings obtained by the timing controller 100, so that the source driver 200 outputs according to the settings.

[0043] In one embodiment of the present invention, the multiple frames of first AC signals and the multiple frames of second AC signals are rectangular square wave signals.

[0044] In one embodiment of the present invention, the voltage difference between the second DC signal of multiple frames and the first DC signal of multiple frames is set according to the display color requirement of each pixel. For example, if a pixel is required to display black, the pixel electrode 710 and the common electrode 720 are driven to put the cholesteric liquid crystal 730 into a focal conic texture state, and a low voltage difference is formed between the multi-frame second DC signal and the multi-frame first DC signal. If a pixel is required to display blue, that is, by setting the pitch of the cholesteric liquid crystal 730 so that it specifically reflects blue, the pixel electrode 710 and the common electrode 720 are driven to put the cholesteric liquid crystal 730 into a planar texture state, and a high voltage difference is formed between the multi-frame second DC signal and the multi-frame first DC signal, for example, the second DC signal is 15V and the first DC signal is -26V. If the display color is required to be green or red, that is, by setting the pitch of the cholesteric liquid crystal 730 so that it specifically reflects green or red, the pixel electrode 710 and the common electrode 720 are driven to put the cholesteric liquid crystal 730 into a planar texture state, and another high voltage difference is formed between the multi-frame second DC signal and the multi-frame first DC signal, for example, the second DC signal is 15V and the first DC signal is -18V.

[0045] In one embodiment of the present invention, the source drive signal is composed of three voltage outputs: a first positive voltage, a first negative voltage, and a zero volt voltage. In one embodiment, the absolute values ​​of the first positive voltage and the first negative voltage are equal. For example, the first positive voltage is +15V and the first negative voltage is -15V, that is, the absolute values ​​of the first positive voltage and the first negative voltage are 15V, but the present invention is not limited to this. The absolute values ​​of the first positive voltage and the first negative voltage may also be 14V or 16V, etc.

[0046] In one embodiment of the present invention, the common voltage signal is composed of three voltage outputs: a second positive voltage, a second negative voltage, and a zero volt voltage. In one embodiment, the absolute values ​​of the second positive voltage and the second negative voltage are equal. For example, the second positive voltage is +18V and the second negative voltage is -18V, that is, the absolute values ​​of the second positive voltage and the second negative voltage are both 18V. If the display requirement is blue, that is, the pitch of the cholesterol liquid crystal is set so that the specific reflected color is blue, then the absolute values ​​of the second positive voltage and the second negative voltage can both be 26V. If the display requirement is green or red, that is, the pitch of the cholesterol liquid crystal is set so that the specific reflected color is green or red, then the absolute values ​​of the second positive voltage and the second negative voltage can both be 18V. That is, the corresponding adjustment can be made according to the color display requirement, and the present invention is not limited thereto.

[0047] In one embodiment of the present invention, the frame time is set according to a display refresh rate of 60 Hz, where one frame is approximately 16.6 ms. The frame time may also be set according to other display refresh rates.

[0048] Figure 5 FIG. 1 is a schematic diagram showing the effect of a display screen suitable for cholesteric liquid crystal according to an embodiment of the present invention. Figure 5 As shown, the display screen for cholesteric liquid crystal provided by the present invention has a black background. The cholesteric liquid crystal is capable of reflecting green light. When voltage is applied according to the driving method described in the above embodiment, each pixel displays green and black, forming a display image. The displayed image can be maintained even without reapplying voltage for a long period of time. Therefore, the display screen for cholesteric liquid crystal provided by this embodiment can meet image display requirements, has a low refresh rate, and is more energy-efficient.

[0049] Based on the same inventive concept, an embodiment of the present invention further provides a driving method for a display screen of cholesteric liquid crystal. Figure 6 FIG. 1 is a flow chart of a driving method for a display screen of cholesteric liquid crystal according to an embodiment of the present invention. Figure 6 As shown, the driving method for the display screen of the cholesteric liquid crystal includes:

[0050] S1, acquiring image data and output settings, and outputting source control signals, gate control signals, and common voltage control signals according to the image data and output settings;

[0051] S2, outputting a source driving signal to the pixel electrode 710 of each pixel of the display panel according to the source control signal, wherein the source driving signal includes a first AC signal of multiple frames and a first DC signal of multiple frames, and the output of the first DC signal is suspended after the first DC signal until the next image is displayed;

[0052] S3, outputting a gate driving signal to the gate line of the display panel according to the gate control signal;

[0053] S4, outputs a common voltage signal to the common electrode 720 of the display panel according to the common voltage control signal, the common voltage signal includes a multi-frame second AC signal and a multi-frame second DC signal, and the output of the second DC signal is suspended until the next image is displayed; the multi-frame second AC signal is synchronized with the multi-frame first AC signal and has opposite polarity, and the multi-frame second DC signal is synchronized with the multi-frame first DC signal to generate a corresponding electric field acting on the cholesterol liquid crystal 710. The cholesterol liquid crystal 710 of each pixel is in a planar texture state or a focal conic texture state, and each pixel presents a corresponding color to form a display image.

[0054] In one embodiment of the present invention, a common voltage signal is output to a common electrode of a display panel according to a common voltage control signal, including: triggering output voltage data according to the common voltage control signal, converting the voltage data into an initial voltage signal through digital-to-analog conversion, and bias-amplifying the initial voltage signal to generate a common voltage signal.

[0055] In one embodiment of the present invention, before acquiring the image data and output settings, the method includes pre-storing the image data and output settings. The output settings may include output setting rules of a source driver for switching between a planar texture state and a focal conic texture state.

[0056] The implementation of the driving method of the display screen applicable to cholesteric liquid crystal in this embodiment can refer to the above-mentioned embodiment applicable to the display screen applicable to cholesteric liquid crystal, and the repeated parts are not repeated here.

[0057] The present invention provides a display screen and a driving method for cholesterol liquid crystal, wherein the display screen includes a timing controller 100, a source driver 200, a gate driver 300, and a common voltage generating circuit 400; the timing controller 100 outputs a source control signal, a gate control signal, and a common voltage control signal according to image data and output settings; the source driver 200 outputs a source drive signal according to the source control signal, the source drive signal including a plurality of frames of first AC signals and a plurality of frames of first DC signals, and the output is paused after the first DC signal until the next image is displayed; the common voltage generating circuit 400 generates a common voltage signal according to the common voltage control signal, the common voltage signal including a plurality of frames of second AC signals. The multi-frame second AC signal and the multi-frame second DC signal are synchronized with the multi-frame first AC signal and have opposite polarity. The multi-frame second DC signal is synchronized with the multi-frame first DC signal to generate a corresponding electric field, causing the cholesteric liquid crystal to be in a planar texture state or a focal conic texture state in each pixel. When the cholesteric liquid crystal 730 is in the planar texture state in the pixel, it can reflect light of the corresponding color, and the pixel will appear in the reflected color, such as green. When the cholesteric liquid crystal 730 is in the focal conic texture state in the pixel, it will appear in a foggy state. Light scatters and penetrates the cholesteric liquid crystal 730, and the pixel display background can appear in the background color, such as black. The pixels can form a display image together. Then, in the interval after the first DC signal of the source drive signal ends, the source driver 200 and the common voltage generation circuit 400 both suspend voltage output. Therefore, no voltage is applied to the pixel electrode 710 on one side of the cholesteric liquid crystal and the common electrode 720 on the other side. By utilizing the characteristic of the cholesteric liquid crystal that it can maintain the displayed image for a long time without re-applying voltage, the display screen can maintain the displayed image. Therefore, the display screen and driving method applicable to cholesteric liquid crystal of the present invention can meet the image display requirements, and has a low update rate and saves more power consumption.

[0058] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the technical contents disclosed above without departing from the scope of the technical solution of the invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the invention without departing from the content of the technical solution of the invention are still within the scope of the technical solution of the present invention.

Claims

1. A display screen suitable for cholesteric liquid crystal, characterized in that: include: A timing controller (100), the timing controller (100) acquiring image data and output settings, and outputting a source control signal, a gate control signal, and a common voltage control signal according to the image data and the output settings; A source driver (200), the source driver (200) being connected to the timing controller (100), and outputting a source drive signal to a pixel electrode (710) of each pixel of the display panel according to the source control signal, the source drive signal comprising a plurality of frames of first AC signals and a plurality of frames of first DC signals, wherein the output of the first DC signal is subsequently suspended until the next image is displayed; A gate driver (300), the gate driver (300) being connected to the timing controller (100) and outputting a gate drive signal to the gate line of the display panel according to the gate control signal; A common voltage generating circuit (400) is connected to the timing controller (100) and outputs a common voltage signal to the common electrode (720) of the display panel according to the common voltage control signal, wherein the common voltage signal includes a multi-frame second AC signal and a multi-frame second DC signal, and the output of the second DC signal is suspended until the next image is displayed; the multi-frame second AC signal is synchronized with the multi-frame first AC signal and has opposite polarity, and the multi-frame second DC signal is synchronized with the multi-frame first DC signal to generate a corresponding electric field so that the cholesterol liquid crystal (730) is in a planar texture state or a focal conic texture state in each pixel, thereby forming a display image.

2. The display screen suitable for cholesteric liquid crystal according to claim 1, characterized in that: The common voltage generating circuit (400) comprises a control module (410), a digital-to-analog converter (420), and a voltage amplifier (430) connected in sequence; The control module (410) is connected to the timing controller (100), and triggers output voltage data according to the common voltage control signal. The digital-to-analog converter (420) converts the voltage data into an initial voltage signal through digital-to-analog conversion, and the voltage amplifier (430) amplifies the initial voltage signal through bias to generate the common voltage signal.

3. The display screen suitable for cholesteric liquid crystal according to claim 1, characterized in that: The duration of the multiple frames of the first AC signal is greater than the duration of the multiple frames of the first DC signal.

4. The display screen suitable for cholesteric liquid crystal according to claim 3, characterized in that: The multi-frame first AC signal has a duration of 15 frames, and the multi-frame first DC signal has a duration of 5 frames.

5. The display screen suitable for cholesteric liquid crystal according to claim 1, characterized in that: According to the display color requirements of each pixel, the voltage difference between the plurality of frames of the second DC signal and the plurality of frames of the first DC signal is set.

6. The display screen suitable for cholesteric liquid crystal according to claim 1, characterized in that: The source driving signal is composed of three voltage outputs: a first positive voltage, a first negative voltage and a zero volt voltage.

7. The display screen suitable for cholesteric liquid crystal according to claim 1, characterized in that: The common voltage signal is composed of three voltage outputs: a second positive voltage, a second negative voltage, and a zero volt voltage.

8. The display screen suitable for cholesteric liquid crystal according to claim 1, characterized in that: The device further comprises a memory (500) connected to the timing controller (100), wherein the memory (500) stores the image data and the output setting.

9. The display screen suitable for cholesteric liquid crystal according to claim 8, characterized in that: The memory (500) includes a first storage unit (510) and a second storage unit (520), wherein the first storage unit (510) stores the image data and the second storage unit (520) stores the output setting.

10. A driving method for a display screen of cholesteric liquid crystal, characterized in that: include: Acquire image data and output settings, and output source control signals, gate control signals, and common voltage control signals according to the image data and output settings; Outputting a source driving signal to a pixel electrode (710) of each pixel of a display panel according to the source control signal, wherein the source driving signal includes a first alternating current signal of multiple frames and a first direct current signal of multiple frames, and the output of the first direct current signal is subsequently suspended until the next image is displayed; outputting a gate driving signal to a gate line of the display panel according to the gate control signal; A common voltage signal is output to the common electrode (720) of the display panel according to the common voltage control signal, wherein the common voltage signal includes a plurality of frames of second AC signals and a plurality of frames of second DC signals, and the output of the second DC signal is suspended until the next image is displayed; the plurality of frames of second AC signals are synchronized with the plurality of frames of first AC signals and have opposite polarities, and the plurality of frames of second DC signals are synchronized with the plurality of frames of first DC signals to generate a corresponding electric field so that the cholesterol liquid crystal (730) is in a planar texture state or a focal conic texture state in each pixel, thereby forming a display image.

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