Display screen suitable for cholesterol liquid crystal and driving method

Abstract

The invention provides a display screen suitable for cholesterol liquid crystal and a driving method. The display screen comprises a time schedule controller, a source driver, a grid driver and a common voltage generating circuit. The time schedule controller obtains image data and output setting, and outputs a source electrode control signal, a grid electrode control signal and a common voltage control signal; the source electrode driver outputs a source electrode driving signal according to the source electrode control signal, the source electrode driving signal comprises a multi-frame first alternating current signal and a multi-frame first direct current signal, and then output is paused until a next image is displayed; the gate driver outputs a gate driving signal according to the gate control signal; the common voltage generation circuit outputs a common voltage signal according to the common voltage control signal, and the common voltage signal comprises a multi-frame second AC signal and a multi-frame second DC signal; the second AC signal and the first AC signal are synchronous and opposite in polarity, and the second DC signal and the first DC signal are synchronous. The image display requirement can be met, and power consumption is reduced.

Description

Technical Field

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

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

[0003] However, the existing display screen is refreshed in real time, taking the refresh rate of 60Hz as an example, it is refreshed every 16.67ms, which is relatively power-consuming, and a large display screen consumes more power. Therefore, in order to meet the low power consumption requirements of the display screen, it is necessary to provide an improved technical solution to overcome the above technical problems existing in the prior art. Summary of the invention

[0004] In view of this, the present invention provides a display screen and a driving method suitable for cholesterol 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 cholesterol liquid crystal, comprising 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 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 comprises 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 is connected to the timing controller , outputs a gate driving 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 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.

[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 generates the common voltage signal through bias amplification of the initial voltage signal.

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

[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, according to the display color requirement 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.

[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 of 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 setting.

[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] The 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 is suspended after the first DC signal 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 is suspended after the second DC signal 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 suitable 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 driving signal according to the source control signal. The source driving 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 suspended 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 first DC signals. The second DC signal is synchronized with the first AC signal of multiple frames and has the opposite polarity. The second DC signal of multiple frames is synchronized with the first DC signal of multiple frames 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. When the cholesterol liquid crystal is in a planar texture state in the pixel, it can reflect the corresponding color light, and the pixel presents the reflected color, such as green. When the cholesterol liquid crystal is in a focal conic texture state in the pixel, it presents a foggy state. The light scatters and penetrates the cholesterol liquid crystal, and the pixel display background can present a background color such as black. Each pixel can form a display image together. Then, in the interval time after the first DC signal of the source drive signal ends, the source driver and the common voltage generation circuit both suspend the voltage output, and the pixel electrode on one side of the cholesterol liquid crystal and the common electrode on the other side are not applied with voltage. The cholesterol liquid crystal can maintain the display image for a long time without reapplying voltage, and the display screen can maintain the display image. Therefore, the display screen and driving method suitable for cholesterol liquid crystal of the present invention can meet the image display requirements, and the update rate is low and the power consumption is more saved.

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

[0018] Figure 1 The present invention 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 It is a partial structural schematic diagram of a display panel applicable to a cholesteric liquid crystal display screen according to an embodiment of the present invention.

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

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

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

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

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

[0025] The above 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 drawings. Through the description of the specific implementation methods, the technical means and effects adopted by the present invention to achieve the intended purpose can be more deeply and specifically understood. However, the drawings are only for reference and explanation purposes and are not used to limit the present invention.

[0026] Figure 1 FIG. 1 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 is suspended after the first DC signal until the next image is displayed; the gate driver 300 is connected to the timing controller 100, and outputs the 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 the 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 plurality of frames of second AC signals and a plurality of frames of second DC signals, after which the second DC signal is temporarily output 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 acting on the cholesterol liquid crystal 710 (please refer to Figure 2 ), if 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, Source Transition Signal), an output enable signal (OE, Output Enable), a line enable signal (LE, Line Enable), a clock signal (CLK, Clock Signal) and a data signal (Data, Data Signal).

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

[0029] In one embodiment, the common voltage control signal may include an output enable signal (OE, Output Enable) or a line synchronization signal (STV, Start of Vertical Signal).

[0030] In one embodiment of the present invention, the common voltage generating circuit 400 includes 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 the control module 410 can be an MCU, etc., and outputs voltage data according to a common voltage control signal triggering, 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 a common voltage signal. The amplification factor of the voltage amplifier 430 can be determined according to 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 of the source driver, which are, for example, pre-set according to the source drive signal Source required for display, including the voltage value, frame number and duration setting 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 types 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, the display screen 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 boosts or bucks the input power to the power voltage required by the above devices.

[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 It is a partial structural schematic diagram of a display panel applicable to a cholesteric liquid crystal display screen according to an embodiment of the present invention. Figure 3 It is a voltage timing diagram of a pixel in a planar texture state of a display screen suitable for cholesteric liquid crystal according to an embodiment of the present invention. Figure 41 is a voltage timing diagram of a pixel in a focal conic texture state of a display screen suitable for cholesteric liquid crystal according to an embodiment of the present invention.

[0036] like Figure 1 As shown, the display screen of the cholesterol liquid crystal of this embodiment is suitable for the timing controller 100 to obtain image data and output settings, and output source control signals, gate control signals and common voltage control signals accordingly. 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 opening and closing 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, and 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 cholesterol liquid crystal 710 of each pixel is in the planar texture state or the focal conic texture state, then each pixel presents a corresponding color, and a display image can be formed.

[0037] like Figure 2 As shown, the display screen suitable for cholesterol liquid crystal of this embodiment includes an upper substrate, a lower substrate and a liquid crystal layer arranged between the upper substrate and the lower substrate, the liquid crystal layer includes cholesterol liquid crystal 730, a common electrode 720 is arranged on the side of the upper substrate adjacent to the cholesterol liquid crystal 730, and a pixel electrode 710 is arranged on the side of the lower substrate adjacent to the cholesterol liquid crystal 730. The common electrode 720 is, for example, a whole-surface electrode, and a plurality of pixel electrodes 710 correspond to each pixel one by one. When each pixel is charged, a source driving signal is applied to the pixel electrode 710 of the pixel, and a common voltage signal is applied to the common electrode 720, then voltages are applied to the pixel electrode 710 and the common electrode 720 respectively, which will generate an electric field and affect the movement of the liquid crystal molecules of the cholesterol liquid crystal 730.

[0038] In this embodiment, the cholesterol liquid crystal molecules in the cholesterol liquid crystal 730 have three stable textures, namely, the P state (Planar, planar texture state, reflection state), the FC state (Focal Conic, focal conic state, fog state) and the H state (transparent state), wherein the FC state (Focal Conic, focal conic state, fog state) and the H state (transparent state) are both light-transmitting states. In the P state, the reflection spectrum of the cholesterol liquid crystal is in the visible spectrum, and the cholesterol liquid crystal reflects bright colored light, and its specific reflected color can be set according to the pitch of the cholesterol liquid crystal. Under the action of a certain electric field, these three states can be converted to each other, wherein the P state (Planar, planar texture state, reflection state) and the FC state (Focal Conic, focal conic state, fog state) are stable textures, and they do not require voltage to maintain, while the H state (transparent state) requires voltage to maintain.

[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 reaction speed, unstable display effect, and shortened life. Figure 3 As shown, in 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 In an 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 presents the reflected color, such as green. Figure 4 As shown, in 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 an example, the second DC signal is a positive voltage and the first DC signal is a positive voltage, or the second DC signal is a negative voltage and the first DC signal is a negative voltage, so that the cholesterol liquid crystal 730 is in a focal conic texture state, and the cholesterol liquid crystal 730 is in a foggy state when it is in a focal conic texture state in the pixel, and the light scatters and penetrates the cholesterol liquid crystal 730, so that the pixel display background can present a background color such as black. 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, and a display image can be formed. Then, in the interval time after the first DC signal of the source driving signal Source ends, the source driver 200 and the common voltage generating circuit 400 both suspend the voltage output, and the pixel electrode 710 on one side of the cholesterol liquid crystal 730 and the common electrode 720 on the other side are not applied with voltage. By utilizing the characteristic that the cholesterol liquid crystal 730 can still maintain the display image for a long time without reapplying voltage, the display screen can maintain the display image. In one embodiment, the voltage values ​​of the first AC signals of multiple frames and the voltage values ​​of the first DC signals of multiple frames 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 in 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 only relies 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 applying the first DC signal to the pixel electrode 710 and the second DC signal to the common electrode 720 lasts too long, it is easy to cause liquid crystal polarization, so 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 setting obtained by the timing controller 100, so that the source driver 200 outputs according to the setting.

[0042] In one embodiment, the multi-frame first AC signal has 15 frames, and the multi-frame first DC signal has 5 frames. For a display refresh rate of 60Hz, it only takes 20 frames, about 332ms, to send the source drive signal, and the rest of the time is static consumption. In one embodiment, the specific number of frames of the first AC signal and the specific number of frames of the first DC signal can be set in the output setting obtained by the timing controller 100, so that the source driver 200 outputs according to the setting.

[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 an embodiment of the present invention, the voltage difference between the second DC signals of multiple frames and the first DC signals of multiple frames is set according to the display color requirement of each pixel. For example, if the color display requirement of a pixel is black, the pixel electrode 710 and the common electrode 720 are driven to make the cholesterol liquid crystal 730 in 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 the color display requirement of a pixel is blue, that is, by setting the pitch of the cholesterol liquid crystal 730 so that its specific reflected color is blue, the pixel electrode 710 and the common electrode 720 are driven to make the cholesterol liquid crystal 730 in 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 color display requirement is green or red, that is, by setting the pitch of the cholesterol liquid crystal 730 so that its specific reflected color is green or red, the pixel electrode 710 and the common electrode 720 are driven to make the cholesterol liquid crystal 730 in 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 driving signal is composed of three voltage outputs of 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 thereto, and 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 of 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, wherein, if it is a blue display requirement, that is, by setting the pitch of the cholesterol liquid crystal so that its specific reflected color is blue, then the absolute values ​​of the second positive voltage and the second negative voltage can both be 26V, and if it is a green or red display requirement, that is, by setting the pitch of the cholesterol liquid crystal so that its 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, it can be adjusted accordingly according to the color display requirements, and the present invention is not limited thereto.

[0047] In one embodiment of the present invention, one frame time is set according to a display refresh rate of 60 Hz, where one frame is approximately 16.6 ms. One 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 cholesterol liquid crystal provided by the present invention is provided with a black background, and the cholesterol liquid crystal can be used to reflect green light. After applying voltage according to the driving method in the above embodiment, each pixel presents colors of green and black respectively, and a display image can be formed, and the display image can be maintained without reapplying voltage for a long time. Therefore, the display screen for cholesterol liquid crystal in this embodiment can meet the image display requirements, and has a low update rate and saves more power.

[0049] Based on the same inventive concept, an embodiment of the present invention further provides a driving method for a display screen suitable for cholesteric liquid crystal. Figure 6 FIG. 1 is a flow chart of a driving method for a display screen of a cholesterol liquid crystal according to an embodiment of the present invention. Figure 6 As shown, the driving method for a display screen suitable for cholesteric liquid crystal includes: 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; 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 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 after the first DC signal until the next image is displayed; S3, outputting a gate driving signal to a gate line of the display panel according to the gate control signal; S4, outputting 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, then each pixel presents a corresponding color, and a display image can be formed.

[0050] 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 by digital-to-analog conversion, and biasing and amplifying the initial voltage signal to generate a common voltage signal.

[0051] In one embodiment of the present invention, before acquiring the image data and the output setting, the method includes: pre-storing the image data and the output setting. The output setting may include an output setting rule of a source driver for switching between a planar texture state and a focal conic texture state.

[0052] 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 of the display screen applicable to cholesteric liquid crystal, and the repeated parts will not be repeated.

[0053] The present invention provides a display screen and a driving method suitable for cholesterol liquid crystal. 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 driving signal according to the source control signal. The source driving 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 suspended 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 includes a plurality of frames of second AC signals. The second DC signal and the multi-frame second AC signal are synchronized with the multi-frame first AC signal and have opposite polarities, 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, and the cholesterol liquid crystal 730 can reflect the corresponding color light when it is in the planar texture state in the pixel, and the pixel presents the reflected color, such as green, and the cholesterol liquid crystal 730 is in a foggy state when it is in the focal conic texture state in the pixel, and the light scatters and penetrates the cholesterol liquid crystal 730, so the pixel display background can present the background color such as black, and each pixel can form a display image together. Then, in the interval time after the first DC signal of the source driving signal ends, the source driver 200 and the common voltage generating circuit 400 both suspend the voltage output, and the pixel electrode 710 on one side of the cholesterol liquid crystal and the common electrode 720 on the other side are not applied with voltage. By utilizing the characteristic of the cholesterol liquid crystal that it can still maintain the display image for a long time without reapplying voltage, the display screen can maintain the display image. Therefore, the display screen and driving method suitable for cholesterol liquid crystal of the present invention can meet the image display requirements, and have a low update rate and save power consumption.

[0054] The above description is only 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 as above, it is not intended to limit the invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the invention. However, any simple modification, 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 alternating current signals and a plurality of frames of first direct current signals, the output of the first direct current signal being 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 driving signal to a 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 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 then 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.

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 first AC signals is greater than the duration of the multiple frames of first DC signals.

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 requirement 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 of 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: It also includes a memory (500) connected to the timing controller (100), and the memory (500) stores the image data and the output settings.

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), the first storage unit (510) storing the image data, and the second storage unit (520) storing 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 the display panel according to the source control signal, wherein the source driving signal includes a plurality of frames of first alternating current signals and a plurality of frames of first direct current signals, and the output of the first direct current signal is then 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 a 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, wherein the output of the second DC signal is then 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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