Driving system of active matrix type cholesterol liquid crystal display device and handwritten image display method thereof

Abstract

The invention relates to a driving system of an active matrix type cholesterol liquid crystal display device and a handwritten image display method thereof. The handwritten image display method is used for controlling an active matrix type cholesterol liquid crystal display device, and comprises the following steps of: generating a voltage control instruction, a grid control instruction and an image display instruction according to handwritten image parameter data, a data enabling signal and a vertical synchronous signal; generating a gate driving voltage and a plurality of data driving voltages according to the voltage control instruction; executing a handwritten image display program, outputting the grid driving voltage to control a plurality of display units of the active matrix type cholesterol liquid crystal display device to be turned on or turned off, controlling a switching time sequence of the plurality of display units according to the grid control instruction, and outputting the plurality of data driving voltages to the turned-on plurality of display units, therefore, a handwritten image is displayed.

Description

Technical Field

[0001] A driving system and display method for a cholesterol liquid crystal display device, particularly a driving system and handwritten image display method for an active matrix cholesterol liquid crystal display device. Background Technology

[0002] Cholesteric liquid crystal displays (ChLCDs) exhibit bistable liquid crystal display characteristics, encompassing two stable states: a planar texture and a focal conic texture. When the cholesteric liquid crystal is in a planar texture, it reflects light of a specific wavelength, also known as the reflective state or bright state. Conversely, when the cholesteric liquid crystal is in a focal conic texture, light is scattered and transmitted through the black absorption film attached to the back of the display, also known as the scattering state or dark state.

[0003] When a driving voltage is applied to cholesteric liquid crystal, the liquid crystal molecules are affected by the electric field and align, rotate, and produce different arrangements, causing the cholesteric liquid crystal to transform into a planar or focal conical state. By applying different driving voltages to make the cholesteric liquid crystal exhibit a planar and focal conical state coexisting in a certain proportion, the reflectivity of the cholesteric liquid crystal can be changed, thereby allowing the cholesteric liquid crystal to display different gray levels and colors. Due to its bistable characteristic, if the driving voltage is stopped, the cholesteric liquid crystal will stably maintain its original state. In other words, only when a driving voltage is applied will the cholesteric liquid crystal display device change the displayed image due to the changes in liquid crystal molecules. If the driving voltage is stopped, the cholesteric liquid crystal display device will continue to maintain the original displayed image. Therefore, compared with other display devices, cholesteric liquid crystal display devices are more commonly used for still image display.

[0004] A common passive matrix cholesteric liquid crystal display (PM ChLCD) device has a display panel, a scan driver, a data driver, multiple scan lines and multiple data lines. The display panel has multiple display units. The scan driver is connected to the multiple scan lines. Each scan line is arranged horizontally and connects to each display unit located on the same horizontal line. The data driver is connected to the multiple data lines. Each data line is arranged vertically and connects to each display unit located on the same vertical line, so that each display unit is connected to one scan line in the horizontal direction and one data line in the vertical direction.

[0005] When displaying static images, the passive matrix Cholesterol liquid crystal display device (CLC) drives each scan line sequentially according to the order of the multiple scan lines. The data driver, in coordination with the driving sequence of the multiple scan lines, inputs a corresponding data signal to each display unit via multiple data lines when each scan line is driven. Because the CLC requires sequential driving of each scan line and uses passive components, updating the display image takes a considerable amount of time. If this CLC displays dynamic images, the excessively long update time between different images can easily lead to discontinuous display, affecting the user's viewing experience. Furthermore, if this CLC is applied to handwriting display, the long update time can also cause handwriting traces to fail to display in real time.

[0006] The use of passive components also results in a generally low contrast ratio for the passive matrix cholesteric liquid crystal display device. This requires increasing the time or frequency of the data driver inputting the data signal to each display unit to allow the cholesteric liquid crystal sufficient time to enter the focal cone state, making the dark areas of the display darker and achieving the desired contrast ratio. This further increases the update time required for the display, making the passive matrix cholesteric liquid crystal display device even more difficult to use for real-time handwriting display.

[0007] On the other hand, the passive matrix cholesteric liquid crystal display device is controlled by a timing controller. In addition to storing complete screen data and performing image processing on the screen data to generate corresponding timing signals and data signals, the timing controller also needs to store corresponding timing data and data signals in order to repeatedly input the data signals into each liquid crystal cell through the data driver to improve the brightness of the display screen. For this reason, the timing controller needs to have a large built-in memory or be connected to a memory, which makes it impossible to reduce the installation cost of the timing controller and further reduce the overall size of the device, making it difficult to promote the miniaturization of the driving device of the cholesteric liquid crystal display device.

[0008] In addition, when a voltage of the same polarity is continuously applied to a cholesterol liquid crystal display device, the liquid crystal molecules are easily polarized by the voltage, causing the liquid crystal molecules to have their own bias voltage. This results in the deflection angle not being as expected, causing the cholesterol liquid crystal display device to produce ghosting, uneven brightness, and display abnormalities.

[0009] Considering the long screen update time required by the current driving method of cholesteric liquid crystal display devices, which cannot present images in real time and quickly, and easily affects the user's viewing experience, it is difficult for cholesteric liquid crystal display devices to be further applied to real-time handwriting display. In addition, the current driving method is prone to polarization of liquid crystal molecules, which reduces the lifespan of cholesteric liquid crystal display devices. Furthermore, the high cost of driving equipment means that there is room and necessity for further improvement in the driving technology of current cholesteric liquid crystal display devices. Summary of the Invention

[0010] In view of this, the present invention provides a driving system for an active matrix cholesteric liquid crystal display device and a driving method for handwriting image display. By improving the screen update speed of the active matrix cholesteric liquid crystal display device, the active matrix cholesteric liquid crystal display device can be used for real-time handwriting display. Furthermore, by alternately driving the active matrix cholesteric liquid crystal display device with driving voltages of opposite polarity, the polarization phenomenon of liquid crystal molecules is avoided, thereby improving the service life of the active matrix cholesteric liquid crystal display device.

[0011] To achieve the aforementioned objectives, the present invention provides a driving system for an active-matrix cholesteric liquid crystal display device, used to control an active-matrix cholesteric liquid crystal display device. The active-matrix cholesteric liquid crystal display device includes a gate driving element, a data driving element, and a plurality of display units electrically connected to the gate driving element and the data driving element respectively. The driving system of the active-matrix cholesteric liquid crystal display device includes:

[0012] A timing controller is connected to the active matrix Cholesterol liquid crystal display device, and generates a voltage control command, a gate control command and an image display command based on a handwritten image parameter data, a data enable signal and a vertical synchronization signal. The controller outputs the gate control command to the gate driving element and the image display command to the data driving element, and controls the active matrix Cholesterol liquid crystal display device to execute a handwritten image display program.

[0013] A power supply module is connected to the timing controller and the active matrix cholesterol liquid crystal display device. According to the voltage control command, it generates a gate drive voltage and multiple data drive voltages, and outputs the gate drive voltage to the gate drive element and the multiple data drive voltages to the data drive element.

[0014] In the handwritten image display program, the timing controller controls the timing of the gate driving element outputting the gate driving voltage by the gate control command, and controls the data driving element to output the multiple data driving voltages by the image display command, so that the active matrix cholesteric liquid crystal display device displays a handwritten image.

[0015] The present invention further provides a handwritten image display method for an active matrix cholesteric liquid crystal display device, used to control an active matrix cholesteric liquid crystal display device, the handwritten image display method comprising:

[0016] A1. Based on a handwritten image parameter data, a data enable signal and a vertical synchronization signal, generate a voltage control command, a gate control command and an image display command;

[0017] A2. Generate a gate drive voltage and multiple data drive voltages according to the voltage control command;

[0018] A3. Execute a handwritten image display program, output the gate driving voltage to control the opening or closing of multiple display units of the active matrix cholesteric liquid crystal display device, control the switching timing of the multiple display units according to the gate control command, and output the multiple data driving voltages to the multiple display units that are turned on, so that the active matrix cholesteric liquid crystal display device displays a handwritten image.

[0019] In this invention, the timing controller controls the operation of the active matrix Cholesterol Liquid Crystal Display (AMLCD) device through the gate control command and the image display command, enabling the AMLCD device to display a handwritten image. The power supply module generates the gate driving voltage and the plurality of data driving voltages supplied to the AMLCD device according to the voltage control command. Compared to conventional passive matrix Cholesterol liquid crystal displays and their driving methods, this active matrix Cholesterol liquid crystal display uses active elements. The time required to update the display image of this active matrix Cholesterol liquid crystal display is shorter than that of a passive matrix Cholesterol liquid crystal display. Furthermore, under the same driving voltage, the contrast ratio of the image presented by this active matrix Cholesterol liquid crystal display is higher than that of a passive matrix Cholesterol liquid crystal display. The timing controller does not need to repeatedly drive the active matrix Cholesterol liquid crystal display with the same data driving voltage. Therefore, the timing controller does not need to add additional memory to store the complete dynamic image. In addition to saving costs, because the timing controller does not need to repeatedly drive the active matrix Cholesterol liquid crystal display with the same data driving voltage to improve the image contrast, the time required to update the display image of the active matrix Cholesterol liquid crystal display is reduced, which helps to speed up the display and update speed of handwritten images and provides users with a faster and more stable handwriting experience. Attached Figure Description

[0020] Figure 1 : A block diagram of the driving system and the active matrix cholesterol liquid crystal display device of the present invention.

[0021] Figure 2 : A schematic diagram of the driving system of the active matrix cholesterol liquid crystal display device of the present invention and another block diagram of the active matrix cholesterol liquid crystal display device.

[0022] Figure 3A : A schematic diagram of the signal waveform of the image control signal in the driving system of the active matrix cholesterol liquid crystal display device of the present invention.

[0023] Figure 3B : A schematic diagram of the signal waveform of the vertical synchronization signal in the driving system of the active matrix cholesterol liquid crystal display device of the present invention.

[0024] Figure 3C : A schematic diagram of the signal waveform of the data enable signal in the driving system of the active matrix cholesterol liquid crystal display device of the present invention.

[0025] Figure 3D : A schematic diagram of the voltage waveform of the data driving voltage received by one of the display units in the driving system of the active matrix cholesterol liquid crystal display device of the present invention.

[0026] Figure 3E : A schematic diagram of the voltage waveform of the common electrode voltage corresponding to one of the display units in the driving system of the active matrix cholesterol liquid crystal display device of the present invention.

[0027] Figure 3F : A schematic diagram of the voltage waveform across the voltage of one of the display units in the driving system of the active matrix cholesterol liquid crystal display device of the present invention.

[0028] Figure 4A : A schematic diagram of the signal waveform of the image control signal when the driving system of the active matrix cholesterol liquid crystal display device of the present invention executes the handwriting program.

[0029] Figure 4B : A schematic diagram of the signal waveform of the vertical synchronization signal when the driving system of the active matrix cholesterol liquid crystal display device of the present invention executes a handwritten program.

[0030] Figure 4C : A schematic diagram of the signal waveform of the data enable signal when the drive system of the active matrix cholesterol liquid crystal display device of the present invention executes a handwritten program.

[0031] Figure 4D : A schematic diagram of the voltage waveform of the data driving voltage received by one of the display units when the driving system of the active matrix cholesterol liquid crystal display device of the present invention executes a handwritten program.

[0032] Figure 4E: A schematic diagram of the voltage waveform of the common electrode voltage of one of the display units when the driving system of the active matrix cholesterol liquid crystal display device of the present invention executes the handwritten program.

[0033] Figure 4F This is a schematic diagram of the voltage waveform across one of the display units when the driving system of the active matrix cholesterol liquid crystal display device of the present invention executes a handwritten program.

[0034] Figure 5 Another block diagram of the driving system of the active matrix cholesterol liquid crystal display device of the present invention.

[0035] Figure 6 Another block diagram of the driving system of the active matrix cholesterol liquid crystal display device of the present invention.

[0036] Figure 7 Another block diagram of the driving system of the active matrix cholesterol liquid crystal display device of the present invention.

[0037] Figure 8A : A schematic diagram of a background image displayed by an active matrix cholesterol liquid crystal display device.

[0038] Figure 8B : A schematic diagram of a handwritten image displayed on an active matrix cholesterol liquid crystal display device.

[0039] Figure 8C A schematic diagram of an active matrix Cholesterol LCD display device showing background images and handwritten images.

[0040] Figure 9A The flowchart of the handwritten image display method of the active matrix cholesterol liquid crystal display device of the present invention is shown.

[0041] Figure 9B Another step of the handwritten image display method of the active matrix cholesterol liquid crystal display device of the present invention is shown in the flowchart. Detailed Implementation

[0042] Please refer to Figures 1 to 3FAs shown, the driving system 1 of the Active Matrix Cholesteric Liquid Crystal Display (AM ChLCD) of the present invention is used to drive an Active Matrix Cholesteric Liquid Crystal Display 100 to display handwritten images. The driving system 1 of the Active Matrix Cholesteric Liquid Crystal Display includes a timing controller IC (TCON) 10 and a power supply module 20. The timing controller 10 can be an electronic device with computing and processing functions, such as a processor or microcontroller. The power supply module 20 can be a power supply unit. The Active Matrix Cholesteric Liquid Crystal Display 100 can be a touch display screen.

[0043] The timing controller 10 is connected to the active matrix cholesteric liquid crystal display device 100 and has a power control port 11, a gate control port 12 and a data control port 13. The timing controller 10 generates a voltage control command Iv, a gate control command Ig and an image display command Id based on a background image parameter data, a data enable signal DE and a vertical synchronization signal Vsync. The timing controller 10 also generates the voltage control command Iv, the gate control command Ig and the image display command Id based on a handwritten image parameter data, the data enable signal DE and the vertical synchronization signal Vsync.

[0044] The timing controller 10 transmits the voltage control command Iv to the power supply module 20 through the power control port 11, transmits the gate control command Ig to the active matrix cholesteric liquid crystal display device 100 through the gate control port 12, and outputs the image display command Id to the active matrix cholesteric liquid crystal display device 100 through the data control port 13. The timing controller 10 controls the active matrix Cholesterol liquid crystal display device 100 to execute a screen reset program and a background image display program by using the voltage control command Iv, the gate control command Ig, and the image display command Id corresponding to the background image parameter data, so as to reset a display screen of the active matrix Cholesterol liquid crystal display device 100 and make the active matrix Cholesterol liquid crystal display device 100 display a background image from the display screen; on the other hand, the timing controller 10 controls the active matrix Cholesterol liquid crystal display device 100 to execute a handwriting image display program by using the voltage control command Iv, the gate control command Ig, and the image display command Id corresponding to the handwriting parameter data, so as to make the active matrix Cholesterol liquid crystal display device 100 display a handwriting image corresponding to the user's handwriting operation from the display screen.

[0045] The background image is a background image presented by the active-matrix Cholesterol Liquid Crystal Display 100 to the user for handwriting operations, such as a notepad image, a draft paper image, an e-book page, a photo, etc. The background image parameter data includes a voltage parameter corresponding to each pixel in the background image; the handwriting image parameter data includes a voltage parameter corresponding to each pixel in the handwriting image; the voltage control command Iv includes multiple voltage values ​​required to drive the active-matrix Cholesterol Liquid Crystal Display 100 to reset the display screen, display the background image, or display the handwriting image; the gate control command Ig includes the update timing of each pixel in the background image or the handwriting image when controlling the active-matrix Cholesterol Liquid Crystal Display 100 to display the background image or the handwriting image; the image display command Id includes the image format information of the background image or the handwriting image, and the voltage value corresponding to each pixel in the background image or the handwriting image when driving the active-matrix Cholesterol Liquid Crystal Display 100 to display the background image or the handwriting image.

[0046] The data enable signal DE is used to define the time period of each frame. The data enable signal DE indicates the start and end of a frame, and the refresh rate of the active matrix Cholesterol liquid crystal display device 100 can be changed by adjusting the duration of each frame. The timing controller 10 uses the data enable signal DE as a timing reference for controlling the active matrix Cholesterol liquid crystal display device 100 to display static images, and generates the corresponding gate control command Ig, image display command Id, and voltage control command Iv according to the data enable signal DE.

[0047] In one embodiment, the timing controller 10 converts the image display instruction ID into a Mini Low-Voltage Differential Signaling (Mini-LVDS) signal and transmits it to the active matrix cholesterol liquid crystal display device 100.

[0048] In one embodiment, the timing controller 10 can preset the duration or number of frames of the screen reset procedure and the background image display procedure. When displaying the background image, if the timing controller 10 determines that the vertical synchronization signal Vsync is at a vertical synchronization trigger potential and the data enable signal DE is at a data enable trigger potential, the timing controller 10 first controls the active matrix Cholesterol liquid crystal display device 100 to execute the screen reset procedure. After the screen reset procedure ends, and the data enable signal DE is at the enable trigger potential, the timing controller 10 controls the active matrix Cholesterol liquid crystal display device 100 to execute the background image display procedure.

[0049] In one embodiment, when displaying the background image, the timing controller 10 determines whether to execute the screen reset procedure or the background image display procedure based on the different potentials of the data enable signal DE. When the timing controller 10 determines that the vertical synchronization signal Vsync is at the vertical synchronization trigger potential and the data enable signal DE is at a first potential, the timing controller 10 first controls the active matrix Cholesterol liquid crystal display device 100 to execute the screen reset procedure. When the timing controller 10 determines that the data enable signal DE is at a second potential, the timing controller 10 controls the active matrix Cholesterol liquid crystal display device 100 to execute the background image display procedure.

[0050] In one embodiment, when the handwritten image is displayed, when the timing controller 10 determines that the data enable signal DE is at a consistent trigger potential, the timing controller 10 controls the active matrix Cholesterol Liquid Crystal Display 100 to execute the handwritten image display program.

[0051] The power supply module 20 is signal-connected to the timing controller 10 and electrically connected to the active matrix cholesterol liquid crystal display device 100. The power supply module 20 has a power communication port 21, a gate drive voltage port 22, multiple data drive voltage ports 23, and a common electrode voltage port 24. The power communication port 21 is connected to the power control port 11 of the timing controller 10, and the power supply module 20 receives the voltage control command Iv from the power control port 11 of the timing controller 10 through the power communication port 21. The gate drive voltage port 22, the plurality of data drive voltage ports 23 and the common electrode voltage port 24 are electrically connected to the active matrix cholesterol liquid crystal display device 100. The power supply module 20 generates a gate drive voltage Vg, a plurality of data drive voltages Vd and a common electrode voltage Vcom according to the voltage control command Iv, and outputs the gate drive voltage Vg through the gate drive voltage port 22, outputs the plurality of data drive voltages Vd through the plurality of data drive voltage ports 23, and outputs the common electrode voltage Vcom through the common electrode voltage port 24. Each data drive voltage port 23 outputs one of the data drive voltages Vd.

[0052] The power communication port 21 of the power supply module 20 communicates via an internal integrated circuit (Inter-Integrated Circuit, I...) 2 C) communicates with the power control port 11 of the timing controller 10 so that the timing controller 10 can set and control the voltage values ​​output by each gate drive voltage port 22, each data drive voltage port 23 and each common electrode voltage port 24 in the power supply module 20 according to the voltage control command Iv.

[0053] In one embodiment, the power supply module 20 sets the voltage values ​​and polarities of the gate drive voltage Vg, the plurality of data drive voltages Vd, and the common electrode voltage Vcom according to the voltage values ​​recorded in the voltage control instruction Iv, so as to generate the positive polarity of the gate drive voltage Vg, the plurality of data drive voltages Vd, and the common electrode voltage Vcom, and to generate the negative polarity of the gate drive voltage Vg, the plurality of data drive voltages Vd, and the common electrode voltage Vcom. The module outputs the positive or negative polarity of the gate drive voltage Vg through the gate drive voltage port 22, outputs the positive or negative polarity of the plurality of data drive voltages Vd through the plurality of data drive voltage ports 23, and outputs the positive or negative polarity of the common electrode voltage Vcom through the at least one common electrode voltage port 24.

[0054] like Figure 1 and Figure 2As shown, the active-matrix cholesteric liquid crystal display device 100 includes a display panel 110, a gate driving element 120, and a data driving element 130. The display panel 110 includes a plurality of display units 111, a common electrode substrate 112, and a cholesteric liquid crystal layer. Each display unit 111 is electrically connected between the gate driving element 120 and the data driving element 130, and corresponds to a pixel in the display image of the active-matrix cholesteric liquid crystal display device 100. Each display unit 111 includes at least one transistor. Taking an N-type transistor as an example, the gate of each transistor is electrically connected to the gate driving element 120, the source is electrically connected to the data driving element 130, and the drain is electrically connected to the display unit 111. The common electrode substrate 112 is provided with a plurality of common electrode voltage receiving ports 113; the cholesteric liquid crystal layer is disposed between each of the display units 111 and the common electrode substrate 112, and the liquid crystal molecules in the cholesteric liquid crystal layer are arranged and rotated to change their shape according to the electric field generated by a trans-voltage Va between each of the display units 111 and the common electrode substrate 112. The trans-voltage Va is the voltage difference between each of the display units 111 and the common electrode substrate 112, and the positive polarity period and the negative polarity period are distinguished by subtracting the common electrode voltage Vcom received by the common electrode substrate 112 from the plurality of data driving voltages Vd received by each of the display units 111. For example, when the active-matrix cholesteric liquid crystal display device 100 resets the screen, the transverse voltage Va between each display unit 111 and the common electrode substrate 112 distinguishes the positive polarity reset period Rp and the negative polarity reset period Rn. When the active-matrix cholesteric liquid crystal display device 100 displays the screen after reset, the transverse voltage Va between each display unit 111 and the common electrode substrate 112 distinguishes the positive polarity display period Sp and the negative polarity display period Sn. The active-matrix cholesteric liquid crystal display device 100 resets and displays a screen by means of changes in liquid crystal molecules in the cholesteric liquid crystal layer.

[0055] The gate driving element 120 is provided with a gate communication port 121, a gate voltage input port 122, and multiple gate lines GL. The gate communication port 121 and the gate voltage input port 122 are located at the input terminals of the gate driving element 120, and the multiple gate lines GL are located at the output terminals of the gate driving element 120. The gate communication port 121 is signal-connected to the gate control port 12 of the timing controller 10 to receive the gate control command Ig from the timing controller 10 through the gate communication port 121. The gate voltage input port 122 is electrically connected to the gate driving voltage port 22 of the power supply module 20 to receive the gate driving voltage Vg from the power supply module 20 through the gate voltage input port 122. The multiple gate lines GL can output the gate driving voltage Vg respectively, and each gate line GL is connected to multiple display units 111 in the same column or row. Specifically, each A gate line GL can be connected to the gate of at least one transistor in multiple display units 111 in the same column or row, thereby outputting the gate drive voltage Vg output by the power supply module 20 from the gate of each transistor to multiple display units 111 in the same column or row, so as to control the at least one transistor in the multiple display units 111 to turn on or off, thereby controlling whether the corresponding multiple display units 111 are driven by turning on or off the at least one transistor. The gate drive element 120 controls the timing of the output of the gate drive voltage Vg by each of the multiple gate lines GL according to the gate control command Ig. The gate drive element 120 can output the gate drive voltage Vg from one or more gate lines GL simultaneously according to the gate control command Ig. That is to say, the timing controller 10 can drive the multiple display units 111 on one or more gate lines GL simultaneously through the gate control command Ig.

[0056] In one embodiment, the gate driving element 120 is provided with a common electrode voltage input port 123 and a common electrode voltage output port 124. The common electrode voltage input port 123 is electrically connected to the common electrode voltage port 24 of the power supply module 20 to receive the common electrode voltage Vcom from the power supply module 20 through the common electrode voltage port 24. The common electrode voltage output port 124 is electrically connected to the plurality of common electrode voltage receiving ports 113 of the common electrode substrate 112 to transmit the common electrode voltage Vcom to the common electrode substrate 112 through the plurality of common electrode voltage receiving ports 113, thereby changing the overall potential of the common electrode substrate 112 by the common electrode voltage Vcom. When the timing controller 10 controls the active matrix Cholesterol Liquid Crystal Display 100 to execute the screen reset procedure, the display screen of the active matrix Cholesterol Liquid Crystal Display 100 is reset by the voltage Va between each display unit 111 and the common electrode substrate 112.

[0057] The data driving element 130 is provided with a data communication port 131, multiple data voltage input ports 132, and multiple data lines DL. The data communication port 131 and the multiple data voltage input ports 132 are located at the input terminals of the data driving element 130, and the multiple data lines DL are located at the output terminals of the data driving element 130. The data communication port 131 is signal-connected to the data control port 13 of the timing controller 10 to receive the image display command ID from the timing controller 10 through the data communication port 131. The multiple data voltage input ports 132 are electrically connected to the multiple data driving voltage ports 23 of the power supply module 20 to receive the image display command ID through the multiple data lines DL. The input port 132 receives the plurality of data driving voltages Vd from the power supply module 20; the plurality of data lines DL can output the plurality of data driving voltages Vd respectively, and each data line DL is connected to the plurality of display units 111 in the same column or row. Specifically, each data line DL can be connected to the source of at least one transistor in the plurality of display units 111 in the same column or row, thereby outputting the plurality of data driving voltages Vd output by the power supply module 20 to the plurality of display units 111 in the same column or row, and the data driving element 130 controls each data line DL to output one of the corresponding data driving voltages Vd according to the image display instruction Id.

[0058] In one embodiment, the data driving element 130 is provided with a common electrode voltage input port 123 and a common electrode voltage output port 124. The common electrode voltage input port 123 is electrically connected to the common electrode voltage port 24 of the power supply module 20 to receive the common electrode voltage Vcom from the power supply module 20 through the common electrode voltage port 24. The common electrode voltage output port 124 is electrically connected to the plurality of common electrode voltage receiving ports 113 of the common electrode substrate 112 to transmit the common electrode voltage Vcom to the common electrode substrate 112 through the common electrode voltage receiving ports 113, thereby changing the overall potential of the common electrode substrate 112 by the common electrode voltage Vcom. When the timing controller 10 controls the active matrix Cholesterol Liquid Crystal Display 100 to execute the screen reset procedure, the timing controller 10 controls the data driving element 130 to output the common electrode voltage Vcom from the common electrode voltage output port 124 to the common electrode substrate 112 through the image display instruction Id within the screen reset procedure, and the display screen of the active matrix Cholesterol Liquid Crystal Display 100 is reset by the voltage Va between each display unit 111 and the common electrode substrate 112.

[0059] Figure 1Taking the plurality of gate lines GL arranged horizontally in parallel intervals, with each gate line GL connected to each display unit 111 located in the same row, and the plurality of data lines DL arranged vertically in parallel intervals, with each data line DL connected to each display unit 111 located in the same column as an example, one gate line GL and one data line DL are connected to a display unit 111. When the gate line GL outputs the gate driving voltage Vg to the display unit 111, the display unit 111 is turned on, allowing the data line DL to send a data driving voltage Vd corresponding to the display unit 111 into the display unit 111. This causes the voltage Va between the display unit 111 and the common electrode substrate 112 to change due to the data driving voltage Vd, thereby controlling the grayscale, brightness, and color of a pixel corresponding to the display unit 111.

[0060] In each display unit 111, the at least one transistor can be a thin-film transistor (TFT); the gate driving element 120 can be a driving chip. Taking the at least one transistor as an N-type example, the gate driving element 120 is used to control the switching of each transistor by turning on or off the gate of the at least one transistor in the same column or row of display units 111. The gate driving element 120 can also be called a scan driving element; the data driving element 130 can also be a driving chip. Taking the at least one transistor as an N-type example, the data driving element 130 is used to input different voltages from the source of the at least one transistor when the at least one transistor in each display unit 111 is turned on, thereby changing the voltage Va between each display unit 111 and the common electrode substrate 112, so as to control the brightness, color, and grayscale of the pixel corresponding to each display unit 111.

[0061] Figure 2The common electrode substrate 112 is provided with two common electrode voltage receiving ports 113, and the gate driving element 120 and the data driving element 130 are respectively provided with a common electrode voltage input port 123 and a common electrode voltage output port 124 to receive the common electrode voltage Vcom and transmit the common electrode voltage Vcom to the common electrode substrate 112 through different common electrode voltage receiving ports 113. The common electrode voltage output port 124 of the gate driving element 120 is electrically connected to one of the common electrode voltage receiving ports 113, and the common electrode voltage output port 124 of the data driving element 130 is electrically connected to the other common electrode voltage receiving port. Taking port 113 as an example, when the timing controller 10 controls the active matrix cholesteric liquid crystal display device 100 to execute the screen reset procedure, the timing controller 10 controls the gate driving element 120 to output the common electrode voltage Vcom to the common electrode substrate 112 through one of the common electrode voltage receiving ports 113 via the gate control instruction Ig, and controls the data driving element 130 to output the common electrode voltage Vcom to the common electrode substrate 112 through another common electrode voltage receiving port 113 via the image display instruction Id, so as to reset the display screen of the active matrix cholesteric liquid crystal display device 100.

[0062] When the timing controller 10 controls the active matrix cholesteric liquid crystal display device 100 to execute the background image display program, on the one hand, the timing controller 10 controls the gate driving element 120 to output the gate driving voltage Vg from the plurality of gate lines GL through the gate control instruction Ig corresponding to the background image parameter data. On the other hand, the timing controller 10 controls the data driving element 130 to output one of the corresponding data driving voltages Vd from the plurality of data lines DL through the image display instruction Id corresponding to the background image parameter data, so that the display screen of the active matrix cholesteric liquid crystal display device 100 displays the background image.

[0063] In other words, the timing controller 10 outputs the voltage control command Iv, the gate control command Ig, and the image display command Id corresponding to the background image parameter data to the power supply module 20, the gate driving element 120, and the data driving element 130, respectively. The timing controller 10 controls the switching timing of at least one transistor in each display unit 111 through the gate control command Ig, and transmits the gate driving voltage Vg to the corresponding display unit through each gate line GL according to the switching timing in the gate control command Ig. 111, causing at least one transistor in each display unit 111 to be turned on or off, and when each display unit 111 is turned on, the timing controller 10 controls the output of different data driving voltages Vd to each display unit 111 via the multiple data lines DL according to the image display instruction Id. Each pixel corresponding to each display unit 111 can generate different transverse voltage Va between each display unit 111 and the common electrode substrate 112 according to the different input data driving voltages Vd, thereby displaying the grayscale, brightness and color corresponding to the background image.

[0064] When the timing controller 10 controls the active matrix Cholesterol liquid crystal display device 100 to execute the handwritten image display program, on the one hand, the timing controller 10 controls the gate driving element 120 to output the gate driving voltage Vg from the plurality of gate lines GL through the gate control instruction Ig corresponding to the handwritten image parameter data. On the other hand, the timing controller 10 controls the data driving element 130 to output one of the corresponding data driving voltages Vd from the plurality of data lines DL through the image display instruction Id corresponding to the handwritten image parameter data, so that the display screen of the active matrix Cholesterol liquid crystal display device 100 displays the handwritten image.

[0065] It should be noted that this series of embodiments describes one type of active matrix cholesteric liquid crystal display device 100 to facilitate the explanation of the driving system and handwriting image display method of the present invention. However, the active matrix cholesteric liquid crystal display device 100 is not limited to this embodiment, and the cholesteric liquid crystal layer in the active matrix cholesteric liquid crystal display device 100 can be a monochrome cholesteric liquid crystal layer, a dual-color cholesteric liquid crystal layer, or a multi-color cholesteric liquid crystal layer. The structure of the active matrix cholesteric liquid crystal display device 100 is not the focus of this case, so it will not be described in detail here.

[0066] Please refer to Figures 3A to 3F As shown, Figures 3A to 3F The vertical axis represents voltage, which can be expressed in volts (V), while the horizontal axis represents time, which can be expressed in milliseconds (ms). Figures 3D to 3FEach of the multiple data driving voltages Vd, the common electrode voltage Vcom, and the transverse voltage Va generated by the multiple data driving voltages Vd and the common electrode voltage Vcom received by one of the display units 111 respectively, wherein, in an image control signal C, when a background screen refresh command C1 is triggered, the timing controller 10 controls the active matrix cholesteric liquid crystal display device 100 to execute the screen reset program and the background image display program, so that the display screen of the active matrix cholesteric liquid crystal display device 100 presents a background image that allows the user to perform handwriting operations such as writing and drawing.

[0067] The screen reset procedure may include at least one positive reset cycle Rp and at least one negative reset cycle Rn. In the at least one positive reset cycle Rp, the display unit 111 receives the negative common electrode voltage Vcom from the common electrode substrate 112, and in the at least one negative reset cycle Rn, the display unit 111 receives the positive common electrode voltage Vcom from the common electrode substrate 112. The voltage value of the positive common electrode voltage Vcom is the same as the voltage value of the negative common electrode voltage Vcom, and the total duration of the at least one positive reset cycle Rp is equal to the total duration of the at least one negative reset cycle Rn. Since the positive common electrode voltage Vcom and the negative common electrode voltage Vcom not only have the same duration but also the same voltage value, this means that the average voltage of the positive common electrode voltage Vcom plus the negative common electrode voltage Vcom is zero in the screen reset procedure.

[0068] At Figures 3A to 3F In one embodiment, the screen reset procedure includes multiple positive reset cycles Rp and multiple negative reset cycles Rn. In the screen reset procedure, the multiple positive reset cycles Rp and the multiple negative reset cycles Rn are alternately ordered, such that one positive reset cycle Rp is continuous between two negative reset cycles Rn, and one negative reset cycle Rn is continuous between two positive reset cycles Rp.

[0069] See further Figures 3D to 3FAs shown, in this screen reset procedure, the data driving element 130 does not output any data driving voltage Vd to the display unit 111. That is, the corresponding data driving voltage Vd received by the display unit 111 is zero. For the display unit 111 on the pixel electrode substrate, the voltage across Va between the pixel electrode substrate and the common electrode substrate 112 is the common electrode voltage Vcom received by the common electrode substrate 112. Therefore, in this screen reset procedure, the voltage waveform of the voltage across Va of the display unit 111 is the same as the voltage waveform of the received common electrode voltage, but with opposite polarity. In other words, the zero data driving voltage Vd minus the common electrode voltage Vcom equals the voltage across Va waveform with the opposite polarity to the common electrode voltage Vcom.

[0070] The background image display program may include at least one positive polarity display cycle Sp and at least one negative polarity display cycle Sn. In the at least one positive polarity display cycle Sp, the display unit 111 receives the plurality of positive polarity data driving voltages Vd from the data driving element 130, and in the at least one negative polarity display cycle Sn, the display unit 111 receives the plurality of negative polarity data driving voltages Vd from the data driving element 130. The average voltage of the plurality of positive polarity data driving voltages Vd in the at least one positive polarity display cycle Sp is equal to the average voltage of the at least one negative polarity display cycle Sn. In the positive display cycle Sn, the average voltage of the plurality of negative data driving voltages Vd is the same, and the total duration of the at least one positive display cycle Sp is equal to the total duration of the at least one negative display cycle Sn. Since the plurality of positive data driving voltages Vd and the plurality of negative data driving voltages Vd not only have the same voltage duration but also have the same average voltage value, it means that in the background image display program, the total average voltage of the plurality of positive data driving voltages Vd plus the plurality of negative data driving voltages Vd is zero.

[0071] It should be noted that, under the condition that the total average voltage of the plurality of positive polarity data driving voltages Vd plus the plurality of negative polarity data driving voltages Vd in the background image display program is zero, the order of the plurality of positive polarity display periods Sp and the plurality of negative polarity display periods Sn in the background image display program can be arbitrarily ordered, and is not limited to this embodiment.

[0072] See further Figures 3D to 3FAs shown, in the background image display program, the common electrode substrate 112 does not receive any common electrode voltage Vcom, meaning the overall voltage of the common electrode substrate 112 is zero. For the display unit 111 of the pixel electrode substrate, the voltage across Va between the pixel electrode substrate and the common electrode substrate 112 is the received data driving voltage Vd. Therefore, in the background image display program, the voltage waveform of the voltage across Va of the display unit 111 is the same as the voltage waveform of the received multiple data driving voltages Vd. In other words, the data driving voltage Vd minus the zero common electrode voltage Vcom equals the same voltage across Va waveform as the data driving voltage Vd.

[0073] Please refer to Figures 4A to 4F As shown, Figures 4A to 4F The vertical axis represents voltage, which can be expressed in volts (V), while the horizontal axis represents time, which can be expressed in milliseconds (ms). Figures 4D to 4F Each of the multiple data driving voltages Vd, the common electrode voltage Vcom, and the transverse voltage Va generated by the multiple data driving voltages Vd and the common electrode voltage Vcom received by one of the display units 111 is respectively addressed in the image control signal C. When a handwriting mode start command C2 is triggered, the timing controller 10 controls the active matrix Cholesterol liquid crystal display device 100 to execute the handwriting image display program. When a handwriting mode end command C3 is triggered, the timing controller 10 controls the active matrix Cholesterol liquid crystal display device 100 to stop executing the handwriting image display program. When a background image refresh command C4 is triggered, the timing controller 10 controls the active matrix Cholesterol liquid crystal display device 100 to execute the image reset program and the background image display program again, so as to refresh the display screen of the active matrix Cholesterol liquid crystal display device 100 to include the background image containing the handwriting image.

[0074] At Figures 4A to 4F In one embodiment, the handwriting image display program includes at least one handwriting cycle HT, and each handwriting cycle HT may have a preset duration. The number of cycles of the at least one handwriting cycle HT is determined according to the duration of the user's handwriting operation and the preset duration of each handwriting cycle HT. For example, when the preset duration of each handwriting cycle HT is one frame and the duration of the user's handwriting operation is three frames, the handwriting image display program in which the user performs the handwriting operation includes three handwriting cycles HT.

[0075] Preferably, when the handwriting image display program includes multiple handwriting cycles HT, the multiple handwriting cycles HT include at least one positive handwriting cycle Hp and at least one negative handwriting cycle Hn, and each of the positive handwriting cycles Hp and each of the negative handwriting cycles Hn is arranged alternately. In each of the positive handwriting cycles Hp, the display unit 111 receives the multiple positive data driving voltages Vd from the data driving element 130, and in each of the negative handwriting cycles Hn, the display unit 111 receives the multiple negative data driving voltages Vd from the data driving element 130.

[0076] In every two consecutive handwriting cycles HT, one handwriting cycle HT is a positive handwriting cycle Hp, and the other handwriting cycle HT is a negative handwriting cycle Hn. The total duration of the positive handwriting cycle Hp is equal to the total duration of the negative handwriting cycle Hn. The average voltage of the positive data driving voltages Vd in the positive handwriting cycle Hp is the same as the average voltage of the negative data driving voltages Vd in the negative handwriting cycle Hn. In every two consecutive handwriting cycles HT, the total average voltage of the positive data driving voltages Vd plus the negative data driving voltages Vd is also zero.

[0077] Depend on Figures 3A to 3F It can be seen that regardless of the duration of the screen reset procedure, the total duration, voltage value, and voltage polarity of the at least one positive polarity reset cycle Rp and the at least one negative polarity reset cycle Rn are the same. Similarly, in the background image display procedure, the at least one positive polarity display cycle Sp and the at least one negative polarity display cycle Sn also have the same total duration, voltage value, and voltage polarity. On the other hand, from... Figures 4A to 4F It can be seen that regardless of the duration of the handwriting image display program, when the handwriting image display program contains multiple handwriting cycles HT, the total duration of every two consecutive handwriting cycles HT is the same, the voltage value is the same, and the voltage polarity is symmetrical. Whether in the screen reset program, the background image display program, or the handwriting image display program, the driving system of the present invention applies voltages with opposite polarities but the same voltage value to the active matrix cholesteric liquid crystal display device 100 to complete the polarity reversal of the active matrix cholesteric liquid crystal display device 100. This prevents the active matrix cholesteric liquid crystal display device 100 from being driven by a voltage of the same polarity for a long time, causing the liquid crystal molecules to polarize and generate a self-biased voltage. This avoids the active matrix cholesteric liquid crystal display device 100 from generating afterimages, uneven brightness, display abnormalities, etc., due to the self-biased voltage of the liquid crystal molecules.

[0078] Cooperate Figure 1As shown, in one embodiment, the driving system 1 of the active matrix Cholesterol Liquid Crystal Display (AMLCD) includes a temperature detection module 30. The temperature detection module 30 has a temperature signal output port 31, and the timing controller 10 has a temperature communication port 14. The temperature detection module 30 is signal-connected to the temperature communication port 14 of the timing controller 10 through the temperature signal output port 31. The temperature detection module 30 is disposed inside the AMLCD 100 or on the AMLCD 100, for example, disposed on the AMLCD 100. On a circuit board inside the display device 100, or on the outer surface of the active matrix Cholesterol Liquid Crystal Display 100, the temperature detection module 30 senses the device temperature of the active matrix Cholesterol Liquid Crystal Display 100 and generates a temperature signal T based on the device temperature. The temperature signal output port 31 of the temperature detection module 30 transmits the temperature signal T to the timing controller 10 via the temperature communication port 14. The temperature signal output port 31 of the temperature detection module 30 communicates with the temperature communication port 14 of the timing controller 10 through an internal integrated circuit.

[0079] Because the attraction or viscosity between liquid crystal molecules may change due to the different device temperatures of the active matrix cholesteric liquid crystal display device 100, a higher attraction or viscosity between liquid crystal molecules requires a larger voltage to drive the active matrix cholesteric liquid crystal display device 100 to operate. Conversely, a lower attraction or viscosity between liquid crystal molecules requires a smaller voltage to drive the active matrix cholesteric liquid crystal display device 100 to operate. Therefore, the timing controller 10 internally stores a preset temperature-voltage meter, which records the relationship between different device temperatures and different voltage values ​​for driving the active matrix cholesteric liquid crystal display device 100. For example, the temperature-voltage meter can record different voltage values ​​for driving the active matrix cholesteric liquid crystal display device 100 to perform various screen displays or screen resets at each device temperature.

[0080] When the timing controller 10 receives the temperature signal T, it adjusts the voltage control command Iv according to the temperature voltmeter based on the temperature signal T, and then transmits the voltage control command Iv to the power supply module 20. By adjusting the voltage control command Iv, the timing controller 10 adjusts the voltage values ​​of the gate drive voltage Vg, the multiple data drive voltages Vd, and the common electrode voltage Vcom generated by the power supply module 20, so that the timing controller 10 can adjust the voltage output to the active matrix cholesterol liquid crystal display device 100 according to the different device temperatures of the active matrix cholesterol liquid crystal display device 100.

[0081] For example, when the temperature of the active-matrix cholesteric liquid crystal display device 100 rises, the timing controller 10 determines, based on the temperature signal T and the temperature voltmeter, that it is necessary to reduce the voltages output to the active-matrix cholesteric liquid crystal display device 100. The timing controller 10 adjusts the voltage control command Iv output to the power supply module 20, causing the power supply module 20 to reduce the voltage values ​​of the gate drive voltage Vg, the multiple data drive voltages Vd, and the common electrode voltage Vcom according to the voltage control command Iv. When the temperature of the active matrix cholesterol liquid crystal display device 100 decreases, the timing controller 10 determines, based on the temperature signal T and the temperature voltmeter, that it is necessary to increase the voltages output to the active matrix cholesterol liquid crystal display device 100. The timing controller 10 adjusts the voltage control command Iv output to the power supply module 20, so that the power supply module 20 increases the voltage values ​​of the gate drive voltage Vg, the plurality of data drive voltages Vd, and the common electrode voltage Vcom according to the voltage control command Iv.

[0082] In this way, the timing controller 10 can make the various voltages output to the active matrix Cholesterol liquid crystal display device 100 more in line with the driving voltage required by the active matrix Cholesterol liquid crystal display device 100 at the device temperature, avoid unnecessary power consumption, improve the overall power efficiency of the active matrix Cholesterol liquid crystal display device 100, and ensure that the active matrix Cholesterol liquid crystal display device 100 can still accurately present the brightness and color of the display screen at different device temperatures.

[0083] Please refer to Figure 5 and Figure 6 As shown, the driving system 1 of the active matrix cholesteric liquid crystal display device uses a single-chip system (SoC), which further includes a single-chip device 40. The single-chip device 40 includes a processor 41 and a memory 42. The processor 41 is electrically connected to the memory 42, and the processor 41 performs image processing on a background image data to generate background image parameter data according to a voltage parameter corresponding to each pixel in the background image data, as well as a vertical synchronization signal Vsync and a data enable signal DE corresponding to the background image parameter data, and stores the background image parameter data, the vertical synchronization signal Vsync and the data enable signal DE in the memory 42.

[0084] When a user performs a handwriting operation on the active matrix Cholesterol Liquid Crystal Display 100, the active matrix Cholesterol Liquid Crystal Display 100 generates a handwriting signal based on the user's handwriting operation and transmits the handwriting signal to the single-chip device 40. The processor 41 generates handwriting image data corresponding to the user's handwriting operation based on the handwriting signal. The processor 41 performs image processing on the handwriting image data to generate handwriting image parameter data based on a voltage parameter corresponding to each pixel in the handwriting image data, as well as the vertical synchronization signal Vsync and the data enable signal DE corresponding to the handwriting image parameter data, and stores the handwriting image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE in the memory 42.

[0085] The memory 42 is connected to the timing controller 10. The timing controller 10 receives the background image parameter data, the vertical synchronization signal Vsync and the data enable signal DE corresponding to the background image parameter data, the handwriting image parameter data, the vertical synchronization signal Vsync and the data enable signal DE corresponding to the handwriting image parameter data from the memory 42. The processor 41 can set the duration of the screen reset program and / or the background image display program according to the timing relationship between the background image parameter data, the vertical synchronization signal Vsync and the data enable signal DE, and set the duration of each handwriting cycle HT in the handwriting image display program according to the timing relationship between the handwriting image parameter data, the vertical synchronization signal Vsync and the data enable signal DE.

[0086] At Figure 5 In one embodiment, the timing controller 10 may be a hardware timing controller 10, which is disposed outside the single-chip device 40 and signal-connected to the single-chip device 40, so as to receive the background image parameter data, the handwriting image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE from the single-chip device 40. The single-chip device 40 communicates with the timing controller 10 through a Serial Peripheral Interface Bus (SPI) and Low-Voltage Differential Signaling (LVDS), or further through a Mobile Industry Processor Interface (MIPI) to transmit the vertical synchronization signal Vsync, the background image parameter data, the handwriting image parameter data, and the data enable signal DE to the timing controller 10.

[0087] At Figure 6In one embodiment, the timing controller 10 may be a software timing controller 10, which is disposed in the single-chip device 40 and signal-connected to the memory 42 to receive the background image parameter data, the handwritten image parameter data, the vertical synchronization signal Vsync and the data enable signal DE from the single-chip device 40.

[0088] In one embodiment, the memory 42 stores device characteristic data of the active matrix cholesteric liquid crystal display device 100. The device characteristic data includes correlation information between different material properties of liquid crystal molecules in the active matrix cholesteric liquid crystal display device 100 and the driving time required for different driving voltages. The material properties of liquid crystal molecules include viscosity, fluidity, intermolecular distance, molecular arrangement, etc. For example, when the viscosity of liquid crystal molecules in the active matrix cholesteric liquid crystal display device 100 is high, it means that under the same driving voltage, compared with other cholesteric liquid crystal display devices with lower liquid crystal molecule viscosity, the active matrix cholesteric liquid crystal display device 100 requires a longer driving time to rotate the liquid crystal molecules of the active matrix cholesteric liquid crystal display device 100 to the required arrangement state.

[0089] The processor 41 adjusts the timing relationship between the background image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE according to the device characteristic data. This allows it to adjust the duration of the screen reset procedure and / or the background image display procedure based on the corresponding timing relationship between the background image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE. For example, it adjusts the number of frames corresponding to the screen reset procedure and / or the background image display procedure based on the device characteristic data. For instance, if the device characteristic data is based on the material properties of the liquid crystal molecules in the active matrix cholesteric liquid crystal display device 100, the corresponding driving current... When the driving time required to rotate the liquid crystal molecules in the active matrix cholesteric liquid crystal display device 100 is long, the processor 41 can increase the duration of the screen reset program and / or the background image display program according to the device characteristic data; conversely, if the driving time required to rotate the liquid crystal molecules in the active matrix cholesteric liquid crystal display device 100 is short at the corresponding driving voltage according to the material characteristics of the liquid crystal molecules in the active matrix cholesteric liquid crystal display device 100, the processor 41 can shorten the duration of the screen reset program and / or the background image display program according to the device characteristic data.

[0090] In another embodiment, the memory 42 stores device characteristic data of the active matrix cholesteric liquid crystal display device 100. The device characteristic data includes correlation information between different material properties of liquid crystal molecules in the active matrix cholesteric liquid crystal display device 100 and the driving voltage required for different driving times. The material properties of liquid crystal molecules include viscosity, fluidity, intermolecular distance, molecular arrangement, etc. For example, when the viscosity of liquid crystal molecules in the active matrix cholesteric liquid crystal display device 100 is high, it means that under the same driving time, compared with other cholesteric liquid crystal display devices with lower liquid crystal molecule viscosity, the active matrix cholesteric liquid crystal display device 100 requires a larger driving voltage to rotate the liquid crystal molecules of the active matrix cholesteric liquid crystal display device 100 to the required arrangement state.

[0091] Based on the timing relationship between the background image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE, and the duration of the screen reset procedure and / or the background image display procedure, the processor 41 adjusts the voltage parameter corresponding to each pixel in the background image parameter data according to the device characteristic data. After the timing controller 10 generates the voltage control command Iv and the image display command Id according to the vertical synchronization signal Vsync, the data enable signal DE, and the adjusted background image parameter data, the power supply module 20 can generate a driving voltage that conforms to the device characteristics of the active matrix cholesteric liquid crystal display device 100 according to the voltage control command Iv. The timing controller 10 can control the data driving element 130 to output a driving voltage that conforms to the device characteristics of the active matrix cholesteric liquid crystal display device 100 to the corresponding display units 111. For example, if, based on the material characteristics of the liquid crystal molecules in the active-matrix cholesteric liquid crystal display device 100, the device characteristic data records that, under the duration of the corresponding screen reset program and / or background image display program, the driving voltage required to drive the liquid crystal molecules in the active-matrix cholesteric liquid crystal display device 100 to rotate is relatively large, the processor 41 can adjust the background image parameter data according to the device characteristic data, thereby increasing the driving voltage value output by the power supply module 20. Conversely, if, based on the material characteristics of the liquid crystal molecules in the active-matrix cholesteric liquid crystal display device 100, the device characteristic data records that, under the duration of the corresponding screen reset program and / or background image display program, the driving voltage required to drive the liquid crystal molecules in the active-matrix cholesteric liquid crystal display device 100 to rotate is relatively small, the processor 41 can adjust the background image parameter data according to the device characteristic data, thereby decreasing the driving voltage value output by the power supply module 20.

[0092] The driving system 1 of the active matrix cholesterol liquid crystal display device of the present invention can adjust the driving mode of the active matrix cholesterol liquid crystal display device 100 according to the device characteristics of different active matrix cholesterol liquid crystal display devices 100, thereby improving the accuracy of control of the active matrix cholesterol liquid crystal display device 100, avoiding unnecessary power consumption, and meeting the control requirements of different active matrix cholesterol liquid crystal display devices 100.

[0093] Please refer to Figure 7 As shown, the processor 41 includes an e-book software 411, a notepad software 412, an image playback software 413, multiple image parameter lookup tables 414, and an image processing program 415. The processor 41 can receive background image data of an e-book the user wants to view from the e-book software 411, background image data of a notepad the user wants to view from the notepad software 412, or background image data of a file the user wants to view from the image playback software 413. Each image parameter lookup table 414 corresponds to a different image format, and each image parameter lookup table 414 contains voltage parameters corresponding to different brightness, chroma, and other image information under the corresponding image format. The image processing program 415 connects to the e-book software 411, the notepad software 412, and the video playback software 413 to receive the background image data from the e-book software 411, the notepad software 412, and / or the video playback software 413. Based on the image format of the background image data generated by the e-book software 411, the notepad software 412, and / or the video playback software 413, the image processing program 415 performs image processing on the background image data according to one of the image parameter lookup tables 414 of the image format to generate the background image parameter data of the background image data. The processor 41 runs a Linux operating system and / or an Android operating system.

[0094] The e-book software 411, the notepad software 412, and the video playback software 413 can receive the background screen refresh instruction C1, the handwriting mode start instruction C2, the handwriting mode end instruction C3, or the background screen refresh instruction C4 containing handwriting image from the image control signal C generated by the user's operation on the active matrix CLOMS 100. For example, when a user wants to read an e-book in the e-book software 411 and operates the active matrix CLOMS 100 accordingly, the e-book software 411 receives the background screen refresh instruction C1 from the image control signal C generated by the user's operation, and determines that the user wants to read the e-book based on the background screen refresh instruction C1 in the image control signal C1. The e-book software 411 then outputs background image data of the e-book according to the background screen refresh instruction C1 in the image control signal C1. When the user wants to perform handwriting operation to record text, symbols, or graphics based on the background image corresponding to the background image data, the e-book software 413... The e-book software 411 receives the handwriting mode start command C2 generated by the user's operation. Based on the handwriting mode start command C2, it determines that the user wants to start a handwriting operation and executes the handwriting image display program. After the user finishes the handwriting operation, the e-book software 411 can receive the handwriting mode end command C3 generated by the user's operation again. Based on the handwriting mode end command C3, it determines that the user wants to end the handwriting operation and stops the handwriting image display program. Then, the e-book software 411 combines the user's handwriting image with the background screen and sends a background screen refresh command C4 containing the handwriting image to update the content of the e-book software 411.

[0095] In one embodiment, the processor 41 can receive user setting data input by the user through the e-book software 411, the notepad software 412, and the video playback software 413. The user setting data includes the user's settings for different display parameters such as contrast, image enhancement, brightness, and chroma of the active matrix cholesteric liquid crystal display device 100 through the e-book software 411, the notepad software 412, and the video playback software 413, or the user's settings for different handwriting parameters such as the thickness, contrast, color, and transparency of the handwriting when using the handwriting function. The memory stores display characteristic data, which includes the relationship between the values ​​of different display parameters under various driving voltages and the duration of the screen reset program and / or the background image display program, and the relationship between the values ​​of different display parameters under various driving durations and the voltage values ​​of the driving voltage of the active matrix cholesteric liquid crystal display device 100.

[0096] On one hand, the processor 41 can adjust the timing relationship between the background image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE according to the user setting data and the display characteristic data, so as to adjust the duration of the screen reset program and / or the background image display program according to the corresponding timing relationship between the background image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE, for example, adjusting the number of frames corresponding to the screen reset program and / or the background image display program according to the display characteristic data, so that the display screen of the active matrix cholesteric liquid crystal display device 100 conforms to the user's display settings. For example, if a display parameter corresponding to contrast is high in the user setting data, and the display characteristic data records that at the corresponding driving voltage, a higher display parameter corresponds to a longer driving time, the processor 41 can increase the duration of the screen reset program and / or the background image display program according to the display characteristic data; conversely, if a display parameter corresponding to contrast is low in the user setting data, and the display characteristic data records that at the corresponding driving voltage, a lower display parameter corresponds to a shorter driving time, the processor 41 can shorten the duration of the screen reset program and / or the background image display program according to the display characteristic data, thereby enabling the display screen of the active matrix cholesteric liquid crystal display device 100 to achieve the contrast corresponding to the display parameter.

[0097] On the other hand, under the duration of the screen reset procedure and / or the background image display procedure set according to the timing relationship between the background image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE, the processor 41 adjusts the voltage parameter corresponding to each pixel in the background image parameter data according to the user setting data and the display characteristic data. After the timing controller 10 generates the voltage control command Iv and the image display command Id according to the vertical synchronization signal Vsync, the data enable signal DE, and the adjusted background image parameter data, the power supply module 20 can generate a driving voltage that conforms to the user's display settings according to the voltage control command Iv, and the timing controller 10 can control the data driving element 130 to output the driving voltage that conforms to the user's display settings to the corresponding display units 111. For example, if a display parameter corresponding to contrast in the user setting data is high, and the display characteristic data records that under the duration of the corresponding screen reset program and / or background image display program, the higher display parameter corresponds to a larger driving voltage, the processor 41 can increase the driving voltage value output by the power supply module 20 according to the display characteristic data; conversely, if a display parameter corresponding to contrast in the user setting data is low, and the display characteristic data records that under the duration of the corresponding screen reset program and / or background image display program, the lower display parameter corresponds to a smaller driving voltage, the processor 41 can decrease the driving voltage value output by the power supply module 20 according to the display characteristic data.

[0098] In one embodiment, the processor 41 can further receive handwriting setting data input by the user through the e-book software 411, the notepad software 412, and the video playback software 413. The handwriting setting data includes the user's settings for different handwriting parameters such as the thickness, contrast, color, and transparency of the handwriting when using the handwriting function through the e-book software 411, the notepad software 412, and the video playback software 413. The memory stores handwriting characteristic data, which includes the relationship between the values ​​of different handwriting parameters and the voltage value of the driving voltage of the active matrix cholesteric liquid crystal display device 100.

[0099] The processor 41 can adjust the voltage parameters corresponding to each pixel in the handwriting image parameter data according to the handwriting setting data and the handwriting characteristic data. After the timing controller 10 generates the voltage control command Iv and the image display command Id according to the vertical synchronization signal Vsync, the data enable signal DE and the adjusted background image parameter data, the power supply module 20 can generate a driving voltage that conforms to the user's handwriting settings according to the voltage control command Iv. The timing controller 10 can control the data driving element 130 to output the driving voltage that conforms to the user's handwriting settings to the corresponding display units 111. Thus, according to different handwriting settings of the user, the color, thickness, transparency and other aspects of the handwriting trajectory presented by the active matrix cholesteric liquid crystal display device 100 are adjusted accordingly.

[0100] Please refer to Figures 3A to 4F , Figures 8A to 8C As shown, with Figures 3A to 3F The background image displayed by the background image display program is Figure 8A A notepad screen B, Figures 4A to 4F The handwritten image displayed by the handwritten image display program is Figure 8B Taking a handwritten signature R as an example, when the user wants to perform a handwriting operation on the notepad screen B to record the handwritten signature R, the active matrix Cholesterol Liquid Crystal Display 100 transmits the handwriting signal generated by the user's handwriting operation to the single-chip device 40. The processor 41 generates the handwritten image data corresponding to the handwritten signature R based on the handwriting signal, and performs the corresponding handwritten image display program based on the handwritten image data.

[0101] The processor 41 can further update and store the background image data using the handwritten image data, so that the updated background image data includes the notepad screen B and the handwritten signature R. Then, the processor 41 generates new background image parameter data based on the new background image data, allowing the timing controller to... Figures 4A to 4F As shown, after the handwriting image display program is completed, a new screen reset program and a new background image display program are executed based on the new background image parameter data to display... Figure 8C The notepad screen B contains the handwritten signature R.

[0102] Please refer to Figure 9. The handwriting image display method of the active matrix cholesteric liquid crystal display device 100 of the present invention is used to control an active matrix cholesteric liquid crystal display device 100. The handwriting image display method of the active matrix cholesteric liquid crystal display device 100 is executed by the driving system 1 of the active matrix cholesteric liquid crystal display device and includes the following steps.

[0103] S10: Based on background image parameter data, a data enable signal DE and a vertical synchronization signal Vsync, generate a voltage control command Iv, a gate control command Ig and an image display command Id.

[0104] S20: Generate a gate drive voltage Vg, multiple data drive voltages Vd, and a common electrode voltage Vcom according to the voltage control command Iv.

[0105] S30: Execute a screen reset procedure. In the screen reset procedure, the gate drive voltage Vg is output to the plurality of display units 111 of the active matrix cholesteric liquid crystal display device 100 to control the multiple display units 111 to turn on or off. The switching sequence of the multiple display units 111 is controlled according to the gate control command Ig. The common electrode voltage Vcom is output to the multiple display units 111 that are turned on, so that the multiple display units 111 that are turned on perform screen reset.

[0106] In step S30, the screen reset procedure includes at least one positive reset cycle Rp and at least one negative reset cycle Rn. In the at least one positive reset cycle Rp, the negative common electrode voltage Vcom is output to the activated plurality of display units 111. In the at least one negative reset cycle Rn, the positive common electrode voltage Vcom is output to the activated plurality of display units 111. The voltage value of the positive common electrode voltage Vcom is the same as the voltage value of the negative common electrode voltage Vcom. The total duration of the at least one positive reset cycle Rp is equal to the total duration of the at least one negative reset cycle Rn. The average voltage value of the positive common electrode voltage Vcom plus the negative common electrode voltage Vcom in the screen reset procedure is zero.

[0107] S40: Execute a background image display program. In the background image display program, the gate driving voltage Vg is output to the plurality of display units 111 of the active matrix cholesteric liquid crystal display device 100 to control the opening or closing of the plurality of display units 111. The switching timing of the plurality of display units 111 is controlled according to the gate control command Ig. The plurality of data driving voltages Vd are output to the opened plurality of display units 111 so that the opened plurality of display units 111 display a background image.

[0108] In step S40, the background image display program includes at least one positive polarity display cycle Sp and at least one negative polarity display cycle Sn. In the at least one positive polarity display cycle Sp, the plurality of positive polarity data driving voltages Vd are output to the plurality of activated display units 111. In the at least one negative polarity display cycle Sn, the plurality of negative polarity data driving voltages Vd are output to the plurality of activated display units 111. The average voltage value of the plurality of positive polarity data driving voltages Vd in the at least one positive polarity display cycle Sp is the same as the average voltage value of the plurality of negative polarity data driving voltages Vd in the at least one negative polarity display cycle Sn. The total duration of the at least one positive polarity display cycle Sp is equal to the total duration of the at least one negative polarity display cycle Sn. The total average voltage value of the plurality of positive polarity data driving voltages Vd plus the plurality of negative polarity data driving voltages Vd in the background image display program is zero.

[0109] S50: Based on a handwritten image parameter data, the data enable signal DE and the vertical synchronization signal Vsync, generate a new voltage control command Iv, a new gate control command Ig and a new image display command Id.

[0110] S60: Generate a gate drive voltage and multiple data drive voltages Vd according to the new voltage control instruction Iv.

[0111] S70: Execute a handwriting image display program. In the handwriting image display program, the gate driving voltage Vg is output to the plurality of display units 111 of the active matrix cholesteric liquid crystal display device 100 to control the multiple display units 111 to turn on or off. The switching timing of the multiple display units 111 is controlled according to the gate control command Ig. The multiple data driving voltages Vd are output to the multiple display units 111 that are turned on, so that the multiple display units 111 that are turned on display a handwriting image.

[0112] In step S70, the handwriting image display program includes at least one handwriting cycle HT. The number of cycles of the at least one handwriting cycle HT is determined according to the duration of the user's handwriting operation and a preset duration of each handwriting cycle HT. When the handwriting image display program includes multiple handwriting cycles HT, the multiple handwriting cycles HT include at least one positive polarity handwriting cycle Hp and at least one negative polarity handwriting cycle Hn. The positive polarity handwriting cycles Hp and the negative polarity handwriting cycles Hn are arranged alternately. In each positive polarity handwriting cycle Hp, the multiple positive polarity data driving voltages Vd are output to the display unit 111, and in each negative polarity handwriting cycle Hn, the multiple negative polarity data driving voltages Vd are output to the display unit 111.

[0113] In every two consecutive handwriting cycles HT, one handwriting cycle HT is a positive handwriting cycle Hp, and the other handwriting cycle HT is a negative handwriting cycle Hn. The total duration of the positive handwriting cycle Hp is equal to the total duration of the negative handwriting cycle Hn. The average voltage of the positive data driving voltages Vd in the positive handwriting cycle Hp is the same as the average voltage of the negative data driving voltages Vd in the negative handwriting cycle Hn. In every two consecutive handwriting cycles HT, the total average voltage of the positive data driving voltages Vd plus the negative data driving voltages Vd is also zero.

[0114] In addition, after executing step S70, the background image data is further updated and stored with the handwritten image data, and then new background image parameter data is generated based on the new background image data. Step S10 is then re-executed with the new background image parameter data. After the handwritten image display program is completed, a new screen reset program and background image display program are executed based on the new background image parameter data.

[0115] Furthermore, after performing step S10, the following steps can be performed.

[0116] S11: Detect the device temperature of the active matrix cholesterol liquid crystal display device 100, generate a temperature signal T based on the device temperature, and adjust the voltage control command Iv with a temperature voltmeter based on the temperature signal T.

[0117] In one embodiment, step S10 further adjusts the timing relationship between the background image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE based on device characteristic data, and adjusts the duration of the screen reset procedure and the background image display procedure based on the corresponding timing relationship between the background image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE.

[0118] In one embodiment, step S10 further adjusts the voltage parameter corresponding to each pixel in the background image parameter data according to device characteristic data; in step S20, the voltage control command Iv and the image display command Id are generated according to the vertical synchronization signal Vsync, the data enable signal DE and the adjusted background image parameter data, so that in step S30, the gate driving voltage Vg, the plurality of data driving voltages Vd and the common electrode voltage Vcom that conform to the device characteristics of the active matrix cholesteric liquid crystal display device 100 are generated according to the voltage control command Iv.

[0119] In one embodiment, step S10 further receives user setting data input by the user, and adjusts the timing relationship between the background image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE according to the user setting data and a display characteristic data of the active matrix cholesteric liquid crystal display device 100. The duration of the screen reset procedure and the background image display procedure is also adjusted according to the corresponding timing relationship between the background image parameter data, the vertical synchronization signal Vsync, and the data enable signal DE.

[0120] In one embodiment, step S10 further receives user setting data input by the user, and adjusts the voltage parameters corresponding to each pixel in the background image parameter data according to the user setting data and a display characteristic data of the active matrix cholesteric liquid crystal display device 100; in step S20, the voltage control command Iv and the image display command Id are generated according to the vertical synchronization signal Vsync, the data enable signal DE and the adjusted background image parameter data, so that in step S30, the gate driving voltage Vg, the plurality of data driving voltages Vd and the common electrode voltage Vcom are generated according to the voltage control command Iv, which conform to the user setting.

[0121] In one embodiment, step S10 further receives handwriting setting data input by the user, and adjusts the voltage parameters corresponding to each pixel in the handwriting image parameter data according to the handwriting setting data and the handwriting characteristic data of the active matrix cholesteric liquid crystal display device 100; in step S20, the voltage control command Iv and the image display command Id are generated according to the vertical synchronization signal Vsync, the data enable signal DE and the adjusted handwriting image parameter data, so that in step S30, the gate driving voltage Vg, the plurality of data driving voltages Vd and the common electrode voltage Vcom that conform to the handwriting setting are generated according to the voltage control command Iv.

[0122] In the driving system 1 of the active matrix cholesteric liquid crystal display device of the present invention and its handwritten image display method, the timing controller 10 controls the power supply module 20 to generate the gate driving voltage Vg, the plurality of data driving voltages Vd and the common electrode voltage Vcom supplied to the active matrix cholesteric liquid crystal display device 100 through the voltage control command Iv, and then controls the operation of the active matrix cholesteric liquid crystal display device 100 through the gate control command Ig and the image display command Id, so that the active matrix cholesteric liquid crystal display device 100 can display a background image and a handwritten image.

[0123] The timing controller 10 in this invention does not need to perform image processing on the background image data and the handwritten image data. Instead, the processor 41 at the front end of the timing controller 10 executes the image processing program on the background image data and the handwritten image data. Compared with the driving system of a conventional passive matrix Cholesterol liquid crystal display device, the timing controller 10 only needs to generate corresponding instructions based on the background image parameter data and the handwritten image data processed by the processor 41. It does not require setting up additional storage space for the timing controller 10 to store the complete background image data and the handwritten image data for the timing controller 10 to use. This helps to reduce the equipment cost caused by setting up additional storage space and reduce the overall equipment size of the driving system 1 of the active matrix Cholesterol liquid crystal display device.

[0124] On the other hand, the present invention is applied to the active matrix Cholesterol liquid crystal display device 100. Since the active matrix Cholesterol liquid crystal display device 100 uses active elements, the time required to drive the active matrix Cholesterol liquid crystal display device 100 to complete the update of the displayed image is shorter than that required by the passive matrix Cholesterol liquid crystal display device. Moreover, under the same driving voltage, the contrast of the image presented by the active matrix Cholesterol liquid crystal display device 100 is higher than that presented by the passive matrix Cholesterol liquid crystal display device. The timing controller 10 does not need to repeatedly drive the active matrix Cholesterol liquid crystal display device 100 with the same data driving voltage Vd to improve the contrast of the image. It can also further reduce the time required to update the displayed image of the active matrix Cholesterol liquid crystal display device 100, which helps to speed up the display and update speed of the background image and the handwritten image, and provides users with a faster and more stable handwriting experience.

[0125] In addition, in the screen reset program, the present invention uses a common electrode voltage Vcom with opposite polarities but the same voltage value (positive and negative) to drive the active matrix cholesteric liquid crystal display device 100. Similarly, in the background image display program and the handwriting image display program, the present invention also uses multiple data driving voltages Vd with opposite polarities but the same voltage value (positive and negative) to drive the active matrix cholesteric liquid crystal display device 100. This prevents the liquid crystal molecules in the active matrix cholesteric liquid crystal display device 100 from polarizing, reduces the occurrence of afterimages in the displayed image, and increases the service life of the active matrix cholesteric liquid crystal display device 100.

[0126] Furthermore, the present invention can adjust the duration of the screen reset program and the background image display program by using the device characteristic data of the active matrix cholesteric liquid crystal display device 100, or the user setting data and the handwriting setting data set by the user, or adjust the gate driving voltage Vg, the multiple data driving voltages Vd and the common electrode voltage Vcom output to the active matrix cholesteric liquid crystal display device 100, so as to control the active matrix cholesteric liquid crystal display device 100 in accordance with different device characteristics of the active matrix cholesteric liquid crystal display device 100, or different display needs and handwriting needs of the user, thereby helping to improve the accuracy and flexibility of the driving of the active matrix cholesteric liquid crystal display device 100.

Claims

1. A driving system for an active matrix cholesterol liquid crystal display device, characterized in that, For controlling an active-matrix cholesteric liquid crystal display device, the active-matrix cholesteric liquid crystal display device includes a gate driving element, a data driving element, and a plurality of display units electrically connected to the gate driving element and the data driving element respectively. The driving system of the active-matrix cholesteric liquid crystal display device includes: A timing controller is connected to the active matrix Cholesterol liquid crystal display device, and generates a voltage control command, a gate control command and an image display command based on a handwritten image parameter data, a data enable signal and a vertical synchronization signal. The controller outputs the gate control command to the gate driving element and the image display command to the data driving element, and controls the active matrix Cholesterol liquid crystal display device to execute a handwritten image display program. A power supply module is connected to the timing controller and the active matrix cholesterol liquid crystal display device. According to the voltage control command, it generates a gate drive voltage and multiple data drive voltages, and outputs the gate drive voltage to the gate drive element and the multiple data drive voltages to the data drive element. In the handwritten image display program, the timing controller controls the timing of the gate driving element outputting the gate driving voltage by the gate control command, and controls the data driving element to output the multiple data driving voltages by the image display command, so that the active matrix cholesteric liquid crystal display device displays a handwritten image.

2. The driving system of the active matrix cholesterol liquid crystal display device as described in claim 1, characterized in that, The handwriting image display program includes multiple handwriting cycles. In every two consecutive handwriting cycles, one handwriting cycle is a positive polarity handwriting cycle and the other handwriting cycle is a negative polarity handwriting cycle. In each positive polarity handwriting cycle, the data driving element outputs the multiple data driving voltages with positive polarity, and in each negative polarity handwriting cycle, the data driving element outputs the multiple data driving voltages with negative polarity. The duration of the positive handwriting cycle is equal to the duration of the negative handwriting cycle. The average voltage of the positive data driving voltages in the positive handwriting cycle is the same as the average voltage of the negative data driving voltages in the negative handwriting cycle. In every two consecutive handwriting cycles, the total average voltage of the positive data driving voltages plus the negative data driving voltages is zero.

3. The driving system of the active matrix cholesterol liquid crystal display device as described in claim 1, characterized in that, The timing controller generates a new voltage control command, a new gate control command, and a new image display command based on background image parameter data, the data enable signal, and the vertical synchronization signal. It outputs the new gate control command to the gate driving element and the new image display command to the data driving element, and controls the active matrix cholesteric liquid crystal display device to execute a background image display program. The power supply module generates a new gate drive voltage and new multiple data drive voltages according to the new voltage control command. In the background image display program, the timing controller controls the timing of the gate driving element to turn on or off the plurality of display units according to the new gate control instruction. The gate driving element controls the turn on or off of the plurality of display units through the gate driving voltage. The timing controller also controls the data driving element to output the plurality of data driving voltages to the turned-on plurality of display units according to the new image display instruction. The background image display program includes at least one positive polarity display cycle and at least one negative polarity display cycle. In the at least one positive polarity display cycle, the data driving element outputs the plurality of positive polarity data driving voltages, and in the at least one negative polarity display cycle, the data driving element outputs the plurality of negative polarity data driving voltages. The total duration of the at least one positive polarity display cycle is equal to the total duration of the at least one negative polarity display cycle, and an average voltage value of the plurality of positive polarity data driving voltages in the at least one positive polarity display cycle is the same as another average voltage value of the plurality of negative polarity data driving voltages in the at least one negative polarity display cycle.

4. The driving system of the active matrix cholesterol liquid crystal display device as described in claim 3, characterized in that, The timing controller controls the active matrix cholesterol liquid crystal display device to execute a screen reset procedure, and the power supply module generates a common electrode voltage according to the voltage control command. In the screen reset procedure, the timing controller controls the timing of the gate driving element to turn the plurality of display units on or off according to the gate control command. The gate driving element controls the turn of the plurality of display units on or off through the gate driving voltage and outputs the common electrode voltage to the turned-on plurality of display units. The screen reset procedure includes at least one positive reset cycle and at least one negative reset cycle. In the at least one positive reset cycle, the plurality of display units that are turned on receive the common electrode voltage of the negative polarity, and in the at least one negative reset cycle, the plurality of display units that are turned on receive the common electrode voltage of the positive polarity. The total duration of the at least one positive reset cycle is equal to the total duration of the at least one negative reset cycle, and the voltage value of the common electrode voltage of the negative polarity in the at least one positive reset cycle is the same as the voltage value of the common electrode voltage of the positive polarity in the at least one negative display cycle.

5. The driving system of the active matrix cholesteric liquid crystal display device as described in any one of claims 1 to 4, characterized in that, Further includes: A temperature sensing module is connected to the timing controller and is installed in the active matrix cholesterol liquid crystal display device to sense the device temperature of the active matrix cholesterol liquid crystal display device and generate a temperature signal based on the device temperature. The timing controller adjusts the voltage control command based on the temperature signal and a preset temperature-voltage meter.

6. The driving system of the active matrix cholesterol liquid crystal display device as described in claim 1, characterized in that, Further includes: A single-chip device, connected to the active matrix cholesterol liquid crystal display device, includes: A processor performs image processing on a handwritten image data, generates handwritten image parameter data based on a voltage parameter corresponding to each pixel in the handwritten image data, and generates a vertical synchronization signal and a data enable signal corresponding to the handwritten image parameter data. as well as A storage device, connected to the processor, stores the handwritten image parameter data, the vertical synchronization signal, and the data enable signal.

7. The driving system of the active matrix cholesterol liquid crystal display device as described in claim 4, characterized in that, Further includes: A single-chip device, connected to the active matrix cholesterol liquid crystal display device, includes: A processor performs image processing on background image data, generates background image parameter data based on a voltage parameter corresponding to each pixel in the background image data, and generates a vertical synchronization signal and a data enable signal corresponding to the handwritten image parameter data. as well as A storage device, connected to the processor, stores the background image parameter data, the vertical synchronization signal, and the data enable signal; The processor adjusts the timing relationship between the background image parameter data, the vertical synchronization signal, and the data enable signal based on device characteristic data, and adjusts the duration of the screen reset program or the background image display program based on the timing relationship between the background image parameter data, the vertical synchronization signal, and the data enable signal. Alternatively, the processor adjusts the voltage parameter corresponding to each pixel in the background image parameter data based on the device characteristic data; The device's characteristic data includes information on the correlation between driving time and driving voltage corresponding to different material properties.

8. The driving system of the active matrix cholesteric liquid crystal display device as described in claim 4, characterized in that, Further includes: A single-chip device, connected to the active matrix cholesterol liquid crystal display device, includes: A processor performs image processing on background image data, generates background image parameter data based on a voltage parameter corresponding to each pixel in the background image data, and generates a vertical synchronization signal and a data enable signal corresponding to the handwritten image parameter data. as well as A storage device, connected to the processor, stores the background image parameter data, the vertical synchronization signal, and the data enable signal; The processor adjusts the timing relationship between the background image parameter data, the vertical synchronization signal, and the data enable signal based on user setting data and display characteristic data, and adjusts the duration of the screen reset program or the background image display program based on the timing relationship between the background image parameter data, the vertical synchronization signal, and the data enable signal. Alternatively, the processor adjusts the voltage parameter corresponding to each pixel in the background image parameter data based on the user setting data and the display characteristic data; The user setting data includes different display parameters set for the active matrix cholesterol liquid crystal display device, and the display characteristic data includes the correlation information of driving time and driving voltage corresponding to different display parameters.

9. A method for displaying handwritten images in an active matrix cholesterol liquid crystal display device, characterized in that, A method for controlling an active-matrix cholesteric liquid crystal display device, wherein the handwritten image display method of the active-matrix cholesteric liquid crystal display device includes: A1. Based on a handwritten image parameter data, a data enable signal and a vertical synchronization signal, generate a voltage control command, a gate control command and an image display command; A2. Generate a gate drive voltage and multiple data drive voltages according to the voltage control command; A3. Execute a handwritten image display program, output the gate driving voltage to control the opening or closing of multiple display units of the active matrix cholesteric liquid crystal display device, control the switching timing of the multiple display units according to the gate control command, and output the multiple data driving voltages to the multiple display units that are turned on, so that the active matrix cholesteric liquid crystal display device displays a handwritten image.

10. The handwritten image display method of the active matrix cholesterol liquid crystal display device as described in claim 9, characterized in that, The handwriting image display program includes multiple handwriting cycles. In every two consecutive handwriting cycles, one handwriting cycle is a positive polarity handwriting cycle and the other handwriting cycle is a negative polarity handwriting cycle. In each positive polarity handwriting cycle, the multiple positive polarity data driving voltages are output to the multiple display units, and in each negative polarity handwriting cycle, the multiple negative polarity data driving voltages are output to the multiple display units. The duration of the positive handwriting cycle is equal to the duration of the negative handwriting cycle. The average voltage of the positive data driving voltages in the positive handwriting cycle is the same as the average voltage of the negative data driving voltages in the negative handwriting cycle. In every two consecutive handwriting cycles, the total average voltage of the positive data driving voltages plus the negative data driving voltages is zero.

11. The handwritten image display method of the active matrix cholesterol liquid crystal display device as described in claim 9, characterized in that, Before performing step A1, perform the following steps: B1. Based on a background image parameter data, the data enable signal and the vertical synchronization signal, generate another voltage control command, another gate control command and another image display command; B2. Generate a gate drive voltage and multiple data drive voltages according to the voltage control command; B3. Execute a background image display program, output the gate drive voltage to control the multiple display units of the active matrix cholesteric liquid crystal display device to turn on or off, control the switching timing of the multiple display units according to the gate control command, and output the multiple data drive voltages to the multiple display units that are turned on; The background image display program includes at least one positive polarity display cycle and at least one negative polarity display cycle. In the at least one positive polarity display cycle, the plurality of positive polarity data driving voltages are output to the plurality of display units, and in the at least one negative polarity display cycle, the plurality of negative polarity data driving voltages are output to the plurality of display units. The total duration of the at least one positive polarity display cycle is equal to the total duration of the at least one negative polarity display cycle, and the average voltage of the plurality of positive polarity data driving voltages in the at least one positive polarity display cycle is the same as the average voltage of the plurality of negative polarity data driving voltages in the at least one negative polarity display cycle.

12. The handwritten image display method of the active matrix cholesterol liquid crystal display device as described in claim 11, characterized in that, After performing step B1, the following steps shall be performed: C1. Generate the gate drive voltage, the plurality of data drive voltages, and a common electrode voltage according to the voltage control command; C2. Execute a screen reset procedure, output the gate drive voltage to control the multiple display units to turn on or off, control the switching sequence of the multiple display units according to the gate control command, and output the common electrode voltage to the multiple display units that are turned on; The screen reset procedure includes at least one positive reset cycle and at least one negative reset cycle. In the at least one positive reset cycle, the plurality of display units that are turned on receive the common electrode voltage of the negative polarity, while in the at least one negative reset cycle, the plurality of display units that are turned on receive the common electrode voltage of the positive polarity. The total duration of the at least one positive reset cycle is equal to the total duration of the at least one negative reset cycle, and the voltage value of the common electrode voltage of the negative polarity in the at least one positive reset cycle is the same as the voltage value of the common electrode voltage of the positive polarity in the at least one negative display cycle.

13. The handwritten image display method of the active matrix cholesterol liquid crystal display device as described in claim 9, characterized in that, After generating the voltage control command, the device temperature of the active matrix cholesterol liquid crystal display device is further detected, and a temperature signal is generated based on the device temperature. The voltage control command is then adjusted using a temperature voltmeter based on the temperature signal.

14. The handwritten image display method of the active matrix cholesterol liquid crystal display device as described in claim 12, characterized in that, Further includes: The timing relationship between the background image parameter data, the vertical synchronization signal, and the data enable signal is adjusted based on device characteristic data. The duration of the screen reset procedure and the background image display procedure is also adjusted based on the timing relationship between the background image parameter data, the vertical synchronization signal, and the data enable signal. Alternatively, adjust a voltage parameter corresponding to each pixel in the background image parameter data based on the device characteristic data; The device's characteristic data includes information on the correlation between driving time and driving voltage corresponding to different material properties.

15. The handwritten image display method of the active matrix cholesterol liquid crystal display device as described in claim 12, characterized in that, Further includes: Based on user settings and display characteristics, the timing relationship between the background image parameter data, the vertical synchronization signal, and the data enable signal is adjusted. Based on the timing relationship between the background image parameter data, the vertical synchronization signal, and the data enable signal, the duration of the screen reset procedure and the background image display procedure is adjusted. Alternatively, adjust a voltage parameter corresponding to each pixel in the background image parameter data according to the user setting data and the display characteristic data; The user setting data includes different display parameters set for the active matrix cholesterol liquid crystal display device, and the display characteristic data includes the correlation information of driving time and driving voltage corresponding to different display parameters.

Images