Multi-gray-scale cholesteric liquid crystal display device and driving method thereof

Abstract

The invention belongs to the technical field of liquid crystal display, and discloses a multi-gray-scale cholesteric liquid crystal display device and a driving method thereof, according to the multi-gray-scale cholesteric liquid crystal display device and the driving method thereof, cholesterol liquid crystal of a pixel unit is controlled to be in a P state, an FC state and an intermediate stable state between the P state and the FC state through driving voltage, and the liquid crystal display effect is improved. And gray scale display of the pixel unit is realized. The driving time sequence of the bistable cholesterol liquid crystal is optimized, the proper driving voltage is selected, the cholesterol liquid crystal is controlled to be in an intermediate stable state through the driving voltage, and the display state of the cholesterol liquid crystal between the full-transmission state and the full-reflection state is increased, so that the gray scale number of the cholesteric phase display device is greatly increased on the premise that the number of sub-pixels is not increased, and the display effect of the cholesteric phase display device is improved. The display effect is improved.

Description

Technical Field

[0001] This invention relates to the field of cholesteric liquid crystal display technology, and more particularly to a multi-grayscale cholesteric liquid crystal display device and its driving method. Background Technology

[0002] Cholesteric liquid crystals are chiral nematic liquid crystals that rely on a twisted liquid crystal layer to reflect light of a specific wavelength. These liquid crystals possess bistable properties, allowing them to maintain their image even after power is off. The portion of circularly polarized light whose wavelength meets the specified criteria undergoes Bragg reflection; only one direction of circular polarization at that wavelength is reflected, while the other direction is transmitted. Light outside this wavelength range is also transmitted. Here, n is the average refractive index within the liquid crystal plane, and P is the pitch (which can be adjusted by regulating the chiral agent content). Depending on the applied voltage, cholesteric liquid crystals can form two stable states (P-state and FC-state) and one unstable state (H-state).

[0003] Unlike conventional LCDs that rely on power for display, cholesteric electronic paper displays typically utilize two stable states: P-state and FC-state. The P-state reflects ambient light as the bright state, while the FC-state, in conjunction with a light-absorbing layer, creates the dark state to display the image, thus achieving low power consumption. To achieve multi-color display, CN117116223A describes a method of dividing a single pixel into several sub-pixels of unequal area. Each sub-pixel is controlled by a separate semiconductor switch. Different combinations of the on and off states of the sub-pixels achieve different gray levels within a single-layer liquid crystal cell. For example, dividing a pixel into three sub-pixels, each with eight gray levels, and then stacking three liquid crystal cells, can achieve... This translates to 512 colors. However, this is still significantly less than the 16.7 million colors of a typical LCD panel. Furthermore, adding more colors requires dividing the pixels into more sub-pixels, necessitating a substantial increase in the actual resolution of the driving backplane and requiring more driving chips. This leads to increased costs for the display device. Additionally, the increased pixel density reduces the effective reflective area, decreasing the device's reflectivity and deteriorating the display quality. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention proposes a multi-grayscale cholesteric liquid crystal display device and its driving method.

[0005] The present invention proposes a multi-grayscale cholesteric liquid crystal display device, comprising: at least one display module and a driving module;

[0006] The display module includes a common substrate, an array substrate, and a cholesteric liquid crystal layer. The common substrate and the array substrate are disposed opposite to each other, and the cholesteric liquid crystal layer is sandwiched between them. A common electrode is provided on the side of the common substrate facing the cholesteric liquid crystal layer, and a pixel array formed by multiple pixel units is provided on the side of the array substrate facing the cholesteric liquid crystal layer. Each pixel unit includes a pixel electrode arranged corresponding to the common electrode.

[0007] The driving module is used to provide driving voltage to the pixel unit through the common electrode and the pixel electrode, so as to control the cholesteric liquid crystal corresponding to the pixel unit to be in the P state, FC state and the intermediate stable state between the two, so as to realize the grayscale display of the pixel unit.

[0008] Preferably, the cholesteric liquid crystal is in the P-state or FC-state, and is driven to transition from the P-state or FC-state to the intermediate stable state by an intermediate stable state driving voltage, V FC <V 中 <V P or V 中 <V FC R P <R 中 <R FC ;

[0009] Among them, V 中 V is the intermediate steady-state driving voltage of the cholesterol liquid crystal. P V is the driving voltage for the P-state of the cholesterol liquid crystal. FC R is the FC state driving voltage for cholesterol liquid crystal. P R represents the reflectance of cholesterol liquid crystal in the P state. FC R represents the reflectance of cholesterol liquid crystal in the FC state. 中 denoted as the reflectance of cholesterol liquid crystal in the intermediate steady state.

[0010] Preferably, the intermediate steady-state driving voltage includes at least one first intermediate steady-state driving voltage V. 1中 V FC <V 1中 <V P ;

[0011] And / or, the intermediate steady-state drive voltage includes at least one second intermediate steady-state drive voltage V. 2中 V 2中 <V FC .

[0012] Preferably, the intermediate steady-state driving voltage includes a plurality of first intermediate steady-state driving voltages V. 1中n When V 1中n <V 1中n+1 At that time, R 1中n <R 1中n+1 , where V 1中nR is the nth first intermediate steady-state driving voltage of the cholesteric liquid crystal. 1中n Let be the reflectance of the cholesterol liquid crystal in the nth first intermediate steady state, where n is a natural number and n≥1;

[0013] And / or, the intermediate steady-state drive voltage includes multiple second intermediate steady-state drive voltages V 2中m When V 2中m >V 2中m+1 At that time, R 2中m <R 2中m+1 , where V 2中m R is the m-th second intermediate steady-state driving voltage of the cholesterol liquid crystal. 2中m Let be the reflectance of the cholesterol liquid crystal in the m-th second intermediate steady state, where m is a natural number and m≥1.

[0014] Preferably, each pixel unit includes multiple sub-units, and each sub-unit includes a pixel electrode and a TFT device connecting the pixel electrode to the driving module, so that different pixel units exhibit the same or different gray levels.

[0015] Preferably, the display module includes multiple display modules, and at least two display modules have different colors of reflected light from their cholesteric liquid crystal layers.

[0016] This invention also proposes a multi-grayscale cholesteric liquid crystal display driving method, which controls the cholesteric liquid crystal of the pixel unit to be in the P state, FC state and intermediate stable state between the two by driving voltage, thereby realizing the grayscale display of the pixel unit.

[0017] Preferably, the cholesteric liquid crystal is in the P-state or FC-state, and is driven to transition from the P-state or FC-state to the intermediate stable state by an intermediate driving voltage, V FC <V 中 <V P or V 中 <V FC R P <R 中 <R FC ;

[0018] Among them, V 中 V is the intermediate steady-state driving voltage of the cholesterol liquid crystal. P V is the driving voltage for the P-state of the cholesterol liquid crystal. FC R is the FC state driving voltage for cholesterol liquid crystal. P R represents the reflectance of cholesterol liquid crystal in the P state. FC R represents the reflectance of cholesterol liquid crystal in the FC state. 中 denoted as the reflectance of cholesterol liquid crystal in the intermediate steady state.

[0019] Preferably, the intermediate steady-state driving voltage includes at least one first intermediate steady-state driving voltage V.1中 V FC <V 1中 <V P ;

[0020] And / or, the intermediate steady-state drive voltage includes at least one second intermediate steady-state drive voltage V. 2中 V 2中 <V FC .

[0021] Preferably, the intermediate steady-state driving voltage includes a plurality of first intermediate steady-state driving voltages V. 1中n When V 1中n <V 1中n+1 At that time, R 1中n <R 1中n+1 , where V 1中n R is the nth first intermediate steady-state driving voltage of the cholesteric liquid crystal. 1中n Let be the reflectance of the cholesterol liquid crystal in the nth first intermediate steady state, where n is a natural number and n≥1;

[0022] And / or, the intermediate steady-state drive voltage includes multiple second intermediate steady-state drive voltages V 2中m When V 2中m >V 2中m+1 At that time, R 2中m <R 2中m+1 , where V 2中m R is the m-th second intermediate steady-state driving voltage of the cholesterol liquid crystal. 2中m Let be the reflectance of the cholesterol liquid crystal in the m-th second intermediate steady state, where m is a natural number and m≥1.

[0023] Preferably, the cholesterol liquid crystal in the P state or FC state is switched from the P state or FC state to the first intermediate stable state by a first intermediate stable state driving voltage.

[0024] Preferably, the cholesterol liquid crystal in the P state is switched from the P state to the second intermediate stable state by a second intermediate stable state driving voltage;

[0025] And / or, the cholesterol liquid crystal in the FC state is first driven by the P-state driving voltage V. P The process involves switching from the FC state to the P state, and then driving the cholesteric liquid crystal from the P state to the second intermediate stable state using a second intermediate stable state driving voltage.

[0026] The proposed multi-grayscale cholesteric liquid crystal display device and its driving method in this invention control the cholesteric liquid crystal of the pixel unit to be in the P state, FC state, and an intermediate stable state between the two by driving voltage, thereby realizing the grayscale display of the pixel unit. By optimizing the driving timing of the bistable cholesteric liquid crystal and selecting a suitable driving voltage, the cholesteric liquid crystal is controlled to be in an intermediate stable state by driving voltage, increasing the display states of the cholesteric liquid crystal between full transparency and full reflection. Therefore, without increasing the number of sub-pixels, the number of grayscale levels of the cholesteric liquid crystal display device is greatly increased, and the display effect is improved. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of one embodiment of a multi-grayscale cholesteric liquid crystal display device proposed in this invention.

[0028] Figure 2 This is a cholesterol liquid crystal state transition diagram for a multi-grayscale cholesteric phase liquid crystal display device proposed in this invention.

[0029] Figure 3 This is a measured RV curve of the cholesterol liquid crystal initially in the P state in one embodiment of the multi-grayscale cholesteric phase liquid crystal display device proposed in this invention.

[0030] Figure 4 This is a measured RV curve of the cholesterol liquid crystal initially in the FC state in one embodiment of the multi-grayscale cholesteric phase liquid crystal display device proposed in this invention.

[0031] Figure 5 This is a schematic diagram of the sub-pixel division of a single pixel unit in one embodiment of a multi-grayscale cholesteric liquid crystal display device proposed in this invention.

[0032] Figure 6 This is a schematic diagram of another embodiment of the multi-grayscale cholesteric liquid crystal display device proposed in this invention.

[0033] Figure label: 1. Common substrate; 11. Common electrode; 2. Array substrate; 21. Pixel electrode; 3. Cholesterol liquid crystal layer. Detailed Implementation

[0034] like Figure 2As shown, cholesteric liquid crystals can form two stable states and one unstable state depending on the applied voltage. To achieve low power consumption, cholesteric display devices typically utilize both P-state and FC-state stable states for display. The P-state reflects ambient light as the bright state, while the FC-state, in conjunction with a light-absorbing layer, serves as the dark state to display the image. Therefore, existing cholesteric display devices usually only have two grayscale levels: bright and dark. In the initial P-state (stable state), when the input voltage is low, the liquid crystal is in a Bragg reflection state, also known as a planar textured state, or simply the P-state. Liquid crystals in the P-state can be processed by applying a certain pulse voltage V. FC Liquid crystal molecules are arranged randomly, forming a state similar to isotropic light, allowing incident light to pass through or scatter without any specific light being reflected. This state is called the focal conic state, or FC state for short (steady state). Input high pulse voltage V P At this point, all liquid crystal molecules are vertically aligned, and there is no birefringence in the horizontal direction, allowing incident light to pass through. This state is called the field-induced nematic state, or H state for short, and it is an unstable state. After the liquid crystal is powered off, it maintains the stable P state.

[0035] Reference Figure 1 The multi-grayscale cholesteric liquid crystal display device proposed in this embodiment includes: at least one display module and a driving module;

[0036] The display module includes a common substrate 1, an array substrate 2, and a cholesteric liquid crystal layer 3. The common substrate 1 and the array substrate 2 are arranged opposite to each other, and the cholesteric liquid crystal layer 3 is sandwiched between them. The common substrate 1 has a common electrode 11 on the side facing the cholesteric liquid crystal layer 3, and the array substrate 2 has a pixel array formed by multiple pixel units on the side facing the cholesteric liquid crystal layer 3. Each pixel unit includes a pixel electrode 21 arranged corresponding to the common electrode 11.

[0037] The driving module is used to provide driving voltage to the pixel unit through the common electrode 11 and the pixel electrode 21. The driving voltage controls the cholesteric liquid crystal corresponding to the pixel unit to be in the P state, FC state and the intermediate stable state between the two, so as to realize the grayscale display of the pixel unit.

[0038] In the specific selection of the intermediate steady-state voltage, when the cholesteric liquid crystal is in the P state, it is driven by applying the FC state driving voltage V. FC This allows for the transition from P-state to FC-state. A high pulse voltage V is input to the FC-state LCD. PThe liquid crystal molecules exist in an unstable H-state. Rapidly removing the voltage from the H-state liquid crystal allows for a transition from the H-state to the P-state. Slowly removing the voltage from the H-state liquid crystal to the FC-state allows for a transition from the H-state to the FC-state. Therefore, the intermediate stable state can be selected during the transition from the FC-state to the H-state, or during the transition from the P-state to the FC-state. That is, when the cholesteric liquid crystal is in the P-state or FC-state, it can be driven to transition from the P-state or FC-state to the intermediate stable state by an intermediate stable state driving voltage, V. FC <V 中 <V P or V 中 <V FC R P <R 中 <R FC Among them, V 中 V is the intermediate steady-state driving voltage of the cholesterol liquid crystal. P V is the driving voltage for the P-state of the cholesterol liquid crystal. FC R is the FC state driving voltage for cholesterol liquid crystal. P R represents the reflectance of cholesterol liquid crystal in the P state. FC R represents the reflectance of cholesterol liquid crystal in the FC state. 中 denoted as the reflectance of cholesterol liquid crystal in the intermediate steady state.

[0039] Due to the high transverse pressure characteristic of cholesterol liquid crystals, refer to Figure 3 Based on the measured RV curve of cholesteric liquid crystal, the curve is steep in the transition range between the P-state and FC-state. To facilitate precise voltage-refractive index control, different intermediate stable states can be selected during the transition from the P-state to the FC-state and from the FC-state to the P-state, thereby achieving different gray levels. Specifically, the intermediate stable state driving voltage includes at least one first intermediate stable state driving voltage V. 1中 V FC <V 1中 <V P The intermediate steady-state driving voltage includes at least one second intermediate steady-state driving voltage V. 2中 V 2中 <V FC In practice, the first and second intermediate stable states can be selected to achieve different gray levels, avoiding excessively small driving voltage intervals between adjacent gray levels within a single range, which would prevent the driver chip from controlling the gray levels precisely.

[0040] When multiple steady-state voltages are selected within the same intermediate steady-state range, the intermediate steady-state driving voltage in the intermediate steady-state between the P state and the FC state includes multiple first intermediate steady-state driving voltages V. 1中n When V 1中n <V 1中n+1 At that time, R 1中n <R 1中n+1 , where V1中n R is the nth first intermediate steady-state driving voltage of the cholesteric liquid crystal. 1中n Let V be the reflectance of the cholesteric liquid crystal in the nth first intermediate stable state, where n is a natural number and n≥1. Similarly, in the intermediate stable states from the FC state to the P state, the intermediate stable state driving voltage includes multiple second intermediate stable state driving voltages V. 2中m When V 2中m >V 2中m+1 At that time, R 2中m <R 2中m+1 , where V 2中m R is the m-th second intermediate steady-state driving voltage of the cholesterol liquid crystal. 2中m Let be the reflectance of the cholesterol liquid crystal in the m-th second intermediate steady state, where m is a natural number and m≥1.

[0041] In practical design, when selecting intermediate steady states within the same range, the processing capability of the driver chip must be considered when choosing between two adjacent intermediate steady states to accurately control the adjacent voltage interval. The corresponding reflectivity difference must also be considered to ensure uniformity of grayscale display. For example, the reflectivity difference between two adjacent intermediate steady states should be ≥20%, and the driving voltage difference should be ≥0.2V.

[0042] In specific driving methods, such as Figure 3 and 4 As shown in the measured RV diagram, when the liquid crystal is converted to the first intermediate stable state to achieve grayscale, regardless of whether the initial state of the cholesteric liquid crystal is in the P state or the FC state, the cholesteric liquid crystal is driven from the P state or the FC state to the first intermediate stable state by the first intermediate stable state driving voltage. When the liquid crystal is converted to the second intermediate stable state, the cholesteric liquid crystal in the P state can be driven from the P state to the second intermediate stable state by the second intermediate stable state driving voltage. However, for cholesteric liquid crystal in the FC state, if the second intermediate stable state driving voltage, which is lower than the FC state driving voltage, is applied directly, the cholesteric liquid crystal will not undergo a transition. It is necessary to first drive the cholesteric liquid crystal in the FC state with the P state driving voltage V. P The process involves switching from the FC state to the P state, and then driving the cholesteric liquid crystal from the P state to the second intermediate stable state using a second intermediate stable state driving voltage.

[0043] In practical design, to achieve multi-grayscale display in a cholesteric liquid crystal display device, the intermediate stable grayscale of this embodiment can be combined with the structure of the display module. Specifically, in the display module of the multi-grayscale cholesteric liquid crystal display device of this embodiment, each pixel unit includes multiple sub-units, and each sub-unit includes a pixel electrode and a TFT device connecting the pixel electrode and the driving module, so that different pixel units exhibit the same or different grayscale levels.

[0044] In one specific practical design approach, at least two sub-pixel electrode areas of each pixel unit are different. To increase the grayscale display of a pixel unit, the pixel electrode areas of different sub-units within a single pixel unit are not identical. For example... Figure 5 As shown, for example, if the area ratio of three sub-pixels S1, S2, and S3 is 1:2:3, it can ultimately achieve seven gray levels: 0, 1, 2, 3, 4, 5, and 6. According to the displayed Gamma curve, the different gray levels increase uniformly, resulting in a smooth transition between gray levels and a delicate image. Even if some area allocation methods of the tone curve can maximize the number of gray levels, such as a 1:3:5 ratio of three sub-pixels, which can achieve eight gray levels: 0, 1, 3, 4, 5, 6, 8, and 9, if the γ value in the Gamma curve is not 1, the brightness interval between adjacent gray levels will vary, leading to uneven transitions between gray levels and poor image detail. In this invention, the number of sub-pixels obtained from segmentation is limited, while ensuring the maximum number of achievable gray levels is also crucial. Therefore, in some embodiments of this invention, in the Gamma curve of the pixel unit, γ=1, and the output brightness corresponding to each gray level is proportional to the area or the sum of the areas of any lit sub-pixels within the corresponding pixel unit.

[0045] In one specific embodiment, by selecting a first intermediate stable driving voltage and a second intermediate stable driving voltage, the liquid crystal of a single pixel can achieve four gray levels: bright, first intermediate gray level, second intermediate gray level, and dark. Simultaneously, a single pixel is divided into three sub-pixels with an area ratio of 1:2:4. In this embodiment, a single pixel of a single liquid crystal module can achieve four gray levels. 3 There are 64 gray levels. This is achieved by combining pixel-to-subpixel segmentation with voltage-controlled intermediate states, allowing for more color display without increasing the number of driver chips or reducing the reflectivity of the display device.

[0046] In addition, in order to achieve multi-color display, such as Figure 6 As shown, the multi-grayscale cholesteric liquid crystal display device of this embodiment may include multiple display modules, and the cholesteric liquid crystal layers of at least two display modules reflect different colors of light. For example, the cholesteric liquid crystal layers of multiple liquid crystal modules reflect red (R), blue (B), and green (G) light respectively, and the three primary colors are superimposed to form a multi-grayscale color display effect. At this time, the grayscale is further expanded to (64). 3 It has multiple color gray levels, thus achieving full-color display.

[0047] In this embodiment, the proposed multi-grayscale cholesteric liquid crystal display device and its driving method control the cholesteric liquid crystal of the pixel unit to be in the P state, FC state, and an intermediate stable state between the two by driving voltage, thereby realizing the grayscale display of the pixel unit. By optimizing the driving timing of the bistable cholesteric liquid crystal and selecting a suitable driving voltage, the cholesteric liquid crystal is controlled to be in an intermediate stable state by driving voltage, increasing the display state of the cholesteric liquid crystal between full transparency and full reflection. Therefore, without increasing the number of sub-pixels, the number of grayscale levels of the cholesteric liquid crystal display device is greatly increased, and the display effect is improved.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-grayscale cholesteric liquid crystal display device, characterized in that, include: At least one display module and a driver module; The display module includes a common substrate, an array substrate, and a cholesteric liquid crystal layer. The common substrate and the array substrate are disposed opposite to each other, and the cholesteric liquid crystal layer is sandwiched between them. A common electrode is provided on the side of the common substrate facing the cholesteric liquid crystal layer, and a pixel array formed by multiple pixel units is provided on the side of the array substrate facing the cholesteric liquid crystal layer. Each pixel unit includes a pixel electrode arranged corresponding to the common electrode. The driving module is used to provide driving voltage to the pixel unit through the common electrode and the pixel electrode, so as to control the cholesteric liquid crystal corresponding to the pixel unit to be in the P state, FC state and the intermediate stable state between the two, so as to realize the grayscale display of the pixel unit.

2. The multi-grayscale cholesteric liquid crystal display device according to claim 1, characterized in that, Cholesterol liquid crystals are in the P-state or FC-state. A medium-stable-state driving voltage is used to drive the cholesterol liquid crystals from the P-state or FC-state to the medium-stable-state. V FC <V 中 <V P or V 中 <V FC R P <R 中 <R FC ; Among them, V 中 V is the intermediate steady-state driving voltage of the cholesterol liquid crystal. P V is the driving voltage for the P-state of the cholesterol liquid crystal. FC R is the FC state driving voltage of the cholesterol liquid crystal. P R represents the reflectance of cholesterol liquid crystal in the P state. FC R represents the reflectance of cholesterol liquid crystal in the FC state. 中 denoted as the reflectance of cholesterol liquid crystal in the intermediate steady state.

3. The multi-grayscale cholesteric liquid crystal display device according to claim 2, characterized in that, The intermediate steady-state drive voltage includes at least one first intermediate steady-state drive voltage V. 1中 V FC <V 1中 <V P ; And / or, the intermediate steady-state drive voltage includes at least one second intermediate steady-state drive voltage V. 2中 V 2中 <V FC .

4. The multi-grayscale cholesteric liquid crystal display device according to claim 3, characterized in that, The intermediate steady-state drive voltage includes multiple first intermediate steady-state drive voltages V 1中n When V 1中n <V 1中n+1 At that time, R 1中n <R 1中n+1 , where V 1中n R is the nth first intermediate steady-state driving voltage of the cholesteric liquid crystal. 1中n Let be the reflectance of the cholesterol liquid crystal in the nth first intermediate steady state, where n is a natural number and n≥1; And / or, the intermediate steady-state drive voltage includes multiple second intermediate steady-state drive voltages V 2中m When V 2中m >V 2中m+1 At that time, R 2中m <R 2中m+1 , where V 2中m R is the m-th second intermediate steady-state driving voltage of the cholesterol liquid crystal. 2中m Let be the reflectance of the cholesterol liquid crystal in the m-th second intermediate steady state, where m is a natural number and m≥1.

5. The multi-grayscale cholesteric liquid crystal display device according to any one of claims 1 to 4, characterized in that, Each pixel unit includes multiple sub-units, and each sub-unit includes a pixel electrode and a TFT device connecting the pixel electrode to the driving module, so that different pixel units exhibit the same or different gray levels.

6. The multi-grayscale cholesteric liquid crystal display device according to any one of claims 1 to 4, characterized in that, It includes multiple display modules, and at least two of the display modules have different colors of reflected light from the cholesteric liquid crystal layers.

7. A driving method for a multi-grayscale cholesteric liquid crystal display, characterized in that, By controlling the cholesteric liquid crystal of the pixel unit to be in the P state, FC state, or an intermediate stable state between the two by driving voltage, grayscale display of the pixel unit can be achieved.

8. The multi-grayscale cholesteric liquid crystal display driving method according to claim 7, characterized in that, Cholesterol liquid crystals are in the P-state or FC-state. An intermediate driving voltage is used to drive the cholesterol liquid crystals from the P-state or FC-state to an intermediate stable state. V FC <V 中 <V P or V 中 <V FC R P <R 中 <R FC ; Among them, V 中 V is the intermediate steady-state driving voltage of the cholesterol liquid crystal. P V is the driving voltage for the P-state of the cholesterol liquid crystal. FC R is the FC state driving voltage of the cholesterol liquid crystal. P R represents the reflectance of cholesterol liquid crystal in the P state. FC R represents the reflectance of cholesterol liquid crystal in the FC state. 中 denoted as the reflectance of cholesterol liquid crystal in the intermediate steady state.

9. The multi-grayscale cholesteric liquid crystal display driving method according to claim 8, characterized in that, The intermediate steady-state drive voltage includes at least one first intermediate steady-state drive voltage V. 1中 V FC <V 1中 <V P ; And / or, the intermediate steady-state drive voltage includes at least one second intermediate steady-state drive voltage V. 2中 V 2中 <V FC .

10. The multi-grayscale cholesteric liquid crystal display driving method according to claim 9, characterized in that, The intermediate steady-state drive voltage includes multiple first intermediate steady-state drive voltages V 1中n When V 1中n <V 1中n+1 At that time, R 1中n <R 1中n+1 , where V 1中n R is the nth first intermediate steady-state driving voltage of the cholesteric liquid crystal. 1中n Let be the reflectance of the cholesterol liquid crystal in the nth first intermediate steady state, where n is a natural number and n≥1; And / or, the intermediate steady-state drive voltage includes multiple second intermediate steady-state drive voltages V 2中m When V 2中m >V 2中m+1 At that time, R 2中m <R 2中m+1 , where V 2中m R is the m-th second intermediate steady-state driving voltage of the cholesterol liquid crystal. 2中m Let be the reflectance of the cholesterol liquid crystal in the m-th second intermediate steady state, where m is a natural number and m≥1.

11. The multi-grayscale cholesteric liquid crystal display driving method according to claim 8, characterized in that, The cholesterol liquid crystal in the P state or FC state is switched from the P state or FC state to the first intermediate stable state by the first intermediate stable state driving voltage.

12. The multi-grayscale cholesteric liquid crystal display driving method according to claim 8, characterized in that, The cholesterol liquid crystal in the P state is switched from the P state to the second intermediate stable state by the second intermediate stable state driving voltage; And / or, the cholesterol liquid crystal in the FC state is first driven by the P-state driving voltage V. P The process involves switching from the FC state to the P state, and then driving the cholesteric liquid crystal from the P state to the second intermediate stable state using a second intermediate stable state driving voltage.

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