Display panel, driving method thereof, and display device

Abstract

The application discloses a display panel and a driving method thereof and a display device. The display panel comprises a first array substrate, a second array substrate arranged opposite to the first array substrate, and a cholesteric liquid crystal layer between the first array substrate and the second array substrate. The first array substrate is provided with first pixel electrodes arranged in an array. The second array substrate is provided with second pixel electrodes arranged in an array. The projection of the first pixel electrodes on the second array substrate corresponds to the second pixel electrodes one by one. The first pixel electrodes and the corresponding second pixel electrodes are used to apply voltages with opposite polarities at the same time. The cholesteric liquid crystal layer is driven by the first array substrate and the second array substrate. The first pixel electrodes and the corresponding second pixel electrodes are used to apply voltages with opposite polarities at the same time. Therefore, the driving voltage of the display panel can be increased, and the display panel can be driven by using a conventional driving chip.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display panel and its driving method and display device. Background Technology

[0002] Display panels offer advantages such as thinness, durability, and low power consumption, which are energy-efficient and environmentally friendly. However, they require a backlight, resulting in a thicker module and higher cost. Electronic paper displays (reflective displays) have emerged as a solution to meet the needs of the general public. Unlike LCD displays, which require a backlight, electronic paper displays can use external light sources to display images. Therefore, even in strong sunlight, the information on the electronic paper remains clearly visible without viewing angle issues. Furthermore, due to their energy efficiency, high reflectivity, and high contrast ratio, electronic paper displays are now widely used in e-readers (such as e-books and e-newspapers) and other electronic components (such as price tags).

[0003] Existing electronic paper displays typically employ E-Ink microcapsule technology (microcapsule electronic ink technology), SiPix microcup technology (microcup electrophoretic display technology), Bridgestone electronic liquid powder technology, Cholesteric Liquid Crystal Display (CLCD) technology, microelectromechanical systems (MEMS) technology, or electrowetting technology. However, existing electronic paper display technologies are less mature than liquid crystal display technologies, have lower mass production efficiency, higher manufacturing costs, and cannot achieve color display.

[0004] Figure 1 This is a schematic diagram of the structure of a cholesterol liquid crystal reflective display in the prior art. For example... Figure 1 As shown, the prior art employs a cholesteric liquid crystal reflective display, including a counter substrate 1, an array substrate 2 disposed opposite to the counter substrate 1, and a cholesteric liquid crystal layer 3 located between the counter substrate 1 and the array substrate 2. In its reflective state, the cholesteric liquid crystal layer 3 can reflect one color and transmit other colors of light. The counter substrate 1 has a common electrode 4 covering its entire surface, and the array substrate 2 has pixel electrodes 5 arranged in an array, along with other electrodes (scan lines, data lines, and TFT switches, etc.) used to control the electrical signals on the pixel electrodes 5. A DC common voltage is applied to the common electrode 4, and a driving voltage is applied to the pixel electrodes 5. By creating different voltage differences between the pixel electrodes 5 and the common electrode 4, the cholesteric liquid crystal layer 3 is controlled to switch between reflective and transmissive states. Moreover, the cholesteric liquid crystal layer 3 can maintain this state even after power is turned off, achieving ultra-low refresh rates and low power consumption.

[0005] The cholesteric liquid crystal molecules in the cholesteric liquid crystal layer 3 possess three stable textures: P-state (Planar, reflective state), FC-state (Focal Conic, hazy state), and H-state (transparent state). Both the FC-state and H-state are light-transmitting states. In the P-state, the cholesteric liquid crystal's reflection spectrum is in the visible spectrum, reflecting bright colored light; the specific reflected color can be set according to the pitch of the cholesteric liquid crystal. In the FC-state, the cholesteric liquid crystal no longer reflects the aforementioned colored light, and light can be scattered and transmitted through it. In the H-state, the cholesteric liquid crystal no longer reflects the aforementioned colored light, and light can pass directly through it without scattering. Under a certain electric field, these three states can interconvert. The P-state (Planar, reflective state) and FC-state (Focal Conic, hazy state) are stable textures and do not require voltage to maintain, while the H-state (transparent state) requires voltage to maintain.

[0006] Figure 2 This is a schematic diagram illustrating the principle of the three state transitions of cholesterol liquid crystal molecules in existing technology. Figure 3 This is a schematic diagram of the driving signals for the three state transitions of cholesterol liquid crystal molecules in existing technology. For example... Figure 2 and Figure 3As shown, a common voltage signal Vcom is applied to the common electrode 4, and a first electrical signal V1 is continuously applied to the pixel electrode 5. There is a voltage difference (at least greater than 25V, for example, 30V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field is formed between the common electrode and the pixel electrode. The cholesterol liquid crystal molecules in the cholesterol liquid crystal layer 3 rotate and remain in the H state (transparent state). A common voltage signal Vcom is applied to the common electrode 4, and a second electrical signal V2 is applied to the pixel electrode 5. There is a voltage difference (at least greater than 25V, for example, 30V) between the second electrical signal V2 and the common voltage signal Vcom. The second electrical signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time T1. That is, the second electrical signal V2 first has a large voltage difference with the common voltage signal Vcom, and then slowly decreases and becomes the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the common electrode 4 and the pixel electrode 5. This field then slowly disappears, causing the cholesterol liquid crystal molecules in the cholesterol liquid crystal layer 3 to rotate and remain stationary in the FC state, a scattering state with a light-scattering effect. A common voltage signal Vcom is applied to the common electrode 4, and a third electrical signal V3 is applied to the pixel electrode 5. There is a voltage difference (at least greater than 25V, for example, 30V) between the third electrical signal V3 and the common voltage signal Vcom. Within a second preset time T2, the third electrical signal V3 directly becomes the same as the common voltage signal Vcom. The second preset time T2 is less than the first preset time T1, meaning the third electrical signal V3 initially has a large voltage difference with the common voltage signal Vcom, then rapidly decreases and becomes the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the common electrode 4 and the pixel electrode 5. This field then rapidly disappears, causing the cholesterol liquid crystal molecules in the cholesterol liquid crystal layer 3 to rotate and remain stationary in the P state, a reflection state. The different arrangements of the cholesterol liquid crystal molecules result in different reflected visible light spectra, while the remaining spectrum is transmitted. The reflection spectrum band (Δλ) of cholesterol liquid crystal molecules is proportional to the pitch (Po) and birefringence (Δn = ne - no) of cholesterol liquid crystal molecules, and the formula is: Δλ = PoΔn. Therefore, cholesterol liquid crystal molecules with different pitches can reflect different colors of light in the reflective state.

[0007] Because the driving voltage of the cholesteric liquid crystal layer 3 is as high as 25V or more, there are almost no driving chips on the market that can support it. The highest voltage of the existing supporting driving chips is 15V. This means that cholesteric liquid crystal reflective displays need to use more expensive special driving chips, resulting in higher manufacturing costs. Summary of the Invention

[0008] In order to overcome the shortcomings and deficiencies of the prior art, the present invention aims to provide a display panel and its driving method and display device, so as to solve the problem that conventional driving chips in the prior art cannot be applied to cholesteric liquid crystal reflective displays.

[0009] The objective of this invention is achieved through the following technical solution:

[0010] The present invention provides a display panel, including a first array substrate, a second array substrate disposed opposite to the first array substrate, and a cholesteric liquid crystal layer located between the first array substrate and the second array substrate. The first array substrate is provided with first pixel electrodes arranged in an array, and the second array substrate is provided with second pixel electrodes arranged in an array. The projection of the first pixel electrode on the second array substrate corresponds one-to-one with the second pixel electrode. The first pixel electrode and the second pixel electrode corresponding to the first pixel electrode are applied with voltages of opposite polarities at the same time or with the same voltage.

[0011] Furthermore, a plurality of first pixel units are formed on the first array substrate by multiple first scan lines and multiple first data lines that are mutually insulated and intersecting. Each first pixel unit is provided with a first pixel electrode and a first thin film transistor. The first pixel electrode is electrically connected to the corresponding first scan line and first data line through the first thin film transistor.

[0012] The second array substrate is formed by multiple second scan lines and multiple second data lines that are mutually insulated and intersecting to form multiple second pixel units. Each second pixel unit is provided with a second pixel electrode and a second thin film transistor. The second pixel electrode is electrically connected to the corresponding second scan line and second data line through the second thin film transistor.

[0013] The projection of the first pixel unit onto the second array substrate corresponds one-to-one with the second pixel unit; the projection of the first scan line onto the second array substrate corresponds one-to-one with the second scan line; the projection of the first data line onto the second array substrate corresponds one-to-one with the second data line; and the projection of the first thin-film transistor onto the second array substrate corresponds one-to-one with the second thin-film transistor.

[0014] Furthermore, the first array substrate is provided with a first bonding area, and the second array substrate is provided with a second bonding area, the first bonding area and the second bonding area are respectively located on opposite sides of the display panel.

[0015] Furthermore, the display panel includes a driver chip and a signal distributor. The driver chip is electrically connected to the signal distributor and is used to input a drive signal to the signal distributor. The drive lines on the first array substrate and the second array substrate are both electrically connected to the same signal distributor. The signal distributor is used to distribute the drive signal to the drive lines on the first array substrate and the second array substrate simultaneously.

[0016] Furthermore, the driving chip includes a data driving chip and a scan driving chip, and the signal distributor includes a data signal distributor and a scan signal distributor. The data driving chip is electrically connected to the data signal distributor and is used to input data driving signals to the data signal distributor. The data driving lines on the first array substrate and the second array substrate are all electrically connected to the same data signal distributor. The data signal distributor is used to simultaneously distribute the data driving signals to the data driving lines on the first array substrate and the second array substrate. The scan driving chip is electrically connected to the scan signal distributor and is used to input scan driving signals to the scan signal distributor. The scan lines on the first array substrate and the second array substrate are all electrically connected to the same scan signal distributor. The scan signal distributor is used to simultaneously distribute the scan driving signals to the scan driving lines on the first array substrate and the second array substrate.

[0017] This application also provides a display device, including the display panel described above.

[0018] Furthermore, the number of display panels is three, namely a red display panel, a green display panel, and a blue display panel stacked on top of each other. The red display panel, the green display panel, and the blue display panel reflect red light, green light, and blue light respectively in the reflective state. The pixel units of the red display panel, the green display panel, and the blue display panel are aligned with each other.

[0019] And / or, the display device is provided with a light-absorbing layer that covers the entire surface, the light-absorbing layer being located on the side of the display panel away from the external environment.

[0020] This application also provides a driving method for a display panel, used to drive the display panel as described above, the driving method comprising:

[0021] A first driving voltage is applied to a first pixel electrode, and a second driving voltage is applied to a second pixel electrode corresponding to the first pixel electrode. The first driving voltage and the second driving voltage have opposite polarities or are the same voltage at the same time.

[0022] Furthermore, the first array substrate is provided with multiple first scan lines and multiple first data lines, and the second array substrate is provided with multiple second scan lines and multiple second data lines. The projections of the first scan lines on the second array substrate correspond one-to-one with the second scan lines, and the projections of the first data lines on the second array substrate correspond one-to-one with the second data lines.

[0023] The driving method includes:

[0024] The first scan line and the second scan line corresponding to the first scan line are scanned synchronously. At the same time, the first data line and the second data line corresponding to the first data line are respectively applied with the first driving voltage and the second driving voltage.

[0025] Furthermore, the display panel includes a driver chip and a signal distributor. The driver chip is electrically connected to the signal distributor and is used to input a drive signal to the signal distributor. The drive lines on the first array substrate and the second array substrate are both electrically connected to the same signal distributor. The signal distributor is used to distribute the drive signal to the drive lines on the first array substrate and the second array substrate.

[0026] The driving method includes:

[0027] The signal distributor is controlled to simultaneously distribute the corresponding drive signals to the drive lines on the first array substrate and the second array substrate.

[0028] The beneficial effects of this invention are as follows: by corresponding the first pixel electrode on the first array substrate with the second pixel electrode on the second array substrate, and applying voltages of opposite polarity to the first pixel electrode and the second pixel electrode corresponding to the first pixel electrode at the same time, the first array substrate and the second array substrate are used together to drive the cholesteric liquid crystal layer. Thus, the driving voltage of the display panel can be increased without changing the driving voltage on a single array substrate. Even if a conventional driving chip is used, the cholesteric liquid crystal layer can be driven, which greatly reduces the driving difficulty and manufacturing cost. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a cholesterol liquid crystal reflective display in the prior art;

[0030] Figure 2 This is a schematic diagram illustrating the principle of the three state transitions of cholesterol liquid crystal molecules in existing technology;

[0031] Figure 3 This is a schematic diagram of the driving signals for the three state transitions of cholesterol liquid crystal molecules in the prior art;

[0032] Figure 4 This is a schematic diagram of the display device in the reflective state according to Embodiment 1 of the present invention;

[0033] Figure 5 yes Figure 4 A schematic diagram of the structure of a single sub-pixel in the reflection state;

[0034] Figure 6 This is a schematic diagram of the display device in the transmission state according to Embodiment 1 of the present invention;

[0035] Figure 7 yes Figure 6 A schematic diagram of the structure of a single sub-pixel in the transmission state;

[0036] Figure 8 This is a schematic diagram of the planar structure of the display panel in Embodiment 1 of the present invention;

[0037] Figure 9 This is a schematic diagram of the circuit structure of the data driving signal on the display panel in Embodiment 1 of the present invention;

[0038] Figure 10 This is a schematic diagram of the circuit structure of the scanning drive signal on the display panel in Embodiment 1 of the present invention;

[0039] Figure 11 This is a schematic diagram of the planar structure of the first array substrate in the top view of the display panel in Embodiment 1 of the present invention;

[0040] Figure 12 This is a schematic diagram of the planar structure of the second array substrate in the top view of the display panel in Embodiment 1 of the present invention;

[0041] Figure 13 This is a waveform diagram of the scanning drive signal on the display panel in Embodiment 1 of the present invention;

[0042] Figure 14 This is a waveform diagram of the data driving signal on the display panel in Embodiment 1 of the present invention;

[0043] Figure 15 This is a schematic diagram of the reflective display device in Embodiment 2 of the present invention when displaying a red image;

[0044] Figure 16 This is a schematic diagram of the reflective display device in Embodiment 2 of the present invention when displaying a green image;

[0045] Figure 17 This is a schematic diagram of the reflective display device in Embodiment 2 of the present invention when displaying a blue image;

[0046] Figure 18 This is a schematic diagram of the reflective display device in the white state according to Embodiment 2 of the present invention;

[0047] Figure 19 This is a schematic diagram of the reflective display device in the black state in Embodiment 2 of the present invention. Detailed Implementation

[0048] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, provides a detailed explanation of the specific implementation methods, structures, features, and effects of the display panel and its driving method, and the display device proposed according to the present invention:

[0049] [Example 1]

[0050] Figure 4 This is a schematic diagram of the display device in the reflective state according to Embodiment 1 of the present invention. Figure 5 yes Figure 4 A schematic diagram of the structure of a single sub-pixel in the reflection state. Figure 6 This is a schematic diagram of the display device in the transmission state according to Embodiment 1 of the present invention. Figure 7 yes Figure 6 A schematic diagram of the structure of a single sub-pixel in the transmission state. Figure 8 This is a schematic diagram of the planar structure of the display panel in Embodiment 1 of the present invention. Figure 9 This is a schematic diagram of the circuit structure of the data driving signal on the display panel in Embodiment 1 of the present invention. Figure 10 This is a schematic diagram of the circuit structure of the scanning drive signal on the display panel in Embodiment 1 of the present invention. Figure 11 This is a schematic diagram of the planar structure of the first array substrate in the top view of the display panel in Embodiment 1 of the present invention. Figure 12 This is a schematic diagram of the planar structure of the second array substrate in the top view of the display panel in Embodiment 1 of the present invention.

[0051] like Figures 4 to 12 As shown, a display panel 100 provided in Embodiment 1 of the present invention includes a first array substrate 10, a second array substrate 20 disposed opposite to the first array substrate 10, and a cholesteric liquid crystal layer 30 located between the first array substrate 10 and the second array substrate 20. The cholesteric liquid crystal layer 30, in its reflective state, can reflect light of a single color and transmit light of other colors, while in its transmissive state, it can transmit all light, thereby enabling the display panel 100 to achieve color display using ambient light.

[0052] like Figures 4-6 , Figure 11 and Figure 12As shown, the first array substrate 10 has first pixel electrodes 14 arranged in an array, and the second array substrate 20 has second pixel electrodes 24 arranged in an array. The projections of the first pixel electrodes 14 onto the second array substrate 20 correspond one-to-one with the second pixel electrodes 24. The first pixel electrodes 14 and the corresponding second pixel electrodes 24 are applied with opposite polarities or the same voltage at the same time. That is, the cholesteric liquid crystal layer 30 is driven by the vertical electric field between the first pixel electrodes 14 and the second pixel electrodes 24. Thus, the driving voltage of the display panel 100 can be increased without changing the driving voltage on a single array substrate. Even with a conventional driving chip, the cholesteric liquid crystal layer 30 can be driven, greatly reducing the driving difficulty and manufacturing cost. Of course, when the cholesteric liquid crystal layer 30 in the pixel unit is in a steady state, the first pixel electrode 14 and the corresponding second pixel electrode 24 are both applied with the same voltage at the same time, so that there is no voltage difference between the first pixel electrode 14 and the second pixel electrode 24. For example, both the first pixel electrode 14 and the second pixel electrode 24 are applied with a voltage of 0V. That is, when a voltage difference needs to be formed between the first pixel electrode 14 and the second pixel electrode 24 corresponding to the first pixel electrode 14, the first pixel electrode 14 and the second pixel electrode 24 corresponding to the first pixel electrode 14 are used to apply voltages of opposite polarities at the same time; when a voltage difference does not need to be formed between the first pixel electrode 14 and the second pixel electrode 24 corresponding to the first pixel electrode 14, the first pixel electrode 14 and the second pixel electrode 24 corresponding to the first pixel electrode 14 are both applied with the same voltage.

[0053] Furthermore, a plurality of first pixel units P1 are formed on the first array substrate 10 by multiple first scan lines 111 and multiple first data lines 131 that are mutually insulated and intersecting. Each first pixel unit P1 is provided with a first pixel electrode 14 and a first thin-film transistor 102. The first pixel electrode 14 is electrically connected to the corresponding first scan line 111 and first data line 131 through the first thin-film transistor 102, so that the driving voltage on each first pixel electrode 14 can be controlled by the first scan line 111, the first data line 131, and the first thin-film transistor 102. For example, Figure 5 , Figure 7 as well as Figure 11 As shown, the first thin-film transistor 102 includes a first gate 112, a first active layer 12, a first source 132, and a first drain 133. The first gate 112 is located on the same layer as the first scan line 111 and is electrically connected. The first gate 112 and the first active layer 12 are isolated by an insulating layer. The first source 132 is electrically connected to the first data line 131. The first drain 133 is electrically connected to the first pixel electrode 14 through a contact hole.

[0054] Multiple second pixel units P2 are formed on the second array substrate 20 by multiple second scan lines 211 and multiple second data lines 231 that are mutually insulated and intersecting. Each second pixel unit P2 is provided with a second pixel electrode 24 and a second thin-film transistor 202. The second pixel electrode 24 is electrically connected to the corresponding second scan line 211 and second data line 231 through the second thin-film transistor 202, so that the driving voltage on each second pixel electrode 24 can be controlled by the second scan line 211, the second data line 231 and the second thin-film transistor 202. For example, Figure 5 , Figure 7 as well as Figure 12 As shown, the second thin-film transistor 202 includes a second gate 212, a second active layer 22, a second source 232, and a second drain 233. The second gate 212 is located on the same layer as the second scan line 211 and is electrically connected. The second gate 212 and the second active layer 22 are isolated by an insulating layer. The second source 232 is electrically connected to the second data line 231. The second drain 233 is electrically connected to the second pixel electrode 24 through a contact hole.

[0055] The projections of the first pixel unit P1 onto the second array substrate 20 correspond one-to-one with the projections of the second pixel unit P2, the projections of the first scan line 111 onto the second array substrate 20 correspond one-to-one with the projections of the second scan line 211, the projections of the first data line 131 onto the second array substrate 20 correspond one-to-one with the projections of the second data line 231, and the projections of the first thin-film transistor 102 onto the second array substrate 20 correspond one-to-one with the projections of the second thin-film transistor 202. For example, the projections of the first pixel unit P1 onto the second array substrate 20 coincide with the projections of the second pixel unit P2, the projections of the first scan line 111 onto the second array substrate 20 coincide with the projections of the second scan line 211, the projections of the first data line 131 onto the second array substrate 20 coincide with the projections of the second data line 231, and the projections of the first thin-film transistor 102 onto the second array substrate 20 coincide with the projections of the second thin-film transistor 202. This ensures that the transmittance of the display panel 100 is not affected, thereby maximizing the aperture ratio.

[0056] The first scan line 111, the first data line 131, the first thin film transistor 102, and the first pixel electrode 14 are all disposed on the side of the first array substrate 10 facing the cholesteric liquid crystal layer 30, and the second scan line 211, the second data line 231, the second thin film transistor 202, and the second pixel electrode 24 are all disposed on the side of the second array substrate 20 facing the cholesteric liquid crystal layer 30. The first array substrate 10 and the second array substrate 20 are mirror images of each other.

[0057] like Figure 8As shown, a first bonding region 101 is provided on the upper surface of the first array substrate 10 (facing the cholesteric liquid crystal layer 30), and a second bonding region 201 is provided on the upper surface of the second array substrate 20 (facing the cholesteric liquid crystal layer 30). The first bonding region 101 and the second bonding region 201 are located on opposite sides of the display panel 100, for example, on the upper and lower sides of the display panel 100, respectively, which facilitates bonding the first bonding region 101 and the second bonding region 201 respectively and reduces the bonding difficulty. The first scan line 111 and the first data line 131 both extend to the first bonding region 101, thereby bonding the first bonding region 101 to the external flexible circuit board; the second scan line 211 and the second data line 231 both extend to the second bonding region 201, thereby bonding the second bonding region 201 to the external flexible circuit board. For example, during the bonding process, the second bonding area 201 on the second array substrate 20 can be bonded first, and then the display panel 100 can be flipped up and down to bond the first bonding area 10 of the first array substrate 10.

[0058] In this embodiment, the display panel 100 includes a driver chip and a signal distributor. The driver chip is electrically connected to the signal distributor and is used to input a drive signal to the signal distributor. The drive lines on the first array substrate 10 and the second array substrate 20 are both electrically connected to the same signal distributor. The signal distributor is used to simultaneously distribute the drive signal to the drive lines on the first array substrate 10 and the second array substrate 20. The driver chip sends the signal source to the signal distributor, which then splits the drive signal into two and simultaneously distributes them to the drive lines on the first array substrate 10 and the second array substrate 20, thereby enabling simultaneous control of synchronous refresh of the first array substrate 10 and the second array substrate 20.

[0059] like Figure 9 and Figure 10As shown, the driving chip includes a data driving chip 210 and a scan driving chip 310, and the signal distributor includes a data signal distributor 220 and a scan signal distributor 320. The data driving chip 210 is electrically connected to the data signal distributor 220 and is used to input data driving signals to the data signal distributor 220. The data driving lines on the first array substrate 10 and the second array substrate 20 are all electrically connected to the same data signal distributor 220. The data signal distributor 220 is used to distribute the data driving signals to the data driving lines on the first array substrate 10 and the second array substrate 20. The scan driver chip 310 is electrically connected to the scan signal distributor 320 and is used to input scan drive signals to the scan signal distributor 320. The scan lines on the first array substrate 10 and the second array substrate 20 are both electrically connected to the same scan signal distributor 320. The scan signal distributor 320 is used to distribute the scan drive signals to the scan drive lines on the first array substrate 10 and the second array substrate 20, so that the first scan line 111 on the first array substrate 10 is scanned sequentially from the end near the first bonding region 101 to the end away from the first bonding region 101, and the second scan line 211 on the second array substrate 20 is scanned sequentially from the end away from the second bonding region 201 to the end near the second bonding region 201, so as to ensure that the first scan line 111 and the second scan line 211 corresponding to the first scan line 111 are scanned synchronously.

[0060] The first array substrate 10 and the second array substrate 20 can be made of materials such as glass, acrylic, and polycarbonate. The first pixel electrode 14 and the second pixel electrode 24 can be made of materials such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0061] like Figure 4 and Figure 5 As shown, when the display panel 100 is in a reflective state, a first driving voltage (e.g., +15V) is applied to the first pixel electrode 14, and a second driving voltage (e.g., -15V) is applied to the second pixel electrode 24 corresponding to the first pixel electrode 14. The first driving voltage and the second driving voltage have opposite polarities at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then, the first driving voltage and the second driving voltage quickly become the same voltage (e.g., both are 0V). That is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V), and then quickly decrease to 0V. Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24, and then the vertical electric field quickly disappears, causing the cholesterol liquid crystal molecules in the cholesterol liquid crystal layer 30 to rotate and stagnate in the P state, which is the reflective state.

[0062] like Figure 6 and Figure 7As shown, when the display panel 100 is in the transmission state, a first driving voltage (e.g., +15V) is applied to the first pixel electrode 14, and a second driving voltage (e.g., -15V) is applied to the second pixel electrode 24 corresponding to the first pixel electrode 14. The first driving voltage and the second driving voltage have opposite polarities at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then, the first driving voltage and the second driving voltage slowly become the same voltage (e.g., both are 0V). That is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V), and then slowly decrease to 0V. Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24, and then the vertical electric field slowly disappears, causing the cholesterol liquid crystal molecules in the cholesterol liquid crystal layer 30 to rotate and stagnate in the FC state, which is a scattering state and has a light-scattering effect. Of course, when the display panel 100 is in the transmission state, a first driving voltage (e.g., +15V) can be continuously applied to the first pixel electrode 14, and a second driving voltage (e.g., -15V) can be applied to the second pixel electrode 24 corresponding to the first pixel electrode 14, so that there is always a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24, and a strong vertical electric field will always be formed between the first pixel electrode 14 and the second pixel electrode 24, and the cholesterol liquid crystal molecules in the cholesterol liquid crystal layer 30 will rotate and remain in the H state (transparent state).

[0063] like Figure 4 and Figure 6 As shown, this application also provides a display device, including a display panel 100 as described above. The number of display panels 100 is one, thereby enabling single-color image display. The display device includes a light-absorbing layer 400 covering its entire surface. The light-absorbing layer 400 is disposed on the side of the display panel 100 away from the external environment. For example, the light-absorbing layer 400 is disposed on the side of the second array substrate 20 away from the first array substrate 10, i.e., the first array substrate 10 is disposed on the side of the display panel 100 closer to the external environment. The light-absorbing layer 400 can absorb light passing through the display panel 100, enabling the display device to achieve a black state.

[0064] Figure 13 This is a waveform diagram of the scanning drive signal on the display panel in Embodiment 1 of the present invention. Figure 14 This is a waveform diagram of the data driving signal on the display panel in Embodiment 1 of the present invention. For example... Figure 13 and Figure 14 As shown, this application also provides a driving method for a display panel, used to drive the display panel 100 as described above. The driving method includes:

[0065] A first driving voltage is applied to the first pixel electrode 14, and a second driving voltage is simultaneously applied to the second pixel electrode 24 corresponding to the first pixel electrode 14. The first driving voltage and the second driving voltage have opposite polarities or are the same voltage (e.g., both are 0V) at the same time. When a voltage difference needs to be formed between the first pixel electrode 14 and the second pixel electrode 24 corresponding to the first pixel electrode 14, the first driving voltage and the second driving voltage are applied with opposite polarities at the same time; when a voltage difference does not need to be formed between the first pixel electrode 14 and the second pixel electrode 24 corresponding to the first pixel electrode 14, the first driving voltage and the second driving voltage are both applied with the same voltage. By applying voltages with opposite polarities or the same voltage to the first pixel electrode 14 and the second pixel electrode 24 corresponding to the first pixel electrode 14 at the same time, even if the amplitudes of the first driving voltage and the second driving voltage are small, a large voltage difference can be formed between the first pixel electrode 14 and the second pixel electrode 24 to drive the cholesteric liquid crystal layer 30. Therefore, the driving voltage on a single array substrate can be reduced, and the cholesteric liquid crystal layer can be driven even using conventional driving chips, greatly reducing the driving difficulty and manufacturing cost.

[0066] Furthermore, the first driving voltage and the second driving voltage have the same amplitude at the same time, and the first driving voltage and the second driving voltage have the same frequency, for example, the first driving voltage is +15V and the second driving voltage is -15V; or, the first driving voltage and the second driving voltage are both the same voltage at the same time, for example, both are 0V.

[0067] Furthermore, a plurality of first pixel units P1 are formed on the first array substrate 10 by multiple first scan lines 111 and multiple first data lines 131 that are mutually insulated and intersecting. Each first pixel unit P1 is provided with a first pixel electrode 14 and a first thin-film transistor 102. The first pixel electrode 14 is electrically connected to the corresponding first scan line 111 and first data line 131 through the first thin-film transistor 102, so that the driving voltage on each first pixel electrode 14 can be controlled by the first scan line 111, the first data line 131, and the first thin-film transistor 102. For example, Figure 5 , Figure 7 as well as Figure 11As shown, the first thin-film transistor 102 includes a first gate 112, a first active layer 12, a first source 132, and a first drain 133. The first gate 112 is located on the same layer as the first scan line 111 and is electrically connected. The first gate 112 and the first active layer 12 are isolated by an insulating layer. The first source 132 is electrically connected to the first data line 131, and the first drain 133 is electrically connected to the first pixel electrode 14 through a contact hole. Multiple second pixel units P2 are formed on the second array substrate 20 by multiple second scan lines 211 and multiple second data lines 231 that are mutually insulated and intersecting. Each second pixel unit P2 is provided with a second pixel electrode 24 and a second thin-film transistor 202. The second pixel electrode 24 is electrically connected to the corresponding second scan line 211 and second data line 231 through the second thin-film transistor 202, thereby controlling the driving voltage on each second pixel electrode 24 through the second scan line 211, the second data line 231, and the second thin-film transistor 202. Wherein, as... Figure 5 , Figure 7 as well as Figure 12 As shown, the second thin-film transistor 202 includes a second gate 212, a second active layer 22, a second source 232, and a second drain 233. The second gate 212 is located on the same layer as the second scan line 211 and is electrically connected. The second gate 212 and the second active layer 22 are isolated by an insulating layer. The second source 232 is electrically connected to the second data line 231. The second drain 233 is electrically connected to the second pixel electrode 24 through a contact hole.

[0068] The projections of the first pixel unit P1 onto the second array substrate 20 correspond one-to-one with the projections of the second pixel unit P2, the projections of the first scan line 111 onto the second array substrate 20 correspond one-to-one with the projections of the second scan line 211, the projections of the first data line 131 onto the second array substrate 20 correspond one-to-one with the projections of the second data line 231, and the projections of the first thin-film transistor 102 onto the second array substrate 20 correspond one-to-one with the projections of the second thin-film transistor 202. For example, the projections of the first pixel unit P1 onto the second array substrate 20 coincide with the projections of the second pixel unit P2, the projections of the first scan line 111 onto the second array substrate 20 coincide with the projections of the second scan line 211, the projections of the first data line 131 onto the second array substrate 20 coincide with the projections of the second data line 231, and the projections of the first thin-film transistor 102 onto the second array substrate 20 coincide with the projections of the second thin-film transistor 202. This ensures that the transmittance of the display panel 100 is not affected, thereby maximizing the aperture ratio.

[0069] The driving method includes: a first scan line 111 and a second scan line 211 corresponding to the first scan line 111 are scanned synchronously; simultaneously, a first driving voltage and a second driving voltage are applied to a first data line 131 and a second data line 231 corresponding to the first data line 131, respectively. Figures 11 to 14 As shown, in the top-to-bottom direction of the display panel 100, multiple first scan lines 111 are sequentially named G1, G2, G3…Gn, starting from the end closest to the first binding area 101 and moving towards the end furthest from the first binding area 101. Multiple second scan lines 211 are sequentially named G1ˊ, G2ˊ, G3ˊ…Gnˊ, starting from the end furthest from the second binding area 201 and moving towards the end closest to the second binding area 201. In the left-to-right direction of the display panel 100, multiple first data lines 131 are sequentially named D1, D2, D3…Dn, and multiple second data lines 231 are sequentially named D1ˊ, D2ˊ, D3ˊ…Dnˊ. G1 corresponds to G1ˊ, G2 to G2ˊ, G3 to G3ˊ…Gn to Gnˊ, and D1 corresponds to D1ˊ, D2 to D2ˊ, D3 to D3ˊ…Dn to Dnˊ. When the display panel 100 refreshes the screen, multiple first scan lines 111 scan sequentially from top to bottom, i.e., G1, G2, G3…Gn scan sequentially; simultaneously, multiple second scan lines 211 scan synchronously from top to bottom, i.e., G1ˊ, G2ˊ, G3ˊ…Gnˊ scan sequentially. When refreshing the same row of sub-pixels, D1 and D1ˊ, D2 and D2ˊ, D3 and D3ˊ…Dn and Dnˊ apply driving voltages of opposite polarities, but the polarity between any two first data lines 131 is not limited, and the polarity between any two second data lines 231 is not limited. The polarities of the first driving voltage and the second driving voltage are reversed once per row of sub-pixels scanned, or they can be reversed once per frame, so that each sub-pixel can be controlled independently.

[0070] In this embodiment, the display panel 100 includes a driver chip and a signal distributor. The driver chip is electrically connected to the signal distributor and is used to input a drive signal to the signal distributor. The drive lines on the first array substrate 10 and the second array substrate 20 are both electrically connected to the same signal distributor. The signal distributor is used to distribute the drive signal to the drive lines on the first array substrate 10 and the second array substrate 20. The driving method includes:

[0071] The control signal distributor simultaneously distributes corresponding drive signals to the drive lines on the first array substrate 10 and the second array substrate 20. The drive chip sends the signal source to the signal distributor, which then splits the drive signal into two and distributes them simultaneously to the drive lines on the first array substrate 10 and the second array substrate 20, thereby enabling simultaneous control of the first array substrate 10 and the second array substrate 20 to perform synchronous refresh.

[0072] refer to Figure 9 and Figure 10As shown, the driving chip includes a data driving chip 210 and a scan driving chip 310, and the signal distributor includes a data signal distributor 220 and a scan signal distributor 320. The data driving chip 210 is electrically connected to the data signal distributor 220 and is used to input data driving signals to the data signal distributor 220. The data driving lines on the first array substrate 10 and the second array substrate 20 are all electrically connected to the same data signal distributor 220. The data signal distributor 220 is used to distribute the data driving signals to the data driving lines on the first array substrate 10 and the second array substrate 20. The scan driving chip 310 is electrically connected to the scan signal distributor 320 and is used to input scan driving signals to the scan signal distributor 320. The scan lines on the first array substrate 10 and the second array substrate 20 are all electrically connected to the same scan signal distributor 320. The scan signal distributor 320 is used to distribute the scan driving signals to the scan driving lines on the first array substrate 10 and the second array substrate 20. The driving method includes:

[0073] The control data signal distributor 220 simultaneously distributes corresponding data driving signals (first driving voltage, second driving voltage) to the data driving lines (first data line 131, second data line 231) on the first array substrate 10 and the second array substrate 20, and controls the scan signal distributor 320 simultaneously distributes corresponding scan driving signals to the scan driving lines (first scan line 111, second scan line 211) on the first array substrate 10 and the second array substrate 20.

[0074] [Example 2]

[0075] Figure 15 This is a schematic diagram of the reflective display device in Embodiment 2 of the present invention when displaying a red image. Figure 16 This is a schematic diagram of the reflective display device in Embodiment 2 of the present invention when displaying a green image. Figure 17 This is a schematic diagram of the reflective display device in Embodiment 2 of the present invention when displaying a blue image. Figure 18 This is a schematic diagram of the reflective display device in the white state in Embodiment 2 of the present invention. Figure 19 This is a schematic diagram of the reflective display device in the black state according to Embodiment 2 of the present invention. Figures 15 to 19 As shown, the display panel and its driving method, display device provided in Embodiment 2 of the present invention are similar to those in Embodiment 1. Figures 4 to 14 The display panel, its driving method, and the display device are basically the same as those in the previous embodiment, except that in this embodiment:

[0076] The display panel 100 comprises three layers: a red display panel 100r, a green display panel 100g, and a blue display panel 100b, which are stacked on top of each other. In their reflective state, the red, green, and blue display panels 100r, 100g, and 100b reflect red, green, and blue light, respectively. The pixel units of the red, green, and blue display panels 100r, 100g, and 100b are aligned, enabling the display device to achieve full-color image display. When displaying a full-color image, each pixel unit is used to display only one color, such as red, green, or blue, but each pixel unit can display one of these colors—red, green, or blue—according to the needs of the displayed image. The red display panel 100r, green display panel 100g, and blue display panel 100b have basically the same structure, except that the cholesteric liquid crystal molecules used in the cholesteric liquid crystal layer 30 are different (for example, the pitch of the cholesteric liquid crystal molecules in each display panel is different). The red display panel 100r uses a red cholesteric liquid crystal layer 30r that can reflect red light in the reflective state, the green display panel 100g uses a green cholesteric liquid crystal layer 30g that can reflect green light in the reflective state, and the blue display panel 100b uses a blue cholesteric liquid crystal layer 30b that can reflect blue light in the reflective state. The red display panel 100r, green display panel 100g, and blue display panel 100b are stacked sequentially with the side furthest from the external environment. That is, the red display panel 100r is located on the side of the display device closest to the external environment, the green display panel 100g is located between the red display panel 100r and the blue display panel 100b, and the blue display panel 100b is located on the side of the display device furthest from the external environment.

[0077] Furthermore, the display device is provided with a light-absorbing layer 400 that is disposed on the entire surface of the display panel 100 away from the external environment, that is, the light-absorbing layer 400 is disposed on the side of the blue display panel 100b away from the red display panel 100r.

[0078] like Figure 15As shown, when displaying a red image, for the red display panel 100r, a first driving voltage (e.g., +15V) is applied to the first pixel electrode 14 and a second driving voltage (e.g., -15V) is applied to the second pixel electrode 24. The first driving voltage and the second driving voltage have opposite polarities at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then, the first driving voltage and the second driving voltage quickly become the same voltage (e.g., both are 0V), that is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V) and then quickly decrease to 0V. Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24. Then, the vertical electric field disappears rapidly, causing the cholesterol liquid crystal molecules in the red cholesterol liquid crystal layer 30r to rotate and stagnate in the P state, which is a reflective state and reflects red light. For the green display panel 100g and the blue display panel 100b, the first pixel electrode 14 in both the green display panel 100g and the blue display panel 100b are both subject to a first driving voltage (e.g., +15V), and the second pixel electrode 24 is subject to a second driving voltage (e.g., -15V). The first driving voltage and the second driving voltage have opposite polarities at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then, the first driving voltage and the second driving voltage slowly become the same voltage (e.g., both are 0V). That is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V), and then slowly decrease to 0V. Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24, and then the vertical electric field slowly disappears, causing the cholesterol liquid crystal molecules in the green cholesterol liquid crystal layer 30g and the blue cholesterol liquid crystal layer 30b to rotate and remain in the FC state, that is, the light-transmitting state.

[0079] like Figure 16As shown, when displaying a green image, for the green display panel 100g, a first driving voltage (e.g. +15V) is applied to the first pixel electrode 14 in the green display panel 100g, and a second driving voltage (e.g. -15V) is applied to the second pixel electrode 24. The first driving voltage and the second driving voltage have opposite polarities at the same time, and there is a voltage difference (e.g. 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then, the first driving voltage and the second driving voltage quickly become the same voltage (e.g., both are 0V), that is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g. 30V), and then quickly decrease to 0V. Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24. Then, the vertical electric field disappears rapidly, causing the cholesterol liquid crystal molecules in the green cholesterol liquid crystal layer 30g to rotate and stagnate in the P state, i.e., the reflective state, and reflect green light. For the red display panel 100r and the blue display panel 100b, the first pixel electrode 14 in both the red display panel 100r and the blue display panel 100b are both subject to a first driving voltage (e.g., +15V), and the second pixel electrode 24 is subject to a second driving voltage (e.g., -15V). The first driving voltage and the second driving voltage have opposite polarities at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then, the first driving voltage and the second driving voltage slowly become the same voltage (e.g., both are 0V). That is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V), and then slowly decrease to 0V. Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24, and then the vertical electric field slowly disappears, causing the cholesterol liquid crystal molecules in the red cholesterol liquid crystal layer 30r and the blue cholesterol liquid crystal layer 30b to rotate and remain in the FC state, that is, the light-transmitting state.

[0080] like Figure 17As shown, when displaying a blue image, for the blue display panel 100b, a first driving voltage (e.g., +15V) is applied to the first pixel electrode 14 and a second driving voltage (e.g., -15V) is applied to the second pixel electrode 24. The first driving voltage and the second driving voltage have opposite polarities at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then, the first driving voltage and the second driving voltage quickly become the same voltage (e.g., both are 0V), that is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V) and then quickly decrease to 0V. Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24, and then the vertical electric field disappears rapidly, causing the cholesterol liquid crystal molecules in the blue cholesterol liquid crystal layer 30b to rotate and stagnate in the P state, i.e., the reflective state, and reflect blue light. For the green display panel 100g and the red display panel 100r, the first pixel electrode 14 in both the green display panel 100g and the red display panel 100r are both subject to a first driving voltage (e.g., +15V), and the second pixel electrode 24 is subject to a second driving voltage (e.g., -15V). The first driving voltage and the second driving voltage have opposite polarities at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then the first driving voltage and the second driving voltage slowly become the same voltage (e.g., both are 0V), that is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V), and then slowly decrease to 0V. Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24, and then the vertical electric field slowly disappears, causing the cholesterol liquid crystal molecules in the green cholesterol liquid crystal layer 30g and the red cholesterol liquid crystal layer 30r to rotate and remain in the FC state, that is, the light-transmitting state.

[0081] like Figure 18As shown, when displaying a white screen, for the red pixel area, the first pixel electrode 14 corresponding to the red pixel area in the red display panel 100r is given a first driving voltage (e.g., +15V), and the second pixel electrode 24 is given a second driving voltage (e.g., -15V). The first driving voltage and the second driving voltage have opposite polarities at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then the first driving voltage and the second driving voltage quickly become the same voltage (e.g., both are 0V). That is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V), and then quickly decrease to 0V. Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24, and then the vertical electric field disappears rapidly, causing the cholesterol liquid crystal molecules in the red cholesterol liquid crystal layer 30r corresponding to the red pixel area to rotate and stagnate in the P state, i.e., the reflective state, and reflect red light; while the first pixel electrode 14 corresponding to the red pixel area in the green display panel 100g and the blue display panel 100b are both subject to a first driving voltage (e.g. +15V), and the second pixel electrode 24 are both subject to a second driving voltage (e.g. -15V). The polarities of the first driving voltage and the second driving voltage are opposite at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then the first driving voltage and the second driving voltage slowly become the same voltage (e.g., both are 0V), that is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V), and then slowly decrease to 0V. Therefore, a strong vertical electric field is initially formed between the first pixel electrode 14 and the second pixel electrode 24. This vertical electric field then slowly disappears, causing the cholesterol liquid crystal molecules in the green cholesterol liquid crystal layer 30g and the blue cholesterol liquid crystal layer 30b corresponding to the red pixel region to rotate and remain stationary in the FC state, i.e., the light-transmitting state. For the green pixel region, a first driving voltage (e.g., +15V) is applied to the first pixel electrode 14 corresponding to the green pixel region in the green display panel 100g, and a second driving voltage (e.g., -15V) is applied to the second pixel electrode 24. The first and second driving voltages have opposite polarities at the same time, resulting in a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then, the first and second driving voltages quickly become the same voltage (e.g., both 0V), meaning that the first pixel electrode 14 and the second pixel electrode 24 initially have a large voltage difference (e.g., 30V), and then rapidly decrease to 0V.Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24, and then the vertical electric field disappears rapidly, causing the cholesterol liquid crystal molecules in the green cholesterol liquid crystal layer 30g corresponding to the green pixel area to rotate and stagnate in the P state, i.e., the reflective state, and reflect green light; the first pixel electrode 14 corresponding to the green pixel area in the red display panel 100r and the blue display panel 100b are both subject to a first driving voltage (e.g., +15V), and the second pixel electrode 24 is subject to a second driving voltage (e.g., -15V). The polarities of the first driving voltage and the second driving voltage are opposite at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then the first driving voltage and the second driving voltage slowly become the same voltage (e.g., both are 0V), that is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V), and then slowly decrease to 0V. Therefore, a strong vertical electric field is initially formed between the first pixel electrode 14 and the second pixel electrode 24. This vertical electric field then slowly disappears, causing the cholesterol liquid crystal molecules in the red cholesterol liquid crystal layer 30r and the blue cholesterol liquid crystal layer 30b corresponding to the green pixel region to rotate and remain stationary in the FC state, i.e., the light-transmitting state. For the blue pixel region, a first driving voltage (e.g., +15V) is applied to the first pixel electrode 14 corresponding to the blue pixel region in the blue display panel 100b, and a second driving voltage (e.g., -15V) is applied to the second pixel electrode 24. The first and second driving voltages have opposite polarities at the same time, resulting in a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then, the first and second driving voltages quickly become the same voltage (e.g., both 0V), meaning that the first pixel electrode 14 and the second pixel electrode 24 initially have a large voltage difference (e.g., 30V), and then rapidly decrease to 0V. Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24, and then the vertical electric field disappears rapidly, causing the cholesterol liquid crystal molecules in the blue cholesterol liquid crystal layer 30b corresponding to the blue pixel area to rotate and stagnate in the P state, i.e., the reflective state, and reflect blue light; the first pixel electrode 14 corresponding to the blue pixel area in the green display panel 100g and the red display panel 100r are both subject to a first driving voltage (e.g., +15V), and the second pixel electrode 24 is subject to a second driving voltage (e.g., -15V). The polarities of the first driving voltage and the second driving voltage are opposite at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then the first driving voltage and the second driving voltage slowly become the same voltage (e.g., both are 0V), that is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V), and then slowly decrease to 0V.Therefore, a strong vertical electric field is initially formed between the first pixel electrode 14 and the second pixel electrode 24. This vertical electric field then slowly disappears, causing the cholesterol liquid crystal molecules in the corresponding blue pixel regions of the green cholesterol liquid crystal layer 30g and the red cholesterol liquid crystal layer 30r to rotate and remain stationary in the FC state, i.e., the light-transmitting state. The red light reflected from the red pixel region, the green light reflected from the green pixel region, and the blue light reflected from the blue pixel region mix to form white light.

[0082] like Figure 19 As shown, when displaying a black screen, the first pixel electrode 14 in the red display panel 100r, the green display panel 100g, and the blue display panel 100b are all subject to a first driving voltage (e.g., +15V), and the second pixel electrode 24 are all subject to a second driving voltage (e.g., -15V). The first driving voltage and the second driving voltage have opposite polarities at the same time, and there is a voltage difference (e.g., 30V) between the first pixel electrode 14 and the second pixel electrode 24. Then, the first driving voltage and the second driving voltage slowly become the same voltage (e.g., both are 0V). That is, the first pixel electrode 14 and the second pixel electrode 24 first have a large voltage difference (e.g., 30V), and then slowly decrease to 0V. Therefore, a strong vertical electric field is first formed between the first pixel electrode 14 and the second pixel electrode 24. Then the vertical electric field slowly disappears, causing the cholesterol liquid crystal molecules in the red cholesterol liquid crystal layer 30r, the green cholesterol liquid crystal layer 30g, and the blue cholesterol liquid crystal layer 30b to rotate and remain in the FC state, that is, the light-transmitting state. After the light passes through the red display panel 100r, the green display panel 100g, and the blue display panel 100b, it is absorbed by the light-absorbing layer 400 to present a black state.

[0083] When a color image is required, it is only necessary to control the grayscale voltage applied to the first pixel electrode 14 and the second pixel electrode 24 of the red display panel 100r, green display panel 100g, and blue display panel 100b to control the reflectivity of the red cholesteric liquid crystal layer 30r, green cholesteric liquid crystal layer 30g, and blue cholesteric liquid crystal layer 30b. Then, based on the principle of mixing the three primary colors of light, a full-color image is displayed. When displaying a full-color image, each pixel unit is used to display only one color, such as red, green, or blue, but each pixel unit can display one of the colors red, green, and blue according to the needs of the displayed image.

[0084] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

[0085] In this document, the directional terms such as up, down, left, right, front, and back are defined according to the position of the structures in the accompanying drawings and the relative positions of the structures, and are only used for clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second," etc., used herein are only used for distinction in name and are not used to limit the number or order.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content without departing from the scope of the technical solution of the present invention, which are equivalent embodiments with equivalent changes. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A display panel, characterized in that, The array includes a first array substrate (10), a second array substrate (20) disposed opposite to the first array substrate (10), and a cholesteric liquid crystal layer (30) located between the first array substrate (10) and the second array substrate (20). The first array substrate (10) is provided with first pixel electrodes (14) arranged in an array, and the second array substrate (20) is provided with second pixel electrodes (24) arranged in an array. The projections of the first pixel electrodes (14) onto the second array substrate (20) correspond one-to-one with the second pixel electrodes (24). The first array substrate (10) has a first bonding area (101), and the second array substrate (20) has a second bonding area (201). The first bonding area (101) and the second bonding area (201) are located on opposite sides of the display panel (100). The driving lines of the first array substrate (10) are driven sequentially from the end near the first bonding area (101) to the end away from the first bonding area (101), and the driving lines of the second array substrate (20) are driven sequentially from the end away from the second bonding area (201) to the end near the second bonding area (201), so that the first array substrate (10) and the second array substrate (20) can be controlled to refresh synchronously at the same time. When a voltage of opposite polarity is continuously applied between the first pixel electrode (14) of the first array substrate (10) and the second pixel electrode (24) of the second array substrate (20), a continuous vertical electric field is formed between the first array substrate (10) and the second array substrate (20), causing the cholesteric liquid crystal layer (30) to be in a transparent state; when the first pixel electrode (14) of the first array substrate (10) and the second pixel electrode (24) of the second array substrate (20) are synchronously switched to the same voltage, the vertical electric field is removed, and the cholesteric liquid crystal layer (30) is driven to switch between a reflective state and a scattering state by controlling the removal speed of the vertical electric field.

2. The display panel according to claim 1, characterized in that, The first array substrate (10) is formed by multiple first scan lines (111) and multiple first data lines (131) that are mutually insulated and intersecting to form a plurality of first pixel units (P1). Each first pixel unit (P1) is provided with a first pixel electrode (14) and a first thin film transistor (102). The first pixel electrode (14) is electrically connected to the corresponding first scan line (111) and first data line (131) through the first thin film transistor (102). The second array substrate (20) is formed by multiple second scan lines (211) and multiple second data lines (231) that are mutually insulated and intersecting to form a plurality of second pixel units (P2). Each second pixel unit (P2) is provided with a second pixel electrode (24) and a second thin film transistor (202). The second pixel electrode (24) is electrically connected to the corresponding second scan line (211) and second data line (231) through the second thin film transistor (202). The projection of the first pixel unit (P1) on the second array substrate (20) corresponds one-to-one with the second pixel unit (P2), the projection of the first scan line (111) on the second array substrate (20) corresponds one-to-one with the second scan line (211), the projection of the first data line (131) on the second array substrate (20) corresponds one-to-one with the second data line (231), and the projection of the first thin film transistor (102) on the second array substrate (20) corresponds one-to-one with the second thin film transistor (202).

3. The display panel according to any one of claims 1-2, characterized in that, The display panel (100) includes a driver chip and a signal distributor. The driver chip is electrically connected to the signal distributor and is used to input a drive signal to the signal distributor. The drive lines on the first array substrate (10) and the second array substrate (20) are all electrically connected to the same signal distributor. The signal distributor is used to distribute the drive signal to the drive lines on the first array substrate (10) and the second array substrate (20) simultaneously.

4. The display panel according to claim 3, characterized in that, The driving chip includes a data driving chip (210) and a scan driving chip (310), and the signal distributor includes a data signal distributor (220) and a scan signal distributor (320). The data driving chip (210) is electrically connected to the data signal distributor (220) and is used to input data driving signals to the data signal distributor (220). The data driving lines on the first array substrate (10) and the second array substrate (20) are all electrically connected to the same data signal distributor (220). The data signal distributor (220) is used to simultaneously distribute the data driving signals to the data driving chips. The data driving lines on the first array substrate (10) and the second array substrate (20); the scan driving chip (310) is electrically connected to the scan signal distributor (320) and is used to input scan driving signals to the scan signal distributor (320). The scan driving lines on the first array substrate (10) and the second array substrate (20) are all electrically connected to the same scan signal distributor (320). The scan signal distributor (320) is used to distribute the scan driving signals to the scan driving lines on the first array substrate (10) and the second array substrate (20) at the same time.

5. A display device, characterized in that, Includes the display panel (100) as described in any one of claims 1-4.

6. The display device according to claim 5, characterized in that, The number of display panels (100) is three, namely a red display panel (100r), a green display panel (100g), and a blue display panel (100b) stacked on top of each other. The red display panel (100r), the green display panel (100g), and the blue display panel (100b) reflect red light, green light, and blue light respectively in the reflective state. The pixel units of the red display panel (100r), the green display panel (100g), and the blue display panel (100b) are aligned with each other. And / or, the display device is provided with a light-absorbing layer (400) that is disposed on the side of the display panel (100) away from the external environment.

7. A driving method for a display panel, characterized in that, The driving method for driving the display panel (100) as described in any one of claims 1-4 includes: A first driving voltage is applied to the first pixel electrode (14), and a second driving voltage is applied to the second pixel electrode (24) corresponding to the first pixel electrode (14). When voltages of opposite polarity are continuously applied between the first pixel electrode (14) of the first array substrate (10) and the second pixel electrode (24) of the second array substrate (20), a continuous vertical electric field is formed between the first array substrate (10) and the second array substrate (20), causing the cholesterol liquid crystal layer (30) to be in a transparent state. When the first pixel electrode (14) of the first array substrate (10) and the second pixel electrode (24) of the second array substrate (20) are synchronously switched to the same voltage, the vertical electric field is removed, and the cholesterol liquid crystal layer (30) is driven to switch between a reflective state and a scattering state by controlling the removal speed of the vertical electric field.

8. The driving method for a display panel according to claim 7, characterized in that, The first array substrate (10) is provided with a plurality of first scan lines (111) and a plurality of first data lines (131), and the second array substrate (20) is provided with a plurality of second scan lines (211) and a plurality of second data lines (231). The projection of the first scan line (111) on the second array substrate (20) corresponds one-to-one with the second scan line (211), and the projection of the first data line (131) on the second array substrate (20) corresponds one-to-one with the second data line (231). The driving method includes: The first scan line (111) and the second scan line (211) corresponding to the first scan line (111) are scanned synchronously. At the same time, the first data line (131) and the second data line (231) corresponding to the first data line (131) are respectively subjected to the first driving voltage and the second driving voltage.

9. The driving method for a display panel according to claim 7, characterized in that, The display panel (100) includes a driver chip and a signal distributor. The driver chip is electrically connected to the signal distributor and is used to input a drive signal to the signal distributor. The drive lines on the first array substrate (10) and the second array substrate (20) are all electrically connected to the same signal distributor. The signal distributor is used to distribute the drive signal to the drive lines on the first array substrate (10) and the second array substrate (20). The driving method includes: The signal distributor is controlled to simultaneously distribute the corresponding drive signals to the drive lines on the first array substrate (10) and the second array substrate (20).

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