Display panel, display device and driving method

Abstract

The application discloses a display panel, a display device and a driving method. The display panel comprises a display box and a light-adjusting box stacked on the upper side of the display box, and has a static pattern display area and a static pattern background area. The light-adjusting box comprises a first substrate, a second substrate and a cholesteric liquid crystal layer arranged between the first substrate and the second substrate. The first substrate is provided with a common viewing angle electrode. The second substrate is provided with a first viewing angle electrode and a second viewing angle electrode matched with the common viewing angle electrode. The first viewing angle electrode and the second viewing angle electrode are insulated and spaced from each other. The pattern of the second viewing angle electrode corresponds to the static pattern display area. The cholesteric liquid crystal layer is switched between a transparent state and a fog state to realize wide and narrow viewing angle switching. The cholesteric liquid crystal layer also has a reflection state. When displaying a static pattern, ambient light is reflected to realize static pattern display. The fog state and the reflection state do not need to be maintained by an electric field, so that the power consumption of the static pattern display is reduced.

Description

Technical Field

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

[0002] With the continuous advancement of LCD technology, the viewing angle of monitors has expanded from around 120° to over 160°. While enjoying the visual experience brought by a wider viewing angle, people also want to effectively protect trade secrets and personal privacy to avoid business losses or embarrassment caused by the leakage of screen information. Therefore, in addition to the need for a wide viewing angle, many situations also require display devices to have the function of switching between wide and narrow viewing angles.

[0003] Currently, the main method used is to attach a Venetian blind film to the display screen to achieve the switching between wide and narrow viewing angles. When privacy is required, the screen can be covered with the Venetian blind film to narrow the viewing angle. However, this method requires an extra Venetian blind film, which causes great inconvenience to the user. Moreover, a Venetian blind film can only achieve one viewing angle. Once the Venetian blind film is attached, the viewing angle is fixed in the narrow viewing angle mode, making it impossible to switch freely between the wide and narrow viewing angle modes. In addition, the privacy film will reduce the brightness and affect the aesthetics.

[0004] Moreover, existing displays require the backlight to be turned on and electrical signals to be applied to the gate drive circuit when displaying static patterns, resulting in high power consumption. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the prior art, the present invention aims to provide a display panel, display device and driving method to solve the problem that the prior art cannot achieve both wide and narrow viewing angle switching function and reduce power consumption when displaying static patterns.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] This invention provides a display panel, which includes a display box and a dimming box stacked on top of the display box. The display panel has a static pattern display area and a static pattern background area.

[0008] The dimming box includes a first substrate, a second substrate disposed opposite to the first substrate, and a cholesteric liquid crystal layer disposed between the first substrate and the second substrate. A common viewing angle electrode is provided on the side of the first substrate facing the cholesteric liquid crystal layer. A first viewing angle electrode and a second viewing angle electrode cooperating with the common viewing angle electrode are provided on the side of the second substrate facing the cholesteric liquid crystal layer. The first viewing angle electrode and the second viewing angle electrode are insulated from each other and spaced apart. The pattern of the second viewing angle electrode corresponds to the static pattern display area.

[0009] In wide viewing angle mode, when the display cell is turned on, all cholesteric liquid crystal layers are in a foggy state and have a light-diffusing effect; in narrow viewing angle mode, when the display cell is turned on, all cholesteric liquid crystal layers are in a transparent state; in static pattern display mode, when the display cell is turned off, the cholesteric liquid crystal layer corresponding to the static pattern display area is in one of a foggy state and a reflective state, and the cholesteric liquid crystal layer corresponding to the static pattern background area is in the other of a foggy state and a reflective state.

[0010] Furthermore, the first viewing angle electrode and the second viewing angle electrode are located in different layers, and the first viewing angle electrode is a planar electrode that covers the entire surface of the second substrate.

[0011] Furthermore, the pattern of the first viewing angle electrode corresponds to the static pattern background area.

[0012] Furthermore, the first viewing angle electrode and the second viewing angle electrode are located on different layers, and in the projection direction of the second substrate, the edge of the first viewing angle electrode near the second viewing angle electrode and the edge of the second viewing angle electrode near the first viewing angle electrode have a partial overlap area.

[0013] The width of the partially overlapping region is greater than 2 μm.

[0014] Furthermore, the display panel has a black matrix, and the projection area of ​​the partially overlapping area on the second substrate is located within the projection area of ​​the black matrix on the second substrate.

[0015] Furthermore, the edge of the projection area of ​​the partially overlapping region on the second substrate and the edge of the projection area of ​​the black matrix on the second substrate are spaced apart, and the space is greater than 1 μm.

[0016] Furthermore, the first viewing angle electrode and the second viewing angle electrode are located on the same layer and spaced apart from each other.

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

[0018] This application also provides a driving method for a display panel, used to drive the display panel as described above, the driving method comprising:

[0019] In narrow viewing angle mode, the display cell is turned on, a common voltage signal is applied to the common viewing angle electrode, and a first electrical signal is applied to both the first and second viewing angle electrodes. The voltage difference between the common voltage signal and the first electrical signal is between a first preset value and a second preset value, and all the cholesteric liquid crystal layers are in a transparent state.

[0020] In wide viewing angle mode, the display cell is turned on, the common voltage signal is applied to the common viewing angle electrode, and a second electrical signal is applied to both the first viewing angle electrode and the second viewing angle electrode. The voltage difference between the second electrical signal and the common voltage signal is between the first preset value and the second preset value, and the second electrical signal gradually becomes the same as the common voltage signal within a first preset time. All the cholesteric liquid crystal layers are in a hazy state and have a light-scattering effect.

[0021] In static pattern display mode, the display cell is turned off, a common voltage signal is applied to the common viewing angle electrode, a second electrical signal is applied to the first viewing angle electrode, and a third electrical signal is applied to the second viewing angle electrode. The voltage difference between the third electrical signal and the common voltage signal is between the first preset value and the second preset value, and the third electrical signal directly becomes the same as the common voltage signal at a second preset time. The second preset time is less than the first preset time. The cholesteric liquid crystal layer corresponding to the static pattern background area is in a fog state, and the cholesteric liquid crystal layer corresponding to the static pattern display area is in a reflective state. Alternatively, the third electrical signal is applied to the first viewing angle electrode, and the second electrical signal is applied to the second viewing angle electrode. The cholesteric liquid crystal layer corresponding to the static pattern background area is in a reflective state, and the cholesteric liquid crystal layer corresponding to the static pattern display area is in a fog state.

[0022] Furthermore, the first preset value is 25V, the second preset value is 30V, and the first preset time is 0.2 to 1 second.

[0023] The beneficial effects of this invention are as follows: by using a cholesteric liquid crystal layer in the dimming box, the cholesteric liquid crystal layer can switch between a transparent state and a fog state, thereby achieving wide and narrow viewing angle switching; in addition, the cholesteric liquid crystal layer also has a reflective state. In the static pattern display mode, one of the static pattern display area and the static pattern background area is in a fog state and the other is in a reflective state, thereby using reflected ambient light to achieve static pattern display. Moreover, the fog state and the reflective state do not require an electric field to maintain, thereby reducing the power consumption of displaying static patterns. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the display panel in its initial state according to Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the planar structure of the display panel in Embodiment 1 of the present invention;

[0026] Figure 3 This is a schematic diagram of the planar structure of the second substrate in Embodiment 1 of the present invention;

[0027] Figure 4This is a signal waveform diagram of the display panel in narrow viewing angle mode according to Embodiment 1 of the present invention;

[0028] Figure 5 This is a schematic diagram of the display panel in narrow viewing angle mode according to Embodiment 1 of the present invention;

[0029] Figure 6 This is a signal waveform diagram of the display panel in wide viewing angle mode according to Embodiment 1 of the present invention;

[0030] Figure 7 This is a schematic diagram of the display panel in wide viewing angle mode according to Embodiment 1 of the present invention;

[0031] Figure 8 This is a signal waveform diagram of the display panel in static pattern display mode according to Embodiment 1 of the present invention;

[0032] Figure 9 This is one of the structural schematic diagrams of the display panel in static pattern display mode in Embodiment 1 of the present invention;

[0033] Figure 10 This is one of the planar structural schematic diagrams of the display panel in static pattern display mode according to Embodiment 1 of the present invention;

[0034] Figure 11 This is the second schematic diagram of the display panel in static pattern display mode in Embodiment 1 of the present invention;

[0035] Figure 12 This is the second schematic diagram of the planar structure of the display panel in static pattern display mode in Embodiment 1 of the present invention;

[0036] Figure 13 This is a schematic diagram of the display panel in its initial state according to Embodiment 2 of the present invention;

[0037] Figure 14 This is a partially enlarged structural diagram of the display panel in Embodiment 2 of the present invention;

[0038] Figure 15 This is a schematic diagram of the display panel in its initial state according to Embodiment 3 of the present invention;

[0039] Figure 16 This is one of the schematic diagrams of the planar structure of the display device in this invention;

[0040] Figure 17 This is the second schematic diagram of the planar structure of the display device in this invention. Detailed Implementation

[0041] 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, display device, and driving method proposed according to the present invention:

[0042] [Example 1]

[0043] Figure 1 This is a schematic diagram of the display panel in its initial state according to Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the planar structure of the display panel in Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the planar structure of the second substrate in Embodiment 1 of the present invention.

[0044] like Figures 1 to 3 As shown in Embodiment 1 of the present invention, a display panel has a graphical static pattern display area 120 and a static pattern background area 110. The other areas of the display panel besides the static pattern display area 120 are the static pattern background area 110. The graphic in the static pattern display area 120 can be set according to the actual pattern to be displayed; it can be a logo pattern or other patterns (in this embodiment, the letter "V" is used as the pattern to be displayed in the static pattern display area 120). The display panel includes a dimming box 10 and a display box 20 stacked on top of each other. The dimming box 10 is located above the display box 20, i.e., the dimming box 10 is located on the light-emitting side of the display box 20. The dimming box 10 is used to control the viewing angle of the display panel and the display of the static pattern, while the display box 20 is used to control the display panel to display a normal image.

[0045] The dimming box 10 includes a first substrate 11, a second substrate 12 disposed opposite to the first substrate 11, and a cholesteric liquid crystal layer 13 disposed between the first substrate 11 and the second substrate 12. The cholesteric liquid crystal layer 13 can switch between a hazy state, a transparent state, and a reflective state. A common viewing angle electrode 111 is provided on the side of the first substrate 11 facing the cholesteric liquid crystal layer 13. A first viewing angle electrode 121 and a second viewing angle electrode 122, cooperating with the common viewing angle electrode 111, are provided on the side of the second substrate 12 facing the cholesteric liquid crystal layer 13. The first viewing angle electrode 121 and the second viewing angle electrode 122 are insulated from each other and spaced apart. The pattern of the second viewing angle electrode 122 corresponds to the static pattern display area 120. Figure 2 and Figure 3 The states of the static pattern display area 120 and the static pattern background area 110 are controlled by controlling the pressure difference between the common viewing angle electrode 111 and the first viewing angle electrode 121 and the pressure difference between the common viewing angle electrode 111 and the second viewing angle electrode 122, thereby realizing the control of wide and narrow viewing angle switching and static pattern display.

[0046] The cholesteric liquid crystal in the cholesteric liquid crystal layer 13 possesses three stable textures: P-state (Planar, reflective state), FC-state (Focal Conic, hazy state), and H-state (transparent state). 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.

[0047] Initially, when the cholesteric liquid crystal is set to the P state, it is in a reflective state. Different orientations of the cholesteric liquid crystal result in different reflected visible light spectra, with the remaining spectrum transmitted. The reflective spectral band (Δλ) of the cholesteric liquid crystal is proportional to its pitch (Po) and birefringence (Δn = ne - no), with the formula: Δλ = PoΔn. Therefore, cholesteric liquid crystals with different pitches can reflect different colors of light in the reflective state. Alternatively, the cholesteric liquid crystal can be initially set to the FC state. In both the P and FC states, no voltage is required to maintain them. When a voltage is applied across the terminals and then slowly reduced to zero, the cholesteric liquid crystal rotates and remains in the FC state, which is a scattering state. When the applied voltage is maintained across the terminals, the cholesteric liquid crystal rotates and remains in the H state, which is a transparent state. When a voltage is applied across the terminals and then rapidly reduced to zero, the cholesteric liquid crystal rotates and remains in the P state, which is a reflective state.

[0048] In this embodiment, the first viewing angle electrode 121 and the second viewing angle electrode 122 are located on different layers. The second viewing angle electrode 122 is located above the first viewing angle electrode 121. The first viewing angle electrode 121 is a planar electrode that covers the entire surface of the second substrate 12. The common viewing angle electrode 111 is a planar electrode that covers the entire surface of the first substrate 11, thereby reducing two etching processes and simplifying the manufacturing process.

[0049] In this embodiment, as Figure 2 As shown, the static pattern display area 120 is located in the center of the display panel, and the other areas of the display panel excluding the static pattern display area 120 are the static pattern background area 110. Of course, the position of the static pattern display area 120 can also be set according to the position where the pattern needs to be displayed.

[0050] In this embodiment, the display cell 20 is preferably a liquid crystal cell. Of course, in other embodiments, the display cell 20 may also be a self-emissive display (e.g., an OLED display, a Micro LED display).

[0051] The display cell 20 includes a color filter substrate 21, an array substrate 22 disposed opposite to the color filter substrate 21, and a liquid crystal layer 23 disposed between the color filter substrate 21 and the array substrate 22. The liquid crystal layer 23 preferably uses positive liquid crystal molecules, i.e., liquid crystal molecules with positive dielectric anisotropy. Initially, the positive liquid crystal molecules in the liquid crystal layer 23 are aligned parallel to the color filter substrate 21 and the array substrate 22, with the alignment direction of the positive liquid crystal molecules closer to the color filter substrate 21 being parallel or antiparallel to the alignment direction of the positive liquid crystal molecules closer to the array substrate 22. Of course, in other embodiments, the liquid crystal layer 23 may also use negative liquid crystal molecules, and the negative liquid crystal molecules in the liquid crystal layer 23 may be aligned perpendicular to the color filter substrate 21 and the array substrate 22, i.e., similar to the alignment method of the VA display mode.

[0052] Furthermore, a first polarizer 31 is provided between the dimming box 10 and the display box 20, and a second polarizer 32 is provided on the side of the display box 20 away from the dimming box 10, with the light transmission axis of the second polarizer 32 being perpendicular to the light transmission axis of the first polarizer 31.

[0053] The color filter substrate 21 has an array of color resist layers 212 and black matrices 211 separating the color resist layers 212. The color resist layers 212 include red (R), green (G), and blue (B) color resist materials, and correspondingly form red (R), green (G), and blue (B) sub-pixels. The black matrices 211 are strip-shaped, with black matrices 211 extending laterally and covering scan lines and black matrices 211 extending vertically and covering data lines. The edge of the second viewing angle electrode 122 can be located within the black matrices 211, that is, the edge of the second viewing angle electrode 122 is blocked by the black matrices 211, thereby blocking the problem of unclear edge images caused by the irregular arrangement of cholesteric liquid crystal at the electrode edge.

[0054] The array substrate 22, facing the liquid crystal layer 23, is defined by multiple scan lines (not shown) and multiple data lines (not shown) that are mutually insulated and intersecting to form multiple pixel units. Each pixel unit is provided with a pixel electrode 222 and a thin-film transistor (not shown). The pixel electrode 222 is electrically connected to the data line of the adjacent thin-film transistor through the thin-film transistor. The thin-film transistor includes a gate, an active layer, a drain, and a source. The gate and the scan lines are located on the same layer and are electrically connected. The gate and the active layer are isolated by an insulating layer. The source is electrically connected to the data line, and the drain is electrically connected to the pixel electrode 222 through a contact hole.

[0055] like Figure 1 As shown, in this embodiment, a common electrode 221 is also provided on the side of the array substrate 22 facing the liquid crystal layer 23. The common electrode 221 and the pixel electrode 222 are located on different layers and are insulated from each other by an insulating layer. The common electrode 221 can be located above or below the pixel electrode 222. Figure 1The diagram shows the common electrode 221 located below the pixel electrode 222. Preferably, the common electrode 221 is a planar electrode with its entire surface, and the pixel electrode 222 is a slit electrode with multiple electrode strips in each pixel unit to form a fringe field switching (FFS) mode. Of course, in other embodiments, the pixel electrode 222 and the common electrode 221 may be located on the same layer, but they are insulated from each other. Both the pixel electrode 222 and the common electrode 221 may include multiple electrode strips, and the electrode strips of the pixel electrode 222 and the common electrode 221 are arranged alternately to form an in-plane switching (IPS) mode; or, in other embodiments, the array substrate 22 has the pixel electrode 222 on the side facing the liquid crystal layer 23, and the color filter substrate 21 has the common electrode 221 on the side facing the liquid crystal layer 23 to form a TN mode or a VA mode.

[0056] The first substrate 11, the second substrate 12, the color filter substrate 21, and the array substrate 22 can be made of materials such as glass, acrylic, and polycarbonate. The common viewing angle electrode 111, the first viewing angle electrode 121, the second viewing angle electrode 122, the common electrode 221, and the pixel electrode 222 can be made of materials such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0057] The present invention also provides a display device, including a display panel as described above and a backlight module 40, wherein the backlight module 40 is located below the display panel and is used to provide a backlight source for the display panel. Of course, if the display box 20 is a self-emissive display, then no additional backlight source is required.

[0058] The backlight module 40 includes a backlight source 41 and a privacy layer 43, which reduces the range of light emission angles. A brightness enhancement film 42 is also provided between the backlight source 41 and the privacy layer 43, increasing the brightness of the backlight module 40. The privacy layer 43 acts like a miniature venetian blind, blocking light with a large incident angle while allowing light with a smaller incident angle to pass through, thus reducing the range of light angles passing through the privacy layer 43. The privacy layer 43 includes multiple parallel light-blocking walls and light-transmitting holes located between adjacent light-blocking walls. Light-absorbing material is provided on both sides of the light-blocking walls. Alternatively, the backlight source 41 can be a light-collecting backlight source, eliminating the need for a privacy layer 43; however, light-collecting backlight sources are more expensive than conventional backlight sources. The backlight module 40 can be a side-lit backlight module or a direct-lit backlight module. Preferably, the backlight module 40 adopts a collimated backlight (CBL) mode, which can collect light and ensure display effect.

[0059] This application also provides a driving method with switchable wide and narrow viewing angles, which is used to drive the display panel as described above, and the driving method includes:

[0060] Figure 4 This is a signal waveform diagram of the display panel in narrow viewing angle mode in Embodiment 1 of the present invention. Figure 5 This is a schematic diagram of the display panel in narrow viewing angle mode according to Embodiment 1 of the present invention. Figure 4 and Figure 5 As shown, in narrow viewing angle mode, the display cell 20 is turned on, and the backlight module 40 is turned on simultaneously. A common voltage signal Vcom is applied to the common viewing angle electrode 111, and a first electrical signal V1 is applied to both the first viewing angle electrode 121 and the second viewing angle electrode 122. The voltage difference between the common voltage signal Vcom and the first electrical signal V1 is between a first preset value and a second preset value. A strong vertical electric field is formed between the first substrate 11 and the second substrate 12. All cholesteric liquid crystal layers 13 rotate and remain stationary in the H state (transparent state). Light can pass directly through the cholesteric liquid crystal layers 13 without changing the angle of the light, thereby realizing narrow viewing angle display.

[0061] Figure 6 This is a signal waveform diagram of the display panel in wide viewing angle mode in Embodiment 1 of the present invention. Figure 7 This is a schematic diagram of the display panel in wide viewing angle mode according to Embodiment 1 of the present invention. Figure 6 and Figure 7 As shown, in wide viewing angle mode, the display cell 20 is turned on, and the backlight module 40 is turned on simultaneously. A common voltage signal Vcom is applied to the common viewing angle electrode 111, and a second electrical signal V2 is applied to both the first viewing angle electrode 121 and the second viewing angle electrode 122. The voltage difference between the second electrical signal V2 and the common voltage signal Vcom is between a first preset value and a second preset value, and the second electrical signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time. That is, a strong vertical electric field is first formed between the first substrate 11 and the second substrate 12, and then the vertical electric field slowly disappears, so that all cholesteric liquid crystal layers 13 are in a hazy state and have a light-scattering effect, thereby realizing wide viewing angle display.

[0062] Figure 8 This is a signal waveform diagram of the display panel in static pattern display mode in Embodiment 1 of the present invention. Figure 9 This is one of the structural schematic diagrams of the display panel in static pattern display mode in Embodiment 1 of the present invention. Figure 10 This is one of the planar structural schematic diagrams of the display panel in static pattern display mode according to Embodiment 1 of the present invention. For example... Figures 8 to 10As shown, in static pattern display mode, display cell 20 is turned off, and backlight module 40 is also turned off. A common voltage signal Vcom is applied to common viewing angle electrode 111, a second electrical signal V2 is applied to first viewing angle electrode 121, and a third electrical signal V3 is applied to second viewing angle electrode 122. The voltage difference between the third electrical signal V3 and common voltage signal Vcom is between a first preset value and a second preset value. The third electrical signal V3 directly becomes the same as common voltage signal Vcom at a second preset time. The second preset time is less than the first preset time, that is, a strong vertical electric field is first formed between the first substrate 11 and the second substrate 12, and then the vertical electric field disappears quickly, making the cholesteric liquid crystal layer 13 corresponding to the static pattern background area 110 a fog state, while the cholesteric liquid crystal layer 13 corresponding to the static pattern display area 120 is a reflective state. There is a difference in brightness between the static pattern background area 110 and the static pattern display area 120, thereby displaying the pattern corresponding to the static pattern display area 120. The color displayed by the static pattern is the same as the color reflected by the cholesteric liquid crystal layer 13.

[0063] Figure 11 This is the second structural schematic diagram of the display panel in static pattern display mode in Embodiment 1 of the present invention. Figure 12 This is the second schematic diagram of the planar structure of the display panel in static pattern display mode according to Embodiment 1 of the present invention. Figure 8 , Figure 11 as well as Figure 12 As shown, a third electrical signal V3 can also be applied to the first viewing angle electrode 121, and a second electrical signal V2 can be applied to the second viewing angle electrode 122, so that the cholesteric liquid crystal layer 13 corresponding to the static pattern background area 110 is in a reflective state, and the cholesteric liquid crystal layer 13 corresponding to the static pattern display area 120 is in a foggy state. The brightness of the static pattern background area 110 and the static pattern display area 120 also differs, thereby displaying the pattern corresponding to the static pattern display area 120. However, the color of the static pattern background area 110 is the same as the color reflected by the cholesteric liquid crystal layer 13, and the static pattern is displayed as gray.

[0064] In both narrow and wide viewing angle modes, a common voltage is applied to the common electrode 221, and a corresponding grayscale voltage is applied to the pixel electrode 222. A voltage difference is formed between the pixel electrode 222 and the common electrode 221, generating a vertical electric field. The positive liquid crystal molecules in the liquid crystal layer 23 deflect vertically. The grayscale voltage includes 0 to 255 levels. When different grayscale voltages are applied to the pixel electrode 222, the pixel unit exhibits different brightness, thus displaying different images in the narrow and wide viewing angle modes. In the static pattern display mode, since the display cell 20 is in the off state, no voltage needs to be applied to the common electrode 221 and the pixel electrode 222.

[0065] In this embodiment, the common voltage signal Vcom is a 0V DC voltage. The first preset value is 25V, the second preset value is 30V, and the first preset time is 0.2 to 1 second. That is, the first electrical signal V1, the second electrical signal V2, and the third electrical signal V3 are all 25V to 30V, except that the second electrical signal V2 slowly decreases to 0V within the first preset time, while the third electrical signal V3 quickly decreases to 0V within the second preset time. The first electrical signal V1, the second electrical signal V2, and the third electrical signal V3 are all square waves with a frequency of 50 to 60Hz.

[0066] [Example 2]

[0067] Figure 13 This is a schematic diagram of the display panel in its initial state in Embodiment 2 of the present invention. Figure 14 This is a partially enlarged structural diagram of the display panel in Embodiment 2 of the present invention. For example... Figure 13 and Figure 14 As shown, the display panel, display device, and driving method provided in Embodiment 2 of the present invention are the same as those in Embodiment 1. Figures 1 to 12 The display panel, display device, and driving method are basically the same as those in the previous embodiment, except that in this embodiment:

[0068] The pattern of the first-view electrode 121 corresponds to the static pattern background area 110, and the first-view electrode 121 and the second-view electrode 122 are located in different layers, thereby effectively reducing the opposing capacitance of the first-view electrode 121 and the second-view electrode 122, reducing charging loading and improving charging efficiency, and further saving power consumption; since the transmittance of the transparent electrode is between 88% and 92%, reducing the overlapping area of ​​the first-view electrode 121 and the second-view electrode 122 can effectively improve the transmittance.

[0069] Furthermore, in the projection direction of the second substrate 12, the edge of the first viewing angle electrode 121 near the second viewing angle electrode 122 and the edge of the second viewing angle electrode 122 near the first viewing angle electrode 121 have a partial overlap region. The width 'a' of the partial overlap region is greater than 2 μm, ensuring that the cholesteric liquid crystal layer 13 at the edge of the second viewing angle electrode 122 can also be effectively controlled.

[0070] Furthermore, the projection area of ​​the partially overlapping region on the second substrate 12 is located within the projection area of ​​the black matrix 211 on the second substrate 12, that is, the partially overlapping region is blocked by the black matrix 211, thereby improving the display effect. The edge of the projection area of ​​the partially overlapping region on the second substrate 12 and the edge of the projection area of ​​the black matrix 211 on the second substrate 12 have a distance b, which is greater than 1um.

[0071] 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.

[0072] [Example 3]

[0073] Figure 15 This is a schematic diagram of the display panel in its initial state according to Embodiment 3 of the present invention. Figure 15 As shown, the display panel, display device, and driving method provided in Embodiment 3 of the present invention are the same as those in Embodiment 1. Figures 1 to 12 The display panel, display device, and driving method are basically the same as those in the previous embodiment, except that in this embodiment:

[0074] The pattern of the first-view electrode 121 corresponds to the background area 110 of the static pattern, and the first-view electrode 121 and the second-view electrode 122 are located on the same layer and spaced apart from each other, thereby effectively avoiding the opposing capacitance of the first-view electrode 121 and the second-view electrode 122, reducing charging loading and improving charging efficiency, and further saving power consumption. Since the transmittance of the transparent electrode is between 88% and 92%, avoiding overlapping areas of the first-view electrode 121 and the second-view electrode 122 can effectively improve the transmittance. Moreover, the absence of overlapping areas between the first-view electrode 121 and the second-view electrode 122 makes the boundary of the static pattern clearer. In addition, since the first-view electrode 121 and the second-view electrode 122 are located on the same layer, they can be etched using the same layer of transparent electrodes, greatly simplifying the manufacturing process. If the static pattern has a closed pattern, a notch can be set in the closed pattern to facilitate the signal extraction of the second-view electrode 122 within the closed pattern.

[0075] 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.

[0076] Figure 16 This is one of the schematic diagrams of the planar structure of the display device in this invention. Figure 17 This is the second schematic diagram of the planar structure of the display device in this invention. Please refer to... Figure 16 and Figure 17 The display device is equipped with a display mode switching button 50, which allows the user to request a viewpoint switch from the display device. The display mode switching button 50 can be a physical button (such as...). Figure 16 As shown), it can also be used for software control or application programs (APP) to implement switching functions (such as... Figure 17As shown, for example, the viewing angle can be set via a slider. When a user needs to switch between wide viewing angle, narrow viewing angle, and static image display, they can send a mode switching request to the display device by operating the display mode switching button 50. Ultimately, the driver chip 60 controls the application of different electrical signals to the common viewing angle electrode 111, the first viewing angle electrode 121, the second viewing angle electrode 122, and the display cell 20, thus enabling the display device to switch between wide viewing angle, narrow viewing angle, and static image display. When switching to wide viewing angle, the driving method corresponding to the wide-angle mode is used; when switching to narrow viewing angle, the driving method corresponding to the narrow viewing angle mode is used; and when switching to static image display, the driving method corresponding to the static image display mode is used. Therefore, the display device of this embodiment has strong operational flexibility and convenience, achieving a multi-functional display device integrating entertainment video and privacy protection.

[0077] 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.

[0078] 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 display panel includes a display box (20) and a dimming box (10) stacked on the upper side of the display box (20). The display panel has a static pattern display area (120) and a static pattern background area (110). The dimming box (10) includes a first substrate (11), a second substrate (12) disposed opposite to the first substrate (11), and a cholesteric liquid crystal layer (13) disposed between the first substrate (11) and the second substrate (12). The first substrate (11) has a common viewing angle electrode (111) on the side facing the cholesteric liquid crystal layer (13), and the second substrate (12) has a first viewing angle electrode (121) and a second viewing angle electrode (122) cooperating with the common viewing angle electrode (111) on the side facing the cholesteric liquid crystal layer (13). The first viewing angle electrode (121) and the second viewing angle electrode (122) are insulated from each other and spaced apart. The pattern of the second viewing angle electrode (122) corresponds to the static pattern display area (120). The first viewing angle electrode (121) and the second viewing angle electrode (122) are located on different layers. The first viewing angle electrode (121) is a planar electrode that covers the entire surface of the second substrate (12). Alternatively, the first viewing angle electrode (121) and the second viewing angle electrode (122) are located on the same layer and spaced apart from each other. The pattern of the first viewing angle electrode (121) corresponds to the static pattern background area (110). In wide viewing angle mode, when the display box (20) is turned on, all the cholesteric liquid crystal layers (13) are in a fog state and have a light-diffusing effect; in narrow viewing angle mode, when the display box (20) is turned on, all the cholesteric liquid crystal layers (13) are in a transparent state; in static pattern display mode, when the display box (20) is turned off, the cholesteric liquid crystal layer (13) corresponding to the static pattern display area (120) is in one of a fog state and a reflective state, and the cholesteric liquid crystal layer (13) corresponding to the static pattern background area (110) is in the other of a fog state and a reflective state.

2. The display panel according to claim 1, characterized in that, The first viewing angle electrode (121) and the second viewing angle electrode (122) are located on different layers. In the projection direction of the second substrate (12), the edge of the first viewing angle electrode (121) near the second viewing angle electrode (122) and the edge of the second viewing angle electrode (122) near the first viewing angle electrode (121) have a partial overlap area. The width of the partially overlapping region is greater than 2 μm.

3. The display panel according to claim 2, characterized in that, The display panel has a black matrix (211), and the projection area of ​​the partially overlapping area on the second substrate (12) is located within the projection area of ​​the black matrix (211) on the second substrate (12).

4. The display panel according to claim 3, characterized in that, The edge of the projection area of ​​the partially overlapping region on the second substrate (12) and the edge of the projection area of ​​the black matrix (211) on the second substrate (12) have a distance greater than 1 μm.

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

6. A driving method for a display panel, characterized in that, The driving method for driving the display panel as described in any one of claims 1-4 includes: In narrow viewing angle mode, the display cell (20) is turned on, a common voltage signal (Vcom) is applied to the common viewing angle electrode (111), and a first electrical signal (V1) is applied to both the first viewing angle electrode (121) and the second viewing angle electrode (122). The voltage difference between the common voltage signal (Vcom) and the first electrical signal (V1) is between a first preset value and a second preset value, and all the cholesteric liquid crystal layers (13) are in a transparent state. In wide viewing angle mode, the display cell (20) is turned on, the common voltage signal (Vcom) is applied to the common viewing angle electrode (111), and a second electrical signal (V2) is applied to both the first viewing angle electrode (121) and the second viewing angle electrode (122). The voltage difference between the second electrical signal (V2) and the common voltage signal (Vcom) is between the first preset value and the second preset value, and the second electrical signal (V2) gradually becomes the same as the common voltage signal (Vcom) within a first preset time. All the cholesteric liquid crystal layers (13) are in a hazy state and have a light-scattering effect. In static pattern display mode, the display box (20) is turned off. A common voltage signal (Vcom) is applied to the common viewing angle electrode (111), a second electrical signal (V2) is applied to the first viewing angle electrode (121), and a third electrical signal (V3) is applied to the second viewing angle electrode (122). The voltage difference between the third electrical signal (V3) and the common voltage signal (Vcom) is between a first preset value and a second preset value. Furthermore, the third electrical signal (V3) directly becomes the same as the common voltage signal (Vcom) at a second preset time. If the time is less than the first preset time, the cholesteric liquid crystal layer (13) corresponding to the static pattern background area (110) is in a fog state, and the cholesteric liquid crystal layer (13) corresponding to the static pattern display area (120) is in a reflective state; or, if the third electrical signal (V3) is applied to the first viewing angle electrode (121) and the second electrical signal (V2) is applied to the second viewing angle electrode (122), the cholesteric liquid crystal layer (13) corresponding to the static pattern background area (110) is in a reflective state, and the cholesteric liquid crystal layer (13) corresponding to the static pattern display area (120) is in a fog state.

7. The driving method according to claim 6, characterized in that, The first preset value is 25V, the second preset value is 30V, and the first preset time is 0.2 to 1 second.

Images