Transmission and mirror switchable display panel, driving method, and display device

Abstract

The present invention discloses a display panel and a driving method and a display device with switchable transmission and mirror. The display panel comprises a color film substrate, an array substrate arranged opposite to the color film substrate, and a liquid crystal layer located between the color film substrate and the array substrate. A first polarizer is arranged on the color film substrate, and a second polarizer is arranged on the array substrate. The light transmission axes of the first polarizer and the second polarizer are perpendicular to each other. The display panel comprises a plurality of pixel units, each pixel unit comprises a transmission area and a reflection area. A first pixel electrode, a second pixel electrode, and a metal wire grid polarizer formed by a plurality of metal wire grids are arranged on the array substrate. The first pixel electrode corresponds to the transmission area, and the metal wire grid polarizer and the second pixel electrode both correspond to the reflection area. The light transmission axis of the metal wire grid polarizer is parallel to the light transmission axis of the first polarizer. The present invention can not only independently control the transmission area and the reflection area, but also simplify the structure of the display panel and reduce the box thickness of the display panel.

Description

Technical Field

[0001] The present invention relates to the technical field of displays, and in particular to a display panel and a driving method and a display device capable of switching between transmission and mirror. Background Art

[0002] With the development and progress of liquid crystal display technology, people have higher and higher requirements for liquid crystal display devices. At present, a display device that can be used as a mirror and for display is very popular, that is, a mirror display device.

[0003] The preparation of existing mirror display devices usually adopts a method of pasting a semi-reflective and semi-transparent film on the outgoing light of the display panel. When displaying, the light from the backlight passes through the display panel to form a color picture for display; when the display is completed, the light from the external environment shines on the semi-reflective and semi-transparent film to achieve mirror display. The photoelectric characteristic matching between the transmission mode and the reflection mode is a very important issue. In order to solve the imbalance of the photoelectric response, the prior art proposes a double-cell thick structure transflective liquid crystal display using an electrically controlled birefringent liquid crystal mode to compensate for the different liquid crystal cell gaps in the transmission mode and the reflection mode.

[0004] Although the liquid crystal display device in the prior art realizes the functions of transmission and mirror, the following problems still exist: 1. During transmission display, mirror reflection also exists at the same time, and the reflected light cannot be turned off. Mirror ghosting is likely to occur under ambient light, which will have a great impact on normal transmission display; 2. The double-box thickness design can reduce mirror reflection during normal display, but it also needs to be matched with at least one layer of 1 / 4 wave plate, which increases the thickness, cost and process difficulty. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a display panel with switchable transmission and mirror, a driving method, and a display device to solve the problems in the prior art that the transmission and mirror of the display panel cannot be controlled separately and the box thickness is relatively thick.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The present invention provides a display panel capable of switching between transmission and mirror, comprising a color film substrate, an array substrate arranged opposite to the color film substrate, and a liquid crystal layer located between the color film substrate and the array substrate, wherein the color film substrate is provided with a first polarizer on a side away from the liquid crystal layer, and the array substrate is provided with a second polarizer on a side away from the liquid crystal layer, and the light transmission axes of the first polarizer and the second polarizer are perpendicular to each other; the display panel has a plurality of pixel units, each pixel unit comprises a transmission area and a reflection area, the array substrate is provided with a first pixel electrode, a second pixel electrode, and a metal wire grid polarizer formed by a plurality of metal wire grids on a side facing the liquid crystal layer, the first pixel electrode corresponds to the transmission area, the metal wire grid polarizer and the second pixel electrode both correspond to the reflection area, and the light transmission axis of the metal wire grid polarizer is parallel to the light transmission axis of the first polarizer.

[0008] Furthermore, a first common electrode is provided on the color filter substrate, the alignment direction of the liquid crystal layer close to the color filter substrate is parallel to the light transmission axis of the first polarizer, and the alignment direction of the liquid crystal layer close to the array substrate is parallel to the light transmission axis of the second polarizer.

[0009] Further, the metal wire grid polarizer is reused as the second pixel electrode; or, the second pixel electrode and the metal wire grid polarizer are located in different layers and are insulated and spaced apart from each other.

[0010] Furthermore, a second common electrode is disposed on the array substrate, and the alignment direction of the liquid crystal layer on a side close to the color filter substrate is parallel to the alignment direction of the liquid crystal layer on a side close to the array substrate or in parallel directions.

[0011] Furthermore, the second pixel electrode and the metal wire grid polarizer are located in different layers and are insulated and spaced apart from each other, and the metal wire grid polarizer is in contact with a surface of the second common electrode.

[0012] Furthermore, the second pixel electrode is a strip structure and corresponds to a row or a column of the reflective area, a plurality of the second pixel electrodes are electrically connected to each other in the non-display area, and the array substrate is provided with a plurality of scanning lines, a plurality of data lines and a plurality of thin film transistors on the side facing the liquid crystal layer, and the first pixel electrode is electrically connected to the corresponding scanning lines and the data lines through the thin film transistors.

[0013] Furthermore, the second pixel electrode corresponds one-to-one to the reflective area, and the array substrate is provided with a plurality of scanning lines, a plurality of data lines and a plurality of thin film transistors on a side facing the liquid crystal layer, and two thin film transistors are correspondingly provided in each pixel unit, and the first pixel electrode is electrically connected to the corresponding scanning line and the data line through one of the thin film transistors, and the second pixel electrode is electrically connected to the corresponding scanning line and the data line through another one of the thin film transistors.

[0014] Furthermore, the first pixel electrode and the second pixel electrode are respectively connected to different scan lines and / or data lines through the two thin film transistors.

[0015] The present application also provides a display device, comprising the above-mentioned display panel capable of switching between transmission and mirror.

[0016] The present application also provides a transmission and mirror switchable driving method, the driving method is used to drive the transmission and mirror switchable display panel as described above, the driving method comprising:

[0017] In the transmission mode, the backlight module is turned on, the corresponding grayscale voltage signal is applied to the first pixel electrode, the transmission area is opened, the dark state voltage signal is applied to the second pixel electrode, and the reflection area is closed; in the reflection mode, the backlight module is turned off, the transmission area is closed, the bright state voltage signal is applied to the second pixel electrode, and the reflection area is opened.

[0018] The beneficial effects of the present invention are as follows: a first pixel electrode, a second pixel electrode, and a metal wire grid polarizer formed by a plurality of metal wire grids are arranged on the array substrate, the first pixel electrode corresponds to the transmission area, the metal wire grid polarizer and the second pixel electrode both correspond to the reflection area, the first pixel electrode and the second pixel electrode independently control the light and dark states of the transmission area and the reflection area, and realize the separate control functions of the transmission and the mirror surface; and the metal wire grid polarizer is also used to reflect the ambient light, so that there is no need to adopt a double liquid crystal box structure, a reflective metal layer, and a 1 / 4 wave plate, which greatly simplifies the structure of the display panel, reduces the box thickness of the display panel, and reduces the difficulty and cost of the display panel manufacturing process. The architecture of the present invention (transmission display) is relatively simple, and its optical path diagram does not require multiple phase delays, and the displayed color will not be much different from the existing display, which is easier for users to accept. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the planar structure of the color film substrate in the first embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the planar structure of the array substrate in the first embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of circuit connections of a metal wire grid polarizer in Embodiment 1 of the present invention;

[0022] Figure 4 Schematic diagram of the principle of the metal wire grid polarizer in the first embodiment of the present invention;

[0023] Figure 5 is a schematic structural diagram of a display panel in an initial state in Embodiment 1 of the present invention;

[0024] Figure 6 is a schematic diagram of light rays of the display panel in the transmission mode in the first embodiment of the present invention;

[0025] Figure 7 yes Figure 6 Schematic diagram of the principle of the medium transmission area;

[0026] Figure 8 yes Figure 6 Schematic diagram of the principle of the middle reflection area;

[0027] Fig. 9 is a schematic diagram of light rays of the display panel in the reflection mode in the first embodiment of the present invention;

[0028] Fig.10 yes Fig. 9 Schematic diagram of the principle of the medium transmission area;

[0029] Fig.11 yes Fig. 9 Schematic diagram of the principle of the middle reflection area;

[0030] Figure 12a-12h This is one of the schematic diagrams of the manufacturing process of the metal wire grid polarizer in the first embodiment of the present invention;

[0031] Figures 13a-13h This is the second schematic diagram of the manufacturing process of the metal wire grid polarizer in the first embodiment of the present invention;

[0032] Fig.14 is a schematic structural diagram of a display panel in an initial state in Embodiment 2 of the present invention;

[0033] Fig.15 is a schematic diagram of the planar structure of the array substrate in the second embodiment of the present invention;

[0034] Fig.16 is a circuit connection diagram of a metal wire grid polarizer in Embodiment 2 of the present invention;

[0035] Fig.17 is a schematic diagram of light in the display panel in the transmission mode in the second embodiment of the present invention;

[0036] Fig.18 yes Fig.17Schematic diagram of the principle of the medium transmission area;

[0037] Fig.19 yes Fig.17 Schematic diagram of the principle of the middle reflection area;

[0038] Fig. 20 is a schematic diagram of light rays of the display panel in the reflection mode in the second embodiment of the present invention;

[0039] Fig.21 yes Fig. 20 Schematic diagram of the principle of the medium transmission area;

[0040] Fig. 22 yes Fig. 20 Schematic diagram of the principle of the middle reflection area;

[0041] Fig.23 is a schematic diagram of the planar structure of the array substrate in the third embodiment of the present invention;

[0042] Fig.24 It is a schematic diagram of the planar structure of the array substrate in the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation, structure, features and effects of the display panel and driving method and the display device that can switch between transmission and mirror according to the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments:

[0044] [Example 1]

[0045] Figure 1 It is a schematic diagram of the planar structure of the color film substrate in the first embodiment of the present invention. Figure 2 It is a schematic diagram of the planar structure of the array substrate in the first embodiment of the present invention. Figure 3 It is a schematic diagram of the circuit connection of the metal wire grid polarizer in the first embodiment of the present invention. Figure 4 It is a schematic diagram of the principle of the metal wire grid polarizer in the first embodiment of the present invention. Figure 5 It is a schematic structural diagram of the display panel in the initial state in the first embodiment of the present invention.

[0046] like Figures 1 to 5 As shown, a display panel switchable between transmission and mirror provided in the first embodiment of the present invention comprises a color filter substrate 10, an array substrate 20 arranged opposite to the color filter substrate 10, and a liquid crystal layer 30 located between the color filter substrate 10 and the array substrate 20. In this embodiment, the liquid crystal molecules in the liquid crystal layer 30 are positive liquid crystal molecules (liquid crystal molecules with positive dielectric anisotropy), such as Figure 5As shown, in the initial state, the liquid crystal molecules in the liquid crystal layer 30 are positive liquid crystal molecules and are in a flat posture, and the alignment direction on one side of the color filter substrate 10 is perpendicular to the alignment direction on one side of the array substrate 20, that is, the alignment directions of the positive liquid crystal molecules close to the color filter substrate 10 and the positive liquid crystal molecules close to the array substrate 20 are perpendicular to each other, so that the positive liquid crystal molecules in the liquid crystal layer 30 are twisted from top to bottom to form a TN display mode. Of course, the liquid crystal molecules in the liquid crystal layer 30 can also have a pre-tilt angle of 0-7° when initially aligned. For example, the pre-tilt angle of the liquid crystal molecules in the liquid crystal layer 30 is 4° when initially aligned, thereby accelerating the response speed of the liquid crystal molecules deflecting toward the vertical direction.

[0047] The color filter substrate 10 is provided with a first polarizer 41 on the side away from the liquid crystal layer 30, and the array substrate 20 is provided with a second polarizer 42 on the side away from the liquid crystal layer 30, and the light transmission axes of the first polarizer 41 and the second polarizer 42 are perpendicular to each other. The alignment direction of the liquid crystal layer 30 on the side close to the color filter substrate 10 is parallel to the light transmission axis of the first polarizer 41, and the alignment direction of the liquid crystal layer 30 on the side close to the array substrate 20 is parallel to the light transmission axis of the second polarizer 42. For example, if the light transmission axis of the first polarizer 41 is 0° and the light transmission axis of the second polarizer 42 is 90°, then the alignment direction of the liquid crystal layer 30 on the side close to the color filter substrate 10 is 0°, and the alignment direction of the liquid crystal layer 30 on the side close to the array substrate 20 is 90°.

[0048] like Figure 1 and Figure 2 As shown, the display panel has a plurality of pixel units P, each pixel unit P includes a transmission area T and a reflection area R. The array substrate 20 is formed by a plurality of scanning lines and a plurality of data lines that are insulated and crossed on the side facing the liquid crystal layer 30 to form a plurality of pixel units P. The array substrate 20 is provided with a first pixel electrode 23, a second pixel electrode 25, and a metal wire grid polarizer 24 formed by a plurality of metal wire grids on the side facing the liquid crystal layer 30. The first pixel electrode 23 corresponds to the transmission area T, and the metal wire grid polarizer 24 and the second pixel electrode 25 both correspond to the reflection area R. The light transmission axis of the metal wire grid polarizer 24 is parallel to the light transmission axis of the first polarizer 41, and the light reflection axis of the metal wire grid polarizer 24 is parallel to the light transmission axis of the second polarizer 42. For example, the light transmission axis of the first polarizer 41 is 0°, and the light transmission axis of the second polarizer 42 is 90°, then the light transmission axis of the metal wire grid polarizer 24 is 0°, and the light reflection axis of the metal wire grid polarizer 24 is 90°. The sizes of the transmission area T and the reflection area R can be set according to actual conditions. For example, the ratio of the transmission area T to the reflection area R can be 1:1 or 3:1.

[0049] like Figure 4As shown, the metal wire grid polarizer 24 has a special polarization property, that is, it can transmit polarized light perpendicular to the extension direction of the metal wire grid and reflect polarized light parallel to the extension direction of the metal wire grid. In the incident light A, the polarization direction of the light has a first polarized light a perpendicular to the extension direction of the metal wire grid and a second polarized light b parallel to the extension direction of the metal wire grid, and the first polarized light a perpendicular to the extension direction of the metal wire grid can pass through the metal wire grid polarizer 24 to form a transmitted light C, and the second polarized light b parallel to the extension direction of the metal wire grid will be reflected to form a reflected light B. For a more detailed introduction to the metal wire grid polarizer 24, please refer to the prior art, which will not be repeated here. In this embodiment, the width of the metal wire grid is w, the spacing is p, and the height is t, preferably w is 82nm, p is 60nm, and t is 180nm, and it is made by nanoimprinting technology.

[0050] like Figure 1 and Figure 2 As shown, in this embodiment, the second pixel electrode 25 is a strip-shaped structure and corresponds to a row of reflective regions R. Figure 3 As shown, a plurality of second pixel electrodes 25 are electrically connected to each other in the non-display area, that is, all the second pixel electrodes 25 are applied with the same voltage signal, so that all the reflective regions R can be controlled to be turned on or off at the same time. For example, peripheral electrode strips (for example, formed by the first metal layer or the second metal layer) are formed on both sides of the non-display area of ​​the array substrate 20, and both ends of the second pixel electrode 25 are peripheral circuits, which are electrically connected to the peripheral electrode strips through the conductive holes, and the peripheral electrode strips are connected to the control chip to control all the second pixel electrodes 25 to apply the same signal. Of course, in other embodiments, the second pixel electrode 25 is a strip structure, and corresponds to a column of reflective regions R.

[0051] Furthermore, the array substrate 20 is provided with a plurality of thin film transistors on the side facing the liquid crystal layer 30, and a thin film transistor is correspondingly provided in each pixel unit P, and the first pixel electrode 23 is electrically connected to the corresponding scan line and data line 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 line are located in the same layer and are electrically connected, the gate and the active layer are separated by an insulating layer, the source is electrically connected to the data line, and the drain is electrically connected to the first pixel electrode 23 through a contact hole.

[0052] In this embodiment, the metal wire grid polarizer 24 is reused as the second pixel electrode 25. Since the metal wire grid polarizer 24 is made of metal only and has a certain conductivity, the metal wire grid polarizer 24 is reused as the second pixel electrode 25, which can simplify the structure and manufacturing process of the array substrate 20. Accordingly, the structure and position of the metal wire grid polarizer 24 are the same as those of the second pixel electrode 25, which will not be repeated here. Of course, in other embodiments, the second pixel electrode 25 can also be located in a different layer from the metal wire grid polarizer 24 and insulated and spaced apart from each other, that is, an additional transparent metal layer is provided to make the second pixel electrode 25. Alternatively, the metal wire grid polarizer 24 and the second pixel electrode 25 are located in different layers and the metal wire grid polarizer 24 is directly provided on the upper surface or the lower surface of the second pixel electrode 25. In this embodiment, the metal wire grid polarizer 24 can not only realize the effect of reflective display, but also reduce the impedance of the second pixel electrode 25, thereby reducing the driving power consumption and achieving the effect of energy saving.

[0053] Furthermore, the metal wire grid polarizer 24 and the first pixel electrode 23 are located in the same layer. Figure 5 As shown, the metal wire grid polarizer 24 and the first pixel electrode 23 are both located on the surface of the insulating layer 22 facing the liquid crystal layer 30. In other embodiments, the metal wire grid polarizer 24 and the first pixel electrode 23 may also be located in different layers, that is, the second pixel electrode 25 and the first pixel electrode 23 may also be located in different layers.

[0054] like Figure 5 As shown, a first common electrode 14 is disposed on the color filter substrate 10 . The first common electrode 14 is a whole-surface structure, that is, the first common electrode 14 corresponds to the transmission area T and the reflection area R at the same time.

[0055] Furthermore, a black matrix 11 and a color resist material layer 12 are also provided on the color filter substrate 10. The color resist material layer 12 includes color resist materials of red (R), green (G), and blue (B), and correspondingly forms sub-pixels of red (R), green (G), and blue (B). The transmission area T and the reflection area R are separated by the black matrix 11. In this embodiment, the color resist material layer 12 is provided in the area of ​​the color filter substrate 10 corresponding to the transmission area T, and the area of ​​the color filter substrate 10 corresponding to the reflection area R is covered by the flat layer 13 and is transparent, that is, no color resist material is provided. In the reflection mode, the reflection area R is in black and white. Of course, in other embodiments, when the reflection mode needs to present color, the color resist material layer 12 can also be provided in the area of ​​the color filter substrate 10 corresponding to the reflection area R, so that color can be reflected in the reflection mode.

[0056] The color filter substrate 10 and the array substrate 20 may be made of glass, acrylic, polycarbonate, etc. The first common electrode 14 and the first pixel electrode 23 may be made of indium tin oxide (ITO) or indium zinc oxide (IZO), etc. The metal wire grid polarizer 24 may be made of aluminum, molybdenum, molybdenum oxide, etc.

[0057] Figure 12a-12h FIG. 1 is one of the schematic diagrams of the manufacturing process of the metal wire grid polarizer in the first embodiment of the present invention. Figure 12a-12h As shown, this embodiment also provides a method for manufacturing a metal wire grid polarizer, which is used to manufacture the metal wire grid polarizer 24 as described above, and the manufacturing method includes:

[0058] like Fig.12a As shown, a transparent substrate 1 is provided, and a first metal layer 2 and a second metal layer 3 are sequentially covered on the transparent substrate 1, wherein the first metal layer 2 is metal aluminum and the second metal layer 3 is metal molybdenum. The transparent substrate 1 can be made of materials such as glass, quartz, silicon, acrylic acid or polycarbonate.

[0059] like Figure 12b As shown, the second metal layer 3 is oxidized to form a metal oxide layer 31. The metal oxide layer 31 is molybdenum oxide, which is black, and can avoid the problem of the built-in metal wire grid reflecting metallic luster.

[0060] like Fig.12c As shown, the first photoresist layer 4 covers the metal oxide layer 31 .

[0061] like Figure 12d-12e As shown, the first photoresist layer 4 is patterned. Specifically, a patterned imprinting mold 5 is provided, and the first photoresist layer 4 is imprinted by the imprinting mold 5, so that the first photoresist layer 4 forms a patterned structure corresponding to the metal wire grid polarizer 24. Of course, in other embodiments, the first photoresist layer 4 can also be patterned by using processes such as exposure and development, but the process steps will be increased.

[0062] like Figure 12f-12g As shown, the first metal layer 2 and the metal oxide layer 31 are etched with the first photoresist layer 4 as a barrier, so that the first metal layer 2 and the metal oxide layer 31 form a plurality of metal wire grids that are parallel to each other and spaced apart, and the plurality of metal wire grids together form a metal wire grid polarizer 24. Then, the first photoresist layer 4 is removed to expose the metal wire grid polarizer 24. The metal wire grid polarizer 24 corresponds to the reflection area R.

[0063] like Figure 12hAs shown, finally, a planarization layer is covered on the metal wire grid polarizer 24 to planarize the metal wire grid polarizer 24 and to protect the metal wire grid polarizer 24 to a certain extent.

[0064] Figures 13a-13h FIG. 2 is a second schematic diagram of the manufacturing process of the metal wire grid polarizer in the first embodiment of the present invention. Figures 13a-13h As shown, this embodiment also provides a method for manufacturing a metal wire grid polarizer, which is used to manufacture the metal wire grid polarizer 24 as described above, and the manufacturing method includes:

[0065] like Fig.13a As shown, a transparent substrate 1 is provided, and a first metal layer 2, a second metal layer 3 and a first photoresist layer 4 are sequentially covered on the transparent substrate 1. The first metal layer 2 is metal aluminum, and the second metal layer 3 is metal molybdenum. The transparent substrate 1 can be made of materials such as glass, quartz, silicon, acrylic acid or polycarbonate.

[0066] like Fig.13b As shown, the first photoresist layer 4 is patterned. Nanoimprint technology ( Figure 13e-13f ) The first photoresist layer 4 is patterned, or the first photoresist layer 4 is patterned by exposure and development processes. Thus, the first photoresist layer 4 shields the peripheral circuit area.

[0067] like Fig.13c As shown, the second metal layer 3 is oxidized with the first photoresist layer 4 as a shield, so that the exposed area of ​​the second metal layer 3 forms a metal oxide layer 31, and the area shielded by the first photoresist layer 4 is not oxidized. The metal oxide layer 31 is molybdenum oxide, which is black, and can avoid the problem of the built-in metal wire grid reflecting metallic luster. Then, the first photoresist layer 4 is removed to leak out the second metal layer 3 that has not been oxidized.

[0068] like Fig.13d As shown, the second photoresist layer 6 covers the metal oxide layer 31 and the unoxidized second metal layer 3 .

[0069] like Figure 13e-13f As shown, the second photoresist layer 6 is patterned. Specifically, a patterned imprinting mold 5 is provided, and the second photoresist layer 6 is imprinted by the imprinting mold 5, so that the second photoresist layer 6 forms a patterned structure corresponding to the metal wire grid polarizer 24 and the peripheral circuit area. Of course, in other embodiments, the second photoresist layer 6 can also be patterned by exposure and development processes, but the process steps will be increased.

[0070] like Figure 13gAs shown, the first metal layer 2 and the metal oxide layer 31 are etched with the second photoresist layer 6 as a barrier, so that the first metal layer 2 and the metal oxide layer 31 form a plurality of metal wire grids that are parallel to each other and spaced apart, and the plurality of metal wire grids together form a metal wire grid polarizer 24, and the unoxidized second metal layer 3 and the first metal layer 2 below form a peripheral circuit 33 (for example, a signal line connecting the metal wire grid polarizer 24 in the non-display area). Then, the second photoresist layer 6 is removed to expose the metal wire grid polarizer 24 and the peripheral circuit 33. Among them, the metal wire grid polarizer 24 corresponds to the reflection area R. By making the peripheral circuit 33 at the same time as making the metal wire grid polarizer 24, the manufacturing process is simplified and the manufacturing cost is reduced. The peripheral circuit 33 is connected to the peripheral electrode strip made of the first metal layer or the second metal layer through the contact hole of the lower insulating layer, and the metal wire grid polarizer 24 receives the corresponding voltage signal through the peripheral electrode strip.

[0071] like Fig.13h As shown, finally, a planarization layer is covered on the metal wire grid polarizer 24 and the peripheral circuit 33 to planarize the metal wire grid polarizer 24 and the peripheral circuit 33 and to protect the metal wire grid polarizer 24 and the peripheral circuit 33 to a certain extent.

[0072] The present application also provides a display device, comprising the above-mentioned display panel that can switch between transmission and mirror. The display device also includes a backlight module, which is located below the display panel and is used to provide a backlight source for the display device.

[0073] Figure 6 FIG. 1 is a schematic diagram of light when the display panel is in the transmission mode in the first embodiment of the present invention. Figure 7 yes Figure 6 Schematic diagram of the principle of the medium transmission region. Figure 8 yes Figure 6 Schematic diagram of the principle of the middle reflection area. Fig. 9 Schematic diagram of light when the display panel is in the reflection mode in the first embodiment of the present invention. Fig.10 yes Fig. 9 Schematic diagram of the principle of the medium transmission region. Fig.11 yes Fig. 9 Schematic diagram of the principle of the middle reflection area. Figure 6-Figure 11 As shown, the present application also provides a transmission and mirror switchable driving method, which is used to drive the transmission and mirror switchable display panel as described above. The driving method includes:

[0074] like Figure 6As shown, in the transmission mode, the backlight module is turned on to provide a backlight source for the display device. A corresponding grayscale voltage signal (0-255 grayscale) is applied to the first pixel electrode 23, the transmission area T is turned on, and the transmission area T can display a normal picture; and a dark state voltage signal (for example, 5V) is applied to the second pixel electrode 25 (i.e., the metal wire grid polarizer 24), and a strong vertical electric field ( Figure 6 In E1), the positive liquid crystal molecules corresponding to the reflection area R are deflected in the vertical direction and take a standing posture, and the reflection area R is closed.

[0075] like Figure 7 As shown, in the transmission mode, for the transmission area T, the light BL of the backlight source forms linear polarized light parallel to the light transmission axis of the second polarizer 42 after passing through the second polarizer 42, and then the polarization direction is rotated by 90° after passing through the 90° twisted liquid crystal layer 30, that is, it is parallel to the light transmission axis of the first polarizer 41, and is emitted from the first polarizer 41. The transmission area T is in an open state (bright state), and the transmission display is realized, and a normal picture can be displayed. The external ambient light I forms linear polarized light parallel to the light transmission axis of the first polarizer 41 after passing through the first polarizer 41, and then the polarization direction is rotated by 90° after passing through the 90° twisted liquid crystal layer 30, that is, it is parallel to the light transmission axis of the second polarizer 42, and is emitted from the second polarizer 42 to the backlight module.

[0076] like Figure 8 As shown, in the transmission mode, for the reflection area R, the light BL of the backlight source forms linear polarized light parallel to the light transmission axis of the second polarizer 42 after passing through the second polarizer 42, that is, parallel to the light reflection axis of the metal wire grid polarizer 24, and then is reflected back by the metal wire grid polarizer 24 for reuse. The external ambient light I forms linear polarized light parallel to the light transmission axis of the first polarizer 41 after passing through the first polarizer 41, and then passes through the liquid crystal layer 30 in a standing posture. The polarization state of the external ambient light I does not change, and it still remains linear polarized light parallel to the light transmission axis of the first polarizer 41, that is, parallel to the light transmission axis of the metal wire grid polarizer 24, and then passes through the metal wire grid polarizer 24 and is absorbed by the second polarizer 42. Therefore, the reflection area R is in a closed state (dark state).

[0077] like Fig. 9As shown, in the reflective mode, the backlight module is turned off. Since there is no backlight source, the transmission area T is in a closed state (dark state). Of course, no voltage is applied to the first pixel electrode 23. A bright state voltage signal (e.g., 0-0.8V) is applied to the second pixel electrode 25, and substantially no vertical electric field is formed between the second pixel electrode 25 (i.e., the metal wire grid polarizer 24) and the first common electrode 14. The positive liquid crystal molecules corresponding to the reflective area R maintain the initial twisted 90° state, and the reflective area R is open.

[0078] like Fig.10 As shown, in the reflection mode, for the transmission area T, the external ambient light I passes through the first polarizer 41 to form linear polarized light parallel to the transmission axis of the first polarizer 41, and then passes through the 90° twisted liquid crystal layer 30, and the polarization direction is rotated 90°, that is, parallel to the transmission axis of the second polarizer 42, and is emitted from the second polarizer 42 to the backlight module. Therefore, the transmission area T is in a closed state (dark state).

[0079] like Fig.11 As shown, in the reflection mode, for the reflection area R, the external ambient light I passes through the first polarizer 41 to form linear polarized light parallel to the light transmission axis of the first polarizer 41, and then passes through the liquid crystal layer 30 twisted by 90°, the polarization direction is rotated by 90°, that is, it is parallel to the reflection axis of the metal wire grid polarizer 24, and then is reflected back by the metal wire grid polarizer 24, and then passes through the liquid crystal layer 30 twisted by 90°, the polarization direction is rotated by 90°, that is, the light transmission axes of the first polarizer 41 are parallel to each other, and is emitted from the first polarizer 41, therefore, the reflection area R is in an open state (bright state).

[0080] [Example 2]

[0081] Fig.14 It is a schematic diagram of the structure of the display panel in the initial state in the second embodiment of the present invention. Fig.15 It is a schematic diagram of the planar structure of the array substrate in the second embodiment of the present invention. Fig.16 It is a circuit connection diagram of the metal wire grid polarizer in the second embodiment of the present invention.

[0082] like Figure 14-16 As shown, a display panel switchable between transmission and mirror surface provided in the second embodiment of the present invention includes a color filter substrate 10, an array substrate 20 arranged opposite to the color filter substrate 10, and a liquid crystal layer 30 located between the color filter substrate 10 and the array substrate 20. In this embodiment, the liquid crystal molecules in the liquid crystal layer 30 are negative liquid crystal molecules (liquid crystal molecules with negative dielectric anisotropy), such as Fig.14As shown, in the initial state, the liquid crystal molecules in the liquid crystal layer 30 are negative liquid crystal molecules and are in a flat posture, and the alignment direction on one side of the color filter substrate 10 is parallel or anti-parallel to the alignment direction on one side of the array substrate 20, that is, the alignment direction of the negative liquid crystal molecules in the liquid crystal layer 30 close to the color filter substrate 10 is parallel or anti-parallel to the alignment direction of the negative liquid crystal molecules close to the array substrate 20. Of course, the liquid crystal molecules in the liquid crystal layer 30 may also have a pre-tilt angle of 1° during the initial alignment. In other embodiments, the liquid crystal molecules in the liquid crystal layer 30 may also be positive liquid crystal molecules.

[0083] The color filter substrate 10 is provided with a first polarizer 41 on a side away from the liquid crystal layer 30, and the array substrate 20 is provided with a second polarizer 42 on a side away from the liquid crystal layer 30, and the light transmission axes of the first polarizer 41 and the second polarizer 42 are perpendicular to each other. The alignment direction of the liquid crystal layer 30 can be parallel to the light transmission axis of the first polarizer 41, or parallel to the light transmission axis of the second polarizer 42. For example, the light transmission axis of the first polarizer 41 is 0°, and the light transmission axis of the second polarizer 42 is 90°, then the alignment direction of the liquid crystal layer 30 can be 0° or 90°.

[0084] refer to Figure 1 and Fig.15 As shown, the display panel has a plurality of pixel units P, each pixel unit P includes a transmission area T and a reflection area R. The array substrate 20 is formed by a plurality of scanning lines and a plurality of data lines that are insulated and crossed on the side facing the liquid crystal layer 30 to form a plurality of pixel units P. The array substrate 20 is provided with a first pixel electrode 23, a second pixel electrode 25, and a metal wire grid polarizer 24 formed by a plurality of metal wire grids on the side facing the liquid crystal layer 30. The first pixel electrode 23 and the second pixel electrode 25 are both strip-shaped structures, and the distance between adjacent electrode strips is generally about 3-5um. The first pixel electrode 23 corresponds to the transmission area T, and the metal wire grid polarizer 24 and the second pixel electrode 25 both correspond to the reflection area R. The light transmission axis of the metal wire grid polarizer 24 is parallel to the light transmission axis of the first polarizer 41, and the light reflection axis of the metal wire grid polarizer 24 is parallel to the light transmission axis of the second polarizer 42. For example, the light transmission axis of the first polarizer 41 is 0°, and the light transmission axis of the second polarizer 42 is 90°. Then, the light transmission axis of the metal wire grid polarizer 24 is 0°, and the light reflection axis of the metal wire grid polarizer 24 is 90°. The sizes of the transmission area T and the reflection area R can be set according to actual conditions. For example, the ratio of the transmission area T to the reflection area R can be 1:1 or 3:1.

[0085] refer to Figure 4As shown, the metal wire grid polarizer 24 has a special polarization property, that is, it can transmit polarized light perpendicular to the extension direction of the metal wire grid and reflect polarized light parallel to the extension direction of the metal wire grid. In the incident light A, the polarization direction of the light has a first polarized light a perpendicular to the extension direction of the metal wire grid and a second polarized light b parallel to the extension direction of the metal wire grid, and the first polarized light a perpendicular to the extension direction of the metal wire grid can pass through the metal wire grid polarizer 24 to form a transmitted light C, and the second polarized light b parallel to the extension direction of the metal wire grid will be reflected to form a reflected light B. For a more detailed introduction to the metal wire grid polarizer 24, please refer to the prior art, which will not be repeated here. In this embodiment, the width of the metal wire grid is w, the spacing is p, and the height is t, preferably w is 82nm, p is 60nm, and t is 180nm, and it is made by nanoimprinting technology.

[0086] like Fig.15 and Fig.16 As shown, in this embodiment, the second pixel electrode 25 is a strip-shaped structure and corresponds to a row of reflective regions R. Fig.16 As shown, a plurality of second pixel electrodes 25 are electrically connected to each other in the non-display area, that is, all the second pixel electrodes 25 apply the same voltage signal, so that all the reflective regions R can be controlled to be turned on or off at the same time. For example, electrode strips are formed on both sides of the array substrate 20, and the second pixel electrodes 25 are electrically connected to the electrode strips through the conductive holes, and the electrode strips are connected to the control chip to control all the second pixel electrodes 25 to apply the same signal. Of course, in other embodiments, the second pixel electrodes 25 are strip-shaped structures and correspond to a column of reflective regions R.

[0087] Furthermore, the array substrate 20 is provided with a plurality of thin film transistors on the side facing the liquid crystal layer 30, and a thin film transistor is correspondingly provided in each pixel unit P, and the first pixel electrode 23 is electrically connected to the corresponding scan line and data line 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 line are located in the same layer and are electrically connected, the gate and the active layer are separated by an insulating layer, the source is electrically connected to the data line, and the drain is electrically connected to the first pixel electrode 23 through a contact hole.

[0088] In this embodiment, a second common electrode 21 is further provided on the array substrate 20. The second pixel electrode 25 is located in the same layer as the first pixel electrode 23. The second pixel electrode 25 and the first pixel electrode 23 are located in different layers from the metal wire grid polarizer 24 and are insulated and spaced apart from each other. The second pixel electrode 25 and the first pixel electrode 23 are located in different layers from the second common electrode 21 and are isolated by the insulating layer 22. The metal wire grid polarizer 24 is in contact with the surface of the second common electrode 21, and the metal wire grid polarizer 24 is arranged between the second pixel electrode 25 and the second common electrode 21. The metal wire grid polarizer 24 can not only realize the function of reflective display, but also reduce the impedance of the second common electrode 21, thereby reducing driving power consumption and realizing energy saving. The second common electrode 21 is a whole-surface structure, and the first pixel electrode 23 is a comb-shaped electrode with slits. The second common electrode 21 can be located above or below the first pixel electrode 23 and the second pixel electrode 25 ( Fig.14 As shown in FIG. 1 , the second common electrode 21 is located below the first pixel electrode 23 and the second pixel electrode 25 to form a fringe field switching mode (Fringe Field Switching, FFS).

[0089] like Fig.14 As shown, a black matrix 11 and a color resist material layer 12 are provided on the color filter substrate 10. The color resist material layer 12 includes color resist materials of red (R), green (G), and blue (B), and correspondingly forms sub-pixels of red (R), green (G), and blue (B). The transmission area T and the reflection area R are separated by the black matrix 11. In this embodiment, the color resist material layer 12 is provided in the area of ​​the color filter substrate 10 corresponding to the transmission area T, and the area of ​​the color filter substrate 10 corresponding to the reflection area R is covered by the flat layer 13 and is transparent, that is, no color resist material is provided. In the reflection mode, the reflection area R is in black and white. Of course, in other embodiments, when the reflection mode needs to present color, the color resist material layer 12 can also be provided in the area of ​​the color filter substrate 10 corresponding to the reflection area R, so that color can be reflected in the reflection mode.

[0090] The color filter substrate 10 and the array substrate 20 may be made of materials such as glass, acrylic, and polycarbonate. The second common electrode 21, the first pixel electrode 23, and the second pixel electrode 25 may be made of materials such as indium tin oxide (ITO) or indium zinc oxide (IZO), and the metal wire grid polarizer 24 may be made of materials such as aluminum, molybdenum, and molybdenum oxide.

[0091] This embodiment also provides a method for manufacturing a metal wire grid polarizer. The method is used to manufacture the metal wire grid polarizer 24 as described above. The method comprises: Figure 12a-12h The metal wire grid polarizer 24 is manufactured by the method steps described in the first embodiment and will not be described again here.

[0092] Of course, in other embodiments, reference may be made to Figures 13a-13h When the second metal layer 3 is oxidized, the peripheral circuit area can be kept unoxidized, so that the unoxidized second metal layer 3 and the first metal layer 2 below form a peripheral circuit 33 (for example, a signal line connecting the metal wire grid polarizer 24 in the non-display area). By manufacturing the peripheral circuit 33 while manufacturing the metal wire grid polarizer 24, the manufacturing process is simplified and the manufacturing cost is reduced.

[0093] The present application also provides a display device, comprising the above-mentioned display panel that can switch between transmission and mirror. The display device also includes a backlight module, which is located below the display panel and is used to provide a backlight source for the display device.

[0094] Fig.17 FIG. 1 is a schematic diagram of light rays of the display panel in the transmission mode in the second embodiment of the present invention. Fig.18 yes Fig.17 Schematic diagram of the principle of the medium transmission region. Fig.19 yes Fig.17 Schematic diagram of the principle of the middle reflection area. Fig. 20 Schematic diagram of light when the display panel is in the reflection mode in the second embodiment of the present invention. Fig.21 yes Fig. 20 Schematic diagram of the principle of the medium transmission region. Fig. 22 yes Fig. 20 Schematic diagram of the principle of the middle reflection area. Figure 17-Figure 22 As shown, the present application also provides a transmission and mirror switchable driving method, which is used to drive the transmission and mirror switchable display panel as described above. The driving method includes:

[0095] like Fig.17 As shown, in the transmission mode, the backlight module is turned on to provide a backlight source for the display device. A corresponding grayscale voltage signal (0-255 grayscale) is applied to the first pixel electrode 23, the transmission area T is turned on, and the transmission area T can display a normal picture; and a dark state voltage signal (for example, 0V) is applied to the second pixel electrode 25, and a horizontal electric field is basically not formed between the second pixel electrode 25 and the second common electrode 21, and the negative liquid crystal molecules corresponding to the reflective area R maintain the initial lying state, and the reflective area R is closed.

[0096] like Fig.18As shown, in the transmission mode, for the transmission area T, the light BL of the backlight source passes through the second polarizer 42 to form a linear polarized light parallel to the transmission axis of the second polarizer 42, and then passes through the liquid crystal layer 30 with a λ / 4 phase delay to become a circular (elliptical) polarized light. Part of the circular (elliptical) polarized light is emitted from the first polarizer 41, and the transmission area T is in an open state (bright state), realizing transmission display, and can display a normal picture (with grayscale display). The external ambient light I passes through the first polarizer 41 to form a linear polarized light parallel to the transmission axis of the first polarizer 41, and then passes through the liquid crystal layer 30 with a λ / 4 phase delay to become a circular (elliptical) polarized light. Part of the circular (elliptical) polarized light is emitted from the second polarizer 42 to the backlight module.

[0097] like Fig.19 As shown, in the transmission mode, for the reflection area R, the light BL of the backlight source forms linear polarized light parallel to the light transmission axis of the second polarizer 42 after passing through the second polarizer 42, that is, parallel to the light reflection axis of the metal wire grid polarizer 24, and then is reflected back by the metal wire grid polarizer 24 for reuse. The external ambient light I forms linear polarized light parallel to the light transmission axis of the first polarizer 41 after passing through the first polarizer 41. After passing through the liquid crystal layer 30, the polarization state of the external ambient light I does not change, and it still remains linear polarized light parallel to the light transmission axis of the first polarizer 41, that is, parallel to the light transmission axis of the metal wire grid polarizer 24, and then passes through the metal wire grid polarizer 24 and is absorbed by the second polarizer 42. Therefore, the reflection area R is in a closed state (dark state).

[0098] like Fig. 20 As shown, in the reflection mode, the backlight module is turned off. Since there is no backlight source, the transmission area T is in a closed state (dark state). Of course, no voltage is applied to the first pixel electrode 23. A bright state voltage signal (e.g., 5V) is applied to the second pixel electrode 25, and a strong horizontal electric field ( Fig. 20 In E3), the negative liquid crystal molecules corresponding to the reflection area R are greatly deflected in the horizontal direction, and the reflection area R is opened.

[0099] like Fig.21 As shown, in the reflection mode, for the transmission zone T, the external ambient light I passes through the first polarizer 41 to form linear polarized light parallel to the transmission axis of the first polarizer 41. After passing through the liquid crystal layer 30, the polarization state of the external ambient light I does not change, and it still remains linear polarized light parallel to the transmission axis of the first polarizer 41, that is, it is perpendicular to the transmission axis of the second polarizer 42 and is absorbed by the second polarizer 42. Therefore, the transmission zone T is in a closed state (dark state).

[0100] like Fig. 22As shown, in the reflection mode, for the reflection area R, the external ambient light I passes through the first polarizer 41 to form linear polarized light parallel to the transmission axis of the first polarizer 41, and becomes circular (elliptical) polarized light after passing through the liquid crystal layer 30 with a λ / 4 phase delay. Part of the circular (elliptical) polarized light is reflected back by the metal wire grid polarizer 24, and the other part of the light passes through the metal wire grid polarizer 24 and the second polarizer 42 and is emitted to the backlight module. The reflected light passes through the liquid crystal layer 30 with a λ / 4 phase delay to become circular (elliptical) polarized light, and part of the light is emitted from the first polarizer 41. Therefore, the reflection area R is in an open state (bright state).

[0101] [Example 3]

[0102] Fig.23 Schematic diagram of the planar structure of the array substrate in the third embodiment of the present invention. Fig.23 As shown, the display panel and driving method and the display device that can switch between transmission and mirror provided in the second embodiment of the present invention are similar to those in the first embodiment ( Figures 1 to 11 ) or Example 2 ( Figures 14 to 22 ) are substantially the same as the display panel and driving method and display device of the embodiment of the present invention, except that, in the present embodiment, the first pixel electrodes 23 correspond to the transmission areas T one by one, and the second pixel electrodes 25 correspond to the reflection areas R one by one. Two thin film transistors are correspondingly arranged in each pixel unit P, the first pixel electrode 23 is electrically connected to the corresponding scan line and data line through one of the thin film transistors, and the second pixel electrode 25 is electrically connected to the corresponding scan line and data line through the other thin film transistor.

[0103] In this embodiment, the second pixel electrode 25 and the first pixel electrode 23 are connected to the same data line and different scan lines through two thin film transistors, respectively, and the voltage signal applied to the second pixel electrode 25 and the first pixel electrode 23 is controlled by one data line. Of course, in other embodiments, the second pixel electrode 25 and the first pixel electrode 23 are connected to the same scan line and different data lines through two thin film transistors, respectively.

[0104] Compared with the first or second embodiment, this embodiment can individually control the grayscale brightness of the reflection area R in each pixel unit P. In the reflection mode, the size of the reflection area in the display panel and the specific pattern of the reflection display can be controlled, and the controllability is better.

[0105] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1 or Embodiment 2, and will not be described in detail here.

[0106] [Example 4]

[0107] Fig.24FIG. 1 is a schematic diagram of the planar structure of the array substrate in the fourth embodiment of the present invention. Fig.24 As shown, the display panel and driving method, display device and embodiment 3 ( Fig.23 ) are basically the same as the display panel, driving method and display device with switchable transmission and mirror in the embodiment of the present invention, except that, in the present embodiment, the second pixel electrode 25 and the first pixel electrode 23 are respectively connected to different data lines and different scanning lines through two thin film transistors, and the voltage signals applied to the second pixel electrode 25 and the first pixel electrode 23 are respectively controlled through the two data lines. In the third embodiment, the second pixel electrode 25 and the first pixel electrode 23 are respectively connected to the same data line through two thin film transistors, so the voltage signal of the data line needs to be constantly switched during the switching process between the transmission mode and the reflection mode, which consumes a lot of power and affects the response speed; while in the present embodiment, the second pixel electrode 25 and the first pixel electrode 23 are respectively connected to different data lines through two thin film transistors, so under the same column inversion driving mode, the voltage signal of the data line is switched quickly and the power consumption is low, and the display effect is better.

[0108] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of the third embodiment, and will not be described in detail here.

[0109] In this document, the directional words such as up, down, left, right, front, and back are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second" used in this document are only used to distinguish names and are not used to limit quantity and order.

[0110] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A display panel that can switch between transmission and mirror, characterized in that: The invention comprises a color film substrate (10), an array substrate (20) arranged opposite to the color film substrate (10), and a liquid crystal layer (30) located between the color film substrate (10) and the array substrate (20), wherein the color film substrate (10) is provided with a first polarizing plate (41) on a side away from the liquid crystal layer (30), and the array substrate (20) is provided with a second polarizing plate (42) on a side away from the liquid crystal layer (30), and the light transmission axes of the first polarizing plate (41) and the second polarizing plate (42) are perpendicular to each other; The display panel has a plurality of pixel units (P), each pixel unit (P) comprises a transmission area (T) and a reflection area (R), the array substrate (20) is provided with a first pixel electrode (23), a second pixel electrode (25) and a metal wire grid polarizer (24) formed by a plurality of metal wire grids on a side facing the liquid crystal layer (30), the first pixel electrode (23) corresponds to the transmission area (T), the metal wire grid polarizer (24) and the second pixel electrode (25) both correspond to the reflection area (R), and the light transmission axis of the metal wire grid polarizer (24) is parallel to the light transmission axis of the first polarizer (41); A first common electrode (14) is provided on the color film substrate (10); the orientation direction of the liquid crystal layer (30) on the side close to the color film substrate (10) is parallel to the light transmission axis of the first polarizer (41); the orientation direction of the liquid crystal layer (30) on the side close to the array substrate (20) is parallel to the light transmission axis of the second polarizer (42); and the metal wire grid polarizer (24) is reused as the second pixel electrode (25); in the transmission mode, the backlight module is turned on to direct light to the first pixel electrode (23 ) applies a corresponding grayscale voltage signal, the transmission area (T) is turned on, a dark-state voltage signal is applied to the second pixel electrode (25), the positive liquid crystal molecules corresponding to the reflection area (R) are deflected in the vertical direction and take a standing posture, and the reflection area (R) is turned off; in the reflection mode, the backlight module is turned off, the transmission area (T) is turned off, a bright-state voltage signal is applied to the second pixel electrode (25), the positive liquid crystal molecules corresponding to the reflection area (R) maintain the initial twisted 90° state, and the reflection area (R) is turned on; Alternatively, a second common electrode (21) is provided on the array substrate (20), the alignment direction of the liquid crystal layer (30) on the side close to the color film substrate (10) is parallel to or anti-parallel to the alignment direction on the side close to the array substrate (20), the alignment direction of the liquid crystal layer (30) is parallel to the light transmission axis of the first polarizer (41) or the second polarizer (42), the second pixel electrode (25) and the metal wire grid polarizer (24) are located in different layers and are insulated and spaced apart from each other; in the transmission mode, the backlight mode is turned on. The invention relates to a method for realizing a backlight module of the present invention, wherein the first pixel electrode (23) is provided with a corresponding grayscale voltage signal, the transmission area (T) is opened, a dark-state voltage signal is applied to the second pixel electrode (25), the negative liquid crystal molecules corresponding to the reflection area (R) are kept in an initial flat state, and the reflection area (R) is closed; in the reflection mode, the backlight module is turned off, the transmission area (T) is closed, a bright-state voltage signal is applied to the second pixel electrode (25), the negative liquid crystal molecules corresponding to the reflection area (R) are deflected in the horizontal direction, and the reflection area (R) is opened.

2. The display panel switchable between transmission and mirror according to claim 1, characterized in that: The second pixel electrode (25) and the metal wire grid polarizer (24) are located in different layers and are insulated and spaced apart from each other, and the metal wire grid polarizer (24) is in contact with the surface of the second common electrode (21).

3. The display panel switchable between transmission and mirror according to claim 1, characterized in that: The second pixel electrode (25) is a strip-shaped structure and corresponds to a row or a column of the reflective area (R); a plurality of the second pixel electrodes (25) are electrically connected to each other in the non-display area; the array substrate (20) is provided with a plurality of scan lines, a plurality of data lines and a plurality of thin film transistors on a side facing the liquid crystal layer (30); and the first pixel electrode (23) is electrically connected to the corresponding scan lines and data lines via the thin film transistors.

4. The display panel switchable between transmission and mirror according to claim 1, characterized in that: The second pixel electrodes (25) correspond to the reflective areas (R) one by one, the array substrate (20) is provided with a plurality of scan lines, a plurality of data lines and a plurality of thin film transistors on a side facing the liquid crystal layer (30), two thin film transistors are correspondingly provided in each of the pixel units (P), the first pixel electrode (23) is electrically connected to the corresponding scan line and the data line through one of the thin film transistors, and the second pixel electrode (25) is electrically connected to the corresponding scan line and the data line through another of the thin film transistors.

5. The display panel switchable between transmission and mirror according to claim 4, characterized in that: The first pixel electrode (23) and the second pixel electrode (25) are respectively connected to different scanning lines and / or data lines through two thin film transistors.

6. A display device, characterized in that: A display panel comprising a transmissive and mirror switchable display panel as claimed in any one of claims 1 to 5.

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