Transflective display switchable display panel, display device and driving method

Abstract

The application discloses a display panel switchable between transmissive and reflective display modes, a display device and a driving method. The display panel comprises a first liquid crystal box and a second liquid crystal box arranged in layers. In the reflective display mode, the backlight is turned off, and the first liquid crystal box is driven by a first gamma driving signal to perform reflective display. In the transmissive display mode, the backlight is turned on, and the first liquid crystal box is controlled to be in a light-transmitting state, and the second liquid crystal box is driven by a second gamma driving signal to perform transmissive display. The gamma driving signals of the first liquid crystal box and the second liquid crystal box are independently set, and the vcom signals are also independently set. The gamma driving signals of the first liquid crystal box and the second liquid crystal box are pre-matched and set. Only the opening or closing of the driving module power supply needs to be controlled according to the switching signal to realize the switching of the first liquid crystal box and the second liquid crystal box between the reflective display mode and the transmissive display mode, thereby avoiding compatibility problems such as flickering and residual image when the display mode is switched.

Description

Technical Field

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

[0002] LCD panels have advantages such as good image quality, small size, light weight, low driving voltage, low power consumption, no radiation, and relatively low manufacturing cost, and are widely used in electronic devices such as laptops, mobile phones, e-readers, and LCD TVs.

[0003] In recent years, with the continuous development and promotion of liquid crystal display technology, the industry has developed a type of liquid crystal display panel that can be used in any environment: the semi-reflective liquid crystal display device. The semi-reflective liquid crystal display device combines both reflective and transmissive display modes. When there is sufficient ambient light, it can operate in reflective mode; when there is insufficient ambient light, it can operate in transmissive mode by turning on the backlight. However, since there is a certain difference in grayscale brightness between reflective and transmissive modes, dual gamma driving signals are required to achieve free switching between transmissive and reflective display modes, meeting the needs of users in different usage scenarios while retaining the basic performance of the original transmissive display. To accommodate the optical path difference between transmissive and reflective modes, existing semi-reflective liquid crystal display devices with single liquid crystal cells require complex designs for the color filter substrate. For example, transparent and color resist areas need to be set, which sacrifices the aperture ratio. Moreover, the optics and image quality in transmissive mode are somewhat different from those of conventional transmissive display panels. In addition, there are compatibility issues when switching dual gamma drive signals between the same liquid crystal cell. For example, flickering may occur, and there are questions about how to set the dual gamma signals to share a common VCOM signal. It is also difficult to achieve optimal image retention in both modes. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies of the prior art, the present invention aims to provide a switchable transflective display panel, display device and driving method to solve the compatibility problems of existing semi-reflective liquid crystal display devices when switching between transflective display mode and reflective display mode, such as flickering, sharing a single VCOM signal and severe image retention.

[0005] The objective of this invention is achieved through the following technical solution: The present invention provides a transflective display panel with switchable display, comprising a first liquid crystal cell and a second liquid crystal cell stacked on top of each other, wherein the first liquid crystal cell is disposed on the light-emitting side of the second liquid crystal cell; A first polarizer is provided on the side of the first liquid crystal cell away from the second liquid crystal cell, a second polarizer is provided between the first liquid crystal cell and the second liquid crystal cell, and a third polarizer is provided on the side of the second liquid crystal cell away from the first liquid crystal cell. The first polarizer is a circular polarizer, and the second polarizer and the third polarizer are both linear polarizers with their transmission axes perpendicular to each other. The first liquid crystal cell includes an opposing substrate, a first array substrate disposed opposite to the opposing substrate, and a first liquid crystal layer disposed between the opposing substrate and the first array substrate. The first array substrate is provided with a reflective metal layer, and the reflective metal layer is provided with a plurality of light-transmitting holes. The second liquid crystal cell includes a color filter substrate, a second array substrate disposed opposite to the color filter substrate, and a second liquid crystal layer located between the color filter substrate and the second array substrate; In reflective display mode, the backlight is turned off, and the first liquid crystal cell is driven by the first gamma driving signal to perform reflective display; in transmissive display mode, the backlight is turned on and the first liquid crystal cell is controlled to be in a light-transmitting state, and the second liquid crystal cell is driven by the second gamma driving signal to perform transmissive display.

[0006] Furthermore, the first array substrate is provided with first pixel electrodes arranged in an array, and the reflective metal layer includes the first pixel electrodes.

[0007] Furthermore, the circular polarizer includes a linear polarizer and a quarter-wave plate. The linear polarizer of the circular polarizer is disposed on the side of the quarter-wave plate closer to the external environment, and the transmission axis of the linear polarizer is at 45° to the fast and slow axes of the quarter-wave plate.

[0008] This application also provides a transflective display switchable display panel, including a first liquid crystal cell and a second liquid crystal cell stacked on top of each other, wherein the first liquid crystal cell is disposed on the light-emitting side of the second liquid crystal cell; A first polarizer is provided on the side of the first liquid crystal cell away from the second liquid crystal cell, a second polarizer is provided between the first liquid crystal cell and the second liquid crystal cell, and a third polarizer is provided on the side of the second liquid crystal cell away from the first liquid crystal cell. The first polarizer, the second polarizer, and the third polarizer are all linear polarizers. The second polarizer is an APF polarizer. The transmission axes of the first polarizer and the third polarizer are parallel to each other and both are perpendicular to the transmission axis of the second polarizer. The first liquid crystal cell includes an opposing substrate, a first array substrate disposed opposite to the opposing substrate, and a first liquid crystal layer disposed between the opposing substrate and the first array substrate; The second liquid crystal cell includes a color filter substrate, a second array substrate disposed opposite to the color filter substrate, and a second liquid crystal layer located between the color filter substrate and the second array substrate; In reflective display mode, the backlight is turned off, and the first liquid crystal cell is driven by the first gamma driving signal to perform reflective display; in transmissive display mode, the backlight is turned on and the first liquid crystal cell is controlled to be in a light-transmitting state, and the second liquid crystal cell is driven by the second gamma driving signal to perform transmissive display.

[0009] Furthermore, the first array substrate is provided with first pixel electrodes arranged in an array, and the opposing substrate is provided with a first common electrode that cooperates with the first pixel electrodes. The liquid crystal molecules in the first liquid crystal layer are positive liquid crystal molecules. In the initial state, the positive liquid crystal molecules are in a flat position. The positive liquid crystal molecules near the opposing substrate are perpendicularly aligned with the positive liquid crystal molecules near the first array substrate. The positive liquid crystal molecules in the first liquid crystal layer are twisted 90° from top to bottom.

[0010] Furthermore, the second array substrate is provided with second pixel electrodes arranged in an array, and the color filter substrate is provided with a second common electrode that cooperates with the second pixel electrodes; The liquid crystal molecules in the second liquid crystal layer are positive liquid crystal molecules. In the initial state, the positive liquid crystal molecules are in a flat position. The positive liquid crystal molecules near the color filter substrate and the positive liquid crystal molecules near the second array substrate are perpendicularly aligned to each other. The positive liquid crystal molecules in the second liquid crystal layer are twisted 90° from top to bottom.

[0011] Furthermore, the second array substrate is provided with second pixel electrodes arranged in an array and a second common electrode that cooperates with the second pixel electrodes. The liquid crystal molecules in the second liquid crystal layer are positive liquid crystal molecules. In the initial state, the positive liquid crystal molecules are in a flat position, and the positive liquid crystal molecules near the color filter substrate are parallel to each other.

[0012] Furthermore, the opposing substrate is provided with a plurality of transparent areas arranged in an array and a first black matrix that separates the plurality of transparent areas from each other; The color filter substrate has multiple color resist layers arranged in an array and a second black matrix that separates the multiple color resist layers from each other. The transparent area corresponds one-to-one with the color resist layer.

[0013] This application also provides a display device with a switchable transflective display, including a backlight module and a switchable transflective display panel as described above, wherein the backlight module is used to provide a backlight to the display panel in transflective display mode.

[0014] This application also provides a driving method for a display panel, used to drive a transflective display switchable display panel as described above, the driving method comprising: When a signal to switch the reflective display mode is received, the backlight is turned off, a first gamma driving signal is input to the first liquid crystal cell, and it is driven to perform reflective display. When a signal to switch the transmission display mode is received, the backlight is turned on and the first liquid crystal cell is controlled to be in a light-transmitting state. A second gamma driving signal is input to the second liquid crystal cell and it is driven to perform transmission display.

[0015] The beneficial effects of this invention are as follows: by independently setting the gamma drive signal for the first liquid crystal cell and the second liquid crystal cell, and the vcom signal is also independent, that is, the gamma drive signals of the first liquid crystal cell and the second liquid crystal cell are pre-matched and set. It is only necessary to control the power supply of the drive module to turn on or off according to the switching signal to realize the switching between the first liquid crystal cell and the second liquid crystal cell in reflective display mode and transmissive display mode. This avoids compatibility problems such as flickering and afterimage when switching display modes, which is beneficial for debugging and also helps each mode achieve the best effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the display panel in its initial state according to Embodiment 1 of the present invention.

[0017] Figure 2 This is a schematic diagram of the planar structure of the first array substrate in Embodiment 1 of the present invention.

[0018] Figure 3 This is a schematic diagram of the planar structure of the second array substrate in Embodiment 1 of the present invention.

[0019] Figure 4 This is a signal diagram of the driving method for the display panel in Embodiment 1 of the present invention.

[0020] Figure 5 This is a schematic diagram of the display panel in the reflective display mode in the bright state according to Embodiment 1 of the present invention.

[0021] Figure 6 This is a schematic diagram illustrating the principle of the display panel in the reflective display mode in the bright state according to Embodiment 1 of the present invention.

[0022] Figure 7 This is a schematic diagram of the display panel in the dark state of the reflective display mode in Embodiment 1 of the present invention.

[0023] Figure 8 This is a schematic diagram illustrating the principle of the display panel in the dark state of the reflective display mode in Embodiment 1 of the present invention.

[0024] Figure 9 This is a schematic diagram of the display panel in the bright state of the transmissive display mode in Embodiment 1 of the present invention.

[0025] Figure 10 This is a schematic diagram illustrating the principle of the display panel in the bright state of the transmissive display mode in Embodiment 1 of the present invention.

[0026] Figure 11 This is a schematic diagram of the structure of the display panel in the dark state of the transmissive display mode in Embodiment 1 of the present invention.

[0027] Figure 12 This is a schematic diagram illustrating the principle of the display panel in the dark state of the transmissive display mode in Embodiment 1 of the present invention.

[0028] Figure 13 This is a VT curve diagram of the display panel in reflective display mode and transmissive display mode in Embodiment 1 of the present invention.

[0029] Figure 14 This is a schematic diagram of the display panel in its initial state in Embodiment 2 of the present invention.

[0030] Figure 15 This is a schematic diagram of the structure of the second polarizer in Embodiment 2 of the present invention.

[0031] Figure 16 This is a schematic diagram of the display panel in the dark state of the reflective display mode in Embodiment 2 of the present invention.

[0032] Figure 17 This is a schematic diagram illustrating the principle of the display panel in the dark state of the reflective display mode in Embodiment 2 of the present invention.

[0033] Figure 18 This is a schematic diagram of the display panel in the reflective display mode in the bright state according to Embodiment 2 of the present invention.

[0034] Figure 19 This is a schematic diagram illustrating the principle of the display panel in the reflective display mode in the bright state according to Embodiment 2 of the present invention.

[0035] Figure 20 This is a schematic diagram of the display panel in the bright state of the transmissive display mode in Embodiment 2 of the present invention.

[0036] Figure 21 This is a schematic diagram illustrating the principle of the display panel in the bright state of the transmissive display mode in Embodiment 2 of the present invention.

[0037] Figure 22This is a schematic diagram of the structure of the display panel in the dark state of the transmissive display mode in Embodiment 2 of the present invention.

[0038] Figure 23 This is a schematic diagram illustrating the principle of the display panel in the dark state of the transmissive display mode in Embodiment 2 of the present invention.

[0039] Figure 24 This is a VT curve diagram of the display panel in reflective display mode and transmissive display mode in Embodiment 2 of the present invention.

[0040] Figure 25 This is a schematic diagram of the display panel in its initial state according to Embodiment 3 of the present invention.

[0041] Figure 26 This is a VT curve diagram of the display panel in reflective display mode and transmissive display mode in Embodiment 3 of the present invention. Detailed Implementation

[0042] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation methods, structures, features, and effects of the switchable transflective display panel, display device, and driving method proposed according to the present invention: [Example 1] 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 first array substrate in Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the planar structure of the second array substrate in Embodiment 1 of the present invention.

[0043] like Figures 1 to 3 As shown in Embodiment 1 of the present invention, a switchable transmissive display panel includes a first liquid crystal cell 10 and a second liquid crystal cell 20 stacked on top of each other. The first liquid crystal cell 10 is located on the light-emitting side of the second liquid crystal cell 20, that is, the first liquid crystal cell 10 is located on the side of the second liquid crystal cell 20 closer to the external environment. The first liquid crystal cell 10 and the second liquid crystal cell 20 can be bonded together using OCA adhesive with a hazy finish, thereby improving the transmissive display effect. The first liquid crystal cell 10 has a plurality of first pixel units P1 arranged in an array, and the second liquid crystal cell 20 has a plurality of second pixel units P2 arranged in an array. Preferably, the first pixel unit P1 and the second pixel unit P2 correspond one-to-one. Of course, in other embodiments, one first pixel unit P1 can also correspond to multiple second pixel units P2, or one second pixel unit P2 can also correspond to multiple first pixel units P1.

[0044] In reflective display mode, the backlight is turned off, and the first liquid crystal cell 10 is driven by the first gamma driving signal to perform reflective display; in transmissive display mode, the backlight is turned on and the first liquid crystal cell 10 is controlled to be in a light-transmitting state, and the second liquid crystal cell 20 is driven by the second gamma driving signal to perform transmissive display.

[0045] A first polarizer 31 is provided on the side of the first liquid crystal cell 10 away from the second liquid crystal cell 20. A second polarizer 32 is provided between the first liquid crystal cell 10 and the second liquid crystal cell 20. A third polarizer 33 is provided on the side of the second liquid crystal cell 20 away from the first liquid crystal cell 10. The first polarizer 31 is a circular polarizer, meaning it can convert ambient light into circularly polarized light. Preferably, the circular polarizer can be a hazy circular polarizer, which has a certain scattering effect on light to improve the display effect. The second polarizer 32 and the third polarizer 33 are both linear polarizers with their transmission axes perpendicular to each other. The second polarizer 32 and the third polarizer 33 can be brightness-enhancing polarizers to improve the brightness of the transmitted display. In this embodiment, the circular polarizer includes a linear polarizer and a quarter-wave plate. The linear polarizer of the circular polarizer is located on the side of the quarter-wave plate closer to the external environment, and the transmission axis of the linear polarizer is at a 45° angle to the fast and slow axes of the quarter-wave plate. Optionally, the transmission axis of the center polarizer in the circular polarizer can be perpendicular to the transmission axis of the second polarizer 32.

[0046] The first liquid crystal cell 10 includes an opposing substrate 11, a first array substrate 12 disposed opposite to the opposing substrate 11, and a first liquid crystal layer 13 disposed between the opposing substrate 11 and the first array substrate 12. The first array substrate 12 has a reflective metal layer, and the reflective metal layer has a plurality of light-transmitting holes 121a. Figure 2 This allows the reflective metal layer to both reflect ambient light and transmit backlight. The shape of the light-transmitting hole 121a can be circular or polygonal, and the aperture ratio of the reflective metal layer is preferably 50%. Multiple light-transmitting holes 121a are evenly distributed on the reflective metal layer to achieve both reflective and transmissive display effects.

[0047] In this embodiment, the first array substrate 12 is provided with first pixel electrodes 121 arranged in an array, and the first pixel electrodes 121 are block structures corresponding one-to-one with the first pixel units P1. The reflective metal layer includes the first pixel electrodes 121, that is, the first pixel electrodes 121 are made of reflective metal material to reduce cell thickness and manufacturing cost. The opposing substrate 11 is provided with a first common electrode 112 on the side facing the first liquid crystal layer 13, which cooperates with the first pixel electrodes 121. The first common electrode 112 is a planar structure covering the opposing substrate 11.

[0048] The liquid crystal molecules in the first liquid crystal layer 13 are positive liquid crystal molecules (liquid crystal molecules with positive dielectric anisotropy), such as Figure 1 As shown, in the initial state, the positive liquid crystal molecules are in a flat position. The positive liquid crystal molecules near the opposing substrate 11 are perpendicularly aligned with the positive liquid crystal molecules near the first array substrate 12. The positive liquid crystal molecules in the first liquid crystal layer 13 are twisted 90° from top to bottom. That is, the first liquid crystal cell 10 adopts a TN display mode to achieve a normally white display mode, which can reduce driving power consumption. The phase delay of the first liquid crystal layer 13 in the initial state can be controlled to be λ / 4 by controlling the thickness of the first liquid crystal layer 13.

[0049] In this embodiment, the opposing substrate 11 has a plurality of transparent areas arranged in an array and a first black matrix 111 that separates the plurality of transparent areas from each other. The transparent areas correspond one-to-one with the first pixel units P1. That is, the opposing substrate 11 does not need to set a color resist in the area corresponding to the first pixel unit P1, and can use a planarization layer to fill it, so that a black and white image can be displayed in the reflective display mode, realizing the e-book reading mode. Of course, the opposing substrate 11 may also omit the first black matrix 111 to reduce manufacturing costs.

[0050] like Figure 2 As shown, the first array substrate 12 has multiple first scan lines 101, multiple first data lines 102, and multiple first thin-film transistors 103 on the side facing the first liquid crystal layer 13. The multiple first scan lines 101 and multiple first data lines 102 are mutually insulated and intersecting to form multiple first pixel units P1. The first pixel electrode 121 is electrically connected to the first scan line 101 and the first data line 102 adjacent to the first thin-film transistor 103 through the corresponding first thin-film transistor 103. The first thin-film transistor 103 includes a first gate, a first active layer, a first drain, and a first source. The first gate and the first scan line 101 are located on the same layer and are electrically connected. The first gate and the first active layer are isolated by an insulating layer. The first source is electrically connected to the first data line 102. The first drain is electrically connected to the first pixel electrode 121 through a contact hole.

[0051] The second liquid crystal cell 20 includes a color filter substrate 21, a second array substrate 22 disposed opposite to the color filter substrate 21, and a second liquid crystal layer 23 located between the color filter substrate 21 and the second array substrate 22. In this embodiment, the second liquid crystal layer 23 uses positive liquid crystal molecules, that is, liquid crystal molecules with positive dielectric anisotropy. Figure 1 As shown, in the initial state, the positive liquid crystal molecules are in a flat position. The positive liquid crystal molecules near the color filter substrate 21 and the positive liquid crystal molecules near the second array substrate 22 are perpendicularly aligned to each other. The positive liquid crystal molecules in the second liquid crystal layer 23 are twisted 90° from top to bottom. That is, the second liquid crystal cell 20 also adopts the TN display mode to achieve the normal white display mode, which can reduce driving power consumption.

[0052] The second array substrate 22 is provided with second pixel electrodes 221 arranged in an array, and the second pixel electrodes 221 are block structures corresponding one-to-one with the second pixel units P2. The color filter substrate 21 is provided with a second common electrode 213 that cooperates with the second pixel electrodes 221, and the second common electrode 213 is a planar structure covering the color filter substrate 21.

[0053] The color filter substrate 21 has color resist layers 212 arranged in an array and a second black matrix 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 projection of the first black matrix 111 onto the color filter substrate 21 coincides with the second black matrix 211.

[0054] like Figure 3 As shown, the second array substrate 22 has multiple second scan lines 201 and multiple second data lines 202 on the side facing the second liquid crystal layer 23. The multiple second scan lines 201 and multiple second data lines 202 are mutually insulated and intersecting to form multiple second pixel units P2. The second array substrate 22 has a second thin film transistor 203 and a second pixel electrode 221 in each second pixel unit P2. The second pixel electrode 221 is electrically connected to the second scan line 201 and the second data line 202 adjacent to the second thin film transistor 203 through the second thin film transistor 203. The second thin film transistor 203 includes a second gate, a second active layer, a second drain, and a second source. The second gate and the second scan line 201 are located on the same layer and are electrically connected. The second gate and the second active layer are isolated by an insulating layer. The second source is electrically connected to the second data line 202. The second drain is electrically connected to the second pixel electrode 221 through a contact hole.

[0055] The opposing substrate 11, the first array substrate 12, the color filter substrate 21, and the second array substrate 22 can be made of materials such as glass, acrylic, and polycarbonate. The first common electrode 112, the second common electrode 213, and the second pixel electrode 221 can be made of materials such as indium tin oxide (ITO) or indium zinc oxide (IZO). The first pixel electrode 121 can be made of a metal with high reflectivity, such as aluminum or silver.

[0056] This application also provides a display device with a switchable transflective display, including a backlight module 40 and a switchable transflective display panel as described above. The display panel is disposed on the light-emitting side of the backlight module 40, and the backlight module 40 is used to provide a backlight to the display panel in the transflective display mode.

[0057] Figure 4 This is a signal diagram of the driving method for the display panel in Embodiment 1 of the present invention. For example... Figure 4As shown, this application also provides a driving method for a display panel, used to drive a transflective display switchable display panel as described above. The driving method includes: When a signal to switch to reflective display mode is received, the backlight is turned off, a first gamma drive signal is input to the first liquid crystal cell 10, and it is driven to perform reflective display. In reflective display mode, neither the backlight module 40 nor the second liquid crystal cell 20 requires any drive signal.

[0058] When a signal to switch to transmissive display mode is received, the backlight is turned on and the first liquid crystal cell 10 is controlled to be in a light-transmitting state. A second gamma driving signal is input to the second liquid crystal cell 20, driving it to perform transmissive display. In transmissive display mode, the first liquid crystal cell 10 does not require any driving signal.

[0059] Figure 5 This is a schematic diagram of the display panel in the reflective display mode in the bright state according to Embodiment 1 of the present invention. Figure 6 This is a schematic diagram illustrating the principle of the display panel in the reflective display mode in the bright state according to Embodiment 1 of the present invention. Figure 5 and Figure 6 As shown, in the bright state of the reflective display mode, a first common signal is applied to the first common electrode 112, and a bright grayscale signal is applied to the first pixel electrode 121. There is essentially no perpendicular electric field between the first common electrode 112 and the first pixel electrode 121. The positive liquid crystal molecules in the first liquid crystal layer 13 maintain their initial 90° twisted state. At this time, the first liquid crystal layer 13 has a phase retardation of λ / 4. Ambient light enters the first liquid crystal cell 10 and is reflected back by the first pixel electrode 121, achieving the bright state. Specifically, as... Figure 6 As shown, ambient light from the outside passes through the first polarizer (circular polarizer) 31 and becomes circularly polarized light (left-handed), then passes through the first liquid crystal layer 13 and becomes linearly polarized light. Some of the light is reflected back by the first pixel electrode 121, passes through the first liquid crystal layer 13 and becomes circularly polarized light (left-handed), and finally passes through the first polarizer 31 and becomes linearly polarized light and is emitted from the first polarizer 31, thus achieving a bright state.

[0060] Figure 7 This is a schematic diagram of the display panel in the dark state of the reflective display mode in Embodiment 1 of the present invention. Figure 8 This is a schematic diagram illustrating the principle of the display panel in the dark state of the reflective display mode in Embodiment 1 of the present invention. Figure 7 and Figure 8As shown, in the dark state of the reflective display mode, a first common signal is applied to the first common electrode 112, and a dark grayscale signal is applied to the first pixel electrode 121. A strong vertical electric field is formed between the first common electrode 112 and the first pixel electrode 121. The positive liquid crystal molecules in the first liquid crystal layer 13 are deflected vertically and perpendicular to the opposing substrate 11 and the first array substrate 12. Ambient light enters the first liquid crystal cell 10 and is reflected back by the first pixel electrode 121, and then absorbed by the first polarizer 31, thus achieving the dark state. Specifically, as shown... Figure 8 As shown, ambient light from the outside world becomes circularly polarized light (left-handed) after passing through the first polarizer (circular polarizer) 31. After passing through the first liquid crystal layer 13, it is still circularly polarized light (left-handed). Some of the light is reflected back by the first pixel electrode 121 and is still circularly polarized light (right-handed), but in the opposite direction. After passing through the first liquid crystal layer 13, it is still circularly polarized light (right-handed). Finally, it is absorbed by the first polarizer 31 to achieve the dark state.

[0061] Figure 9 This is a schematic diagram of the display panel in the bright state of the transmissive display mode in Embodiment 1 of the present invention. Figure 10 This is a schematic diagram illustrating the principle of the display panel in the bright state of the transmissive display mode in Embodiment 1 of the present invention. Figure 9 and Figure 10 In the bright state of the transmissive display mode, a second common signal is applied to the second common electrode 213, and a bright grayscale signal is applied to the second pixel electrode 221. There is essentially no perpendicular electric field between the second common electrode 213 and the second pixel electrode 221. The positive liquid crystal molecules in the second liquid crystal layer 23 maintain their initial 90° twisted state, allowing backlight to pass sequentially through the second liquid crystal cell 20 and the first liquid crystal cell 10, thus achieving the bright state. Specifically, as... Figure 10 As shown, the backlight passes through the third polarizer 33 and becomes linearly polarized light (90°). After passing through the second liquid crystal layer 23, it rotates 90° and becomes parallel to the transmission axis of the second polarizer 32. The light passes through the second polarizer 32 and then through the first liquid crystal layer 13 and becomes circularly polarized light (left-handed). Finally, it passes through the first polarizer 31 and becomes linearly polarized light and is emitted from the first polarizer 31, thus achieving the bright state.

[0062] Figure 11 This is a schematic diagram of the structure of the display panel in the dark state of the transmissive display mode in Embodiment 1 of the present invention. Figure 12 This is a schematic diagram illustrating the principle of the display panel in the dark state of the transmissive display mode in Embodiment 1 of the present invention. Figure 11 and Figure 12As shown, in the dark state of the transmissive display mode, a second common signal is applied to the second common electrode 213, and a dark grayscale signal is applied to the second pixel electrode 221. A strong vertical electric field is formed between the second common electrode 213 and the second pixel electrode 221. The positive liquid crystal molecules in the second liquid crystal layer 23 are deflected vertically and perpendicular to the color filter substrate 21 and the second array substrate 22. Backlight is absorbed by the second polarizer 32 after passing through the second liquid crystal layer 23, thus achieving the dark state. Specifically, as shown... Figure 12 As shown, the backlight light passes through the third polarizer 33 and becomes linearly polarized light (90°). After passing through the second liquid crystal layer 23, the deflection direction does not change and is perpendicular to the transmission axis of the second polarizer 32. The light is absorbed by the second polarizer 32 to achieve the dark state.

[0063] In the reflective display mode, when displaying a pattern, a corresponding grayscale signal (0-255 grayscale) is applied to the first pixel electrode 121, thereby making the corresponding first pixel unit P1 bright or dark to display a black and white image; in the transmissive display mode, a corresponding grayscale signal (0-255 grayscale) is applied to the second pixel electrode 221, thereby making the corresponding second pixel unit P2 bright or dark to display a color image.

[0064] Figure 13 This is a VT curve diagram of the display panel in reflective display mode and transmissive display mode according to Embodiment 1 of the present invention. Figure 13 As shown, since the VT curves of the reflective display mode and the transmissive display mode are different, it is necessary to adjust and match the gamma drive signal for the transmissive display mode and the reflective display mode. One version of the gamma drive signal (the first gamma drive signal) is needed to match the reflective display mode, and another version of the gamma drive signal (the second gamma drive signal) is needed to match the transmissive display mode. The two versions of gamma drive signal switch accordingly when the display mode is switched. Specifically, the brightness of the reflective display mode decreases as the voltage applied to the first pixel electrode 121 increases; the brightness of the transmissive display mode decreases as the voltage applied to the second pixel electrode 221 increases.

[0065] [Example 2] Figure 14 This is a schematic diagram of the display panel in its initial state in Embodiment 2 of the present invention. Figure 15 This is a schematic diagram of the structure of the second polarizer in Embodiment 2 of the present invention. Figure 14 and Figure 15As shown, Embodiment 2 of the present invention provides a switchable transmissive display panel, including a first liquid crystal cell 10 and a second liquid crystal cell 20 stacked on top of each other. The first liquid crystal cell 10 is located on the light-emitting side of the second liquid crystal cell 20, that is, the first liquid crystal cell 10 is located on the side of the second liquid crystal cell 20 closer to the external environment. The first liquid crystal cell 10 and the second liquid crystal cell 20 can be bonded together using OCA adhesive with a hazy finish, thereby improving the transmissive display effect. The first liquid crystal cell 10 has a plurality of first pixel units P1 arranged in an array, and the second liquid crystal cell 20 has a plurality of second pixel units P2 arranged in an array. Preferably, the first pixel unit P1 and the second pixel unit P2 correspond one-to-one. Of course, in other embodiments, one first pixel unit P1 can also correspond to multiple second pixel units P2, or one second pixel unit P2 can also correspond to multiple first pixel units P1.

[0066] In reflective display mode, the backlight is turned off, and the first liquid crystal cell 10 is driven by the first gamma driving signal to perform reflective display; in transmissive display mode, the backlight is turned on and the first liquid crystal cell 10 is controlled to be in a light-transmitting state, and the second liquid crystal cell 20 is driven by the second gamma driving signal to perform transmissive display.

[0067] A first polarizer 31 is provided on the side of the first liquid crystal cell 10 away from the second liquid crystal cell 20. A second polarizer 32 is provided between the first liquid crystal cell 10 and the second liquid crystal cell 20. A third polarizer 33 is provided on the side of the second liquid crystal cell 20 away from the first liquid crystal cell 10. The first polarizer 31, the second polarizer 32, and the third polarizer 33 are all linear polarizers. The second polarizer 32 is an APF polarizer, i.e., a reflective polarizer. The third polarizer 33 can be a brightness-enhancing polarizer to improve the brightness of the transmissive display. The transmission axes of the first polarizer 31 and the third polarizer 33 are parallel to each other and perpendicular to the transmission axis of the second polarizer 32.

[0068] like Figure 15 As shown, the APF polarizer includes a first dielectric layer (ATC1), a polarizing layer (PVA), a second dielectric layer (ATC2), an APF film (APF), and an adhesive layer (PSA) stacked sequentially. The APF film is disposed on the side of the polarizing layer facing the first liquid crystal cell 10. The polarizing layer polarizes the light, and the APF film provides a semi-transparent, semi-reflective effect. The transmission axis of the polarizing layer is parallel to the transmission axis of the APF film and perpendicular to the reflection axis of the APF film. The reflective surface of the APF film can be disposed close to the adhesive layer or close to the polarizing layer.

[0069] The first liquid crystal cell 10 includes a counter substrate 11, a first array substrate 12 disposed opposite to the counter substrate 11, and a first liquid crystal layer 13 disposed between the counter substrate 11 and the first array substrate 12. The liquid crystal molecules in the first liquid crystal layer 13 are positive liquid crystal molecules (liquid crystal molecules with positive dielectric anisotropy), such as... Figure 14 As shown, in the initial state, the positive liquid crystal molecules are in a flat position. The positive liquid crystal molecules near the opposing substrate 11 are perpendicularly aligned with the positive liquid crystal molecules near the first array substrate 12. The positive liquid crystal molecules in the first liquid crystal layer 13 are twisted 90° from top to bottom. That is, the first liquid crystal cell 10 adopts the TN display mode to achieve a normal white display mode, which can reduce driving power consumption. Since the first polarizer 31 is a linear polarizer, it is not necessary to set the phase delay of the first liquid crystal layer 13 in the initial state to λ / 4; a conventional TN mode setting is sufficient.

[0070] In this embodiment, the first array substrate 12 is provided with first pixel electrodes 121 arranged in an array, and the first pixel electrodes 121 are block structures corresponding one-to-one with the first pixel units P1. The reflective metal layer includes the first pixel electrodes 121, that is, the first pixel electrodes 121 are made of reflective metal material to reduce cell thickness and manufacturing cost. The opposing substrate 11 is provided with a first common electrode 112 on the side facing the first liquid crystal layer 13, which cooperates with the first pixel electrodes 121. The first common electrode 112 is a planar structure covering the opposing substrate 11.

[0071] In this embodiment, the opposing substrate 11 has a plurality of transparent areas arranged in an array and a first black matrix 111 that separates the plurality of transparent areas from each other. The transparent areas correspond one-to-one with the first pixel units P1. That is, the opposing substrate 11 does not need to set a color resist in the area corresponding to the first pixel unit P1, and can use a planarization layer to fill it, so that a black and white image can be displayed in the reflective display mode, realizing the e-book reading mode. Of course, the opposing substrate 11 may also omit the first black matrix 111 to reduce manufacturing costs.

[0072] refer to Figure 2As shown, the first array substrate 12 has multiple first scan lines 101, multiple first data lines 102, and multiple first thin-film transistors 103 on the side facing the first liquid crystal layer 13. The multiple first scan lines 101 and multiple first data lines 102 are mutually insulated and intersecting to form multiple first pixel units P1. The first pixel electrode 121 is electrically connected to the first scan line 101 and the first data line 102 adjacent to the first thin-film transistor 103 through the corresponding first thin-film transistor 103. The first thin-film transistor 103 includes a first gate, a first active layer, a first drain, and a first source. The first gate and the first scan line 101 are located on the same layer and are electrically connected. The first gate and the first active layer are isolated by an insulating layer. The first source is electrically connected to the first data line 102. The first drain is electrically connected to the first pixel electrode 121 through a contact hole.

[0073] The second liquid crystal cell 20 includes a color filter substrate 21, a second array substrate 22 disposed opposite to the color filter substrate 21, and a second liquid crystal layer 23 located between the color filter substrate 21 and the second array substrate 22. In this embodiment, the second liquid crystal layer 23 uses positive liquid crystal molecules, that is, liquid crystal molecules with positive dielectric anisotropy. Figure 14 As shown, in the initial state, the positive liquid crystal molecules are in a flat position. The positive liquid crystal molecules near the color filter substrate 21 and the positive liquid crystal molecules near the second array substrate 22 are perpendicularly aligned to each other. The positive liquid crystal molecules in the second liquid crystal layer 23 are twisted 90° from top to bottom. That is, the second liquid crystal cell 20 also adopts the TN display mode to achieve the normal white display mode, which can reduce driving power consumption.

[0074] The second array substrate 22 is provided with second pixel electrodes 221 arranged in an array, and the second pixel electrodes 221 are block structures corresponding one-to-one with the second pixel units P2. The color filter substrate 21 is provided with a second common electrode 213 that cooperates with the second pixel electrodes 221, and the second common electrode 213 is a planar structure covering the color filter substrate 21.

[0075] The color filter substrate 21 has color resist layers 212 arranged in an array and a second black matrix 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 projection of the first black matrix 111 onto the color filter substrate 21 coincides with the second black matrix 211.

[0076] refer to Figure 3As shown, the second array substrate 22 has multiple second scan lines 201 and multiple second data lines 202 on the side facing the second liquid crystal layer 23. The multiple second scan lines 201 and multiple second data lines 202 are mutually insulated and intersecting to form multiple second pixel units P2. The second array substrate 22 has a second thin film transistor 203 and a second pixel electrode 221 in each second pixel unit P2. The second pixel electrode 221 is electrically connected to the second scan line 201 and the second data line 202 adjacent to the second thin film transistor 203 through the second thin film transistor 203. The second thin film transistor 203 includes a second gate, a second active layer, a second drain, and a second source. The second gate and the second scan line 201 are located on the same layer and are electrically connected. The second gate and the second active layer are isolated by an insulating layer. The second source is electrically connected to the second data line 202. The second drain is electrically connected to the second pixel electrode 221 through a contact hole.

[0077] The opposing substrate 11, the first array substrate 12, the color filter substrate 21, and the second array substrate 22 can be made of materials such as glass, acrylic, and polycarbonate. The materials of the first common electrode 112, the first pixel electrode 121, the second common electrode 213, and the second pixel electrode 221 can be indium tin oxide (ITO) or indium zinc oxide (IZO), etc.

[0078] This application also provides a display device with a switchable transflective display, including a backlight module 40 and a switchable transflective display panel as described above. The display panel is disposed on the light-emitting side of the backlight module 40, and the backlight module 40 is used to provide a backlight to the display panel in the transflective display mode.

[0079] refer to Figure 4 As shown, this application also provides a driving method for a display panel, used to drive a transflective display switchable display panel as described above. The driving method includes: When a signal to switch to reflective display mode is received, the backlight is turned off, a first gamma drive signal is input to the first liquid crystal cell 10, and it is driven to perform reflective display. In reflective display mode, neither the backlight module 40 nor the second liquid crystal cell 20 requires any drive signal.

[0080] When a signal to switch to transmissive display mode is received, the backlight is turned on and the first liquid crystal cell 10 is controlled to be in a light-transmitting state. A second gamma driving signal is input to the second liquid crystal cell 20, driving it to perform transmissive display. In transmissive display mode, the first liquid crystal cell 10 does not require any driving signal.

[0081] Figure 16 This is a schematic diagram of the display panel in the dark state of the reflective display mode in Embodiment 2 of the present invention. Figure 17This is a schematic diagram illustrating the principle of the display panel in the dark state of the reflective display mode in Embodiment 2 of the present invention. Figure 16 and Figure 17 As shown, in the dark state of the reflective display mode, a first common signal is applied to the first common electrode 112, and a dark grayscale signal is applied to the first pixel electrode 121. There is essentially no perpendicular electric field between the first common electrode 112 and the first pixel electrode 121. The positive liquid crystal molecules in the first liquid crystal layer 13 maintain their initial 90° twisted state. Ambient light can pass through the first liquid crystal cell 10 and the second liquid crystal cell 20 sequentially, and the light cannot be reflected back, thus achieving the dark state. Specifically, as... Figure 17 As shown, ambient light from the outside world passes through the first polarizer 31 and becomes linearly polarized light (90 degrees). After passing through the first liquid crystal layer 13, it rotates 90 degrees and passes through the second polarizer 32. After passing through the second liquid crystal layer 23, it rotates 90 degrees and passes through the third polarizer 33. The light cannot be reflected back, thus achieving a dark state.

[0082] Figure 18 This is a schematic diagram of the display panel in the reflective display mode in the bright state according to Embodiment 2 of the present invention. Figure 19 This is a schematic diagram illustrating the principle of the display panel in the reflective display mode in the bright state according to Embodiment 2 of the present invention. Figure 18 and Figure 19 As shown, in the bright state of the reflective display mode, a first common signal is applied to the first common electrode 112, and a bright grayscale signal is applied to the first pixel electrode 121. A strong vertical electric field is formed between the first common electrode 112 and the first pixel electrode 121. The positive liquid crystal molecules in the first liquid crystal layer 13 are deflected vertically and perpendicular to the opposing substrate 11 and the first array substrate 12. Ambient light enters the first liquid crystal cell 10 and is reflected back by the second polarizer 32, thus achieving the bright state. Specifically, as shown... Figure 19 As shown, ambient light from the outside world becomes linearly polarized light (90°) after passing through the first polarizer 31, and then remains linearly polarized light (90°) after passing through the first liquid crystal layer 13 and is reflected back by the second polarizer 32. Then it passes through the first liquid crystal layer 13 and the first polarizer 31 in sequence to achieve a bright state.

[0083] Figure 20 This is a schematic diagram of the display panel in the bright state of the transmissive display mode in Embodiment 2 of the present invention. Figure 21 This is a schematic diagram illustrating the principle of the display panel in the bright state of the transmissive display mode in Embodiment 2 of the present invention. Figure 20 and Figure 21In the bright state of the transmissive display mode, a second common signal is applied to the second common electrode 213, and a bright grayscale signal is applied to the second pixel electrode 221. There is essentially no perpendicular electric field between the second common electrode 213 and the second pixel electrode 221. The positive liquid crystal molecules in the second liquid crystal layer 23 maintain their initial 90° twisted state, allowing backlight to pass sequentially through the second liquid crystal cell 20 and the first liquid crystal cell 10, thus achieving the bright state. Specifically, as... Figure 21 As shown, the backlight passes through the third polarizer 33 and becomes linearly polarized light (90°). After passing through the second liquid crystal layer 23, it rotates 90° and becomes parallel to the light transmission axis of the second polarizer 32. The light passes through the second polarizer 32, passes through the first liquid crystal layer 13, rotates 90°, and is emitted from the first polarizer 31, thus achieving a bright state.

[0084] Figure 22 This is a schematic diagram of the structure of the display panel in the dark state of the transmissive display mode in Embodiment 2 of the present invention. Figure 23 This is a schematic diagram illustrating the principle of the display panel in the dark state of the transmissive display mode in Embodiment 2 of the present invention. Figure 22 and Figure 23 As shown, in the dark state of the transmissive display mode, a second common signal is applied to the second common electrode 213, and a dark grayscale signal is applied to the second pixel electrode 221. A strong vertical electric field is formed between the second common electrode 213 and the second pixel electrode 221. The positive liquid crystal molecules in the second liquid crystal layer 23 are deflected vertically and perpendicular to the color filter substrate 21 and the second array substrate 22. Backlight is absorbed by the second polarizer 32 after passing through the second liquid crystal layer 23, thus achieving the dark state. Specifically, as shown... Figure 23 As shown, the backlight light passes through the third polarizer 33 and becomes linearly polarized light (90°). After passing through the second liquid crystal layer 23, the deflection direction does not change and is perpendicular to the transmission axis of the second polarizer 32. The light is absorbed by the second polarizer 32 to achieve the dark state.

[0085] In the reflective display mode, when displaying a pattern, a corresponding grayscale signal (0-255 grayscale) is applied to the first pixel electrode 121, thereby making the corresponding first pixel unit P1 bright or dark to display a black and white image; in the transmissive display mode, a corresponding grayscale signal (0-255 grayscale) is applied to the second pixel electrode 221, thereby making the corresponding second pixel unit P2 bright or dark to display a color image.

[0086] Figure 24 This is a VT curve diagram of the display panel in reflective display mode and transmissive display mode in Embodiment 2 of the present invention. Figure 24As shown, since the VT curves of the reflective display mode and the transmissive display mode are different, it is necessary to adjust and match the gamma drive signal for each mode. One version of the gamma drive signal (the first gamma drive signal) is needed for the reflective display mode, and another version (the second gamma drive signal) is needed for the transmissive display mode. The two versions of gamma drive signal switch accordingly when the display mode is switched. Specifically, the brightness of the reflective display mode increases as the voltage applied to the first pixel electrode 121 increases; the brightness of the transmissive display mode decreases as the voltage applied to the second pixel electrode 221 increases.

[0087] [Example 3] Figure 25 This is a schematic diagram of the display panel in its initial state according to Embodiment 3 of the present invention. Figure 25 As shown, the transflective display switchable display panel, display device, and driving method provided in Embodiment 3 of the present invention are similar to those in Embodiment 1. Figures 1 to 13 Example 2 Figures 14 to 24 The switchable display panel, display device, and driving method of the transflective display in the original text are basically the same, the difference being: In this embodiment, the second array substrate 22 is provided with second pixel electrodes 221 arranged in an array and second common electrodes 213 cooperating with the second pixel electrodes 221. The second common electrode 213 and the second pixel electrodes 221 are located on different layers and are insulated and isolated by an insulating layer. The second common electrode 213 may be located above or below the second pixel electrodes 221. Figure 25 The diagram shows the second common electrode 213 located below the second pixel electrode 221. Preferably, the second common electrode 213 is a planar electrode with its entire surface disposed, and the second pixel electrode 221 is a slit electrode with multiple electrode strips within each second pixel unit P2 to form a fringe field switching (FFS) mode. Of course, in other embodiments, the second pixel electrode 221 and the second common electrode 213 may be located on the same layer, but they are insulated from each other. Each of the second pixel electrode 221 and the second common electrode 213 may include multiple electrode strips, and the electrode strips of the second pixel electrode 221 and the second common electrode 213 are arranged alternately to form an in-plane switching (IPS) mode.

[0088] The liquid crystal molecules in the second liquid crystal layer 23 are positive liquid crystal molecules, that is, liquid crystal molecules with positive dielectric anisotropy. For example... Figure 25As shown, in the initial state, the positive liquid crystal molecules in the second liquid crystal layer 23 are aligned parallel to the color filter substrate 21 and the second array substrate 22. The alignment directions of the positive liquid crystal molecules on the side closer to the color filter substrate 21 and the positive liquid crystal molecules on the side closer to the second array substrate 22 are parallel or antiparallel.

[0089] Figure 26 This is a VT curve diagram of the display panel in reflective display mode and transmissive display mode according to Embodiment 3 of the present invention. Figure 26 As shown, since the VT curves of the reflective display mode and the transmissive display mode are different, it is necessary to adjust and match the gamma drive signal for each mode. One version of the gamma drive signal (the first gamma drive signal) is needed for the reflective display mode, and another version (the second gamma drive signal) is needed for the transmissive display mode. The two versions of gamma drive signal switch accordingly when the display mode is switched. Specifically, the brightness of the reflective display mode increases as the voltage applied to the first pixel electrode 121 increases; the brightness of the transmissive display mode increases as the voltage applied to the second pixel electrode 221 increases.

[0090] 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 Embodiment 2, and will not be repeated here.

[0091] 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.

[0092] 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 switchable transflective display panel, characterized in that, It includes a first liquid crystal cell (10) and a second liquid crystal cell (20) stacked on top of each other, wherein the first liquid crystal cell (10) is disposed on the light-emitting side of the second liquid crystal cell (20); A first polarizer (31) is provided on the side of the first liquid crystal cell (10) away from the second liquid crystal cell (20), a second polarizer (32) is provided between the first liquid crystal cell (10) and the second liquid crystal cell (20), and a third polarizer (33) is provided on the side of the second liquid crystal cell (20) away from the first liquid crystal cell (10). The first polarizer (31) is a circular polarizer, and the second polarizer (32) and the third polarizer (33) are both linear polarizers and their transmission axes are perpendicular to each other. The first liquid crystal cell (10) includes an opposing substrate (11), a first array substrate (12) disposed opposite to the opposing substrate (11), and a first liquid crystal layer (13) disposed between the opposing substrate (11) and the first array substrate (12). The first array substrate (12) is provided with a reflective metal layer, and the reflective metal layer is provided with a plurality of light-transmitting holes (121a). The second liquid crystal cell (20) includes a color filter substrate (21), a second array substrate (22) disposed opposite to the color filter substrate (21), and a second liquid crystal layer (23) located between the color filter substrate (21) and the second array substrate (22); In reflective display mode, the backlight is turned off, and the first liquid crystal cell (10) is driven by the first gamma driving signal to perform reflective display; in transmissive display mode, the backlight is turned on and the first liquid crystal cell (10) is controlled to be in a light-transmitting state, and the second liquid crystal cell (20) is driven by the second gamma driving signal to perform transmissive display.

2. The switchable transflective display panel according to claim 1, characterized in that, The first array substrate (12) is provided with first pixel electrodes (121) arranged in an array, and the reflective metal layer includes the first pixel electrodes (121).

3. The switchable transflective display panel according to claim 1, characterized in that, The circular polarizer includes a linear polarizer and a quarter-wave plate. The linear polarizer of the circular polarizer is located on the side of the quarter-wave plate closer to the external environment, and the transmission axis of the linear polarizer is at a 45° angle to the fast and slow axes of the quarter-wave plate.

4. A switchable transflective display panel, characterized in that, It includes a first liquid crystal cell (10) and a second liquid crystal cell (20) stacked on top of each other, wherein the first liquid crystal cell (10) is disposed on the light-emitting side of the second liquid crystal cell (20); A first polarizer (31) is provided on the side of the first liquid crystal cell (10) away from the second liquid crystal cell (20). A second polarizer (32) is provided between the first liquid crystal cell (10) and the second liquid crystal cell (20). A third polarizer (33) is provided on the side of the second liquid crystal cell (20) away from the first liquid crystal cell (10). The first polarizer (31), the second polarizer (32) and the third polarizer (33) are all linear polarizers. The second polarizer (32) is an APF polarizer. The light transmission axis of the first polarizer (31) and the light transmission axis of the third polarizer (33) are parallel to each other and both are perpendicular to the light transmission axis of the second polarizer (32). The first liquid crystal cell (10) includes an opposing substrate (11), a first array substrate (12) disposed opposite to the opposing substrate (11), and a first liquid crystal layer (13) disposed between the opposing substrate (11) and the first array substrate (12); The second liquid crystal cell (20) includes a color filter substrate (21), a second array substrate (22) disposed opposite to the color filter substrate (21), and a second liquid crystal layer (23) located between the color filter substrate (21) and the second array substrate (22); In reflective display mode, the backlight is turned off, and the first liquid crystal cell (10) is driven by the first gamma driving signal to perform reflective display; in transmissive display mode, the backlight is turned on and the first liquid crystal cell (10) is controlled to be in a light-transmitting state, and the second liquid crystal cell (20) is driven by the second gamma driving signal to perform transmissive display.

5. The transflective display switchable display panel according to claim 1 or 4, characterized in that, The first array substrate (12) is provided with first pixel electrodes (121) arranged in an array, and the opposing substrate (11) is provided with a first common electrode (112) that cooperates with the first pixel electrodes (121). The liquid crystal molecules in the first liquid crystal layer (13) are positive liquid crystal molecules. In the initial state, the positive liquid crystal molecules are in a flat position. The positive liquid crystal molecules near the opposing substrate (11) and the positive liquid crystal molecules near the first array substrate (12) are perpendicularly aligned to each other. The positive liquid crystal molecules in the first liquid crystal layer (13) are twisted 90° from top to bottom.

6. The transflective display switchable display panel according to claim 1 or 4, characterized in that, The second array substrate (22) is provided with second pixel electrodes (221) arranged in an array, and the color filter substrate (21) is provided with a second common electrode (213) that cooperates with the second pixel electrodes (221); The liquid crystal molecules in the second liquid crystal layer (23) are positive liquid crystal molecules. In the initial state, the positive liquid crystal molecules are in a flat position. The positive liquid crystal molecules near the color filter substrate (21) and the positive liquid crystal molecules near the second array substrate (22) are perpendicularly aligned to each other. The positive liquid crystal molecules in the second liquid crystal layer (23) are twisted 90° from top to bottom.

7. The transflective display switchable display panel according to claim 1 or 4, characterized in that, The second array substrate (22) is provided with second pixel electrodes (221) arranged in an array and second common electrodes (213) cooperating with the second pixel electrodes (221); The liquid crystal molecules in the second liquid crystal layer (23) are positive liquid crystal molecules. In the initial state, the positive liquid crystal molecules are in a flat position, and the positive liquid crystal molecules near the color filter substrate (21) are parallel to each other with the positive liquid crystal molecules near the second array substrate (22).

8. The transflective display switchable display panel according to claim 1 or 4, characterized in that, The opposing substrate (11) has a plurality of transparent areas arranged in an array and a first black matrix (111) that separates the plurality of transparent areas from each other; The color filter substrate (21) is provided with a plurality of color resist layers (212) arranged in an array and a second black matrix (211) that separates the plurality of color resist layers (212) from each other, and the transparent area corresponds one-to-one with the color resist layer (212).

9. A switchable transflective display device, characterized in that, Includes a backlight module (40) and a transmissive display switchable display panel as described in any one of claims 1-8, wherein the backlight module (40) is used to provide a backlight source to the display panel in transmissive display mode.

10. A driving method for a display panel, characterized in that, The driving method for driving a transflective display switchable display panel as described in any one of claims 1-8 includes: When a signal to switch the reflective display mode is received, the backlight is turned off, a first gamma driving signal is input to the first liquid crystal cell (10), and it is driven to perform reflective display. When a signal to switch the transmission display mode is received, the backlight is turned on and the first liquid crystal cell (10) is controlled to be in a light-transmitting state. The second gamma driving signal is input to the second liquid crystal cell (20) and it is driven to perform transmission display.

Images