Transmission and reflection switchable display device

Abstract

The utility model discloses a display device capable of switching transmission and reflection. The display device comprises a self-luminous display panel, a quarter-wave plate and a liquid crystal display panel which are sequentially arranged, the liquid crystal display panel comprises an opposed substrate, an array substrate and a liquid crystal layer, first-color bistable liquid crystal molecules and first-color dye liquid crystal molecules are arranged in the liquid crystal layer, a metal wire grid polaroid and a plurality of pixel electrodes are arranged on the array substrate, a 45-degree angle is formed between the light-transmitting axis of the metal wire grid polaroid and the fast and slow axis of a quarter-wave plate, and a 45-degree angle is formed between the light-transmitting axis of the metal wire grid polaroid and the fast and slow axis of the quarter-wave plate. A common electrode matched with the pixel electrode is arranged on the opposite substrate; the liquid crystal display panel is provided with a plurality of first pixel units, the first pixel units are provided with first color pixel units, the opposite substrate is provided with an electrochromic layer and a color changing driving electrode in the area corresponding to the first color pixel units, and the electrochromic layer can be switched between a black state and a transparent state. Switching between transmission and reflection can be realized, and the self-luminous display panel is prevented from reflecting ambient light.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a display device that can switch between transmission and reflection. Background Technology

[0002] With the development of the information age, the application of display screens has become increasingly widespread and diversified, and various display technologies have also flourished. Self-emissive displays are the next generation of displays after LCD (liquid crystal display). They have the advantages of good picture quality, small size, light weight, low driving voltage, low power consumption, no radiation, and relatively low manufacturing cost. Their development and application are becoming increasingly widespread. Examples of self-emissive displays include OLED (Organic Light-Emitting Diode) displays and Micro LED (Micro Light Emitting Diode) displays.

[0003] Self-emissive displays (SEMs) emit light by driving organic light-emitting materials with voltage, regardless of whether the environment is bright or dark. This results in higher power consumption for SEMs. Furthermore, when natural light shines on a SEM, it is reflected back by metal electrodes (such as the cathode) after passing through the encapsulation layer. The reflected light from the metal electrodes reduces the display contrast and affects the display quality. Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a display device that can switch between transmission and reflection, so as to solve the problems of high power consumption and low contrast in bright environments of self-emissive displays in the existing technology.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] This utility model provides a display device that can switch between transmission and reflection, including a self-emissive display panel, a liquid crystal display panel disposed on the light-emitting side of the self-emissive display panel, and a quarter-wave plate disposed between the self-emissive display panel and the liquid crystal display panel;

[0007] The liquid crystal display panel includes a counter substrate, an array substrate disposed opposite to the counter substrate, and a liquid crystal layer located between the counter substrate and the array substrate. The liquid crystal layer contains first-color bistable liquid crystal molecules and first-color dye liquid crystal molecules. The first-color dye liquid crystal molecules rotate with the first-color bistable liquid crystal molecules. When in the reflective state, the first-color bistable liquid crystal molecules reflect first-color light. The array substrate has a plurality of pixel electrodes arranged in an array. The counter substrate has a common electrode that cooperates with the pixel electrodes.

[0008] The liquid crystal display panel has a plurality of first pixel units arranged in an array, and each first pixel unit is provided with a corresponding pixel electrode. Among the plurality of first pixel units, there is a first color pixel unit. The opposing substrate is provided with an electrochromic layer and a color-changing driving electrode in the area corresponding to the first color pixel unit. The electrochromic layer is disposed between the common electrode and the color-changing driving electrode. The electrochromic layer can switch between black and transparent states. The array substrate is provided with a metal wire grid polarizer that is arranged on the entire surface. The light transmission axis of the metal wire grid polarizer is at 45° with the fast and slow axes of the quarter-wave plate.

[0009] In transmission mode, all first-color bistable liquid crystal molecules in the entire liquid crystal layer are in a transparent state, all electrochromic layers are in a transparent state, and the self-emissive display panel is turned on and displays an image. In reflection mode, the self-emissive display panel is turned off, the liquid crystal display panel is turned on and displays an image, when the first color pixel unit displays black, the corresponding electrochromic layer is black, when the first color pixel unit displays the first color, the corresponding electrochromic layer is in a transparent state and the corresponding first-color bistable liquid crystal molecules are in a reflective state.

[0010] Furthermore, all of the first pixel units are the first color pixel units.

[0011] Furthermore, the plurality of first pixel units include second color pixel units and third color pixel units, and the opposing substrate is provided with a color resist layer in the area corresponding to the second color pixel unit and the third color pixel unit. The color resist layer includes a second color resist layer corresponding to the second color pixel unit and a third color resist layer corresponding to the third color pixel unit.

[0012] Wherein, the first color, the second color, and the third color are each one of red, green, and blue.

[0013] Furthermore, the first color is red, the second color is green, and the third color is blue;

[0014] Alternatively, the first color is red, the second color is blue, and the third color is green;

[0015] Alternatively, the first color is blue, the second color is red, and the third color is green;

[0016] Alternatively, the first color is blue, the second color is green, and the third color is red;

[0017] Alternatively, the first color is green, the second color is blue, and the third color is red;

[0018] Alternatively, the first color may be green, the second color may be red, and the third color may be blue.

[0019] Furthermore, the self-emissive display panel has a second pixel unit corresponding to the light-emitting layer, and the positions and colors of the first pixel unit and the second pixel unit correspond to each other.

[0020] Furthermore, a black matrix is ​​provided on the opposing substrate, and the black matrix corresponds to the non-display area at the edge of the liquid crystal display panel.

[0021] Furthermore, a black matrix is ​​provided on the opposing substrate, and the black matrix is ​​provided in both the display area and the non-display area of ​​the liquid crystal display panel. The black matrix separates multiple first pixel units from each other in the display area.

[0022] Furthermore, the array substrate is provided with multiple scan lines, multiple data lines, and multiple thin-film transistors. The scan lines and the data lines are mutually insulated and cross each other to form multiple first pixel units distributed in a matrix. The pixel electrode is electrically connected to the scan lines and the data lines adjacent to the thin-film transistors through the thin-film transistors.

[0023] Furthermore, the self-emissive display panel includes a substrate and an anode, an emissive layer, and a cathode sequentially disposed on the substrate, wherein the anode and the cathode are used to control the luminescence state of the emissive layer.

[0024] Furthermore, the metal wire grid polarizer is disposed on the side of the array substrate facing the liquid crystal layer; or, the metal wire grid polarizer is disposed on the side of the array substrate facing the quarter-wave plate.

[0025] The advantages of this invention are as follows: By setting a liquid crystal display panel on the light-emitting side of the self-emissive display panel and setting a quarter-wave plate between the self-emissive display panel and the liquid crystal display panel, and by providing a metal wire grid polarizer on the array substrate of the liquid crystal display panel with the transmission axis of the metal wire grid polarizer at 45° to the fast and slow axes of the quarter-wave plate, the self-emissive display panel can be prevented from reflecting ambient light in transmission mode. Moreover, an electrochromic layer is provided in the area corresponding to the first color pixel unit on the opposing substrate. When the ambient light is bright, the liquid crystal display panel can use the ambient light reflected by the metal wire grid polarizer and the first color bistable liquid crystal molecules for display, thereby realizing the switching between transmission display and reflection display. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the display device in its initial state according to Embodiment 1 of this utility model.

[0027] Figure 2 This is a schematic diagram of the pixel arrangement structure of the liquid crystal display panel in Embodiment 1 of this utility model.

[0028] Figure 3 This is a schematic diagram of the pixel arrangement structure of the self-emissive display panel in Embodiment 1 of this utility model.

[0029] Figure 4 This is a schematic diagram of the planar structure of the array substrate in Embodiment 1 of this utility model.

[0030] Figure 5 This is a schematic diagram of the principle of the metal wire grid polarizer in Embodiment 1 of this utility model.

[0031] Figure 6 This is a schematic diagram illustrating the principle of the three state transitions of bistable liquid crystal molecules in Embodiment 1 of this utility model.

[0032] Figure 7 This is a schematic diagram of the driving signals for the three state transitions of bistable liquid crystal molecules in Embodiment 1 of this utility model.

[0033] Figure 8 This is a schematic diagram of the display device in Embodiment 1 of this utility model when displaying a pure red image via reflection.

[0034] Figure 9 This is one of the structural schematic diagrams of the display device in Embodiment 1 of this utility model when displaying a pure green image via reflection.

[0035] Figure 10 This is the second schematic diagram of the display device in Embodiment 1 of this utility model when displaying a pure green image.

[0036] Figure 11 This is one of the structural schematic diagrams of the display device in Embodiment 1 of this utility model when displaying a pure blue image by reflection.

[0037] Figure 12 This is the second schematic diagram of the display device in Embodiment 1 of this utility model when displaying a pure blue image.

[0038] Figure 13 This is one of the structural schematic diagrams of the display device in Embodiment 1 of this utility model when displaying a white image by reflection.

[0039] Figure 14 This is the second schematic diagram of the structure of the display device in Embodiment 1 of this utility model when displaying a white image by reflection.

[0040] Figure 15This is a schematic diagram of the display device in Embodiment 1 of this utility model when displaying a pure black image.

[0041] Figure 16 This is a schematic diagram of the display device in Embodiment 1 of this utility model when displaying a transmissive image.

[0042] Figure 17 This is a schematic diagram of the optical path principle of the display device in transmission mode in Embodiment 1 of this utility model.

[0043] Figure 18 This is a schematic diagram of the display device in its initial state in Embodiment 2 of this utility model.

[0044] Figure 19 This is a schematic diagram of the display device in its initial state in Embodiment 3 of this utility model. Detailed Implementation

[0045] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation methods, structure, features, and effects of the display device with switchable transmission and reflection according to this utility model:

[0046] [Example 1]

[0047] Figure 1 This is a schematic diagram of the display device in its initial state according to Embodiment 1 of this utility model. Figure 2 This is a schematic diagram of the pixel arrangement structure of the liquid crystal display panel in Embodiment 1 of this utility model. Figure 3 This is a schematic diagram of the pixel arrangement structure of the self-emissive display panel in Embodiment 1 of this utility model. Figure 4 This is a schematic diagram of the planar structure of the array substrate in Embodiment 1 of this utility model.

[0048] like Figures 1 to 4 As shown in Embodiment 1 of this utility model, a display device capable of switching between transmission and reflection includes a self-emissive display panel 20, a liquid crystal display panel 10 disposed on the light-emitting side of the self-emissive display panel 20, and a quarter-wave plate 30 disposed between the self-emissive display panel 20 and the liquid crystal display panel 10. Specifically, the self-emissive display panel 20, the quarter-wave plate 30, and the liquid crystal display panel 10 are sequentially stacked in the direction facing the external environment. The self-emissive display panel 20 is used to control the image display in transmission mode, and the liquid crystal display panel 10 is used to control the image display in reflection mode.

[0049] The liquid crystal display panel 10 includes an opposing substrate 11, an array substrate 12 disposed opposite to the opposing substrate 11, and a liquid crystal layer 13 located between the opposing substrate 11 and the array substrate 12. The liquid crystal layer 13 contains first-color bistable liquid crystal molecules 131 and first-color dye liquid crystal molecules 132, which are mixed together. The first-color dye liquid crystal molecules 132 rotate with the first-color bistable liquid crystal molecules 131. In the reflective state, the first-color bistable liquid crystal molecules 131 all reflect first-color light. The bistable liquid crystal molecules have three stable textures: P-state (Planar, reflective state), FC-state (Focal Conic, hazy state), and H-state (transparent state). In the P-state, the reflection spectrum of the bistable liquid crystal molecule is in the visible spectrum. The bistable liquid crystal molecule reflects bright colored light, and the specific color reflected can be set according to the pitch of the bistable liquid crystal molecule. In the FC-state, the bistable liquid crystal molecule no longer reflects the aforementioned colored light, and light can be scattered and passed through the bistable liquid crystal molecule. In the H-state, the bistable liquid crystal molecule no longer reflects the aforementioned colored light, and light can pass directly through the bistable liquid crystal molecule without any scattering effect. Under the action of a certain electric field, these three states can be interconverted. The first color dye liquid crystal molecule 132 is a positive dye liquid crystal molecule. The light absorption capacity of the long axis of the positive dye liquid crystal molecule is greater than that of the short axis. Positive dye liquid crystal molecules have the characteristic of strong light absorption capacity along the long axis and very weak light absorption capacity along the short axis. The long axis absorbs part of the light, thus exhibiting the color corresponding to the first color dye liquid crystal molecule 132. For example, the first color dye liquid crystal molecule 132 may be a violet dye liquid crystal molecule, whose long axis can absorb the green wavelength and thus appear violet; similarly, if it is a red dye liquid crystal molecule, its long axis can absorb the cyan wavelength and thus appear red. Of course, the first color dye liquid crystal molecule 132 can also be other single-color dye liquid crystal molecules, such as blue, green, or yellow. The first color bistable liquid crystal molecule 131 may be a cholesteric phase liquid crystal molecule.

[0050] The array substrate 12 has a plurality of pixel electrodes 121 arranged in an array, and the pixel electrodes 121 are block electrodes; the opposing substrate 11 has a common electrode 111 that cooperates with the pixel electrodes 121, and the common electrode 111 is a planar electrode that covers the entire surface of the opposing substrate 11. The pixel electrodes 121 and the common electrode 111 control the switching of the first color bistable liquid crystal molecules 131 between transparent, hazy and reflective states.

[0051] Figure 6 This is a schematic diagram illustrating the principle of the three state transitions of bistable liquid crystal molecules in Embodiment 1 of this utility model. Figure 7This is a schematic diagram of the driving signals for the three state transitions of the bistable liquid crystal molecules in Embodiment 1 of this utility model. Figure 6 and Figure 7 As shown, a common voltage signal Vcom is applied to the common electrode 111, and a first electrical signal V1 is continuously applied to the pixel electrode 121. There is a voltage difference (about 20V) between the common voltage signal Vcom and the first electrical signal V1. A strong vertical electric field is formed between the common electrode 111 and the pixel electrode 121. The first color bistable liquid crystal molecule 131 rotates and stops in the H state (transparent state). A common voltage signal Vcom is applied to the common electrode 111, and a second electrical signal V2 is applied to the pixel electrode 121. There is a voltage difference (e.g., 20V) between the second electrical signal V2 and the common voltage signal Vcom. The second electrical signal V2 gradually becomes the same as the common voltage signal Vcom within a first preset time. That is, the second electrical signal V2 first has a large voltage difference with the common voltage signal Vcom, and then slowly decreases and becomes the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is first formed between the common electrode 111 and the pixel electrode 121, and then the vertical electric field slowly disappears, causing the first color bistable liquid crystal molecule 131 to rotate and stagnate in the FC state, which is a scattering state and has a light-scattering effect. A common voltage signal Vcom is applied to the common electrode 111, and a third electrical signal V3 is applied to the pixel electrode 121. There is a voltage difference (e.g., 30V) between the third electrical signal V3 and the common voltage signal Vcom. The third electrical signal V3 directly becomes the same as the common voltage signal Vcom at a second preset time. The second preset time is shorter than the first preset time; that is, the third electrical signal V3 initially has a large voltage difference with the common voltage signal Vcom, and then rapidly decreases to become the same as the common voltage signal Vcom. Therefore, a strong vertical electric field is initially formed between the common electrode 111 and the pixel electrode 121, and then the vertical electric field rapidly disappears, causing the first color bistable liquid crystal molecule 131 to rotate and remain stationary in the P state, which is a reflective state. The bistable liquid crystal molecules 131 have different arrangement directions, resulting in different reflected visible light spectra. The remaining spectrum is transmitted, and the P state and FC state do not require voltage to maintain. The reflection spectrum band (Δλ) of the bistable liquid crystal molecule 131 is proportional to the pitch (Po) and average refractive index (n=(ne+no) / 2) of the bistable liquid crystal molecule 131, and the formula is: Δλ=nPo. Therefore, bistable liquid crystal molecules 131 with different pitches can reflect different colors of light in the reflection state.

[0052] like Figure 2As shown, the liquid crystal display panel 10 has a plurality of first pixel units P1 arranged in an array. Each first pixel unit P1 is provided with a corresponding pixel electrode 121, that is, the pixel electrode 121 corresponds one-to-one with the first pixel unit P1. Among the plurality of first pixel units P1, there is a first color pixel unit P11, which displays a first color when in a bright state. The opposing substrate 11 is provided with an electrochromic layer 114 and a color-changing driving electrode 115 in the area corresponding to the first color pixel unit P11. The electrochromic layer 114 is disposed between the common electrode 111 and the color-changing driving electrode 115. The color-changing driving electrode 115 and the common electrode 111 cooperate with each other, and the electrochromic layer 114 can switch between a black state and a transparent state. The switching of the electrochromic layer 114 between the black state and the transparent state is controlled by the color-changing driving electrode 115 and the common electrode 111. The electrochromic layer 114 includes a color-changing material layer, an electrolyte, and an ion storage layer, with the electrolyte located between the color-changing material layer and the ion storage layer. The color-changing material layer can be made of nickel oxide (NiO) or an electrochromic material. After an electrochemical reaction, it turns gray or black. The depth of gray or black is adjusted by regulating the voltage, thus changing the transmittance of the electrochromic layer 114. The electrochromic layer 114 consumes only a small amount of power during the color change process (the full driving voltage is only 0.5V-1.5V). No power is consumed after the color change is complete and the power is turned off, saving power consumption. Restoring transparency only requires applying a reverse voltage. Taking nickel oxide (NiO) as an example, its chemical formula for the reaction is: Of course, in other embodiments, the color-changing material layer may also be made of inorganic color-changing materials (such as tungsten trioxide and other metal oxides), polymer color-changing materials (such as violet-based materials), or polymer color-changing materials combined with ink.

[0053] like Figure 1 As shown, a metal wire grid polarizer 122 is provided on the array substrate 12, with its transmission axis at a 45° angle to the fast and slow axes of the quarter-wave plate 30. In this embodiment, the metal wire grid polarizer 122 is disposed on the side of the array substrate 12 facing the liquid crystal layer 13, and the pixel electrode 121 is disposed on the side of the metal wire grid polarizer 122 facing the liquid crystal layer 13. The metal wire grid polarizer 122 is covered by a planarization layer. Of course, in other embodiments, the metal wire grid polarizer 122 may also be disposed on the side of the array substrate 12 facing the quarter-wave plate 30.

[0054] Figure 5 This is a schematic diagram illustrating the principle of the metal wire grid polarizer in Embodiment 1 of this utility model. Figure 5As shown, the metal wire grid polarizer 122 possesses a unique polarization characteristic: it transmits polarized light perpendicular to the extension direction of the metal wire grid and reflects polarized light parallel to the extension direction of the metal wire grid. In the incident ray A, the ray's polarization direction includes a first polarized light a1 perpendicular to the extension direction of the metal wire grid and a second polarized light a2 parallel to the extension direction of the metal wire grid. The first polarized light a1, perpendicular to the extension direction of the metal wire grid, can pass through the metal wire grid polarizer to form the transmitted ray C, while the second polarized light a2, parallel to the extension direction of the metal wire grid, is reflected to form the reflected ray B. For a more detailed description of the metal wire grid polarizer, please refer to existing technology; it will not be elaborated upon here.

[0055] Furthermore, such as Figure 4 As shown, the array substrate 12 is provided with multiple scan lines 101, multiple data lines 102, and multiple thin-film transistors 103. The scan lines 101 and data lines 102 are mutually insulated and intersecting to form multiple first pixel units P1 arranged in a matrix. The pixel electrode 121 is electrically connected to the scan lines 101 and data lines 102 adjacent to the thin-film transistors 103 through the thin-film transistors 103. The thin-film transistor 103 includes a gate, an active layer, a drain, and a source. The gate is located on the same layer as the scan line 101 and is electrically connected. The gate and the active layer are isolated by an insulating layer. The source is electrically connected to the data line 102, and the drain is electrically connected to the pixel electrode 121 through a contact hole.

[0056] Furthermore, such as Figure 1 As shown, a black matrix 112 is provided on the opposing substrate 11. The black matrix 112 is provided in both the display area and the non-display area of ​​the liquid crystal display panel 10. The black matrix 112 separates multiple first pixel units P1 from each other in the display area, thereby avoiding the problem of color mixing between adjacent first pixel units P1.

[0057] In this embodiment, as Figure 1As shown, the self-emissive display panel 20 is an OLED display panel. The self-emissive display panel 20 includes a substrate 21 and an anode 22, a light-emitting layer 23, and a cathode 24 sequentially disposed on the substrate 21. The anode 22 and cathode 24 are used to control the light-emitting state of the light-emitting layer 23. By applying corresponding electrical signals to the anode 22 and cathode 24, the light-emitting layer 23 is controlled to emit light. The anode 22 may include an indium tin oxide (ITO) trace layer, a silver (Ag) reflective layer, and an ITO electrode layer sequentially disposed on the substrate 21. The ITO trace layer and ITO electrode layer can also be replaced by an indium zinc oxide (IZO) trace layer and IZO electrode layer, etc. The cathode 24 can be made of materials such as silver, silver-magnesium (Mg) alloy, molybdenum (Mo), or aluminum (Al). It is understandable that the anode 22, the light-emitting layer 23, and the cathode 24 are not a whole-surface structure, but rather have a patterned structure corresponding to the pixels. For a more detailed introduction to OLED display panels, please refer to existing technologies, which will not be elaborated here.

[0058] like Figure 1 As shown, in this embodiment, the plurality of first pixel units P1 include second color pixel units P12 and third color pixel units P13. The opposing substrate 11 has a color resist layer 113 in the areas corresponding to the second color pixel units P12 and the third color pixel units P13. The color resist layer 113 includes a second color resist layer 113a corresponding to the second color pixel unit P12 and a third color resist layer 113b corresponding to the third color pixel unit P13. The opposing substrate 11 does not need to have a color resist layer in the first color pixel unit P11; color is achieved through the light reflected by the first color bistable liquid crystal molecules 131. The opposing substrate 11 also does not need to have an electrochromic layer 114 and a color-changing driving electrode 115 in the second color pixel units P12 and the third color pixel unit P13; black is achieved through the light absorption effect of the first color dye liquid crystal molecules 132. The first color, second color, and third color are each one of red, green, and blue. Therefore, in reflective mode, the liquid crystal display panel 10 can achieve full-color display.

[0059] In this embodiment, the first color is red, the second color is green, and the third color is blue. Specifically, the first color bistable liquid crystal molecule 131 is a red bistable liquid crystal molecule, the first color dye liquid crystal molecule 132 is a red dye liquid crystal molecule, the second color resist layer 113a is a green color resist, and the third color resist layer 113b is a blue color resist. Of course, in other embodiments, the first color is red, the second color is blue, and the third color is green, that is, the first color bistable liquid crystal molecule 131 is a red bistable liquid crystal molecule, the first color dye liquid crystal molecule 132 is a red dye liquid crystal molecule, the second color resist layer 113a is a blue color resist, and the third color resist layer 113b is a green color resist; or, the first color is green, the second color is red, and the third color is blue, that is, the first color bistable liquid crystal molecule 131 is a green bistable liquid crystal molecule, the first color dye liquid crystal molecule 132 is a green dye liquid crystal molecule, the second color resist layer 113a is a red color resist, and the third color resist layer 113b is a blue color resist; or, the first color is green, the second color is blue, and the third color is red, that is, the first color bistable liquid crystal molecule 131 is a green bistable liquid crystal molecule. The molecules are arranged such that the first color dye liquid crystal molecule 132 is a green dye liquid crystal molecule, the second color resist layer 113a is a blue color resist, and the third color resist layer 113b is a red color resist; or, the first color is blue, the second color is red, and the third color is green, that is, the first color bistable liquid crystal molecule 131 is a blue bistable liquid crystal molecule, the first color dye liquid crystal molecule 132 is a blue dye liquid crystal molecule, the second color resist layer 113a is a red color resist, and the third color resist layer 113b is a green color resist; or, the first color is blue, the second color is green, and the third color is red, that is, the first color bistable liquid crystal molecule 131 is a blue bistable liquid crystal molecule, the first color dye liquid crystal molecule 132 is a blue dye liquid crystal molecule, the second color resist layer 113a is a green color resist, and the third color resist layer 113b is a red color resist. No restrictions are imposed here.

[0060] like Figure 3 As shown, the self-emissive display panel 20 has a plurality of second pixel units P2 arranged in an array, and the positions and colors of the first pixel unit P1 and the second pixel unit P2 correspond to each other. That is, the red sub-pixels of the first pixel unit P1 correspond one-to-one with the red sub-pixels of the second pixel unit P2, the blue sub-pixels of the first pixel unit P1 correspond one-to-one with the blue sub-pixels of the second pixel unit P2, and the green sub-pixels of the first pixel unit P1 correspond one-to-one with the green sub-pixels of the second pixel unit P2.

[0061] The display device in this embodiment has a transmission mode and a reflection mode, and can switch between the two modes. In the transmission mode, all the first-color bistable liquid crystal molecules 131 in the entire liquid crystal layer 13 are in a transparent state (transparent or hazy state), all the electrochromic layers 114 are in a transparent state, and the self-emissive display panel 20 is turned on and displays the image. In the reflection mode, the self-emissive display panel 20 is turned off, the liquid crystal display panel 10 is turned on and displays the image, when the first color pixel unit P11 displays black, the corresponding electrochromic layer 114 is black, and when the first color pixel unit P11 displays the first color, the corresponding electrochromic layer 114 is in a transparent state and the corresponding first-color bistable liquid crystal molecules 131 are in a reflective state.

[0062] Figure 8 This is a schematic diagram of the display device in Embodiment 1 of this utility model when displaying a pure red image via reflection. Figure 8 As shown, when the display device reflects the first color (red), the self-emissive display panel 20 is turned off, and all first color pixel units P11 are in a bright state and all second color pixel units P12 and third color pixel units P13 are in a dark state. Specifically, all electrochromic layers 114 are controlled to be in a transparent state, allowing ambient light to pass through them. The first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the first color pixel unit P11 are controlled to lie flat, so that the first color bistable liquid crystal molecules 131 in the region corresponding to the first color pixel unit P11 are in a reflective state, reflecting the first color light (red light). The first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the regions corresponding to the second color pixel unit P12 and the third color pixel unit P13 are controlled to lie flat, so that the first color bistable liquid crystal molecules 131 in the regions corresponding to the second color pixel unit P12 and the third color pixel unit P13 are in a reflective state, and the ambient light is absorbed by the color resist layer 113 and the first color dye liquid crystal molecules 132, resulting in black.

[0063] Figure 9 This is one of the structural schematic diagrams of the display device in Embodiment 1 of this utility model when displaying a pure green image via reflection. Figure 10 This is the second schematic diagram of the display device in Embodiment 1 of this utility model when displaying a pure green image via reflection. Figure 9 and Figure 10 As shown, when the display device reflects and displays the second color (green), the self-emissive display panel 20 is turned off, controlling all second-color pixel units P12 to be in a bright state and all first-color pixel units P11 and third-color pixel units P13 to be in a dark state. Specifically, as... Figure 9 As shown, all electrochromic layers 114 are controlled to be in a black state. At this time, ambient light is directly absorbed by the electrochromic layers 114, resulting in a black color. The first color bistable liquid crystal molecules 131 in the region corresponding to the first color pixel unit P11 can be in any of the following states: transparent, reflective, or hazy, such as reflective. Furthermore, the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the third color pixel unit P13 are both controlled to lie flat, so that the first color bistable liquid crystal molecules 131 in the region corresponding to the third color pixel unit P13 are all in a reflective state. Ambient light is absorbed by the colored resist layer 113 and the first color dye liquid crystal molecules 132, resulting in black; and the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the second color pixel unit P12 are both perpendicular to the opposing substrate 11 and the array substrate 12, so that the first color bistable liquid crystal molecules 131 in the region corresponding to the second color pixel unit P12 are all in a transparent state. At this time, the metal wire grid polarizer 122 in the region of the second color pixel unit P12 reflects light (green light) corresponding to the color of the second color resist layer 113a. Or, as Figure 10 As shown, all electrochromic layers 114 are controlled to be in a black state. At this time, ambient light is directly absorbed by the electrochromic layers 114, resulting in a black color. The first color bistable liquid crystal molecules 131 in the region corresponding to the first color pixel unit P11 can be in any of the following states: transparent, reflective, or hazy, for example, transparent. Furthermore, the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the third color pixel unit P13 are both controlled to lie flat, so that the first color bistable liquid crystal molecules 131 in the region corresponding to the third color pixel unit P13 are all in a reflective state. Ambient light is absorbed by the color resist layer 113 and the first color... The dye liquid crystal molecules 132 absorb the liquid together, resulting in black; and the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the second color pixel unit P12 are both in a disordered tilted state, so that the first color bistable liquid crystal molecules 131 in the area corresponding to the second color pixel unit P12 are all in a fog state. At this time, the metal wire grid polarizer 122 in the area of ​​the second color pixel unit P12 reflects the light (green light) corresponding to the color of the second color resist layer 113a. Since the first color bistable liquid crystal molecules 131 are in a fog state, the second color pixel unit P12 is in a slow reflection state, achieving a foggy green display effect.

[0064] Figure 11 This is one of the structural schematic diagrams of the display device in Embodiment 1 of this utility model when displaying a pure blue image by reflection. Figure 12 This is the second schematic diagram of the display device in Embodiment 1 of this utility model when displaying a pure blue image via reflection. For example... Figure 11 and Figure 12 As shown, when the display device reflects and displays the third color (blue), the self-emissive display panel 20 is turned off, controlling all third-color pixel units P13 to be in a bright state and all first-color pixel units P11 and second-color pixel units P12 to be in a dark state. Specifically, as... Figure 11 As shown, all electrochromic layers 114 are controlled to be in a black state. At this time, ambient light is directly absorbed by the electrochromic layers 114, resulting in a black color. The first color bistable liquid crystal molecules 131 in the region corresponding to the first color pixel unit P11 can be in any of the following states: transparent, reflective, or hazy, for example, reflective. Furthermore, the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the second color pixel unit P12 are both controlled to lie flat, so that the first color bistable liquid crystal molecules 131 in the region corresponding to the second color pixel unit P12 are all in a reflective state. Ambient light is absorbed by the color resist layer 113 and the first color dye liquid crystal molecules 132, resulting in black; and the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the third color pixel unit P13 are both perpendicular to the opposing substrate 11 and the array substrate 12, so that the first color bistable liquid crystal molecules 131 in the region corresponding to the third color pixel unit P13 are all in a transparent state. At this time, the metal wire grid polarizer 122 in the region of the third color pixel unit P13 reflects light (blue light) corresponding to the color of the third color resist layer 113b. Or, as Figure 12 As shown, all electrochromic layers 114 are controlled to be in a black state. At this time, ambient light is directly absorbed by the electrochromic layers 114, resulting in a black color. The first color bistable liquid crystal molecules 131 in the region corresponding to the first color pixel unit P11 can be in any of the following states: transparent, reflective, or hazy, for example, transparent. Furthermore, the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the second color pixel unit P12 are both controlled to lie flat, so that the first color bistable liquid crystal molecules 131 in the region corresponding to the second color pixel unit P12 are all in a reflective state. Ambient light is absorbed by the color resist layer 113 and the first color... The dye liquid crystal molecules 132 absorb the liquid crystals together, resulting in black. Furthermore, the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the third color pixel unit P13 are both in a disordered tilted state, causing the first color bistable liquid crystal molecules 131 in the region corresponding to the third color pixel unit P13 to be in a foggy state. At this time, the metal wire grid polarizer 122 in the region of the third color pixel unit P13 reflects light (blue light) corresponding to the color of the third color resist layer 113b. Since the first color bistable liquid crystal molecules 131 are in a foggy state, the third color pixel unit P13 is in a slow reflection state, achieving a foggy blue display effect.

[0065] Figure 13This is one of the structural schematic diagrams of the display device in Embodiment 1 of this utility model when displaying a white image by reflection. Figure 14 This is the second schematic diagram of the display device in Embodiment 1 of this utility model when displaying a white image via reflection. Figure 13 and Figure 14 As shown, when the display device reflects and displays a white image, the self-emissive display panel 20 is turned off, and all the first color pixel units P11, the second color pixel unit P12, and the third color pixel unit P13 are controlled to be in a lit state. Specifically, as... Figure 13 As shown, all electrochromic layers 114 are controlled to be in a transparent state, allowing ambient light to pass through them. The first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the first color pixel unit P11 are controlled to lie flat, so that the first color bistable liquid crystal molecules 131 in the region corresponding to the first color pixel unit P11 are in a reflective state, reflecting the first color light (red light). Furthermore, the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the second color pixel unit P12 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, so that the second... The first color bistable liquid crystal molecules 131 in the region corresponding to color pixel unit P12 are all in a transparent state. At this time, the metal wire grid polarizer 122 in the region of second color pixel unit P12 reflects light (green light) corresponding to the color of the second color resist layer 113a; and controls the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to third color pixel unit P13 to be perpendicular to the opposing substrate 11 and the array substrate 12, so that the first color bistable liquid crystal molecules 131 in the region corresponding to third color pixel unit P13 are all in a transparent state. At this time, the metal wire grid polarizer 122 in the region of third color pixel unit P13 reflects light (blue light) corresponding to the color of the third color resist layer 113b. Or, as Figure 14As shown, all electrochromic layers 114 are controlled to be in a transparent state, allowing ambient light to pass through them. The first-color bistable liquid crystal molecules 131 and the first-color dye liquid crystal molecules 132 in the region corresponding to the first color pixel unit P11 are controlled to lie flat, making the first-color bistable liquid crystal molecules 131 in the region corresponding to the first color pixel unit P11 reflective light (red light). Furthermore, the first-color bistable liquid crystal molecules 131 and the first-color dye liquid crystal molecules 132 in the region corresponding to the second color pixel unit P12 are controlled to be in a disordered tilted state, making the first-color bistable liquid crystal molecules 131 in the region corresponding to the second color pixel unit P12 hazy. At this time, the second color pixel unit P11... In region 2, the metal wire grid polarizer 122 reflects light (green light) corresponding to the color of the second color resist layer 113a. Since the first color bistable liquid crystal molecules 131 are in a foggy state, the second color pixel unit P12 exhibits slow reflection, achieving a foggy green display effect. Similarly, the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the region corresponding to the third color pixel unit P13 are controlled to be in a disordered tilted state, causing the first color bistable liquid crystal molecules 131 in the region corresponding to the third color pixel unit P13 to be in a foggy state. At this time, the metal wire grid polarizer 122 in the region of the third color pixel unit P13 reflects light (blue light) corresponding to the color of the third color resist layer 113b. Since the first color bistable liquid crystal molecules 131 are in a foggy state, the third color pixel unit P13 exhibits slow reflection, achieving a foggy blue display effect. White light is formed by the mixing of red, green, and blue light.

[0066] Figure 15 This is a schematic diagram of the display device in Embodiment 1 of this utility model when displaying a pure black image via reflection. Figure 15When the display device reflects and displays a pure black image, the self-emissive display panel 20 is turned off, and all the first color pixel units P11, second color pixel units P12, and third color pixel units P13 are controlled to be in a black state. Specifically, all electrochromic layers 114 are controlled to be in a black state. At this time, ambient light is directly absorbed by the electrochromic layers 114, resulting in black. The first color bistable liquid crystal molecules 131 in the area corresponding to the first color pixel unit P11 can be in any of the following states: transparent, reflective, or hazy, for example, reflective. Furthermore, the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the areas corresponding to the second color pixel units P12 and the third color pixel units P13 are controlled to lie flat, so that the first color bistable liquid crystal molecules 131 in the areas corresponding to the second color pixel units P12 and the third color pixel units P13 are in a reflective state. Ambient light is absorbed by the color resist layer 113 and the first color dye liquid crystal molecules 132, resulting in black.

[0067] In this embodiment, when the display device displays color, it is sufficient to control the corresponding first color pixel unit P11, second color pixel unit P12, and third color pixel unit P13 to be in a bright state. Specifically, the corresponding electrochromic layer 114 is controlled to be in a transparent state, allowing ambient light to pass through it. The first color bistable liquid crystal molecules 131 and first color dye liquid crystal molecules 132 in the corresponding area of ​​the first color pixel unit P11 are controlled to be in a flat position, so that the first color bistable liquid crystal molecules 131 in the corresponding area of ​​the first pixel unit P1 are in a reflective state. At this time, the liquid crystal layer 13 in the corresponding area of ​​the first pixel unit P1 reflects the first color light (red light). Furthermore, the first color bistable liquid crystal molecules 131 and first color dye liquid crystal molecules 132 in the corresponding area of ​​the second color pixel unit P12 are controlled to be perpendicular to the opposing substrate 11 and the array substrate 12, or to be in a disordered tilted state. The first color bistable liquid crystal molecules 131 in the area corresponding to the second color pixel unit P12 are either in a transparent or hazy state. In this state, the second color pixel unit P12 reflects light (green light) corresponding to the color of the second color resist layer 113a. Furthermore, the first color bistable liquid crystal molecules 131 and the first color dye liquid crystal molecules 132 in the area corresponding to the third color pixel unit P13 are either perpendicular to the opposing substrate 11 and the array substrate 12 or exhibit a disordered tilt state. This results in the first color bistable liquid crystal molecules 131 in the area corresponding to the third color pixel unit P13 being either in a transparent or hazy state. In this state, the third color pixel unit P13 reflects light (blue light) corresponding to the color of the third color resist layer 113b. Based on the principle of mixing red, green, and blue light, various colors of light are formed, thereby achieving color display.

[0068] Figure 16This is a schematic diagram of the display device in Embodiment 1 of this utility model when displaying a transmissive image. Figure 17 This is a schematic diagram of the optical path principle of the display device in transmission mode according to Embodiment 1 of this utility model. Figure 16 As shown, in the transmission mode, all the first-color bistable liquid crystal molecules 131 in the entire liquid crystal layer 13 are in a light-transmitting state (transparent or hazy), and all the electrochromic layers 114 are in a transparent state. The self-emissive display panel 20 is turned on and displays the image. The image displayed in the transmission mode is controlled by the self-emissive display panel 20. Specifically, all the electrochromic layers 114 are controlled to be in a transparent state, and all the first-color bistable liquid crystal molecules 131 are controlled to be in a light-transmitting state (transparent or hazy), so that the light emitted by the self-emissive display panel 20 can pass through the liquid crystal display panel 10. Figure 17 As shown, for ambient light, ambient light I passes through the liquid crystal layer 13 and the metal wire grid polarizer 122 and becomes linearly polarized light (e.g., 0°). The linearly polarized light passes through the quarter-wave plate 30 and becomes circularly polarized light (e.g., left-handed). The circularly polarized light is reflected by the cathode 24 and then rotates in the opposite direction (becomes right-handed). The reflected light passes through the liquid crystal layer 13 and is still circularly polarized light (e.g., right-handed). The circularly polarized light passes through the quarter-wave plate 30 and becomes linearly polarized light (e.g., 90°), and is then absorbed by the metal wire grid polarizer 122. For the light (BL) emitted by the self-emissive display panel 20, the light does not change after passing through the quarter-wave plate 30, and then becomes linearly polarized light (e.g., 0°) after passing through the metal wire grid polarizer 122 and is emitted after passing through the liquid crystal layer 13. This allows the light emitted by the self-emissive display panel 20 to pass through the liquid crystal display panel 10, and in transmission mode, the displayed image is controlled by the self-emissive display panel 20. Furthermore, the ambient light reflected by the self-emissive display panel 20 is absorbed by the metal wire grid polarizer 122, thus preventing the reflected ambient light from reducing the contrast of the transmission display. The metal wire grid polarizer 122, while ensuring the transmission display effect, also serves as a reflective layer for the liquid crystal display panel 10, saving a metal reflective layer manufacturing process and achieving low-power, multi-functional display.

[0069] [Example 2]

[0070] Figure 18 This is a schematic diagram of the display device in its initial state according to Embodiment 2 of this utility model. Figure 18 As shown, the display device with switchable transmission and reflection provided in Embodiment 2 of this utility model is similar to that in Embodiment 1. Figures 1 to 17 The display devices that can switch between transmission and reflection in ) are basically the same, the difference being:

[0071] In this embodiment, a black matrix 112 is provided on the opposing substrate 11. The black matrix 112 corresponds to the non-display area at the edge of the liquid crystal display panel 10. The black matrix 112 does not need to be provided in the display area of ​​the liquid crystal display panel 10, thereby increasing the utilization rate of ambient light by the liquid crystal display panel 10 and improving the display brightness.

[0072] Those skilled in the art should understand that the remaining structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

[0073] [Example 3]

[0074] Figure 19 This is a schematic diagram of the display device in its initial state according to Embodiment 3 of this utility model. Figure 19 As shown, the display device with switchable transmission and reflection provided in Embodiment 3 of this utility model is similar to that in Embodiment 1. Figures 1 to 17 The display devices that can switch between transmission and reflection in ) are basically the same, the difference being:

[0075] In this embodiment, all first pixel units P1 are first color pixel units P11, that is, the liquid crystal display panel 10 only reflects and displays a single color image, such as a single red image, a single blue image, or a single chromatic color image. Therefore, there is no need to set a color resist layer 113 on the opposing substrate 11, and there is no need for a special correspondence between the first pixel unit P1 on the liquid crystal display panel 10 and the second pixel unit P2 on the self-emissive display panel 20, which simplifies the structure and facilitates manufacturing.

[0076] 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.

[0077] In this document, the directional terms such as up, down, left, right, front, and back are defined according to the position of the structures in the accompanying drawings and the relative positions of the structures, and are only used for clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second," etc., used herein are only used for distinction in name and are not used to limit the number or order.

[0078] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. 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 utility model. These 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 utility model without departing from the scope of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A display device switchable between transmission and reflection, characterized in that It includes a self-emissive display panel (20), a liquid crystal display panel (10) disposed on the light-emitting side of the self-emissive display panel (20), and a quarter-wave plate (30) disposed between the self-emissive display panel (20) and the liquid crystal display panel (10); The liquid crystal display panel (10) includes an opposing substrate (11), an array substrate (12) disposed opposite to the opposing substrate (11), and a liquid crystal layer (13) located between the opposing substrate (11) and the array substrate (12). The liquid crystal layer (13) is provided with a first color bistable liquid crystal molecule (131) and a first color dye liquid crystal molecule (132). The first color dye liquid crystal molecule (132) rotates with the first color bistable liquid crystal molecule (131). The first color bistable liquid crystal molecule (131) reflects first color light in the reflective state. The array substrate (12) is provided with a plurality of pixel electrodes (121) arranged in an array. The opposing substrate (11) is provided with a common electrode (111) that cooperates with the pixel electrodes (121). The liquid crystal display panel (10) has a plurality of first pixel units (P1) arranged in an array. Each first pixel unit (P1) is provided with a corresponding pixel electrode (121). Among the plurality of first pixel units (P1), there is a first color pixel unit (P11). The opposing substrate (11) is provided with an electrochromic layer (114) and a color-changing driving electrode (115) in the area corresponding to the first color pixel unit (P11). The electrochromic layer (114) is disposed between the common electrode (111) and the color-changing driving electrode (115). The electrochromic layer (114) can switch between black and transparent states. The array substrate (12) is provided with a metal wire grid polarizer (122) arranged on the entire surface. The light transmission axis of the metal wire grid polarizer (122) is at 45° with the fast and slow axis of the quarter-wave plate (30). In transmission mode, all first-color bistable liquid crystal molecules (131) in the entire liquid crystal layer (13) are in a transparent state, all electrochromic layers (114) are in a transparent state, and the self-emissive display panel (20) is turned on and displays an image. In reflection mode, the self-emissive display panel (20) is turned off, the liquid crystal display panel (10) is turned on and displays an image. When the first color pixel unit (P11) displays black, the corresponding electrochromic layer (114) is black. When the first color pixel unit (P11) displays the first color, the corresponding electrochromic layer (114) is in a transparent state and the corresponding first-color bistable liquid crystal molecule (131) is in a reflective state.

2. The transmissively and reflectively switchable display device of claim 1, wherein, All of the first pixel units (P1) are the first color pixel units (P11).

3. The transmissively and reflectively switchable display device of claim 1, wherein, The plurality of first pixel units (P1) have a second color pixel unit (P12) and a third color pixel unit (P13). The opposing substrate (11) has a color resist layer (113) in the area corresponding to the second color pixel unit (P12) and the third color pixel unit (P13). The color resist layer (113) includes a second color resist layer (113a) corresponding to the second color pixel unit (P12) and a third color resist layer (113b) corresponding to the third color pixel unit (P13). Wherein, the first color, the second color, and the third color are each one of red, green, and blue.

4. A transmissively and reflectively switchable display device according to claim 3, wherein, The first color is red, the second color is green, and the third color is blue; Alternatively, the first color is red, the second color is blue, and the third color is green; Alternatively, the first color is blue, the second color is red, and the third color is green; Alternatively, the first color is blue, the second color is green, and the third color is red; Alternatively, the first color is green, the second color is blue, and the third color is red; Alternatively, the first color may be green, the second color may be red, and the third color may be blue.

5. The transmissively and reflectively switchable display device of claim 3, wherein, The self-emissive display panel (20) has a light-emitting layer (23) on its substrate (21). The self-emissive display panel (20) has a second pixel unit (P2) corresponding to the light-emitting layer (23). The positions and colors of the first pixel unit (P1) and the second pixel unit (P2) are mutually corresponding.

6. A transmissively and reflectively switchable display device according to any of claims 1-5, characterized in that, The opposing substrate (11) is provided with a black matrix (112), which corresponds to the non-display area at the edge of the liquid crystal display panel (10).

7. A transmissively and reflectively switchable display device according to any of claims 1-5, characterized in that The opposing substrate (11) is provided with a black matrix (112), and the black matrix (112) is provided in both the display area and the non-display area of ​​the liquid crystal display panel (10). The black matrix (112) separates multiple first pixel units (P1) from each other in the display area.

8. The display device with switchable transmission and reflection according to any one of claims 1-5, characterized in that, The array substrate (12) is provided with multiple scan lines (101), multiple data lines (102) and multiple thin film transistors (103). The scan lines (101) and the data lines (102) are mutually insulated and cross each other to form multiple first pixel units (P1) distributed in a matrix. The pixel electrode (121) is electrically connected to the scan lines (101) and the data lines (102) adjacent to the thin film transistors (103) through the thin film transistors (103).

9. The display device with switchable transmission and reflection according to any one of claims 1-5, characterized in that, The self-emissive display panel (20) includes a substrate (21) and an anode (22), an emissive layer (23) and a cathode (24) sequentially disposed on the substrate (21). The anode (22) and the cathode (24) are used to control the light emission state of the emissive layer (23).

10. A transmissively and reflectively switchable display device according to any of claims 1-5, characterized in that, The metal wire grid polarizer (122) is arranged on a side of the array substrate (12) facing the liquid crystal layer (13); or the metal wire grid polarizer (122) is arranged on a side of the array substrate (12) facing the quarter-wave plate (30).

Images