Double-sided display panel

Abstract

A double-sided display panel comprises a first substrate, a first display structure and a second display structure, the first display structure and the second display structure are connected to two sides of the first substrate in a first direction respectively and face each other in the first direction, the first display structure comprises a first optical member and a second optical member, the first optical member and the second optical member are arranged oppositely along a second direction, the first direction and the second direction intersect, the first optical member is used for receiving external light and reflecting the external light to the second optical member, the second optical member is used for reflecting the light from the first optical member and emitting the light from the first display structure, the first optical member is also used for transmitting the external light to the second display structure and emitting the light from the second display structure, the double-sided display function of the double-sided display panel is realized, the number of optical elements of the double-sided display panel is reduced, the overall optical architecture of the double-sided display panel is simplified, and the assembly difficulty and production cost of the double-sided display panel are reduced.

Description

Technical Field

[0001] This invention relates to the field of double-sided display technology, and more specifically to a double-sided display panel. Background Technology

[0002] Traditional display panels are mostly unidirectional light-emitting structures, enabling only single-sided display. However, in applications such as public transportation guidance, commercial advertising windows, and information interaction terminals, the demand for simultaneous double-sided display is becoming increasingly urgent. To achieve double-sided display, current technologies typically use two independent display modules spliced ​​back-to-back, resulting in redundant overall optical architecture, complex assembly, and high production costs for double-sided displays. Summary of the Invention

[0003] The purpose of this invention is to provide a double-sided display panel that solves the problems of redundant overall optical architecture, complex assembly, and high production costs of double-sided displays.

[0004] To achieve the objectives of this invention, the following technical solution is provided: This invention provides a double-sided display panel, comprising a first substrate, a first display structure, and a second display structure. The first display structure and the second display structure are respectively connected to two sides of the first substrate in a first direction and are opposite to each other in the first direction. The first display structure includes a first optical element and a second optical element, which are disposed opposite to each other along a second direction, the first direction and the second direction intersecting. The first optical element is used to receive external light rays incident from the side of the first display structure away from the second display structure and reflect the external light rays to the second optical element. The second optical element is used to reflect the light rays from the first optical element and emit them from the first display structure. The first optical element is also used to transmit the external light rays to the second display structure and emit them from the second display structure.

[0005] In one embodiment, the angle between the optical surface of the first optical element and the optical surface of the second optical element is 90°, and the angles between the optical surfaces of the first optical element and the optical surfaces of the second optical element and the plane on which the first substrate is located are both 45°.

[0006] In one embodiment, the first optical element is a semi-reflective and semi-transparent element, the light reflected from the first optical element to the second optical element is configured as a first light ray, and the light transmitted through the first optical element to the second display structure is configured as a second light ray, wherein the polarization directions of the first light ray and the second light ray are different.

[0007] In one embodiment, the second display structure includes a liquid crystal layer and a first polarizer sequentially stacked on the first substrate. The transmission axis of the first polarizer is orthogonal to the transmission axis of the first optical element. The liquid crystal layer is used to receive the second light and convert the second light into a third light that is emitted to the first polarizer. The polarization direction of the third light is the same as or orthogonal to the transmission axis of the first polarizer.

[0008] In one embodiment, the first display structure further includes a first color resist, and the second display structure includes a second color resist. The first color resist is opposite to at least one of the first optical element and the second optical element in the first direction, and the second color resist is opposite to the first optical element in the first direction. The transmission spectral range of the first color resist and the transmission spectral range of the second color resist overlap or at least partially do not overlap.

[0009] In one embodiment, the first optical element is a dichroic filter element, the light reflected from the first optical element to the second optical element is configured as a first light, and the light transmitted through the first optical element to the second display structure is configured as a second light, wherein the wavelength ranges of the first light and the second light are different.

[0010] In one embodiment, the second display structure includes a second color resist, which is opposite to the first optical element in the first direction, and the reflection spectrum range of the first optical element and the transmission spectrum range of the second color resist do not overlap at least partially.

[0011] In one embodiment, the second display structure includes a second polarizer, a liquid crystal layer, and a first polarizer stacked sequentially on the first substrate. The transmission axis of the first polarizer is orthogonal to that of the second polarizer. The second polarizer is used to receive the second light and convert the second light into a fourth light that is emitted to the liquid crystal layer. The liquid crystal layer is used to convert the fourth light into a third light that is emitted to the first polarizer. The polarization direction of the third light is the same as or orthogonal to the transmission axis of the first polarizer.

[0012] In one embodiment, the first optical element and the second optical element have the same optical properties; the second optical element is further configured to receive external light and reflect the external light to the first optical element, the first optical element is configured to reflect the light from the second optical element out of the first display structure; the second optical element is further configured to transmit the external light to the second display structure.

[0013] In one embodiment, the first display structure further includes a third optical element disposed between the first optical element and the second optical element, the third optical element being used to switch between a transparent state and a non-transparent state.

[0014] In one embodiment, the third optical element includes a control electrode layer and an electrochromic layer sequentially stacked on the first substrate. The control electrode layer is used to apply a voltage to the electrochromic layer to switch the electrochromic layer between a transparent state and a non-transparent state.

[0015] In one embodiment, the first display structure further includes a first isolator, which is disposed on the side of the third optical element away from the first substrate, and in the orthographic projection in the first direction, the projection of the third optical element is located within the projection of the first isolator.

[0016] In one embodiment, the double-sided display panel includes a first display component and a second display component; the first display component includes a second substrate and a plurality of first display structures, the second substrate and the first substrate are disposed at a distance from each other in a first direction, and the plurality of first display structures are arranged in a multi-row, multi-column array between the first substrate and the second substrate; the second display component includes a third substrate and a plurality of second display structures, the third substrate and the first substrate are disposed at a distance from each other in the first direction, and the plurality of second display structures are disposed between the first substrate and the third substrate, and correspond one-to-one with the plurality of first display structures in the first direction.

[0017] In one embodiment, the first display component further includes a plurality of second isolation members, which are sequentially and spaced apart between the first substrate and the second substrate along the second direction, and a first display structure is disposed between any two adjacent second isolation members.

[0018] The double-sided display panel provided by the present invention achieves the double-sided display function by respectively setting a first display structure and a second display structure on both sides of a first substrate. The first display structure includes a first optical element and a second optical element arranged opposite to each other. The first optical element reflects a portion of the external light to the second optical element and then emits it from the first display structure, while the other portion is transmitted to the second display structure and then emits it from the second display structure. This reduces the number of optical elements in the double-sided display panel, thereby simplifying the overall optical architecture of the double-sided display panel and reducing the assembly difficulty and production cost of the double-sided display panel. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a double-sided display panel according to one embodiment; Figure 2 One embodiment of the double-sided display panel in use Figure 1 ; Figure 3 One embodiment of the double-sided display panel in use Figure 2 ; Figure 4 One embodiment of the double-sided display panel in use Figure 3 ; Figure 5 This is a schematic diagram of the structure of a double-sided display panel according to another embodiment; Figure 6 This is another embodiment of the double-sided display panel in use. Figure 1 ; Figure 7 This is another embodiment of the double-sided display panel in use. Figure 2 ; Figure 8 This is another embodiment of the double-sided display panel in use. Figure 3 .

[0021] Explanation of reference numerals in the attached figures: 100-Double-sided display panel; 10 - First substrate; 20-First display structure, 21-First optical component, 22-Second optical component, 23-Third optical component, 24-Control electrode layer, 25-Electrochromic layer, 26-First insulating component, 27-First color resist; 30-Second display structure, 31-Array substrate layer, 32-Liquid crystal layer, 33-First polarizer, 34-Second color resist, 35-Second polarizer; 40 - First display assembly, 41 - Second substrate, 42 - First display unit, 43 - Second isolator; 50 - Second display component, 51 - Third substrate, 52 - Second display unit; L0 - External ray, L1 - First ray, L2 - Second ray, L3 - Third ray, L4 - Fourth ray; X - Second direction, Z - First direction. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or it can be in a middle component. When a component is said to be "connected" to another component, it can be directly connected to the other component or it may be in a middle component.

[0024] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0025] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] Please refer to Figure 1 and Figure 5 This invention provides a double-sided display panel 100, including a first substrate 10, a first display component 40, and a second display component 50. The first display component 40 and the second display component 50 are respectively connected to both sides of the first substrate 10 in a first direction Z. The first substrate 10 serves as a common support base and can be a transparent glass substrate or a flexible transparent resin substrate, so that light can pass through the first substrate 10, enabling the first display component 40 and the second display component 50 to share the same light source for display.

[0027] The first display component 40 includes a first display structure 20, and the second display component 50 includes a second display structure 30. The first display structure 20 and the second display structure 30 are respectively connected to two sides of the first substrate 10 in the first direction Z and are opposite to each other in the first direction Z. The first display structure 20 is used to realize the display on one side of the panel, and the second display structure 30 is used to realize the display on the other side of the panel, thereby realizing the double-sided display of the double-sided display panel 100. In this embodiment, for ease of description, the first direction Z is defined as the direction perpendicular to the plane where the first substrate 10 is located.

[0028] For a detailed implementation, please refer to Figure 1 and Figure 5 The first display component 40 includes a second substrate 41 and a plurality of first display structures 20. The second substrate 41 and the first substrate 10 are disposed at a distance from each other in the first direction Z. The plurality of first display structures 20 are arranged in a multi-row, multi-column array between the first substrate 10 and the second substrate 41. The second display component 50 includes a third substrate 51 and a plurality of second display structures 30. The third substrate 51 and the first substrate 10 are disposed at a distance from each other in the first direction Z. The plurality of second display structures 30 are disposed between the first substrate 10 and the third substrate 51 and correspond one-to-one with the plurality of first display structures 20 in the first direction Z.

[0029] Each first display structure 20 corresponds to a sub-pixel of the first display component 40 for emitting monochromatic light, and each second display structure 30 corresponds to a sub-pixel of the second display component 50 for emitting monochromatic light. The first display structure 20 is used to receive external light L0 provided by the external environment or light sources such as lamp beads, lamp strips and lamp boards, and to emit corresponding monochromatic light according to the external light L0. It is also used to transmit the received external light L0 to the corresponding second display structure 30 so that the second display structure 30 emits corresponding monochromatic light, thereby realizing the double-sided display function.

[0030] Specifically, the first display component 40 includes a plurality of first display units 42, which are arranged in a multi-row, multi-column array between the first substrate 10 and the second substrate 41. Each first display unit 42 includes a plurality of first display structures 20. The second display component 50 includes a plurality of second display units 52, which are arranged in a multi-row, multi-column array between the first substrate 10 and the third substrate 51. Each second display unit 52 includes a plurality of second display structures 30, and the plurality of first display units 42 and the plurality of second display units 52 are arranged opposite each other in the first direction Z.

[0031] Each first display unit 42 corresponds to one pixel of the first display component 40. Multiple first display structures 20 within the same first display unit 42 each correspond to multiple sub-pixels of one pixel, and the multiple first display structures 20 within the same first display unit 42 are used to emit light of different colors. Similarly, each second display unit 52 corresponds to one pixel of the second display component 50. Multiple second display structures 30 within the same second display unit 52 each correspond to multiple sub-pixels of one pixel, and the multiple second display structures 30 within the same second display unit 52 are used to emit light of different colors.

[0032] In this configuration, a first display unit 42 and a second display unit 52 facing each other in the first direction Z emit light of the same color. Optionally, a first display structure 20 and a second display structure 30 facing each other in the first direction Z may emit light of the same color, or they may emit light of different colors respectively, without limitation.

[0033] Furthermore, the first substrate 10, multiple first display structures 20, and the second substrate 41 constitute a complete encapsulation structure of the first display unit 42. Similarly, the first substrate 10, multiple second display structures 30, and the third substrate 51 constitute a complete encapsulation structure of the first display unit 42. That is, the first display components 40 and the second display components 50 share the first substrate 10 as their respective common support base, reducing the number of parts in the double-sided display panel 100, increasing the integration of the double-sided display panel 100, and thus reducing assembly difficulty, production costs, and thickness in the first direction Z. The first substrate 10, the second substrate 41, and the third substrate 51 all have the same structure and material composition, which can be referenced without further explanation.

[0034] For a detailed implementation, please refer to Figure 1 and Figure 5 In order to separate adjacent first display structures 20, the first display assembly 40 also includes a plurality of second isolation members 43. The plurality of second isolation members 43 are sequentially and spaced apart between the first substrate 10 and the second substrate 41 along the second direction X, and a first display structure 20 is disposed between any two adjacent second isolation members 43.

[0035] The second isolation member 43 can be a photoresist spacer or a barrier formed by etching. The size of the second isolation member 43 in the first direction Z is equal to the distance between the first substrate 10 and the second substrate 41, so that the second isolation member 43 supports the first substrate 10 and the second substrate 41, thereby providing a stable assembly environment for the first display structure 20 and preventing light crosstalk between adjacent first display nodes. This achieves high-density pixel isolation of the first display component 40 and ensures the display clarity of the first display component 40.

[0036] For a detailed implementation, please refer to Figure 1 and Figure 5 The first display component 40 is a reflective display panel. The first display component 40 is used to reflect external light L0 multiple times in the first display structure 20 so that the outgoing light is emitted out of the first display structure 20 in a direction opposite to the incident direction, thereby realizing the display of the first display component 40.

[0037] Specifically, the first display structure 20 includes a first optical element 21 and a second optical element 22, which are arranged opposite to each other along a second direction X, and the first direction Z intersects the second direction X. In this embodiment, for ease of description, the second direction X is defined as a direction parallel to the first substrate 10. The first optical element 21 is used to receive external light L0 incident from the side of the first display structure 20 away from the second display structure 30, and reflects the external light L0 to the second optical element 22. The second optical element 22 is used to reflect the light from the first optical element 21 and emit it from the first display structure 20, thereby realizing the light emission of the first display structure 20. In addition, the first optical element 21 is also used to transmit external light L0 to the second display structure 30 and emit it from the second display structure 30, so that the second display structure 30 also emits light. This allows the first display structure 20 and the second display structure 30 to display simultaneously under the drive of the same light source.

[0038] For details, please refer to Figures 2 to 4 as well as Figures 6 to 8 The light reflected from the first optical element 21 to the second optical element 22 is configured as the first light ray L1, and the light transmitted through the first optical element 21 to the second display structure 30 is configured as the second light ray L2. The external light ray L0 enters the first optical element 21 from the side of the first display structure 20 away from the second display structure 30. The external light ray L0 is converted into the first light ray L1 by the reflection of the first optical element 21 and enters the second optical element 22. At the same time, it is also converted into the second light ray L2 by the first optical element 21 and transmitted to the second display structure 30. The first light ray L1 is reflected out of the first display structure 20 by the reflection of the second optical element 22. The second display structure 30 receives the second light ray L2 for display.

[0039] In specific embodiments, both the first optical element 21 and the second optical element 22 employ microprism structures or thin-film structures to reduce the size and material cost of the first display structure 20. In this embodiment, both the first optical element 21 and the second optical element 22 employ thin-film structures.

[0040] In a specific embodiment, the angle between the optical surface of the first optical element 21 and the optical surface of the second optical element 22 is 90°, so that the angle between the first ray L1 and the optical surface of the first optical element 21 and the optical surface of the second optical element 22 is 45°, thereby improving the optical path transmission efficiency between the first optical element 21 and the second optical element 22 and reducing the light loss between the first optical element 21 and the second optical element 22.

[0041] Furthermore, the angles between the optical surfaces of the first optical element 21 and the second optical element 22 and the plane containing the first substrate 10 are both 45°. This ensures that the external light ray L0, after being reflected by the first optical element 21 and the second optical element 22, can exit in a direction parallel to the original incident direction. This further reduces light loss during the conversion of the external light ray L0 into the display light of the first display structure 20, thereby improving the display brightness of the first display structure 20. For example, the first optical element 21 reflects the external light ray L0 incident along the first direction Z to the second optical element 22 along the second direction X, i.e., the first light ray L1 propagates along the second direction X. The second optical element 22 then emits the first light ray L1 incident along the second direction X in a direction opposite to the incident direction, thus achieving a 180° turn in the light path and ensuring the uniformity and brightness of the emitted light from the first display structure 20.

[0042] For a detailed implementation, please refer to Figures 2 to 4 as well as Figures 6 to 8 The first optical element 21 and the second optical element 22 have the same optical characteristics. The second optical element 22 is also used to receive external light L0 and reflect it back to the first optical element 21. The first optical element 21 is used to reflect the light from the second optical element 22 out of the first display structure 20. The second optical element 22 is also used to transmit the external light L0 to the second display structure 30. This arrangement allows the external light L0 to exit the first display structure 20 through reflection by both the first optical element 21 and the second optical element 22, and simultaneously transmit it to the second display structure 30, thus improving the aperture ratio and light energy utilization of both the first display structure 20 and the second display structure 30.

[0043] The double-sided display panel 100 provided by the present invention achieves double-sided display function by setting a first display structure 20 and a second display structure 30 on both sides of a first substrate 10. The first display structure 20 includes a first optical element 21 and a second optical element 22 arranged opposite to each other. The first optical element 21 reflects a portion of the external light L0 to the second optical element 22 and then exits from the first display structure 20, while the other portion is transmitted to the second display structure 30 and then exits from the second display structure 30. This reduces the number of optical elements in the double-sided display panel 100, thereby simplifying the overall optical architecture of the double-sided display panel 100 and reducing the assembly difficulty and production cost of the double-sided display panel 100.

[0044] For a detailed implementation, please refer to Figure 1 and Figure 5The first display structure 20 also includes a third optical element 23, which is disposed between the first optical element 21 and the second optical element 22. The third optical element 23 is used to switch between a transparent state and a non-transparent state.

[0045] Please refer to Figure 2 , Figure 4 , Figure 6 and Figure 8 When the third optical element 23 is in a transparent state, light can freely pass through the area between the first optical element 21 and the second optical element 22, so that the external light L0 can be emitted from the first display structure 20 through two reflections inside the first display structure 20, thereby realizing the display of the first display structure 20.

[0046] Please refer to Figure 3 and Figure 7 When the third optical element 23 is in a non-transparent state such as black or scattering state, the third optical element 23 blocks the propagation of light between the first optical element 21 and the second optical element 22, thereby turning off the light output of the first display structure 20. At this time, the first display structure 20 is in a non-display state.

[0047] Furthermore, the multiple first display structures 20 within the first display component 40 can be in a light-emitting state and a non-display state under the control of their respective third optical elements 23, thereby enabling the first display component 40 to display all, partially, or not display at all.

[0048] In a specific embodiment, the third optical element 23 includes a control electrode layer 24 and an electrochromic layer 25 sequentially stacked on the first substrate 10. The control electrode layer 24 is used to apply a voltage to the electrochromic layer 25 so that the electrochromic layer 25 switches between a transparent state and a non-transparent state.

[0049] The control electrode layer 24 can be covered on the first substrate 10 by a transparent conductive material such as ITO and formed by etching and other processes to ensure the precise connection between the multiple control electrode layers 24 and the multiple electrochromic layers 25.

[0050] The electrochromic layer 25 can be made of materials such as tungsten oxide, nickel oxide, or conductive polymer. When the control electrode layer 24 does not apply voltage to the electrochromic layer 25, the electrochromic layer 25 is in a transparent state. When the control electrode layer 24 applies a positive or reverse voltage to the electrochromic layer 25, the electrochromic layer 25 undergoes an oxidation-reduction reaction, which makes the color of the electrochromic layer 25 darken, thereby changing from a transparent state to an opaque state.

[0051] Furthermore, the first display structure 20 also includes a first isolator 26, which is disposed on the side of the third optical element 23 away from the first substrate 10. In the orthographic projection in the first direction Z, the projection of the third optical element 23 is located within the projection of the first isolator 26. The material of the first isolator 26 is the same as that of the aforementioned second isolator 43. Alternatively, the first isolator 26 may be made of a black matrix material or a metal light-shielding layer to prevent light passing through the electrochromic layer 25 from leaking out from the side of the electrochromic layer 25 away from the first substrate 10, thereby improving the optical isolation performance of the third optical element 23 and the display contrast of the first display structure 20.

[0052] For a detailed implementation, please refer to Figure 1 and Figure 5 The second display component 50 is a liquid crystal panel. Specifically, the second display structure 30 includes an array substrate layer 31, a liquid crystal layer 32, and a first polarizer 33, which are sequentially stacked on the first substrate 10. The array substrate layer 31 is used to apply a voltage to the liquid crystal layer 32 to control the flipping of the liquid crystal inside the liquid crystal layer 32, thereby changing the polarization direction of the light passing through the liquid crystal. This allows the outgoing light passing through the liquid crystal to pass through or be absorbed by the first polarizer 33, thereby enabling the second display structure 30 to switch between a display mode and a non-display mode.

[0053] The liquid crystal layer 32 is used to receive the second light L2 and convert the second light L2 into a third light L3 which is emitted to the first polarizer 33. The polarization direction of the third light L3 is controlled by the liquid crystal layer 32 to be the same as or orthogonal to the transmission axis direction of the first polarizer 33.

[0054] Please refer to Figure 3 , Figure 4 , Figure 7 and Figure 8 When the polarization direction of the third ray L3 is the same as the transmission axis direction of the first polarizer 33, the third ray L3 can pass through the first polarizer 33 and be emitted from the second display structure 30, thereby realizing the display of the second display structure 30.

[0055] Please refer to Figure 2 and Figure 6 When the polarization direction of the third light ray L3 is orthogonal to the transmission axis direction of the first polarizer 33, the third light ray L3 is absorbed by the first polarizer 33, thereby turning off the light output of the second display structure 30. At this time, the second display structure 30 is in a non-display state.

[0056] Optionally, the first polarizer 33 can be disposed on the surface of the third substrate 51 facing away from the first substrate 10, or it can be disposed between the liquid crystal layer 32 and the third substrate 51, without limitation. In this embodiment, the first polarizer 33 is disposed on the surface of the third substrate 51 facing away from the first substrate 10.

[0057] Furthermore, the multiple second display structures 30 located in the same second display unit 52 all share the same array substrate layer 31, liquid crystal layer 32, and first polarizer 33 to simplify the structure of the second display assembly 50 and improve the aperture ratio of the second display assembly 50. The multiple second display structures 30 within the second display assembly 50 can be in a light-emitting state and a non-display state under the control of their respective liquid crystal layers 32, thereby enabling the second display assembly 50 to display all, partially, or not display at all. This allows the double-sided display panel 100 to switch between three operating modes: displaying on both sides, displaying on either side, and not displaying on either side.

[0058] For a detailed implementation, please refer to Figure 1 and Figure 5 The second display structure 30 also includes a second color resist 34, which is opposite to the first optical element 21 in the first direction Z, so that when light from the first optical element 21 passes through the second color resist 34, light in a specific band of the transmission spectrum range of the second color resist 34 can be emitted from the second display structure 30, so that the second display structure 30 emits light of a specific color.

[0059] In this second display unit 52, the transmission spectrum ranges of the second color resists 34 of the multiple second display structures 30 are different, and a black matrix material is provided between the second color resists 34 of two adjacent second display structures 30 to avoid crosstalk between two adjacent second display structures 30, thereby improving the display contrast of the second display component 50.

[0060] Optionally, the second color resist 34 is disposed between the liquid crystal layer 32 and the third substrate 51, or it can be disposed on the side of the liquid crystal layer 32 facing away from the third substrate 51, without limitation. In this embodiment, the second color resist 34 is disposed between the liquid crystal layer 32 and the third substrate 51. Optionally, when the first optical element 21 and the second optical element 22 have the same optical characteristics, the second color resist 34 is opposite to both the first optical element 21 and the second optical element 22 in the first direction Z, so as to improve the aperture ratio of the second display component 50.

[0061] In one implementation method, please refer to Figures 1 to 4 The first optical element 21 is a semi-reflective and semi-transparent element, specifically a wire grid polarizer or a polymer-dispersed liquid crystal polarizing beam splitter. The first optical element 21 has selective reflection and transmission characteristics for light rays with different polarization directions, so that the polarization directions of the first light ray L1 and the second light ray L2 are different.

[0062] Specifically, the first optical element 21 is used to reflect the light rays L0 whose polarization direction is the same as the reflection axis direction of the first optical element 21 to the second optical element 22. That is, the polarization direction of the first light ray L1 is orthogonal to the transmission axis direction of the first optical element 21 and is also the same as the reflection axis direction of the first optical element 21. The first optical element 21 is also used to transmit the light rays L0 whose polarization direction is the same as the transmission axis direction of the first optical element 21 to the second display structure 30. That is, the polarization direction of the second light ray L2 is the same as the transmission axis direction of the first optical element 21 and is also orthogonal to the reflection axis direction of the first optical element 21.

[0063] In this embodiment, the transmission axis direction of the first polarizer 33 is orthogonal to the transmission axis direction of the first optical element 21, that is, the transmission axis direction of the first polarizer 33 is orthogonal to the polarization direction of the second light L2. The second light L2 is converted into a third light L3 through the liquid crystal layer 32 and enters the first polarizer 33.

[0064] Please refer to Figure 2 When the liquid crystal layer 32 does not change the polarization direction of the second light L2, that is, the polarization directions of the second light L2 and the third light L3 are the same, and the polarization direction of the third light L3 is orthogonal to the transmission axis direction of the first polarizer 33, the third light L3 is absorbed by the first polarizer 33, thereby turning off the light output of the second display structure 30. At this time, the second display structure 30 is in a non-display state.

[0065] Please refer to Figure 3 and Figure 4 When the liquid crystal layer 32 changes the polarization direction of the second light L2 so that the polarization directions of the second light L2 and the third light L3 are orthogonal, that is, when the polarization direction of the third light L3 is the same as the transmission axis direction of the first polarizer 33, the third light L3 can pass through the first polarizer 33 and be emitted from the second display structure 30, thereby realizing the display of the second display structure 30.

[0066] For example, if the transmission axis of the first optical element 21 is 0° and the reflection axis is 90°, then the transmission axis of the first polarizer 33 is 90°, the polarization direction of the first ray L1 is 0°, the polarization direction of the second ray L2 is 90°, and the polarization direction of the third ray L3 is either 0° or 90°.

[0067] In this embodiment, the first display structure 20 further includes a first color filter 27, which is opposite to at least one of the first optical element 21 and the second optical element 22 in the first direction Z, such that light in a specific band of the transmission spectrum range of the first color filter 27 can be emitted from the first display structure 20, so that the first display structure 20 emits light of a specific color.

[0068] The transmission spectral range of the first color resist 27 overlaps or at least partially does not overlap with the transmission spectral range of the second color resist 34. When the transmission spectral range of the first color resist 27 overlaps with the transmission spectral range of the second color resist 34, the first display structure 20 and the second display structure 30, which are disposed opposite to each other in the first direction Z, are used to emit light of the same color. When the transmission spectral range of the first color resist 27 and the second color resist 34, which at least partially do not overlap, the first display structure 20 and the second display structure 30, which are disposed opposite to each other in the first direction Z, are used to emit light of different colors.

[0069] In another implementation method, please refer to Figures 5 to 8 The first optical element 21 is a dichroic filter element. The first optical element 21 is used to selectively reflect and transmit light of different wavelengths through interference effect, so that the wavelength ranges of the first light L1 and the second light L2 are different.

[0070] Specifically, the first optical element 21 is used to reflect light in the external light L0 that is within the reflection spectrum range of the first optical element 21 to the second optical element 22, and is also used to transmit light in the external light L0 that is outside the reflection spectrum range of the first optical element 21 to the second display structure 30.

[0071] In this embodiment, the reflection spectrum range of the first optical element 21 and the transmission spectrum range of the second color filter 34 do not overlap at least partially, so that the first display structure 20 and the second display structure 30, which are disposed opposite to each other in the first direction Z, are used to emit light of different colors.

[0072] In this embodiment, the second display structure 30 further includes a second polarizer 35. The second polarizer 35, the liquid crystal layer 32, and the first polarizer 33 are sequentially stacked on the first substrate 10. The transmission axis directions of the first polarizer 33 and the second polarizer 35 are orthogonal. The second polarizer 35 is used to receive the second light L2 and convert the second light L2 into a fourth light L4 which is emitted to the liquid crystal layer 32. The liquid crystal layer 32 is used to convert the fourth light L4 into a third light L3 which is emitted to the first polarizer 33. The polarization direction of the third light L3 is the same as or orthogonal to the transmission axis direction of the first polarizer 33.

[0073] Among them, the second ray L2 whose polarization direction is the same as the transmission axis direction of the second polarizer 35 can pass through the second polarizer 35 and be converted into the fourth ray L4. That is, the polarization direction of the fourth ray L4 is the same as the transmission axis direction of the second polarizer 35, and the transmission axis direction of the first polarizer 33 is orthogonal.

[0074] Please refer to Figure 6When the liquid crystal layer 32 does not change the polarization direction of the fourth light L4, that is, when the polarization direction of the fourth light L4 and the third light L3 are the same, and the polarization direction of the third light L3 is orthogonal to the transmission axis direction of the first polarizer 33, the third light L3 is absorbed by the first polarizer 33, thereby turning off the light output of the second display structure 30. At this time, the second display structure 30 is in a non-display state.

[0075] Please refer to Figure 7 and Figure 8 When the liquid crystal layer 32 changes the polarization direction of the fourth light L4 so that the polarization directions of the fourth light L4 and the third light L3 are orthogonal, that is, when the polarization direction of the third light L3 is the same as the transmission axis direction of the first polarizer 33, the third light L3 can pass through the first polarizer 33 and be emitted from the second display structure 30, thereby realizing the display of the second display structure 30.

[0076] For example, taking the transmission axis direction of the first polarizer 33 as 90° and the transmission axis direction of the second polarizer 35 as 0°, the polarization direction of the fourth ray L4 is 0°, and the polarization direction of the third ray L3 is 0° or 90°.

[0077] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other indicators are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0078] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A double-sided display panel, characterized in that, The device includes a first substrate, a first display structure, and a second display structure. The first display structure and the second display structure are respectively connected to two sides of the first substrate in a first direction and are opposite to each other in the first direction. The first display structure includes a first optical element and a second optical element, which are disposed opposite to each other along a second direction. The first direction and the second direction intersect. The first optical element is used to receive external light rays incident from the side of the first display structure facing away from the second display structure, and to reflect the external light rays to the second optical element. The second optical element is used to reflect the light rays from the first optical element and to exit from the first display structure. The first optical element is also used to transmit the external light to the second display structure and to exit from the second display structure; The angle between the optical surface of the first optical element and the optical surface of the second optical element is 90°, and the angle between the optical surface of the first optical element and the optical surface of the second optical element and the plane on which the first substrate is located is 45°. The first display structure further includes a third optical element, which is disposed between the first optical element and the second optical element, and is used to switch between a transparent state and a non-transparent state.

2. The double-sided display panel according to claim 1, characterized in that, The first optical element is a semi-reflective and semi-transparent element. The light reflected from the first optical element to the second optical element is configured as a first light ray, and the light transmitted through the first optical element to the second display structure is configured as a second light ray. The polarization directions of the first light ray and the second light ray are different.

3. The double-sided display panel according to claim 2, characterized in that, The second display structure includes a liquid crystal layer and a first polarizer stacked sequentially on the first substrate. The transmission axis of the first polarizer is orthogonal to the transmission axis of the first optical element. The liquid crystal layer is used to receive the second light and convert the second light into a third light that is emitted to the first polarizer. The polarization direction of the third light is the same as or orthogonal to the transmission axis of the first polarizer.

4. The double-sided display panel according to claim 2, characterized in that, The first display structure further includes a first color resist, and the second display structure includes a second color resist. The first color resist is opposite to at least one of the first optical element and the second optical element in the first direction, and the second color resist is opposite to the first optical element in the first direction. The transmission spectral range of the first color resist and the transmission spectral range of the second color resist overlap or at least partially do not overlap.

5. The double-sided display panel according to claim 1, characterized in that, The first optical element is a dichroic filter element. The light reflected from the first optical element to the second optical element is configured as a first light, and the light transmitted through the first optical element to the second display structure is configured as a second light. The wavelength ranges of the first light and the second light are different.

6. The double-sided display panel according to claim 5, characterized in that, The second display structure includes a second color resist, which is opposite to the first optical element in the first direction, and the reflection spectrum range of the first optical element and the transmission spectrum range of the second color resist do not overlap at least partially.

7. The double-sided display panel according to claim 5, characterized in that, The second display structure includes a second polarizer, a liquid crystal layer, and a first polarizer stacked sequentially on the first substrate. The transmission axis of the first polarizer is orthogonal to that of the second polarizer. The second polarizer is used to receive the second light and convert the second light into a fourth light that is emitted to the liquid crystal layer. The liquid crystal layer is used to convert the fourth light into a third light that is emitted to the first polarizer. The polarization direction of the third light is the same as or orthogonal to the transmission axis of the first polarizer.

8. The double-sided display panel according to claim 1, characterized in that, The first optical element and the second optical element have the same optical properties; the second optical element is also used to receive external light and reflect the external light to the first optical element, the first optical element is used to reflect the light from the second optical element out of the first display structure; the second optical element is also used to transmit the external light to the second display structure.

9. The double-sided display panel according to claim 1, characterized in that, The third optical element includes a control electrode layer and an electrochromic layer stacked sequentially on the first substrate. The control electrode layer is used to apply a voltage to the electrochromic layer to switch the electrochromic layer between a transparent state and a non-transparent state.

10. The double-sided display panel according to claim 1, characterized in that, The first display structure further includes a first isolator, which is disposed on the side of the third optical element away from the first substrate. In the orthographic projection in the first direction, the projection of the third optical element is located within the projection of the first isolator.

11. The double-sided display panel according to any one of claims 1-10, characterized in that, The dual-sided display panel includes a first display component and a second display component; The first display component includes a second substrate and a plurality of first display structures. The second substrate and the first substrate are disposed at a distance from each other in the first direction. The plurality of first display structures are arranged in a multi-row, multi-column array between the first substrate and the second substrate. The second display component includes a third substrate and a plurality of second display structures. The third substrate and the first substrate are disposed at a distance from each other in the first direction. The plurality of second display structures are disposed between the first substrate and the third substrate and correspond one-to-one with the plurality of first display structures in the first direction.

12. The double-sided display panel according to claim 11, characterized in that, The first display component further includes a plurality of second isolation members, which are sequentially and spaced apart between the first substrate and the second substrate along the second direction, and a first display structure is disposed between any two adjacent second isolation members.

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