Transparent display panel and electronic device

Abstract

The embodiments of the present disclosure provide a transparent display panel and an electronic device. The transparent display panel includes: a first substrate, a second substrate, and a liquid crystal layer located between the first substrate and the second substrate, the second substrate having an edge extension, the edge extension of the second substrate and the first light incident surface of the first substrate are located on the same side of the transparent display panel, and the orthographic projection of the first substrate on the surface of the second substrate facing the first substrate does not overlap with the edge extension; a first light source assembly, the first light source assembly is located on the side of the first substrate provided with the first light incident surface; a second light source assembly; and a first light guide bar, the first light guide bar is located between the first light source assembly and the first light incident surface, the first light guide bar has a first light guide bar surface and a second light guide bar surface and a first light guide bar slope surface located between the first light guide bar surface and the second light guide bar surface, and the internal angle formed between the first light guide bar slope surface and the second light guide bar surface is less than or equal to 90 degrees.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a transparent display panel and an electronic device including the transparent display panel. Background Art

[0002] Transparent display is a technology with a wide demand. It can be used in applications such as in-vehicle display, window display, home display, wearable display, etc., which require both displaying images and seeing the scenery behind the screen. Transparent display can be achieved with the help of a liquid crystal layer in the form of a composite film layer of polymer and liquid crystal (such as polymer network stabilized liquid crystal (PSLC) or polymer dispersed liquid crystal (PDLC)). When the transparent display screen needs to display, a voltage is applied to the display area of ​​the liquid crystal layer, causing the liquid crystal to deflect and scatter light to achieve the display function. When the screen does not need to display, no voltage is applied to both sides of the liquid crystal layer. This panel usually includes a structure of two substrates and a liquid crystal layer sandwiched between the two substrates. Summary of the invention

[0003] An embodiment of the present disclosure provides a transparent display panel, comprising: a first substrate, a second substrate, and a liquid crystal layer located between the first substrate and the second substrate, wherein the first substrate has a first display surface facing away from the second substrate, a first surface facing the second substrate, and a first light incident surface located between the first display surface and the first surface, the second substrate has an edge extension, the edge extension of the second substrate and the first light incident surface of the first substrate are located on the same side of the transparent display panel, and the orthographic projection of the first substrate on the surface of the second substrate facing the first substrate does not overlap with the edge extension, wherein the transparent display panel further comprises: a first light source assembly, the first light source assembly is located on a side of the first substrate where the first light incident surface is provided; a second light source assembly, the second light source assembly is located on the other side of the first substrate opposite to the first light source assembly; and a first light guide bar, the first light guide bar is located between the first light source assembly and the first light incident surface, the first light guide bar has a first light guide bar surface facing the first light incident surface, a second light guide bar surface facing away from the first light incident surface, and a first light guide bar slope surface located between the first light guide bar surface and the second light guide bar surface, and the inner angle formed between the first light guide bar slope surface and the second light guide bar surface is less than or equal to 90 degrees.

[0004] In some embodiments, the transparent display panel also includes: a fixing frame for fixing the first light guide strip to the first substrate and the second substrate, the fixing frame including a positioning surface that cooperates with the first light guide strip slope surface of the first light guide strip, and the positioning surface and the first light guide strip slope surface are inclined surfaces with the same inclination angle.

[0005] In some embodiments, the fixing frame further comprises a light source fixing portion for fixing the first light source assembly, the light source fixing portion is provided with a groove for accommodating the first light source assembly, and the groove is arranged toward the second light guide bar surface of the first light guide bar.

[0006] In some embodiments, an area of ​​the surface of the second light guide bar is greater than an area of ​​the surface of the first light guide bar.

[0007] In some embodiments, the first light guide bar has a third light guide bar surface facing the second substrate, the second substrate has a second light incident surface facing the third light guide bar surface, and the second light incident surface is used to receive light emitted from the third light guide bar surface.

[0008] In some embodiments, the surface of the first light guide strip contacts the first light incident surface of the first substrate, a glass chip-on-chip package and a thin film chip-on-chip package are provided on the second light incident surface, and the surface of the third light guide strip contacts the glass chip-on-chip package on the second light incident surface of the second substrate.

[0009] In some embodiments, the transparent display panel further includes a frame sealant, which is located between the first substrate and the second substrate and at the periphery of the liquid crystal layer for sealing the liquid crystal layer, and a gap is provided between the surface of the first light guide strip and the frame sealant.

[0010] In some embodiments, the distance between the first light guide bar surface and the second light guide bar surface is equal to the length difference between the second substrate and the first substrate in a direction perpendicular to the first light incident surface.

[0011] In some embodiments, a width of the first light guide strip surface in a direction perpendicular to the first display surface of the first substrate is less than or equal to a sum of thicknesses of the first substrate and the liquid crystal layer in a direction perpendicular to the first display surface of the first substrate.

[0012] In some embodiments, the first light source assembly is arranged to face the second light guide bar surface of the first light guide bar and the width of the first light source assembly in a direction perpendicular to the first display surface of the first substrate is less than or equal to the width of the second light guide bar surface in a direction perpendicular to the first display surface of the first substrate.

[0013] In some embodiments, the inner angle formed between the slope surface of the first light guide strip and the surface of the second light guide strip is greater than 70 degrees.

[0014] In some embodiments, the inner angle formed between the slope surface of the first light guide strip and the surface of the second light guide strip is greater than 84.5 degrees.

[0015] In some embodiments, the first substrate also includes a third light incident surface, which is arranged on a side of the first substrate opposite to the first light incident surface, the second substrate also includes a fourth light incident surface, and the fourth light incident surface and the third light incident surface are located on the same side of the transparent display panel; and the second light source assembly and the third light incident surface and the fourth light incident surface are arranged on the same side of the transparent display panel; wherein the transparent display panel also includes: a second light guide bar, the second light guide bar is located on a side of the second light source assembly facing the third light incident surface and the fourth light incident surface and on a side of the third light incident surface and the fourth light incident surface facing the second light source assembly, the second light guide bar has a fourth light guide bar surface facing the third light incident surface and the fourth light incident surface, a fifth light guide bar surface away from the third light incident surface and the fourth light incident surface, and a second light guide bar slope surface located between the fourth light guide bar surface and the fifth light guide bar surface, and the inner angle formed between the second light guide bar slope surface and the fifth light guide bar surface is less than or equal to 90 degrees.

[0016] In some embodiments, the width of the surface of the fourth light guide strip in the direction perpendicular to the first display surface is less than or equal to the sum of the thicknesses of the first substrate, the second substrate and the liquid crystal layer in the direction perpendicular to the first display surface.

[0017] In some embodiments, the surface of the fourth light guide bar is in contact with the third light incident surface and the fourth light incident surface.

[0018] In some embodiments, the width of the second light source assembly in a direction perpendicular to the first display surface is greater than the sum of the thicknesses of the first substrate, the second substrate and the liquid crystal layer in a direction perpendicular to the first display surface and is less than or equal to the width of the surface of the fifth light guide strip in a direction perpendicular to the first display surface.

[0019] In some embodiments, the first light guide bar, the second light guide bar, the first substrate and the second substrate have the same refractive index.

[0020] In some embodiments, each of the first light source assembly and the second light source assembly includes: a carrier board; a plurality of light emitting diode chips, wherein the plurality of light emitting diode chips include light emitting diode chips of multiple colors arranged on a side of the carrier board facing the first substrate.

[0021] In some embodiments, a gap of 0.5 to 2 mm is provided between the first light source assembly and the second light guide bar surface of the first light guide bar, and a gap of 0.5 to 2 mm is provided between the second light source assembly and the fifth light guide bar surface of the second light guide bar.

[0022] In some embodiments, the transparent display panel also includes: a first electrode layer, the first electrode layer is located between the liquid crystal layer and the first substrate in a direction perpendicular to the first display surface; a second electrode layer, the second electrode layer is located between the liquid crystal layer and the second substrate in a direction perpendicular to the first display surface; a first orientation layer, located on a side of the liquid crystal layer facing the first electrode layer; and a second orientation layer, located on a side of the liquid crystal layer facing the second electrode layer, wherein the first electrode layer and the second electrode layer are configured to control the liquid crystal layer to switch between a light transmitting state and at least one light scattering state.

[0023] In some embodiments, the inner angle formed between the slope surface of the second light guide strip and the surface of the fifth light guide strip is greater than 84.5 degrees.

[0024] An embodiment of the present disclosure provides a transparent display panel, comprising: a first substrate and a second substrate; a liquid crystal layer located between the first substrate and the second substrate; a light guide plate, the light guide plate being located on a side of the first substrate or the second substrate away from the liquid crystal layer, the light guide plate having a first light guide plate surface away from the liquid crystal layer, a second light guide plate surface facing the liquid crystal layer, and a fifth light incident surface located between the first light guide plate surface and the second light guide plate surface; a first light source assembly, the first light source assembly being located on a side of the light guide plate provided with the fifth light incident surface; and a first light guide bar, the first light guide bar being located between the first light source assembly and the fifth light incident surface, the first light guide bar having a first light guide bar surface facing the fifth light incident surface, a second light guide bar surface away from the fifth light incident surface, and a first light guide bar slope surface located between the first light guide bar surface and the second light guide bar surface, the inner angle formed between the first light guide bar slope surface and the second light guide bar surface being less than or equal to 90 degrees.

[0025] In some embodiments, the transparent display panel further includes: a refractive index matching layer, which is arranged on the surface of the light guide plate facing the liquid crystal layer, and the refractive index of the refractive index matching layer is lower than the refractive index of the light guide plate and the refractive index of the first substrate and the refractive index of the second substrate.

[0026] In some embodiments, the transparent display panel further includes: a fixing frame for fixing the first light guide strip, the fixing frame including a positioning surface that matches the first light guide strip slope of the first light guide strip, the positioning surface and the first light guide strip slope are inclined surfaces with the same inclination angle.

[0027] In some embodiments, the fixing frame further comprises a light source fixing portion for fixing the first light source assembly, the light source fixing portion is provided with a groove for accommodating the first light source assembly, and the groove is arranged toward the second light guide bar surface of the first light guide bar.

[0028] In some embodiments, the second substrate has an edge extension, the edge extension of the second substrate and the first light source assembly are located on the same side of the transparent display panel, and the orthographic projection of the first substrate on a surface of the second substrate facing the first substrate does not overlap with the edge extension.

[0029] In some embodiments, the light guide plate is located on a side of the first substrate away from the liquid crystal layer, and a width of the first light guide strip surface in a direction perpendicular to the surface of the first light guide plate is equal to or greater than a thickness of the light guide plate.

[0030] In some embodiments, the width of the surface of the first light guide bar in a direction perpendicular to the surface of the first light guide plate is equal to the sum of the thicknesses of the light guide plate, the refractive index matching layer, the first substrate and the liquid crystal layer.

[0031] In some embodiments, the light guide plate is located on a side of the second substrate away from the liquid crystal layer, and a width of the first light guide strip surface in a direction perpendicular to the surface of the first light guide plate is equal to or greater than a thickness of the light guide plate.

[0032] In some embodiments, the width of the surface of the first light guide bar in a direction perpendicular to the surface of the first light guide plate is equal to the sum of the thicknesses of the light guide plate, the refractive index matching layer, and the second substrate.

[0033] In some embodiments, the first light guide bar further includes a third light guide bar surface located on the opposite side of the first light guide bar slope surface, and an internal angle formed between the third light guide bar surface and the second light guide bar surface is less than or equal to 90 degrees.

[0034] In some embodiments, an area of ​​the surface of the second light guide bar is greater than an area of ​​the surface of the first light guide bar.

[0035] An embodiment of the present disclosure further provides an electronic device, comprising the transparent display panel according to any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It should be noted that the drawings described below only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure, wherein:

[0037] Figure 1 A perspective schematic diagram showing a transparent display panel according to some embodiments of the present disclosure;

[0038] Figure 2 Show Figure 1 A schematic side view of a transparent display panel shown in ;

[0039] Figure 3 A schematic structural diagram of a transparent display panel according to some embodiments of the present disclosure is shown;

[0040] Figure 4 A three-dimensional schematic diagram showing a transparent display panel according to some other embodiments of the present disclosure;

[0041] Figure 5 Show Figure 4 A schematic side view of a transparent display panel shown in ;

[0042] Figure 6 Schematically showing a film layer structure diagram of a transparent display panel according to some embodiments of the present disclosure;

[0043] Figure 7 A schematic plan view schematically shows a display side of a transparent display panel according to an embodiment of the present disclosure;

[0044] Figure 8 A plan view schematically illustrates a light source assembly in a transparent display panel according to an embodiment of the present disclosure;

[0045] Fig. 9 A schematic diagram schematically illustrating a transparent display panel according to some further embodiments of the present disclosure; and

[0046] Fig.10 A schematic diagram schematically showing a transparent display panel according to some further embodiments of the present disclosure;

[0047] Fig.11 A schematic diagram schematically illustrates a transparent display panel according to some further embodiments of the present disclosure;

[0048] Fig.12 A schematic diagram schematically showing a transparent display panel according to some further embodiments of the present disclosure;

[0049] Fig.13 A schematic diagram schematically illustrating a transparent display panel according to some further embodiments of the present disclosure; and

[0050] Fig.14 A schematic diagram schematically showing a transparent display panel according to some further embodiments of the present disclosure;

[0051] Fig.15 Schematic diagrams schematically showing transparent display panels according to other embodiments of the present disclosure;

[0052] Fig.16 A schematic diagram schematically illustrating a transparent display panel according to some further embodiments of the present disclosure; and

[0053] Fig.17Schematic diagrams schematically illustrate transparent display panels according to some further embodiments of the present disclosure. DETAILED DESCRIPTION

[0054] In order to more clearly explain the purpose, technical solutions and advantages of the present disclosure, the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the following description of the embodiments is intended to explain and illustrate the overall concept of the present disclosure and should not be understood as a limitation of the present disclosure. In the specification and the drawings, the same or similar reference numerals refer to the same or similar parts or components. For the sake of clarity, the drawings are not necessarily drawn to scale, and some well-known parts and structures may be omitted in the drawings.

[0055] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. The wording "one" or "an" does not exclude multiple. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right", "top" or "bottom" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. When an element such as a layer, a film, a region or a substrate substrate is referred to as being "on" or "under" another element, the element may be "directly" located "on" or "under" another element, or there may be an intermediate element.

[0056] The embodiment of the present disclosure discloses a transparent display panel 100. Figure 1 and Figure 2 As shown, the transparent display panel 100 includes a first substrate 10, a second substrate 20, and a liquid crystal layer 30 located between the first substrate 10 and the second substrate 20. The first substrate 10 has a first display surface 11 away from the second substrate 20, a first surface 12 facing the second substrate 20, and a first light incident surface 13 located between the first display surface 11 and the first surface 12.

[0057] The transparent display panel is different from the liquid crystal display panel used in conventional liquid crystal displays. Conventional liquid crystal display panels use electrodes to apply voltage to the liquid crystal layer to change the influence of the liquid crystal layer on the polarization direction of polarized light, and detect the state of the emitted polarized light through an analyzer (usually formed by a polarizer) located on the light-emitting side of the liquid crystal layer (polarized light with different polarization directions corresponds to different transmittances of the analyzer), thereby realizing image display. Therefore, in conventional liquid crystal displays, the polarizers on both sides of the liquid crystal layer (one is a polarizer and the other is an analyzer) are indispensable components.

[0058] The transparent display panel 100 according to the present disclosure adopts an edge-type light source. Figure 2 As shown, light source assemblies (for example, including a first light source assembly 41 and a second light source assembly 42) are respectively arranged on the upper side and the lower side of the transparent display panel 100, and the first substrate (for example, a cover substrate arranged opposite to the array substrate) 10 and the second substrate (for example, an array substrate) 20 can be regarded as similar to a light guide. After entering the first substrate 10 or the second substrate 20, the light emitted from the light source assembly can be reflected back and forth between the first display surface 11 of the first substrate 10 and the surface of the second substrate 20 facing away from the first substrate 10 (hereinafter referred to as the second surface 21). In order to improve the optical efficiency, the incident angle of most of the light entering the first substrate 10 or the second substrate 20 at the first display surface 11 of the first substrate 10 and the second surface 21 of the second substrate 20 can be made greater than the critical angle of total reflection to achieve total reflection. The liquid crystal layer 30 can generate a transmission state and at least one scattering state under the action of voltage. In the transmission state, the liquid crystal layer 30 can allow light to be transmitted through, so that the light can still be reciprocated between the first display surface 11 of the first substrate 10 and the second surface 21 of the second substrate 20 after passing through the liquid crystal layer 30. In the scattering state, the liquid crystal layer 30 can scatter light, thereby changing the traveling direction of the light. Thus, after the light passes through the liquid crystal layer 30 in such a state, a considerable amount of light no longer satisfies the total reflection condition at the first display surface 11 of the first substrate 10 and the second surface 21 of the second substrate 20, and can be emitted from the first substrate 10 or the second substrate 20. The liquid crystal layer 30 may include, for example, a polymer network stabilized liquid crystal. It should be noted that although Figure 1 In the embodiment of the present disclosure shown in FIG. 1 , two light source assemblies are shown, however, the embodiment of the present disclosure is not limited thereto, for example, the transparent display panel 100 may also have only one light source assembly, for example, the first light source assembly 41. In the embodiment of the present disclosure, the first display surface 11 is the main display surface for displaying an image, however, the image may also be observed from the second surface 21 of the second substrate 20.

[0059] In some embodiments, the liquid crystal layer 30 may be in the form of a composite film layer of polymers and liquid crystals, for example, made of polymer network stabilized liquid crystal (PSLC) or polymer dispersed liquid crystal (PDLC) material. Polymer network stabilized liquid crystal material is an optoelectronic composite material in which a small amount of polymer forms a network to stabilize the orientation of liquid crystals. Due to the different arrangement orientations of liquid crystal molecules in the polymer network, the refractive index changes. When no electric field is applied, the polymer network stabilized liquid crystal material is transparent (i.e., light transmission state). After applying an appropriate electric field, due to the anchoring effect between the polymer network and the liquid crystal, part of the liquid crystal will be restricted from reorienting in the electric field, causing the liquid crystal molecules to be arranged in a disordered manner, showing different refractive indices, and scattering the incident light (i.e., the polymer network stabilized liquid crystal material is in a light scattering state). The above characteristics of the polymer network stabilized liquid crystal material can be used in the above liquid crystal layer 30 to display images.

[0060] As an example, a liquid crystal component based on a polymer network stabilized liquid crystal material can be formed by injecting ordinary liquid crystal molecules and polymerizable liquid crystal monomers into a liquid crystal box and then irradiating it with ultraviolet light to form a polymer network. Under the influence of the polymer network, the liquid crystal response speed can reach about 1 millisecond, for example.

[0061] The polymer dispersed liquid crystal (PDLC) material is formed by dispersing liquid crystal in the form of droplets (e.g., micrometer-level) in an organic solid polymer matrix; specifically, the liquid crystal layer 30 in the form of a polymer film layer made of PDLC is prepared, for example, by dispersing the liquid crystal molecules in the form of droplets in which the optical axis is randomly arranged in the form of droplets in the organic solid polymer matrix contained in the liquid crystal layer. In addition, since the respective optical axes of the droplets composed of liquid crystal molecules are in a free orientation or random orientation when no electric field is applied, the refractive index of the liquid crystal molecules does not match the refractive index of the polymer matrix, resulting in that when the light incident into the polymer dispersed liquid crystal material passes through its polymer matrix, it is scattered in all directions by the droplets dispersed in the polymer matrix, and thus the polymer dispersed liquid crystal material is in an opaque state or a semi-transparent state (i.e., a light scattering state) for the light incident therein. When an electric field is applied to the polymer dispersed liquid crystal material, the optical axis orientation of the liquid crystal droplets can be adjusted to be oriented along the applied electric field. When the refractive index of the liquid crystal molecules matches the refractive index of the polymer matrix, the light incident into the polymer dispersed liquid crystal material is transmitted through the polymer matrix (rather than being scattered by the droplets dispersed in the polymer matrix), and thus the polymer dispersed liquid crystal material is transparent to the light incident therein (i.e., light transmission state). After the electric field is removed, the liquid crystal droplets return to the original state of scattering the light incident into the polymer dispersed liquid crystal material in all directions (in this case, the polymer dispersed liquid crystal material returns to the light scattering state). The above-mentioned characteristics of the polymer dispersed liquid crystal material can be used to control the intensity of light passing through the PDLC film layer by changing the voltage thereon.

[0062] Figure 7 A plan view of the transparent display panel 100 observed from the first display surface 11 is schematically shown. A plurality of pixel units 50 are shown in the figure. As mentioned above, by applying different voltages to each part corresponding to the liquid crystal layer 30 and each pixel unit 50, the liquid crystal layer 30 and each pixel unit 50 can be in different scattering or transmission states, thereby realizing image display. As an example, each pixel unit 50 can be separated by a black matrix 60. The black matrix 60 can be arranged on the side of the first substrate 10 facing the liquid crystal layer 30 to improve the contrast of the displayed image. However, the embodiments of the present disclosure are not limited thereto, and the transparent display panel 100 may not be provided with a black matrix 60.

[0063] It should be noted that, in the transparent display panel, the lengths of the first substrate 10 and the second substrate 20 may be different. Figure 2 In the example shown, the second substrate 20 is parallel to the first display surface 11 and perpendicular to the light source assembly (for example, in Figure 2 The length in the y direction of the transparent display panel 100 is greater than the length of the first substrate 10 in this direction. Specifically, the second substrate 20 has an edge extension portion 22, and the edge extension portion 22 extends beyond the first light incident surface 13 in a direction away from the display area AA of the transparent display panel 100. Figure 2 As shown, the edge extension 22 of the second substrate 20 and the first light incident surface 13 of the first substrate 10 are located on the same side of the transparent display panel 100, and the orthographic projection of the first substrate 10 on the surface 29 of the second substrate 20 facing the first substrate 10 does not overlap with the edge extension 22. The first light source assembly 41 may be located on the side of the first substrate 10 where the first light incident surface 13 is provided. In this case, if the first light source assembly 41 is directly placed below the first substrate 10 and the second substrate 20, a considerable portion of the light emitted from the first light source assembly 41 will not be able to enter the first substrate 10 and the second substrate 20, and the light energy utilization rate will be very low.

[0064] In order to solve this problem, in the embodiment of the present disclosure, a first light guide bar 61 is further provided in the transparent display panel 100. The first light guide bar 61 is located between the first light source assembly 41 and the first light incident surface 13. The first light guide bar 61 has a first light guide bar surface 611 facing the first light incident surface 13, a second light guide bar surface 612 facing away from the first light incident surface 13, and a first light guide bar slope surface 613 located between the first light guide bar surface 611 and the second light guide bar surface 612. Figure 2As shown, the inner angle θ formed between the first light guide strip slope 613 and the second light guide strip surface 612 is less than or equal to 90 degrees. That is, the cross section of the first light guide strip 41 is a trapezoid. The bottom side of the trapezoid faces the first light source assembly 41, which is used to receive the light emitted from the first light source assembly 41, and the top side of the trapezoid faces the first light incident surface 13 of the first substrate 10, which is used to guide the light into the first substrate 10. It should be noted that the first light guide strip surface 611 and the second light guide strip surface 612 do not need to be absolutely parallel, and can be set according to the shape of the first light incident surface 13 and the first light source assembly 41.

[0065] The first light guide bar 61 of the shape described above can obtain good light coupling efficiency. At least a portion of the light entering the first light guide bar 41 from the first light guide bar surface 611 can be reflected by the first light guide bar slope 613 toward the first substrate 10 or the second substrate 20. In some embodiments, the inner angle θ formed between the first light guide bar slope 613 and the second light guide bar surface 612 is greater than 70 degrees. Table 1 lists exemplary values ​​of the center brightness and overall brightness uniformity of the display panel when the inner angle θ formed between the first light guide bar slope 613 and the second light guide bar surface 612 of the first light guide bar 61 is different angles, and also lists exemplary values ​​of the center brightness and overall brightness uniformity of the display panel without setting the light guide bar for comparison. The center brightness listed in Table 1 is a normalized value, and the larger the value, the higher the center brightness of the display panel. Similarly, the values ​​of brightness uniformity listed in Table 1 are also normalized values, and the larger the value, the better the overall brightness uniformity of the display panel. It can be seen from Table 1 that when the first light guide bar 61 is not provided between the first light source assembly 41 and the first substrate 10, due to the difference in length between the first substrate 10 and the second substrate 20 in the y direction, a considerable proportion of the light emitted from the first light source assembly 41 will not be coupled into the first substrate 10, resulting in low optical efficiency. Accordingly, the center brightness and brightness uniformity of the display panel are relatively poor. After the first light guide bar 61 is provided, the first light guide bar 61 can increase the coupling amount of the light emitted by the first light source assembly 41 into the first substrate 10 and the second substrate 20, thereby improving the optical coupling efficiency. Thus, the center brightness and overall brightness uniformity of the display panel can be increased.

[0066] Table 1

[0067]

[0068] In addition, it can be seen from Table 1 that when the inner angle θ formed between the first light guide strip slope 613 and the second light guide strip surface 612 gradually increases from 70 degrees, the optical coupling efficiency also increases accordingly. In particular, when θ reaches 84.5 degrees, the center brightness of the display panel increases by about 3.5 times compared with the case without the light guide strip, and the brightness uniformity of the display panel is also greatly increased compared with the case without the light guide strip. In some embodiments, the inner angle θ formed between the first light guide strip slope 613 and the second light guide strip surface 612 is greater than 84.5 degrees. The increase in angle θ is conducive to increasing the probability of total reflection of the light emitted from the first light source assembly 41 at the first light guide strip slope 613, so that more light can be totally reflected toward the first substrate 10 and the second substrate 20 to improve the optical coupling efficiency.

[0069] In some embodiments, the area of ​​the second light guide bar surface 612 is greater than the area of ​​the first light guide bar surface 611. That is, the area of ​​the light receiving surface of the first light guide bar 61 facing the first light source assembly 41 is greater than the area of ​​the light output surface of the first light guide bar 61 facing the first substrate 10. This aspect can make the design of the first light guide bar 61 match the direction of the first light source assembly 41 perpendicular to the first display surface 11 of the first substrate 10 (such as Figure 2 The width in the x direction (shown in FIG. 1 ) is greater than the thickness of the first substrate 10. As an example, the first light source assembly 41 (eg, a light bar) is Figure 2 The width in the x direction shown in FIG is between 1.0 mm and 3.0 mm, and the thickness of the first substrate 10 is, for example, between 0.3 mm and 0.7 mm, such as about 0.5 mm. On the other hand, the area of ​​the second light guide strip surface 612 is larger than the area of ​​the first light guide strip surface 611, which helps to improve the optical coupling efficiency, so that the first light guide strip 61 can guide more light into the first substrate 10 and the second substrate 20.

[0070] In some embodiments, the first light guide bar 61 may also have a third light guide bar surface 614 facing the second substrate 20. The second substrate 20 may have a second light incident surface 23 facing the third light guide bar surface 614. The second light incident surface 23 is used to receive the light emitted from the third light guide bar surface 614. The first light guide bar 61 is respectively provided with a first light guide bar surface 611 facing the first light incident surface 13 of the first substrate 10 and a third light guide bar surface 614 facing the second light incident surface 23 of the second substrate 20, so that the first light guide bar 61 can efficiently couple the light from the first light source assembly 41 to the first substrate 10 and the second substrate 20. In some embodiments, the first light guide bar surface 611 of the first light guide bar 61 can contact the first light incident surface 13 of the first substrate 10, and the third light guide bar surface 614 of the first light guide bar 61 can contact the second light incident surface 23 of the second substrate 20. This can further promote the light coupling from the first light guide bar 61 to the first substrate 10 and the second substrate 20. However, the embodiments of the present disclosure are not limited thereto. Fig. 9 As shown, a first adhesive layer 14 may be provided between the first light guide strip surface 611 and the first light incident surface 13 of the first substrate 10, and a second adhesive layer 24 may be provided between the third light guide strip surface 614 and the second light incident surface 23 of the second substrate 20. That is, the first light guide strip surface 611 of the first light guide strip 61 and the first light incident surface 13 of the first substrate 10 are bonded together by the first adhesive layer 14, and the third light guide strip surface 614 of the first light guide strip 61 and the second light incident surface 23 of the second substrate 20 are bonded together by the second adhesive layer 24. As an example, the first adhesive layer 14 and the second adhesive layer 24 may be made of at least partially transparent optical adhesive.

[0071] In some embodiments, when the second substrate 20 is an array substrate and the first substrate 10 is a cover substrate, the second light incident surface 23 is the surface of the edge extension 22 of the second substrate 20 close to the first substrate 10. The edge extension 22 is a non-display area, and some circuit devices such as driving circuits, leads, etc. can be arranged on the second light incident surface 23. These circuit devices can be arranged in, for example, a chip on glass (COG) package or a chip on film (COF) package. A plurality of COG packages and COF packages (such as two COG packages and two COF packages) can be arranged on the second light incident surface 23 as needed. For example, the COG package can be used to set a driving circuit device, and the COF package can be used to set a wiring, etc.

[0072] As an example, Fig.11As shown, a COG package 231 and a COF package 232 are provided on the second light incident surface 23. The COF package 232 can be used to connect an external printed circuit board (PCB) 233, for example. The COG package 231 is directly attached to the second light incident surface 23. One end of the COF package 232 is attached to the edge of the second light incident surface 23, and the other end is bound to the printed circuit board 233. Fig.11 It can be seen from the figure that the thickness of the COG package 231 is greater than the thickness of the COF package 232. The third light guide bar surface 614 of the first light guide bar 61 contacts the side of the COG package 231 away from the second light incident surface 23, and a gap is left between the third light guide bar surface 614 of the first light guide bar 61 and the second light incident surface 23 and the COF package 232. For example, the thickness of the COG package 231 is about 100 microns, and the thickness of the COF package 232 is about 50 microns.

[0073] In some embodiments, Figure 3 As shown, a sealant 90 may also be provided in the transparent display panel, and the sealant 90 is located between the first substrate 10 and the second substrate 20 and at the periphery of the liquid crystal layer 30, and is used to seal the liquid crystal layer 30. In practice, a gap may be provided between the surface 611 of the first light guide strip and the sealant 90, so as to facilitate the assembly of the first light guide strip 61 with the first substrate 10 and the second substrate 20.

[0074] In some embodiments, the distance between the first light guide bar surface 611 and the second light guide bar surface 612 is less than or equal to the distance between the second substrate 20 and the first substrate 10 in a direction perpendicular to the first light incident surface 13 (eg Figure 2 and Figure 3 In other words, the second light guide strip surface 612 may be substantially flush with the edge of the second substrate 20 close to the first light source assembly 41 or may be closer to the first light incident surface 13 than the edge of the second substrate 20 close to the first light source assembly 41. Fig.10 The case where the distance between the first light guide bar surface 611 and the second light guide bar surface 612 is less than the length difference between the second substrate 20 and the first substrate 10 in the direction perpendicular to the first light incident surface 13 is shown. In this case, the second light guide bar surface 612 is retracted toward the first substrate 10 relative to the edge 25 of the second substrate 20. Accordingly, if the second light guide bar surface 612 is closer to the first light incident surface 13 than the edge 25 of the second substrate 20 close to the first light source assembly 41, the first light source assembly 41 can also be arranged to be closer to the first light incident surface 13 than the edge 25 of the second substrate 20. This is conducive to reducing the space occupied by the first light guide bar 61 and the first light source assembly 41. As an example, the length difference between the first substrate 10 and the second substrate 20 can be 5mm to 15mm, for example, 10mm.

[0075] In some embodiments, the width of the first light guide strip surface 611 in a direction perpendicular to the first display surface 11 of the first substrate 10 may be less than or equal to the width of the first substrate 10 and the liquid crystal layer 30 in a direction perpendicular to the first display surface 11 of the first substrate 10 (eg, Figure 2 and Figure 3 This can prevent the first light guide strip surface 611 from being perpendicular to the first display surface 11 of the first substrate 10 (eg, Figure 2 and Figure 3 The first light guide strip surface 611 extends beyond the first display surface 11 of the first substrate 10 in the x direction (in the x direction), thereby preventing light leakage caused by the first light guide strip surface 611 extending beyond the first display surface 11 of the first substrate 10. As an example, the edge of the first light guide strip surface 611 close to the first light guide strip slope surface 613 may be flush with the first display surface 11 of the first substrate 10 (see Figure 2 ) or the edge of the first light guide strip surface 611 close to the first light guide strip slope 613 may be retracted relative to the first display surface 11 of the first substrate 10 toward the liquid crystal layer 30 (see Fig. 9 This can enable the light emitted from the first light guide bar surface 611 of the first light guide bar 61 to substantially and completely enter the first substrate 10 .

[0076] In some embodiments, the first light source assembly 41 is perpendicular to the first display surface 11 of the first substrate 10 (eg Figure 2 The width of the second light guide bar surface 612 in the direction perpendicular to the first display surface 11 of the first substrate 10 is less than or equal to the width of the second light guide bar surface 612 in the direction perpendicular to the first display surface 11 of the first substrate 10. This facilitates the second light guide bar surface 612 to be arranged to completely cover the first light source assembly 41, so that most of the light emitted from the first light source assembly 41 can be received by the second light guide bar surface 612, thereby improving optical efficiency.

[0077] In some embodiments, Figure 3 As shown, the transparent display panel 100 may further include a fixing frame 70, the fixing frame 70 including a positioning surface 71 matched with the first light guide bar slope surface 613 of the first light guide bar 61 and a light source fixing portion 72 for fixing the first light source assembly 41. Figure 3In the illustrated embodiment, the positioning surface 71 is a slope surface whose slope matches the slope of the first light guide strip slope surface 613 (for example, the slope of the positioning surface 71 is the same as the slope of the first light guide strip slope surface 613), and the fixing frame 70 maintains the first light guide strip surface 611 of the first light guide strip 61 in contact with the first light incident surface 13 of the first substrate 10 and maintains the third light guide strip surface 614 of the first light guide strip 61 in contact with the structure (for example, COG package 231) on the second light incident surface 23 of the second substrate 20 through the cooperation between the positioning surface 71 and the first light guide strip slope surface 613. The light source fixing portion 72 may be provided with a groove for accommodating the first light source assembly 41, which may be used to maintain the correct position of the first light source assembly 41 relative to the first light guide strip 61. The groove is arranged toward the second light guide strip surface 612 of the first light guide strip 61. The fixing frame 70 can hold the first light guide bar 61 together with the first substrate 10 and the second substrate 20 from the side of the second substrate 20 away from the first light guide bar 61 and the side of the first substrate 10 away from the second substrate 20. This solution can avoid the use of adhesive to bond the first light guide bar 61 and the first light guide bar 61 and the second substrate 20 together, simplifying the manufacturing process. In addition, since no adhesive is required between the third light guide bar surface 614 of the first light guide bar 61 and the second substrate 10 and between the first light guide bar surface 611 and the first substrate 10, the optical coupling efficiency of light from the first light guide bar 61 to the first substrate 10 and the second substrate 20 can be improved. As an example, there can be a certain gap between the surface of the first light source assembly 41 facing the first light guide bar 61 and the second light guide bar surface 612 of the first light guide bar 61, and the gap can be, for example, between 0.5 mm and 2 mm. In some embodiments, the fixing frame 70 can use the above-mentioned mechanical cooperation to maintain the relative position relationship between the first light guide bar 61 and the first substrate 10 and the second substrate 20. However, the embodiments of the present disclosure are not limited thereto. For example, the positioning surface 71 of the fixing frame 70 may also be bonded to the first light guide strip slope surface 613 of the first light guide strip 61 by an adhesive.

[0078] In the above-mentioned embodiment, the transparent display panel 100 is shown as having a light guide bar (i.e., the first light guide bar 61) disposed on only one side. However, in other embodiments, in addition to the first light guide bar 61, a second light source assembly 42 (i.e., the first light guide bar 61) may be disposed on the other side of the transparent display panel 100. Figure 4 and Figure 5A second light guide bar 62 is disposed between the first substrate 10 and the second substrate 20 and the first substrate 10 and the second substrate 20. The first substrate 10 may further include a third light incident surface 15, the third light incident surface 15 being disposed on the side of the first substrate 10 opposite to the first light incident surface 13, and the second substrate 20 further includes a fourth light incident surface 26, the fourth light incident surface 26 and the third light incident surface 15 being disposed on the same side of the transparent display panel 100', that is, the side where the second light source assembly 42 of the transparent display panel is located. As an example, the second light guide bar 62 is disposed on the side of the second light source assembly 42 facing the third light incident surface 15 and the fourth light incident surface 26 and on the side of the third light incident surface 15 and the fourth light incident surface 26 facing the second light source assembly 42. The second light guide strip 62 has a fourth light guide strip surface 621 facing the third light incident surface 15 and the fourth light incident surface 26, a fifth light guide strip surface 622 away from the third light incident surface 15 and the fourth light incident surface 26, and a second light guide strip slope surface 623 located between the fourth light guide strip surface 621 and the fifth light guide strip surface 622, and the internal angle formed between the second light guide strip slope surface 623 and the fifth light guide strip surface 622 is less than or equal to 90 degrees.

[0079] The above-mentioned solution of providing the second light guide strip 62 can be used, for example, for the second light source assembly 42 in a direction perpendicular to the first display surface 11 of the first substrate 10 (for example Figure 5 The case where the width of the second light source assembly 42 in the x direction (in the x direction) is relatively large (exceeding the sum of the thicknesses of the first substrate 10, the second substrate 20 and the liquid crystal layer 30). It can be understood that when the width of the second light source assembly 42 is large, more light-emitting elements (such as LED chips) can be arranged on the second light source assembly 42 to have a higher light intensity. The second light guide bar 62 can also guide the light emitted by the light-emitting elements on the part of the second light source assembly 42 extending beyond the first substrate 10 or the second substrate 20 in the direction perpendicular to the first display surface 11 of the first substrate 10 into the first substrate 10 or the second substrate 20, thereby enhancing the brightness of the transparent display panel and improving the display effect. The light from the second light source assembly 42 and guided into the first substrate 10 and the second substrate 20 through the second light guide bar 62 can also be reflected back and forth between the first display surface 11 of the first substrate 10 and the second surface 21 of the second substrate 20 facing away from the first substrate 10 (expected to be total reflection).

[0080] In some embodiments, the surface of the fourth light guide strip 621 is perpendicular to the first display surface 11 (eg Figure 5 The width in the x direction (in the x direction) is less than or equal to the width of the first substrate 10, the second substrate 20 and the liquid crystal layer 30 in the direction perpendicular to the first display surface 11 (for example Figure 5The thickness of the fourth light guide strip 621 in the x direction (in the x direction) is 0.0447mm / s and 0.033mm / s. This can facilitate the fourth light guide strip surface 621 to be arranged in a direction perpendicular to the first display surface 11 so as not to exceed the first display surface 11 of the first substrate 10 and the second surface 21 of the second substrate 20 away from the first substrate 10. As an example, similarly, the fourth light guide strip surface 621 can also be arranged in a length direction of the second light guide strip 62 so as not to exceed the boundary of the first substrate 10 and the boundary of the second substrate 20. In this way, it is easy to guide as much light emitted from the second light guide strip 62 as possible into the first substrate 10 and the second substrate 20, thereby improving the optical efficiency.

[0081] In some embodiments, the fourth light guide bar surface 621 may be in contact with the third light incident surface 15 and the fourth light incident surface 26. This is conducive to maintaining a stable relative relationship between the fourth light guide bar surface 621 and the third light incident surface 15 and the fourth light incident surface 26 and improving the light coupling efficiency of light entering the first substrate 10 and the second substrate 20 from the second light guide bar 62. However, the embodiments of the present disclosure are not limited thereto, for example, the fourth light guide bar surface 621 may also be bonded to the third light incident surface 15 and the fourth light incident surface 26 through an at least partially transparent adhesive layer.

[0082] In some embodiments, the second light source assembly 42 is perpendicular to the first display surface 11 (eg Figure 4 and Figure 5 The width of the second light source assembly 42 in the direction perpendicular to the first display surface 11 (in the x direction) is greater than the sum of the thicknesses of the first substrate 10, the second substrate 20 and the liquid crystal layer 30 in the direction perpendicular to the first display surface 11. This means that after the second light guide bar 62 is adopted, a second light source assembly 42 with a larger size can be adopted. In addition, the width of the second light source assembly 42 in the direction perpendicular to the first display surface 11 can also be less than or equal to the width of the fifth light guide bar surface 622 in the direction perpendicular to the first display surface 11. This can enable the surface of the second light source assembly 42 facing the second light guide bar 62 to be completely covered by the fifth light guide bar surface 622, thereby more effectively utilizing the energy of the light emitted by the second light source assembly 42.

[0083] In some embodiments, there may be a gap of 0.5 to 2 mm between the first light source assembly 41 and the second light guide bar surface 612 of the first light guide bar 61. In some embodiments, there may be a gap of 0.5 to 2 mm between the second light source assembly 42 and the fifth light guide bar surface 622 of the second light guide bar 62. This can prevent the first light guide bar 61 from squeezing the first light source assembly 41 and the second light guide bar 62 from squeezing the second light source assembly 42.

[0084] In some embodiments, the first light guide bar 61, the second light guide bar 62, the first substrate 10 and the second substrate 20 have the same refractive index, for example, they are all made of transparent materials such as glass or resin. This helps to avoid undesired refraction when light enters the first substrate 10 or the second substrate 20 from the first light guide bar 61 or the second light guide bar 62. However, the embodiments of the present disclosure are not limited thereto, and any two of the first light guide bar 61, the second light guide bar 62, the first substrate 10 and the second substrate 20 may also have different refractive indices.

[0085] Figure 8 , an exemplary structure of the first light source assembly 41 is shown. The first light source assembly 41 may include a carrier plate 411 and a plurality of light-emitting elements 412 disposed on the carrier plate 411. The light-emitting element 412 may be disposed on a side of the carrier plate 411 facing the first substrate 10 to face the second light guide bar surface 612 of the first light guide bar 61. The plurality of light-emitting elements 412 may be arranged on the carrier plate 411 in an array. As an example, the orthographic projection of the first light guide bar 61 on the first light source assembly 41 may cover the plurality of light-emitting elements 412, so that the light emitted by these light-emitting elements 412 can be better received by the first light guide bar 61, thereby improving the optical coupling efficiency. In some embodiments, the plurality of light-emitting elements may include a plurality of light-emitting diode chips. As an example, the plurality of light-emitting diode chips may have the same color or may have multiple colors. For example, the first light source assembly 41 may include a plurality of groups of light-emitting elements, each group of light-emitting elements may include a red light-emitting diode chip 421, a green light-emitting diode chip 422, and a blue light-emitting diode chip 423. The plurality of groups of light-emitting elements may correspond to respective pixel units 50 on the display panel. This can be used to achieve color display. As for the structure of the second light source assembly 42, it can be similar to the first light source assembly 41, and only the size can be different. Therefore, the specific structural example of the second light source assembly 42 is not repeated.

[0086] like Figure 6As shown, the transparent display panel 100 may further include: a first electrode layer 81 and a second electrode layer 82. The first electrode layer 81 is located between the liquid crystal layer 30 and the first substrate 10 in a direction perpendicular to the first display surface 11. The second electrode layer 82 may be located between the liquid crystal layer 30 and the second substrate 20 in a direction perpendicular to the first display surface 11. As mentioned above, the liquid crystal layer 30 may have a light transmission state and at least one light scattering state. The first electrode layer 81 and the second electrode layer 82 may be configured to control the liquid crystal layer 30 to switch between the light transmission state and the at least one light scattering state. A plurality of pixel units 50 may be arranged on the transparent display panel 100, and the first electrode layer 81 and the second electrode layer 82 may respectively perform voltage control on the portions corresponding to the respective pixel units 50 in the liquid crystal layer 30 to realize transparent image display. As an example, the transparent display panel 100 may further include a first alignment layer 83 and a second alignment layer 84. The first orientation layer 83 is located on the side of the liquid crystal layer 30 facing the first electrode layer 81, and the second orientation layer 84 is located on the side of the liquid crystal layer 30 facing the second electrode layer 82. In some embodiments, the first electrode layer 81 and the second electrode layer 82 may be transparent electrode layers. Some transparent film structures may also be disposed on the first substrate 10 and the second substrate 20. For example, Figure 6 As shown, the first insulating layer (e.g., planarization layer) 85, the second insulating layer (e.g., etching stop layer) 86, and the third insulating layer (gate insulating layer) 87 may be sequentially disposed on the side of the second substrate 20 facing the liquid crystal layer 30, and the fourth insulating layer (e.g., protective layer) 88 may also be disposed on the side of the first substrate 10 facing the liquid crystal layer 30. These film layers all allow light to pass through, so when the light entering the first substrate 10 and the second substrate 20 is reflected back and forth between the first display surface 11 of the first substrate 10 and the second surface 21 of the second substrate 20, it can easily pass through these transparent film layers. Figure 6 , an exemplary pixel unit 50 is also shown, and adjacent pixel units 50 may be separated by a black matrix 60. The black matrix 60 may be used to increase the contrast of the displayed image for some non-light-transmitting structures (such as metal lines 89, etc.) on the second substrate 20. However, it should be noted that in the embodiments according to the present disclosure, the black matrix 60 is not a necessary structure.

[0087] Similar to the first light guide strip 61, in some embodiments, the inner angle θ' formed between the second light guide strip slope 623 and the fifth light guide strip surface 622 of the second light guide strip 62 may be greater than 70 degrees, for example, greater than 84.5 degrees. For the analysis of the inner angle θ' formed between the second light guide strip slope 623 and the fifth light guide strip surface 622 of the second light guide strip 62, reference may be made to the aforementioned description of the inner angle θ formed between the first light guide strip slope 613 and the second light guide strip surface 612 of the first light guide strip 61.

[0088] Fig.12 A transparent display panel 100" according to some other embodiments of the present disclosure is shown. The transparent display panel 100" also includes: a first substrate 10 and a second substrate 20 and a liquid crystal layer 30 located between the first substrate 10 and the second substrate 20. Different from the aforementioned embodiments, the transparent display panel 100" also includes a light guide plate 900. The light guide plate 900 is located on the side of the first substrate 10 away from the liquid crystal layer 30. The light guide plate 900 can be used to improve the uniformity of light intensity. Specifically, the light input from the light guide plate 900 can have better uniformity through reflection in the light guide plate 900. Due to the design requirements of the light guide plate 900 and the weight and thickness of the entire panel, the thickness of the light guide plate 900 is generally thin, such as less than 1 mm, such as about 0.5 mm. The light source assembly (for example, the first light source The width of the light guide plate 900 may exceed the thickness of the light guide plate 900, for example, be equal to or greater than 1 mm. Moreover, if the brightness of the light source is to be increased, the number of light-emitting elements (such as light-emitting diode chips) needs to be increased, so that the light source assembly will be wider. Therefore, in order to achieve light coupling between the light source assembly and the light guide plate and improve the light extraction efficiency, the structure of the first light guide strip 61 mentioned above may also be used as a coupling component between the light source assembly and the light guide plate 900. The above-mentioned light guide plate 900 includes but is not limited to ordinary light guide plates, front-type light guide plates and other light guide structures that can achieve light conduction and light extraction.

[0089] In some embodiments, the light guide plate 900 has a first light guide plate surface 91 facing away from the liquid crystal layer 30, a second light guide plate surface 92 facing the liquid crystal layer 30, and a fifth light incident surface 93 located between the first light guide plate surface 91 and the second light guide plate surface 92. Fig.12As shown, the first light source assembly 41 may be located on the side of the light guide plate 900 where the fifth light incident surface 93 is provided. A first light guide bar 61 is provided in the transparent display panel 100", and the first light guide bar 61 is located between the first light source assembly 41 and the fifth light incident surface 93. The first light guide bar 61 has a first light guide bar surface 611 facing the fifth light incident surface 93, a second light guide bar surface 612 away from the fifth light incident surface 93, and a first light guide bar slope surface 613 located between the first light guide bar surface 611 and the second light guide bar surface 612. Similar to the aforementioned embodiment, the internal angle θ" formed between the first light guide bar slope surface 613 and the second light guide bar surface 612 is less than or equal to 90 degrees. Desirably, the internal angle is greater than 70 degrees, for example, greater than 84.5 degrees.

[0090] With the aid of the first light guide bar 61, the light emitted by the first light source assembly 41 of larger size can be efficiently coupled into the light guide plate 900, which allows more light emitting elements to be arranged on the first light source assembly 41. This can improve the amplitude and uniformity of the brightness of the display panel.

[0091] In some embodiments, the transparent display panel 100" further includes a refractive index matching layer 94, which is arranged on the surface of the light guide plate 900 facing the liquid crystal layer 30. For example, when the light guide plate 900 is located on the side of the first substrate 10 away from the liquid crystal layer 30, the refractive index matching layer 94 is located between the light guide plate 900 and the first substrate 10; and when the light guide plate 900 is located on the side of the second substrate 20 away from the liquid crystal layer 30, the refractive index matching layer 94 is located between the light guide plate 900 and the second substrate 20. The refractive index of the refractive index matching layer 94 is lower than that of the light guide plate 90. 0 and the refractive index of the first substrate 10 and the refractive index of the second substrate 20. This is to ensure that when light is emitted from the light guide plate 900 to the refractive index matching layer 94, the total reflection condition can be met at the interface between the light guide plate 900 and the refractive index matching layer 94. Similarly, when light is emitted from the first substrate 10 or the second substrate 20 to the refractive index matching layer 94, the total reflection condition can be met at the interface between the first substrate 10 and the refractive index matching layer 94 or at the interface between the second substrate 20 and the refractive index matching layer 94. As an example, the first substrate 10, the second substrate 20 and the light guide plate 900 can be made of the same material (such as glass, etc.).

[0092] Similar to the previous embodiment, the second substrate 20 may have an edge extension portion 22, and the edge extension portion 22 of the second substrate 20 and the first light source assembly 41 are located on the same side of the transparent display panel, and the orthographic projection of the first substrate 10 on the surface of the second substrate 20 facing the first substrate 10 does not overlap with the edge extension portion 22.

[0093] In some embodiments, Fig.14 As shown, the transparent display panel 100" may further include: a fixing frame 70' for fixing the first light guide strip 61, the fixing frame 70' including a positioning surface 71' matched with the first light guide strip slope surface 613 of the first light guide strip 61, the positioning surface 71' and the first light guide strip slope surface 613 are inclined surfaces with the same inclination angle. The fixing frame 70' maintains the contact between the first light guide strip surface 611 of the first light guide strip 61 and the fifth light incident surface 93 of the light guide plate 900 through the matching of the positioning surface 71' and the first light guide strip slope surface 613. In the example Fig.14 In the example shown, since there is an obvious gap between the first light guide bar 61 and the edge extension 22 of the second substrate 20, the fixing frame 70' may further include an extension 73' extending between the edge extension 22 of the first light guide bar 61 and the second substrate 20, so as to improve the stability of the first light guide bar 61. The fixing frame 70' may further include a light source fixing portion 72' for fixing the first light source assembly 41. The light source fixing portion 72' may be provided with a groove for accommodating the first light source assembly 41, and may be used to maintain the correct position of the first light source assembly 41 relative to the first light guide bar 61. The groove is arranged toward the second light guide bar surface 612 of the first light guide bar 61. The fixing frame 70' may hold the first light guide bar 61 together with the light guide bar 90, the first substrate 10 and the second substrate 20 from the side of the second substrate 20 away from the first light guide bar 61 and the side of the light guide bar 90 away from the second substrate 20. This solution may avoid using an adhesive to bond the first light guide bar 61 and the first substrate 10 and the first light guide bar 61 and the second substrate 20 together, thereby simplifying the manufacturing process. In such Fig.14 In the example shown, the fixing frame 70' is assembled from two parts, the part on the left side of the third light guide strip surface 614 in the figure is the first part, and the part on the right side of the third light guide strip surface 614 in the figure is the second part. This is to facilitate the installation of the fixing frame 70'. However, the embodiments of the present disclosure are not limited thereto, for example, the fixing frame 70' may also be an integrated structure.

[0094] In some embodiments, Fig.12 As shown, the light guide plate 900 is located on the side of the first substrate 10 away from the liquid crystal layer 30, and the width of the first light guide strip surface 611 in the direction perpendicular to the first light guide plate surface 91 is equal to or greater than the thickness of the light guide plate 900. For example, the thickness of the first light guide strip surface 611 in the direction perpendicular to the first light guide plate surface 91 is equal to the sum of the thicknesses of the light guide plate 900, the refractive index matching layer 94, the first substrate 10 and the liquid crystal layer 30 (as shown in FIG. Fig.16When the width of the first light guide strip surface 611 in a direction perpendicular to the first light guide plate surface 91 is equal to or greater than the thickness of the light guide plate 900, a portion of the light emitted from the first light guide strip surface 611 can enter the light guide plate 900 and then reflect back and forth between the first light guide plate surface 91 and the second light guide plate surface 92 of the light guide plate 900, and another portion of the light emitted from the first light guide strip surface 611 can enter the first substrate 10, thereby reflecting back and forth between the first substrate 10 and the second substrate 20. Both portions of light can be used to realize image display of the panel.

[0095] In another embodiment, if Fig.13 As shown, the light guide plate 900 is located on the side of the second substrate 20 away from the liquid crystal layer 30, and the thickness of the first light guide strip surface 611 in a direction perpendicular to the first light guide plate surface 91 is equal to or greater than the thickness of the light guide plate 900. For example, the thickness of the first light guide strip surface 611 in a direction perpendicular to the first light guide plate surface 91 is equal to the sum of the thicknesses of the light guide plate 900, the refractive index matching layer 94, and the second substrate 20 (as shown in FIG. Fig.17 When the width of the first light guide strip surface 611 in a direction perpendicular to the first light guide plate surface 91 is equal to or greater than the thickness of the light guide plate 900, a portion of the light emitted from the first light guide strip surface 611 can enter the light guide plate 900 and then reflect back and forth between the first light guide plate surface 91 and the second light guide plate surface 92 of the light guide plate 900, and another portion of the light emitted from the first light guide strip surface 611 can enter the second substrate 20, thereby reflecting back and forth between the first substrate 10 and the second substrate 20. Both portions of light can be used to realize image display of the panel.

[0096] The wider the width of the first light guide bar surface 611 is, the larger the coupling area between the first light guide bar 61 and the light guide plate 900 (or the combination of the light guide plate 900 and the first substrate 10 or the combination of the light guide plate 900 and the second substrate 20 ) is.

[0097] In some embodiments, an area of ​​the second light guide bar surface 612 is greater than an area of ​​the first light guide bar surface 611 .

[0098] In some embodiments, the first light guide bar 61 may further include a third light guide bar surface 614 located on the opposite side of the first light guide bar slope surface 613, and the inner angle β formed between the third light guide bar surface 614 and the second light guide bar surface 612 is less than or equal to 90 degrees. Figure 12 to Figure 14 In the embodiment shown, the inner angle β formed between the third light guide strip surface 614 and the second light guide strip surface 612 is equal to 90 degrees. Fig.15In the example shown, the inner angle β formed between the third light guide strip surface 614 and the second light guide strip surface 612 is less than 90 degrees. The inner angle β can also be set to be greater than 70 degrees, for example, greater than 84.5 degrees. The value and optimization of the inner angle β are similar to those of the inner angle θ" mentioned above, and can be referred to the above analysis, which will not be repeated here.

[0099] In some embodiments of the present disclosure, some scattering point structures (for example, having a prism or semicircular shape) may also be set on the first light guide plate surface 91 or the second light guide plate surface 92 of the light guide plate 900. These scattering point structures can guide the light reciprocatingly reflected in the light guide plate 900 to the first substrate 10 or the second substrate 20.

[0100] Although Figures 12 to 15 The embodiment only shows an example in which one light guide strip is provided, but it should be understood that when light source assemblies are provided on opposite sides of the light guide plate 900, such a light guide strip may also be provided between each light source assembly and the light guide plate 900.

[0101] exist Figures 12 to 17 The first light source assembly 41 in the illustrated embodiment may have substantially the same or similar structure as the first light source assembly 41 in the aforementioned embodiment, and the specific details are not repeated here.

[0102] An embodiment of the present disclosure further provides an electronic device, including the transparent display panel 100, 100', 100" described in any of the above embodiments. The electronic device may be any device with a transparent display function, such as a billboard, a window, a digital photo frame, etc.

[0103] Although the present disclosure is described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify the embodiments of the present disclosure and should not be construed as limiting the present disclosure. The dimensional ratios in the drawings are merely illustrative and should not be construed as limiting the present disclosure.

[0104] The above embodiments are merely illustrative of the principles and structures of the present disclosure, and are not intended to limit the present disclosure. It should be understood by those skilled in the art that any changes and improvements made to the present disclosure without departing from the overall concept of the present disclosure are within the scope of the present disclosure. The scope of protection of the present disclosure shall be subject to the scope defined by the claims of this application.

Claims

1. A transparent display panel, comprising: a first substrate, a second substrate, and a liquid crystal layer located between the first substrate and the second substrate, the first substrate having a first display surface facing away from the second substrate, a first surface facing the second substrate, and a first light incident surface located between the first display surface and the first surface, the second substrate having an edge extension, the edge extension of the second substrate and the first light incident surface of the first substrate being located on the same side of the transparent display panel, and an orthographic projection of the first substrate on the surface of the second substrate facing the first substrate does not overlap with the edge extension, Wherein, the transparent display panel further includes: A first light source assembly, the first light source assembly being located on a side of the first substrate where the first light incident surface is provided; a second light source assembly, the second light source assembly being located on another side of the first substrate opposite to the first light source assembly; and a first light guide bar, the first light guide bar being located between the first light source assembly and the first light incident surface, the first light guide bar having a first light guide bar surface facing the first light incident surface, a second light guide bar surface facing away from the first light incident surface, and a first light guide bar slope surface located between the first light guide bar surface and the second light guide bar surface, wherein an interior angle formed between the first light guide bar slope surface and the second light guide bar surface is less than or equal to 90 degrees; The transparent display panel further comprises: a fixing frame for fixing the first light guide strip to the first substrate and the second substrate, the fixing frame comprising a positioning surface matched with the first light guide strip slope surface of the first light guide strip, the positioning surface and the first light guide strip slope surface are inclined surfaces with the same inclination angle; The fixing frame further comprises a light source fixing portion for fixing the first light source assembly, the light source fixing portion is provided with a groove for accommodating the first light source assembly, and the groove is arranged toward the second light guide bar surface of the first light guide bar; The distance between the surface of the first light guide bar and the surface of the second light guide bar is equal to the length difference between the second substrate and the first substrate in a direction perpendicular to the first light incident surface; and The width of the surface of the first light guide strip in a direction perpendicular to the first display surface of the first substrate is less than or equal to the sum of the thicknesses of the first substrate and the liquid crystal layer in the direction perpendicular to the first display surface of the first substrate.

2. The transparent display panel according to claim 1, wherein: The surface area of ​​the second light guide strip is greater than the surface area of ​​the first light guide strip.

3. The transparent display panel according to claim 1, wherein: The first light guide bar has a third light guide bar surface facing the second substrate, the second substrate has a second light incident surface facing the third light guide bar surface, and the second light incident surface is used to receive the light emitted from the third light guide bar surface.

4. The transparent display panel according to claim 3, wherein: The surface of the first light guide strip contacts the first light incident surface of the first substrate, a glass chip-on-chip package and a film chip-on-chip package are arranged on the second light incident surface, and the surface of the third light guide strip contacts the glass chip-on-chip package on the second light incident surface of the second substrate.

5. The transparent display panel according to claim 4, further comprising a frame sealant, wherein the frame sealant is located between the first substrate and the second substrate and at the periphery of the liquid crystal layer, and is used to seal the liquid crystal layer, and a gap is provided between the surface of the first light guide strip and the frame sealant.

6. The transparent display panel according to claim 3, wherein: The first light source assembly is arranged to face the second light guide bar surface of the first light guide bar and the width of the first light source assembly in a direction perpendicular to the first display surface of the first substrate is less than or equal to the width of the second light guide bar surface in a direction perpendicular to the first display surface of the first substrate.

7. The transparent display panel according to any one of claims 1 to 6, wherein: The inner angle formed between the slope surface of the first light guide strip and the surface of the second light guide strip is greater than 84.5 degrees.

8. The transparent display panel according to any one of claims 1 to 6, wherein: The first substrate further includes a third light incident surface, which is disposed on a side of the first substrate opposite to the first light incident surface, and the second substrate further includes a fourth light incident surface, which is located on the same side of the transparent display panel as the third light incident surface; and The second light source assembly and the third light incident surface and the fourth light incident surface are arranged on the same side of the transparent display panel; Wherein, the transparent display panel further includes: A second light guide bar, the second light guide bar is located on a side of the second light source assembly facing the third light incident surface and the fourth light incident surface and on a side of the third light incident surface and the fourth light incident surface facing the second light source assembly, the second light guide bar has a fourth light guide bar surface facing the third light incident surface and the fourth light incident surface, a fifth light guide bar surface away from the third light incident surface and the fourth light incident surface, and a second light guide bar slope surface located between the fourth light guide bar surface and the fifth light guide bar surface, and an internal angle formed between the second light guide bar slope surface and the fifth light guide bar surface is less than or equal to 90 degrees.

9. The transparent display panel according to claim 8, wherein: The width of the surface of the fourth light guide strip in the direction perpendicular to the first display surface is less than or equal to the sum of the thicknesses of the first substrate, the second substrate and the liquid crystal layer in the direction perpendicular to the first display surface.

10. The transparent display panel according to claim 8, wherein: The surface of the fourth light guide strip is in contact with the third light incident surface and the fourth light incident surface.

11. The transparent display panel according to claim 8, wherein: The width of the second light source assembly in a direction perpendicular to the first display surface is greater than the sum of the thicknesses of the first substrate, the second substrate and the liquid crystal layer in the direction perpendicular to the first display surface and is less than or equal to the width of the surface of the fifth light guide strip in the direction perpendicular to the first display surface.

12. The transparent display panel according to claim 8, wherein: The first light guide bar, the second light guide bar, the first substrate and the second substrate have the same refractive index.

13. The transparent display panel according to claim 8, wherein: Each of the first light source assembly and the second light source assembly comprises: Loading plate; A plurality of light emitting diode chips, wherein the plurality of light emitting diode chips include light emitting diode chips of multiple colors arranged on a side of the carrier board facing the first substrate.

14. The transparent display panel according to claim 8, wherein: There is a gap of 0.5 to 2 mm between the first light source assembly and the second light guide bar surface of the first light guide bar, and there is a gap of 0.5 to 2 mm between the second light source assembly and the fifth light guide bar surface of the second light guide bar.

15. The transparent display panel according to any one of claims 1 to 5, further comprising: a first electrode layer, wherein the first electrode layer is located between the liquid crystal layer and the first substrate in a direction perpendicular to the first display surface; a second electrode layer, wherein the second electrode layer is located between the liquid crystal layer and the second substrate in a direction perpendicular to the first display surface; A first alignment layer, located on a side of the liquid crystal layer facing the first electrode layer; as well as A second alignment layer is located on a side of the liquid crystal layer facing the second electrode layer, The first electrode layer and the second electrode layer are configured to control the liquid crystal layer to switch between a light-transmitting state and at least one light-scattering state.

16. The transparent display panel according to claim 8, wherein: An internal angle formed between the slope surface of the second light guide strip and the surface of the fifth light guide strip is greater than 84.5 degrees.

17. An electronic device comprising the transparent display panel according to any one of claims 1 to 16.

Images