WO2020211541A1 - Transparent display panel, and method for manufacturing same - Google Patents

Abstract

A transparent display panel (100) and a method for manufacturing same. The transparent display panel (100) comprises: a first substrate (10) and a second substrate (20), wherein the first substrate (10) comprises a first surface (11) close to the second substrate (20), a second surface (12) away from the second substrate (20), and at least one light incident part (13) located on at least one side portion between the first surface (11) and the second surface (12) and configured to receive an incident beam (50); and a liquid crystal assembly (30) located between the first substrate (10) and the second substrate (20), wherein the liquid crystal assembly (30) has a plurality of pixel units (31) capable of switching between a light diffusion state and a light transmission state. The transparent display panel (100) further comprises a transparent holographic film (40) located on the first surface (11) of the first substrate (10), and the liquid crystal assembly (30) is located between the holographic film (40) and the second substrate (20), thereby effectively improving the uniformity of outgoing beams to implement transparent display.

Description

Transparent display panel and manufacturing method thereof

Cross references to related applications

The embodiments of the present disclosure require the rights and interests of a Chinese patent application with an application number of 201910307636.3 filed with the Chinese Patent Office on April 16, 2019, and the entire content of the application is incorporated herein by reference.

Technical field

The present disclosure relates to the field of display technology, and in particular, to a transparent display panel and a manufacturing method thereof.

Background technique

Transparent display is a display technology with broad application prospects. It can not only display images on the display screen, but also allow the user to see the scene behind the display screen through the display screen. For example, merchants often not only need to display some information on the glass window of the store, but also hope that people outside the glass window of the store can observe the goods displayed behind the window through the glass window of the store. In the related art, it is proposed to use a projector to project an image on a transparent rear projection screen inside the glass window to achieve a transparent display.

Summary of the invention

In order to solve at least one aspect of the above-mentioned problems and defects in the related art, the present invention provides a transparent display panel and a manufacturing method thereof.

In order to achieve the above objective, the technical solution is as follows:

An embodiment of the present disclosure provides a transparent display panel, including: a first substrate and a second substrate, the first substrate including a first surface close to the second substrate and a second surface away from the second substrate, and At least one light incident portion located between the first surface and the second surface at at least one side and configured to receive an incident light beam; and a liquid crystal assembly located between the first substrate and the second substrate, so The liquid crystal assembly has a plurality of pixel units configured to be switchable between a light scattering state and a light transmission state; wherein the transparent display panel further includes: a transparent holographic film located between the first substrate and the liquid crystal assembly.

In some embodiments, the direction of passing the object beam is set to point to the light guiding direction of the holographic film along the light incident portion and passing through the first substrate serving as a light guide, and the reference When the direction of the light beam is set to be perpendicular to the direction of the holographic film to form the interference pattern, once the holographic film on which the interference pattern has been formed is irradiated by an incident light beam in the same direction as the object beam, The light beam that passes through the holographic film and exits toward the liquid crystal component also propagates in a direction perpendicular to the holographic film.

In some embodiments, the holographic film is recorded with an interference pattern formed by an object beam and a reference beam, and at least a part of the incident beam is irradiated onto the first surface through the light incident portion and the reference beam When the interference pattern is formed, the light beam irradiates the holographic film in the same direction.

In some embodiments, the angle between the reference beam and the object beam is greater than 30 degrees.

In some embodiments, the angle between the reference beam and the object beam is greater than 90 degrees.

In some embodiments, the refractive index of the holographic film is greater than or equal to the refractive index of the first substrate.

In some embodiments, the refractive index of the part in contact with the holographic film in the liquid crystal component is greater than or equal to the refractive index of the holographic film.

In some embodiments, the plurality of pixel units are arranged in a matrix, and the holographic film includes a plurality of strip portions arranged at intervals, and the orthographic projection of each strip portion on the liquid crystal component falls within the matrix The range of a column of pixel units.

In some embodiments, the at least one light incident portion only includes a first light incident portion located at one side of the first substrate, and the plurality of strip-shaped portions are farther away from the first light incident portion. The area of the orthographic projection of the near strip portion on the first surface of the first substrate is smaller.

In some embodiments, the at least one light incident portion includes a first light incident portion and a second light incident portion respectively located at opposite sides of the first substrate, and the plurality of strip portions are located at the first The area of the orthographic projection on the first surface of the substrate gradually increases from both sides to the middle of the transparent display panel.

In some embodiments, the liquid crystal assembly includes a polymer dispersed liquid crystal layer.

In some embodiments, the liquid crystal assembly includes: a polymer network stabilized liquid crystal layer, the polymer network stabilized liquid crystal layer including a fourth surface facing the first substrate and a fifth surface facing the second substrate; a first alignment layer , Located on the fourth surface of the polymer network stabilized liquid crystal layer; and a second alignment layer, located on the fifth surface of the polymer network stabilized liquid crystal layer.

In some embodiments, the transparent display panel further includes: a first electrode layer located on a side of the liquid crystal component away from the second substrate; and a second electrode layer located on a side of the liquid crystal component away from the first substrate One side, wherein the first electrode layer and the second electrode layer are configured to control the plurality of pixel units to switch between a light scattering state and a light transmitting state.

In some embodiments, the second substrate includes a third surface close to the first substrate, the first electrode layer is located on the second surface of the first substrate, and the second electrode layer is located on the first substrate. Two on the third surface of the substrate.

In some embodiments, the second substrate includes a third surface close to the first substrate and a sixth surface away from the first substrate, and the transparent display panel further includes a light absorbing part arranged on the second substrate The outer peripheral surface of the peripheral surface is located between the third surface and the sixth surface.

In some embodiments, the transparent display panel further includes a light source arranged to face the light incident part and configured to provide the incident light beam.

The embodiment of the present disclosure also provides a method for manufacturing a transparent display panel, including the steps of: providing a first substrate and a second substrate, the first substrate including a first surface close to the second substrate, and a surface facing away from the second substrate. A second surface, and at least one light incident portion located between the first surface and the second surface at at least one side and configured to receive an incident light beam; forming a liquid crystal located between the first substrate and the second substrate A component, the liquid crystal component having a plurality of pixel units configured to be switchable between a light scattering state and a light transmitting state; and a holographic film formed between the first substrate and the liquid crystal component.

In some embodiments, before the liquid crystal assembly is disposed between the first substrate and the second substrate and combined with the first substrate and the second substrate, the method of fabricating the holographic film on the first surface of the first substrate is performed. .

In some embodiments, the step of fabricating a holographic film on the first surface of the first substrate includes: coating a photosensitive material layer on the first surface of the first substrate; and using a reference beam and an object beam to treat the The photosensitive material layer is exposed to light to form an interference pattern in the photosensitive material layer; and a holographic film is formed by developing the exposed photosensitive material layer on which the interference pattern is formed.

In some embodiments, the step of exposing the photosensitive material layer using a reference beam and an object beam to form an interference pattern in the photosensitive material layer includes: using a mask to expose the reference beam and the object beam to the While the photosensitive material layer is exposed to light, a pattern of a plurality of strips separated from each other is formed in the photosensitive material layer.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present disclosure more clearly, the drawings of the embodiments will be briefly described below. It should be understood that the drawings described below only refer to some embodiments of the present disclosure, not to the present disclosure. Of restrictions, where:

FIG. 1 shows a schematic structural diagram of a transparent display panel according to an embodiment of the present disclosure;

2 shows a schematic structural diagram of another transparent display panel according to an embodiment of the present disclosure;

FIG. 3A shows a schematic diagram of holographic interference pattern formation in the related art;

3B shows a schematic diagram of interference pattern formation in a holographic film in a transparent display panel according to an embodiment of the present disclosure;

4 shows a schematic structural diagram of still another transparent display panel according to an embodiment of the present disclosure;

FIG. 5 shows a schematic structural diagram of yet another transparent display panel according to an embodiment of the present disclosure;

FIG. 6 schematically shows an example of the positional relationship between a pixel unit and a holographic film in a transparent display panel according to an embodiment of the present disclosure;

FIG. 7A shows a schematic diagram of an example of a first electrode layer and a second electrode layer in a transparent display panel according to an embodiment of the present disclosure;

FIG. 7B illustrates a schematic diagram of another example of the first electrode layer and the second electrode layer in the transparent display panel according to an embodiment of the present disclosure;

FIG. 8 shows a flowchart of a method for manufacturing a transparent display panel according to an embodiment of the present disclosure;

FIG. 9 schematically shows a specific example of step S20 in FIG. 8; and

FIG. 10 schematically illustrates a process of forming a holographic film in a transparent display panel according to an embodiment of the present disclosure.

detailed description

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

The drawings are used to illustrate the content of the present disclosure. The size and shape of the components in the drawings do not reflect the true proportions of the components of the transparent display panel.

Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by those with ordinary skills in the field to which this 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 "a" or "an" does not exclude a plurality. "Include" or "include" and other similar words mean that the element or item appearing before the word encompasses the element or item listed after the word and its equivalents, but does not exclude other elements or items. Similar words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", "Top" or "Bottom", etc. are only used to indicate the relative position relationship. When the absolute position of the described object changes, the relative position relationship may also be corresponding To change. When an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element can be "directly" on or "under" the other element, or There may be intermediate elements.

According to the general technical idea of the embodiment of the present disclosure, in an aspect of the embodiment of the present disclosure, a transparent display panel 100 is disclosed. As shown in FIG. 1, the transparent display panel 100 includes: a first substrate 10, a second substrate 20, a liquid crystal assembly 30 between the first substrate 10 and the second substrate 20, and a liquid crystal assembly 30 between the first substrate 10 and the liquid crystal assembly. 30 between the holographic film 40. The holographic film 40 may be made of a transparent material. More specifically, the first substrate 10 includes: a first surface 11 close to the second substrate 20, a second surface 12 away from the second substrate 20, and a second surface 12 located between the first surface 11 and the second surface 12 At least one light incident portion 13 at at least one side portion of the first substrate 10 and configured to receive the incident light beam 50. The second substrate 20 includes a third surface 21 close to the first substrate 10, an observation side surface opposite to the third surface 21 and facing the observer, and a gap between the third surface 21 and the observation side surface. Between the second substrate body. The holographic film 40 is formed on the first surface 11 of the first substrate 10, for example. The liquid crystal assembly 30 has a plurality of pixel units 31, and each pixel unit 31 has at least two states of a light scattering state and a light transmitting state, and is configured to be able to switch between the light scattering state and the light transmitting state according to whether power is applied or not More specifically, for example, each of the plurality of pixel units 31 in the liquid crystal assembly 30 is in a light-transmitting state in the non-energized state and in a light-scattering state in the energized state; or alternatively, for example, liquid crystal Each pixel unit of the plurality of pixel units 31 in the assembly 30 is in a light-transmitting state in the energized state and is in a light-scattering state in the un-energized state. Different pixel units 31 in the liquid crystal assembly 30 may assume different states (such as one of a light scattering state and a light transmission state). When the pixel unit 31 is in the light scattering state, the pixel unit 31 will present a fuzzy state similar to "ground glass" under the irradiation of the light beam. This is the same as the transparent form observed by the user when the pixel unit 31 is in the light transmission state. Different. The contrast between the two states in the display effect can be used to form an image.

Since this solution does not require structures such as polarizers and filters, the transparent display panel 100, compared with related liquid crystal panels, can be used when the plurality of pixel units 31 in the liquid crystal assembly 30 are in a light transmission state. It has better transparency, so that the user can observe the scene behind the transparent display panel 100 through the transparent display panel 100. In this article, "transparent display panel" means a display panel for transparent display, which can facilitate the observer to observe the scene behind the transparent display panel through the display panel while displaying images to the observer.

In some embodiments, the liquid crystal assembly 30 may include a composite film layer of polymer and liquid crystal. For example, the composite film layer may be constructed based on a polymer dispersed liquid crystal (PDLC) material or a polymer network stabilized liquid crystal (PSLC) material.

In an exemplary embodiment, the polymer dispersed liquid crystal (PDLC) material is formed by liquid crystal dispersed in an organic solid polymer matrix in the form of droplets (for example, on the order of micrometers); specifically, the PDLC is made of a polymer film layer The liquid crystal component 30 of the form is prepared, for example, by dispersing liquid crystal molecules in the form of droplets in which the optical axis orientation is disorderly arranged in an organic solid polymer matrix contained in a liquid crystal cell. In addition, since the respective optical axes of the droplets composed of liquid crystal molecules are in 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 dispersion when the polymer is incident When the light in the liquid crystal material passes through its polymer matrix, it is scattered in all directions by the droplets dispersed in the polymer matrix. Therefore, the polymer dispersed liquid crystal material is in an opaque or semitransparent state (ie, light Scattering state). When an electric field has been applied to the polymer dispersed liquid crystal material, the optical axis orientation of the liquid crystal droplets can be adjusted to be aligned along the applied electric field. When the refractive index of the liquid crystal molecules matches the refractive index of the polymer matrix When the light incident into the polymer dispersed liquid crystal material passes through its polymer matrix, it is transmitted through it (rather than being scattered by the droplets dispersed in the polymer matrix). The light is in a transparent state (that is, a 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 polymer dispersed liquid crystal materials can be used to control the intensity of light transmitted through the PDLC film by changing the voltage thereon.

In an alternative exemplary embodiment, a polymer network stabilized liquid crystal (PSLC) material is an optoelectronic composite material in which a small amount of polymer forms a network to stabilize the orientation of liquid crystals; specifically, a liquid crystal made of PSLC in the form of a polymer film layer The component 30 is prepared, for example, by filling ordinary liquid crystal molecules and polymerizable liquid crystal monomers in a liquid crystal cell, and applying UV light to form a polymer network; in other words, the polymer is distributed throughout the liquid crystal matrix in the form of a network. Due to the different alignment and orientation of the liquid crystal molecules in the polymer network stabilized liquid crystal material in the polymer network, the optical anisotropy between the liquid crystal matrix and the polymer network causes the refractive index change of the composite film made of the polymer network stabilized liquid crystal material , When the electric field is not applied or the power is turned off, the liquid crystals are arranged in a spiral or perpendicular to the substrate, etc., so that the light incident on the composite film is arranged in this spiral direction or perpendicular to the substrate. The regular arrangement direction, such as the direction of, shows high light transmittance (rather than being scattered), so the polymer network stabilized liquid crystal material presents a transparent state (that is, a light transmission state) to the light incident therein. However, when a proper electric field has been applied, the stabilized orientation of the liquid crystal is destroyed, and the anchoring effect between the polymer network and the liquid crystal by the network will limit the reorientation of some liquid crystals in the electric field to tend to differ from others. The tendency of the liquid crystal to be uniform (that is, the liquid crystal will not be uniformly arranged along the electric field under the limitation of the polymer network), so that the liquid crystal molecules are arranged disorderly, and the entire polymer film layer shows different refractive indexes for the light incident into it (specifically , That is, the difference in refractive index is formed throughout the entire polymer film layer), thereby scattering the incident light (ie, the polymer network stabilizes the liquid crystal material in a light scattering state). The polymer network stabilizes the above-mentioned characteristics of the liquid crystal material, and can also be used to control the light intensity passing through the PSLC film by changing the voltage thereon.

As an example, a liquid crystal component based on a polymer network stabilized liquid crystal material can form a polymer network by irradiating with ultraviolet light after filling ordinary liquid crystal molecules and polymerizable liquid crystal monomers in a liquid crystal cell. Affected by the polymer network, the response speed of the liquid crystal can reach about 1 millisecond, for example. Liquid crystal components based on polymer dispersed liquid crystal materials can also be fabricated in a similar manner, which will not be repeated here.

In some embodiments, each pixel unit 31 contains a polymer network stabilized liquid crystal material or a polymer dispersed liquid crystal material. For example, a voltage applied on both sides of the polymer network stabilized liquid crystal material or polymer dispersed liquid crystal material can be used. To control the state switching of each pixel unit 31 to obtain a display image.

In some embodiments, the liquid crystal assembly 30 may include a polymer dispersed liquid crystal layer 32, as shown in FIG. 2. In other embodiments, as shown in FIG. 1, the liquid crystal component 30 may include a polymer network stabilized liquid crystal layer 33. In the case where the liquid crystal assembly 30 includes a polymer network stabilized liquid crystal layer 33, a first alignment layer 34 and a second alignment layer 35 may be respectively provided on both sides of the normal direction of the polymer network stabilized liquid crystal layer 33. For example, the polymer network stable liquid crystal layer 33 may have a fourth surface 24 facing the first substrate 10, a fifth surface 25 facing the second substrate 20, and a liquid crystal cell defined between the fourth surface 24 and the fifth surface 25. (The liquid crystal cell contains the liquid crystal matrix and the polymer network therein), the first alignment layer 34 may be located on the fourth surface 24 of the polymer network stabilized liquid crystal layer 33, and the second alignment layer 35 may be located on the polymer network. On the fifth surface 25 of the stable liquid crystal layer 33, that is, the first alignment layer 34 and the second alignment layer 35 are located on two opposite surfaces of the stable liquid crystal layer 33.

The holographic film 40 may be at least partially transparent (ie, include a plurality of first segments made of a transparent material), and it is configured to homogenize the light transmitted therethrough through the arrangement of the light-transmitting portion Distribution, thereby improving the display uniformity of the transparent display panel 100, especially when the incident light beam 50 is incident from the side of the first substrate 10 as shown in FIG. 1 (ie, an edge light source). If the holographic film 40 is not provided, when the incident light beam 50 irradiates the pixel unit 31 in the light transmission state after entering the first substrate 10, most of the light beam will pass through the second substrate 20 approximately along the original direction. As a result, when the user observes the transparent display panel 100 in the direction facing the incident light beam, the user will feel very strong brightness, while in other directions, the brightness will be weak. In other words, without the holographic film, the incident light beam 50 has a relatively concentrated exit direction after passing through the liquid crystal assembly 30 and the second substrate 20, which results in uneven brightness of the light exiting the second substrate 20. In the presence of the holographic film 40, the holographic film 40 can be used to make the incident beam 50 follow the original reference beam direction after passing through the holographic film, that is, vertically downward, and it is easy to change each stripe in the holographic film 40. The area of the shaped portion 41 makes the light intensity distribution of the emitted light beam of the transparent display panel more uniform, so that the emission direction is relatively dispersed after passing through the liquid crystal assembly 30 and the second substrate 20, so as to homogenize the brightness distribution of the emitted light, thereby improving The brightness uniformity of the light emitted from the second substrate 20 after passing through the holographic film (and then passing through the liquid crystal assembly 30).

When the liquid crystal component of polymer dispersed liquid crystal is in a light transmission state under the condition of applying an electric field (that is, it is energized), or the liquid crystal component of polymer network polymerized liquid crystal is in a light transmission state under the condition of no electric field (that is Above, the entire display panel is in a transparent display state, that is, the user can not only watch the content displayed by the liquid crystal components of the panel at the same time, but also can view the background scene behind the panel through the panel. The background scene is used for the user to observe the backside situation. When the liquid crystal component of polymer dispersed liquid crystal is in a light scattering state under the condition of no electric field (ie power is off), or when the liquid crystal component of polymer network polymerized liquid crystal is in a light scattering state under the condition of applying an electric field (ie power on), In essence, the entire display panel is in an opaque display state, that is, the panel is in the state of an ordinary opaque panel. At this time, the user can only watch the content displayed by the liquid crystal component of the panel itself, and cannot observe the background behind the panel at the same time. Scenery.

The principle of holographic projection is that holographic projection technology is a virtual imaging technology that uses the principles of interference and diffraction to record and reproduce real three-dimensional images of objects. The first step is to use the principle of interference to record the light wave information of the object. This is the shooting process, in which a part of the laser is irradiated to the object to form an object beam that diffuses from the object; the other part of the laser is used as a reference beam and is incident on the holographic film , Superimposed with the object beam to produce interference, convert the phase and amplitude of each point on the object light wave into a spatially varying intensity, thereby using the contrast and interval between the interference fringes to record all the information of the object light wave, which becomes a hologram Figure. The second step is to use the principle of diffraction to reproduce the light wave information of the object, which is the imaging process, in which the hologram actually acts as a complex grating.

3A shows a schematic diagram of holographic interference pattern formation in the related art; FIG. 3B shows a schematic diagram of interference pattern formation in a holographic film in a transparent display panel according to an embodiment of the present disclosure. Specifically, in the related art, as shown in FIG. 3A, an interference pattern formed by exposing, developing, and fixing the object beam and the reference beam is recorded on the holographic film. The interference is superimposed on the film, and the amplitude information of the object beam is converted into the contrast of light and dark of the interference pattern, and the phase information of the object beam is converted into the fringe shape and density distribution of the interference pattern and recorded. In an embodiment of the present disclosure, it can be known from the principle of holographic recording that the propagation direction of the object beam 51 used to expose, develop, and fix the holographic film 40 to form a predetermined interference pattern thereon is set to, for example, Along the light guide direction that is incident from the light incident portion 13 and directed to the holographic film 40 through the first substrate 10 serving as a light guide, and will be used to expose, develop, and fix the holographic film 40 to form a predetermined interference pattern thereon The reference beam 52 of is set, for example, in the vertical downward direction of FIG. 3B, thereby forming a holographic film with a predetermined interference pattern after exposure, development, and fixing processes. Furthermore, after the holographic film 40 on which the interference pattern has been recorded is prepared, in an embodiment where the holographic film 40 of the present invention is applied to a transparent display panel, when the holographic film 40 is used with the transparent display panel, When the original object beam 51 (that is, the object beam used to form an interference pattern on the holographic film 40 in advance) is irradiated with beams in the same direction, the beam emitted from the holographic film 40 will have, for example, the original reference beam 52 that is vertically downward. (Ie, the reference beam 52 used to form an interference pattern on the holographic film 40 in advance) propagates in the direction. Thus, using such properties of the holographic film 40, for example, the direction in which at least a part of the incident light beam 50 is irradiated onto the first surface 11 through the light incident portion 13 is set to be the same as that of the first substrate 10 serving as a light guide. The light guiding direction is the same, that is, the direction of the original light beam 51 is the same, the direction of the outgoing beam formed by the incident light beam 50 passing through the holographic film 40 and the reference beam 52 irradiate the holographic film 40 when the interference pattern is formed. Therefore, the holographic film is used to achieve the deflection of the propagation direction of the incident light beam in a specific incident direction (that is, the direction consistent with the original beam direction forming the holographic film interference pattern) (hereinafter referred to as the refractive effect), that is, The resulting outgoing beam will propagate along the propagation direction of the original reference beam (here, that is, the original reference beam originally set in the vertical downward direction of propagation). In this way, it is possible to use the refractive effect of the holographic film 40 to change the intensity of the emitted light of the transparent display panel, and realize the normal incident light beam to the layer of the liquid crystal component 30; and since the light incident on the liquid crystal component 30 is in the normal direction of the panel It is only necessary to adjust the distribution density of this normal beam to facilitate the specific description in the following embodiments to improve the uniformity of brightness.

In some embodiments, the angle between the object beam 51 and the reference beam 52 may be, for example, an acute angle or a right angle greater than 30 degrees, or even an obtuse angle greater than 90 degrees. In some embodiments, a light absorbing part 60 may be additionally arranged on the outer peripheral surface 22 of the second substrate 20 for absorbing the emission direction of the part of the light beam changed to the periphery of the second substrate 20 by the holographic film 40. It is especially effective when the angle between the object beam 51 and the reference beam 52 is large. The outer peripheral surface 22 may be located between the third surface 21 of the second substrate 20 and the sixth surface 23 serving as the aforementioned observation side surface, at the side of the second substrate 20, the sixth surface 23 being the second The substrate 20 faces away from the surface of the first substrate 10.

For the case where the incident light beam 50 is incident obliquely as shown in FIG. 1, it is expected that when the pixel unit 31 is in a light transmission state, the pixel unit 31 is visually in a transparent state, especially for the ambient light from the back side of the panel, and the pixel unit 31 31 also displays the display content expected to be presented by the light beam from the light incident portion 13 incident on the liquid crystal assembly 30 through the holographic film. In this case, the stronger light beam transmitted from the pixel unit 31 is undesirable, because if the pixel unit 31 allows such an undesired stronger light beam to pass through, it may affect the visual effect (such as bright spots and low brightness). Evenly, etc.). Through the above-mentioned refraction effect of the holographic film 40 on the light beam and the light absorption effect of the light absorption part, these undesired light beams can be weakened or suppressed.

The pixel unit 31 in a different state is shown in FIG. 1. In the figure, the position of each pixel unit 31 is roughly drawn with parallel dashed lines, and the area between two adjacent dashed lines can be regarded as one pixel unit 31. The incident light beam (indicated by a solid single arrow) in Figure 1 after passing through the holographic film 40 becomes along the direction of the object beam and the reference beam (indicated by the solid double arrow in Figure 1) forming the interference pattern in the holographic film 40. Two beams of light entering the liquid crystal assembly 30. The leftmost pixel unit in FIG. 1 is schematically illustrated as being in a light-transmitting state, therefore, the two beams of light can respectively be transmitted through the liquid crystal assembly 30 there. The third pixel unit 31 from the left in FIG. 1 is schematically shown as being in a light scattering state. Therefore, two beams of light incident on the liquid crystal assembly 30 are scattered by the pixel unit 31 in various directions (in FIG. The hollow arrow indicates).

In some embodiments, the refractive index of the holographic film 40 (especially the holographic film 40, for example, including the plurality of first sections made of a transparent first material) is selected to be greater than or equal to the refractive index of the first substrate 10, for example. This can prevent the incident light beam 50 entering the first substrate 10 from being totally reflected at the interface between the first substrate 10 and the holographic film 40. Similarly, in some embodiments, the refractive index of the portion of the liquid crystal assembly 30 that is in contact with the holographic film 40 (for example, the polymer dispersed liquid crystal layer 32 or the first alignment layer 34, etc.) may be greater than or equal to the refractive index of the holographic film 40. This can prevent the incident light beam 50 entering the first substrate 10 from being totally reflected at the interface between the holographic film 40 and the liquid crystal assembly 30.

In some embodiments, the holographic film 40 may be designed in a discrete form, that is, the holographic film 40 includes a plurality of strip portions 41 arranged at intervals from each other to serve as the plurality of first sections. As shown in FIG. 6, a plurality of pixel units 31 in the liquid crystal assembly 30 are arranged in a matrix form. The matrix may include multiple rows of pixel units 31 and multiple columns of pixel units 31. Each rectangular block in FIG. 6 represents a pixel unit 31. In FIG. 6, the horizontal direction can be regarded as the row direction, and the vertical direction can be regarded as the column direction. However, the embodiments of the present disclosure are not limited to this, and “row” and “column” in this text should not be understood It constitutes any specific limitation on the arrangement direction of the pixel units 31. The orthographic projection of each strip 41 in the holographic film 40 on the liquid crystal assembly 30 at least partially overlaps with a column of pixel units 31 in the matrix; more specifically, for example, each strip 41 in the holographic film 40 The orthographic projection on the liquid crystal component 30 falls within the range of the orthographic projection of a column of pixel units 31 in the matrix on the liquid crystal component 30. And, as an example, the gap between two adjacent strip portions 41 can be filled with a medium 42 having a refractive index lower than that of the first substrate 10 (for example, making the incident light beam 50 between the first substrate 10 and the The interface between the media 42 satisfies the condition of total reflection), the media 42 is, for example, a second material that is different from the transparent first material, so that the media 42 forms the basis of the holographic film 40 The plurality of second sections are spaced apart from the plurality of first sections. In this way, when the incident light beam 50 irradiates the position between the two strips 41 (that is, irradiates the corresponding second section 42 between the two first sections 41), it may be caused by the incident light beam 50 from The optically dense medium (here, the first substrate 10) propagates toward the optically thin medium (here, the medium 42 with a lower refractive index than the first substrate 10) and total reflection occurs at the interface between the two The role of the without shooting. This design of the holographic film 40 can appropriately (at the medium 40) reduce the amount of light entering the liquid crystal assembly 30 from the first substrate 10, thereby ensuring that the first substrate 10 has sufficient backlight intensity. The first substrate 10 can be regarded as a light guide plate.

In this case, the area of each strip 41 in the holographic film 40 can be changed for each column of pixel units 31, so as to make the light intensity distribution of the emitted light beam of the transparent display panel more uniform. For example, as shown in FIG. 1 where the incident light beam 50 enters the first substrate 10 from the left side, the intensity of the incident light beam 50 irradiated on each part of the holographic film 40 after entering the first substrate 10 is actually different. The portion of the holographic film 40 that is closer to the light incident portion 13 receives the greater light intensity. On the one hand, this is because the light intensity distribution of the incident beam 50 at a position closer to the light entrance portion 13 is more concentrated and the light intensity distribution at a position farther from the light entrance portion 13 is more dispersed. The light intensity of the light beam 50 is attenuated as the incident light beam 50 propagates in the first substrate 10. For this reason, as shown in FIG. 1, in the case where only the light incident portion 13 (first light incident portion 131) located at one side (one side portion in the figure) of the first substrate 10 is included, the holographic film 40 It is configured such that, among the plurality of strip portions 41 in the holographic film 40, the closer the strip portion 41 to the first light incident portion 131 is, the smaller the area of the orthographic projection on the first surface 11 of the first substrate 10 is. The smaller the area of the orthographic projection of the strip portion 41 on the first surface 11 of the first substrate 10 is, it means that the intensity of the light beam emitted from the position on the first substrate 10 corresponding to the strip portion 41 is also lower. The “corresponding location” here means, for example, a location on the first substrate that at least partially overlaps with the projection of the strip portion 41 on the first substrate 10. Therefore, by adjusting the area of the strip portion 41, the uniformity of the emitted light beam can be effectively improved.

In other examples, as shown in FIG. 4, incident light beams are incident on both sides of the first substrate 10. That is, at least one light incident portion 13 of the first substrate 10 includes a first light incident portion 131 and a second light incident portion 132 respectively located at opposite sides of the first substrate 10. In this case, the portions of the holographic film 40 close to the first light incident portion 131 and the second light incident portion 132 are both irradiated by a stronger light beam, and are different from the first light incident portion 131 and the second light incident portion 132. The middle part of the holographic film 40 that is far away from each other has a lower intensity of the light beam received. Therefore, the holographic film 40 may be arranged such that the area of the orthographic projection of the plurality of strip portions 41 on the first surface 11 of the first substrate 10 gradually increases from both sides to the middle of the transparent display panel. In this way, by adjusting the area of the strip portion 41, it is convenient for the light beam from the side light source to enter the light incident portion 13 to propagate through the first substrate 10 and the holographic film 40 as described above. The normal light directed to the liquid crystal assembly 30 adjusts the density distribution on a plane parallel to the first substrate and the second substrate. Thus, the holographic film 40 can also effectively improve the uniformity of the emitted light beam.

In some embodiments, the transparent display panel 100 may further include: a first electrode layer 71 and a second electrode layer 72. The first electrode layer 71 and the second electrode layer 72 are made of a transparent conductive material, such as ITO (Indium Tin Oxide). Wherein, the first electrode layer 71 may be located on the side of the liquid crystal assembly 30 facing away from the second substrate 20 (more specifically, directly on the surface of the liquid crystal assembly 30 facing away from the second substrate 20, or alternatively such as As shown in the figure, located on the side of the first substrate 10 adjacent to the liquid crystal assembly 30 away from the second substrate 20), the second electrode layer 72 may be located on a side of the liquid crystal assembly 30 away from the first substrate 10. side. The first electrode layer 71 and the second electrode layer 72 may be configured to control the plurality of pixel units 31 to switch between a light scattering state and a light transmitting state. As mentioned above, the liquid crystal assembly 30 can be changed by the electric field applied between the first electrode layer 71 and the second electrode layer 72. For example, for a liquid crystal assembly based on polymer dispersed liquid crystal material, the pixel unit 31 thereon When an appropriate electric field is applied, it is in a light transmission state, and after the electric field is removed, it is in a light scattering state. Similarly, for a liquid crystal component based on a polymer network stabilized liquid crystal material, its state switching under power-on and power-off conditions is opposite to that of a liquid crystal component based on a polymer dispersed liquid crystal material; that is, specifically, based on a polymer network stable The pixel unit 31 on the liquid crystal component of the liquid crystal material is in a light scattering state when an appropriate electric field is applied, and will be in a light transmitting state after the electric field is removed.

In some embodiments, in order to achieve point-by-point control of corresponding pixels (here and below, "corresponding" means that the orthographic projections of each other on the first or second substrate at least partially overlap, and more typically, for example, completely Overlapping), for example, one of the first electrode layer 71 and the second electrode layer 72 is a strip electrode, and the other is a point electrode (block, round, square, etc.), strip electrode or surface electrode. More specifically, as shown in FIG. 7A, one of the first electrode layer 71 and the second electrode layer 72 may be arranged in the form of a dot electrode array, where each dot electrode 711 corresponds to a pixel on the liquid crystal assembly 30, and The other of the first electrode layer 71 and the second electrode layer 72 can be arranged in the form of a surface electrode, where “corresponding to” means that the orthographic projection of each dot electrode 711 on the liquid crystal assembly 30 and the projection of the dot electrode 711 on the liquid crystal assembly 30 A corresponding pixel at least partially overlaps, for example, falls within the range of the latter. By addressing each dot electrode 711, the voltage on both sides of each pixel unit 31 can be controlled.

In other embodiments, as shown in FIG. 7B, the first electrode layer 71 includes a plurality of first electrode strips 712 arranged in parallel, and the second electrode layer 72 includes a plurality of second electrode strips 722 arranged in parallel. The extending direction of the first electrode strip 712 and the extending direction of the second electrode strip 722 are perpendicular to each other. Each pixel unit 31 corresponds to an intersection of the first electrode bar 712 and the second electrode bar 722. Here, "corresponding to" means that the orthographic projection of each pixel unit 31 on, for example, the liquid crystal assembly 30 and the first For example, the orthographic projection of an electrode strip 712 on the liquid crystal assembly 30 and the orthographic projection of the second electrode strip 722 on, for example, the liquid crystal assembly 30, the intersection of the two orthographic projections at least partially overlap. When a certain pixel unit 31 is desired to change its state, it can be achieved by energizing the corresponding first electrode strip 712 and the second electrode strip 722. In this way, the voltages on both sides of each pixel unit 31 can also be controlled by controlling each first electrode strip 712 and second electrode strip 722.

The arrangement of the first electrode layer 71 and the second electrode layer 72 in the embodiment of the present disclosure is not limited to the form shown in FIG. 7A and FIG. 7B, and those skilled in the art can adopt any known electrode arrangement form in the art. For example, the first electrode layer 71 and the second electrode layer 72 may also be arranged in the form of dot electrodes; or the first electrode layer 71 and the second electrode layer 72 may also be arranged in the form of one of the dot electrodes and the other Is the form of strip electrodes and so on.

In some more specific embodiments, the first electrode layer 71 may be located on the second surface 12 of the first substrate 10, and the second electrode layer 72 may be located on the third surface 21 of the second substrate 20. The first electrode layer 71 is formed on the second surface 12 of the first substrate 10 facing the first substrate 10, which can avoid the formation of the holographic film 40 on the same side surface of the first substrate 10, which can prevent the formation of the first substrate. The process of the electrode layer 71 affects the holographic film 40, especially when the first electrode layer 71 is formed by high-temperature evaporation. However, the embodiments of the present disclosure are not limited thereto, and the first electrode layer 71 and the second electrode layer 72 may also be located in other positions. For example, the second electrode layer 72 may be located on the surface of the second substrate 20 facing away from the first substrate 10 ( That is, on the sixth surface 23) serving as the aforementioned observation side surface.

In some embodiments, the transparent display panel 100 may further include a light source 80. The light source 80 is arranged facing the light incident part 13 and configured to provide the incident light beam 50. In some embodiments, the transparent display panel 100 may only include a light source 80 located at one side of the first substrate 10, as shown in FIG. 1. In other embodiments, the transparent display panel 100" may include a first light source 81 and a second light source 82 respectively located at opposite sides of the first substrate 10. As shown in FIG. 4, the first light source 81 And the second light source 82 are respectively arranged close to and directed toward the first light incident portion 131 and the second light incident portion 132. In an embodiment of the present disclosure, the light source may be any light source known in the art, including light emitting diodes, filaments , Fluorescent tubes, etc. In some embodiments, the light source can be monochromatic or multicolor. For the liquid crystal component 30 film layer of PDLC and PSLC, for example, a single grayscale display can be simply controlled. Typically For example, only a monochromatic light source is used at the light source to realize the monochromatic display of the panel.

However, if it is expected to achieve a color display effect, due to the thicker liquid crystal cells such as PDLC and PSLC and the slower response speed, the control method of adjusting the voltage value of the pixel electrode to realize the grayscale display of the conventional liquid crystal panel is not effective. good. Therefore, it can only be considered to achieve the desired color display by making specific settings at the light source. For example, in order to achieve a colorful display effect, it is possible to provide incident light beams of different colors by switching multiple light sources with different colors at a relatively high frequency (frequency indistinguishable from the naked eye). The specific principle can be summarized as follows: through the sub-light sources of each pure color and single color (such as R/G/B) configured at the light source to switch the display at different times to form each monochromatic light source (for example, If the R sub light source is a first number of multiple sub light sources with different gray levels, the R monochromatic light source including these R sub light sources has only the first number of gray levels; similarly, this situation is also applicable to G monochromatic Monochromatic light source and B monochromatic light source), and then, for example, each monochromatic light source of R/G/B (including several monochromatic sub-light sources of respective specific gray levels) is also switched and displayed at different times, and different monochromatic light sources are indistinguishable from the naked eye. The colors are then mixed to achieve limited grayscale display.

In a specific exemplary embodiment, for example, the multiple light sources of different colors are three types of light sources of R, G, and B. For example, the R light source includes two different gray levels of 100 and 255 (ie (255, 0, 0) , (100,0,0)) pure red monochromatic sub-light source, G light source includes 100, 255 two different gray scales (ie (0,255,0), (0,100,0)) pure green monochromatic Light source, B light source includes 100, 255 two different gray levels (ie (0,0,255), (0,0,255)) pure blue monochromatic sub-light source. In essence, in the embodiment of the present invention, on the one hand, for the display content expected to be displayed by the light beam from the light incident portion 13 through the holographic film and normally incident on the liquid crystal assembly 30 to be resolved and displayed by each pixel unit 31 In fact, in order to achieve color grayscale display, it is essentially necessary to switch between the same monochrome and different grayscales at the light source at a very high frequency (far higher than the frequency perceivable by the human eye), that is, the monochromatic sub-light source group Switching between different gray-scale sub-light sources, (for example, the switching of 100 gray-scale sub-light sources of R pure red and 255 gray-scale sub-light sources), and the switching of different monochromatic colors (ie, the sub-lights of different colors of R, G, and B) Switch between light source groups). For a specific gray-scale monochromatic light incident from the light source at a certain moment, each pixel is switched between on or off under the action of the electric field applied to the liquid crystal component 30 of the PDLC or PSLC to control whether each pixel displays or not. The specific pure color light of the specific grayscale. Color mixing is achieved by performing the above two switchings (ie switching between sub-light sources of the same single color and different grayscales, and switching between R, G, and B sub-light source groups of different colors) at frequencies that are indistinguishable from the human eye. , Achieve limited gray scale color display. On the other hand, for the ambient light to be incident from the back side of the panel, each pixel of the panel changes according to the respective power-on or power-off states of the corresponding portion of the first electrode layer and the corresponding portion of the second electrode layer. Switch between the light scattering state and the light transmission state (especially for the ambient light on the back side of the panel) to realize the opaque state where the background scene behind the panel cannot be observed, or the background scene behind the panel can be observed respectively The transparent state switches between the two observable states of the background light.

In the embodiment of the present disclosure, the incident light beam 50 may be a collimated substantially parallel light beam, and may enter the first substrate 10 at an appropriate tilt angle.

In some embodiments, both the first substrate 10 and the second substrate 20 may be glass substrates, for example, both the first substrate 10 and the second substrate 20 are transparent.

FIG. 2 shows another transparent display panel 100' based on an embodiment of the present disclosure. The transparent display panel 100' includes a liquid crystal assembly 30 based on a polymer network stabilized liquid crystal material and has an incident light source located at a single side of the first substrate 10. FIG. 5 shows another transparent display panel 100"' based on an embodiment of the present disclosure. The transparent display panel 100"' includes a liquid crystal assembly 30 based on a polymer network stabilized liquid crystal material and has a first substrate 10. Incident light sources at opposite sides. Compared with the embodiment shown in FIGS. 1 and 4, the embodiment shown in FIGS. 2 and 5 only replaces the liquid crystal component 30 based on polymer network stabilized liquid crystal material with a liquid crystal component based on polymer dispersed liquid crystal material 30. The specific details will not be repeated.

The embodiment of the present disclosure also provides a method for manufacturing a transparent display panel. As shown in Figure 8, the method includes:

Step S10: providing a first substrate 10 and a second substrate 20;

Step S20: forming a holographic film 40 on the first surface 11 of the first substrate 10; and

Step S30: The liquid crystal assembly 30 is arranged between the first substrate 10 and the second substrate 20 and combined with the first substrate 10 and the second substrate 20, and the first surface 11 of the first substrate 10 is arranged toward the liquid crystal assembly 30.

In step S10, for example, the first substrate includes a first surface close to the second substrate, a second surface away from the second substrate, and located between the first surface and the second surface on at least one side. At least one light incident portion at the portion and configured to receive an incident light beam.

In step S30, for example, the liquid crystal assembly has a plurality of pixel units configured to be switchable between a light scattering state and a light transmitting state. When the first surface 11 of the first substrate 10 faces the liquid crystal assembly 30, the holographic film 40 can be located between the first substrate 10 and the liquid crystal assembly 30.

In some embodiments, as shown in FIG. 9, the step S20 includes:

Step S21: coating a photosensitive material layer on the first surface 11 of the first substrate 10;

Step S22: Expose the photosensitive material layer using a reference beam and an object beam to form an interference pattern in the photosensitive material layer; and

Step S23: The holographic film 40 is formed by developing the exposed photosensitive material layer with the interference pattern formed.

Figure 10 shows the process of making a holographic film. At stage (a) in FIG. 10, a blank first substrate 10 is provided. In the stage (b) in FIG. 10, the photosensitive material layer 90 is coated on the first surface 11 of the first substrate 10. The coating process can be completed by spin coating, for example. At stage (c) in FIG. 10, the reference beam 51 and the object beam 52 interfere with each other and expose the photosensitive material layer 90, so that an interference pattern is formed in the photosensitive material layer 90. If it is necessary to form a plurality of strips 41 separated from each other in the finally formed holographic film 40, in this stage (c), the photosensitive material layer 90 may be exposed using a mask 91, which may include The pattern corresponding to the plurality of strip-shaped portions 41, where “corresponding” refers to the orthographic projection of the pattern of the mask 91 on the photosensitive material layer 90 and the plurality of strip-shaped portions 41 on the photosensitive material layer 90 The orthographic projections overlap at least partially. Thus, a mask can be used to form a pattern of a plurality of stripe portions separated from each other in the photosensitive material layer while exposing the photosensitive material layer by the irradiation of the reference beam and the object beam. Thus, by using the mask 91 including the pattern corresponding to the plurality of strip portions 41 in the process of exposing the photosensitive material layer 90, a transparent first material is formed after exposure and development. A plurality of first sections that serve as the plurality of strip-shaped portions (the plurality of first sections are, for example, portions of the first material formed by developing the photosensitive material layer 90 that is blocked by the mask 91) Section, and the light incident on the first section will not be totally reflected), and a second section composed of a second material different from the first material and separated by the plurality of first sections (The plurality of second sections are, for example, sections of the second material formed by exposure and development of the portion of the photosensitive material layer 90 that is not blocked by the mask 91, and the light incident on the second section will be Total reflection occurs) holographic film 40. In some embodiments, the angle between the reference beam and the object beam may be greater than 30 degrees, for example greater than 90 degrees. At stage (d) in FIG. 10, the exposed photosensitive material layer with the interference pattern formed is developed to form a holographic film. This development process can be performed by a developer, for example.

In some embodiments, for example, in order to realize the aforementioned holographic film 40 including a plurality of strip portions 41 spaced apart from each other and a medium 42 interposed between adjacent strip portions 41, as an example, for example, After exposing, developing, and fixing processes to form a plurality of strips 41 spaced apart from each other, the holographic film layer only includes a plurality of strips spaced apart without other residual material. Correspondingly, for example, the step S20 further includes: forming a flattening compensation layer under the holographic film 40. In a specific embodiment, for example, the flattening compensation layer is formed by using a spin coating method to fill all the holographic film with a medium 42 (for example, a polyester material) having a refractive index lower than that of the first substrate 10. The plurality of strip-shaped parts 41 (that is, realized by filling the gap between adjacent strip-shaped parts 41 with the medium 42) and wrapping the holographic film from below are realized.

In a more specific embodiment, for example, a photopolymerizable double bond-containing acrylic polyester mixture is used to flatten the holographic grating (that is, the plurality of strips 41 spaced apart from each other) after high-speed rotation, and then irradiated with ultraviolet light. It is formed by curing.

In addition, for the PDLC liquid crystal components shown in FIGS. 2 and 5, when the first electrode layer 71 is a planar electrode, the second electrode layer 72 is, for example, a block electrode, and the second electrode layer 72 is, for example, a block electrode at the bottom. An electrode protection layer may be additionally formed between the electrode layer 72 and the PDLC liquid crystal component 30. The electrode protection layer is usually formed by a silicon oxide or silicon nitride process, as a transition layer to avoid the second electrode layer 72 and the PDLC liquid crystal component 30. Direct contact.

In an exemplary embodiment, for example, the step S20 of preparing a holographic film is essentially a preparation process of preparing a holographic film from a holographic dry plate, specifically including three processes of exposure, development, and fixing. The material that can be used to make such a holographic film that can record holographic information through the above process is, for example, a photopolymer film photosensitive material, including: a base film layer, a photopolymer photosensitive layer and a protective layer stacked in sequence , Wherein: the base film layer is one of PET film, PS film, cellulose acetate film or PVC film, the photopolymer photosensitive layer is coated with a photopolymer coating, and the protection The layer is one of silicone oil PET film, cellulose acetate film or PVC film. The above-mentioned photopolymer film photosensitive material has a simple structure, a wide range of raw materials, relatively low prices, and low environmental pollution. The polymer material has high diffraction efficiency and high sensitivity, and at the same time has excellent mechanical properties, heat resistance and weather resistance.

In addition, the preparation method of the photopolymer thin film photosensitive material used to prepare the holographic film, for example, includes: first preparing a photopolymer coating, and coating the photopolymer coating on On the base film layer, after it is leveled and dried, a protective layer is covered on the photopolymer surface to obtain the photopolymer film photosensitive material. The synthesis process is relatively simple and can be widely used in industrial production.

In some embodiments, as shown in FIG. 8, the manufacturing method of the transparent display panel further includes:

Step S40: before the holographic film is fabricated on the first surface 11 of the first substrate 10, a first electrode layer 71 is fabricated on the second surface 12 of the first substrate 10 opposite to the first surface 11, and on the second substrate A second electrode layer 72 is formed on the third surface 21 of 20 close to the first substrate 10.

This allows the first electrode layer 71 and the holographic film 40 to be formed on opposite sides of the first substrate 10 in the normal direction (the upper and lower sides are shown in the figure), and the first electrode layer can be formed before the holographic film 40 is made. 71. This can prevent conditions such as high temperature in the process of the first electrode layer 71 from adversely affecting the holographic film 40.

The above-mentioned manufacturing method of the transparent display panel is merely exemplary, and the embodiments of the present disclosure are not limited thereto.

Compared with related technologies, the embodiments of the present disclosure have the following superior technical effects:

The embodiment of the present disclosure proposes an exemplary transparent display panel and a manufacturing method thereof. Since this solution does not require structures such as polarizers, filters, etc., compared with related liquid crystal panels, the transparent display panel can have better performance when the plurality of pixel units in the liquid crystal assembly are in a light transmission state. The transparency, so that users can observe the scene behind the transparent display panel through the transparent display panel. In this article, "transparent display panel" means a display panel for transparent display, which can facilitate the observer to observe the scene behind the transparent display panel through the display panel while displaying images to the observer. The refraction effect of the holographic film on the light beam and the light absorption effect of the light absorption portion can weaken or suppress the undesired light beam. In addition, by adjusting the area of the plurality of strip-shaped portions arranged at intervals on the holographic film, the uniformity of the emitted light beam can also be effectively improved.

Although the present disclosure has been described with reference to the accompanying drawings, the embodiments disclosed in the accompanying drawings are intended to exemplify the embodiments of the present disclosure, and should not be understood as a limitation of the present disclosure. The size ratios in the drawings are only schematic and should not be construed as limiting the present disclosure.

The embodiments of the present disclosure are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

The above-mentioned embodiments only exemplarily illustrate the principle and structure of the present disclosure, but are not used to limit the present disclosure. Those skilled in the art should understand that any changes made to the present disclosure without departing from the general idea of the present disclosure And improvements are within the scope of this disclosure. The protection scope of the present disclosure shall be subject to the scope defined by the claims of this application.

Claims (20)

1. A transparent display panel, including:

   A first substrate and a second substrate. The first substrate includes a first surface close to the second substrate, a second surface away from the second substrate, and at least one surface located between the first surface and the second surface. At least one light incident portion at the side and configured to receive an incident light beam; and

   A liquid crystal assembly located between the first substrate and the second substrate, the liquid crystal assembly having a plurality of pixel units configured to be switchable between a light scattering state and a light transmitting state;

   Wherein, the transparent display panel further includes: a transparent holographic film located between the first substrate and the liquid crystal component.
2. The transparent display panel according to claim 1, wherein the holographic film is recorded with an interference pattern formed by an object beam and a reference beam, and at least a part of the incident beam is irradiated to the first surface through the light incident portion The upper direction is consistent with the direction in which the reference beam irradiates the holographic film when the interference pattern is formed.
3. The transparent display panel according to claim 2, wherein the direction in which the object light beam passes is set to be directed toward the holographic film along the light incident portion through the first substrate serving as a light guide. When the direction of light and the direction of the reference beam is set to be perpendicular to the direction of the holographic film to form the interference pattern, once the holographic film on which the interference pattern has been formed is the same as the object beam When the direction of the incident light beam is irradiated, the light beam that passes through the holographic film and exits toward the liquid crystal component also travels in a direction perpendicular to the holographic film.
4. The transparent display panel according to claim 1, wherein:

   The angle between the reference beam and the object beam is greater than 30 degrees.
5. The transparent display panel according to claim 4, wherein:

   The angle between the reference beam and the object beam is greater than 90 degrees.
6. The transparent display panel according to claim 1, wherein:

   The refractive index of the holographic film is greater than or equal to the refractive index of the first substrate.
7. The transparent display panel according to claim 1, wherein:

   The refractive index of the part in contact with the holographic film in the liquid crystal component is greater than or equal to the refractive index of the holographic film.
8. The transparent display panel according to any one of claims 1 to 7, wherein the plurality of pixel units are arranged in a matrix, and the holographic film includes a plurality of strips arranged at intervals, each stripe The orthographic projection on the liquid crystal component falls within the range of a column of pixel units in the matrix.
9. The transparent display panel according to claim 8, wherein the at least one light incident portion only includes a first light incident portion located at one side of the first substrate, and the plurality of strip-shaped portions are centered away from each other. The area of the orthographic projection of the stripe portion closer to the first light incident portion on the first surface of the first substrate is smaller.
10. The transparent display panel according to claim 8, wherein the at least one light incident portion includes a first light incident portion and a second light incident portion respectively located at opposite sides of the first substrate, the multiple The area of the orthographic projection of the strips on the first surface of the first substrate gradually increases from both sides to the middle of the transparent display panel.
11. The transparent display panel according to any one of claims 1 to 7, wherein the liquid crystal assembly includes a polymer dispersed liquid crystal layer.
12. 7. The transparent display panel according to any one of claims 1 to 7, wherein the liquid crystal assembly comprises:

    A polymer network stabilized liquid crystal layer, the polymer network stabilized liquid crystal layer including a fourth surface facing the first substrate and a fifth surface facing the second substrate;

    The first alignment layer is located on the fourth surface of the polymer network stabilized liquid crystal layer; and

    The second alignment layer is located on the fifth surface of the polymer network stabilized liquid crystal layer.
13. The transparent display panel according to any one of claims 1 to 7, further comprising:

    The first electrode layer is located on the side of the liquid crystal component away from the second substrate; and

    The second electrode layer is located on the side of the liquid crystal component away from the first substrate,

    Wherein, the first electrode layer and the second electrode layer are configured to control the plurality of pixel units to switch between a light scattering state and a light transmitting state.
14. 13. The transparent display panel according to claim 13, wherein the second substrate comprises a third surface close to the first substrate, the first electrode layer is located on the second surface of the first substrate, and the second substrate The second electrode layer is located on the third surface of the second substrate.
15. 8. The transparent display panel according to any one of claims 1 to 7, wherein the second substrate comprises a third surface close to the first substrate and a sixth surface away from the first substrate:

    The transparent display panel further includes a light absorption part arranged on an outer peripheral surface of the second substrate, and the outer peripheral surface is located between the third surface and the sixth surface.
16. The transparent display panel according to any one of claims 1 to 7, further comprising:

    A light source, the light source being arranged facing the light incident part and configured to provide the incident light beam.
17. A method for manufacturing a transparent display panel includes the steps:

    A first substrate and a second substrate are provided. The first substrate includes a first surface close to the second substrate, a second surface facing away from the second substrate, and at least between the first surface and the second surface. At least one light incident portion at one side portion and configured to receive an incident light beam;

    Forming a liquid crystal assembly located between the first substrate and the second substrate, the liquid crystal assembly having a plurality of pixel units configured to be switchable between a light scattering state and a light transmitting state; and

    A holographic film is formed between the first substrate and the liquid crystal assembly.
18. The method of manufacturing a transparent display panel according to claim 17, wherein the liquid crystal assembly is implemented on the first substrate before the liquid crystal assembly is disposed between the first substrate and the second substrate and combined with the first substrate and the second substrate. A holographic film is made on the first surface.
19. 18. The method for manufacturing a transparent display panel according to claim 17, wherein the step of manufacturing a holographic film on the first surface of the first substrate comprises:

    Coating a photosensitive material layer on the first surface of the first substrate;

    Exposing the photosensitive material layer using a reference beam and an object beam to form an interference pattern in the photosensitive material layer; and

    The holographic film is formed by developing the exposed photosensitive material layer formed with the interference pattern.
20. 19. The method for manufacturing a transparent display panel according to claim 19, wherein the step of exposing the photosensitive material layer using a reference beam and an object beam to form an interference pattern in the photosensitive material layer comprises:

    A mask is used to form a pattern of a plurality of strips separated from each other in the photosensitive material layer while exposing the photosensitive material layer using a reference beam and an object beam.

Images