WO2022067517A1 - 透明显示面板、电子装置以及透明显示面板的制作方法 - Google Patents

透明显示面板、电子装置以及透明显示面板的制作方法 Download PDF

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WO2022067517A1
WO2022067517A1 PCT/CN2020/118872 CN2020118872W WO2022067517A1 WO 2022067517 A1 WO2022067517 A1 WO 2022067517A1 CN 2020118872 W CN2020118872 W CN 2020118872W WO 2022067517 A1 WO2022067517 A1 WO 2022067517A1
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Prior art keywords
guide plate
light guide
light
area
liquid crystal
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PCT/CN2020/118872
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English (en)
French (fr)
Inventor
王龙
贾南方
彭依丹
周健
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京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US17/419,821 priority Critical patent/US11868012B2/en
Priority to CN202080002163.7A priority patent/CN114585963A/zh
Priority to PCT/CN2020/118872 priority patent/WO2022067517A1/zh
Publication of WO2022067517A1 publication Critical patent/WO2022067517A1/zh
Priority to US18/509,374 priority patent/US20240085747A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/13775—Polymer-stabilized liquid crystal layers

Definitions

  • the present disclosure relates to the field of display technology, and in particular, to a transparent display panel, an electronic device and a method for manufacturing the transparent display panel.
  • Transparent display is a widely demanded technology, which can be used in applications such as vehicle display, window display, home display, wearable display, etc. that need to display images and see the scene behind the screen.
  • Transparent display can be achieved by means of a liquid crystal layer formed of a composite of polymer and liquid crystal, such as polymer network stabilized liquid crystal (PSLC) or polymer dispersed liquid crystal (PDLC).
  • PSLC polymer network stabilized liquid crystal
  • PDLC polymer dispersed liquid crystal
  • a voltage will be applied to the display area of the liquid crystal layer to deflect the liquid crystal and scatter light to realize the display function.
  • no voltage is applied on both sides of the liquid crystal layer.
  • Such panels typically include a structure of two substrates and a liquid crystal layer sandwiched between the two substrates.
  • Embodiments of the present disclosure provide a transparent display panel, including:
  • first substrate a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate;
  • the light guide plate is located on the side of the first substrate away from the second substrate, the light guide plate has a light incident surface, and the light incident surface is located on the outer peripheral side of the light guide plate;
  • the light source assembly is arranged to emit light beams toward the light incident surface of the light guide plate;
  • the transparent display panel is provided with a plurality of pixel units, and the plurality of pixel units includes a first pixel unit and a second pixel unit,
  • the distance from the center of the orthographic projection of the first pixel unit on the light exit surface of the light guide plate to the light incident surface of the light guide plate is smaller than the center of the orthographic projection of the second pixel unit on the light exit surface of the light guide plate The distance to the light incident surface of the light guide plate,
  • the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the first pixel unit on the light exit surface of the light guide plate is smaller than that of the effective modulation area of the liquid crystal layer in the second pixel unit on the light exit surface of the light guide plate the area of the orthographic projection.
  • the distance from the center of the orthographic projection of the first pixel unit on the light exit surface of the light guide plate to the light incident surface of the light guide plate is less than a first threshold, and the second pixel unit is located on the light guide plate.
  • the distance from the center of the orthographic projection on the light exit surface of the light guide plate to the light incident surface of the light guide plate is greater than the first threshold value, and the first threshold value is from the surface of the second substrate away from the liquid crystal layer to the light guide plate away from the liquid crystal layer. between 10 and 50 times the distance between the surfaces.
  • the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the first pixel unit on the light exit surface of the light guide plate is the area of the effective modulation area of the liquid crystal layer in the second pixel unit on the light guide plate. 20% to 80% of the area of the orthographic projection on the light exit surface.
  • the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the first pixel unit on the light exit surface of the light guide plate is the area of the effective modulation area of the liquid crystal layer in the second pixel unit on the light guide plate. 40% to 60% of the area of the orthographic projection on the light exit surface.
  • the plurality of pixel units further include a third pixel unit, and the distance from the center of the orthographic projection of the first pixel unit on the light exit surface of the light guide plate to the light incident surface of the light guide plate is less than
  • the first threshold value is greater than the second threshold value
  • the distance from the center of the orthographic projection of the third pixel unit on the light exit surface of the light guide plate to the light incident surface of the light guide plate is less than the second threshold value
  • the third pixel unit The area of the orthographic projection of the effective modulation area of the liquid crystal layer on the light exit surface of the light guide plate is smaller than the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the first pixel unit on the light exit surface of the light guide plate.
  • the plurality of pixel units further include a fourth pixel unit, and the distance from the center of the orthographic projection of the third pixel unit on the light exit surface of the light guide plate to the light incident surface of the light guide plate is less than
  • the second threshold value is greater than the third threshold value
  • the distance from the center of the orthographic projection of the fourth pixel unit on the light exit surface of the light guide plate to the light incident surface of the light guide plate is less than the third threshold value
  • the fourth pixel unit The area of the orthographic projection of the effective modulation area of the liquid crystal layer on the light exit surface of the light guide plate is smaller than the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the third pixel unit on the light exit surface of the light guide plate.
  • the difference between the first threshold and the second threshold is equal to the difference between the second threshold and the third threshold
  • the effective modulation area of the liquid crystal layer in the first pixel unit emits light from the light guide plate
  • the area of the orthographic projection on the surface, the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the third pixel unit on the light exit surface of the light guide plate, and the effective modulation area of the liquid crystal layer in the fourth pixel unit on the light guide plate The area of the orthographic projection on the light exit surface of the light plate decreases sequentially by 5% to 10% of the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the second pixel unit on the light exit surface of the light guide plate.
  • all pixel units whose distance from the center of the orthographic projection on the light exit surface of the light guide plate to the light incident surface of the light guide plate is greater than the first threshold value have an effective modulation area of the liquid crystal layer with the same area.
  • the area of the effective modulation region of the liquid crystal layer of a plurality of pixel units whose distance from the center of the orthographic projection on the light exit surface of the light guide plate to the light incident surface of the light guide plate is less than the first threshold value varies with all The distance from the center of the orthographic projection of the pixel unit on the light exit surface of the light guide plate to the light incident surface of the light guide plate decreases as the distance decreases.
  • the first pixel unit includes a first transparent electrode and a second transparent electrode for modulating the liquid crystal layer
  • the second pixel unit includes a third transparent electrode and a fourth transparent electrode for modulating the liquid crystal layer
  • the effective modulation area of the liquid crystal layer in the first pixel unit is the overlapping area of the orthographic projection of the first transparent electrode on the light exit surface of the light guide plate and the orthographic projection of the second transparent electrode on the light exit surface of the light guide plate
  • the effective modulation area of the liquid crystal layer in the second pixel unit is the overlapping area of the orthographic projection of the third transparent electrode on the light exit surface of the light guide plate and the orthographic projection of the fourth transparent electrode on the light exit surface of the light guide plate.
  • the first transparent electrode and the third transparent electrode are located on a side of the liquid crystal layer facing the light exit surface of the light guide plate, and the second transparent electrode and the fourth transparent electrode are located on the On the side of the liquid crystal layer facing the second substrate, the orthographic projection area of at least one of the first transparent electrode and the second transparent electrode on the light exit surface of the light guide plate is smaller than that of the third transparent electrode and the second transparent electrode. The area of the orthographic projection of at least one of the fourth transparent electrodes on the light exit surface of the light guide plate.
  • the first transparent electrode and the third transparent electrode are located on a side of the liquid crystal layer facing the light exit surface of the light guide plate, and the second transparent electrode and the fourth transparent electrode are located on the On the side of the liquid crystal layer facing the second substrate, one or both of the first transparent electrode and the second transparent electrode form a hollow pattern.
  • the first pixel unit further includes a dummy electrode, the dummy electrode is not electrically connected to the first transparent electrode and the second transparent electrode, and the first transparent electrode or the second transparent electrode is in the
  • the orthographic projection on the light exit surface of the light guide plate has a hollow area, and the orthographic projection of the dummy electrode on the light exit surface of the light guide plate is located in the hollow area.
  • the first pixel unit further includes a dummy electrode, the dummy electrode is not electrically connected to the first transparent electrode and the second transparent electrode, and the first transparent electrode and the second transparent electrode are
  • the orthographic projection of one of the dummy electrodes on the light exit surface of the light guide plate has a hollow area, and the orthographic projection of the dummy electrode on the light exit surface of the light guide plate is located in the hollow area, and is connected with the first transparent electrode and the first transparent electrode.
  • the orthographic projection of the other of the two transparent electrodes on the light exit surface of the light guide plate at least partially overlaps.
  • the area of the orthographic projection of the liquid crystal aggregation region in the first pixel unit on the light exit surface of the light guide plate is smaller than the normal projection area of the liquid crystal polymerization region in the second pixel unit on the light exit surface of the light guide plate shadow area.
  • the area of the orthographic projection of the liquid crystal polymerization region in the first pixel unit on the light exit surface of the light guide plate is the orthographic projection area of the liquid crystal polymerization region in the second pixel unit on the light exit surface of the light guide plate 40% to 60%.
  • the liquid crystal layer comprises polymer network stabilized liquid crystal or polymer dispersed liquid crystal.
  • Embodiments of the present disclosure also provide a method for manufacturing a transparent display panel, including:
  • the light guide plate is located on the side of the first substrate away from the second substrate, the light guide plate has a light incident surface, and the light incident surface is located on the outer peripheral side of the light guide plate;
  • a light source assembly is provided, the light source assembly is arranged to emit light beams toward the light incident surface of the light guide plate;
  • a plurality of pixel units are arranged on the transparent display panel, and the plurality of pixel units include a first pixel unit and a second pixel unit,
  • the distance from the center of the orthographic projection of the first pixel unit on the light exit surface of the light guide plate to the light incident surface of the light guide plate is smaller than the center of the orthographic projection of the second pixel unit on the light exit surface of the light guide plate The distance to the light incident surface of the light guide plate,
  • the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the first pixel unit on the light exit surface of the light guide plate is smaller than that of the effective modulation area of the liquid crystal layer in the second pixel unit on the light exit surface of the light guide plate the area of the orthographic projection.
  • disposing a plurality of pixel units on the transparent display panel includes:
  • first transparent electrode and the second transparent electrode in the first pixel unit are patterned, so that the first transparent electrode in the first pixel unit is on the positive side of the light exit surface of the light guide plate.
  • the overlapping area of the projection and the orthographic projection of the second transparent electrode on the light exit surface of the light guide plate is smaller than the orthographic projection of the first transparent electrode in the second pixel unit on the light exit surface of the light guide plate and the orthographic projection of the second transparent electrode on the light guide plate The overlapping area of the orthographic projections on the light exit surface.
  • disposing a plurality of pixel units on the transparent display panel includes:
  • the liquid crystal layer between the first substrate and the second substrate is irradiated with ultraviolet light by using a mask, and the light-shielding area of the area overlapping the mask and the first pixel unit is smaller than the light-shielding area of the area overlapping the second pixel unit .
  • Embodiments of the present disclosure also provide an electronic device including the transparent display panel according to any of the above embodiments.
  • FIG. 1 is a schematic diagram of a light incident principle of a transparent display panel with a light guide plate according to some embodiments of the present disclosure
  • FIG. 2 is a film layer structure diagram of a transparent display panel according to some embodiments of the present disclosure
  • 3 is a graph showing the relationship between the normalized display brightness of the transparent display panel and the distance from the light source assembly;
  • 4A, 4B, 4C, 4D, 4E, 4F, 4G, 4H, 4I and 4J are schematic diagrams of pixel electrode patterning in a near-light source area on the first substrate;
  • 5A, 5B, 5C, 5D, 5E, 5F, 5G, 5H, 5I, and 5J are schematic diagrams of pixel electrode patterning in a near-light source area on the second substrate;
  • FIG. 6A, FIG. 6B, FIG. 6C and FIG. 6D are schematic diagrams of patterned combinations of pixel electrodes in the near-light source area on the first substrate and the second substrate;
  • 7A, 7B, 7C, and 7D are schematic diagrams for patterning liquid crystal polymerized regions in pixel units in a transparent display panel.
  • FIG. 8 schematically shows a flow chart of a method for fabricating a transparent display panel according to some embodiments of the present disclosure.
  • the expressions “located on the same layer” and “disposed on the same layer” generally mean that the first part and the second part may use the same material and may be formed by the same patterning process.
  • the expressions “located on different layers”, “disposed of different layers” generally mean that the first part and the second part are formed by different patterning processes.
  • FIG. 1 shows a schematic diagram of a transparent display panel 100 .
  • the transparent display panel 100 includes a first substrate 10 and a second substrate 20 and a liquid crystal layer 30 between the first substrate 10 (eg, an array substrate) and the second substrate 20 (eg, a cover plate).
  • a light guide plate 40 is provided on the side of the first substrate 10 facing away from the second substrate 20 .
  • the light guide plate 40 may be adhered to the surface of the first substrate 10 on the side facing away from the second substrate 20 by the optical glue 50 .
  • the side incident method is adopted, that is, the light incident surface 41 of the light guide plate 40 is located on the outer peripheral side of the light guide plate 40 .
  • the outer peripheral side of the light guide plate 40 refers to the side of the light guide plate 40 at the periphery of the light guide plate 40 excluding the light exit surface facing the first substrate 10 and the surface opposite to the light exit surface.
  • the light source assembly 60 can be arranged to emit the light beam 51 toward the light incident surface 41 of the light guide plate 40 . After entering the light guide plate 40 , the light beam 51 is reflected by the light guide plate 40 and then emitted from the light exit surface 42 to the first substrate 10 . At least a part of the light beam 51 passes through the first substrate 10 , the liquid crystal layer 30 and the second substrate 20 to exit, thereby Realize the display function.
  • the light exit surface 42 of the light guide plate 40 is arranged on the side of the light guide plate 40 facing the first substrate 10 .
  • FIG. 3 presents an exemplary graph of the normalized display brightness of the transparent display panel versus the distance from the light source assembly.
  • the abscissas and ordinates in Figure 3 are all normalized values.
  • the abscissa represents the distance from the light source component. The larger the value, the farther from the light source component.
  • the ordinate represents the display brightness, the larger the value, the higher the brightness. It can be clearly seen from FIG. 3 that, in the area near the light source on the transparent display panel, with the increase of the distance from the light source assembly, the display brightness decreases sharply at first, and then tends to be gentle.
  • An area in which the distance from the light source assembly is short and the display brightness changes significantly with increasing distance from the light source assembly may be referred to as a near-light source area. For the area near the light source, the problem of uneven display brightness is easy to occur.
  • the concept of a threshold value will be introduced hereinafter. That is, when the distance between the orthographic projection of a part of the transparent display panel on the light exit surface 42 of the light guide plate 40 and the light incident surface 41 of the light guide plate 40 is less than the threshold, the part is considered to be in the near light source area.
  • Transparent display panels are different from liquid crystal display panels used on conventional liquid crystal displays.
  • the conventional liquid crystal display panel uses electrodes to apply voltage to the liquid crystal layer to change the effect of the liquid crystal layer on the polarization direction of polarized light, and detects the outgoing polarization through an analyzer (usually formed by a polarizer) located on the light exit side of the liquid crystal layer.
  • the state of the light (the polarized light with different polarization directions corresponds to the different transmittance of the analyzer), so as to realize the image display. Therefore, in a conventional liquid crystal display, polarizers (one is a polarizer and the other is an analyzer) on both sides of the liquid crystal layer are essential components.
  • the liquid crystal layer 30 may generate a transmission state and at least one scattering state under the action of a voltage.
  • the liquid crystal layer 30 may allow light to transmit therethrough, and thus, the light may be totally reflected back and forth between the first substrate 10 or the light guide plate and the second substrate 20 after passing through the liquid crystal layer 30 , for example.
  • the liquid crystal layer 30 can scatter the light, thereby changing the traveling direction of the light. In this way, after the light passes through the liquid crystal layer 30 in such a state, a considerable amount of light travels on the second substrate 20 away from the liquid crystal.
  • the surface of the layer 30 (the upper surface in FIGS.
  • the liquid crystal layer 30 may include, for example, a polymer network stabilized liquid crystal. It should be noted that although the embodiment of the present disclosure shown in FIG. 1 shows one light source assembly, the embodiment of the present disclosure is not limited thereto, for example, the transparent display panel 100 may also have two light source assemblies. In the embodiments of the present disclosure, images can be observed from both the upper and lower sides of the transparent liquid crystal display panel.
  • the liquid crystal layer 30 may be in the form of a composite film layer of polymer and liquid crystal, eg, made of polymer network stabilized liquid crystal (PSLC) or polymer dispersed liquid crystal (PDLC) material.
  • PSLC polymer network stabilized liquid crystal
  • PDLC polymer dispersed liquid crystal
  • the polymer network stabilized liquid crystal material is a kind of optoelectronic composite material in which a small amount of polymer forms a network to stabilize the liquid crystal orientation.
  • the refractive index change is caused by the different alignment and orientation of liquid crystal molecules in the polymer network.
  • the polymer network stabilizes the liquid crystal material to show a transparent state (ie, a light transmission state), while after an appropriate electric field is applied, due to the polymer network
  • the anchoring effect between the network and the liquid crystal will limit the reorientation of some liquid crystals in the electric field, make the liquid crystal molecules chaotically arranged, show different refractive indices, and scatter the incident light (that is, the polymer network stabilizes the liquid crystal material in a light scattering state. ).
  • the polymer network stabilizes the above-mentioned properties of the liquid crystal material and can be used for the above-mentioned liquid crystal layer 30 to display images.
  • a liquid crystal assembly based on a polymer network-stabilized liquid crystal material can form a polymer network by irradiating with ultraviolet light after pouring common liquid crystal molecules and polymerizable liquid crystal monomers into a liquid crystal cell. Affected by the polymer network, the response speed of the liquid crystal can reach, for example, within 2 milliseconds.
  • the polymer dispersed liquid crystal (PDLC) material is formed by dispersing liquid crystals in the form of droplets (for example, micrometers) in an organic solid polymer matrix; specifically, the liquid crystal layer 30 in the form of a polymer film layer made of PDLC is, for example, It is prepared by dispersing liquid crystal molecules in the form of droplets in which liquid crystal molecules are randomly arranged in optical axis orientation within an organic solid polymer matrix contained in a liquid crystal layer. Moreover, 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 the dispersion of the polymer when the incident occurs.
  • the optical axis alignment of the liquid crystal droplets can be adjusted to be aligned along the applied electric field under the condition that an electric field has been applied to the polymer dispersed liquid crystal material, then when the refractive index of the liquid crystal molecules matches that of the polymer matrix , resulting in light incident into the polymer-dispersed liquid crystal material being transmitted through its polymer matrix (rather than being scattered by droplets dispersed within the polymer matrix), so that the polymer-dispersed liquid crystal material has no The light exhibits a transparent state (ie, a light-transmitting state).
  • the liquid crystal droplets After removal of the electric field, the liquid crystal droplets return to their original state of scattering light incident into the polymer dispersed liquid crystal material in all directions (in this case, the polymer dispersed liquid crystal material returns to a light scattering state).
  • the above properties of the polymer dispersed liquid crystal material can be exploited to control the light intensity transmitted through the PDLC film layer by changing the voltage across it.
  • FIG. 2 illustrates a film layer structure diagram of the transparent display panel 100 according to some embodiments of the present disclosure.
  • a plurality of pixel units PX are disposed on the transparent display panel 100, and the plurality of pixel units PX include a first pixel unit PX1 and a second pixel unit PX2.
  • the first pixel unit PX1 is located in the above-mentioned near-light source area. For example, the distance d1 from the center of the orthographic projection of the first pixel unit PX1 on the light exit surface 42 of the light guide plate 40 to the light incident surface 41 of the light guide plate 40 is smaller than the first pixel unit PX1. a threshold.
  • the second pixel unit PX2 is located outside the above-mentioned near light source area. For example, the center of the orthographic projection of the second pixel unit PX2 on the light exit surface 42 of the light guide plate 40 to the light incident surface 41 of the light guide plate 40 The distance d2 is greater than the first threshold.
  • the transparent display panel 100 may further include a The first electrode layer 71, the second electrode layer 72 between the second substrate 20 and the liquid crystal layer 30, the first liquid crystal alignment layer 81 between the liquid crystal layer 30 and the first electrode layer 71, and the liquid crystal layer 30 and the first The second liquid crystal alignment layer 82 between the two electrode layers 72 .
  • Both the first electrode layer 71 and the second electrode layer 72 may be made of, for example, a transparent conductive material (eg, indium tin oxide).
  • the light output intensity of the pixel unit PX has an increasing function relationship with the area of the effective modulation area of the liquid crystal layer in the pixel unit PX. That is, the larger the area of the effective modulation region of the liquid crystal layer in the pixel unit PX, the higher the light output intensity of the pixel unit PX. It should be understood that, the transparent liquid crystal display panel adjusts the light output intensity of the display panel by applying a suitable voltage to the first electrode layer 71 and the second electrode layer 72 in the pixel unit PX to modulate the part of the liquid crystal layer located in each pixel unit PX. of.
  • the effective modulation area of the liquid crystal layer in the pixel unit PX refers to an area in which the liquid crystal layer in the pixel unit PX can be actually modulated when a voltage is applied to the first electrode layer 71 and the second electrode layer 72 described above.
  • the size of the effective modulation area of the liquid crystal layer in the pixel unit PX is related to at least two factors.
  • the first is the overlapping area of the first electrode layer 71 and the second electrode layer 72 in the pixel unit PX (more precisely, the first electrode layer 71 and the second electrode layer 72 are in a certain plane (such as the light exit of the light guide plate).
  • the overlapping region of the first electrode layer 71 and the second electrode layer 72 in the pixel unit PX may be the region that actually modulates the liquid crystal molecules.
  • the second is the liquid crystal polymerized region in the liquid crystal layer.
  • both PSLC materials and PDLC materials need to use ultraviolet irradiation to polymerize the liquid crystal to achieve the function of switching between the transmission state and the scattering state.
  • a region of the liquid crystal layer that is irradiated with ultraviolet rays to polymerize the liquid crystal may be referred to as a liquid crystal polymerized region. Only the liquid crystal molecules in the liquid crystal polymerization region can realize the above-mentioned function of switching the transmission state and the scattering state. Therefore, in fact, the overlapping area of the liquid crystal polymerization area, the first electrode layer 71 and the second electrode layer 72 in the liquid crystal layer is the area that actually modulates the liquid crystal molecules, that is, the effective modulation area of the liquid crystal layer.
  • the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the first pixel unit PX1 on the light exit surface 42 of the light guide plate 40 is smaller than the effective modulation area of the liquid crystal layer in the second pixel unit PX2 The area of the orthographic projection on the light exit surface 42 of the light guide plate 40 .
  • the number of liquid crystal molecules modulated in the first pixel unit PX1 will be smaller than the number of liquid crystal molecules modulated in the second pixel unit PX2 , so that the outgoing light intensity in the first pixel unit PX1 is reduced compared to the case where the effective modulation area of the liquid crystal layer is the same as that of the second pixel unit PX2, which is beneficial to make the outgoing light intensity at the position near the light source and the position far away from the light source The difference of the light intensity becomes smaller, thereby improving the uniformity of the brightness of the display panel.
  • the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the first pixel unit PX1 on the light exit surface 42 of the light guide plate 40 is the effective modulation area of the liquid crystal layer in the second pixel unit PX2
  • the area of the orthographic projection on the light exit surface 42 of the light guide plate 40 is 20% to 80%, for example, 40% to 60%.
  • the first threshold may be 10 times to 50 times, preferably 20 to 30 times, for example can be between 1 cm and 3 cm.
  • all pixel units PX whose distance from the center of the orthographic projection on the light exit surface 42 of the light guide plate 40 to the light incident surface 41 of the light guide plate 40 is greater than the first threshold value have a liquid crystal layer with the same area. Modulation area. That is, the adjustment of the effective modulation area of the liquid crystal layer is only performed in the area near the light source. However, the embodiments of the present disclosure are not limited thereto, for example, some adjustments may also be made to the effective modulation area of the liquid crystal layer of different pixel units (eg, the second pixel unit PX2 ) outside the near-light source area.
  • the effective modulation area of the liquid crystal layer can also be further adjusted.
  • the liquid crystal layer of a plurality of pixel units in the near light source area (the distance from the center of their orthographic projection on the light exit surface 42 of the light guide plate 40 to the light entrance surface 41 of the light guide plate 40 is smaller than the first threshold)
  • the area of the effective modulation region decreases as the distance from the center of the orthographic projection of the pixel unit PX on the light exit surface 42 of the light guide plate 40 to the light incident surface 41 of the light guide plate 40 decreases.
  • the brightness also changes significantly with the distance from the light source. Therefore, in some embodiments, in the above-mentioned near-light source area, it is also possible to The effective modulation area of the liquid crystal layer is further designed.
  • the plurality of pixel units PX3 may further include a third pixel unit PX3. As shown in FIG. 2 , the distance d1 from the center of the orthographic projection of the first pixel unit PX1 on the light exit surface 42 of the light guide plate 40 to the light incident surface 41 of the light guide plate 40 is less than the first threshold and greater than the second threshold.
  • the distance d3 from the center of the orthographic projection of the third pixel unit PX3 on the light exit surface 42 of the light guide plate 40 to the light incident surface 41 of the light guide plate 40 is smaller than the second threshold.
  • the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the third pixel unit PX3 on the light exit surface 42 of the light guide plate 40 is smaller than that of the effective modulation area of the liquid crystal layer in the first pixel unit PX1 on the light guide plate 40 .
  • the area of the orthographic projection on the exit surface 42 can further improve the brightness uniformity of the transparent liquid crystal display panel.
  • the effective modulation area of the liquid crystal layer of more pixel units in the near-light source area can also be adjusted depending on its distance from the light source.
  • the plurality of pixel units PX may further include a fourth pixel unit PX4, the center of the orthographic projection of the third pixel unit PX3 on the light exit surface 42 of the light guide plate 40 to the incident light of the light guide plate 40
  • the distance d3 of the surface 42 is less than the second threshold and greater than the third threshold, the distance from the center of the orthographic projection of the fourth pixel unit PX4 on the light exit surface 42 of the light guide plate 40 to the light entrance surface 42 of the light guide plate 40 d4 is smaller than the third threshold.
  • the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the fourth pixel unit PX4 on the light exit surface 42 of the light guide plate 40 is smaller than that of the effective modulation area of the liquid crystal layer in the third pixel unit PX3 on the light guide plate 40 The area of the orthographic projection on the exit surface 42 .
  • the difference between the first threshold and the second threshold is equal to the difference between the second threshold and the third threshold
  • the effective modulation area of the liquid crystal layer in the first pixel unit PX1 is on the light guide plate 40 .
  • the area of the orthographic projection of the effective modulation area of the liquid crystal layer on the light exit surface 42 of the light guide plate 40 decreases sequentially by the orthographic projection area of the effective modulation area of the liquid crystal layer in the second pixel unit PX2 on the light exit surface 42 of the light guide plate 40 . 5% to 10% of the area. This finer adjustment can further improve the brightness uniformity in the near light source area.
  • the above-mentioned numerical values are only exemplary, and specific numerical values can be determined according to actual needs.
  • the overlapping area of the liquid crystal polymerization area, the first electrode layer 71 and the second electrode layer 72 in the liquid crystal layer is the area that actually modulates the liquid crystal molecules, that is, the effective modulation area of the liquid crystal layer.
  • the effective modulation area of the liquid crystal layer can be It is determined by the overlapping area of the two electrodes in the pixel unit.
  • the part of the first electrode layer 71 located in the first pixel unit PX1 is defined as the first transparent electrode 91
  • the part of the second electrode layer 72 located in the first pixel unit PX1 is defined as the second transparent electrode 92
  • the portion of the first electrode layer 71 located in the second pixel unit PX2 is defined as a third transparent electrode 93
  • the portion of the second electrode layer 72 located in the second pixel unit PX2 is defined as a fourth transparent electrode 94 .
  • the first pixel unit PX1 includes a first transparent electrode 91 and a second transparent electrode 92 for modulating the liquid crystal layer 30
  • the second pixel unit PX2 includes a third transparent electrode 93 and a second transparent electrode for modulating the liquid crystal layer 30
  • the fourth transparent electrode 94 .
  • the effective modulation area of the liquid crystal layer in the first pixel unit PX1 may be the orthographic projection of the first transparent electrode 91 on the light exit surface 42 of the light guide plate 40 and the second transparent electrode 92 on the light exit surface 42 of the light guide plate 40 .
  • the overlapping area of the orthographic projection, the effective modulation area of the liquid crystal layer in the second pixel unit PX2 is the orthographic projection of the third transparent electrode 93 on the light exit surface 42 of the light guide plate 40 and the fourth transparent electrode 94 on the light guide plate 40.
  • the overlapping area of the orthographic projection on the light exit surface 42 is the orthographic projection of the third transparent electrode 93 on the light exit surface 42 of the light guide plate 40 and the fourth transparent electrode 94 on the light guide plate 40.
  • the adjustment of the effective modulation area of the liquid crystal layer can be realized by changing the electrode area in the pixel unit PX.
  • the first transparent electrode 91 and the third transparent electrode 93 are located on the side of the liquid crystal layer 30 facing the light exit surface 42 of the light guide plate 40
  • the second transparent electrode 92 and the fourth transparent electrode 94 Located on the side of the liquid crystal layer 30 facing the second substrate 20 , the orthographic projection of at least one of the first transparent electrode 91 and the second transparent electrode 92 on the light exit surface 42 of the light guide plate 40
  • the area is smaller than the orthographic projection area of at least one of the third transparent electrode 93 and the fourth transparent electrode 94 on the light exit surface 42 of the light guide plate 40 .
  • the area of the orthographic projection of the first transparent electrode 91 on the light exit surface 42 of the light guide plate 40 is smaller than the orthographic projection of the third transparent electrode 93 on the light exit surface 42 of the light guide plate 40
  • the area of the orthographic projection of the second transparent electrode 92 on the light exit surface 42 of the light guide plate 40 is smaller than the area of the orthographic projection of the third transparent electrode 93 on the light exit surface 42 of the light guide plate 40;
  • the area of the orthographic projection on the light exit surface 42 of the light guide plate 40 is smaller than the area of the orthographic projection of the fourth transparent electrode 94 on the light exit surface 42 of the light guide plate 40 ;
  • the second transparent electrode 92 is on the light exit surface of the light guide plate 40
  • the area of the orthographic projection on 42 is smaller than the area of the orthographic projection of the fourth transparent electrode 94 on the light exit surface 42 of the light guide plate 40 .
  • the adjustment of the effective modulation area of the liquid crystal layer can be achieved by patterning some electrodes in the pixel unit PX.
  • a hollow pattern may be formed on one or both of the first transparent electrode 91 and the second transparent electrode 92.
  • adjustment of the area of the effective modulation area of the liquid crystal layer in any other pixel unit can also be achieved by patterning other electrodes in the corresponding pixel unit.
  • FIG. 4J shows a schematic diagram of the unpatterned first electrode layer (pixel electrode in this example) in a transparent liquid crystal display panel.
  • Each square in Figure 4J represents a pixel electrode used in one pixel unit.
  • Area A in FIG. 4J represents a near-light source area, and area B represents a non-low-light source area.
  • the pixel electrodes in the A region may be patterned.
  • 4A to 4I respectively illustrate examples of patterning of the pixel electrodes in FIG. 4J .
  • the dark part represents the remaining electrode entity
  • the white part represents the electrode hollow area where the electrode material is removed.
  • FIGS. 4G to 4I also include dummy electrodes 95a, 95b, and 95c.
  • the dummy electrodes 95a, 95b, and 95c can be located in the electrode hollow area, are not electrically connected to the power supply of the liquid crystal display panel, and are not used to modulate the liquid crystal layer. Therefore, the effective modulation area of the liquid crystal layer in the pixel unit is not affected.
  • the purpose of disposing the dummy electrodes 95a, 95b, 95c is to reduce the light transmittance in the hollow area of the electrodes. It should be understood that although a transparent electrode can be used in the transparent liquid crystal display panel, the area where the transparent electrode is located usually still has a decrease in transmittance compared with the hollow area of the transparent electrode. This difference in transmittance may also adversely affect the brightness uniformity of the display panel. After the dummy electrode is arranged in the electrode hollow area, the effect of reducing the effective modulation area of the liquid crystal layer can be achieved, and the above difference in transmittance can be reduced to avoid affecting the brightness uniformity of the display panel.
  • FIG. 5J shows a schematic diagram of the unpatterned second electrode layer (common electrode in this example) in a transparent liquid crystal display panel.
  • the second electrode layer is in the form of a surface electrode, but embodiments of the present disclosure are not limited thereto, for example, the second electrode layer may also have other forms, such as strip electrodes.
  • Area A in FIG. 5J represents a near-light source area, and area B represents a non-low-light source area.
  • the pixel electrodes in the A region may be patterned.
  • 5A to 5I respectively illustrate examples of patterning of the common electrode in FIG. 5J . Among them, the dark part represents the remaining electrode entity, and the white part represents the electrode hollow area where the electrode material is removed. Similar to the above-mentioned FIGS. 4G to 4I , the dummy electrodes 95d , 95e and 95f are also included in FIGS. 5G to 5I .
  • the orthographic projection of the first transparent electrode 91 on the light exit surface 42 of the light guide plate 40 has a hollow area.
  • the hollow area of the first transparent electrode 91 is a square hole in the center; in FIG. 4H , the hollow area of the first transparent electrode 91 is three elongated holes; in FIG. 4I , the hollow area of the first transparent electrode 91 The hollow area is nine small square holes.
  • the orthographic projection of the second transparent electrode 92 on the light exit surface 42 of the light guide plate 40 may also have a hollow area. In FIG.
  • the hollow area of the second transparent electrode 92 is a square hole in the center; in FIG. 5H , the hollow area of the second transparent electrode 92 is two elongated holes; in FIG. 5I , the hollow area of the second transparent electrode 92 The hollow area is nine small square holes.
  • the first pixel unit PX1 may further include a dummy electrode, which is not electrically connected to the first transparent electrode 91 and the second transparent electrode 92 , and the dummy electrode is on the light exit surface 42 of the light guide plate 40 .
  • the orthographic projection of the first transparent electrode 91 or the second transparent electrode 92 is located in the hollow area of the orthographic projection of the first transparent electrode 91 or the second transparent electrode 92 on the light exit surface 42 of the light guide plate 40 .
  • the functions of the virtual electrodes have been clarified above, and will not be repeated here.
  • FIG. 6A illustrates an example in which two electrodes in the same pixel unit are patterned simultaneously.
  • the dark part represents the remaining electrode entity
  • the white part represents the electrode hollow area where the electrode material is removed.
  • the effective modulation area of the liquid crystal layer of the pixel unit is determined by the overlapping area of the solid areas of the two electrodes.
  • the orthographic projection of the electrodes in the second electrode layer 72 (eg, the second transparent electrodes 92 ) on the light exit surface 42 of the light guide plate 40 has a hollow area (a square hole in the middle). shape). In this case, it may also be considered to provide dummy electrodes (similar to the form in FIG.
  • the orthographic projection of the dummy electrode on the light exit surface 42 of the light guide plate 40 may be the same as the orthographic projection of the electrode in the first electrode layer 71 (eg, the first transparent electrode 91 ) on the light exit surface 42 of the light guide plate 40 overlapping.
  • the embodiments of the present disclosure are not limited thereto, for example, the orthographic projection of the dummy electrode on the light exit surface 42 of the light guide plate 40 is located on the light exit surface of the light guide plate 40 by one of the first transparent electrode 91 and the second transparent electrode 92 42 and at least partially overlap with the orthographic projection of the other one of the first transparent electrode 91 and the second transparent electrode 92 on the light exit surface 42 of the light guide plate 40 .
  • the electrodes in the pixel unit are patterned to adjust the area of the effective modulation region of the liquid crystal layer. This method only needs to change the electrode pattern, does not increase the difficulty of the manufacturing process, and is advantageous for the cost.
  • the area of the effective modulation area of the liquid crystal layer can also be adjusted by changing the liquid crystal polymerization area in the pixel unit.
  • the area of the orthographic projection of the liquid crystal aggregation region (in the liquid crystal layer 30 ) in the first pixel unit PX1 on the light exit surface 42 of the light guide plate 40 is smaller than that of the liquid crystal aggregation region in the second pixel unit PX2 The orthographic projection area on the light exit surface 42 of the light guide plate 40 .
  • the area of the orthographic projection of the liquid crystal aggregation area in the first pixel unit PX1 on the light exit surface 42 of the light guide plate 40 is the area of the liquid crystal aggregation area in the second pixel unit PX2 on the light exit surface 42 of the light guide plate 40 . 40% to 60% of the orthographic projected area.
  • FIGS. 7A to 7D show examples of adjusting the liquid crystal polymerization area when the liquid crystal layer is irradiated with ultraviolet light.
  • Area A in FIG. 7D represents a near-light source area
  • area B represents a non-low-light source area.
  • the dark part is the light-shielding part of the mask
  • the hollow part (such as a round hole, a rectangular hole or a square hole) on the mask is a light-transmitting part.
  • These mask patterns have different light-transmitting areas, and can be used to form liquid crystal aggregation areas of different sizes, thereby adjusting the area of the effective modulation area of the liquid crystal layer in the pixel unit.
  • the light-shielding area of the region of the mask 85 overlapping with the first pixel unit PX1 may be smaller than the light-shielding area of the region overlapping with the second pixel unit PX2.
  • the mask can be made of any light-shielding material (such as metal), and does not need to be integrated with the display panel, and can be used repeatedly for different display panels during the manufacturing process of the display panel.
  • the scheme of patterning the electrodes and adjusting the liquid crystal aggregation area may also be used in combination to change the area of the effective modulation area of the liquid crystal layer in the pixel unit.
  • the liquid crystal layer 30 may include, for example, a polymer network stabilized liquid crystal or a polymer dispersed liquid crystal.
  • Embodiments of the present disclosure also provide a method for fabricating a transparent display panel. As shown in Figure 8, the method includes:
  • Step S10 providing a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate;
  • Step S20 providing a light guide plate, the light guide plate is located on the side of the first substrate away from the second substrate, the light guide plate has a light incident surface, and the light incident surface is located on the outer peripheral side of the light guide plate;
  • Step S30 providing a light source assembly, the light source assembly is arranged to emit light beams toward the light incident surface of the light guide plate;
  • Step S40 Arrange a plurality of pixel units on the transparent display panel, the plurality of pixel units include a first pixel unit and a second pixel unit, and the orthographic projection of the first pixel unit on the light exit surface of the light guide plate
  • the distance from the center of the light guide plate to the light incident surface of the light guide plate is smaller than the distance from the center of the orthographic projection of the second pixel unit on the light exit surface of the light guide plate to the light incident surface of the light guide plate, wherein the first The area of the orthographic projection of the effective modulation area of the liquid crystal layer in one pixel unit on the light exit surface of the light guide plate is smaller than the area of the orthographic projection of the effective modulation area of the liquid crystal layer in the second pixel unit on the light exit surface of the light guide plate .
  • the effective modulation area of the liquid crystal layer in the pixel unit can be adjusted to improve the brightness uniformity of the transparent display panel.
  • the distance from the center of the orthographic projection of the first pixel unit PX1 on the light exit surface 42 of the light guide plate 40 to the light incident surface 41 of the light guide plate 40 is smaller than the first threshold, and the second pixel unit PX2
  • the distance from the center of the orthographic projection on the light exit surface 42 of the light guide plate 40 to the light incident surface 41 of the light guide plate 40 is greater than a first threshold, which is when the second substrate 20 is far from the liquid crystal layer 30
  • the distance between the surface of the light guide plate 40 and the surface of the light guide plate 40 facing away from the liquid crystal layer 30 is between 10 times and 50 times the distance.
  • the above step S40 may further include:
  • first transparent electrode and the second transparent electrode in the first pixel unit are patterned, so that the first transparent electrode in the first pixel unit is on the positive side of the light exit surface of the light guide plate.
  • the overlapping area of the projection and the orthographic projection of the second transparent electrode on the light exit surface of the light guide plate is smaller than the orthographic projection of the first transparent electrode in the second pixel unit on the light exit surface of the light guide plate and the orthographic projection of the second transparent electrode on the light guide plate The overlapping area of the orthographic projections on the light exit surface.
  • step S40 may further include:
  • the liquid crystal layer between the first substrate and the second substrate is irradiated with ultraviolet light by using a mask, and the light-shielding area of the area overlapping the mask and the first pixel unit is smaller than the light-shielding area of the area overlapping the second pixel unit .
  • Embodiments of the present disclosure also provide an electronic device, including the transparent display panel described in any of the above embodiments.
  • the electronic device can be any device with a transparent display function, such as billboards, windows, digital photo frames, and the like.

Abstract

本公开的实施例提供一种透明显示面板，包括：第一基板、第二基板以及液晶层；导光板，具有位于所述导光板的外周侧的入光面；光源组件，布置成朝向所述导光板的入光面发出光束；透明显示面板上设置有多个像素单元，所述多个像素单元包括第一像素单元和第二像素单元，第一像素单元在导光板的光出射面上的正投影的中心至导光板的入光面的距离小于第二像素单元在导光板的光出射面上的正投影的中心至导光板的入光面的距离，其中，第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积小于第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积。

Description

透明显示面板、电子装置以及透明显示面板的制作方法 技术领域
本公开涉及显示技术领域，尤其涉及一种透明显示面板、一种电子装置以及一种透明显示面板的制作方法。
背景技术
透明显示是一种需求很广的技术，可以用于车载显示、窗户显示、家居显示、穿戴显示等方面等既需要显示图像，又需要看到屏幕后方景物的应用。透明显示可以借助于由聚合物与液晶的复合物形成的液晶层(例如聚合物网络稳定液晶(PSLC)或聚合物分散液晶(PDLC))来实现。当该透明显示屏需要显示时，液晶层的显示区域会施加电压，使液晶发生偏转，散射出光，实现显示功能。当该屏幕不需要显示时，液晶层两侧不施加电压。这种面板通常包括两块基板和夹在两块基板之间的液晶层的结构。
公开内容
本公开的实施例提供一种透明显示面板，包括：
第一基板、第二基板以及位于所述第一基板和第二基板之间的液晶层；
导光板，所述导光板位于所述第一基板的背离第二基板的一侧，所述导光板具有入光面，所述入光面位于所述导光板的外周侧；
光源组件，所述光源组件布置成朝向所述导光板的入光面发出光束；
所述透明显示面板上设置有多个像素单元，所述多个像素单元包括第一像素单元和第二像素单元，
所述第一像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于所述第二像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离，
其中，所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积小于所述第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积。
在一些实施例中，所述第一像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第一阈值，所述第二像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离大于第一阈值，所述第一阈值在第二基板的远离所述液晶层的表面至导光板的背离液晶层的表面之间的距离的10倍至50倍之间。
在一些实施例中，所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积为所述第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积的20％至80％。
在一些实施例中，所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积为所述第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积的40％至60％。
在一些实施例中，所述多个像素单元还包括第三像素单元，所述第一像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第一阈值且大于第二阈值，所述第三像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第二阈值，所述第三像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积小于所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积。
在一些实施例中，所述多个像素单元还包括第四像素单元，所述第三像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第二阈值且大于第三阈值，所述第四像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第三阈值，所述第四像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积小于所述第三像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积。
在一些实施例中，所述第一阈值和第二阈值之差与所述第二阈值和第三阈值之差相等，所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积、所述第三像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积和所述第四像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积依次递减所述第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积的5％至10％。
在一些实施例中，在导光板的光出射面上的正投影的中心至所述导光板的入 光面的距离大于第一阈值的所有像素单元具有面积相等的液晶层有效调制区域。
在一些实施例中，在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第一阈值的多个像素单元的液晶层有效调制区域的面积随着所述像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离的减小而减小。
在一些实施例中，所述第一像素单元包括用于调制液晶层的第一透明电极和第二透明电极，所述第二像素单元包括用于调制液晶层的第三透明电极和第四透明电极，第一像素单元中的液晶层有效调制区域为所述第一透明电极在导光板的光出射面上的正投影和第二透明电极在导光板的光出射面上的正投影的重叠区域，第二像素单元中的液晶层有效调制区域为所述第三透明电极在导光板的光出射面上的正投影和第四透明电极在导光板的光出射面上的正投影的重叠区域。
在一些实施例中，所述第一透明电极和第三透明电极位于所述液晶层的朝向所述导光板的光出射面的一侧，所述第二透明电极和第四透明电极位于所述液晶层的朝向所述第二基板的一侧，所述第一透明电极和第二透明电极中的至少一者在导光板的光出射面上的正投影的面积小于所述第三透明电极和第四透明电极中的至少一者在导光板的光出射面上的正投影的面积。
在一些实施例中，所述第一透明电极和第三透明电极位于所述液晶层的朝向所述导光板的光出射面的一侧，所述第二透明电极和第四透明电极位于所述液晶层的朝向所述第二基板的一侧，所述第一透明电极和第二透明电极中的一者或两者形成镂空图案。
在一些实施例中，所述第一像素单元还包括虚拟电极，所述虚拟电极与所述第一透明电极和第二透明电极均不电连接，所述第一透明电极或第二透明电极在导光板的光出射面上的正投影具有镂空区，所述虚拟电极在导光板的光出射面上的正投影位于所述镂空区中。
在一些实施例中，所述第一像素单元还包括虚拟电极，所述虚拟电极与所述第一透明电极和第二透明电极均不电连接，所述第一透明电极和第二透明电极中的一者在导光板的光出射面上的正投影具有镂空区，所述虚拟电极在导光板的光出射面上的正投影位于所述镂空区中，并与所述第一透明电极和第二透明电极中的另一者在导光板的光出射面上的正投影至少部分地重叠。
在一些实施例中，所述第一像素单元中的液晶聚合区域在导光板的光出射面 上的正投影的面积小于第二像素单元中的液晶聚合区域在导光板的光出射面上的正投影面积。
在一些实施例中，第一像素单元中的液晶聚合区域在导光板的光出射面上的正投影的面积是第二像素单元中的液晶聚合区域在导光板的光出射面上的正投影面积的40％至60％。
在一些实施例中，所述液晶层包括聚合物网络稳定液晶或聚合物分散液晶。
本公开的实施例还提供了一种透明显示面板的制作方法，包括：
提供第一基板、第二基板以及位于所述第一基板和第二基板之间的液晶层；
提供导光板，所述导光板位于所述第一基板的背离第二基板的一侧，所述导光板具有入光面，所述入光面位于所述导光板的外周侧；
提供光源组件，所述光源组件布置成朝向所述导光板的入光面发出光束；
在所述透明显示面板上设置多个像素单元，所述多个像素单元包括第一像素单元和第二像素单元，
所述第一像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于所述第二像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离，
其中，所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积小于所述第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积。
在一些实施例中，在所述透明显示面板上设置多个像素单元包括：
对所述第一像素单元中的第一透明电极和第二透明电极中的一者或两者进行图案化，使得第一像素单元中的第一透明电极在导光板的光出射面上的正投影与第二透明电极在导光板的光出射面上的正投影的重叠面积小于第二像素单元中的第一透明电极在导光板的光出射面上的正投影与第二透明电极在导光板的光出射面上的正投影的重叠面积。
在一些实施例中，在所述透明显示面板上设置多个像素单元包括：
使用掩膜板对第一基板和第二基板之间的液晶层进行紫外光照射，所述掩膜板与第一像素单元重合的区域的遮光面积小于与第二像素单元重合的区域的遮光面积。
本公开的实施例还提供了一种电子装置，包括根据上述任一实施例所述的透 明显示面板。
附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描述，本公开的其它特征、目的和优点将会变得更明显：
图1为根据本公开的一些实施例的具有导光板的透明显示面板的光入射原理示意图；
图2为根据本公开的一些实施例的透明显示面板的膜层结构图；
图3为透明显示面板的归一化的显示亮度与离开光源组件的距离的关系图；
图4A、图4B、图4C、图4D、图4E、图4F、图4G、图4H、图4I和图4J为第一基板上的近光源区域中的像素电极图案化示意图；
图5A、图5B、图5C、图5D、图5E、图5F、图5G、图5H、图5I和图5J为第二基板上的近光源区域中的像素电极图案化示意图；
图6A、图6B、图6C和图6D为第一基板和第二基板上的近光源区域中的像素电极图案化组合的示意图；
图7A、图7B、图7C和图7D为用于对透明显示面板中的像素单元中的液晶聚合区域进行图案化的示意图；以及
图8示意性地示出了根据本公开的一些实施例的一种透明显示面板的制作方法的流程图。
具体实施方式
下面结合附图和实施例对本公开作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释相关发明，而非对该发明的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与发明相关的部分。
需要说明的是，在不冲突的情况下，本公开中的实施例及实施例中的特征可以相互组合。
另外，在下面的详细描述中，为便于解释，阐述了许多具体的细节以提供对本披露实施例的全面理解。然而明显地，一个或多个实施例在没有这些具体细节的情况下也可以被实施。
应该理解的是，尽管在这里可使用术语第一、第二等来描述不同的元件，但是这些元件不应受这些术语的限制。这些术语仅是用来将一个元件与另一个元件区分开来。例如，在不脱离示例实施例的范围的情况下，第一元件可以被命名为第二元件，类似地，第二元件可以被命名为第一元件。如在这里使用的术语“和/或”包括一个或多个相关所列的项目的任意组合和所有组合。
应该理解的是，当元件或层被称作“形成在”另一元件或层“上”时，该元件或层可以直接地或间接地形成在另一元件或层上。也就是，例如，可以存在中间元件或中间层。相反，当元件或层被称作“直接形成在”另一元件或层“上”时，不存在中间元件或中间层。应当以类似的方式来解释其它用于描述元件或层之间的关系的词语(例如，“在...之间”与“直接在...之间”、“相邻的”与“直接相邻的”等)。
本文中使用的术语仅是为了描述特定实施例的目的，而不意图限制实施例。如本文中所使用的，除非上下文另外明确指出，否则单数形式也意图包括复数形式。还将理解的是，当在此使用术语“包含”和/或“包括”时，说明存在所述特征、整体、步骤、操作、元件和/或组件，但不排除存在或附加一个或多个其它特征、整体、步骤、操作、元件、组件和/或它们的组合。
在本文中，如无特别说明，表述“位于同一层”、“同层设置”一般表示的是：第一部件和第二部件可以使用相同的材料并且可以通过同一构图工艺形成。表述“位于不同层”、“不同层设置”一般表示的是：第一部件和第二部件通过不同构图工艺形成。
图1示出了一种透明显示面板100的示意图。该透明显示面板100包括第一基板10和第二基板20以及位于所述第一基板10(例如阵列基板)和第二基板20(例如盖板)之间的液晶层30。在第一基板10的背离第二基板20的一侧设置导光板40。例如，导光板40可以通过光学胶50粘合到第一基板10的背离第二基板20的一侧的表面上。在该实施例中，采用的是侧入射方式，即导光板40的入光面41位于导光板40的外周侧。导光板40的外周侧指的是导光板40除去与第一基板10正对的出光表面和与该出光表面相反的表面之外的、位于导光板40周边的侧面。光源组件60可设置成朝向所述导光板40的入光面41发出光束51。光束51在进入导光板40之后，被导光板40反射后从光出射面42射向第一基板10，光束51的至少一部分穿过第一基板10、液晶层30和第二基板20出射，从而实现显示功能。导光板40的光出射面42布设于所述导光板40的面对第一基 板10的一侧。
需要说明的是，由于透明显示面板100中的各个膜层不可避免地会吸收光束的能量，因此，光束51在透明显示面板100中传播时随着离开光源组件50的距离越来越远可能会被明显地衰减，从而使透明显示面板100的出光亮度呈现不均匀的问题。导光板40的设置可以明显缓解这种亮度不均的问题，特别是对于远离光源组件的区域的显示亮度均匀性具有显著的改善效果。然而，在靠近光源组件的位置处，显示亮度仍然明显地高于远离光源组件的位置处。图3给出了透明显示面板的归一化的显示亮度与离开光源组件的距离的一种示例性的关系图。图3的横纵坐标均为归一化数值。横坐标表示与光源组件的距离，数值越大，距离光源组件越远。纵坐标表示显示亮度，数值越大，亮度越高。从图3中可以清晰地看出，在透明显示面板上的近光源区域中，随着与光源组件的距离的增大，显示亮度起初具有急剧的下降，而后趋于平缓。在与光源组件的距离较近且显示亮度随着与光源组件的距离增加而变化显著的区域，可被称为近光源区域。对于近光源区域，容易产生显示亮度不均匀的问题。
下面我们将要讨论如何改善透明显示面板上的近光源区域中的显示亮度不均匀的问题。为了便于对上述近光源区域进行界定，在下文中将引入阈值的概念。即当透明显示面板上的某个部分在导光板40的光出射面42上的正投影与导光板40的入光面41的距离小于该阈值，则认为该部分处于近光源区域中。
透明显示面板与常规的液晶显示器上所使用的液晶显示面板是不同的。常规的液晶显示面板是利用电极对液晶层施加电压以改变液晶层对于偏振光的偏振方向的影响，并通过位于液晶层的出光侧的检偏器(通常由偏振片形成)来检测出射的偏振光的状态(偏振方向不同的偏振光对应于检偏器的不同的透射率)，从而实现图像显示的。因此，在常规的液晶显示器中，液晶层两侧的偏振片(一个是起偏器，一个是检偏器)是必不可少的部件。
而在根据本公开的透明显示面板100中，液晶层30在电压的作用下可以产生透射状态和至少一种散射状态。在透射状态下，液晶层30可以允许光透射通过，于是，光在经过液晶层30之后例如可以在第一基板10或导光板和第二基板20之间往复地全反射。而在散射状态下，液晶层30可以对光产生散射作用，从而改变光的行进方向，这样，在光经过处于这样的状态的液晶层30之后，相当数量的光在第二基板20的背离液晶层30的表面(在图1和图2中是上表面)和 导光板40的背离液晶层30的表面(在图1和图2中是下表面)处不再满足全反射条件，从而可以从透明显示面板射出。液晶层30例如可以包括聚合物网络稳定液晶。需要说明的是，虽然图1中所示的本公开的实施例中示出了一个光源组件，但是，本公开的实施例不限于此，例如，透明显示面板100也可以具有两个光源组件。在本公开的实施例中，从透明液晶显示面板的上下两侧均可以观察到图像。
在一些实施例中，液晶层30可以为聚合物与液晶的复合膜层的形式，例如由聚合物网络稳定液晶(PSLC)或聚合物分散液晶(PDLC)材料制成。聚合物网络稳定液晶材料是少量聚合物形成网络以稳定液晶取向的一种光电复合材料。由于液晶分子在聚合物网络中的排列取向不同而引起折射率变化，在未施加电场时，聚合物网络稳定液晶材料呈现透明态(即光透射状态)，而在施加适当电场后，由于聚合物网络与液晶间的锚定作用，将限制部分液晶在电场中的重新取向，使液晶分子杂乱排列，表现出不同的折射率，对入射光进行散射(即聚合物网络稳定液晶材料处于光散射状态)。聚合物网络稳定液晶材料的上述特性，可以用于上述液晶层30来显示图像。
作为示例，基于聚合物网络稳定液晶材料的液晶组件可以通过在液晶盒中灌入普通的液晶分子和可聚合的液晶单体之后，通过紫外光照射形成聚合物网络。受到聚合物网络的影响，液晶响应速度例如可达到2毫秒以内。
聚合物分散液晶(PDLC)材料是液晶以微滴(例如微米量级)形式分散在有机固态聚合物基体内所形成的；具体地，PDLC制成的呈聚合膜层形式的液晶层30例如是通过其中液晶分子以光轴取向杂乱排列的微滴形式而分散在容纳于液晶层中的有机固态聚合物基体内而制备的。并且，由于在未施加电场时，由液晶分子构成的微滴的各自光轴处于自由取向或随机取向，则液晶分子的折射率与聚合物基体的折射率不匹配，导致当入射到聚合物分散液晶材料内的光通过其聚合物基体时被分散于聚合物基体内的微滴沿着各个方向散射，因而聚合物分散液晶材料对于入射到其中的光呈不透明的状态或半透明状态(即光散射状态)。而在已对所述聚合物分散液晶材料施加电场的情况下液晶微滴的光轴取向可被调节成沿着所施加电场取向，则当液晶分子的折射率与聚合物基体的折射率相匹配时，导致当入射到聚合物分散液晶材料内的光通过其聚合物基体时透射通过其中(而非被分散于聚合物基体内的微滴散射)，因而聚合物分散液晶材料对于入射 到其中的光呈现透明态(即光透射状态)。在移除电场之后，液晶微滴又恢复最初的将入射到聚合物分散液晶材料内的光向各个方向散射的状态(此种情况下，聚合物分散液晶材料恢复到处于光散射状态)。聚合物分散液晶材料的上述特性，可以被利用以通过改变其上的电压来控制透过PDLC膜层的光强。
图2示出了根据本公开的一些实施例的透明显示面板100的膜层结构图。在透明显示面板100上设置有多个像素单元PX，所述多个像素单元PX包括第一像素单元PX1和第二像素单元PX2。第一像素单元PX1位于上述近光源区域中，例如，第一像素单元PX1在导光板40的光出射面42上的正投影的中心至所述导光板40的入光面41的距离d1小于第一阈值。所述第二像素单元PX2位于上述近光源区域之外，例如，所述第二像素单元PX2在导光板40的光出射面42上的正投影的中心至所述导光板40的入光面41的距离d2大于第一阈值。
如图2所示，除去上述的第一基板10、第二基板20、液晶层30和导光板40等结构之外，透明显示面板100还可包括位于第一基板10和液晶层30之间的第一电极层71、位于第二基板20和液晶层30之间的第二电极层72、位于液晶层30和第一电极层71之间的第一液晶取向层81以及位于液晶层30和第二电极层72之间的第二液晶取向层82。第一电极层71和第二电极层72例如均可以由透明导电材料制成(例如氧化锡铟)。
在根据本公开的实施例的透明液晶显示面板中，像素单元PX的光出射强度与像素单元PX中的液晶层有效调制区域的面积成增函数关系。即，像素单元PX中的液晶层有效调制区域的面积越大，像素单元PX的光出射强度越高。应当理解，透明液晶显示面板是通过在像素单元PX中的上述第一电极层71和第二电极层72施加合适的电压来调制液晶层位于各个像素单元PX中的部分从而调整显示面板的出光强度的。
像素单元PX中的液晶层有效调制区域指的是当上述第一电极层71和第二电极层72被施加电压时，像素单元PX中的液晶层能够被实际调制的区域。像素单元PX中的液晶层有效调制区域的大小至少与两个因素有关。第一是像素单元PX中第一电极层71和第二电极层72的交叠面积(更准确地说是第一电极层71和第二电极层72在某个平面(例如导光板的光出射面)上的正投影的交叠的面积)。像素单元PX中第一电极层71和第二电极层72相交叠的区域才可能是真正对液晶分子起调制作用的区域。第二是液晶层中的液晶聚合区域。如前所述，不论是 PSLC材料还是PDLC材料，都需要利用紫外线照射来使液晶聚合从而实现在透射态和散射态切换的功能。液晶层中经过紫外线照射以使液晶聚合的区域可称为液晶聚合区域。只有在液晶聚合区域中的液晶分子才能实现上述透射态和散射态切换的功能。因此，实际上液晶层中的液晶聚合区域、第一电极层71和第二电极层72三者相交叠的区域才是真正对液晶分子起调制作用的区域，即液晶层有效调制区域。
在一些实施例中，所述第一像素单元PX1中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积小于所述第二像素单元PX2中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积。这样，当上述第一电极层71和第二电极层72被施加电压时，在第一像素单元PX1中受到调制的液晶分子的数量会小于在第二像素单元PX2中受到调制的液晶分子的数量，从而使得第一像素单元PX1中的出射光强相比于液晶层有效调制区域与第二像素单元PX2相同的情况被减小，这样就有利于使得近光源位置的出射光强与远离光源位置的光强的差别变小，从而提高显示面板的亮度的均一性。
在一些实施例中，所述第一像素单元PX1中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积为所述第二像素单元PX2中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积的20％至80％，例如40％至60％。作为示例，第一阈值可以是第二基板20的远离所述液晶层30的表面至导光板40的背离液晶层30的表面之间的距离(如图2上的ds所示)的10倍至50倍，优选20至30倍，例如可以在1cm至3cm之间。
在一些实施例中，在导光板40的光出射面42上的正投影的中心至所述导光板40的入光面41的距离大于第一阈值的所有像素单元PX具有面积相等的液晶层有效调制区域。即对液晶层有效调制区域的调整只在近光源区域中进行。然而，本公开的实施例不限于此，例如，也可以对于在近光源区域之外的不同的像素单元(例如第二像素单元PX2)的液晶层有效调制区域进行一些调整。
在一些实施例中，对于在近光源区域中的多个像素单元PX，也可以将它们的液晶层有效调制区域进行进一步的调整。例如，在近光源区域中的多个像素单元(它们在导光板40的光出射面42上的正投影的中心至所述导光板40的入光面41的距离小于第一阈值)的液晶层有效调制区域的面积随着所述像素单元PX在导光板40的光出射面42上的正投影的中心至所述导光板40的入光面41的距 离的减小而减小。
从图3中可以看出，在上述近光源区域内，随着与光源距离的不同，亮度也是有明显变化的，因此，在一些实施例中，在上述近光源区域内部还可以对像素单元中的液晶层有效调制区域进行进一步的设计。例如，所述多个像素单元PX3还可以包括第三像素单元PX3。如图2所示，所述第一像素单元PX1在导光板40的光出射面42上的正投影的中心至所述导光板40的入光面41的距离d1小于第一阈值且大于第二阈值。所述第三像素单元PX3在导光板40的光出射面42上的正投影的中心至所述导光板40的入光面41的距离d3小于第二阈值。所述第三像素单元PX3中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积小于所述第一像素单元PX1中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积。这样的设计可以进一步改善透明液晶显示面板的亮度均一性。
还可对近光源区域中更多的像素单元的液晶层有效调制区域进行依赖于其与光源的距离的调整。作为示例，所述多个像素单元PX还可以包括第四像素单元PX4，所述第三像素单元PX3在导光板40的光出射面42上的正投影的中心至所述导光板40的入光面42的距离d3小于第二阈值且大于第三阈值，所述第四像素单元PX4在导光板40的光出射面42上的正投影的中心至所述导光板40的入光面42的距离d4小于第三阈值。所述第四像素单元PX4中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积小于所述第三像素单元PX3中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积。
在一些实施例中，所述第一阈值和第二阈值之差与所述第二阈值和第三阈值之差相等，所述第一像素单元PX1中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积、所述第三像素单元PX3中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积和所述第四像素单元PX4中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积依次递减所述第二像素单元PX2中的液晶层有效调制区域在导光板40的光出射面42上的正投影的面积的5％至10％。这种更加精细的调整可以进一步提高近光源区域中的亮度均一性。上述数值仅仅是示例性的，在实际中可以根据需要来确定具体的数值。
如前所述，液晶层中的液晶聚合区域、第一电极层71和第二电极层72三者相交叠的区域才是真正对液晶分子起调制作用的区域，即液晶层有效调制区域。 然而，当液晶层中的液晶聚合区域为均匀布设(例如在制作过程中，各个像素单元PX所对应的液晶层部分均被紫外光进行照射处理成液晶聚合区域)，则液晶层有效调制区域可以由像素单元中的两个电极的重叠面积来决定。
为了描述方便，在此将第一电极层71位于第一像素单元PX1中的部分定义成第一透明电极91，将第二电极层72位于第一像素单元PX1中的部分定义成第二透明电极92，将第一电极层71位于第二像素单元PX2中的部分定义成第三透明电极93，将第二电极层72位于第二像素单元PX2中的部分定义成第四透明电极94。作为示例，所述第一像素单元PX1包括用于调制液晶层30的第一透明电极91和第二透明电极92，所述第二像素单元PX2包括用于调制液晶层的第三透明电极93和第四透明电极94。第一像素单元PX1中的液晶层有效调制区域可以为所述第一透明电极91在导光板40的光出射面42上的正投影和第二透明电极92在导光板40的光出射面42上的正投影的重叠区域，第二像素单元PX2中的液晶层有效调制区域为所述第三透明电极93在导光板40的光出射面42上的正投影和第四透明电极94在导光板40的光出射面42上的正投影的重叠区域。
利用这种思路，可以通过对于像素单元PX中的电极面积的改变来实现对于液晶层有效调制区域的调整。例如，所述第一透明电极91和第三透明电极93位于所述液晶层30的朝向所述导光板40的光出射面42的一侧，所述第二透明电极92和第四透明电极94位于所述液晶层30的朝向所述第二基板20的一侧，所述第一透明电极91和第二透明电极92中的至少一者在导光板40的光出射面42上的正投影的面积小于所述第三透明电极93和第四透明电极94中的至少一者在导光板40的光出射面42上的正投影的面积。具体地，这里可以包括四种情况，即第一透明电极91在导光板40的光出射面42上的正投影的面积小于第三透明电极93在导光板40的光出射面42上的正投影的面积；第二透明电极92在导光板40的光出射面42上的正投影的面积小于第三透明电极93在导光板40的光出射面42上的正投影的面积；第一透明电极91在导光板40的光出射面42上的正投影的面积小于第四透明电极94在导光板40的光出射面42上的正投影的面积；第二透明电极92在导光板40的光出射面42上的正投影的面积小于第四透明电极94在导光板40的光出射面42上的正投影的面积。
具体地，可以通过对像素单元PX中的某些电极进行图案化来实现对于液晶层有效调制区域的调整。例如，当需要减小第一像素单元PX1中的液晶层有效调 制区域的面积时，可以在所述第一透明电极91和第二透明电极92中的一者或两者形成镂空图案。类似地，对任何其他像素单元中的液晶层有效调制区域的面积的调整也可以通过对相应的像素单元中的其他电极的图案化来实现。
图4J示出了透明液晶显示面板中未进行图案化的第一电极层(在此示例中为像素电极)的示意图。图4J中的每个方块表示用于一个像素单元中的像素电极。图4J中的A区域表示近光源区域，B区域表示非近光源区域。在一些实施例中，可以对A区域中的像素电极进行图案化。图4A至图4I分别示出了图4J中的像素电极进行图案化的示例。其中，深色的部分表示保留的电极实体，白色的部分表示电极材料被移除的电极镂空区。需要说明的是，图4G至图4I中还包含了虚拟电极95a、95b、95c。虚拟电极95a、95b、95c可位于电极镂空区中，与液晶显示面板的电源没有电连接，不用于对液晶层进行调制，因此，不影响像素单元中的液晶层有效调制区域。设置虚拟电极95a、95b、95c是为了减小电极镂空区中的光透射率。应当理解，虽然透明液晶显示面板中可以采用透明电极，但是透明电极的实体所在区域与透明电极的镂空区相比通常还是会有透射率的下降。这种透射率的差异也可能会对显示面板的亮度均一性产生不利的影响。而在电极镂空区中设置虚拟电极之后，既可以实现降低液晶层有效调制区域的作用，又可以减小上述透射率的差异以避免影响显示面板的亮度均一性。
图5J示出了透明液晶显示面板中未进行图案化的第二电极层(在此示例中为公共电极)的示意图。在该示例中，第二电极层为面电极的形式，但本公开的实施例不限于此，例如第二电极层也可以具有其他形式，如条状电极等。图5J中的A区域表示近光源区域，B区域表示非近光源区域。在一些实施例中，可以对A区域中的像素电极进行图案化。图5A至图5I分别示出了图5J中的公共电极进行图案化的示例。其中，深色的部分表示保留的电极实体，白色的部分表示电极材料被移除的电极镂空区。与上述图4G至图4I类似，图5G至图5I中也包含了虚拟电极95d、95e、95f。
在一些实施例中，如图4G至图4I所示，所述第一透明电极91在导光板40的光出射面42上的正投影具有镂空区。在图4G中，第一透明电极91的镂空区为中心的方孔；在图4H中，第一透明电极91的镂空区为三个长条孔；在图4I中，第一透明电极91的镂空区为九个小型的方孔。相应地，如图5G至图5I所示，所述第二透明电极92在导光板40的光出射面42上的正投影也可具有镂空 区。在图5G中，第二透明电极92的镂空区为中心的方孔；在图5H中，第二透明电极92的镂空区为两个长条孔；在图5I中，第二透明电极92的镂空区为九个小型的方孔。所述第一像素单元PX1还可包括虚拟电极，所述虚拟电极与所述第一透明电极91和第二透明电极92均不电连接，所述虚拟电极在导光板40的光出射面42上的正投影位于第一透明电极91或第二透明电极92在导光板40的光出射面42上的正投影的镂空区中。虚拟电极的作用在上述已经阐明，在此不再赘述。
图6A、图6B、图6C和图6D示出了同一像素单元中两个电极同时进行图案化的示例。其中，深色的部分表示保留的电极实体，白色的部分表示电极材料被移除的电极镂空区。在此情况下，该像素单元的液晶层有效调制区域由两个电极的实体区域的重叠面积来决定。在另一些实施例中，例如图6A所示，第二电极层72中的电极(例如第二透明电极92)在导光板40的光出射面42上的正投影具有镂空区(中间的方孔形状)。在这种情况下，也可以考虑在该镂空区中设置虚拟电极(类似于图5G的形式)。此时，该虚拟电极在导光板40的光出射面42上的正投影可以与第一电极层71中的电极(例如第一透明电极91)在导光板40的光出射面42上的正投影重叠。本公开的实施例不限于此，例如，虚拟电极在导光板40的光出射面42上的正投影位于第一透明电极91和第二透明电极92中的一者在导光板40的光出射面42上的正投影的镂空区中，并与所述第一透明电极91和第二透明电极92中的另一者在导光板40的光出射面42上的正投影至少部分地重叠。
在上述实施例中，采用对于像素单元中的电极进行图案化来调整液晶层有效调制区域的面积。这种方式只需要改变电极图案，不会增加制作工艺的难度，对于成本是有利的。
另一方面，如前所述，还可以通过改变像素单元中的液晶聚合区域来调整液晶层有效调制区域的面积。在一些实施例中，所述第一像素单元PX1中的(液晶层30中)液晶聚合区域在导光板40的光出射面42上的正投影的面积小于第二像素单元PX2中的液晶聚合区域在导光板40的光出射面42上的正投影面积。作为示例，第一像素单元PX1中的液晶聚合区域在导光板40的光出射面42上的正投影的面积是第二像素单元PX2中的液晶聚合区域在导光板40的光出射面42上的正投影面积的40％至60％。与此类似，也可以对除去第一像素单元PX1之 外的其他像素单元的液晶聚合区域进行调整。
图7A至图7D给出了在用紫外光照射液晶层时调整液晶聚合区域的示例。图7D中的A区域表示近光源区域，B区域表示非近光源区域。在用紫外光照射液晶层时通过在区域A上施加掩膜板85，可以使得区域A中的像素单元中的液晶聚合区域变小。液晶层30中被掩膜板85遮挡而没有被紫外光照射的部分中的液晶分子将不会聚合。液晶聚合区域由掩膜板的透光部分来确定。图7A至图7C给出了三种掩膜板图案的形式。图7A至图7D中，深色的部分为掩膜板的遮光部分，掩膜板上的镂空部分(比如圆孔、矩形孔或方孔)为透光部分。这些掩膜板图案具有不同的透光面积，可以用于形成不同大小的液晶聚合区域，从而调整像素单元中的液晶层有效调制区域的面积。例如可以使得所述掩膜板85与第一像素单元PX1重合的区域的遮光面积小于与第二像素单元PX2重合的区域的遮光面积。这可以用于将第一像素单元PX1的液晶层有效调制区域的面积设置成比第二像素单元PX2更小。采用改变液晶聚合区域的方式来调整像素单元中的液晶层有效调制区域的面积需要额外制备用于紫外光照射液晶层时的掩膜板。该掩膜板可以由任何遮光材料制成(例如金属)，不需要与显示面板制成一体，在显示面板的制作过程中可以对于不同的显示面板反复使用。
在本公开的一些实施例中，也可以将对电极进行图案化和调整液晶聚合区域的方案组合使用来改变像素单元中的液晶层有效调制区域的面积。
在本公开的实施例中，所述液晶层30例如可以包括聚合物网络稳定液晶或聚合物分散液晶。
本公开的实施例还提供了一种透明显示面板的制作方法。如图8所示，该方法包括：
步骤S10：提供第一基板、第二基板以及位于所述第一基板和第二基板之间的液晶层；
步骤S20：提供导光板，所述导光板位于所述第一基板的背离第二基板的一侧，所述导光板具有入光面，所述入光面位于所述导光板的外周侧；
步骤S30：提供光源组件，所述光源组件布置成朝向所述导光板的入光面发出光束；以及
步骤S40：在所述透明显示面板上设置多个像素单元，所述多个像素单元包括第一像素单元和第二像素单元，所述第一像素单元在导光板的光出射面上的正 投影的中心至所述导光板的入光面的距离小于所述第二像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离，其中，所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积小于所述第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积。
采用上述方法，如前所述，可以对像素单元中的液晶层有效调制区域进行调整，以改善透明显示面板的亮度均一性。
作为示例，所述第一像素单元PX1在导光板40的光出射面42上的正投影的中心至所述导光板40的入光面41的距离小于第一阈值，所述第二像素单元PX2在导光板40的光出射面42上的正投影的中心至所述导光板40的入光面41的距离大于第一阈值，所述第一阈值在第二基板20的远离所述液晶层30的表面至导光板40的背离液晶层30的表面之间的距离的10倍至50倍之间。
在一些实施例中，上述步骤S40还可包括：
对所述第一像素单元中的第一透明电极和第二透明电极中的一者或两者进行图案化，使得第一像素单元中的第一透明电极在导光板的光出射面上的正投影与第二透明电极在导光板的光出射面上的正投影的重叠面积小于第二像素单元中的第一透明电极在导光板的光出射面上的正投影与第二透明电极在导光板的光出射面上的正投影的重叠面积。
在另一些实施例中，上述步骤S40还可包括：
使用掩膜板对第一基板和第二基板之间的液晶层进行紫外光照射，所述掩膜板与第一像素单元重合的区域的遮光面积小于与第二像素单元重合的区域的遮光面积。
本公开的实施例还提供了一种电子装置，包括如上述任一实施例所述的透明显示面板。该电子装置可以为具有透明显示功能的任何装置，例如包括广告牌、视窗、数码相框等等。
虽然结合附图对本公开进行了说明，但是附图中公开的实施例旨在对本公开的实施例进行示例性说明，而不能理解为对本公开的一种限制。附图中的尺寸比例仅仅是示意性的，并不能理解为对本公开的限制。
上述实施例仅例示性的说明了本公开的原理及构造，而非用于限制本公开，本领域的技术人员应明白，在不偏离本公开的总体构思的情况下，对本公开所作的任何改变和改进都在本公开的范围内。本公开的保护范围，应如本申请的权利 要求书所界定的范围为准。
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Claims (21)

  1. 一种透明显示面板，包括：
    第一基板、第二基板以及位于所述第一基板和第二基板之间的液晶层；
    导光板，所述导光板位于所述第一基板的背离第二基板的一侧，所述导光板具有入光面，所述入光面位于所述导光板的外周侧；
    光源组件，所述光源组件布置成朝向所述导光板的入光面发出光束；
    所述透明显示面板上设置有多个像素单元，所述多个像素单元包括第一像素单元和第二像素单元，
    所述第一像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于所述第二像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离，
    其中，所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积小于所述第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积。
  2. 根据权利要求1所述的透明显示面板，其中，所述第一像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第一阈值，所述第二像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离大于第一阈值，所述第一阈值在第二基板的远离所述液晶层的表面至导光板的背离液晶层的表面之间的距离的10倍至50倍之间。
  3. 根据权利要求1所述的透明显示面板，其中，所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积为所述第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积的20％至80％。
  4. 根据权利要求3所述的透明显示面板，其中，所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积为所述第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积的40％至60％。
  5. 根据权利要求2所述的透明显示面板，其中，所述多个像素单元还包括第三像素单元，所述第一像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第一阈值且大于第二阈值，所述第三像素单元在导光 板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第二阈值，所述第三像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积小于所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积。
  6. 根据权利要求5所述的透明显示面板，其中，所述多个像素单元还包括第四像素单元，所述第三像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第二阈值且大于第三阈值，所述第四像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第三阈值，所述第四像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积小于所述第三像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积。
  7. 根据权利要求6所述的透明显示面板，其中，所述第一阈值和第二阈值之差与所述第二阈值和第三阈值之差相等，所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积、所述第三像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积和所述第四像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积依次递减所述第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积的5％至10％。
  8. 根据权利要求2所述的透明显示面板，其中，在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离大于第一阈值的所有像素单元具有面积相等的液晶层有效调制区域。
  9. 根据权利要求2所述的透明显示面板，其中，在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于第一阈值的多个像素单元的液晶层有效调制区域的面积随着所述像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离的减小而减小。
  10. 根据权利要求1所述的透明显示面板，其中，所述第一像素单元包括用于调制液晶层的第一透明电极和第二透明电极，所述第二像素单元包括用于调制液晶层的第三透明电极和第四透明电极，第一像素单元中的液晶层有效调制区域为所述第一透明电极在导光板的光出射面上的正投影和第二透明电极在导光板的光出射面上的正投影的重叠区域，第二像素单元中的液晶层有效调制区域为所 述第三透明电极在导光板的光出射面上的正投影和第四透明电极在导光板的光出射面上的正投影的重叠区域。
  11. 根据权利要求10所述的透明显示面板，其中，所述第一透明电极和第三透明电极位于所述液晶层的朝向所述导光板的光出射面的一侧，所述第二透明电极和第四透明电极位于所述液晶层的朝向所述第二基板的一侧，所述第一透明电极和第二透明电极中的至少一者在导光板的光出射面上的正投影的面积小于所述第三透明电极和第四透明电极中的至少一者在导光板的光出射面上的正投影的面积。
  12. 根据权利要求11所述的透明显示面板，其中，所述第一透明电极和第三透明电极位于所述液晶层的朝向所述导光板的光出射面的一侧，所述第二透明电极和第四透明电极位于所述液晶层的朝向所述第二基板的一侧，所述第一透明电极和第二透明电极中的一者或两者形成镂空图案。
  13. 根据权利要求11所述的透明显示面板，其中，所述第一像素单元还包括虚拟电极，所述虚拟电极与所述第一透明电极和第二透明电极均不电连接，所述第一透明电极或第二透明电极在导光板的光出射面上的正投影具有镂空区，所述虚拟电极在导光板的光出射面上的正投影位于所述镂空区中。
  14. 根据权利要求13所述的透明显示面板，其中，所述第一像素单元还包括虚拟电极，所述虚拟电极与所述第一透明电极和第二透明电极均不电连接，所述第一透明电极和第二透明电极中的一者在导光板的光出射面上的正投影具有镂空区，所述虚拟电极在导光板的光出射面上的正投影位于所述镂空区中，并与所述第一透明电极和第二透明电极中的另一者在导光板的光出射面上的正投影至少部分地重叠。
  15. 根据权利要求1所述的透明显示面板，其中，所述第一像素单元中的液晶聚合区域在导光板的光出射面上的正投影的面积小于第二像素单元中的液晶聚合区域在导光板的光出射面上的正投影面积。
  16. 根据权利要求15所述的透明显示面板，其中，第一像素单元中的液晶聚合区域在导光板的光出射面上的正投影的面积是第二像素单元中的液晶聚合区域在导光板的光出射面上的正投影面积的40％至60％。
  17. 根据权利要求1至16中任一项所述的透明显示面板，其中，所述液晶层包括聚合物网络稳定液晶或聚合物分散液晶。
  18. 一种透明显示面板的制作方法，包括：
    提供第一基板、第二基板以及位于所述第一基板和第二基板之问的液晶层；
    提供导光板，所述导光板位于所述第一基板的背离第二基板的一侧，所述导光板具有入光面，所述入光面位于所述导光板的外周侧；
    提供光源组件，所述光源组件布置成朝向所述导光板的入光面发出光束；
    在所述透明显示面板上设置多个像素单元，所述多个像素单元包括第一像素单元和第二像素单元，
    所述第一像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离小于所述第二像素单元在导光板的光出射面上的正投影的中心至所述导光板的入光面的距离，
    其中，所述第一像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积小于所述第二像素单元中的液晶层有效调制区域在导光板的光出射面上的正投影的面积。
  19. 根据权利要求18所述的方法，其中，在所述透明显示面板上设置多个像素单元包括：
    对所述第一像素单元中的第一透明电极和第二透明电极中的一者或两者进行图案化，使得第一像素单元中的第一透明电极在导光板的光出射面上的正投影与第二透明电极在导光板的光出射面上的正投影的重叠面积小于第二像素单元中的第一透明电极在导光板的光出射面上的正投影与第二透明电极在导光板的光出射面上的正投影的重叠面积。
  20. 根据权利要求18所述的方法，其中，在所述透明显示面板上设置多个像素单元包括：
    使用掩膜板对第一基板和第二基板之间的液晶层进行紫外光照射，所述掩膜板与第一像素单元重合的区域的遮光面积小于与第二像素单元重合的区域的遮光面积。
  21. 一种电子装置，包括根据权利要求1至17中任一项所述的透明显示面板。
PCT/CN2020/118872 2020-09-29 2020-09-29 透明显示面板、电子装置以及透明显示面板的制作方法 WO2022067517A1 (zh)

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