A thin transparent display

Abstract

The application discloses a kind of thin transparent display screen, including first bearing film layer, first adhesive film layer, LED light-emitting layer, second adhesive film layer and second bearing film layer being sequentially stacked in the direction of display screen thickness;LED light-emitting layer includes base film, and be arranged in the conductive circuit of base film, LED light-emitting body and electrical connection interface, LED light-emitting body is connected to electrical connection interface by conductive circuit, and electrical connection interface is used to receive external power supply and control signal;First adhesive film layer covers LED light-emitting body, and is clamped between first bearing film layer and LED light-emitting layer positive side;Second adhesive film layer fills the gap between LED light-emitting layer back side and second bearing film layer, and the thickness of first adhesive film layer is more than twice the thickness of second adhesive film layer.The application can make the whole display screen visually inductive, transparent, improve the visual perception of indoor personnel, and improve the use experience.

Description

Technical Field

[0001] This invention relates to the field of transparent LED display technology, and in particular to a thin transparent display screen. Background Technology

[0002] Transparent displays, especially transparent LED displays that can be attached to glass surfaces, are widely used in glass curtain walls, shop window displays, interior partitions, exhibition spaces, and other scenarios. These transparent displays need to display images or videos while maintaining the original light transmission and transparency of the glass as much as possible; their transparency directly affects the visual experience of people inside the room.

[0003] Existing transparent displays, when mounted on glass surfaces, still suffer from poor transparency and a foggy appearance. Furthermore, the conductive lines of these displays are visible, making it difficult to achieve a seamless viewing experience. Overall, existing transparent displays negatively impact visual perception and user experience.

[0004] Therefore, the above problems need to be addressed. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes a thin transparent display screen that makes the entire display screen visually imperceptible and transparent, improving the visual perception of indoor occupants and enhancing the user experience.

[0006] To solve the above-mentioned technical problems, the basic technical solution proposed by this invention is as follows:

[0007] This invention proposes a thin transparent display screen, comprising a first carrier film layer, a first adhesive film layer, an LED light-emitting layer, a second adhesive film layer, and a second carrier film layer, which are sequentially stacked along the thickness direction of the display screen.

[0008] The LED light-emitting layer includes a base film, as well as conductive lines, LED light-emitting elements, and electrical connection interfaces disposed on the base film. The LED light-emitting elements are connected to the electrical connection interfaces through the conductive lines, and the electrical connection interfaces are used to receive external power and control signals.

[0009] The first adhesive film layer covers the LED light-emitting body and is sandwiched between the first carrier film layer and the front side of the LED light-emitting layer;

[0010] The second adhesive film layer fills the gap between the back side of the LED light-emitting layer and the second carrier film layer, and the thickness of the first adhesive film layer is more than twice the thickness of the second adhesive film layer.

[0011] In some embodiments, the conductive lines include a metal mesh surface divided into multiple conductive regions as different electrical lines.

[0012] In some embodiments, the mesh structure of the plurality of conductive regions is the same, and the mesh structure of the entire metal mesh surface has the same orientation. In the gaps between different conductive regions, there are staggered mesh extension lines. The mesh extension lines extend from the mesh of the conductive region and are connected to the mesh of the conductive region. Adjacent to them are mesh extension lines extending from the mesh of the neighboring conductive region. The ends of the mesh extension lines are at a distance that can maintain electrical insulation from the adjacent conductive regions.

[0013] In some embodiments, the wire spacing of the metal mesh is greater than or equal to 1 mm, and the wire diameter is less than or equal to 50 μm.

[0014] In some embodiments, the metal mesh surface has flush ends in each conductive area, the flush ends are connected to the conductive areas, and the flush ends are connected to the electrical connection interface via connecting wires.

[0015] In some embodiments, the base films of the first carrier film layer, the second carrier film layer, and the LED light-emitting layer are each independently selected from PET, PI, or CPI.

[0016] In some embodiments, the materials of the first adhesive layer and the second adhesive layer are independently selected from EVA, PVB or SGP.

[0017] In some embodiments, the thickness of the first and second carrier films ranges from 0.15 mm to 0.25 mm.

[0018] In some embodiments, the thickness of the first adhesive film layer ranges from 0.6 mm to 1.5 mm, the thickness of the LED light-emitting layer base film ranges from 0.15 mm to 0.25 mm, and the thickness of the second adhesive film layer ranges from 0.1 mm to 0.3 mm.

[0019] In some embodiments, the thin transparent display screen further includes an adhesive layer disposed outside the second carrier film layer (50), and a release film is disposed outside the adhesive layer.

[0020] The beneficial effects of this invention are:

[0021] The thin transparent display screen provided by this invention utilizes a first adhesive film layer to form a relatively continuous transparent medium layer between the first carrier film layer and the LED light-emitting layer, and utilizes a second adhesive film layer to form a relatively continuous transparent medium layer between the second carrier film layer and the LED light-emitting layer. This makes it less likely for light to be significantly scattered by local air interfaces when passing through the display screen, thereby improving the visual transparency and perspective uniformity of the screen.

[0022] Meanwhile, the thickness of the first adhesive film layer is set to be more than twice the thickness of the second adhesive film layer, so that the first adhesive film layer can provide sufficient coverage space on the light-emitting side to cover the LED light source and related protruding structures. The second adhesive film layer achieves back-side gap compensation with a smaller thickness, which can avoid the overall thickness of the transparent display screen, the increase of optical path and the increase of haze caused by the back-side adhesive film being too thick. The asymmetric adhesive film thickness design can improve the transparent visual effect under the condition of thinning of the transparent display screen.

[0023] Furthermore, by setting the same grid structure in multiple conductive areas, the grid structure of the entire metal mesh surface follows the same direction, and with the grid extension lines interlaced in the gaps between different conductive areas, combined with the limitation of the spacing and diameter of the metal mesh lines, the metal mesh surface can be made almost invisible visually, thus improving the visual transparency of the thin transparent display screen.

[0024] The thin transparent display screen proposed in this invention can make the entire display screen visually imperceptible and transparent, which can improve the visual perception of indoor people and enhance the user experience. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of a portion of the conductive circuitry in an embodiment of the present invention;

[0027] Figure 3 for Figure 2 Enlarged view of part A;

[0028] Figure 4 for Figure 3 Enlarged view of component B;

[0029] Figure 5 This is a schematic cross-sectional view of an embodiment of the present invention;

[0030] Figure 6 for Figure 5 Enlarged view of part C.

[0031] Figure label:

[0032] 100. Thin transparent display screen; 10. First carrier film layer; 20. First adhesive film layer; 30. LED light-emitting layer; 31. Base film; 32. Conductive circuit; 321. Lamp bead pad; 322. Metal mesh surface; 3221. Flush end; 3222. Mesh extension line; 323. Connecting line; 33. LED light-emitting body; 34. Electrical connection interface; 40. Second adhesive film layer; 50. Second carrier film layer. Detailed Implementation

[0033] The following will be combined with the appendix Figure 1 To be continued Figure 6 The technical solutions in the embodiments of the present invention have been clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] Example

[0035] See Figures 1 to 6 This embodiment provides a thin transparent display screen 100, which includes a first carrier film layer 10, a first adhesive film layer 20, an LED light-emitting layer 30, a second adhesive film layer 40 and a second carrier film layer 50 stacked sequentially along the thickness direction of the display screen.

[0036] The LED light-emitting layer 30 includes a base film 31, and conductive lines 32, LED light-emitting elements 33, and electrical connection interfaces 34 disposed on the base film 31. The LED light-emitting elements 33 are connected to the electrical connection interfaces 34 through the conductive lines 32. The LED light-emitting elements 33 can be LED chips, and may or may not have a driver chip. The conductive lines 32 are provided with chip pads 321, and the LED light-emitting elements 33 are mounted on the chip pads 321. The conductive lines 32 and chip pads 321 may protrude from the surface of the base film 31, for example, by etching to form conductive lines on the surface of the base film; the conductive lines 32 and chip pads 321 may also be embedded in the surface of the base film 31, approximately flush with the surface of the base film, for example, by embedding a groove in the base film and then filling the groove with copper material to make it flush with the surface of the base film to form conductive lines.

[0037] The electrical connection interface 34 is used to receive external power and control signals. The electrical connection interface 34 may be a solder pad exposed from the first carrier film layer 10 and the first adhesive film layer 20. The electrical connection interface 34 can be connected to external devices by setting a ribbon cable connector on the electrical connection interface 34 or by directly soldering wires.

[0038] The LED light emitter 33 has a light-emitting surface facing the outside of the base film 31. The first carrier film layer 10 and the first adhesive film layer 20 are disposed on the side where the light-emitting surface of the LED light emitter 33 is located, and the second adhesive film layer 40 and the second carrier film layer 50 are disposed on the side away from the light-emitting surface of the LED light emitter 33.

[0039] The first adhesive film layer 20 is sandwiched between the first carrier film layer 10 and the LED light-emitting layer 30, and at least partially covers the LED light-emitting element 33. In some embodiments, the first adhesive film layer 20 may cover the LED light-emitting element 33, the lamp bead pads 33, and the protrusions formed by the conductive lines 32 on the front side of the base film 31, thereby reducing the air gap around the LED light-emitting element 33 and forming a more continuous transparent dielectric layer between the first carrier film layer 10 and the LED light-emitting layer 30. As a result, light is less likely to be significantly scattered by local air interfaces when passing through the display screen, which is beneficial to improving the visual transparency and perspective uniformity of the screen.

[0040] The second adhesive film layer 40 is sandwiched between the LED light-emitting layer 30 and the second carrier film layer 50, and is used to fill the gap between the back side of the LED light-emitting layer 30 and the second carrier film layer 50. The second adhesive film layer 40 can serve as a back-side compensation adhesive film layer, used to compensate and fill the interlayer gaps on the back side of the LED light-emitting layer 30, so that a more continuous transparent dielectric layer is formed between the second carrier film layer 50 and the LED light-emitting layer 30, thereby improving the visual transparency and uniformity of the screen.

[0041] In one embodiment, the thickness of the first adhesive layer 20 is more than twice the thickness of the second adhesive layer 40. This thickness relationship allows the first adhesive layer 20 to provide sufficient coverage space on the light-emitting side to cover the LED light-emitting element 33 and related protruding structures. The second adhesive layer 40, with its smaller thickness, compensates for the back-side gap, preventing excessive thickness of the back-side adhesive layer from increasing the overall thickness of the transparent display, increasing the optical path, and increasing haze. This asymmetric adhesive layer thickness design improves the transparent visual effect while maintaining a thinner transparent display.

[0042] The first carrier film layer 10 and the second carrier film layer 50 are located on both sides of the display screen, forming a clamping structure. This clamping structure holds and fixes the first adhesive film layer 20, the LED light-emitting layer 30, and the second adhesive film layer 40 in the middle, ensuring that the display screen maintains a certain mechanical strength despite its relatively thin overall thickness. Simultaneously, the first carrier film layer 10 and the second carrier film layer 50 also protect both sides of the LED light-emitting layer 30, reducing the impact of external scratches, bending, moisture, or contaminants on the LED light-emitting layer 30.

[0043] In some applications, an adhesive layer (not shown in the figure) can be provided outside the second carrier film layer 50, and a release film can be provided outside the adhesive layer to facilitate adhesion to the glass surface. In other applications, the thin transparent display screen 100 can also be directly adhered to the glass surface by applying adhesive directly to the glass surface.

[0044] In one embodiment, the base film 31 of the first carrier film layer 10, the second carrier film layer 50, and the LED light-emitting layer 30 are each independently selected from PET (Polyethylene Terephthalate), PI (Polyimide), CPI (Colorless Polyimide), or other transparent materials suitable for use on circuit boards. The materials of the first adhesive film layer 20 and the second adhesive film layer 40 are each independently selected from EVA (Ethylene-vinyl Acetate Copolymer), PVB (Polyvinyl Butyral), SGP (SentryGlas® Plus), or other transparent adhesive film materials with bonding / adhesion properties. All of the above materials have good light transmittance and are suitable for glass attachment applications of the thin transparent display screen 100. In manufacturing, the layers are pressed together to form the thin transparent display screen 100. The pressing temperature, pressure, and duration can be selected according to the chosen materials.

[0045] In one specific embodiment, the thickness of the first carrier film layer 10 is 0.15 mm to 0.25 mm, the thickness of the first adhesive film layer 20 is 0.6 mm to 1.5 mm, the thickness of the base film 31 of the LED light-emitting layer 30 is 0.15 mm to 0.25 mm, the thickness of the second adhesive film layer 40 is 0.1 mm to 0.3 mm, and the thickness of the second carrier film layer 50 is 0.15 mm to 0.25 mm. Further, the overall thickness of the transparent display screen can be approximately 1.15 to 2.25 mm.

[0046] With the above structure, the thin transparent display screen 100 can sandwich and encapsulate the LED light-emitting layer 30 between two carrier film layers within a relatively small overall thickness; the first adhesive film layer 20 covers the protruding structure on the light-emitting side of the LED light-emitting body 33, and the second adhesive film layer 40 compensates and fills the back side 302 of the LED light-emitting layer 30. Thus, while maintaining the thinness and adhesion of the screen, the impact of air interface, interface scattering and line obstruction on indoor visual perception can be reduced, and the transparency and uniformity of the transparent display screen can be improved.

[0047] Furthermore, in some embodiments, see Figures 1 to 4The conductive lines 32 of the LED light-emitting layer 30 include a metal mesh 322. The metal mesh 322 can be divided into multiple electrically isolated or pre-connected conductive regions, each serving as a different electrical line. In some embodiments, the metal mesh 322 has a flush end 3221 in each conductive region, the flush end 3221 being in communication with the conductive region, and the flush end 3221 being connected to the electrical connection interface 34 via a connecting line 323.

[0048] As an example, if the LED emitter 33 is an LED bead with six pins, the metal mesh surface 322 includes a power line conductive area VDD, a ground line conductive area GND, a first signal input line conductive area DIN, a second signal input line conductive area BIN, a first signal transmission line conductive area DOUT / DIN, and a second signal transmission line conductive area DOUT2 / BIN. Each conductive area is provided with pads to connect to the LED bead's pins. For a row of LED beads, the power line conductive area VDD is connected to the power pin of each LED bead, the ground line conductive area GND is connected to the ground pin of each LED bead, the first signal input line conductive area DIN is connected to the first signal input pin of the first LED bead in the row, and the second signal input line conductive area BIN is connected to the second signal input pin of the first LED bead in the row. There are multiple first signal transmission line conductive areas DOUT / DIN, each connected to the first signal output pin of the LED bead and the first signal input pin of the next LED bead. There are multiple second signal transmission line conductive areas DOUT2 / BIN, each connected to the second signal output pin of the LED bead and the second signal input pin of the next LED bead. In another example, the LED emitter 33 may be an LED bead with four pins, and the metal mesh 322 may accordingly include a power line conductive area, a ground line conductive area, a signal input line conductive area, and a signal transmission line conductive area.

[0049] In some embodiments, see Figures 2 to 4The multiple conductive regions have the same mesh structure, and the entire metal mesh surface 322 has the same mesh structure orientation. Interlaced mesh extension lines 3222 are provided in the gaps between different conductive regions. Each mesh extension line 3222 extends from the mesh of its respective conductive region and is conductive to it. Adjacent to each extension line is another mesh extension line 3222 extending from the mesh of a neighboring conductive region. The ends of the mesh extension lines 3222 are at a distance sufficient to maintain electrical insulation from adjacent conductive regions. Because of the filling with mesh extension lines 3222, the gaps between conductive regions become less visually noticeable. Furthermore, since the entire metal mesh surface 322 has the same mesh structure orientation, the metal mesh surface 322, composed of multiple conductive regions, appears visually close to a single, unified mesh surface. Simultaneously, because the mesh extension lines 3222 extend from the mesh of their respective conductive regions and are conductive to them, the mesh extension lines 3222 can reduce the resistance of the conductive regions to a certain extent. Because of the grid extension line 3222, the grid structure of the conductive area can be made finer and / or sparser without increasing the overall resistance of the conductive area, making it less visually noticeable.

[0050] In some embodiments, the metal mesh 322 may be a square grid, a honeycomb grid, or other grid distribution. The metal may be copper, and the surface may be treated with immersion tin to change color and prevent corrosion. Preferably, the grid line spacing of the metal mesh 322 is greater than or equal to 1 mm, and the line diameter is less than or equal to 50 μm. According to the orthogonal grid approximation, when the line spacing is 1 mm and the line diameter is 50 μm, the aperture ratio (i.e., the percentage of the light-transmitting area to the total area) of the metal mesh 322 is approximately 90.25%; as the line spacing further increases or the line diameter further decreases, the aperture ratio further increases. This reduces the obstruction of ambient light by the conductive lines 32, improving the transparency for indoor occupants when observing through the screen.

[0051] Therefore, by setting the same grid structure for multiple conductive areas, the grid structure of the entire metal mesh 322 has the same orientation. In addition, the grid extension lines 3222 are interlaced in the gaps between different conductive areas. With the limitation of the line spacing and line diameter of the metal mesh 322, the metal mesh 322 can be made almost invisible visually, which improves the visual transparency of the thin transparent display screen 100.

[0052] In summary, the thin transparent display screen 100 provided by this invention utilizes a first adhesive film layer 20 to form a relatively continuous transparent dielectric layer between the first carrier film layer 10 and the LED light-emitting layer 30, and utilizes a second adhesive film layer 40 to form a relatively continuous transparent dielectric layer between the second carrier film layer 50 and the LED light-emitting layer 30. This makes it less likely for light to be significantly scattered by local air interfaces when passing through the display screen, thus improving the visual transparency and uniformity of the screen. At the same time, the thickness of the first adhesive film layer 20 is set to be more than twice the thickness of the second adhesive film layer 40, so that the first adhesive film layer 20 can provide sufficient coverage space on the light-emitting side to cover the LED light-emitting element 33 and related protrusions. The second adhesive film layer 40 achieves back-side gap compensation with a smaller thickness, avoiding the increase in overall thickness, optical path, and haze caused by an excessively thick back-side adhesive film. This asymmetric adhesive film thickness design enhances the transparent visual effect while maintaining a thinner transparent display. Furthermore, by setting the same mesh structure in multiple conductive areas, and ensuring the mesh structure of the entire metal mesh surface 322 follows the same direction, coupled with the interlaced mesh extension lines 3222 in the gaps between different conductive areas, and by limiting the line spacing and diameter of the metal mesh surface 322, the metal mesh surface 322 becomes almost invisible, improving the visual transparency of the thin transparent display 100. Therefore, the thin transparent display 100 proposed in this invention enables the display to be visually imperceptible and transparent, improving the visual experience for indoor occupants and enhancing the user experience.

[0053] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A thin transparent display screen, characterized in that, It includes a first carrier film layer, a first adhesive film layer, an LED light-emitting layer, a second adhesive film layer, and a second carrier film layer, which are sequentially stacked along the thickness direction of the display screen. The LED light-emitting layer includes a base film, as well as conductive lines, LED light-emitting elements, and electrical connection interfaces disposed on the base film. The LED light-emitting elements are connected to the electrical connection interfaces through the conductive lines, and the electrical connection interfaces are used to receive external power and control signals. The first adhesive film layer covers the LED light-emitting body and is sandwiched between the first carrier film layer and the front side of the LED light-emitting layer; The second adhesive film layer fills the gap between the back side of the LED light-emitting layer and the second carrier film layer, and the thickness of the first adhesive film layer is more than twice the thickness of the second adhesive film layer.

2. The thin transparent display screen according to claim 1, characterized in that, The conductive circuit includes a metal mesh surface, which is divided into multiple conductive regions to serve as different electrical circuits.

3. A thin transparent display screen according to claim 2, characterized in that, The multiple conductive regions have the same grid structure, and the grid structure of the entire metal mesh surface has the same orientation. In the gaps between different conductive regions, there are staggered grid extension lines. The grid extension lines extend from the grid of the conductive region and are connected to the grid of the conductive region. Adjacent to them are grid extension lines extending from the grid of the neighboring conductive region. The ends of the grid extension lines are at a distance that can maintain electrical insulation from the adjacent conductive regions.

4. A thin transparent display screen according to claim 2, characterized in that, The metal mesh has a line spacing of 1 mm or more and a wire diameter of 50 μm or less.

5. A thin transparent display screen according to claim 2, characterized in that, The metal mesh surface has flush ends in each conductive area, and the flush ends are connected to the conductive areas. The flush ends are connected to the electrical connection interface through connecting wires.

6. A thin transparent display screen according to claim 1, characterized in that, The base films of the first carrier film layer, the second carrier film layer, and the LED light-emitting layer are each independently selected from PET, PI, or CPI.

7. A thin transparent display screen according to claim 1, characterized in that, The materials of the first and second adhesive film layers are independently selected from EVA, PVB or SGP.

8. A thin transparent display screen according to claim 1, characterized in that, The thickness of the first and second carrier film layers ranges from 0.15 mm to 0.25 mm.

9. A thin transparent display screen according to claim 1, characterized in that, The thickness of the first adhesive film layer ranges from 0.6 mm to 1.5 mm, the thickness of the LED light-emitting layer base film ranges from 0.15 mm to 0.25 mm, and the thickness of the second adhesive film layer ranges from 0.1 mm to 0.3 mm.

10. A thin transparent display screen according to claim 1, characterized in that, It also includes an adhesive layer disposed outside the second carrier film layer, and a release film is disposed outside the adhesive layer.

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