Flexible LED transparent display module and LED transparent display screen

Abstract

The utility model provides a flexible LED (light-emitting diode) light-transmitting display module and an LED transparent display screen in order to solve the problems of the LED transparent display screen in the prior art due to splicing of LED transparent display modules based on transparent substrates. On one hand, the flexible LED transparent display module is provided, a transparent substrate in an LED transparent display module in the prior art is omitted, the mode that the LED lamp beads are directly installed on the flexible substrate-free flexible circuit net is adopted, and the substrate-free flexible circuit net is very thin and has flexibility; therefore, on the basis of ensuring high resolution and high light transmission, when a plurality of flexible LED transparent display modules are spliced, the splicing positions are easier to align, and the flexible LED transparent display modules are easier to connect. And the resolution ratio can even be higher. The gap error between the adjacent flexible LED transparent display modules is smaller, the gap at the splicing position is more uniform, and the good display effect of the flexible LED transparent display module is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of LEDs, in particular to the field of transparent LED displays. Background Art

[0002] Transparent LED displays are gradually being widely used in the market and have developed into various product forms. A transparent LED display technology that distributes LED lamp beads in an array on a transparent substrate has begun to emerge. Figure 1 、 Figure 2 As shown, an improved LED transparent display screen 1000 is provided, which includes a panel 200, a back plate 300 and an LED transparent display module 100 sandwiched between the panel 200 and the back plate 300; by combining multiple LED transparent display modules 100 to form a larger transparent display screen, a larger display area can be achieved. Figure 1 As shown, the LED transparent display module 100 includes a transparent substrate 3, on which a circuit layer 1 is provided, and an array of LED lamp beads 2 encapsulated with chips is mounted on the transparent substrate 3. This type of LED transparent display screen 1000 has advantages such as high transparency. However, under normal circumstances, the size of a single LED transparent display module 100 is limited. For example, one of its length and width can reach a maximum of 550mm. When a larger screen is required, multiple LED transparent display modules 100 must be spliced ​​together. When higher density and smaller pitch are required, such as a pitch below P3.9mm, due to certain processing errors in the transparent substrate 3, it is difficult to align the LED transparent display modules 100 at the splicing point. The LED transparent display screen 1000 has obvious bright and dark lines at the splicing point, affecting the display effect. Utility Model Content

[0003] In order to overcome the problems of the prior art, the utility model provides a flexible LED light-transmitting display module and an LED transparent display screen.

[0004] On one hand, the present application provides a flexible LED transparent display module, comprising a baseless flexible circuit network and LED lamp beads arranged in an array on the baseless flexible circuit network; the baseless flexible circuit network includes power supply lines arranged in sequence and having opposite polarities, and signal lines arranged between the power supply lines;

[0005] Electrode pin pads are equidistantly arranged on both sides of the power supply circuit, the signal circuit includes a signal pin pad, and the electrode pin pads and the signal pin pads form a lamp bead welding area; the LED lamp bead is welded on the lamp bead welding area;

[0006] The LED lamp bead comprises two electrode pins with opposite polarities and at least one signal pin; the electrode pins of the LED lamp bead are welded on the electrode pin pads with the same polarity; the signal pins of the LED lamp bead are welded in parallel or in series on the signal pin pads;

[0007] The LED lamp bead spacing is ≤8mm, and the width of at least one of the power supply circuit and the signal circuit is ≤1.5mm.

[0008] The present application cancels the transparent substrate in the LED transparent display module in the prior art, directly installs the LED lamp bead on the substrate-free flexible circuit network without substrate, the thickness of the substrate-free flexible circuit network is very thin, and the substrate-free flexible circuit network is flexible; in this way, when multiple flexible LED transparent display modules are spliced, the splicing position is easier to align and connect on the basis of ensuring high resolution and high light transmittance. The resolution can be even higher. The gap error between adjacent flexible LED transparent display modules is smaller, the gap at the splicing position is more uniform, and the good display effect is ensured.

[0009] The color of the circuit pattern layer formed by the existing LED transparent poster display module is generally the natural color of a metal material (generally copper foil) or a metal electroplated color (such as silver plating or nickel plating). The natural color of the copper foil or the metal electroplated color will have various reflection and interference colors in actual application, which is extremely detrimental to the LED display quality and is easy to interfere with the display effect. Therefore, the preferred mode can be further optimized and improved.

[0010] Preferably, an anti-interference ink layer is formed on at least one side surface of the substrate-free flexible circuit network on which the LED lamp bead is installed. In this way, the interference caused by the natural color of the circuit pattern layer can be greatly reduced by means of the anti-interference ink layer.

[0011] The applicant found in the research and development that the LED lamp bead can adopt a TOP type lamp bead or a CHIP type lamp bead. Because the pixel spacing is small, the CHIP type lamp bead has enough space to place a driving IC and a light-emitting wafer in a small size range, and is the most optimal choice. However, the CHIP type lamp bead has the disadvantage that RGB will leak light to the surrounding, forming interference colors between pixels.

[0012] Preferably, the LED lamp bead is a CHIP type lamp bead, and the side edge of the CHIP type lamp bead is provided with an anti-light transmission ink layer. In this way, the light leakage of the CHIP type lamp bead is eliminated, interference is avoided, and the display quality is further improved.

[0013] Preferably, the color of the anti-interference ink layer on the substrate-free flexible circuit network and the anti-light transmission ink layer on the side edge of the CHIP type lamp bead is one of black, dark gray, dark blue, and dark purple.

[0014] Preferably, each of the LED lamp bead structures is identical; the power supply circuit includes a first power supply circuit and a second power supply circuit with opposite polarities, the electrode pin pad includes a first electrode pin pad and a second electrode pin pad; the first electrode pin pad and the second electrode pin pad on the lamp bead welding areas of adjacent rows are opposite in position, and the LED lamp beads mounted on the lamp bead welding areas of the adjacent rows are different in mounting angle by 180°.

[0015] Or the first electrode pin pad and the second electrode pin pad on the lamp bead welding areas of adjacent columns are opposite in position; the LED lamp beads mounted on the lamp bead welding areas of the adjacent columns are different in mounting angle by 180°.

[0016] Preferably, the LED lamp bead includes first lamp beads and second lamp beads with opposite arrangement of electrode pins; the first electrode pin pad and the second electrode pin pad on the lamp bead welding areas of adjacent columns are identical in position, and the LED lamp beads on the adjacent columns are the first lamp beads and the second lamp beads, respectively.

[0017] Preferably, the signal pin pad includes an input signal pin pad and an output signal pin pad.

[0018] The input signal pin pad on a rear lamp bead welding area of adjacent string-connected lamp bead welding areas is connected to the output signal pin pad on a front lamp bead welding area.

[0019] The second aspect of the present application provides an LED transparent display screen, comprising a back plate, a panel, and one or more transparent display modules arranged between the back plate and the panel, wherein the transparent display module is the flexible LED transparent display module described above.

[0020] The improved LED transparent display screen of the present application cancels the transparent substrate in the LED transparent display module in the prior art, and directly installs LED lamp beads on the flexible substrate-free flexible circuit network. The thickness of the substrate-free flexible circuit network is very thin, and it is flexible. In this way, when multiple flexible LED transparent display modules are spliced, the splicing position is easier to align and connect, and the resolution can be even higher. The gap error between adjacent flexible LED transparent display modules is smaller, and the gap at the splicing position is more uniform, ensuring good display effect.

[0021] Preferably, the back plate and the panel are filled with potting glue, and the potting glue fixes the flexible LED transparent display module between the back plate and the panel.

[0022] Preferably, the display driving device is arranged on the top of the transparent display module and used for driving the flexible LED transparent display module; the display driving device comprises a power supply and a controller, and the flexible LED transparent display module is connected with the power supply and the controller in the display driving device through an interface circuit.

[0023] Preferably, the display driving device further comprises an adapter plate, the interface circuit on the flexible LED transparent display module is plugged on the adapter plate, and the adapter plate is electrically connected with the power supply and the controller in the display driving device.

[0024] Preferably, the number of the transparent display modules is two or more, the most edge power supply lines on the flexible circuit net of the adjacent LED transparent display modules are overlapped and connected, and the polarities of the power supply lines are the same. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a sectional view of an LED transparent display module provided in the prior art;

[0026] Figure 2 is a sectional view of an LED transparent display screen provided in the prior art;

[0027] Figure 3a is a sectional view of a flexible LED transparent display module provided in the embodiment of the present application;

[0028] Figure 3b is a perspective view of a flexible LED transparent display module provided in the embodiment of the present application;

[0029] Figure 4 is a sectional view of an LED transparent display screen provided in the embodiment of the present application;

[0030] Figure 5 is a front view of a flexible LED transparent module provided in the embodiment of the present application;

[0031] Figure 6 is Figure 5 a back view;

[0032] Figure 7 is Figure 5 an enlarged view of A in the absence of a line coating;

[0033] Figure 8 is a further improved view in the embodiment 7;

[0034] Figure 9 is Figure 8 a further improved view in the embodiment 7;

[0035] Figure 10 is a perspective view of the LED transparent display provided in the specific embodiments of the present application;

[0036] Figure 11 is a front view of the LED transparent display provided in the specific embodiments of the present application;

[0037] Figure 12 is a side view of the LED transparent display provided in the specific embodiments of the present application;

[0038] Figure 13 is Figure 12 is an enlarged view of C in FIG. 1;

[0039] Figure 14 is Figure 12 is an enlarged view of D in FIG. 1;

[0040] Figure 15 is a cross-sectional view of the splicing of two or more transparent display modules in the prior art;

[0041] Figure 16 is a cross-sectional view of the edge splicing of two or more flexible transparent display modules in the specific embodiments of the present application.

[0042] In the background art, the reference signs are as follows:

[0043] 1, circuit pattern layer; 2, LED lamp bead; 3, transparent substrate; 100, LED transparent display module; 200, panel; 300, back plate; 1000, LED transparent display.

[0044] In the specific embodiments, the reference signs are as follows:

[0045] 1, base-free flexible circuit net; 2, LED lamp bead; 100, flexible LED transparent display module; 200, panel; 300, back plate; 400, display driving device; 500, potting adhesive; 1000, LED transparent display;

[0046] 10, lamp bead welding area; 10a, signal input pin pad; 10b, signal output pin pad; 10c, first electrode pin pad; 10d, second electrode pin pad; 11, power supply circuit; 11a, first power supply circuit; 11b, second power supply circuit; 12, signal circuit; 13, anti-interference ink layer; 14, interface circuit; 15, lap joint; 2a, first lamp bead; 2b, second lamp bead;

[0047] 20, anti-transmission light ink layer; 401, power supply; 402, controller; 403, adapter plate. Specific embodiments

[0048] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and do not limit the utility model.

[0049] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0050] In the description of the utility model, it should be pointed out that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0051] Example 1

[0052] As shown in the figure, the example provides a flexible LED transparent display module and LED flexible transparent display screen, as shown in the figure, Figures 3a-6 , Figure 3a , Figure 3bAs shown, the flexible LED transparent display module 100 includes a baseless flexible circuit net 1 and LED lamp beads 2 arranged in an array on the baseless flexible circuit net 1; the baseless flexible circuit net 1 includes a power supply circuit 11, a signal circuit 12, and a lamp bead welding area 10, and the LED lamp beads 2 are welded on the lamp bead welding area 10; specifically, the flexible LED transparent display module 100 includes a baseless flexible circuit net 1 and LED lamp beads 2 arranged in an array on the baseless flexible circuit net 1; the baseless flexible circuit net 1 includes power supply circuits 11 arranged in sequence and spaced apart and having opposite polarities, and a signal circuit 12 arranged between the power supply circuits; the power supply circuits 1 extend out electrode pin pads arranged at equal distances on both sides, the signal circuit includes signal pin pads, and the electrode pin pads and the signal pin pads form the lamp bead welding area 10; the LED lamp beads 2 are welded on the lamp bead welding area 10; in this way, the flexible LED transparent display module shown in the figure can be made Figure 3b As shown, the flexible LED transparent display module 100 includes a baseless flexible circuit net 1 and LED lamp beads 2 arranged in an array on the baseless flexible circuit net 1; the baseless flexible circuit net 1 includes a power supply circuit 11, a signal circuit 12, and a lamp bead welding area 10, and the LED lamp beads 2 are welded on the lamp bead welding area 10; specifically, the flexible LED transparent display module 100 includes a baseless flexible circuit net 1 and LED lamp beads 2 arranged in an array on the baseless flexible circuit net 1; the baseless flexible circuit net 1 includes power supply circuits 11 arranged in sequence and spaced apart and having opposite polarities, and a signal circuit 12 arranged between the power supply circuits; the power supply circuits 1 extend out electrode pin pads arranged at equal distances on both sides, the signal circuit includes signal pin pads, and the electrode pin pads and the signal pin pads form the lamp bead welding area 10; the LED lamp beads 2 are welded on the lamp bead welding area 10; in this way, the flexible LED transparent display module shown in the figure can be made

[0053] Specifically, the LED lamp beads 2 include two electrode pins having opposite polarities and at least one signal pin; the electrode pins of the LED lamp beads are welded on the electrode pin pads having the same polarity as the electrode pins; each lamp bead welding area 10 is provided with pin pads corresponding to the pins of the LED lamp beads 2;

[0054] The signal pins of the LED lamp beads are welded in parallel or in series on the signal pin pads;

[0055] The LED lamp beads have a spacing of ≤8 mm, and the width of at least one of the power supply circuit and the signal circuit is ≤1.5 mm.

[0056] The signal circuit 12 is connected to the signal pin pads on the lamp bead welding area 10 to provide control signals for the LED lamp beads 2; and the power supply circuit 11 is electrically connected to the electrode pin pads on the lamp bead welding area 10 to provide power supply for the LED lamp beads 2.

[0057] In this example, the transparent substrate in the LED transparent display module in the prior art is cancelled, and the LED lamp beads 2 are directly mounted on the baseless flexible circuit net 1 without a substrate; the baseless flexible circuit net 1 is very thin and flexible; in this way, when multiple flexible LED transparent display modules 100 are spliced, the splicing positions are easier to align and connect, and the resolution can be even higher; the gap error between adjacent flexible LED transparent display modules 100 is smaller, the gap at the splicing position is more uniform, and the display effect is good.

[0058] LED lamp bead 2 is generally known to the public, because the non-application core innovation content, only do a simple introduction. LED lamp bead 2 in this example includes a driving chip (or driving IC) and light emitting chip. Its corresponding lamp bead welding area 10 is provided with a plurality of pins, in this example, the pins include two electrode pins and two signal pins; the two electrode pins include a first electrode pin and a second electrode pin; the polarity of the two electrode pins is opposite, for example, the first electrode pin is used as the positive electrode pin; the second electrode pin is used as the negative electrode pin. It is used to provide power supply for the light emitting chip in the LED lamp bead 2; the two signal pins are respectively called the first signal input pin and the first signal output pin; the driving chip is provided with an interface which is electrically connected with each light emitting chip and each pin through binding wire. In this example, the light emitting chip includes a red light emitting chip, a green light emitting chip and a blue light emitting chip; it is arranged in a straight line; of course, it can also be arranged in a triangular shape. The light emitting chip can be arranged on the driving chip or partially arranged on the driving chip. Of course, according to the different control modes, the signal pins for inputting and outputting control signals can also be multiple. For example, two groups of input signal pins and two groups of output signal pins.

[0059] As shown in Figure 7 , the color of the circuit pattern layer formed by the existing LED transparent poster display module is generally the natural color of the metal material (generally copper foil), and the copper foil natural color will have various reflections and interference colors of the copper natural color in actual application, which is extremely unfavorable to the LED display quality and is easy to interfere with the display effect. The applicant also found in the research and development that the LED lamp bead 2 can adopt TOP type lamp bead or CHIP type lamp bead, because the pixel pitch is relatively small, the CHIP type lamp bead has enough space to place the driving IC and the light emitting chip in a small size range, which is the best choice. However, the disadvantage of the CHIP type lamp bead is that RGB will leak light to the surrounding, forming interference color between pixels.

[0060] As shown in Figure 8 , preferably, the anti-interference ink layer 13 is formed on at least one side surface of the LED lamp bead 2 installed on the baseless flexible circuit net 1. Through this way, the interference caused by the natural color of the circuit pattern layer can be greatly reduced by the anti-interference ink layer 13. Or, better, the anti-interference ink layer 13 is formed on both side surfaces of the baseless flexible circuit net 1.

[0061] As shown in Figure 9 , preferably, the LED lamp bead 2 is a CHIP type lamp bead, and the CHIP type lamp bead is provided with an anti-light transmission ink layer 20 on the side edge. In this way, the light leakage of the CHIP type lamp bead is eliminated, the interference is avoided, and the display quality is further improved.

[0062] As for the anti-interference ink layer 13 and the anti-transmission ink layer 20, in general, a suitable anti-interference or anti-transmission ink can be found through color selection. In terms of parameter limitation, the depth of color can be quantified by the color depth value (such as Integ value). The greater the color depth value, the deeper the color, and the better the light shielding effect. In general, the color depth value is related to the lightness range and the color category. Lightness range: choose a color with a low lightness value, i.e. a darker color. In the CIELAB color space, a lower value of the lightness index L (such as L < 30) generally indicates a darker color with lower light transmission. However, please note that this range is not absolute, as the color performance under different materials and light sources may vary. Color category: prefer dark colors such as black, dark gray, dark blue, dark purple, etc. These colors give a stable and heavy feeling in vision, and also have good light shielding effect.

[0063] Preferably, the color of the anti-interference ink layer 13 on the baseless flexible circuit net 1 and the anti-transmission ink layer 20 on the side of the CHIP type lamp bead is one of black, dark gray, dark blue, and dark purple.

[0064] As shown in Figure 4 、 Figure 5 , the specific implementation of the baseless flexible circuit net 1 will be introduced in the following specific ways. The power supply circuit 11 includes a plurality of first power supply circuits 11a and second power supply circuits 11b with opposite polarities; the electrode pin pads include first electrode pin pads 10c and second electrode pin pads 10d with opposite polarities; and the signal pin pads include signal input pin pads 10a and signal output pin pads 10b.

[0065] The first power supply circuit 11a is electrically connected to the first electrode pin pad 10c on each lamp bead welding area 10, and the second power supply circuit 11b is electrically connected to the second electrode pin pad 10d on each lamp bead welding area 10. In this way, the first power supply circuit 11a and the second power supply circuit 11b can supply power to the LED lamp bead 2, and at the same time, the signal pin pads can provide control signals to the LED lamp bead 2.

[0066] The input signal pin pad on the next lamp bead welding area 10 of the adjacent string-connected lamp bead welding area 10 is connected to the output signal pin pad on the previous lamp bead welding area 10.

[0067] As for the way of signal provision, it can be in series or in parallel, for example, the series mode is chosen in this example to provide signals. Preferably, as shown in Figure 5 、 Figure 6As shown, the baseless flexible circuit net 1 is provided with N rows*M columns of lamp bead welding areas 10; the signal pin pads in the N lamp bead welding areas 10 in the same column are sequentially connected in series through the signal lines 12; (or, the signal pin pads in the M lamp bead welding areas 10 in the same row are sequentially connected in series through the signal lines 12).

[0068] As for the power supply mode, each column of LED lamp beads 2 or each row of LED lamp beads 2 can have independent first power supply lines 11a and second power supply lines 11b on both sides thereof, but the first power supply lines 11a or the second power supply lines 11b can also be shared between adjacent LED lamp beads 2. For example, as shown in the embodiment, Figure 5 、 Figure 6 the power supply lines 11 in this embodiment include a plurality of first power supply lines 11a and second power supply lines 11b arranged in columns (or rows);

[0069] The first power supply lines 11a and the second power supply lines 11b arranged in columns are arranged in parallel with each column of LED lamp beads 2, and each column of lamp bead welding areas 10 arranged in columns is arranged between the first power supply lines 11a and the second power supply lines 11b arranged in parallel.

[0070] Of course, the following mode is also feasible, which is essentially the same. The first power supply lines 11a and the second power supply lines 11b arranged in rows are arranged in parallel with each row of LED lamp beads 2, and each row of lamp bead welding areas 10 arranged in rows is arranged between the first power supply lines 11a and the second power supply lines 11b arranged in parallel.

[0071] As for the implementation mode of the above-mentioned power supply lines 11 and signal lines 12, there can be many. For example, the first power supply lines 11a and the second power supply lines 11b arranged in parallel are metal layers printed on a transparent substrate; generally, a copper foil layer printed. Prepared by, for example, FPC (flexible printed circuit board). Only the lamp bead welding area 10 can be realized by printing, and the power supply lines 11 and the signal lines 12 can be realized by copper foil or copper wire to realize the connection, or other replaceable metal wire or metal foil to realize the electrical connection.

[0072] Among them, the first electrode pin pad 10c on the lamp bead welding area 10 is integrally printed with the adjacent first power supply line 11a; the second electrode pin pad 10d on the lamp bead welding area 10 is integrally printed with the adjacent second power supply line 11b.

[0073] As for the structure of the LED lamp bead 2, it can be installed by using an array of completely same LED lamp beads 2, or it can be arranged by using opposite polarity lamp beads in adjacent rows or adjacent columns. The following are several specific implementation modes.

[0074] As an embodiment, the LED lamp beads 2 are of the same structure; the first electrode pin pad 10c and the second electrode pin pad 10d on the lamp bead welding area 10 of the adjacent row are opposite in position, the LED lamp beads 2 installed on the lamp bead welding area 10 of the adjacent row are installed at an angle difference of 180° (i.e. installed with a relative rotation of 180 degrees); or the first electrode pin pad 10c and the second electrode pin pad 10d on the lamp bead welding area 10 of the adjacent column are opposite in position; the LED lamp beads 2 installed on the lamp bead welding area 10 of the adjacent column are installed at an angle difference of 180°. Through the implementation of this way, the color difference caused by the LED lamp beads 2 in the signal concatenation process can be effectively reduced.

[0075] As another embodiment, as shown in the figure, Figure 5 the LED lamp beads 2 include first lamp beads and second lamp beads with opposite electrode pins; the first electrode pin pad 10c and the second electrode pin pad 10d on the lamp bead welding area 10 of the adjacent column are the same in position, and the LED lamp beads 2 on the adjacent column are the first lamp beads and the second lamp beads respectively. Or, the first electrode pin pad 10c and the second electrode pin pad 10d on the lamp bead welding area 10 of the adjacent row are the same in position, and the LED lamp beads 2 on the adjacent row are the first lamp beads and the second lamp beads respectively. When it is required to have a smaller pixel pitch and have a better physical permeability (i.e. transparency), for example, it is required that the pixel pitch is less than 3.9mm, and the physical permeability is still maintained to be more than 50%. In the case of such a small pixel pitch, the LED lamp beads 2 used contain a driving IC and a light emitting chip, and it is difficult for a general TOP type lamp bead to realize the opposite arrangement of the electrode pins between the LED lamp beads 2 in the adjacent columns, so a CHIP type lamp bead is generally used to realize the small size range containing the driving IC and the light emitting chip.

[0076] As a third way, the first electrode pin pad 10c and the second electrode pin pad 10d on the lamp bead welding area 10 of the adjacent column are opposite in position; wherein the first lamp beads and the second lamp beads with opposite electrode pins are respectively installed on the lamp bead welding area 10 of the adjacent column.

[0077] Or, the first electrode pin pad 10c and the second electrode pin pad 10d on the lamp bead welding area 10 of the adjacent row are opposite in position; wherein the first lamp beads and the second lamp beads with opposite electrode pins are respectively installed on the lamp bead welding area 10 of the adjacent row.

[0078] The following describes the preparation process of the flexible LED display module, as an implementable way, etching or any other implementable process is used on a rigid or flexible substrate to form the above-mentioned lamp bead welding area 10, power supply circuit 11 and signal circuit 12, so as to form the baseless flexible circuit net 1 in the application on a substrate, then the baseless flexible circuit net 1 is peeled off from the substrate, and the baseless flexible circuit net 1 obtained after peeling is sprayed or brushed to form the anti-interference ink layer 13. Then the LED lamp bead 2 which has been sprayed or brushed with the anti-light penetration ink layer 20 is installed. Or the LED lamp bead 2 can be installed first, and then the four sides of the LED lamp bead 2 are sprayed or brushed with the anti-light penetration ink layer 20. In this way, the flexible LED transparent display module 100 described in this example can be obtained.

[0079] Of course, the LED lamp bead 2 can also be installed on the intermediate product with a substrate first, and then the flexible LED transparent display module 100 is obtained by peeling off the substrate, and finally the flexible LED transparent display module 100 is sprayed or brushed with the anti-interference ink layer 13 and the anti-light penetration ink layer 20. Of course, other processes that can prepare the flexible LED transparent display module 100 are also feasible, and the products obtained by the processes are also within the protection scope of the application.

[0080] Example 2

[0081] To more clearly explain the LED flexible display screen, further explanation and description are made by the following figures Figure 4 、 10 - Figure 16 As shown in Figure 4 , the present example provides an LED transparent display screen 1000, which includes a back plate 300, a panel 200 and one or more transparent display modules sandwiched between the back plate 300 and the panel 200, and the transparent display module is the flexible LED transparent display module 100 in the above-mentioned embodiment 1. The back plate 300 and the panel 200 are generally transparent panels 200, such as tempered glass or other transparent plastic. In most scenarios, the back plate 300 and the panel 200 are rigid transparent plates, and in a small number of application scenarios, they can also be flexible transparent plates.

[0082] The LED transparent display screen 1000 can have various application fields, for example, in the field of transparent LED poster display screen, the transparent LED poster display screen can change the content at any time, and does not hinder the light transmission of the window, and is gradually welcomed by the market. However, due to the size limitation of the transparent LED poster display screen, the area is generally about 1-1.5 m2, the height-width ratio of the display area is generally 1.56-1.79, and the height:width ratio is close to 16:9. It is difficult to balance the "transparency" and "screen resolution". At present, the pixel pitch of most transparent LED poster screens is ≥3.9 mm, and the transparency is <50%, which still cannot reach the ideal clarity and appropriate transparency. The LED flexible display screen provided in the example can effectively obtain ideal clarity and transparency. The flexible LED transparent display module 100 is clamped between the back plate 300 and the panel 200, and is protected in front and back, and a power supply 401 and a controller 402 are arranged at one end. In the example, the pixel pitch of each LED lamp bead 2 is less than 3.9 mm, and the size of the LED lamp bead 2 is preferably less than 1.5 mm x 1.5 mm. The transparent LED poster screen can be made, and has good transparency effect and can display clear poster content.

[0083] When the back plate 300 and the panel 200 are flexible materials, for example, the materials can be PET (English name: Polyethylene terephthalate, Chinese name: polyethylene terephthalate), PC (Chinese name: polycarbonate, English name: polycarbonate), SGP (ion type intermediate film), PI (English name: polyimide, Chinese name: polyimide), PVB (a glass interlayer film), EVA (English name: ethylene-vinyl acetate copolymer, Chinese name: ethylene-vinyl acetate copolymer) and the like, which can be made into an LED flexible transparent display screen.

[0084] As shown in Figures 10-12 The general LED transparent display screen 1000 further includes a display driving device 400, which is generally arranged at one side of the transparent screen display, for example, the left and right sides or the bottom or the top. In the example, the display driving device 400 is arranged at the top of the transparent display module, and is used to drive the flexible LED transparent display module 100. The display driving device 400 includes a power supply 401 and a controller 402, and the flexible LED transparent display module 100 is connected with the power supply 401 and the controller 402 in the display driving device 400 through an interface circuit 14.

[0085] As shown in Figure 13As shown, in this example, there is a local improvement, specifically, the display driving device 400 further comprises a adapter board 403, the interface circuit 14 on the flexible LED transparent display module 100 is plugged on the adapter board 403, and the adapter board 403 is electrically connected with the power supply 401 and the controller 402 in the display driving device 400. The interface circuit 14 is used to be electrically connected with the power supply circuit 11 and the signal circuit 12 on the flexible LED transparent display module 100, and forms a plug-in terminal through a plurality of gold fingers or pin headers, which is plugged with the adapter board 403. The rest of the display driving device 400 is known to the public and is not described here. The power supply 401 and the controller 402 of the display driving device are connected through the adapter board plug-in mode, which can more conveniently and quickly realize display driving, and the structure is simple and easy to realize.

[0086] As shown in the drawings, Figure 14 Preferably, the back plate 300 and the panel 200 are filled with potting glue 500, which seals the flexible LED transparent display module 100 between the back plate 300 and the panel 200.

[0087] As shown in the drawings, Figure 15 , Figure 16 The following will further explain why the present application has better effects to make the person skilled in the art more easily understand the concept of the present application. As shown in the drawings, Figure 15 It is a schematic diagram of the existing LED transparent display module 100 splicing to form a transparent display screen. Because the transparent substrate in the LED transparent display module 100 is generally rigid glass or other transparent plastic, and has a certain thickness, it is found in practice that it is particularly prone to form uneven height at the butt joint, and the gap is not easy to align. When the product is carefully observed, color difference is easily formed at the splicing position.

[0088] As shown in the drawings, Figure 16 The flexible LED display module is made by using the baseless flexible circuit net 1 of the present application, which can effectively avoid the above-mentioned situation. For example, when the number of the transparent display modules is two or more, the baseless flexible circuit net 1 on the adjacent LED transparent display modules 100 can be overlapped and welded. When it is overlapped and welded, it forms an overlapping position 15 as shown in the drawings. Figure 16 However, since the baseless flexible circuit net 1 itself is flexible, and its thickness is particularly thin, from 30 μm to 180 μm, and ideally from 100 μm to 180 μm.

[0089] The improved LED transparent display screen 1000 cancels the transparent substrate in the LED transparent display module in the prior art, directly installs the LED lamp beads 2 on the baseless flexible circuit net 1 without a substrate, the thickness of the baseless flexible circuit net 1 is very thin, and the baseless flexible circuit net 1 is flexible; in this way, when the plurality of flexible LED transparent display modules 100 are spliced, the splicing position is easier to align and connect on the basis of ensuring high resolution and high light transmittance, and the resolution can be even higher. The gap error between adjacent flexible LED transparent display modules 100 is smaller, the gap at the splicing position is more uniform, and the good display effect is ensured.

[0090] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flexible LED transparent display module, characterized in that: It includes a baseless flexible circuit network and LED lamp beads arranged in an array on the baseless flexible circuit network; the baseless flexible circuit network includes power supply lines arranged in sequence and with opposite polarities, and signal lines arranged between the power supply lines; Electrode pin pads are equidistantly arranged on both sides of the power supply circuit, the signal circuit includes a signal pin pad, and the electrode pin pads and the signal pin pads form a lamp bead welding area; the LED lamp bead is welded on the lamp bead welding area; The LED lamp bead includes two electrode pins with opposite polarities and at least one signal pin; the electrode pins of the LED lamp bead are welded on the electrode pin pads with the same polarity; the signal pins of the LED lamp bead are welded in parallel or in series on the signal pin pads; The distance between the LED lamp beads is ≤8mm, and the width of at least one of the power supply circuit and the signal circuit is ≤1.5mm.

2. The flexible LED transparent display module according to claim 1, characterized in that: An anti-interference ink layer is formed on the surface of at least one side of the baseless flexible circuit network where the LED lamp beads are installed.

3. The flexible LED transparent display module according to claim 1, characterized in that: The LED lamp beads are CHIP-type lamp beads, and the sides of the CHIP-type lamp beads are provided with an anti-light transmission ink layer.

4. The flexible LED transparent display module according to claim 3, characterized in that: The color of the anti-interference ink layer on the baseless flexible circuit network and the anti-light transmission ink layer on the side of the CHIP type lamp bead is one of black, dark gray, dark blue and dark purple.

5. The flexible LED transparent display module according to claim 1, characterized in that: The LED lamp beads have the same structure; the power supply circuit includes a first power supply circuit and a second power supply circuit with opposite polarities; the electrode pin pads include a first electrode pin pad and a second electrode pin pad; the first electrode pin pad and the second electrode pin pad on adjacent rows of lamp bead soldering areas are positioned opposite to each other, and the LED lamp beads installed on the adjacent rows of lamp bead soldering areas differ in installation angle by 180°; Or the first electrode pin pads and the second electrode pin pads on the lamp bead welding areas on adjacent columns are in opposite positions; the installation angles of the LED lamp beads installed on the lamp bead welding areas on the adjacent columns differ by 180°.

6. The flexible LED transparent display module according to claim 1, characterized in that: The LED lamp beads include a first lamp bead and a second lamp bead with electrode pins arranged oppositely; the first electrode pin pads and the second electrode pin pads on the lamp bead welding areas of adjacent columns are at the same position, and the LED lamp beads on the adjacent columns are respectively the first lamp bead and the second lamp bead.

7. The flexible LED transparent display module according to claim 6, characterized in that: The signal pin pads include input signal pin pads and output signal pin pads; The input signal pin pad on the rear lamp bead soldering area of ​​the adjacent serially connected lamp bead soldering areas is connected to the output signal pin pad on the front lamp bead soldering area.

8. A transparent LED display screen, characterized in that: It comprises a back plate, a panel and one or more transparent display modules sandwiched between the back plate and the panel, wherein the transparent display module is the flexible LED transparent display module according to any one of claims 1 to 7.

9. The transparent LED display screen according to claim 8, characterized in that: A potting compound is filled between the back plate and the panel, and the potting compound seals the flexible LED transparent display module between the back plate and the panel.

10. The transparent LED display screen according to claim 9, characterized in that: It also includes a display driving device, which is arranged on the top of the transparent display module and is used to drive the flexible LED transparent display module; the display driving device includes a power supply and a controller, and the flexible LED transparent display module is connected to the power supply and controller in the display driving device through an interface circuit.

11. The transparent LED display screen according to claim 10, characterized in that: The display driving device further includes an adapter board, the interface circuit on the flexible LED transparent display module is plugged into the adapter board, and the adapter board is electrically connected to the power supply and controller in the display driving device.

12. The transparent LED display screen according to claim 11, characterized in that: The number of the transparent display modules is more than two, and the power supply lines at the outermost edges of the baseless flexible circuit networks on adjacent LED transparent display modules are overlapped and connected, and the power supply lines have the same polarity.

Images