CN112185270A

CN112185270A - COB display module with interaction function, preparation method and display screen

Info

Publication number: CN112185270A
Application number: CN202010981871.1A
Authority: CN
Inventors: 张奇; 骆涛; 何昆鹏; 王启权; 吴涵渠
Original assignee: Shenzhen Aoto Electronics Co Ltd
Current assignee: Shenzhen Aoto Electronics Co Ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-01-05

Abstract

The application relates to a COB display module with an interactive function, a preparation method and a display screen, wherein the display module comprises a circuit board, an LED lamp bead, a photosensitive device, a shading enclosure, a packaging layer, an optical lens and a display driving chip; the first end face is provided with LED lamp beads and a photosensitive device in an array mode, and the photosensitive device is connected to form a photoelectric conversion array; each LED lamp bead and each photosensitive device are correspondingly provided with an optical lens, and a shading enclosure is arranged between the LED lamp beads and each photosensitive device and is covered by a first packaging layer; the photosensitive device senses external light and generates a sensing signal; the sensing signal generated by the photosensitive device at the interactive operation position changes beyond a preset range; by collecting and analyzing the change of the induction signal in the photoelectric conversion array, the position of the interactive operation can be identified. Compared with the existing scheme for installing the additional touch equipment, the scheme does not need to design a wide frame and an additional installation structure, and is small in overall size, simple in structure and easy to install.

Description

COB display module with interaction function, preparation method and display screen

Technical Field

The application relates to the technical field of LED display screens, in particular to a COB display module with an interaction function, a preparation method and a display screen.

Background

With the continuous development of LED display technology, LED display screens are applied in more and more scenes. People have higher and higher requirements on color, resolution and fine granularity of a display picture, and LED display screens are increasingly developed towards the direction of high resolution such as small dot spacing, more natural color reduction effect and the like.

To achieve even smaller dot spacing, the LED display industry, in the first days, achieved primarily by reducing the size of surface mount LEDs, achieving a dot spacing of 3mm step by step. In order to realize being less than 1 mm's point interval, produced COB (chip on board ) technique in the trade, directly encapsulated the LED chip on the PCB board to form a COB module, then utilized the concatenation of COB module to form the LED display screen.

Meanwhile, as the use of the LED display screen in indoor scenes is gradually increased, the demand of people for interactive operation of the LED display screen is also becoming higher and higher. Among them, the most prominent is touch operation. At present, a touch technology on an LED display screen is mainly based on an infrared or ultrasonic technology, and infrared devices or ultrasonic devices need to be installed on a peripheral frame of the LED display screen. Therefore, the existing LED display screen with the touch function has a larger frame structure; and the single infrared equipment or ultrasonic equipment is adopted, so that the installation is complex and the cost is high.

Disclosure of Invention

Based on this, it is necessary to provide a COB display module with an interactive function, a manufacturing method and a display screen aiming at the problems of large equipment size and complex installation of the existing touch scheme of the LED display screen.

The embodiment of the application discloses a COB display module with an interactive function, which comprises a circuit board, LED lamp beads, a photosensitive device, a shading enclosure, a packaging layer, an optical lens and at least one display driving chip;

the circuit board is provided with a first end face and a second end face which are opposite; the LED lamp beads are arranged on the first end face in an array mode, and the display driving chip is arranged on the second end face; the display driving chip is electrically connected with the LED lamp beads through a circuit in the circuit board and controls the LED lamp beads to work;

the photosensitive device array is arranged on the first end face of the circuit board, and all the photosensitive devices are connected to form a photoelectric conversion array;

the optical lens is correspondingly arranged on each LED lamp bead and each photosensitive device;

the shading enclosure is arranged between the LED lamp bead and the photosensitive device and used for preventing light rays emitted by the LED lamp bead from entering the photosensitive device;

the first packaging layer covers the optical lens and the shading enclosure;

the photosensitive device senses the intensity of external light and generates a sensing signal; when interactive operation is carried out, the sensing signal generated by the photosensitive device at the interactive operation position changes beyond a preset range; through the change and the position of collecting and analyzing photosensitive device's in the photoelectric conversion array sensing signal, discern the position of interactive operation at COB display module assembly.

In some embodiments, the height of the shading enclosure is greater than the height of the LED lamp bead.

In some embodiments, an optical colloid is filled between the optical lens and the LED lamp bead and between the optical lens and the photosensor, and the difference between the reflection coefficient of the optical colloid and the reflection coefficient of the optical lens is within a preset difference range.

In some embodiments, the touch control system further comprises a touch control scanning driving module and an induction signal collecting module; each photosensitive device is provided with a first end and a second end, and the first ends of the photosensitive devices in the same row in the photoelectric conversion array are connected with the induction signal collecting module through a circuit in the circuit board; the second ends of the photosensitive devices in the same column are connected with the touch scanning driving module through the circuit in the circuit board; the touch scanning driving module provides a touch scanning signal; the photosensitive device receives a touch scanning signal, senses external light, generates a sensing signal and outputs the sensing signal to the sensing signal collection module; the sensing signal collection module receives all sensing signals output by the photoelectric conversion array.

In some embodiments, further comprising a signal amplifier and a signal processor; the signal amplifier is used for amplifying the induction signals received by the induction signal collecting module; and the signal processor analyzes the amplified induction signal to identify the interactive operation.

In some embodiments, the shading enclosure barriers are arranged independently, and each shading enclosure barrier is arranged around one LED lamp bead or one photosensitive device.

In some embodiments, the light shielding enclosure is in a shape of a strip which is criss-cross, a plurality of light shielding areas which are arranged in an array are formed, and one LED lamp bead or a photosensitive device is arranged in one light shielding area.

In some embodiments, a second packaging layer is further disposed on the second end face of the circuit board, and the second packaging layer is disposed to cover the display driving chip.

The application further discloses a display screen, which comprises a plurality of COB display modules, wherein the plurality of COB display modules are spliced to form the LED display screen; COB display module assembly be the COB display module assembly that has interactive function of aforesaid any one embodiment.

The embodiment of this application provides still that COB display module assembly's preparation method with interactive function in addition, includes:

preparing a circuit board;

installing an LED lamp bead and a photosensitive device on a first end face of the circuit board;

optical lenses are arranged on the LED lamp beads and the photosensitive devices;

generating a shading enclosure between the LED lamp bead and the photosensitive device according to a preset pattern of the shading enclosure;

generating a first packaging layer on a first end face of the circuit board, wherein the packaging layer covers the LED lamp beads and the photosensitive device;

and a drive control chip is fixed on the second end face of the circuit board and is electrically connected with the circuit board.

According to the COB display module with the interaction function, the LED lamp beads and the photosensitive devices are arranged on the circuit board in an array mode, the photosensitive devices are connected to form the photoelectric conversion array, the positions of interaction operation are identified by identifying the change conditions and the positions of sensing signals generated by the photosensitive devices to external incident light, and then interaction operation between a user and the COB display module is achieved; the LED lamp beads and the photosensitive devices are respectively and correspondingly provided with the optical lenses, and the light-isolating enclosure is arranged between the LED lamp beads and the photosensitive devices at intervals, so that external light can conveniently enter the photosensitive devices, light emitted by the LED lamp beads is emitted out of the first packaging layer, and interference of the light emitted by the LED lamp beads on the photosensitive devices can be avoided. For current scheme of installing additional touch-control equipment on the display screen, the COB display module that this application embodiment provided sets up photosensitive element through the array on the circuit board and realizes interactive operation, need not design wide big frame, and the overall dimension is smaller, also need not design extra mounting structure, simple structure, easy installation.

Drawings

Fig. 1 is a schematic structural view of a COB display module according to an embodiment of the present disclosure at a front view angle;

fig. 2 is a schematic cross-sectional view illustrating a COB display module according to an embodiment of the present disclosure; (ii) a

Fig. 3 is a schematic cross-sectional view illustrating a COB display module according to another embodiment of the present disclosure;

fig. 4 is a schematic circuit diagram of a photoelectric conversion array according to an embodiment of the present application;

FIG. 5 is a schematic view of an exemplary light-shielding enclosure pattern of the present application;

FIG. 6 is a schematic view of a light-blocking enclosure design according to another embodiment of the present application;

FIG. 7 is a schematic illustration of a light blocking enclosure design according to yet another embodiment of the present application;

FIG. 8 is a schematic view of a light-shielding enclosure pattern according to yet another embodiment of the present application;

FIG. 9 is a schematic structural diagram of a display screen according to an embodiment of the present application;

fig. 10 is a schematic flowchart illustrating a manufacturing method of a COB display module according to an embodiment of the present disclosure;

fig. 11 is a schematic process flow diagram of a manufacturing method of a COB display module according to an embodiment of the present application.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, 2 and 4, an embodiment of the present application discloses a COB display module 10 with an interactive function, which includes a circuit board 100, an LED lamp bead 200, a photosensitive device 300, a light-shielding enclosure 400, a packaging layer 500, an optical lens 600, and at least one display driver chip 800;

the circuit board 100 has first and second

opposing end faces

100a, 100 b; the LED lamp beads 200 are arranged on the first end face 100a in an array mode, and the display driving chip 800 is arranged on the second end face 100 b; the display driving chip 800 is electrically connected with the LED lamp bead 200 through a circuit in the circuit board 100 and controls the LED lamp bead 200 to work;

the array of photosensitive devices 300 is arranged on the first end face 100a of the circuit board 100, and all the photosensitive devices 300 are connected to form a photoelectric conversion array;

each LED lamp bead 200 and each photosensitive device 300 are correspondingly provided with an optical lens 600;

the shading enclosure 400 is arranged between the LED lamp bead 200 and the photosensitive device 300 and is used for blocking light rays emitted by the LED lamp bead 200 from entering the photosensitive device 300;

the first encapsulation layer 300 covers the optical lens 600 and the light-shielding enclosure 400;

a photosensor 300 for sensing the intensity of external light to generate a sensing signal; when the interactive operation is performed, the sensing signal generated by the photosensitive device 300 at the interactive operation position changes beyond a preset range; the position of the interactive operation on the COB display module can be identified by collecting and analyzing the variation and the position of the sensing signal of the photosensitive device 300 in the photoelectric conversion array.

The first encapsulation layer 300, which is made of a transparent encapsulation material, provides protection for the optical lens 600, the photosensitive device 300, and the light-shielding enclosure 400, and allows light to enter and exit. For example, the first encapsulation layer 300 may use common LED encapsulation glue such as silicone, epoxy, and glue cake.

The array of LED beads 200 is disposed on the first end surface 100a of the circuit board 100 to form a display surface. The LED lamp beads 200 can be single-color LED lamp beads or composite lamp beads. For example, when the LED lamp bead 200 is a single-color LED lamp bead, the COB display module 10 may be provided with a plurality of colors of LED lamp beads 200 to form a full-color display. For example, as shown in fig. 3, the LED lamp bead 200 is a composite lamp bead, and may include a red LED chip R, a green LED chip B, and a blue LED chip G. It can be understood that, in the composite lamp bead, a combination of LED chips of other colors may also be used, and one or more of a white LED chip, a yellow LED chip, or a cyan LED chip may also be further included.

And the LED lamp beads 200 and the photosensitive devices 300 are both provided with optical lenses 600. The optical lens 600 can distribute the light emitted by the LED lamp beads 200, so that the light-emitting effect observed from the outside is more uniform; and may also assist in the incidence of external light into the photosensitive device 300. The optical lens 600 may be one of a common glass lens, a plastic lens (such as an acrylic lens, a PC lens, etc.), a silicone lens, and the like.

Be provided with the shading between LED lamp pearl 200 and photosensitive device 300 and enclose fender 400, the shading encloses fender 400, chooses for use lightproof material can. In order to ensure the shading effect, the height of the shading enclosure 400 needs to be larger than that of the LED lamp bead 200.

The photosensitive device 300 may use a common photoelectric conversion device, such as a MOS capacitor, an avalanche photodiode, a photoresistor, a triode, or the like. The induced signal generated by different types of photosensitive devices has different expression forms, namely one of electric signals such as charge, current, voltage and the like. Illustratively, when the photosensitive device 300 employs a MOS capacitor, the induced signal is an electric charge. If an avalanche photodiode, a photoresistor and a triode photoelectric tube are adopted, the induction signal is current. For the photoresistor, the resistance value of the photoresistor is influenced by input light, and the change of the resistance value can be converted into a sensing signal in a current form by applying preset voltage to two ends of the photoresistor.

As shown in fig. 4, the photosensitive devices 300 are arrayed on the first end surface 100a of the circuit board 100 to form a photoelectric conversion array. The photosensor 300 in the photoelectric conversion array completely covers the first end face 100a of the circuit board 100. When the COB display module 10 is in normal display operation, the photosensor 300 receives external incident light normally, so as to generate a sensing signal with a certain size. When there is an interactive operation, for example, at the position of (i +1 row, j +2 column), the user performs a touch operation with a finger or a touch pen, and the amount of light entering the photosensitive device 300 is reduced because of being shielded, and accordingly, the value of the sensing electrical signal is also changed — the sensing signal is reduced. A preset range of the variation of the sensing signal may be set in advance, and when the reduction value of the sensing signal exceeds the preset range, it may be determined that there is an interactive operation at the position of the photosensitive device 300 corresponding to the sensing signal.

It will be appreciated that interactive operation, as well as interactive devices such as laser pointers, may be used which may produce a bright light. The difference from the previous solution is that, at this time, the light incident into the photosensitive device 300 increases due to the strong light, and the value of the sensing signal increases instead of decreasing as described above. The preset range of the change of the induction signal can be set with an upper limit value, and when the added value of the induction signal exceeds the preset range, the interactive operation of the corresponding position is judged.

In some embodiments, the COB display module 10 may further include a touch scan driving module 710 and an induction signal collecting module 720; each photosensitive device 300 has a first end and a second end, and the first ends of the photosensitive devices 300 in the same row in the photoelectric conversion array are connected with the sensing signal collecting module 720 through a line in the circuit board 100; the second ends of the photosensitive devices 300 in the same column are connected with the touch scanning driving module 710 through the circuit in the circuit board 100; the touch scan driving module 710 provides a touch scan signal; the photosensor 300 receives the touch scan signal, senses external light, generates a sensing signal, and outputs the sensing signal to the sensing signal collecting module 720, and the sensing signal collecting module 720 receives all sensing signals output by the photoelectric conversion array.

The touch scan driving module 710 may be provided with a plurality of scan channels, and each scan channel is correspondingly connected to the second end of one column of photosensitive devices 300. The touch scan driving module 710 outputs a touch scan signal through each scan channel, and at the same time, only one scan channel is turned on, i.e. only the second end of one row of photosensitive devices 300 is turned on by a driving voltage. The light sensor 300 may sense and generate a corresponding sensing signal according to the received external light.

The sensing signal collecting module 720 may be provided with a plurality of signal receiving channels respectively connected to the first ends of the photosensitive devices 300 of each row. And the position of the sensing signal in the photoelectric conversion array can be determined by combining the signal receiving channel position of the received sensing signal and the touch scanning signal. By analyzing the sensing signal, the position where the external input light changes, namely the position where the interactive operation is located, can be identified, and then the interactive operation can be executed by combining the display content at the position in the display picture.

Further, as shown in fig. 4, the COB display module 10 may further include a signal amplifier 730 and a signal processor 740; the signal amplifier 730 is configured to amplify the sensing signal received by the sensing signal collecting module 720; the signal processor 740 analyzes the amplified sensing signal to recognize the interactive operation.

In some embodiments, an optical colloid may be further filled between the optical lens 600 and the LED lamp bead 200 and the photosensitive device 300, and a difference between a reflection coefficient of the optical colloid and a reflection coefficient of the optical lens 600 is within a preset difference range. The optical colloid can be made of transparent material. The preset difference range of the reflection coefficients can be preset, and the purpose of the preset difference range is to ensure that the reflection coefficients of the optical colloid are relatively close to the reflection coefficients of the optical lens 600.

Preferably, the optical colloid has the same reflectance as that of the optical lens 600. By filling the optical colloid, the reflection loss of light at the interface of the optical lens 600 can be reduced, and the projection ratio of light can be increased.

In some embodiments, an antireflection film layer may be further disposed on the optical lens 600 disposed corresponding to the photosensitive device 300. Common antireflection films can be selected for the antireflection film layer, such as zirconium dioxide, titanium dioxide, porous silicon dioxide, silicon nitride and the like. By providing an anti-reflection film layer, the reflected light on the surface of the optical lens 600 can be reduced, and the light entering the photosensitive device 300 can be increased.

In some embodiments, as shown in fig. 1, a second encapsulation layer 900 may be further disposed on the second end surface 100b of the circuit board 100 to cover the display driving chip 800, the touch scanning driving module 710, and the sensing signal collecting module 720, so as to protect the display driving chip 800, the touch scanning driving module 710, and the sensing signal collecting module 720. The second package layer 900 may be made of a material with a certain thermal conductivity, so as to provide protection and also help the display driver chip 800, the touch scan driver module 710, and the sensing signal collection module 720 to dissipate heat.

As shown in fig. 1, the photosensors 300 may be disposed in one-to-one correspondence with the LED beads 200. As shown in fig. 7, a plurality of photosensitive devices 300 may be disposed corresponding to one LED lamp bead 200.

As shown in fig. 1, the light-shielding enclosure 400 may be disposed around only the photosensitive device 300. As shown in fig. 7, the light-shielding enclosure 400 may also be disposed around the LED lamp bead 200. In this case, the light-shielding barriers 400 may be independent from each other. The light-shielding enclosure 400 may be circular, square, and any other shape.

In some embodiments, as shown in fig. 5, the light-shielding enclosure 400 may be in the shape of a linear strip and is disposed between a row of LED beads 200 and a row of photosensors 300. Thus, the light-shielding enclosure 400 can be conveniently prepared.

Further, as shown in fig. 6 and 8, the light-shielding enclosure 400 may be a linear strip shape arranged in a criss-cross manner, so as to form a plurality of light-shielding regions arranged in an array, and one LED lamp bead 200 or photosensitive device 300 is arranged in one light-shielding region.

Further, when the distance between the LED beads 200 in the COB display module 10 is relatively small, in order to reduce the usage amount of the photosensitive device 300 and reduce the cost, as shown in fig. 8, only a part of the light blocking region is provided with the LED beads 200 or the photosensitive device 300. For example, as shown in fig. 8, a part of the light blocking region between the photosensors 300 may be partially left empty, and no LED lamp bead or photosensor is disposed.

Another embodiment of the application further discloses a display screen, as shown in fig. 9, the display screen includes a plurality of COB display modules 10, and the plurality of COB display modules 10 are spliced to form the display screen; the COB display module assembly 10 is the interactive COB display module assembly of any preceding embodiment.

Because the COB display module assembly in the preceding embodiment has been adopted, consequently, the display screen that the concatenation formed also has interactive function to need not design the frame of wideness, the whole size is smaller, also need not to design extra mounting structure, simple structure, easy installation.

In some embodiments, the display screen may further include an interaction control unit, configured to acquire induced charges output by the photoelectric conversion arrays on all the COB display modules, and perform analysis to identify the interaction operation position. At this time, on the COB display module 10, the interactive control unit may not be provided.

In some embodiments, the display screen further includes braced frame 20, and COB display module assembly 10 is installed on braced frame 20, and braced frame 20 provides structural support for COB display module assembly 10 to the structural strength of reinforcing display screen ensures COB display module assembly 10's concatenation effect, the guarantee display quality.

The display screen may further include a power supply unit for receiving an input external power and converting the input external power into an operating voltage required by the COB display module 10. For example, the external power source may be an alternating current, such as 220V alternating current, 110V alternating current, 100V alternating current, 48V alternating current, or the like; or may be a direct current, such as 12V direct current, 5V direct current, or the like.

The display screen can also comprise a plurality of receiving cards, and each receiving card corresponds to at least one COB display module; and the receiving card is used for receiving video data input from the outside, intercepting picture data of a corresponding area of the connected COB display module, and outputting the picture data to the corresponding COB display module for display.

Another embodiment of the present application further discloses a method for manufacturing an interactive COB display module, as shown in fig. 10 and 11, including:

s100, preparing a circuit board;

s200, installing an LED lamp bead and a photosensitive device on the first end face of the circuit board;

the circuit board 100 is internally provided with a connection line. As shown in fig. 4, the circuit board 100 is provided with a first end face 100a and a second end face 100b opposite to each other, and a metal pad may be provided on the first end face 100 a. The LED lamp bead 200 and the photosensitive device 300 can be fixed on the metal pad by welding to realize the fixation and the electrical connection with the circuit board 100.

In some embodiments, a die attach area may be further disposed on the first end surface 100a of the circuit board 100 for attaching the LED lamp bead 200. At this time, the LED lamp bead 200 may be electrically connected to the circuit board 100 in a key line manner.

It can be understood that when the flip-chip LED lamp bead is adopted, the LED lamp bead 200 is fixed in the die bonding area, and the electrical connection between the LED lamp bead 200 and the circuit board 100 can also be realized.

S300, mounting optical lenses on the LED lamp beads and the photosensitive devices;

the optical lens 600 may be one of a common glass lens, a plastic lens (such as an acrylic lens, a PC lens, etc.), a silicone lens, and the like. Different mounting processes may be employed depending on the type of optical lens selected.

For example, when a silicone lens is selected, the optical lens may be mounted by reflow soldering. When plastic lenses such as acrylic lenses, PC lenses and the like are selected, an injection molding process can be adopted to complete the installation of the optical lenses.

S400, generating a shading enclosure between the LED lamp bead and the photosensitive device according to a preset shading enclosure pattern;

as shown in fig. 1 and 5-8, the light-shielding enclosure can exhibit various pattern effects. The pattern of the shading enclosure can be preset, the mould is combined, and the shading enclosure 400 corresponding to the pattern is generated between the LED lamp bead and the photosensitive device by adopting an injection molding process. In order to ensure the shading effect, the height of the shading enclosure 400 needs to be larger than that of the LED lamp bead 200.

S500, generating a first packaging layer on a first end face of the circuit board, wherein the packaging layer covers the LED lamp beads and the photosensitive device;

the first packaging layer 500 is made of transparent packaging materials, and the LED lamp beads 200 and the photosensitive devices 300 are protected while light is allowed to enter and emit. The first encapsulation layer 500 may be formed by a coating process or an injection molding process.

S600, fixing a drive control chip on the second end face of the circuit board, and electrically connecting the drive control chip with the circuit board;

a plurality of pads may be disposed on the second end surface 100b of the circuit board 100, and the driving control chip may be fixed on the second end surface 100b by soldering, so as to electrically connect the driving control chip and the circuit board 100.

The driving control chip at least includes a display driving chip 800. The display driving chip 800 is electrically connected with the LED lamp bead 200 through a circuit in the circuit board 100, and controls the operating state of the LED lamp bead 200.

In some embodiments, the driving control chip may further include a touch scan driving module 710, a sensing signal collecting module 720, a signal amplifier 730, and a signal processor 740. The specific working modes of the above embodiments can be referred to, and are not described herein.

In some embodiments, the method for manufacturing a COB display module further includes:

and S700, generating a second packaging layer on the second end face of the circuit board.

The second packaging layer 900 covers the display driver chip 800, the touch scan driver module 710, and the sensing signal collection module 720, so as to protect the display driver chip 800, the touch scan driver module 710, and the sensing signal collection module 720. The second encapsulation layer 900 may be formed by a coating process or an injection molding process.

The second package layer 900 may be made of a material with a certain thermal conductivity, so as to provide protection and also help the display driver chip 800, the touch scan driver module 710, and the sensing signal collection module 720 to dissipate heat.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A COB display module with an interactive function is characterized by comprising a circuit board, an LED lamp bead, a photosensitive device, a shading enclosure, a packaging layer, an optical lens and at least one display driving chip;

the first packaging layer covers the optical lens and the shading enclosure;

2. The COB display module assembly of claim 1, wherein the height that the shading encloses the fender is greater than the height of LED lamp pearl.

3. The COB display module assembly according to claim 1, wherein an optical colloid is filled between the optical lens and the LED lamp beads and between the optical lens and the photosensor, and the difference between the reflection coefficient of the optical colloid and the reflection coefficient of the optical lens is within a preset difference range.

4. The COB display module assembly of claim 1, further comprising a touch scan driver module and an inductive signal collection module; each photosensitive device is provided with a first end and a second end, and the first ends of the photosensitive devices in the same row in the photoelectric conversion array are connected with the induction signal collecting module through a circuit in the circuit board; the second ends of the photosensitive devices in the same column are connected with the touch scanning driving module through the circuit in the circuit board; the touch scanning driving module provides a touch scanning signal; the photosensitive device receives a touch scanning signal, senses external light, generates a sensing signal and outputs the sensing signal to the sensing signal collection module; the sensing signal collection module receives all sensing signals output by the photoelectric conversion array.

5. The COB display module of claim 4, further comprising a signal amplifier and a signal processor; the signal amplifier is used for amplifying the induction signals received by the induction signal collecting module; and the signal processor analyzes the amplified induction signal to identify the interactive operation.

6. The COB display module assembly of claim 1, wherein the shading encloses and keeps off mutual independence setting between the fender, and every shading encloses to keep off and encircles a LED lamp pearl or photosensitive device setting.

7. The COB display module assembly of claim 1, wherein the shading enclosure is in the shape of a strip which is crossed vertically and horizontally to form a plurality of light-blocking areas which are arranged in an array, and one of the light-blocking areas is internally provided with one LED lamp bead or one photosensitive device.

8. The COB display module assembly of claim 1, wherein a second encapsulation layer is further disposed on the second end face of the circuit board, and the second encapsulation layer is disposed to cover the display driving chip.

9. A display screen comprises a plurality of COB display modules, wherein the COB display modules are spliced to form an LED display screen; characterized in that, COB display module assembly is the COB display module assembly that has interactive function of any one of claims 1-8.

10. The utility model provides a preparation method of COB display module assembly with interactive function which characterized in that includes:

preparing a circuit board;