CN209859505U

CN209859505U - Flexible LED display screen

Info

Publication number: CN209859505U
Application number: CN201920491628.4U
Authority: CN
Inventors: 周全; 胡航; 罗鸿飞
Original assignee: Nanjing Das Digital Technology Co Ltd
Current assignee: Nanjing Das Digital Technology Co Ltd
Priority date: 2019-04-12
Filing date: 2019-04-12
Publication date: 2019-12-27
Anticipated expiration: 2029-04-12

Abstract

The utility model provides a flexible LED display screen, include: the LED unit comprises a driving chip and an LED lamp wick, wherein the driving chip and the LED lamp wick are connected in series through a serial signal wire and are fixed on the flexible substrate through a COB (chip on Board) process; the driving chip is provided with 2 serial input ends and 1 serial output end. The utility model provides a flexible LED display screen has reduced the pixel interval and can effectively avoid the disconnection of serial signal line, and flexible substrate makes the display screen application scene more nimble, brings better display effect.

Description

Flexible LED display screen

Technical Field

The utility model relates to a show technical field, concretely relates to flexible LED display screen of COB encapsulation.

Background

Traditional display screen encapsulates LED wick and driver chip in advance and then welds on the PCB board, and the material of PCB board lets the difficult nimble application of display screen in the demonstration scene of difference, and the shell of encapsulation has taken the space moreover, can lead to the pixel interval too big, and the display effect is unsatisfactory.

Therefore, a new display screen is required to replace the conventional display screen.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a flexible LED display screen, which is used for solving the problems that the application scene of the traditional display screen is not flexible and the display effect is not ideal.

In order to achieve the above object, the present application provides the following technical solutions:

in a first aspect: the application provides a flexible LED display screen, flexible LED display screen includes: the LED lamp comprises a flexible substrate and a plurality of LED units, wherein each LED unit comprises a driving chip and an LED lamp wick, and the driving chip and the LED lamp wick are connected and fixed on the flexible substrate through a COB (chip on Board) process.

The display screen of above-mentioned scheme design, through with driver chip and LED wick directly through COB's technology encapsulation on flexible substrate, removed the casing that traditional LED lamp encapsulation was used, reduced the pixel interval, adopt flexible substrate to replace traditional PCB board simultaneously for the display screen is applied the scene and is abundanter, and flexible substrate still can adopt transparent material, and display effect compares traditional display screen and has apparent progress.

In an optional embodiment of the first aspect, the flexible substrate includes an etched circuit and a pad for fixing the LED wick and the driving chip.

In an optional implementation manner of the first aspect, the driver chip includes 2 serial input terminals and 1 serial output terminal, the serial input terminals are respectively connected to the upper driver chip and the upper driver chip, and the serial output terminals are connected to the lower driver chip and the lower driver chip.

In the display screen designed by the scheme, each drive chip receives the output signals of the upper drive chip and the upper drive chip, so that in the working process of the display screen, even if one drive chip is in an open circuit state, the lower drive chip of the open circuit drive chip can continue to work by receiving the output signals of the upper drive chip.

In an alternative embodiment of the first aspect, the LED wick comprises a red chip, a green chip, and a blue chip.

In an alternative embodiment of the first aspect, a protective transparent substance is encapsulated around the LED unit.

The transparent substance may be selected from epoxy resin or silicone,

in an optional implementation of the first aspect, the LED unit further comprises a decoupling capacitor.

In an optional embodiment of the first aspect, the LED unit further comprises a resistor for adjusting a current of the driving chip, and the resistor is connected to the driving chip.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. The foregoing and other objects, features and advantages of the application will be apparent from the accompanying drawings. Like reference numerals refer to like parts throughout the drawings. The drawings are not intended to be to scale as practical, emphasis instead being placed upon illustrating the subject matter of the present application.

Fig. 1 is a schematic view of an LED unit provided in a first embodiment of the present invention;

fig. 2 is a schematic connection diagram of a driving chip according to a first embodiment of the present invention;

fig. 3 is a schematic view of a flexible screen according to a first embodiment of the present invention.

Icon: 11-a driving chip; 12-LED lamp wick; 121-blue chip; 122-green chip; 123-red chip; 21-GND pad; 22-VCC pad; 3-a flexible substrate.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

In the description of the present application, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 3, the present application provides a flexible LED display screen, comprising: a flexible substrate 3 and a plurality of LED units. As shown in fig. 1, the LED unit includes a driving chip 11 and an LED wick 12, and the driving chip 11 and the LED wick 12 are connected and fixed on a flexible substrate by a COB process. COB's packaging technology, conventional selection has two kinds of technologies of just installing and flip-chip, and what figure 1 provided is the schematic diagram of LED unit 12 under the mode of just installing, and the shell of traditional LED encapsulation has been removed to this embodiment for LED unit volume is smaller, has reduced the distance between the pixel, brings better display effect. When the normal installation mode is adopted, the LED lamp core 12, the driving chip 11 and the circuit board on the flexible substrate 3 are mutually connected by gold wires or aluminum wires; when the flip-chip manner is adopted, the driving chip 11 is directly connected to the circuit board on the flexible substrate 3, and the LED chip 12 and the driving chip 11 are connected through the wiring on the circuit board. Flexible substrate 3 adopts flexible macromolecular materials such as PET, PEN, compares the PCB material more lightly, and the pliability is higher, and according to the use occasion, flexible substrate material can be transparent or non-transparent, and transparent material possesses better display effect. The flexible LED display screen can increase the stickness material at the light emitting surface back, adheres to and shows on other surfaces, also can increase optical transparent adhesive (OCA) at the light emitting surface to adhere to and show on transparent surface, the display effect is good, and the application scene is more nimble.

In an optional implementation manner of this embodiment, the flexible substrate further includes an etching circuit and a bonding pad for fixing the LED wick and the driving chip. As shown in fig. 1, at the bottom of the driver chip 11, a GND pad 21 is connected; the bottom of the LED lamp wick 12 is connected with a VCC bonding pad 12, and the driving chip 11 and the LED lamp wick 12 are fixed on the flexible substrate 3 by the bonding pad.

In an alternative embodiment of this embodiment, as shown in fig. 2, the driving chip 11 includes 2 serial input terminals and 1 serial output terminal, the serial input terminals are respectively connected to the upper driving chip and the upper driving chip, and the serial output terminals are connected to the lower driving chip and the lower driving chip.

In the flexible LED display screen designed by the scheme, 2 serial input ends of each driving chip respectively receive output signals transmitted by a higher driving chip and an upper driving chip, and a lower driving chip are connected to the output end of the higher driving chip in a parallel connection mode. When the lower chip is disconnected, the output signal can skip the damaged lower driver chip and is directly transmitted to the lower driver chip, so that the problem of disconnection of the serial signal line is effectively solved.

In an alternative embodiment of this embodiment, as shown in fig. 1, the LED wick 12 includes a red chip 123, a green chip 122, and a blue chip 121.

In an alternative embodiment of this embodiment, a protective transparent substance is encapsulated around the LED unit 12.

In the LED display screen designed by the scheme, transparent substances such as epoxy resin or silica gel are packaged around the LED unit 12, so that damage can be effectively avoided, and richer display scene requirements are met.

In an alternative embodiment of this embodiment, the LED unit further comprises a decoupling capacitor.

In the LED display screen designed by the scheme, the LED unit 12 and the decoupling capacitor are packaged together, so that power supply ripples and electromagnetic radiation can be effectively reduced, and a good anti-interference effect is achieved.

In an optional implementation manner of this embodiment, the LED unit 12 further includes a resistor for adjusting the current of the driving chip, and the resistor is connected to the driving chip 11.

Claims

1. The utility model provides a flexible LED display screen which characterized in that: comprising a flexible substrate and a plurality of LED units,

the LED unit includes driver chip and LED wick, driver chip and LED wick connection are fixed on flexible substrate through the COB technology, every driver chip corresponds the drive and is a set ofly the LED wick, driver chip contains 2 serial input and 1 serial output, serial input is connected with higher level and the last driver chip of higher level respectively, serial output and subordinate reach subordinate's driver chip and be connected.

2. The flexible LED display screen of claim 1, wherein: the flexible substrate comprises an etching circuit and a bonding pad used for fixing the driving chip and the LED lamp wick.

3. The flexible LED display screen of claim 1, wherein: the LED lamp wick comprises a red chip, a green chip and a blue chip.

4. The flexible LED display screen of claim 1, wherein: transparent substances for protection are packaged around the LED units.

5. The flexible LED display screen of claim 1, wherein: the LED cell includes a decoupling capacitor.

6. The flexible LED display screen of claim 1, wherein: the LED unit comprises a resistor used for adjusting the current of the driving chip, and the resistor is connected with the driving chip.