WO2023020562A1

WO2023020562A1 - Bare lamp bead and led display screen

Info

Publication number: WO2023020562A1
Application number: PCT/CN2022/113198
Authority: WO
Inventors: 林谊
Original assignee: 深圳市晶泓科技有限公司
Priority date: 2021-08-19
Filing date: 2022-08-18
Publication date: 2023-02-23
Also published as: CN115713899A

Abstract

A bare lamp bead (2) and an LED display screen. The bare lamp bead (2) comprises a driver chip (21) and a light-emitting wafer (20). The light-emitting wafer (20) is mounted on the driver chip (21); and a pair of power source pins (212, 213), a pair of signal pins (211) and a pair of short-circuit pins (214) are arranged on the driver chip (21). The short-circuit pins (214) comprise a first short-circuit pin and a second short-circuit pin, wherein the first short-circuit pin and the second short-circuit pins are short-circuited; and a control signal controlling the turning-on and turning-off of the light-emitting wafer (20) does not pass through an internal circuit of the driver chip (21) and is transmitted to the next bare lamp bead (2).

Description

A bare lamp bead and LED display

This application claims the priority of the Chinese patent application with the application number 202110955671.3 submitted to the China Patent Office on August 19, 2021, and the title of the invention is "a bare lamp bead and LED display screen", the entire content of which is incorporated herein by reference. Applying.

technical field

The application relates to the field of LED displays, in particular to the field of transparent LED display screens.

Background technique

LED display screens have gradually been widely used in the market, and various product forms have been developed. Existing LED displays generally include a substrate and arrays of LED lamp beads distributed on the substrate. As shown in FIG. And the light-emitting chip 20'; Generally, there are pins 23' drawn out from the shell 22', and the pins 23' are used to be installed on the substrate.

As shown in Figure 2, the existing LED display screen generally consists of a plurality of LED lamp beads 2' (such as one row or column, or multiple rows or columns) connected end to end in series to form a lamp bead string, and the LED display screen consists of Composed of multiple lamp bead strings. During the research and development process, the applicant found that at present, limited by the objective fact of signal attenuation during signal transmission, the traditional LED lamp beads 2' are connected in series, and the display effect will decrease if too many are connected in series. Ideally, generally, the number of LED lamp beads 2' connected in series in one lamp bead string will be controlled within a specific range. This method of control limits the size of the LED display, and cannot increase the size of the LED display.

application content

In order to overcome the problem in the prior art that the size of the LED display screen cannot be enlarged due to the string acceptance limit of the lamp bead string formed by connecting LED lamp beads in series, this application provides a bare lamp bead and an LED display screen.

One aspect of the present application provides a bare lamp bead, the bare lamp bead includes a driving chip and a light emitting chip; the light emitting chip is installed on the driving chip;

The drive chip is provided with a pair of power supply pins, a pair of signal pins and a pair of short-circuit pins;

The signal pins include a first signal pin and a second signal pin, and the internal circuit of the driver chip is passed between the first signal pin and the second signal pin to control the brightness of the light-emitting chip. The control signal for turning off passes through the internal circuit of the driver chip and is transmitted to the next bare lamp bead;

The shorting pins include a first shorting pin and a second shorting pin; the first shorting pin and the second shorting pin are shorted to control the light-emitting chip to turn on and off The control signal does not pass through the internal circuit of the driver chip, and is transmitted to the next bare lamp bead.

The bare lamp bead provided by the present application adopts a shell-less structure, so the size of the bare lamp bead can be reduced. Set a pair of signal pins and a pair of short-circuit pins directly on its driver chip, so that its bare lamp beads can receive two sets of control signals, and when one set of control signals is input and output from the signal pins, the control signals will pass through The internal circuit of the drive chip controls the light-emitting chip to turn on and off, and transmits it to the next bare lamp bead; while another set of control signals is input and output through the short-circuit pin, the control signal does not pass through the internal circuit of the drive chip, but It is passed directly to the next bare lamp bead. In this way, when such bare lamp beads are connected in series to form a lamp bead string, two sets of control signals are activated in the lamp bead string at intervals and transmitted at intervals in the bare lamp bead string. This method can effectively lengthen the length of the lamp bead string, so that when it is applied to the LED display screen, the size of the LED display screen can be enlarged.

In the bare lamp bead mentioned above in the present application, the bare lamp bead is a two-way transmission bare lamp bead.

In the bare lamp bead described above in the present application, color pins are provided on the bare lamp bead, and the color pins are respectively electrically connected to the light-emitting chip.

In the above-mentioned bare lamp bead of the present application, the light-emitting chip is mounted on the driving chip by means of CSP or COC.

Another aspect of the present application provides an LED display screen, including a substrate and bare lamp beads; a circuit pattern is arranged on the substrate; an array of the bare lamp beads is arranged on the substrate;

The circuit pattern includes a power supply pad, a signal pad and a power supply line; the power supply line includes a number of first power supply lines and second power supply lines with opposite polarities; the power supply pad connects the first power supply line and the the second power supply line;

The bare lamp bead includes a driver chip and a light-emitting chip; the light-emitting chip is mounted on the driver chip;

The driver chip is provided with more than one pair of power supply pins, a pair of signal pins and a pair of short-circuit pins;

The power supply pins include a first power supply pin and a second power supply pin; the first power supply pin is directly or indirectly connected to the first power supply line, and the second power supply pin is directly or indirectly connected to the the second power supply line;

The signal pins include a first signal pin and a second signal pin, and the internal circuit of the driver chip is passed between the first signal pin and the second signal pin; The control signal for turning off passes through the internal circuit of the driver chip and is transmitted to the next bare lamp bead;

The shorting pins include a first shorting pin and a second shorting pin; shorting between the first shorting pin and the second shorting pin; controlling the light-emitting chip to turn on and off The control signal does not pass through the internal circuit of the driver chip, and is transmitted to the next bare lamp bead;

A number of bare lamp beads are connected in series to form a lamp bead string, and each of the lamp bead strings is correspondingly provided with two of the signal pads, which are respectively called the first signal pad and the second signal pad;

In the lamp bead string, the signal pin of the input signal of the first bare lamp bead is connected to the first signal pad, and the short-circuit pin of the input signal of the first bare lamp bead is connected to the second signal pad; or, the signal pin of the input signal of the first bare lamp bead is connected to the second signal pad, and the shorting pin of the input signal of the first bare lamp bead is connected to the first signal Pad;

The signal pins of the input signals of the other bare lamp beads are connected to the short-circuit pins of the output signals of the previous bare lamp beads, and the short-circuit pins of the input signals of each of the bare lamp beads are connected to the previous bare lamp beads. The signal pin of the output signal of each bare lamp bead; the signal pin of the output signal of each bare lamp bead is connected to the short-circuit pin of the input signal of the next bare lamp bead, and the short-circuit pin of the output signal of each bare lamp bead is connected to The signal pin of the input signal of the last bare lamp bead.

The LED display screen disclosed in the present application can reduce the size of the bare lamp beads because the bare lamp beads arranged in an array adopt a shell-less structure. Set a pair of signal pins and a pair of short-circuit pins directly on its driver chip, so that its bare lamp beads can receive two sets of control signals, and when one set of control signals is input and output from the signal pins, the control signals will pass through The internal circuit of the drive chip controls the light-emitting chip to turn on and off, and transmits it to the next bare lamp bead; while another set of control signals is input and output through the short-circuit pin, the control signal does not pass through the internal circuit of the drive chip, but It is passed directly to the next bare lamp bead. Each bare lamp bead is not only connected to the control signal output by the second upstream bare lamp bead and works, but also is the signal transmission medium of the previous bare lamp bead, and the control signal of the previous bare lamp bead does not pass through this The naked lamp bead is passed directly to the next bare lamp bead. In this way, when such bare lamp beads are connected in series to form a lamp bead string, two sets of control signals are activated in the lamp bead string at intervals and transmitted at intervals in the bare lamp bead string. This method can effectively lengthen the length of the lamp bead string, so that when it is applied to the LED display screen, the size of the LED display screen can be enlarged.

In the aforementioned LED display screen of the present application, the substrate is a transparent substrate. At this time, the LED display is a transparent LED display.

In the above-mentioned LED display screen of the present application, the bare lamp bead is bonded and connected to the transparent substrate by means of COG.

In the above-mentioned LED display screen of the present application, the transparent substrate on which the bare lamp beads are arranged is provided with a glue filling layer, and the glue filling layer encapsulates each of the bare lamp beads therein; the upper surface of the glue filling layer With protective cover.

In the above-mentioned LED display screen of the present application, the bare lamp bead is bound and connected to the signal pad, or the shorting pad, or the bare lamp bead before and after it through a signal jumper.

In the above-mentioned LED display screen of the present application, the power supply lines include a plurality of the first power supply lines and the second power supply lines arranged at intervals in rows or columns; the first power supply lines and the second power supply lines There are several rows or columns of the bare lamp beads; the bare lamp beads share the first power supply line and the second power supply line.

In the above-mentioned LED display screen of the present application, the first power supply pin on each bare lamp bead is bound and connected to the first power supply line or the first power supply pin on the adjacent bare lamp bead through a power jumper; The second power pin on the bare lamp bead is bound and connected to the second power supply line or the second power pin on the adjacent bare lamp bead through a power jumper; so that each bare lamp bead can be directly taken from the power supply line. electricity, or take electricity from its adjacent bare lamp beads.

In the above-mentioned LED display screen of the present application, the diameters of the power jumper and the signal jumper are 15 μm-70 μm.

Description of drawings

Fig. 1 is a three-dimensional partial cross-sectional schematic diagram of an LED lamp bead disclosed in the prior art;

Fig. 2 is a schematic diagram of a LED lamp bead string disclosed in the prior art;

Fig. 3 is a three-dimensional schematic diagram of a bare lamp bead provided in the specific embodiment of the present application;

Fig. 4 is a schematic top view of a bare lamp bead provided in the specific embodiment of the present application;

Fig. 5 is a schematic cross-sectional view of a transparent LED display provided with bare lamp beads in Fig. 3 and Fig. 4 provided in the specific embodiment of the present application;

Fig. 6 is a schematic cross-sectional view of a transparent LED display provided with bare lamp beads in Fig. 3 and Fig. 4 provided in the specific embodiment of the present application;

Fig. 7 is a schematic top view of another transparent LED display provided in the specific embodiment of the present application.

Reference signs in the background technology are as follows: 2', LED lamp bead; 20', light-emitting chip; 21', driver chip; 22', shell; 23', pin;

Reference signs in the specific implementation manner: 1, transparent substrate; 2, bare lamp bead; 3, circuit pattern; 4, protective cover plate; 5, glue filling layer; 20, light emitting chip; 21, driving chip; 20r, red light Chip; 20g, green light-emitting chip; 20b, blue light-emitting chip; 211, signal pin; 212, first power supply pin; 213, second power supply pin; 214, short-circuit pin; 31, power supply line; 31a , the first power supply line; 31b, the second power supply line; 32, the signal line; 33, the signal pad; 311, the power jumper; 321, the signal jumper; 331, the first signal pad; 332, the second signal solder plate.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

In the description of the present application, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", The orientation or positional relationship indicated by "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" etc. is based on the orientation or positional relationship shown in the drawings, It is only for the purpose of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. In the description of the present application, unless otherwise specified, "plurality" means two or more.

In the description of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

Example 1

This example will specifically explain the bare lamp bead 2 disclosed in this application. As shown in Fig. 3 and Fig. 4, the bare lamp bead 2 disclosed in this example includes a driving chip 21 and a light emitting chip 20; the light emitting chip 20 is mounted on the driving chip 21;

The drive chip 21 is provided with a pair of power supply pins, a pair of signal pins 211 and a pair of short-circuit pins 214;

The signal pin 211 includes a first signal pin and a second signal pin, and the internal circuit of the driver chip 21 is passed between the first signal pin 211 and the second signal pin; The control signal for turning on and off the light-emitting chip 20 passes through the internal circuit of the driving chip 21 and is transmitted to the next bare lamp bead 2;

The shorting pin 214 includes a first shorting pin and a second shorting pin; the first shorting pin and the second shorting pin are shorted; control the light-emitting chip 20 The on-off control signal is transmitted to the next bare lamp bead 2 without passing through the internal circuit of the driver chip 21 .

The bare lamp bead 2 in the present application is based on the traditional LED lamp bead, and the encapsulation shell (the English name is housing, and the Chinese name is also called a bracket or a base) is cancelled. After the light-emitting chip 20 is mounted on the driving chip 21 , no packaging is required. The driver chip 21 with the light-emitting chip 20 is directly used as a light-emitting structure to replace the traditional LED lamp bead with a housing. That is to say, the bare lamp bead 2 named in this example is essentially the driver chip 21 embedded with the light-emitting chip 20 .

The bare lamp bead 2 has a size ranging from 0.5mm x 0.5mm to 0.7mm x 0.7mm. Much smaller than traditional LED lamp beads. Therefore, the resolution of the transparent LED display can be effectively improved.

Generally, the drive chip 21 is internally integrated with a drive circuit, and a passivation layer is provided on the drive chip 21 . The passivation layer is a surface insulating layer formed when the drive chip 21 is manufactured. The driver chip 21 is provided with a number of pins. The technique of installing the light-emitting chip 20 on the driver chip 21 is known to the public, and generally adopts (CSP or COC) technology to be fixedly mounted on the driver chip 21. The driver chip The pins on 21 are electrically connected to the light-emitting chip 20 by direct welding or by bonding wires. Bonding wires or bonding wires usually include gold wires, copper wires, palladium-coated copper wires, and alloy wires. No longer. The pin (English name: PAD) is generally arranged on the passivation layer, and the pin is a terminal inside the chip. The drive chip 21 includes a pair of signal pins 211, a power supply pin and a pair of short-circuit pins 214; wherein, the signal pin 211 includes a first signal pin and a second signal pin; the power supply The pins include a first power supply pin 212 and a second power supply pin 213; as shown in the figure, its driver chip 21 is divided into up, down, left and right directions; it can be seen that a pair of signal pins 211 are respectively Located at the upper right corner and the lower left corner of the driver chip 21; wherein, a pair of power supply pins are arranged at the upper part of the left side; the other pair of power supply pins are arranged at the lower part of the right side. In this example, as a preferred manner, the above-mentioned light-emitting chip 20 includes light-emitting chips 20 of three colors of red, green and blue, which are respectively referred to as the first light-emitting chip, the second light-emitting chip and the third light-emitting chip; wherein, the first light-emitting chip is The red light-emitting chip 20r, the second light-emitting chip is a green light-emitting chip 20g, and the third light-emitting chip is a blue light-emitting chip 20b. As shown in the figure, a red light emitting chip 20r, a green light emitting chip 20g and a blue light emitting chip 20b are sequentially mounted on the driving chip 21.

Wherein, the input and output of the signal pin 211 are reversed, for example, the first signal pin is a signal input pin, and the second signal pin is a signal output pin. Conversely, if the first signal pin is a signal output pin, then the second signal pin is a signal input pin. As a preferred manner, the two signal pins 211 can be switched to each other. One of the two signal pins 211 is used as a signal input pin, and the other is used as a signal output pin. As a preferred solution, the bare lamp bead 2 is preferably a two-way transmission bare lamp bead. The first signal pin of the bidirectional transmission bare lamp bead is an input signal pin, and the second signal pin is an output signal pin; otherwise, the second signal pin of the bidirectional transmission bare lamp bead is an input signal pin pin, the first signal pin is an output signal pin. Using this kind of bidirectional transmission bare lamp bead, it can realize the bidirectional input signal of the bare lamp bead 2 and transmit it when the bare lamp bead 2 is connected in series. The two-way transmission scheme is an original technology of the applicant. At present, the applicant has patented the driver chip 21 and the lamp bead for two-way transmission (for details, please refer to CN111341247A). In this example, you can directly refer to its two-way transmission scheme. No longer.

The pair of shorting pins 214 includes a shorting pin 214 of an input signal and a shorting pin 214 of an output signal; the pair of shorting pins 214 are shorted inside the driver chip 21, so that the The control signal is directly transmitted between the shorting pins 214 without going through the internal circuit of the driving chip 21 . For example, the first shorting pin is the shorting pin 214 of the input signal, then the second shorting pin is the shorting pin 214 of the output signal, and vice versa; the second shorting pin is the shorting pin of the input signal pin 214, the first short-circuit pin is the short-circuit pin 214 of the output signal.

Wherein, regarding the installation method of the light-emitting chip 20, it is preferable that the light-emitting chip 20 is installed on the driving chip 21 by means of CSP (English full name: Chip Scale Package, Chinese full name: Chip Scale Package). No longer. It can also be installed on the driver chip 21 by means of COC (full name in English: Chip On Chip, full name in Chinese: chip on chip). The above methods are well known to those skilled in the art and will not be repeated here.

Preferably, the light-emitting chip 20 is installed on the driver chip 21 as a whole bare lamp bead 2 and then installed on the transparent substrate 1, which is beneficial to improve process efficiency and yield.

Wherein, the bare lamp bead 2 is provided with color pins, and the color pins are electrically connected to the light-emitting chip 20 respectively. For example, the color pins include red pins, green pins and blue pins, the red pins are electrically connected to the red light-emitting chip 20r, the green pins are electrically connected to the green light-emitting chip 20g, and the blue pins are electrically connected to the blue light-emitting chip 20b; The on and off of each light-emitting chip is controlled by the above-mentioned color pins.

The bare lamp bead 2 provided in the present application adopts a shellless structure, so the size of the bare lamp bead 2 can be reduced. A pair of signal pins 211 and a pair of short-circuit pins 214 are set directly on the driver chip 21, so that the bare lamp bead 2 can receive two sets of control signals, and one set of control signals is input and output from the signal pins 211 , the control signal will pass through the internal circuit of the driver chip 21 to control the light-emitting chip 20 to turn on and off, and then transmit it to the next bare lamp bead 2; It will not pass through the internal circuit of the driver chip 21, but will be directly transmitted to the next bare lamp bead 2. In this way, when the bare lamp beads 2 are connected in series to form a lamp bead string, the two sets of control signals act on the lamp bead string at intervals and are transmitted at intervals among the two bare lamp bead strings. This method can effectively lengthen the length of the lamp bead string, so that when it is applied to the LED display screen, the size of the LED display screen can be enlarged.

Example 2

This example will specifically explain the LED display screen disclosed in this application. As shown in Figure 5 and Figure 6, the LED display screen disclosed in this example includes a substrate and bare lamp beads 2; circuit patterns 3 are arranged on the substrate; the array of bare lamp beads 2 is arranged on the substrate; The bare lamp bead 2 is the bare lamp bead 2 shown in Embodiment 1 above.

The circuit pattern 3 includes a power supply pad (not shown in the figure), a signal pad 33 and a power supply line 31; the power supply line 31 includes a plurality of first power supply lines 31a and second power supply lines 31b with opposite polarities; The power supply pad is connected to the first power supply line 31a and the second power supply line 31b;

The first power supply pin 212 is directly or indirectly connected to the first power supply line 31a, and the second power supply pin 213 is directly or indirectly connected to the second power supply line 31b;

A number of bare lamp beads 2 are connected in series to form a lamp bead string, and each of the lamp bead strings is correspondingly provided with two signal pads 33, which are respectively called the first signal pad 331 and the second signal pad 332;

In the lamp bead string, the signal pin 211 of the input signal of the first bare lamp bead 2 is connected to the first signal pad 331, and the short-circuit pin of the input signal of the first bare lamp bead 2 214 is connected to the second signal pad 332; or, the signal pin 211 of the input signal of the first bare lamp bead 2 is connected to the second signal pad 332, and the input signal of the first bare lamp bead 2 The shorting pin 214 is connected to the first signal pad 331;

The signal pin 211 of the input signal of each of the other bare lamp beads 2 is connected to the short-circuit pin 214 of the output signal of the previous bare lamp bead 2, and the short-circuit pin 214 of the input signal of each of the bare lamp beads 2 Connect to the signal pin 211 of the output signal of the previous bare lamp bead 2; the signal pin 211 of the output signal of each bare lamp bead 2 is connected to the short-circuit pin 214 of the input signal of the next bare lamp bead 2, each bare The short-circuit pin 214 of the output signal of the lamp bead 2 is connected to the signal pin 211 of the input signal of the next bare lamp bead 2 .

As for the manner of signal connection between the above-mentioned bare lamp beads 2 , signal lines 32 known to those skilled in the art can be used to connect the signal pads and the bare lamp beads 2 . As a preferred method, which is not known to the public, the bare lamp bead 2 is bound and connected to the signal pad, or the shorting pad, or the bare lamp bead 2 before and after it through the signal jumper 321 .

In this way, one row of lamp bead strings can be changed into two rows of lamp bead strings controlled by two control signals. For example, the odd-numbered bare lamp beads 2 in the lamp bead string transmit the control signal from the first signal pad 331 ; the even-numbered bare lamp beads 2 in the lamp bead string transmit the control signal from the second signal pad 332 ; and vice versa. Due to the above-mentioned special binding connection method, the two signals in the first signal pad 331 and the second signal pad 332 are always transmitted in the adjacent bare lamp bead 2 or are short-circuited without passing through the bare lamp bead 2. Inside the lamp bead 2.

Further description is as follows, assuming that the control signal input in the first signal pad 331 is the first control signal, and the control signal input in the second signal pad 332 is the second control signal; Taking the bare lamp bead 2 as an example, the first signal pad 331 is bonded and connected to the short pin 214 of the input signal of the bare lamp bead 2 in the first column and row; the second signal pad 332 is bonded and connected to the first The signal pin 211 of the input signal of the bare lamp bead 2 in the first row of the column, so that the first control signal transmitted in the first signal pad 331 is short-circuited in the bare lamp bead 2 in the first column and first row to the first column The signal pin 211 of the input signal of the bare lamp bead 2 in the second row does not pass through the inside of the bare lamp bead 2 in the first row; so that the second control signal transmitted in the second signal pad 332 passes through the first column The bare lamp beads 2 in the first row are controlled by the second control signal to turn on and off the bare lamp beads 2 in the first column and the first row, and are transmitted to the short-circuit pin 214 of the input signal of the bare lamp beads 2 in the first column and the second row . By analogy, the bare lamp beads 2 in the first column and the second row input the first control signal from the signal pin 211 of the input signal to control the on and off of the bare lamp beads 2 in the first column and the second row, and output the signal from the signal pin 211. The pin 211 is output to the short-circuit pin 214 of the input signal of the bare lamp bead 2 in the first column and the third row, and the second control signal is short-circuited in the first column and the second row of the bare lamp bead 2 without passing through it. By analogy, the first control signal sequentially passes through the bare lamp beads 2 in the even rows to control the on and off of the bare lamp beads 2 in the even rows, and is short-circuited and transmitted in the bare lamp beads 2 in the odd rows. The second control signal sequentially passes through the bare lamp beads 2 in the odd rows to control the on and off of the bare lamp beads 2 in the odd rows, and is short-circuited and transmitted among the bare lamp beads 2 in the even rows. Of course, the reverse is also possible.

In this way, the number of bare lamp beads 2 connected in series in one row or one column of lamp strings can be increased. In this way, the number of bare lamp beads 2 in the lamp bead string is twice that of the LED lamp beads in the conventional lamp string.

The substrate may be various substrates known to those skilled in the art, such as an opaque substrate or a transparent substrate 1 . In this example, a transparent substrate 1 is preferably used. At this time, the LED display is a transparent LED display.

Wherein, the bare lamp bead 2 is bound and connected to the transparent substrate 1 by means of COG (English full name: chip on glass). The COG method means that the chip is directly bound on the transparent substrate 1 . This is well known to those skilled in the art.

In this example, the transparent substrate 1 on which the bare lamp beads 2 are arranged is provided with a glue filling layer 5, and the glue filling layer 5 encapsulates each of the bare lamp beads 2 therein; A protective cover 4 is provided on the surface. The design of the glue filling layer 5 and the protective cover 4 is well known to those skilled in the art, and will not be repeated here.

The power supply line 31 includes a plurality of the first power supply line 31a and the second power supply line 31b arranged at intervals in rows or columns; between the first power supply line 31a and the second power supply line 31b Several rows or columns of bare lamp beads 2; the bare lamp beads 2 share the first power supply line 31a and the second power supply line 31b. For example, as shown in Figure 7, a first power supply line 31a, a second power supply line 31b, and a first power supply line 31a are arranged at intervals; Rows and 4 columns of bare lamp beads 2; the above-mentioned 4 rows and 4 columns of bare lamp beads 2 share the first power supply line 31a and the second power supply line 31b. There are also 4 rows and 4 columns of bare lamp beads 2 between the first power supply line 31a and the second power supply line 31b on the right; the above-mentioned 4 rows and 4 columns of bare lamp beads 2 share the first power supply line 31a and the second power supply line on the right Line 31b.

By adopting the above method, several columns or rows of bare lamp beads 2 share the power supply line 31 of the same polarity. Such a circular arrangement can make a large-area transparent LED display screen. Several bare lamp beads 2 sharing the power supply line 31 can reduce the number of power supply lines 31, reduce the obstruction of the line of sight, and help to improve the transparency of the display screen.

The present application is not limited to the implementation manner of the power supply line 31, which is not the core innovation content of the present application, and implementations known to those skilled in the art can be adopted. The number of the first power supply line 31a and the second power supply line 31b can be There may be only one of them, or there may be a plurality of them, and the numbers of the first power supply lines 31a and the second power supply lines 31b may be the same or different. The specific number is determined according to the power supply capacity of the power supply line 31 and the current demand of the bare lamp bead 2 between the first power supply line 31a and the second power supply line 31b.

The form of the power supply line 31 may be straight, curved, or serpentine. As a preferred manner, generally, each power supply line 31 is arranged in a row or a column, and its implementation is not limited, as long as it can provide power supply. For example, it can be a metal layer etched on the transparent substrate 1, or a metal grid, it can also be a nano-silver coating or an ITO coating, or it can be a metal wire laid out in the applicant's previous patent application, or buried in Metal sheet in the transparent substrate 1 etc. realizes.

The first power supply pin 212 on each bare lamp bead 2 is bound and connected to the first power supply line or the first power supply pin 212 on the adjacent bare lamp bead 2 through a power jumper 311; The second power supply pin 213 on the bead 2 is bound and connected to the second power supply line through the power jumper 311, or the second power supply pin 213 on its adjacent bare lamp bead 2; so that each bare lamp bead 2 can be directly powered from The line takes power, or takes power from its adjacent bare lamp bead 2 .

The power jumper 311 and the signal jumper 321 in this example are binding wires or bonding wires understood by those skilled in the art, and here they are only used to distinguish devices, and they are named respectively. Using the power jumper 311 and the signal jumper 321 can effectively improve the transparency of the transparent LED display. The above-mentioned power jumper 311 and signal jumper 321 preferably have a diameter of 15 μm-70 μm and are made of gold wire, copper wire or alloy wire. Because of its small diameter, it is almost invisible to the naked eye. While the lamp bead 2 is working with current, it reduces the obstruction to the line of sight and improves the transparency of the product.

Although the power jumper 311 and the signal jumper 321 cross each other in the schematic diagram, they are bonded at different heights in the actual production process, and then fixed by glue filling, so no collapse and short circuit will occur Case.

The LED display screen disclosed in the present application can reduce the size of the bare lamp beads 2 because the bare lamp beads 2 arranged in an array adopt a shell-less structure. Directly set a pair of signal pins and a pair of short-circuit pins 214 on its driver chip 21, so that its bare lamp bead 2 can receive two sets of control signals, and when one set of control signals is input and output from the signal pins, the control The signal will pass through the internal circuit of the driver chip 21 to control the light-emitting chip 20 to turn on and off, and then transmit to the next bare lamp bead 2; while another set of control signals is input and output through the short-circuit pin 214, the control signal will not Through the internal circuit of the driver chip 21, it is directly transmitted to the next bare lamp bead 2. Each bare lamp bead 2 is not only connected to the control signal output by the second upstream bare lamp bead 2 and works, but also is the signal transmission medium of the previous bare lamp bead 2, and the control signal of the previous bare lamp bead 2 The signal is directly transmitted to the next bare lamp bead 2 without passing through the bare lamp bead 2 . In this way, when the bare lamp beads 2 are connected in series to form a lamp bead string, the two sets of control signals act on the lamp bead string at intervals and are transmitted at intervals in the two bare lamp bead strings. This method can effectively lengthen the length of the lamp bead string, so that when it is applied to the LED display screen, the size of the LED display screen can be enlarged.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the application should be included in the protection of the application. within range.

Claims

A bare lamp bead, wherein the bare lamp bead includes a driver chip and a light-emitting chip; the light-emitting chip is mounted on the driver chip;

The drive chip is provided with a pair of power supply pins, a pair of signal pins and a pair of short-circuit pins;

The signal pins include a first signal pin and a second signal pin, and the internal circuit of the driver chip is passed between the first signal pin and the second signal pin to control the brightness of the light-emitting chip. The control signal for turning off passes through the internal circuit of the driver chip and is transmitted to the next bare lamp bead;

The shorting pins include a first shorting pin and a second shorting pin; the first shorting pin and the second shorting pin are shorted to control the light-emitting chip to turn on and off The control signal does not pass through the internal circuit of the driver chip, and is transmitted to the next bare lamp bead.
The bare lamp bead according to claim 1, wherein the bare lamp bead is a two-way transmission bare lamp bead.
The bare lamp bead according to claim 1, wherein color pins are provided on the bare lamp bead, and the color pins are respectively electrically connected to the light-emitting chip.
The LED display screen according to claim 1, wherein the light-emitting chip is mounted on the driving chip through CSP or COC.
An LED display screen, including a substrate and bare lamp beads; a circuit pattern is arranged on the substrate; an array of the bare lamp beads is arranged on the substrate;

The circuit pattern includes a power supply pad, a signal pad and a power supply line; the power supply line includes a number of first power supply lines and second power supply lines with opposite polarities; the power supply pad connects the first power supply line and the the second power supply line;

The bare lamp bead includes a driver chip and a light-emitting chip; the light-emitting chip is installed on the driver chip; the driver chip is provided with more than one pair of power supply pins, a pair of signal pins and a pair of short-circuit pins;

The power supply pins include a first power supply pin and a second power supply pin; the first power supply pin is directly or indirectly connected to the first power supply line, and the second power supply pin is directly or indirectly connected to the the second power supply line;

The signal pins include a first signal pin and a second signal pin, and the internal circuit of the driver chip is passed between the first signal pin and the second signal pin; The control signal for turning off passes through the internal circuit of the driver chip and is transmitted to the next bare lamp bead;

The shorting pins include a first shorting pin and a second shorting pin; shorting between the first shorting pin and the second shorting pin; controlling the light-emitting chip to turn on and off The control signal does not pass through the internal circuit of the driver chip, and is transmitted to the next bare lamp bead;

A number of bare lamp beads are connected in series to form a lamp bead string, and each of the lamp bead strings is correspondingly provided with two of the signal pads, which are respectively called the first signal pad and the second signal pad;

In the lamp bead string, the signal pin of the input signal of the first bare lamp bead is connected to the first signal pad, and the short-circuit pin of the input signal of the first bare lamp bead is connected to the second signal pad; or, the signal pin of the input signal of the first bare lamp bead is connected to the second signal pad, and the shorting pin of the input signal of the first bare lamp bead is connected to the first signal Pad;

The signal pins of the input signals of the other bare lamp beads are connected to the short-circuit pins of the output signals of the previous bare lamp beads, and the short-circuit pins of the input signals of each of the bare lamp beads are connected to the previous bare lamp beads. The signal pin of the output signal of each bare lamp bead; the signal pin of the output signal of each bare lamp bead is connected to the short-circuit pin of the input signal of the next bare lamp bead, and the short-circuit pin of the output signal of each bare lamp bead is connected to The signal pin of the input signal of the last bare lamp bead.
The LED display screen according to claim 5, wherein the substrate is a transparent substrate.
The LED display screen according to claim 6, wherein the bare lamp bead is bound and connected to the transparent substrate by COG.
The LED display screen according to claim 6, wherein the transparent substrate on which the bare lamp beads are arranged is provided with a glue filling layer, and the glue filling layer encapsulates each of the bare lamp beads therein; the glue filling layer The upper surface of the layer is provided with a protective cover.
The LED display screen according to claim 6, wherein the bare lamp bead is bound and connected to the signal pad, or the shorting pad, or the bare lamp bead before and after it through a signal jumper.
The LED display screen according to claim 5, wherein, the power supply lines include a plurality of the first power supply lines and the second power supply lines arranged at intervals in rows or columns; the first power supply lines and the Several rows or columns of the bare lamp beads are arranged between the second power supply lines; the bare lamp beads share the first power supply line and the second power supply line.
The LED display screen according to claim 6, wherein the first power supply pins on each bare lamp bead are bound and connected to the first power supply line or the first power supply pin on the adjacent bare lamp bead through a power jumper. pins; the second power supply pins on each of the bare lamp beads are bound and connected to the second power supply line or the second power supply pins on the adjacent bare lamp beads through a power jumper; so that each bare lamp bead can be directly Take power from the power supply line, or take power from its adjacent bare lamp beads.
The LED display screen according to claim 9 or 11, wherein the diameters of the power jumper and the signal jumper are 15 μm-70 μm.