LED display device and display equipment

Abstract

The utility model discloses an LED display device and display equipment, including at least two LED light-emitting wafers, IC chip, circuit board and packaging glue, the IC chip is electrically connected with the LED light-emitting wafers and is used for driving the LED light-emitting wafers to emit light, the LED light-emitting wafers and the IC chip are arranged at one side of the circuit board, the circuit board is electrically connected with the LED light-emitting wafers and the IC chip through internal lines, and the packaging glue is used for packaging the LED light-emitting wafers and the IC chip. The LED light-emitting wafers and the IC chip are arranged on the circuit board and used for transmitting external electric signals to the LED light-emitting wafers and the IC chip, the packaging adhesive is arranged on the circuit board and wraps the LED light-emitting wafers and the IC chip, the LED light-emitting wafers and the IC chip are arranged on the circuit board, a reflection cup does not need to be arranged, the space on the surface of the circuit board can be utilized to the maximum extent, the at least two LED light-emitting wafers are arranged in a straight line, and the LED light-emitting wafers and the IC chip are arranged on the circuit board. And the straight line coincides with one center line of the circuit board, so that the problem that obvious color cast exists when a user watches the LED light-emitting wafers from a large angle perpendicular to the arrangement direction due to the fact that the at least two LED light-emitting wafers are not on the same straight line is solved, and the display quality is improved.

Description

Technical Field

[0001] The utility model relates to display technology, in particular to an LED display device and a display equipment. Background Art

[0002] Traditional LED display devices directly encapsulate LED light-emitting chips, and then use external IC chips to drive the LED light-emitting chips to emit light. However, the external IC chips are easily affected by the outside world. The complex and changeable external environment can easily cause problems such as failure of LED display devices, thereby affecting the service life of LED display devices. Therefore, LED display devices with built-in IC chips came into being.

[0003] An LED display device with a built-in IC chip encapsulates an IC chip in a bare crystal state inside the LED display device. The electrodes of the LED light-emitting chip are connected to the pins of the IC chip through internal welding wires. The pins of the IC chip and the conductive pins of the LED display device are connected together through bonding wires to transmit electrical signals. The light emission of the LED display device is independently controlled by adjusting the IC chip.

[0004] At present, most of the display devices on the market that are assembled using LED display devices with built-in IC chips have the problem of a small optimal viewing angle. When viewed from the optimal viewing angle, there will be obvious color cast. Utility Model Content

[0005] The utility model provides an LED display device and a display equipment, which can reduce the color cast problem of the display equipment and improve the display quality.

[0006] In a first aspect, the utility model provides an LED display device, comprising:

[0007] At least two LED light-emitting chips;

[0008] An IC chip, the IC chip is electrically connected to the LED light-emitting chip and is used to drive the LED light-emitting chip to emit light;

[0009] A circuit board, the LED light emitting chip and the IC chip are arranged on one side of the circuit board, the circuit board is electrically connected to the LED light emitting chip and the IC chip through internal circuits, and is used to transmit external electrical signals to the LED light emitting chip and the IC chip;

[0010] Packaging glue, the packaging glue is arranged on the circuit board and covers the LED light-emitting chip and the IC chip;

[0011] The at least two LED light-emitting chips are arranged in a straight line, and the straight line coincides with one of the center lines of the circuit board.

[0012] Optionally, the circuit board includes a die-bonding pad, a core-bonding pad, a data input pad, and a data output pad, and the IC chip includes a data input pin, a data output pin, at least two LED signal output pins, a power input pin, and a ground pin;

[0013] The LED light emitting chip is fixed on the die bonding pad, and the anode of the LED light emitting chip is electrically connected to the die bonding pad, and the die bonding pad is electrically connected to the power input pin of the IC chip;

[0014] The IC chip is fixed on the core fixing pad, and the core fixing pad is electrically connected to the ground pin of the IC chip;

[0015] The data input pad is electrically connected to the data input pin of the IC chip;

[0016] The data output pad is electrically connected to the data output pin of the IC chip;

[0017] The cathodes of the at least two LED light-emitting chips are electrically connected to the at least two LED signal output pins of the IC chip accordingly.

[0018] Optionally, a data input pin, a data output pin, a power input pin and a ground pin are provided on a side of the circuit board away from the LED light-emitting chip, the data input pin is electrically connected to the data input pad, the data output pin is electrically connected to the data output pad, the power input pin is electrically connected to the die bonding pad, and the ground pin is electrically connected to the core bonding pad.

[0019] Optionally, the circuit board includes a die-bonding pad, a core-bonding pad, a data input pad, a data output pad, and a ground pad, and the IC chip includes a data input pin, a data output pin, at least two LED signal output pins, a power input pin, and a ground pin;

[0020] The LED light emitting chip is fixed on the die bonding pad, and the anode of the LED light emitting chip is electrically connected to the die bonding pad, and the die bonding pad is electrically connected to the power input pin of the IC chip;

[0021] The IC chip is fixed on the core fixing pad;

[0022] The data input pad is electrically connected to the data input pin of the IC chip;

[0023] The data output pad is electrically connected to the data output pin of the IC chip;

[0024] The ground pad is electrically connected to the ground pin of the IC chip;

[0025] The cathodes of the at least two LED light-emitting chips are electrically connected to the at least two LED signal output pins of the IC chip accordingly.

[0026] Optionally, a data input pin, a data output pin, a power input pin and a ground pin are provided on a side of the circuit board away from the LED light-emitting chip, the data input pin is electrically connected to the data input pad, the data output pin is electrically connected to the data output pad, the power input pin is electrically connected to the die bonding pad, and the ground pin is electrically connected to the ground pad.

[0027] Optionally, the circuit board includes two data input pads and two data input pins, the IC chip includes two data input pins, the data input pad is electrically connected to a corresponding data input pin, and the data input pin is electrically connected to a corresponding data input pad.

[0028] Optionally, a suspended pin is provided on a side of the circuit board away from the LED light-emitting chip, two of the data input pins are located on a first edge of the side of the circuit board away from the LED light-emitting chip, one of the data input pins is adjacent to the third edge and is spaced a preset distance from the third edge, and the other data input pin is adjacent to the fourth edge and is spaced a preset distance from the fourth edge, wherein the third edge and the fourth edge are opposite;

[0029] The data output pin and the suspended pin are located at a second edge opposite to the first edge, wherein the data output pin is adjacent to a third edge and is spaced a preset distance from the third edge, and the suspended pin is adjacent to a fourth edge and is spaced a preset distance from the fourth edge;

[0030] The power input pin is located in the middle of the third edge, and the ground pin is located in the middle of the fourth edge.

[0031] Optionally, a suspended pin is provided on a side of the circuit board away from the LED light-emitting chip, two of the data input pins and the power input pin are located at a first edge of the side of the circuit board away from the LED light-emitting chip, one of the data input pins is located in the middle of the first edge, the other data input pin is located at a corner formed by the first edge and a fourth edge, and the power input pin is located at a corner formed by the first edge and a third edge, wherein the third edge and the fourth edge are opposite;

[0032] The ground pin, the suspended pin and the data output pin are located at a second edge opposite to the first edge, wherein the suspended pin is located in the middle of the second edge, the data output pin is located at a corner formed by the second edge and the third edge, and the ground pin is located at a corner formed by the second edge and the fourth edge.

[0033] Optionally, an indicating ink for indicating a fixing direction of the LED display device is provided on a side of the circuit board away from the LED light-emitting chip.

[0034] Optionally, the LED display device includes three LED light-emitting chips, namely a red light-emitting chip, a green light-emitting chip and a blue light-emitting chip, wherein the red light-emitting chip is located between the green light-emitting chip and the blue light-emitting chip.

[0035] Optionally, the IC chip includes a reverse voltage output circuit, the input end of the reverse voltage output circuit is electrically connected to the voltage supply end inside the IC chip, the output end of the reverse voltage output circuit is electrically connected to the cathode of the LED light-emitting chip, and the reverse voltage output circuit is used to output a reverse voltage to the LED light-emitting chip.

[0036] Optionally, the reverse voltage output circuit includes a first resistor, a second resistor and n transistors;

[0037] The first end of the first resistor is electrically connected to the voltage supply end inside the IC chip, and the second end of the first resistor is connected in series with the first to n-1th transistors in sequence, wherein the collector of the first transistor is connected to the second end of the first resistor, the emitter of the n-1th transistor is grounded, and the bases of the first to n-1th transistors are all electrically connected to the collector;

[0038] The collector of the nth transistor is electrically connected to the voltage supply end inside the IC chip, the emitter of the nth transistor is connected to the first end of the second resistor, the second end of the second resistor is grounded, the base of the nth transistor is connected to the collector of the first transistor, and the emitter of the nth transistor serves as the output end of the reverse voltage output circuit.

[0039] Optionally, the IC chip includes a constant current drive circuit, the power input pin of the IC chip is connected to the anode of the LED light-emitting chip, the cathode of the LED light-emitting chip is connected to the first end of the constant current drive circuit, the second end of the constant current drive circuit is grounded, and the control end of the constant current drive circuit is connected to the data input pin of the IC chip. The IC chip controls the operation of the constant current drive circuit through the data signal input through the data input pin, thereby providing a constant drive current to the LED light-emitting chip.

[0040] Optionally, the constant current driving circuit includes a first transistor, a second transistor and a third resistor;

[0041] The first end of the first transistor is connected to the cathode of the LED light emitting chip, the second end of the first transistor is connected to the first end of the third resistor, the second end of the third resistor is grounded, and the control end of the first transistor is connected to the data input pin of the IC chip;

[0042] The first end of the second transistor is connected to the control end of the first transistor, the second end of the second transistor is grounded, and the control end of the second transistor is connected to the first end of the third resistor.

[0043] In a second aspect, the utility model further provides a display device, comprising a plurality of LED display devices as provided in the first aspect of the utility model, and further comprising a drive controller, wherein the drive controller comprises a plurality of output terminals;

[0044] The plurality of LED display devices are divided into a plurality of groups of devices corresponding to the plurality of groups of output terminals, each group of devices comprising N LED display devices connected in series;

[0045] A group of devices is electrically connected to a group of output terminals corresponding to the drive controller.

[0046] Optionally, the LED display device includes a first data input pin, a second data input pin, and a data output pin;

[0047] Each group of output terminals of the driving controller includes a data output terminal;

[0048] In each group of devices, the second data input pin of the first LED display device is connected to the data output end of the corresponding group of output ends, the first data input pin of the first LED display device is suspended, the data output pin of the Kth LED display device is electrically connected to the second data input pin of the K+1th LED display device, and the data output pin of the Kth LED display device is electrically connected to the first data input pin of the K+2th LED display device, wherein N≥3, 1≤K≤N.

[0049] The LED display device provided by the utility model comprises at least two LED light-emitting chips, an IC chip, a circuit board and packaging glue. The IC chip is electrically connected to the LED light-emitting chips and is used to drive the LED light-emitting chips to emit light. The LED light-emitting chips and the IC chip are arranged on one side of the circuit board. The circuit board is electrically connected to the LED light-emitting chips and the IC chip through internal circuits and is used to transmit external electrical signals to the LED light-emitting chips and the IC chip. The packaging glue is arranged on the circuit board and covers the LED light-emitting chips and the IC chip. By arranging the LED light-emitting chips and the IC chip on the circuit board, there is no need to arrange a reflective cup, and the space on the surface of the circuit board can be utilized to the maximum extent. At least two LED light-emitting chips are arranged in a straight line, and the straight line coincides with one of the center lines of the circuit board, so as to avoid the problem of obvious color cast when the user watches from a large angle perpendicular to the arrangement direction due to the fact that the at least two LED light-emitting chips are not on the same straight line, thereby improving the display quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The utility model is further described in detail below based on the drawings and embodiments.

[0051] Figure 1 It is a structural schematic diagram of an LED display device in the prior art;

[0052] Figure 2 A schematic diagram of the lighting effect of an LED display device in the prior art;

[0053] Figure 3 A top view of an LED display device provided by an embodiment of the utility model;

[0054] Figure 4 for Figure 3 Bottom view of the LED display device;

[0055] Figure 5 for Figure 3 A cross-sectional view of an LED display device;

[0056] Figure 6 A light-emitting effect diagram of an LED display device provided by an embodiment of the utility model;

[0057] Figure 7 A schematic diagram of a reverse voltage output circuit provided by an embodiment of the utility model;

[0058] Figure 8 for Figure 7 Equivalent circuit of the reverse voltage output circuit;

[0059] Fig. 9 A schematic diagram of a constant current drive circuit provided by an embodiment of the utility model;

[0060] Fig.10 A top view of another LED display device provided by an embodiment of the utility model;

[0061] Fig.11 for Fig.10 Bottom view of the LED display device;

[0062] Fig.12 A top view of another LED display device provided by an embodiment of the utility model;

[0063] Fig.13 for Fig.12 Bottom view of the LED display device;

[0064] Fig.14 A schematic diagram of the structure of a display device provided by an embodiment of the utility model;

[0065] Fig.15 for Fig.14 A schematic diagram of the circuit structure of the display device;

[0066] Fig.16 A schematic diagram of the structure of another display device provided by an embodiment of the utility model;

[0067] Fig.17 for Fig.16 A schematic diagram of the circuit structure of the display device;

[0068] Fig.18 A schematic structural diagram of another display device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0069] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0070] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present utility model, unless otherwise clearly stipulated and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.

[0072] Figure 1 It is a structural schematic diagram of an LED display device in the prior art. Figure 2 FIG. 1 is a schematic diagram of the light emitting effect of an LED display device in the prior art, such as Figure 1 As shown, most of the existing LED display devices with IC chips adopt a "TOP cup" structure, including a bracket 11, LED light-emitting chips 12, 13, 14, and an IC chip 15. The bracket 11 is formed with a solder pad and a pin. The top of the bracket 11 is grooved to form a reflective cup 16. The LED light-emitting chips 12, 13, 14, and the IC chip 15 are arranged at the bottom of the reflective cup 16. Since the bottom of the reflective cup 16 is usually circular and has a small opening area, in order to accommodate multiple LED light-emitting chips and IC chips at the bottom of the reflective cup 16 at the same time, it is usually necessary to arrange the multiple light-emitting chips in a triangle shape to adapt to the shape and area of ​​the bottom of the cup, that is, the multiple light-emitting chips are not in the same straight line. Since the multiple light-emitting chips are not in the same straight line, when emitting light, such as Figure 2 As shown, the halos of multiple light-emitting chips (R in the figure represents red halo, G represents green halo, and B represents blue halo) cannot overlap in the direction perpendicular to the arrangement direction, resulting in obvious color cast when the user views from a large angle perpendicular to the arrangement direction.

[0073] In view of the above problems, the embodiment of the utility model provides an LED display device to solve the color cast problem of the LED display device with a built-in IC chip. Figure 3 A top view of an LED display device provided by an embodiment of the utility model, Figure 4 for Figure 3 Bottom view of the LED display device. Figure 5 for Figure 3 The cross-sectional view of the LED display device in Figure 3 As shown in CC, Figure 3-Figure 5 As shown, the LED display device includes:

[0074] At least two LED light-emitting chips. For example, in an embodiment of the utility model, the LED display device includes three LED light-emitting chips, which are a red light-emitting chip 111, a green light-emitting chip 112 and a blue light-emitting chip 113, which emit red light, green light and blue light respectively.

[0075] IC chip 120, IC chip 120 is electrically connected to the LED light emitting chip, and is used to drive the LED light emitting chip to emit light. Exemplarily, IC chip 120 receives externally transmitted data signals, controls at least one of the three LED light emitting chips to emit light, and controls the light brightness.

[0076] The circuit board 130, the LED light emitting chip and the IC chip 120 are arranged on one side of the circuit board 130, and the circuit board 130 is electrically connected to the LED light emitting chip and the IC chip 120 through internal circuits, and is used to transmit external electrical signals to the LED light emitting chip and the IC chip 120. Exemplarily, the external electrical signals may include power signals, ground signals, data signals, etc. The power signal is used to provide the power supply voltage required by the LED light emitting chip and the IC chip 120, the ground signal is used to ground the LED light emitting chip and the IC chip 120, and the data signal is used to control the light emission of the LED light emitting chip and the brightness of the light emission.

[0077] The packaging glue 140 is disposed on the circuit board 130 and covers the LED light emitting chip and the IC chip 120. The packaging glue 140 is used to fix the LED light emitting chip and the IC chip 120, and can also protect the LED light emitting chip and the IC chip 120 from external moisture.

[0078] Among them, at least two LED light-emitting chips are arranged in a straight line. Exemplarily, the centers of the three LED light-emitting chips are on the same straight line L, and the straight line L coincides with one of the center lines of the circuit board 130, that is, the LED light-emitting chips are located in the middle of the circuit board 130.

[0079] Figure 6 The lighting effect diagram of the LED display device provided by the embodiment of the utility model is as follows: Figure 6 As shown, since multiple light-emitting chips are on the same straight line and the straight line coincides with one of the center lines of the circuit board, when emitting light, the halos of multiple light-emitting chips (R in the figure represents red halo, G represents green halo, and B represents blue halo) can almost coincide in the direction perpendicular to the arrangement direction, and there will be no obvious color cast when the user views from a large angle perpendicular to the arrangement direction.

[0080] The LED display device provided by the embodiment of the utility model includes at least two LED light-emitting chips, an IC chip, a circuit board and packaging glue. The IC chip is electrically connected to the LED light-emitting chips and is used to drive the LED light-emitting chips to emit light. The LED light-emitting chips and the IC chip are arranged on one side of the circuit board. The circuit board is electrically connected to the LED light-emitting chips and the IC chip through internal circuits and is used to transmit external electrical signals to the LED light-emitting chips and the IC chip. The packaging glue is arranged on the circuit board and covers the LED light-emitting chips and the IC chip. By arranging the LED light-emitting chips and the IC chip on the circuit board, there is no need to set a reflective cup, and the space on the surface of the circuit board can be maximized. At least two LED light-emitting chips are arranged in a straight line, and the straight line coincides with one of the center lines of the circuit board, so as to avoid the problem of obvious color cast when the user watches from a large angle perpendicular to the arrangement direction due to the at least two LED light-emitting chips not being on the same straight line, thereby improving the display quality.

[0081] In some embodiments of the present invention, Figure 3 , Figure 4 As shown, the circuit board includes a die bonding pad 131, a core bonding pad 132, a data input pad 133 and a data output pad 134, and the IC chip 120 includes a data input pin DI, a data output pin DO, at least two LED signal output pins (exemplarily, in the embodiment of the utility model, including three LED signal output pins, respectively O R , O G and O B ), power input pin VDD and ground pin GND.

[0082] The three LED light-emitting chips are all fixed on the die bonding pad 131, and the anode of the LED light-emitting chip is electrically connected to the die bonding pad 131, and the die bonding pad 131 is electrically connected to the power input pin VDD of the IC chip 120. Exemplarily, in the embodiment of the present utility model, the red light-emitting chip 111 is a vertical chip, the green light-emitting chip 112 and the blue light-emitting chip 113 are upright chips, the anode and cathode of the upright chip are both located on the light-emitting surface of the upright chip, and the anode and cathode of the vertical chip are respectively located on the light-emitting surface and the backlight surface of the vertical chip. The anode of the red light-emitting chip 111 is fixed on the die bonding pad 131 by a conductive material (for example, conductive glue or solder paste) to achieve electrical connection, and the anodes of the green light-emitting chip 112 and the blue light-emitting chip 113 are respectively electrically connected to the die bonding pad 131 by metal leads. It should be noted that in other embodiments of the present utility model, the LED light-emitting chip can also be other types of light-emitting chips, and accordingly, the pad arrangement can be adjusted accordingly according to the type of the light-emitting chip, and the embodiment of the present utility model is not limited here. In addition, in other embodiments of the present invention, a die-bonding pad may be separately provided for each light-emitting chip, and the embodiments of the present invention are not limited thereto.

[0083] In the embodiment of the utility model, the red light-emitting chip 111 is located between the green light-emitting chip 112 and the blue light-emitting chip 113. This is because the human eye is more sensitive to red light. By setting the red light-emitting chip 111 between the green light-emitting chip 112 and the blue light-emitting chip 113, the color deviation of the red light can be reduced.

[0084] The IC chip 120 is fixed on the core pad 132 by insulating glue, and the core pad 132 is electrically connected to the ground pin GND of the IC chip 120. The data input pad 133 is electrically connected to the data input pin DI of the IC chip 120, and the data output pad 134 is electrically connected to the data output pin DO of the IC chip 120. R The cathode of the green light emitting chip 112 is electrically connected to the signal output pin O of the IC chip 120 through a metal wire. G The cathode of the blue light emitting chip 113 is electrically connected to the signal output pin O of the IC chip 120 through a metal wire. B Electrically connected via metal wires.

[0085] A data input pin 135, a data output pin 136, a power input pin 137 and a ground pin 138 are provided on the side of the circuit board 130 away from the LED light-emitting chip. The data input pin 135 is electrically connected to the data input pad 133 through a metal via H1 passing through the circuit board 130, the data output pin 136 is electrically connected to the data output pad 134 through a metal via H2 passing through the circuit board 130, the power input pin 137 is electrically connected to the die-bonding pad 131 through a metal via H3 passing through the circuit board 130, and the ground pin 138 is electrically connected to the die-bonding pad 132 through a metal via H4 passing through the circuit board 130.

[0086] Exemplarily, the power input pin 137 is used to receive the power signal, and to supply power to the power input pin VDD of the IC chip 120 through the die bonding pad 131, and to supply power to the anode of each LED light-emitting chip. The data input pin 135 is used to receive the data signal, and to provide the data signal to the data input pin DI of the IC chip 120 through the data input pad 133. The IC chip 120 analyzes the data signal to obtain the LED display signal, and outputs the LED display signal to the three LED signal output pins O. R , O G , O B The data output pin DO of IC chip 120 provides data signal to the data input pin DI of the next LED display device through data output pad 134 and data output pin 136.

[0087] In the embodiment of the utility model, the IC chip 120 includes a reverse voltage output circuit, the input end of the reverse voltage output circuit is connected to the voltage supply end inside the IC chip 120, the output end of the reverse voltage output circuit is electrically connected to the cathode of the LED light-emitting chip, and the reverse voltage output circuit is used to output a reverse voltage to the LED light-emitting chip. Exemplarily, the voltage at the voltage supply end inside the IC chip 120 is a voltage higher than the voltage input to the power input pin after being boosted by the boost circuit inside the IC chip. During the use of LED display devices, due to the infiltration of water vapor, metal migration is easily caused. If the LED light-emitting chip is reversely conductive, it may cause a short circuit inside the display device during use, burning the display device. In the embodiment of the utility model, the reverse current detection can be performed on the LED display device before leaving the factory. Specifically, the reverse voltage output circuit inside the IC chip 120 provides a reverse voltage to the LED light-emitting chip of the LED display device, and then an external current detection device is used to detect whether there is a reverse current in the LED display device. If there is, or the reverse current is greater than a preset value, the LED display device is determined to be defective and is prevented from entering the subsequent process flow, thereby avoiding the problem of internal short circuit of the display device and burning of the display device due to reverse conduction of the LED light-emitting chip during use, thereby improving product quality and safety of use.

[0088] Figure 7 A schematic diagram of a reverse voltage output circuit provided by an embodiment of the utility model, such as Figure 7 As shown, the reverse voltage output circuit includes a first resistor R1, a second resistor R2 and n transistors, namely Q1 to Qn.

[0089] The first end of the first resistor R1 is electrically connected to the voltage supply terminal Vc inside the IC chip, and the second end of the first resistor R1 is connected in series with the first transistor Q1 to the n-1th transistor Qn-1 in sequence, wherein the collector of the first transistor Q1 is connected to the second end of the first resistor R1, the emitter of the n-1th transistor Qn-1 is grounded, and the bases of the first transistor Q1 to the n-1th transistor Qn-1 are all electrically connected to the collector.

[0090] The collector of the nth transistor Qn is electrically connected to the voltage supply terminal Vc inside the IC chip, the emitter of the nth transistor Qn is connected to the first end of the second resistor R2, the second end of the second resistor R2 is grounded, the base of the nth transistor Qn is connected to the collector of the first transistor Q1, and the emitter of the nth transistor Qn serves as the output terminal Vo of the reverse voltage output circuit.

[0091] Figure 8 for Figure 7 The equivalent circuit of the reverse voltage output circuit is as follows: Figure 8 As shown, when reverse current detection is required, a mode selection signal is input to the data input pin DI of the IC chip to make the IC chip work in the reverse current detection mode. In the reverse current detection mode, the internal circuit of the IC chip boosts the input power supply voltage and provides it to the reverse voltage output circuit through the voltage supply terminal Vc. Each transistor is turned on. Since the voltage Vbe between the base and emitter of the transistor is slightly affected by the base current Ib, it remains unchanged at about 0.7V after being turned on. After the base and collector of the transistor are short-circuited, the first transistor Q1 to the n-1th transistor Qn-1 are equivalent to n-1 series diodes, and the nth transistor Qn acts as an emitter follower to promote the output. At this time, the voltage at the output terminal Vo of the reverse voltage output circuit is (n-1)×Vbe, and Vbe is the voltage drop between the base and emitter of the transistors from the first transistor Q1 to the n-1th transistor Qn-1, that is, the voltage drop of the equivalent diode.

[0092] In some embodiments of the utility model, the IC chip also includes a constant current drive circuit, the power input pin VDD of the IC chip is connected to the anode of the LED light-emitting chip, the cathode of the LED light-emitting chip is connected to the first end of the constant current drive circuit, the second end of the constant current drive circuit is grounded, and the control end of the constant current drive circuit is connected to the data input pin of the IC chip. The IC chip controls the operation of the constant current drive circuit through the data signal input by the data input pin, and provides a constant drive current to the LED light-emitting chip.

[0093] Fig. 9 A schematic diagram of a constant current drive circuit provided by an embodiment of the utility model is shown as follows: Fig. 9 As shown, the constant current driving circuit includes a first transistor M1, a second transistor M2 and a third resistor R3.

[0094] The first end of the first transistor M1 is connected to the cathode of the LED light-emitting chip, the second end of the first transistor M1 is connected to the first end of the third resistor R3, the second end of the third resistor R3 is grounded, and the control end of the first transistor M1 is connected to the data input pin DI of the IC chip through the resistor R4.

[0095] A first end of the second transistor M2 is connected to the control end of the first transistor M1 , a second end of the second transistor M2 is grounded, and the control end of the second transistor M2 is connected to a first end of the third resistor R3 .

[0096] For example, the power input pin VDD of the IC chip provides the working voltage for the LED light emitting chip. After receiving the data signal, the data signal controls the first transistor M1 to maintain a certain opening, thereby controlling the current of the LED light emitting chip to maintain constant. By adjusting the opening of the first transistor M1 by the data signal, the current of the LED light emitting chip can be adjusted, thereby adjusting the brightness of the LED light emitting chip.

[0097] Fig.10 A top view of another LED display device provided by an embodiment of the utility model, Fig.11 for Fig.10 The bottom view of the LED display device is shown in Fig.10 , Fig.11 As shown, the LED display device includes:

[0098] The three LED light emitting chips, namely a red light emitting chip 211, a green light emitting chip 212 and a blue light emitting chip 213, emit red light, green light and blue light respectively.

[0099] IC chip 220, IC chip 220 is electrically connected to the LED light emitting chip, and is used to drive the LED light emitting chip to emit light. Exemplarily, IC chip 220 receives externally transmitted data signals, controls at least one of the three LED light emitting chips to emit light, and controls the light brightness.

[0100] The circuit board 230, the LED light emitting chip and the IC chip 220 are arranged on one side of the circuit board 230, and the circuit board 230 is electrically connected to the LED light emitting chip and the IC chip 220 through internal circuits, and is used to transmit external electrical signals to the LED light emitting chip and the IC chip 220. Exemplarily, the external electrical signals may include power signals, ground signals, data signals, etc. The power signal is used to provide the power supply voltage required by the LED light emitting chip and the IC chip 220, the ground signal is used to ground the LED light emitting chip and the IC chip 220, and the data signal is used to control the light emission of the LED light emitting chip and the brightness of the light emission.

[0101] The packaging glue is arranged on the circuit board 230 and covers the LED light emitting chip and the IC chip 220. The packaging glue is used to fix the LED light emitting chip and the IC chip 220, and can also protect the LED light emitting chip and the IC chip 220 from external moisture.

[0102] Among them, at least two LED light-emitting chips are arranged in a straight line. Exemplarily, the centers of the three LED light-emitting chips are on the same straight line L, and the straight line L coincides with one of the midlines of the circuit board 230, that is, the LED light-emitting chip is located in the middle of the circuit board 230. This embodiment has the same effect as the above embodiment, and this embodiment will not be repeated here.

[0103] The circuit board includes a die bonding pad 231, a core bonding pad 232, a data input pad 2331, a data input pad 2332 and a data output pad 234, and the IC chip 220 includes a data input pin DI0, a data input pin DI1, a data output pin DO, at least two LED signal output pins (exemplarily, in the embodiment of the present utility model, including three LED signal output pins, respectively O R , O G and O B ), power input pin VDD and ground pin GND.

[0104] The three LED light-emitting chips are all fixed on the die bonding pad 231, and the anode of the LED light-emitting chip is electrically connected to the die bonding pad 231, and the die bonding pad 231 is electrically connected to the power input pin VDD of the IC chip 220. Exemplarily, in the embodiment of the present utility model, the red light-emitting chip 211 is a vertical chip, the green light-emitting chip 212 and the blue light-emitting chip 213 are upright chips, the anode and cathode of the upright chip are both located on the light-emitting surface of the upright chip, and the anode and cathode of the vertical chip are respectively located on the light-emitting surface and the backlight surface of the vertical chip. The anode of the red light-emitting chip 211 is fixed on the die bonding pad 231 by a conductive material (for example, conductive glue or solder paste) to achieve electrical connection, and the anodes of the green light-emitting chip 212 and the blue light-emitting chip 213 are respectively electrically connected to the die bonding pad 231 by metal leads. It should be noted that in other embodiments of the present utility model, the LED light-emitting chip can also be other types of light-emitting chips, and accordingly, the pad arrangement can be adjusted accordingly according to the type of the light-emitting chip, and the embodiment of the present utility model is not limited here. In addition, in other embodiments of the present invention, a die-bonding pad may be separately provided for each light-emitting chip, and the embodiments of the present invention are not limited thereto.

[0105] In the embodiment of the utility model, the red light-emitting chip 211 is located between the green light-emitting chip 212 and the blue light-emitting chip 213. This is because the human eye is more sensitive to red light. By setting the red light-emitting chip 211 between the green light-emitting chip 212 and the blue light-emitting chip 213, the color deviation of the red light can be reduced.

[0106] IC chip 220 is fixed on the core pad 232 by insulating glue, and the core pad 232 is electrically connected to the ground pin GND of IC chip 220. Data input pad 2331 is electrically connected to data input pin DI0 of IC chip 220, data input pad 2332 is electrically connected to data input pin DI1 of IC chip 220, and data output pad 234 is electrically connected to data output pin DO of IC chip 220. The cathode of red light emitting chip 211 is electrically connected to signal output pin O of IC chip 220. RThe cathode of the green light emitting chip 212 is electrically connected to the signal output pin O of the IC chip 220 through a metal wire. G The cathode of the blue light emitting chip 213 is electrically connected to the signal output pin O of the IC chip 220 through a metal wire. B Electrically connected via metal wires.

[0107] A data input pin 2351, a data input pin 2352, a data output pin 236, a power input pin 237 and a ground pin 238 are provided on the side of the circuit board 230 away from the LED light-emitting chip. The data input pin 2351 passes through the circuit board 230 through the metal via H5, and is electrically connected to the data input pad 2331 through the line on the circuit board 230. The data input pin 2352 is electrically connected to the data input pad 2332 through the metal via H6 passing through the circuit board 230. The data output pin 236 passes through the circuit board 230 through the metal via H7, and is electrically connected to the data output pad 234 through the line on the circuit board 230. The power input pin 237 is electrically connected to the die-bonding pad 231 through the metal via H8 passing through the circuit board 230. The ground pin 238 is electrically connected to the die-bonding pad 232 through the metal via H9 passing through the circuit board 230.

[0108] In some embodiments of the present invention, Fig.11 As shown, a dangling pin NC is provided on the side of the circuit board 230 away from the LED light-emitting chip, and the pins on the circuit board 230 are symmetrically arranged to improve the stability of the LED display device during the fixing process. Fig.11 As shown, two data input pins are located on the first edge of the circuit board 230 away from the LED light-emitting chip, one data input pin 2351 is adjacent to the third edge and is spaced a preset distance from the third edge, and the other data input pin 2352 is adjacent to the fourth edge and is spaced a preset distance from the fourth edge, wherein the third edge and the fourth edge are opposite. The data output pin 236 and the suspended pin NC are located on the second edge opposite to the first edge, wherein the data output pin 236 is adjacent to the third edge and is spaced a preset distance from the third edge, and the suspended pin NC is adjacent to the fourth edge and is spaced a preset distance from the fourth edge. The power input pin 237 is located in the middle of the third edge, and the ground pin 238 is located in the middle of the fourth edge.

[0109] In some embodiments of the present invention, Fig.11 As shown, an indicator ink P for indicating the fixing direction of the LED display device is provided on one side of the circuit board 230 away from the LED light-emitting chip. During the process of fixing the LED display device, the fixing direction of the LED display device can be determined according to the indicator ink P.

[0110] Exemplarily, the power input pin 237 is used to access the power signal, and to supply power to the power input pin VDD of the IC chip 220 through the die bonding pad 231, and to supply power to the anode of each LED light-emitting chip. The data input pin 2351 is used to access the first data signal, and to provide the first data signal to the data input pin DI0 of the IC chip 220 through the data input pad 2331. The data input pin 2352 is used to access the second data signal, and to provide the second data signal to the data input pin DI1 of the IC chip 220 through the data input pad 2332. The first data signal and the second data signal can be the same data signal, and the two are backups for each other. When one of the data signal transmission lines has a problem, the other one serves as a backup to improve the stability of the LED display device. The IC chip 220 analyzes the data signal to obtain an LED display signal, and outputs the LED display signal to the three LED signal output pins O. R , O G , O B The data output pin DO of IC chip 220 provides data signals to the data input pins DI0 and DI1 of the next LED display device through the data output pad 234 and the data output pin 236.

[0111] In this embodiment, the IC chip 220 also includes the reverse voltage output circuit and the constant current driving circuit in the aforementioned embodiment, which will not be described in detail in this embodiment of the utility model.

[0112] Fig.12 A top view of another LED display device provided by an embodiment of the utility model, Fig.13 for Fig.12 The bottom view of the LED display device is shown in Fig.12 , Fig.13 As shown, the LED display device includes:

[0113] The three LED light emitting chips, namely a red light emitting chip 311 , a green light emitting chip 312 and a blue light emitting chip 313 , emit red light, green light and blue light respectively.

[0114] IC chip 320, IC chip 320 is electrically connected to the LED light emitting chip, and is used to drive the LED light emitting chip to emit light. Exemplarily, IC chip 320 receives externally transmitted data signals, controls at least one of the three LED light emitting chips to emit light, and controls the light brightness.

[0115] The circuit board 330, the LED light emitting chip and the IC chip 320 are arranged on one side of the circuit board 330. The circuit board 330 is electrically connected to the LED light emitting chip and the IC chip 320 through internal circuits, and is used to transmit external electrical signals to the LED light emitting chip and the IC chip 320. Exemplarily, the external electrical signals may include power signals, ground signals, data signals, etc. The power signal is used to provide the power supply voltage required by the LED light emitting chip and the IC chip 320, the ground signal is used to ground the LED light emitting chip and the IC chip 320, and the data signal is used to control the light emission of the LED light emitting chip and the brightness of the light emission.

[0116] The packaging glue is arranged on the circuit board 330 and covers the LED light emitting chip and the IC chip 320. The packaging glue is used to fix the LED light emitting chip and the IC chip 320, and can also protect the LED light emitting chip and the IC chip 320 from external moisture.

[0117] Among them, at least two LED light-emitting chips are arranged in a straight line. Exemplarily, the centers of the three LED light-emitting chips are on the same straight line L, and the straight line L coincides with one of the midlines of the circuit board 330, that is, the LED light-emitting chip is located in the middle of the circuit board 330. This embodiment has the same effect as the above embodiment, and this embodiment will not be repeated here.

[0118] The circuit board includes a die bonding pad 331, a core bonding pad 332, a data input pad 3331, a data input pad 3332, a data output pad 334 and a ground pad 339, and the IC chip 320 includes a data input pin DI0, a data input pin DI1, a data output pin DO, at least two LED signal output pins (exemplarily, in the embodiment of the present utility model, including three LED signal output pins, respectively O R , O G and O B ), power input pin VDD and ground pin GND.

[0119] The three LED light-emitting chips are all fixed on the die bonding pad 331, and the anode of the LED light-emitting chip is electrically connected to the die bonding pad 331, and the die bonding pad 331 is electrically connected to the power input pin VDD of the IC chip 320. Exemplarily, in the embodiment of the present utility model, the red light-emitting chip 311 is a vertical chip, the green light-emitting chip 312 and the blue light-emitting chip 313 are upright chips, the anode and cathode of the upright chip are both located on the light-emitting surface of the upright chip, and the anode and cathode of the vertical chip are respectively located on the light-emitting surface and the backlight surface of the vertical chip. The anode of the red light-emitting chip 311 is fixed on the die bonding pad 331 by a conductive material (for example, conductive glue or solder paste) to achieve electrical connection, and the anodes of the green light-emitting chip 312 and the blue light-emitting chip 313 are respectively electrically connected to the die bonding pad 331 by metal leads. It should be noted that in other embodiments of the present utility model, the LED light-emitting chip can also be other types of light-emitting chips, and accordingly, the pad arrangement can be adjusted accordingly according to the type of the light-emitting chip, and the embodiment of the present utility model is not limited here. In addition, in other embodiments of the present invention, a die-bonding pad may be separately provided for each light-emitting chip, and the embodiments of the present invention are not limited thereto.

[0120] In the embodiment of the utility model, the red light-emitting chip 311 is located between the green light-emitting chip 312 and the blue light-emitting chip 313. This is because the human eye is more sensitive to red light. By setting the red light-emitting chip 311 between the green light-emitting chip 312 and the blue light-emitting chip 313, the color deviation of the red light can be reduced.

[0121] IC chip 320 is fixed on the core pad 332 by insulating glue, data input pad 3331 is electrically connected to data input pin DI0 of IC chip 320, data input pad 3332 is electrically connected to data input pin DI1 of IC chip 320, and data output pad 334 is electrically connected to data output pin DO of IC chip 320. R The cathode of the green light emitting chip 312 is electrically connected to the signal output pin O of the IC chip 320 through a metal wire. G The cathode of the blue light emitting chip 313 is electrically connected to the signal output pin O of the IC chip 320 through a metal wire. B Electrically connected via metal wires.

[0122] A data input pin 3351, a data input pin 3352, a data output pin 336, a power input pin 337 and a ground pin 338 are provided on the side of the circuit board 330 away from the LED light-emitting chip. The data input pin 3351 penetrates the circuit board 330 through the metal via H10, and is electrically connected to the data input pad 3331 through the circuit on the circuit board 330. The data input pin 3352 is electrically connected to the data input pad 3332 through the metal via H11 penetrating the circuit board 330. The data output pin 336 penetrates the circuit board 330 through the metal via H12, and is electrically connected to the data output pad 334 through the circuit on the circuit board 330. The power input pin 337 penetrates the circuit board 330 through the metal via H13, and is electrically connected to the die bonding pad 331 through the circuit on the circuit board 330. The ground pin 338 penetrates the circuit board 330 through the metal via H14, and is electrically connected to the ground pad 339 through the circuit on the circuit board 330.

[0123] In some embodiments of the present invention, Fig.13 As shown, a dangling pin NC is arranged on one side of the circuit board 330 away from the LED light-emitting chip, and the pins on the circuit board 330 are arranged symmetrically to improve the stability of the LED display device during the fixing process. Fig.13 As shown, two data input pins and a power input pin 337 are located at the first edge of the circuit board 330 on the side away from the LED light-emitting chip, one data input pin 3351 is located in the middle of the first edge, the other data input pin 3352 is located at the corner formed by the first edge and the fourth edge, and the power input pin 337 is located at the corner formed by the first edge and the third edge, wherein the third edge and the fourth edge are opposite. The ground pin 338, the suspended pin NC and the data output pin 336 are located at the second edge opposite to the first edge, wherein the suspended pin NC is located in the middle of the second edge, the data output pin 336 is located at the corner formed by the second edge and the third edge, and the ground pin 338 is located at the corner formed by the second edge and the fourth edge.

[0124] In some embodiments of the present invention, Fig.13 As shown, an indicator ink P for indicating the fixing direction of the LED display device is provided on one side of the circuit board 330 away from the LED light-emitting chip. During the process of fixing the LED display device, the fixing direction of the LED display device can be determined according to the indicator ink P.

[0125] Exemplarily, the power input pin 337 is used to access the power signal, and to supply power to the power input pin VDD of the IC chip 320 through the die bonding pad 331, and to supply power to the anode of each LED light-emitting chip. The data input pin 3351 is used to access the first data signal, and to provide the first data signal to the data input pin DI0 of the IC chip 320 through the data input pad 3331. The data input pin 3352 is used to access the second data signal, and to provide the second data signal to the data input pin DI1 of the IC chip 320 through the data input pad 3332. The first data signal and the second data signal can be the same data signal, and the two are backups for each other. When one of the data signal transmission lines has a problem, the other one serves as a backup to improve the stability of the LED display device. The IC chip 320 analyzes the data signal to obtain an LED display signal, and outputs the LED display signal to the three LED signal output pins O. R , O G , O B The data output pin DO of IC chip 320 provides data signals to the data input pins DI0 and DI1 of the next LED display device through the data output pad 334 and the data output pin 336.

[0126] In this embodiment, the IC chip 320 also includes the reverse voltage output circuit and the constant current drive circuit in the aforementioned embodiment, which will not be described in detail in this embodiment of the utility model.

[0127] The embodiment of the utility model further provides a display device, comprising a plurality of LED display devices as provided in any of the foregoing embodiments of the utility model, and further comprising a drive controller, wherein the drive controller comprises a plurality of output terminals;

[0128] The plurality of LED display devices are divided into a plurality of groups of devices corresponding to the plurality of groups of output terminals, and each group of devices includes N LED display devices connected in series;

[0129] A group of devices is electrically connected to a group of output terminals corresponding to the driving controller.

[0130] Fig.14 A schematic diagram of the structure of a display device provided by an embodiment of the utility model, Fig.15 for Fig.14 The circuit structure diagram of the display device is shown in FIG. Figure 3-Figure 5 The LED display device in the example is used as an example to illustrate Fig.14 , Fig.15As shown, the LED display device includes a plurality of LED display devices 100 and a driving controller 300. The driving controller 300 includes M groups of output terminals, and the plurality of LED display devices are divided into M groups of devices corresponding to the M groups of output terminals, and each group of devices includes N LED display devices 100 connected in series. In the embodiment of the utility model, only one group of devices is shown for ease of understanding, and the remaining groups of devices are not shown.

[0131] Each group of output terminals of the driving controller 300 includes a data output terminal Di, that is, the driving controller 300 includes M data output terminals Di. Each data output terminal Di is connected to a group of devices. Specifically, the data output terminal Di is connected to the data input pin 135 of the first LED display device 100 in a group of devices, that is, connected to the data input pin DI of the IC chip 120, and the data output pin 136 of the first LED display device 100 is connected to the data input pin 135 of the next LED display device 100, that is, the data output pin DO of the IC chip 120 in the first LED display device 100 is connected to the data input pin DI of the IC chip 120 of the next LED display device 100, so as to realize the series connection of multiple LED display devices. Of course, each group of output terminals of the driving controller 300 can also include a power output terminal, and the power input pins 137 of all LED display devices in a group of devices are connected to the power output terminal, that is, the power input pins VDD of the IC chips 120 of all LED display devices in a group of devices are connected to the power output terminal.

[0132] Fig.16 A schematic diagram of the structure of another display device provided by an embodiment of the utility model, Fig.17 for Fig.16 The circuit structure diagram of the display device is shown in FIG. Fig.10 , Fig.11 The LED display device in the example is used as an example to illustrate Fig.16 , Fig.17 As shown, the LED display device includes a plurality of LED display devices 200 and a driving controller 300. The driving controller 300 includes M groups of output terminals, and the plurality of LED display devices are divided into M groups of devices corresponding to the M groups of output terminals, and each group of devices includes N LED display devices 200 connected in series. In the embodiment of the utility model, only one group of devices is shown for ease of understanding, and the remaining groups of devices are not shown.

[0133] Each group of output terminals of the driving controller 300 includes a data output terminal Di, that is, the driving controller 300 includes M data output terminals Di. Each data output terminal Di is connected to a group of devices. Specifically, in each group of devices, a data input pin 2351 of the first LED display device 200 is connected to the data output terminal Di in the corresponding first group of output terminals, another data input pin 2352 of the first LED display device 200 is suspended, the data output pin 236 of the Kth LED display device 200 is electrically connected to the data input pin 2351 of the K+1th LED display device 200, and the data output pin 236 of the Kth LED display device 200 is electrically connected to the data input pin 2352 of the K+2th LED display device 200, wherein N≥3, 1≤K≤N. That is, in each group of devices, the data input pin DI0 of the IC chip 220 in the first LED display device 200 is connected to the data output terminal Di in the corresponding first group of output terminals, the data input pin DI1 of the IC chip 220 in the first LED display device 200 is suspended, the data output pin DO of the IC chip 220 in the Kth LED display device 200 is electrically connected to the data input pin DI0 of the IC chip 220 in the K+1th LED display device 200, and the data output pin of the IC chip 220 in the Kth LED display device 200 is electrically connected to the data input pin DI1 of the IC chip 220 in the K+2th LED display device 200, wherein N≥3, 1≤K≤N. Exemplarily, the data output pin DO of the IC chip 220 in the second LED display device 200 is electrically connected to the data input pin DI0 of the IC chip 220 in the third LED display device 200 , and the data output pin DO of the IC chip 220 in the second LED display device 200 is electrically connected to the data input pin DI1 of the IC chip 220 in the fourth LED display device 200 .

[0134] Through the above connection method, in a group of devices, when the K+1th LED display device 200 fails and its data output pin 236 cannot output the data signal to the data input pin 2351 of the K+2th LED display device 200, the K+2th LED display device 200 can receive the data signal from the data output pin 236 of the Kth LED display device 200 through the data input pin 2352, thereby avoiding the situation where the failure of one of the LED display devices causes the entire group of devices to fail to work, thereby improving the stability of the LED display device.

[0135] Fig.18 A schematic diagram of another display device provided in an embodiment of the utility model. Fig.12 , Fig.13The LED display device in the embodiment is used as an example to illustrate the connection relationship and circuit structure of the LED display device in the display device in the embodiment. Fig.16 and Fig.17 The embodiments of the present invention are similar to those in the embodiments of the present invention, and the embodiments of the present invention will not be described in detail here.

[0136] In the description of this article, it is necessary to understand that the terms "up", "down", "left", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0137] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0138] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0139] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. An LED display device, characterized in that: include: At least two LED light-emitting chips; An IC chip, the IC chip is electrically connected to the LED light-emitting chip and is used to drive the LED light-emitting chip to emit light; A circuit board, the LED light emitting chip and the IC chip are arranged on one side of the circuit board, the circuit board is electrically connected to the LED light emitting chip and the IC chip through internal circuits, and is used to transmit external electrical signals to the LED light emitting chip and the IC chip; Packaging glue, the packaging glue is arranged on the circuit board and covers the LED light-emitting chip and the IC chip; The at least two LED light-emitting chips are arranged in a straight line, and the straight line coincides with one of the center lines of the circuit board.

2. The LED display device according to claim 1, characterized in that: The circuit board includes a die-bonding pad, a core-bonding pad, a data input pad, and a data output pad, and the IC chip includes a data input pin, a data output pin, at least two LED signal output pins, a power input pin, and a ground pin; The LED light emitting chip is fixed on the die bonding pad, and the anode of the LED light emitting chip is electrically connected to the die bonding pad, and the die bonding pad is electrically connected to the power input pin of the IC chip; The IC chip is fixed on the core fixing pad, and the core fixing pad is electrically connected to the ground pin of the IC chip; The data input pad is electrically connected to the data input pin of the IC chip; The data output pad is electrically connected to the data output pin of the IC chip; The cathodes of the at least two LED light-emitting chips are electrically connected to the at least two LED signal output pins of the IC chip accordingly.

3. The LED display device according to claim 2, characterized in that: A data input pin, a data output pin, a power input pin and a ground pin are provided on the side of the circuit board away from the LED light-emitting chip. The data input pin is electrically connected to the data input pad, the data output pin is electrically connected to the data output pad, the power input pin is electrically connected to the die bonding pad, and the ground pin is electrically connected to the core bonding pad.

4. The LED display device according to claim 2, characterized in that: The circuit board includes a die-bonding pad, a core-bonding pad, a data input pad, a data output pad, and a ground pad, and the IC chip includes a data input pin, a data output pin, at least two LED signal output pins, a power input pin, and a ground pin; The LED light emitting chip is fixed on the die bonding pad, and the anode of the LED light emitting chip is electrically connected to the die bonding pad, and the die bonding pad is electrically connected to the power input pin of the IC chip; The IC chip is fixed on the core fixing pad; The data input pad is electrically connected to the data input pin of the IC chip; The data output pad is electrically connected to the data output pin of the IC chip; The ground pad is electrically connected to the ground pin of the IC chip; The cathodes of the at least two LED light-emitting chips are electrically connected to the at least two LED signal output pins of the IC chip accordingly.

5. The LED display device according to claim 4, characterized in that: A data input pin, a data output pin, a power input pin and a ground pin are provided on a side of the circuit board away from the LED light-emitting chip. The data input pin is electrically connected to the data input pad, the data output pin is electrically connected to the data output pad, the power input pin is electrically connected to the die bonding pad, and the ground pin is electrically connected to the ground pad.

6. The LED display device according to claim 3 or 5, characterized in that: The circuit board includes two data input pads and two data input pins, the IC chip includes two data input pins, the data input pad is electrically connected to a corresponding data input pin, and the data input pin is electrically connected to a corresponding data input pad.

7. The LED display device according to claim 6, characterized in that: A suspended pin is provided on one side of the circuit board away from the LED light-emitting chip, two data input pins are located on a first edge of the circuit board on one side away from the LED light-emitting chip, one of the data input pins is adjacent to the third edge and is spaced a preset distance from the third edge, and the other data input pin is adjacent to the fourth edge and is spaced a preset distance from the fourth edge, wherein the third edge and the fourth edge are opposite; The data output pin and the suspended pin are located at a second edge opposite to the first edge, wherein the data output pin is adjacent to a third edge and is spaced a preset distance from the third edge, and the suspended pin is adjacent to a fourth edge and is spaced a preset distance from the fourth edge; The power input pin is located in the middle of the third edge, and the ground pin is located in the middle of the fourth edge.

8. The LED display device according to claim 6, characterized in that: A suspended pin is arranged on one side of the circuit board away from the LED light emitting chip, two data input pins and the power input pin are located at a first edge of the circuit board on one side away from the LED light emitting chip, one of the data input pins is located in the middle of the first edge, the other data input pin is located at a corner formed by the first edge and the fourth edge, and the power input pin is located at a corner formed by the first edge and the third edge, wherein the third edge and the fourth edge are opposite; The ground pin, the suspended pin and the data output pin are located at a second edge opposite to the first edge, wherein the suspended pin is located in the middle of the second edge, the data output pin is located at a corner formed by the second edge and the third edge, and the ground pin is located at a corner formed by the second edge and the fourth edge.

9. The LED display device according to any one of claims 1-5, 7 and 8, characterized in that: Indicating ink for indicating the fixing direction of the LED display device is arranged on a side of the circuit board away from the LED light emitting chip.

10. The LED display device according to any one of claims 1-5, 7, and 8, characterized in that: The LED display device comprises three LED light-emitting chips, namely a red light-emitting chip, a green light-emitting chip and a blue light-emitting chip, wherein the red light-emitting chip is located between the green light-emitting chip and the blue light-emitting chip.

11. The LED display device according to any one of claims 1-5, 7, and 8, characterized in that: The IC chip includes a reverse voltage output circuit, the input end of the reverse voltage output circuit is electrically connected to the voltage supply end inside the IC chip, the output end of the reverse voltage output circuit is electrically connected to the cathode of the LED light-emitting chip, and the reverse voltage output circuit is used to output a reverse voltage to the LED light-emitting chip.

12. The LED display device according to claim 11, characterized in that: The reverse voltage output circuit comprises a first resistor, a second resistor and n transistors; The first end of the first resistor is electrically connected to the voltage supply end inside the IC chip, and the second end of the first resistor is connected in series with the first to n-1th transistors in sequence, wherein the collector of the first transistor is connected to the second end of the first resistor, the emitter of the n-1th transistor is grounded, and the bases of the first to n-1th transistors are all electrically connected to the collector; The collector of the nth transistor is electrically connected to the voltage supply end inside the IC chip, the emitter of the nth transistor is connected to the first end of the second resistor, the second end of the second resistor is grounded, the base of the nth transistor is connected to the collector of the first transistor, and the emitter of the nth transistor serves as the output end of the reverse voltage output circuit.

13. The LED display device according to any one of claims 1-5, 7, and 8, characterized in that: The IC chip includes a constant current drive circuit, the power input pin of the IC chip is connected to the anode of the LED light-emitting chip, the cathode of the LED light-emitting chip is connected to the first end of the constant current drive circuit, the second end of the constant current drive circuit is grounded, and the control end of the constant current drive circuit is connected to the data input pin of the IC chip. The IC chip controls the operation of the constant current drive circuit through the data signal input by the data input pin, and provides a constant drive current to the LED light-emitting chip.

14. The LED display device according to claim 13, characterized in that: The constant current driving circuit comprises a first transistor, a second transistor and a third resistor; The first end of the first transistor is connected to the cathode of the LED light emitting chip, the second end of the first transistor is connected to the first end of the third resistor, the second end of the third resistor is grounded, and the control end of the first transistor is connected to the data input pin of the IC chip; The first end of the second transistor is connected to the control end of the first transistor, the second end of the second transistor is grounded, and the control end of the second transistor is connected to the first end of the third resistor.

15. A display device, characterized in that: The device comprises a plurality of LED display devices according to any one of claims 1 to 14, and further comprises a driving controller, wherein the driving controller comprises a plurality of groups of output terminals; The plurality of LED display devices are divided into a plurality of groups of devices corresponding to the plurality of groups of output terminals, each group of devices comprising N LED display devices connected in series; A group of devices is electrically connected to a group of output terminals corresponding to the drive controller.

16. The display device according to claim 15, characterized in that The LED display device comprises a first data input pin, a second data input pin, and a data output pin; Each group of output terminals of the driving controller includes a data output terminal; In each group of devices, the second data input pin of the first LED display device is connected to the data output end of the corresponding group of output ends, the first data input pin of the first LED display device is suspended, the data output pin of the Kth LED display device is electrically connected to the second data input pin of the K+1th LED display device, and the data output pin of the Kth LED display device is electrically connected to the first data input pin of the K+2th LED display device, wherein N≥3, 1≤K≤N.

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