LED display screen with small-size driving chip

Abstract

The utility model discloses a light-emitting diode (LED) display screen with small-size driving chips, which comprises a circuit board, a plurality of light-transmitting through holes are arranged on the circuit board, a plurality of rows of LED lamp beads are arranged on the front side of the circuit board, a plurality of driving chips are arranged on the back side of the circuit board, each driving chip is used for driving one row of LED lamp beads to work, and the driving chips are used for driving one row of LED lamp beads to work. The LED lamp beads and the driving chips are located between the adjacent light-transmitting through holes, each driving chip is hidden on the back face of one LED lamp bead, the specification of each driving chip is smaller than 2.5 mm * 2.5 mm, cost can be reduced, and the transparent effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of LED display screens, in particular to an LED display screen with a small-volume driving chip. Background Art

[0002] In recent years, transparent LED display screens have been extremely popular in shopping malls, specialty stores, and stage background applications. In particular, fully transparent, frameless transparent screen solutions are experiencing a market explosion and are receiving much attention.

[0003] There are currently three solutions for realizing transparent LED displays:

[0004] (1) The solution of integrated lamp and driver: This solution is to encapsulate the control chip driving the RGB full color inside the lamp bead, so that the color pattern can be displayed without the need for peripheral devices, the circuit board design is simple, and the transparency is high;

[0005] However, because the driver chip is encapsulated inside the lamp bead, the packaging cost is too high and the project is difficult to implement. In addition, because the chip is encapsulated in a small lamp bead, the light-emitting position and brightness of the internal chip are affected, affecting the display effect. In addition, the large number of chips increases the power consumption of the whole machine. Because the chip uses a single signal line to transmit full-color patterns, the data transmission rate is generally not high, which limits the number of pixels carried by a single signal line to about 400 points. A high-density display screen has 256x256 points per square = 65536 points, so 64x4 = 256 signal lines are required for control, and the reliability of its connection is greatly reduced.

[0006] (2) The grid bar splicing solution uses a separate light bar to display the light of each row. A complete display screen will be composed of hundreds or thousands of light bars;

[0007] However, because each row is made up of a separate light strip, this will affect the luminous display effect, make the installation complicated, increase the maintenance workload, increase the density of connection contact points, greatly reduce reliability, and increase the cost. However, because there is no good solution in the market, it is currently in the mainstream application stage.

[0008] (3) Traditional chips realize transparent screen solutions to replace the integrated lamp-driver solution. Many traditional LED display companies use mature display technology to replace the high-cost integrated lamp-driver solution mentioned above.

[0009] However, since the LED display realizes the transparent function, it makes the circuit board wiring extremely difficult. It is necessary to concentrate the driving chips at one end. Even if an 8 - 12 - layer circuit board is used, due to the several - fold increase in the manufacturing process difficulty of the long circuit board, the brightness and refresh rate of the display are also greatly reduced. Therefore, a compromise method has emerged, that is, to disperse the driving chips in the middle of the circuit board. Because the volume of traditional chips is too large, some chips need to be placed in the display area, resulting in a significant decline in the transparency effect, and the opaque black dots affect the display effect, which is severely resisted by end - users.

[0010] Therefore, it is necessary to improve the problems existing in the background technology. Utility Model Content

[0011] The present utility model aims to solve at least one of the problems existing in the related prior art to some extent. For this reason, the present utility model provides an LED display with a small - volume driving chip, which can reduce costs and ensure the transparency effect.

[0012] The above object is achieved by the following technical solutions:

[0013] An LED display with a small - volume driving chip includes a circuit board. A plurality of light - passing through holes are provided on the circuit board. A plurality of columns of LED lamp beads are provided on the front of the circuit board. A plurality of driving chips are provided on the back of the circuit board. Each driving chip is used to drive a column of the LED lamp beads to work. The LED lamp beads and the driving chips are both located between adjacent light - passing through holes, and each driving chip is hidden behind one of the LED lamp beads. The specification of the driving chip is less than 2.5mm * 2.5mm.

[0014] In some embodiments, the driving chip only has 3 constant - current output terminals, which are used to control a column of LED lamp beads to emit red light, green light, and / or blue light.

[0015] In some embodiments, the driving chip has a serial data input terminal, a serial clock input terminal, a latch terminal for data and instructions, a line - feed signal terminal, a serial data output terminal, a chip power supply terminal, and a chip ground terminal.

[0016] In some embodiments, the driving chip includes an instruction processing module, a register configuration module, a grayscale generation module, a display buffer module, a data mapping module, a shift register module, and a 3-channel constant current output module. Among them, the instruction processing module, the register configuration module, the grayscale generation module, and the 3-channel constant current output module are connected in sequence. The instruction processing module is respectively connected to the display buffer module and the data mapping module. The shift register module, the data mapping module, the display buffer module, the grayscale generation module, and the 3-channel constant current output module are connected in sequence.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] 1. The present invention provides an LED display screen with a driving chip of small volume, which can reduce costs and ensure a transparent effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front schematic view of the circuit board in the embodiment;

[0020] Figure 2 It is a back schematic view of the circuit board in the embodiment;

[0021] Figure 3 It is a structural schematic view of the driving chip in the embodiment;

[0022] Figure 4 It is the internal circuit diagram of the driving chip in the embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following embodiments are used to illustrate the present invention, but the present invention is not limited by these embodiments. Modifying the specific implementation manner of the present invention or equivalently replacing some technical features without departing from the spirit of the solution of the present invention shall all be covered within the scope of the technical solution claimed by the present invention.

[0024] Embodiment 1: As Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown in the figure, this embodiment provides an LED display screen with a small-size driving chip, which includes a circuit board 1. A plurality of light-transmitting through holes 100 are provided on the circuit board 1. A plurality of columns of LED lamp beads 2 are arranged on the front surface of the circuit board 1, and a plurality of driving chips 3 are arranged on the back surface of the circuit board 1. Each driving chip 3 is used to drive one column of the LED lamp beads 2 to work. The LED lamp beads 2 and the driving chips 3 are both located between adjacent light-transmitting through holes 100, and each driving chip 3 is hidden behind one of the LED lamp beads 2. The specification of the driving chip 3 is less than 2.5mm * 2.5mm.

[0025] The LED display screen with a small-size driving chip provided in this embodiment can reduce costs and ensure a transparent effect.

[0026] In view of the problems and disadvantages of the prior art, the technical solution provided in this embodiment uses a mature and low-cost LED display screen technology route to replace the integrated light-driving solution, simplifies the assembly quantity of the grille screen, and improves the transparency, eliminating the black dots caused by the chips. The technical solution provided in this embodiment uses a small-size driving chip hidden behind the light-emitting lamp beads, so that the refresh rate, display brightness can be ensured without affecting the transparency, and the cost can be reduced.

[0027] In the integrated light-driving solution, one chip can only drive one lamp bead. In the technical solution provided in this embodiment, one driving chip can drive one column of lamp beads, greatly reducing the cost of the chips.

[0028] Furthermore, the driving chip 3 only has 3 constant current output terminals, which are used to control one column of the LED lamp beads 2 to emit red light, green light, and / or blue light.

[0029] In this embodiment, the driving chip 3 has a serial data input terminal, a serial clock input terminal, a latch terminal for data and instructions, a line feed signal terminal, a serial data output terminal, a chip power supply terminal, and a chip ground terminal.

[0030] For the traditional opaque display LED display screen, the placement of the chips is not greatly restricted by the circuit board space and is designed into 16 channels to maximize the use of the control signal pins. However, it is not suitable for the semi-transparent circuit board. Only the area the size of the lamp beads on the back can place the driving chips. While increasing the pin pitch, the number of pins needs to be greatly reduced to meet the requirements of this project.

[0031] After a large number of comparison tests and circuit board simulations, it is finally determined that in addition to the basic control signal pins, each driving chip only outputs 3 channels to control the red, green, and blue of one column of lamp beads. In this way, one chip is required for each column of the display screen module, breaking it into parts to meet the requirements of special transparency.

[0032] Further, the driving chip 3 includes an instruction processing module, a register configuration module, a grayscale generation module, a display buffer module, a data mapping module, a shift register module, and a 3-channel constant current output module. Among them, the instruction processing module, the register configuration module, the grayscale generation module, and the 3-channel constant current output module are connected in sequence. The instruction processing module is respectively connected to the display buffer module and the data mapping module. The shift register module, the data mapping module, the display buffer module, the grayscale generation module, and the 3-channel constant current output module are connected in sequence. Its circuit is simpler, more reasonable, has lower cost, and higher stability.

[0033] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the creative concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An LED display screen with a small-sized driving chip, characterized in that: It includes a circuit board (1), on which a number of light-transmitting through holes (100) are provided. On the front of the circuit board (1), a number of columns of LED lamp beads (2) are provided. On the back of the circuit board (1), a number of driving chips (3) are provided. Each driving chip (3) is used to drive a column of the LED lamp beads (2) to work. The LED lamp beads (2) and the driving chips (3) are both located between adjacent light-transmitting through holes (100), and each driving chip (3) is hidden behind one of the LED lamp beads (2). The specification of the driving chip (3) is less than 2.5mm * 2.5mm.

2. The LED display screen with a small-sized driving chip according to claim 1, characterized in that: The driving chip (3) only has 3 constant current output terminals, which are used to control a column of the LED lamp beads (2) to emit red light, green light and / or blue light.

3. The LED display screen with a small-sized driving chip according to claim 2, characterized in that: The driving chip (3) has a serial data input terminal, a serial clock input terminal, a latch terminal for data and instructions, a line feed signal terminal, a serial data output terminal, a chip power supply terminal and a chip ground terminal.

4. An LED display screen with a small-sized driving chip according to claim 1, 2 or 3, characterized in that: The driving chip (3) includes an instruction processing module, a register configuration module, a grayscale generation module, a display buffer module, a data mapping module, a shift register module and a 3-channel constant current output module. Among them, the instruction processing module, the register configuration module, the grayscale generation module and the 3-channel constant current output module are connected in sequence. The instruction processing module is respectively connected to the display buffer module and the data mapping module. The shift register module, the data mapping module, the display buffer module, the grayscale generation module and the 3-channel constant current output module are connected in sequence.

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