Simplified LED display screen circuit structure

Abstract

A simplified LED display screen circuit structure disclosed by the present invention comprises a circuit board and a receiving card, the circuit board is provided with array tube driving chips, row tube driving chips and LED lamp beads in matrix distribution, the plurality of array tube driving chips are connected in series and then are connected with the receiving card through a connector assembly and a socket assembly, and the array tube driving chips are connected with the receiving card through the connector assembly and the socket assembly. The plurality of row tube driving chips are connected in series and then are connected with the receiving card through the connector and the socket assembly; the tube array driving chip at least comprises a tube array data input DIN, a tube array data output DOUT, a tube array power supply VCC, a tube array ground GND and a tube array first output channel OUT1, and the tube array first output channel OUT1 is connected with a corresponding LED lamp bead; the row tube driving chip at least comprises a row tube data input DIN, a row tube data output DOUT, a row tube power supply VCC, a row tube ground GND and a row tube first output channel OUT1, and the row tube first output channel OUT1 is connected with the corresponding LED lamp bead. According to the simplified LED display screen circuit structure provided by the invention, the occupied area of a chip is reduced, and the permeability of the LED display screen is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of LED display screens, and in particular to a simplified circuit structure of an LED display screen. Background Art

[0002] With the development of LED display technology, the pixel density of LED displays is increasing, the dot pitch is decreasing, and the circuit board circuits are becoming more and more complex. The large driver chip solutions currently used in displays have relatively concentrated and dense pins. Placing the driver chip on the back of the circuit board and then arranging the display LEDs on the front is very difficult, and it is becoming increasingly difficult to meet the requirements of new high-density display technologies.

[0003] In recent years, there are more and more new equi-dot-pitch transparent LED display screens on the market. Because transparent screens are made by evenly digging holes in the circuit board to let light in, the gaps between the holes are in a matrix state. In the opaque part of the circuit board, the front and back sides must also be evenly distributed with LED lamp beads and driver chips, which also puts high demands on the layout and wiring of the circuit board.

[0004] However, most existing driver chips have a high number of pins and a large chip area. When the chip size directly exceeds the diameter of the light-transmitting hole, a large number of black spots will appear in the display area. Furthermore, the large number of chip pins makes wiring more complicated. It is difficult to arrange an additional signal line or via. This not only reduces the transparency of the LED display, but also increases the difficulty of circuit board production, making it difficult to improve product yield. Furthermore, unoptimized signal timing will lead to an increase in the number of physically connected signal lines, which not only reduces the reliability of the LED display but also increases the overall cost.

[0005] Therefore, it is necessary to improve the existing LED display circuit structure. Summary of the Invention

[0006] The present invention aims to solve, at least to a certain extent, one of the problems existing in the existing related technologies. To this end, one purpose of the present invention is to provide a simplified LED display circuit structure, which designs and optimizes small-volume chips that can be distributed in the wiring gaps of the display circuit board to improve the transparency of the LED display.

[0007] The above purpose is achieved through the following technical solutions:

[0008] A simplified LED display circuit structure includes a circuit board and a receiving card. Driver chips and LED lamp beads arranged in a matrix are disposed on the circuit board. The driver chips include a plurality of column-type driver chips and a plurality of row-type driver chips. The column-type driver chips are connected in series and connected to the receiving card via a connector and a socket assembly. Similarly, the row-type driver chips are connected in series and connected to the receiving card via a connector and a socket assembly.

[0009] The column tube driver chip at least includes a column tube data input DIN, a column tube data output DOUT, a column tube power supply VCC, a column tube ground GND and a column tube first output channel OUT1. The column tube data input DIN and column tube data output DOUT of two adjacent column tube driver chips are correspondingly connected, and the column tube first output channel OUT1 is connected to the corresponding LED lamp bead;

[0010] The row control driver chip at least includes a row control data input DIN, a row control data output DOUT, a row control power supply VCC, a row control ground GND and a row control first output channel OUT1. The row control data input DIN and the row control data output DOUT of two adjacent row control driver chips are correspondingly connected, and the row control first output channel OUT1 is connected to the corresponding LED lamp bead.

[0011] In some embodiments, the column tube driver chip further includes a column tube second output channel OUT2 and a column tube third output channel OUT3, and the column tube second output channel OUT2 and the column tube third output channel OUT3 are connected to corresponding LED lamp beads.

[0012] In some embodiments, when the number of pins of the column-type tube driver chip is less than or equal to 6, the area of ​​the column-type tube driver chip is less than or equal to 1.6×1.6 mm.

[0013] In some embodiments, when the number of pins of the column-type tube driver chip is less than or equal to 8, the area of ​​the column-type tube driver chip is less than or equal to 2×2 mm.

[0014] In some embodiments, the row tube driver chip further includes a second row tube output channel OUT2, a third row tube output channel OUT3, and a fourth row tube output channel OUT4. The second output channel OUT2, the third row tube output channel OUT3, and the fourth row tube output channel OUT4 are respectively connected to corresponding LED lamp beads.

[0015] In some embodiments, when the number of pins of the row tube driver chip is less than or equal to 6, the area of ​​the row tube driver chip is less than or equal to 1.6×1.6 mm;

[0016] When the number of pins of the row tube driver chip is less than or equal to 8, the area of ​​the row tube driver chip is less than or equal to 2×2 mm.

[0017] In some embodiments, the column tube driver chip and the row tube driver chip may be packaged in a DFN package, a CSP package, a BGA package, or a QFN package.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The present invention provides a simplified LED display circuit structure, which designs and optimizes small-volume chips that can be distributed in the wiring gaps of the display circuit board, thereby improving the transparency of the LED display. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the signal distribution of the existing large-tube driver chip;

[0021] Figure 2 This is a schematic diagram of the signal distribution of the existing large-line tube driver chip;

[0022] Figure 3 This is a schematic diagram of the pin distribution of the column tube driver chip in Example 1;

[0023] Figure 4 This is a schematic diagram of the pin distribution of the row tube driver chip in Example 1;

[0024] Figure 5 This is a schematic diagram of the circuit structure of the LED display screen in Example 1;

[0025] Figure 6 This is a schematic diagram of the circuit structure of the LED display screen in Example 2;

[0026] Figure 7 This is a schematic diagram of the pin distribution of the column tube driver chip in Example 2;

[0027] Figure 8 This is a schematic diagram of the LED display circuit structure in Example 3;

[0028] Figure 9 This is a schematic diagram of the pin distribution of the row tube driver chip in Example 3.

[0029] In the figure: 1. Receiving card; 2. Driver chip; 3. LED lamp bead; 4. Column tube driver chip; 41. Column tube data input DIN; 42. Column tube data output DOUT; 43. Column tube power supply VCC; 44. Column tube ground GND; 45. Column tube first output channel OUT1; 46. Column tube second output channel OUT2; 47. Column tube third output channel OUT3; 5. Row tube driver chip; 51. Row tube data input DIN; 52. Row tube data output DOUT; 53. Row tube power supply VCC; 54. Row tube ground GND; 55. Row tube first output channel OUT1; 56. Row tube second output channel OUT2; 57. Row tube third output channel OUT3; 58. Row tube fourth output channel OUT4. DETAILED DESCRIPTION

[0030] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0031] like Figure 1 As shown in the figure, the signal distribution of the existing LED display large column tube driver chip includes: clock CLK, latch LAT (LE pin in the figure), output enable signal OE (ROW pin in the figure), data input Din (SDI pin in the figure), output Dout (SDO pin in the figure), power supply VDD, ground GND and column output channels OUT0-15, resulting in the column tube driver chip including at least 23 pins.

[0032] like Figure 2 As shown in the figure, the signal distribution of the existing LED display large row tube driver chip includes: data input DataIn (DIN pin in the figure), blanking clock RClock (RCK pin in the figure), data clock DataClock (DCK pin in the figure), data output DataOut (DOUT pin in the figure), power supply VDD, ground GND and row output signals OUT0-7, resulting in the row tube driver chip including at least 16 pins.

[0033] Therefore, the existing design has many pins, which results in a larger driver chip. Therefore, in order to reduce the occupied area of ​​the driver chip, it is necessary to reduce the number of pins of the driver chip.

[0034] like Figure 3-5As shown, Example 1 provides a simplified LED display circuit structure, including a circuit board and a receiving card 1. A driver chip 2 and LED lamp beads 3 distributed in a matrix are provided on the circuit board. The driver chip 2 includes a plurality of column tube driver chips 4 and a plurality of row tube driver chips 5. The plurality of column tube driver chips 4 are connected in series and connected to the receiving card 1 through a connector and a socket assembly, and the plurality of row tube driver chips 5 are connected in series and connected to the receiving card 1 through a connector and a socket assembly.

[0035] The column-mount driver chip 4 includes at least a column-mount data input DIN 41, a column-mount data output DOUT 42, a column-mount power supply VCC 43, a column-mount ground GND 44, and a column-mount first output channel OUT145. The column-mount data input DIN 41 and column-mount data output DOUT 42 of two adjacent column-mount driver chips 4 are connected to each other, and the column-mount first output channel OUT145 is connected to the corresponding LED lamp bead 3. This configuration allows each column-mount output channel OUT1 to illuminate one color for each chip.

[0036] The row-pipe driver chip 5 includes at least a row-pipe data input DIN51, a row-pipe data output DOUT52, a row-pipe power supply VCC53, a row-pipe ground GND54, and a row-pipe first output channel OUT155. The row-pipe data input DIN51 and row-pipe data output DOUT52 of two adjacent row-pipe driver chips 5 are connected to each other, and the row-pipe first output channel OUT155 is connected to the corresponding LED lamp bead 3. This configuration allows each row-pipe output channel OUT1 to output a single row of driving current.

[0037] The present invention provides a simplified LED display circuit structure, which designs and optimizes small-volume chips that can be distributed in the wiring gaps of the display circuit board, thereby improving the transparency of the LED display.

[0038] 6 and Figure 7 As shown, Example 2 provides a simplified LED display circuit structure. The column-tube driver chip 4 also includes a second column-tube output channel OUT246 and a third column-tube output channel OUT347, which are connected to corresponding LED lamp beads 3. This configuration allows the three column-tube output channels OUT1-3 to illuminate one column of three colors (red, green, and blue) for each chip.

[0039] Furthermore, when the number of pins of the column-type transistor driver chip 4 is less than or equal to 6, the area of ​​the column-type transistor driver chip 4 is less than or equal to 1.6 x 1.6 mm. The column-type transistor driver chip 4 is small enough so as not to affect the light transmission effect of the light-transmitting hole of the circuit board.

[0040] Preferably, when the number of pins of the column-type tube driver chip 4 is less than or equal to 8, the area of ​​the column-type tube driver chip 4 is less than or equal to 2 x 2 mm. This ensures that the column-type tube driver chip 4 does not affect the light transmission effect of the light-transmitting hole of the circuit board, and each chip can light up the three red, green and blue colors of one column.

[0041] Furthermore, the row control driver chip 5 also includes a second row control output channel OUT256, a third row control output channel OUT357, and a fourth row control output channel OUT458. The second output channel OUT256, the third row control output channel OUT357, and the fourth row control output channel OUT458 are respectively connected to corresponding LED lamp beads 3. The four row control output channels OUT1-4 can realize four row drive current outputs.

[0042] Figure 8 and Figure 9 The third embodiment shows the specific structure of the LED display circuit when the column tube driver chip 4 has three column tube output channels OUT1-3 and the row tube driver chip 5 has four row output channels OUT1-4.

[0043] In the above embodiments, the individual signal lines of the column driver chip 4 and the row driver chip 5 are further combined into a single signal line for transmission, enabling each local unit to connect to the signal receiving card's transmitting end with only one signal line. This not only reduces the number of pins on the driver chip 2, shrinking the chip footprint, simplifying circuit board wiring, improving the transparency of the LED display, and increasing the density of similar pixels, but also reduces the number of signal connections, simplifies circuit board signal wiring, improves reliability, and reduces production and maintenance costs.

[0044] Specifically, when the number of pins on the row-pipe driver chip 5 is 6 or less, the area of ​​the row-pipe driver chip 5 is 1.6 x 1.6 mm or less. When the number of pins on the row-pipe driver chip 5 is 8 or less, the area of ​​the row-pipe driver chip 5 is 2 x 2 mm or less. This configuration allows for extreme chip miniaturization, efficient heat dissipation, and optimized electrical performance.

[0045] Furthermore, the column-mount driver chip 4 and the row-mount driver chip 5 can be packaged in DFN, CSP, BGA, or QFN packages. DFN is a double-sided flat no-lead package; CSP is an advanced microelectronics packaging technology; BGA is a ball grid array; and QFN is a quad flat no-lead package. These packaging technologies are mainstream chip packaging methods, eliminating the need for manufacturers to specifically seek new packaging methods, thus reducing production costs. Of course, the packaging methods used in the present invention include but are not limited to the above.

[0046] Driver chip optimization principles: Optimizing the column-mount driver chip. First, reduce the number of output channels from the current 16 to 1 or 3 channels, thus eliminating 13 to 15 pins. Next, modify the timing signals of the column-mount driver chip. The clock CLK, latch LAT, and output enable signal OE, commonly used in LED display circuits, are merged into the data pins. The chip retains the input Din and output Dout. Each column of chips is cascaded, and a single signal line transmits display data and control signals. The clock CLK pin is omitted by adding clock recovery logic and circuitry to the chip's data pins that can recover the clock from the data timing. The latch LAT pin is omitted by counting the number of data bits transmitted during the chip's internal data transmission timing. The chip automatically generates a data latch signal. The number of transmitted bits is input during the register parameter stage of the data transmission process. The output enable signal OE is also input during the register parameter stage of the data transmission process, and the chip automatically generates the incoming display data. The optimization strategy for the row-mount driver chip is similar to that for the column-mount driver chip: reducing the number of output channels and modifying the timing signals of the row-mount driver chip.

[0047] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A simplified LED display circuit structure, characterized in that: The invention comprises a circuit board and a receiving card (1), wherein a driving chip (2) and LED lamp beads (3) distributed in a matrix are arranged on the circuit board, wherein the driving chip (2) comprises a plurality of column tube driving chips (4) and a plurality of row tube driving chips (5), wherein the plurality of column tube driving chips (4) are connected in series and connected to the receiving card (1) via a connector and a socket assembly, and wherein the plurality of row tube driving chips (5) are connected in series and connected to the receiving card (1) via a connector and a socket assembly. The column tube driver chip (4) at least comprises a column tube data input DIN (41), a column tube data output DOUT (42), a column tube power supply VCC (43), a column tube ground GND (44) and a column tube first output channel OUT1 (45); the column tube data input DIN (41) and the column tube data output DOUT (42) of two adjacent column tube driver chips (4) are correspondingly connected, and the column tube first output channel OUT1 (45) is connected to the corresponding LED lamp bead (3); The row tube driver chip (5) at least comprises a row tube data input DIN (51), a row tube data output DOUT (52), a row tube power supply VCC (53), a row tube ground GND (54) and a row tube first output channel OUT1 (55). The row tube data input DIN (51) and the row tube data output DOUT (52) of two adjacent row tube driver chips (5) are correspondingly connected, and the row tube first output channel OUT1 (55) is connected to the corresponding LED lamp bead (3).

2. The simplified LED display circuit structure according to claim 1, characterized in that: The column tube driving chip (4) further comprises a column tube second output channel OUT2 (46) and a column tube third output channel OUT3 (47), wherein the column tube second output channel OUT2 (46) and the column tube third output channel OUT3 (47) are connected to corresponding LED lamp beads (3).

3. The simplified LED display circuit structure according to claim 1, characterized in that: When the number of pins of the column-type tube driving chip (4) is less than or equal to 6, the area of ​​the column-type tube driving chip (4) is less than or equal to 1.6×1.6 mm.

4. The simplified LED display circuit structure according to claim 2, characterized in that: When the number of pins of the column tube driving chip (4) is less than or equal to 8, the area of ​​the column tube driving chip (4) is less than or equal to 2×2 millimeters.

5. A simplified LED display circuit structure according to claim 1, 2, 3 or 4, characterized in that: The row tube driver chip (5) further comprises a row tube second output channel OUT2 (56), a row tube third output channel OUT3 (57) and a row tube fourth output channel OUT4 (58); the second output channel OUT2 (56), the row tube third output channel OUT3 (57) and the row tube fourth output channel OUT4 (58) are respectively connected to corresponding LED lamp beads (3).

6. The simplified LED display circuit structure according to claim 5, characterized in that: When the number of pins of the row tube driver chip (5) is less than or equal to 6, the area of ​​the row tube driver chip (5) is less than or equal to 1.6×1.6 mm; When the number of pins of the row tube driver chip (5) is less than or equal to 8, the area of ​​the row tube driver chip (5) is less than or equal to 2×2 millimeters.

7. A simplified LED display circuit structure according to claim 1 or 2, characterized in that: The column tube driver chip (4) and the row tube driver chip (5) can be packaged in the form of DFN packaging, CSP packaging, BGA packaging or QFN packaging.

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