LED red character display panel applied to electronic scale

Abstract

The utility model provides an LED red character display panel applied to an electronic scale. The LED red character display panel comprises a printed circuit board. The display driving chip is arranged on the printed circuit board; the display groups are arranged on the printed circuit board, each display group comprises eight LEDs forming 8, and the eight LEDs are divided into an upper LED group and a lower LED group; the PCB connecting line is connected between the display driving chip and the display group and is used for realizing data transmission between the display driving chip and the display group; any two PCB connecting lines have no intersection point; wherein the display driving chip comprises four segment driving output ports and a plurality of bit driving output ports, and the two LED groups of the same display group are connected with the same bit driving output port; the upper LED group is connected with two of the four segment driving output ports, and the lower LED group of the same display group is connected with the other two of the four segment driving output ports.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic scales, in particular to an LED red-letter display board applied to electronic scales. Background Art

[0002] As a widely used measuring device in modern commercial and industrial fields, the accuracy and usability of electronic scales are of great significance to improving work efficiency and user experience. Electronic scales mainly include pricing scales and platform scales, and the display panel, as an important component of electronic scales, directly affects the user's intuitive perception of the weight of items.

[0003] Traditional electronic scale display panels are mainly divided into red-letter display and black-letter display. Red-letter display usually uses digital tubes, which have the characteristics of clear display and easy reading. However, the cost of digital tube display panels is relatively high, which limits their application in low-cost electronic scale products. In order to reduce costs, manufacturers began to explore new display technologies, among which LED display panels have become an important solution to replace digital tubes. The specific implementation is to arrange LEDs into the shape of "8.", then put on a plastic shell, and stick a fluorescent film to achieve the effect of a digital tube.

[0004] LED display boards have the advantages of low power consumption, long life, high brightness, and relatively low cost, so they are widely used in electronic scales. At present, LED red-letter display boards have become the mainstream choice for electronic scale display boards. However, the existing LED red-letter display board solutions still have certain shortcomings.

[0005] Specifically, there are two main solutions for existing LED red-letter display boards, namely the solution based on the CS2540 driver chip and the solution based on the SDI1608 driver chip. The CS2540 solution uses ordinary 2-pin packaged LEDs, but in order to achieve the driving and control functions, an additional 18 jumper resistors are required, which increases the complexity and cost of the production process. Although the SDI1608 solution optimizes the jumper resistor problem by using a special 3-pin packaged LED, the device cost of the 3-pin packaged LED is higher than that of the 2-pin packaged LED. At the same time, one more point needs to be soldered during SMD patch processing and production, which also increases the production cost and process complexity. Utility Model Content

[0006] In order to solve the above problems, the utility model proposes a new type of LED red-letter display board. The display board adopts ordinary 2-pin packaged LED, and through the optimized circuit design, no jumper resistor is required, thereby simplifying the production process and reducing the cost. At the same time, the display board maintains the advantages of the LED display board, has the characteristics of high clarity, moderate brightness, low power consumption, etc., and is suitable for various electronic scale products.

[0007] The utility model is realized by the following technical solutions:

[0008] An LED red-letter display board applied to an electronic scale, comprising:

[0009] Printed circuit boards;

[0010] A display driver chip is arranged on the printed circuit board;

[0011] Display groups, a plurality of the display groups are arranged on the printed circuit board, each of the display groups includes eight LEDs forming an "8.", the eight LEDs are divided into an upper LED group and a lower LED group, and the LEDs are two-pin packaged;

[0012] PCB connecting wires, the PCB connecting wires are connected between the display driver chip and the display group, and are used to realize data transmission between the display driver chip and the display group; there is no intersection between any two PCB connecting wires;

[0013] The display driver chip includes four segment driver output ports and a plurality of bit driver output ports, two LED groups of the same display group are connected to the same bit driver output port, the upper LED group is connected to two of the four segment driver output ports, and the lower LED group of the same display group is connected to the other two of the four segment driver output ports;

[0014] The segment drive output port is located at a side of the display driver chip close to the display group; the segment drive output port is connected to the display group via a segment PCB connection line, and the segment PCB connection line is routed along the middle of each display group.

[0015] Furthermore, the display driver chip includes a first side and a second side relative to each other and a third side and a fourth side relative to each other; the segment driver output port is located on the first side, and the bit driver output port is located on the first side or the second side; the same bit driver output port is connected to the two LED groups from the upper and lower ends of the display group through two PCB connecting wires.

[0016] Furthermore, the segment drive output port located on the first side is connected to a first PCB connection line and a second PCB connection line, the first PCB connection line is led out in a direction away from the segment PCB connection line, and the second PCB connection line is arranged below the display driver chip on the printed circuit board and is led out from the third side or the fourth side of the display driver chip; the first PCB connection line and the second PCB connection line are respectively bent to connect to the two groups of LEDs from the upper and lower ends of the display group.

[0017] Furthermore, the closer the segment driver output port located on the first side is to the segment driver output port, the smaller the connection sequence number between the display group connected thereto and the display driver chip is; the distance from the first PCB connection line and the second PCB connection line to the segment PCB connection line is positively correlated with the distance from the bit driver output port connected thereto to the segment driver output port; wherein the sequence number refers to the arrangement of the display groups along the segment PCB connection line from small to large according to the distance from the display driver chip.

[0018] Further, the bit drive output port located on the second side includes two parts close to the third side and the fourth side respectively, the bit drive output port close to the third side is connected to a group of LEDs of the display group through a third PCB connection line; the bit drive output port close to the fourth side is connected to another group of LEDs of the display group through a fourth PCB connection line; the third PCB connection line and the fourth PCB connection line are respectively bent to connect to the two groups of LEDs from the upper and lower ends of the display group;

[0019] The serial number of the display group connected to the bit driver output port on the second side is greater than the serial number of the display group connected to the bit driver output port on the first side; wherein the serial number refers to the order of the display groups along the segment PCB connection line, according to the distance from the display driver chip from small to large.

[0020] Furthermore, the greater the distance between the bit driving output port located on the second side and the symmetry axis of the second side, the smaller the serial number of the display group connected thereto.

[0021] Furthermore, the bit driving output ports symmetrically arranged along the symmetry axis of the second side of the display driving chip are turned on in a one-to-one correspondence.

[0022] Furthermore, the bit driver output port on the second side also includes two independent bit driver output ports, wherein the independent bit driver output port close to the third side is bent upward and connected to the upper group of LEDs of the display group with the second largest serial number, and is routed to be connected to the lower group of LEDs; the independent bit driver output port close to the fourth side is bent downward and connected to the lower group of LEDs of the display group with the largest serial number, and is connected to the upper group of LEDs through a side PCB connecting line from a side away from the display driver chip.

[0023] Furthermore, the chip pins of the bit drive output ports that are turned on in one-to-one correspondence are turned on through package leads or PDA inside the chip.

[0024] Furthermore, a plurality of the display groups are arranged to form one row, two rows or three rows.

[0025] Compared with the prior art, the technical solution of the utility model and its beneficial effects are as follows:

[0026] The utility model is applied to the LED red-letter display board of the electronic scale, and no jumper resistor is required between the PCB connection wires, thereby reducing the device cost of the resistor and the SMD patch processing cost. In addition, only the common 2-pin packaged LED is required, thereby reducing the device cost of the special 3-pin packaged LED and the SMD patch processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a circuit diagram of an LED red-letter display board applied to an electronic scale provided by an embodiment of the utility model (the display groups are arranged in a row);

[0028] Figure 2 This is a principle block diagram of a display driver chip provided by an embodiment of the utility model;

[0029] Figure 3 This is a pin diagram of a display driver chip provided by an embodiment of the utility model;

[0030] Figure 4 It is a schematic diagram of the circuit structure of the display group provided by the embodiment of the utility model;

[0031] Figure 5 It is a partial circuit diagram of a red-letter display board provided by an embodiment of the utility model;

[0032] Figure 6 This is a circuit diagram of another LED red-letter display board provided by an embodiment of the utility model (the display groups are arranged in two rows);

[0033] Figure 7 This is a circuit diagram of another LED red-letter display board provided by an embodiment of the utility model (the display groups are arranged in three rows).

[0034] Illustration Description:

[0035] Display driver chip-1; first side-11; second side-12; third side-13; fourth side-14;

[0036] Display group-2; upper LED group-21; lower LED group-22;

[0037] PCB connecting line-3; first PCB connecting line-31; second PCB connecting line-32; third PCB connecting line-33; fourth PCB connecting line-34; segment PCB connecting line-35. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0039] See also Figure 1 , an LED red-letter display board used for an electronic scale, comprising a printed circuit board, a display driving chip arranged on the printed circuit board, a plurality of display groups and a plurality of PCB connecting wires.

[0040] See also Figure 2 and Figure 3 Display driver chip 1 adopts HX240, which is a 4*32+16 LED display driver control chip with SOP28 package, including four segment driver output ports SEG0-SEG3, two serial ports SDA and SCK, two power supply interfaces VDD and GND, and twenty bit driver output ports GRID0-GRID15. The display driver chip 1 includes a first side 11 and a second side 12, a third side 13 and a fourth side 14 that are arranged oppositely. Four segment drive output ports SEG0-SEG3 are located on the first side 11. There are also ten bit drive output ports GRID0-GRID9 located on the first side 11. Six bit drive output ports located on the second side 12 and close to the third side 13 are GRID10-GRID15 in sequence. Four bit drive output ports located on the second side 12 and close to the fourth side 14 are GRID10-GRID13 in sequence. GRID10, GRID11, GRID12, GRID13 close to the third side are connected to GRID10, GRID11, GRID12, GRID13 close to the fourth side in a one-to-one correspondence. In this embodiment, the chip pins of the one-to-one correspondingly connected drive output ports are connected through package leads.

[0041] See also Figure 4 and Figure 5 Each display group 2 includes eight LEDs forming an "8." The eight LEDs are divided into an upper LED group 21 and a lower LED group 22. The LEDs in this embodiment are ordinary 2-pin packaged LEDs. The PCB connection line 3 is connected between the display driver chip 1 and the display group 2 to realize data transmission between the display driver chip 1 and the display group 2; there is no intersection between any two PCB connection lines, thereby avoiding the use of jumper resistors.

[0042] The two LED groups of the same display group 2 are connected to the same bit drive output port, the upper LED group of the same display group is connected to two of the four segment drive output ports, and the lower LED group is connected to the other two of the four segment drive output ports. In this embodiment, the upper LED group is driven by a combination of SEG2, SEG3 and GRID0 to GRID15, and the lower LED group is driven by a combination of SEG0, SEG1 and GRID0 to GRID15.

[0043] The segment driver output port is located at the first side 11, that is, the side of the display driver chip 1 close to the display group 2; the segment driver output ports SEG0-SEG3 are connected to the display group 2 through segment PCB connecting lines 35, and the segment PCB connecting lines 35 are routed along the middle of each display group.

[0044] The segment drive output ports GRID0 to GRID15 are each connected to the two LED groups from the upper and lower ends of the display group through two PCB connection lines. Specifically, the segment drive output ports GRID0 to GRID19 located on the first side 11 are connected to the first PCB connection line 31 and the second PCB connection line 32. The first PCB connection line 31 is led out in a direction away from the segment PCB connection line 35. The second PCB connection line 32 is arranged on the printed circuit board, below the display driver chip 1, and is led out from the third side 33 or the fourth side 34 of the display driver chip. The first PCB connection line and the second PCB connection line are respectively bent to connect to the two LED groups from the upper and lower ends of the display group. In this embodiment, the first PCB connection line is arranged above the upper LED group 21, and the second PCB connection line is bent after being led out from the fourth side 34 and arranged below the lower LED group 22.

[0045] In order to avoid the crossing of the PCB connection lines, the closer the segment drive output port on the first side is to the segment drive output port, the smaller the connection number of the display group and the display driver chip connected to it, where the serial number refers to the display group along the segment PCB connection line, according to the distance from the display driver chip from small to large. The distance from the first PCB connection line and the second PCB connection line to the segment PCB connection line is positively correlated with the distance from the bit drive output port connected to it to the segment drive output port. For example, the bit drive output port GRID0 is closest to the segment drive output port, and the bit drive output port GRID0 is connected to the first display group. At the same time, the first PCB connection line and the second PCB connection line connected to the bit drive output port GRID0 are closest to the segment PCB connection line 35, that is, the closest to the display group routing. For another example, the bit driver output port GRID1 is second closest to the segment driver output port, and the bit driver output port GRID1 is connected to the second display group. At the same time, the first PCB connection line and the second PCB connection line connected to the bit driver output port GRID1 are second closest to the segment PCB connection line 35, that is, close to the PCB connection line connected to GRID0, and so on. This ensures that the first PCB connection lines connected to the bit driver output ports GRID0-GRID9 are routed in parallel to the top of the corresponding display group and then bent in sequence to connect to the display group. The second PCB connection lines are the same, thereby avoiding the first PCB connection lines and the second PCB connection lines from crossing each other, that is, there is no need to use jumper resistors.

[0046] The bit drive output port located on the second side 12 includes two parts respectively close to the third side 13 and the fourth side 14. The bit drive output port GRID10-GRID13 close to the third side 13 is connected to the upper LED group 21 of the display group through the third PCB connection line 33; the bit drive output port GRID10-GRID13 close to the fourth side 14 is connected to the lower LED group 22 of the display group through the fourth PCB connection line 34. The third PCB connection line and the fourth PCB connection line are respectively bent to connect to the two groups of LEDs from the upper and lower ends of the display group. It can be understood that in order to avoid the third PCB connection line crossing the first PCB connection line and the fourth PCB connection line crossing the second PCB connection line, the third PCB connection line 33 is located on the side of the first PCB connection line 31 away from the segment PCB connection line 35, and the fourth PCB connection line 34 is located on the side of the second PCB connection line 32 away from the segment PCB connection line 35.

[0047] It can be understood that the serial number of the display group connected to the bit driver output port located on the second side 12 is greater than the serial number of the display group connected to the bit driver output port located on the first side. The greater the distance between the bit driver output port located on the second side and the axis of symmetry of the second side, the smaller the serial number of the display group connected to it. For example, the bit driver output port GRID10 is connected to the display group ranked eleven, and the bit driver output port GRID10 is farthest from the axis of symmetry of the second side. The serial number of the display group connected to it is eleven, which is smaller than the serial number of the display group ranked twelve connected to the bit driver output port GRID11 which is closer to the axis of symmetry of the second side.

[0048] The bit drive output ports symmetrically arranged along the axis of symmetry on the second side of the display driver chip are connected in pairs, that is, GRID10, GRID11, GRID12, GRID13 near the third side are connected in one-to-one correspondence with GRID10, GRID11, GRID12, GRID13 near the fourth side, so that the upper and lower LED groups of the same display group can be driven in the same way at the same time. The bit drive output ports on the second side also include two independent bit drive output ports GRID14 and GRID15, wherein the independent bit drive output port GRID14 near the third side is bent upward and connected to the upper group of LEDs of the display group with the second largest serial number, and is routed to be connected to the lower group of LEDs, without the need for jumper resistors. The independent bit drive output port GRID15 near the fourth side is bent downward and connected to the lower group of LEDs of the display group with the largest serial number, and is connected to the upper group of LEDs through the side PCB connection line from the side away from the display driver chip, without the need for jumper resistors. In the present embodiment, only 10 second PCB connection wires and 4 fourth PCB connection wires are added, so that a conventional 2-pin packaged LED can be used. This avoids the jumper resistor that must be used when using a conventional 2-pin packaged LED in the past, reduces the device cost of the resistor and the SMD patch processing cost, and avoids the use of a 3-pin packaged LED with a more complicated patch process and higher cost, thereby reducing the device cost and the SMD patch processing cost.

[0049] In this embodiment, the display groups are arranged to form a row. In other embodiments, the display groups may also be arranged to form two or three rows, such as Figure 6 and Figure 7 According to the different numbers of rows of display groups, the bending and arrangement of the PCB connection lines are adjusted accordingly, but the fundamental setting principle is the same as that of the present embodiment and will not be repeated here.

[0050] The above description shows and describes the preferred embodiments of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept of this article through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. An LED red-letter display board used in electronic scales, characterized in that: include: Printed circuit boards; A display driver chip is arranged on the printed circuit board; Display groups, a plurality of the display groups are arranged on the printed circuit board, each of the display groups includes eight LEDs forming an "8.", the eight LEDs are divided into an upper LED group and a lower LED group, and the LEDs are two-pin packages; PCB connecting wires, the PCB connecting wires are connected between the display driver chip and the display group, and are used to realize data transmission between the display driver chip and the display group; there is no intersection between any two PCB connecting wires; The display driver chip includes four segment driver output ports and a plurality of bit driver output ports, two LED groups of the same display group are connected to the same bit driver output port, the upper LED group is connected to two of the four segment driver output ports, and the lower LED group of the same display group is connected to the other two of the four segment driver output ports; The segment drive output port is located at a side of the display driver chip close to the display group; the segment drive output port is connected to the display group via a segment PCB connection line, and the segment PCB connection line is routed along the middle of each display group.

2. The LED red-letter display board for electronic scales according to claim 1, characterized in that: The display driver chip includes a first side and a second side relative to each other and a third side and a fourth side relative to each other; the segment driver output port is located on the first side, and the bit driver output port is located on the first side or the second side; the same bit driver output port is connected to the two LED groups from the upper and lower ends of the display group through two PCB connecting wires.

3. The LED red-letter display board for electronic scales according to claim 2, characterized in that: The segment drive output port located on the first side is connected to a first PCB connection line and a second PCB connection line, the first PCB connection line is led out in a direction away from the segment PCB connection line, and the second PCB connection line is arranged below the display driver chip on the printed circuit board and is led out from the third side or the fourth side of the display driver chip; the first PCB connection line and the second PCB connection line are respectively bent to connect to the two groups of LEDs from the upper and lower ends of the display group.

4. The LED red-letter display board for electronic scales according to claim 3, characterized in that: The closer the segment drive output port located on the first side is to the segment drive output port, the smaller the connection sequence number between the display group connected thereto and the display driver chip is; the distance from the first PCB connection line and the second PCB connection line to the segment PCB connection line is positively correlated with the distance from the bit drive output port connected thereto to the segment drive output port; wherein the sequence number refers to the arrangement of the display groups along the segment PCB connection line from small to large according to the distance from the display driver chip.

5. The LED red-letter display board for electronic scales according to claim 2, characterized in that: The bit drive output port located on the second side includes two parts close to the third side and the fourth side respectively, the bit drive output port close to the third side is connected to a group of LEDs of the display group through a third PCB connection line; the bit drive output port close to the fourth side is connected to another group of LEDs of the display group through a fourth PCB connection line; the third PCB connection line and the fourth PCB connection line are respectively bent to connect to the two groups of LEDs from the upper and lower ends of the display group; The serial number of the display group connected to the bit driver output port on the second side is greater than the serial number of the display group connected to the bit driver output port on the first side; wherein the serial number refers to the order of the display groups along the segment PCB connection line, according to the distance from the display driver chip from small to large.

6. The LED red-letter display board for electronic scales according to claim 5, characterized in that: The greater the distance between the bit driving output port located on the second side and the symmetry axis of the second side, the smaller the serial number of the display group connected to it.

7. The LED red-letter display board for electronic scales according to claim 5, characterized in that: The bit drive output ports symmetrically arranged along the symmetry axis of the second side of the display driver chip are turned on in a one-to-one correspondence.

8. The LED red-letter display board for electronic scales according to claim 7, characterized in that: The bit driver output port on the second side also includes two independent bit driver output ports, wherein the independent bit driver output port close to the third side is bent upward and connected to the upper group of LEDs of the display group with the second largest serial number, and is routed to be connected to the lower group of LEDs; the independent bit driver output port close to the fourth side is bent downward and connected to the lower group of LEDs of the display group with the largest serial number, and is connected to the upper group of LEDs through a side PCB connecting line from a side away from the display driver chip.

9. The LED red-letter display board for electronic scales according to claim 1, characterized in that: The chip pins of the bit drive output ports that are turned on one by one are turned on through package leads or PDAs in the chip.

10. The LED red-letter display board for electronic scales according to claim 1, characterized in that: A plurality of the display groups are arranged to form one row, two rows or three rows.

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