COB display screen common-cathode common-anode compatible circuit and pixel display module
By designing a COB display circuit compatible with both common cathode and common anode, the switching or simultaneous operation of common anode and common cathode modes was realized, solving the problem of blurry display modules in existing technologies, improving display clarity and reducing energy consumption.
Patent Information
- Application Number
- CN202422603748.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-10-28
AI Technical Summary
Most existing COB display modules use 3 or 4 LED display units arranged vertically, resulting in blurry images that cannot meet the requirements for high image quality. Furthermore, traditional circuit solutions are not compatible with common cathode and common anode designs.
Design a common anode and common cathode compatible circuit for COB display screen, including a main control module, a common anode circuit and a common cathode circuit. The main control module controls the switching of the common anode and common cathode switching modules to realize the switching or simultaneous operation of common anode and common cathode. The common anode LED group and the common cathode LED group are arranged in an equilateral triangle on the surface of the COB display screen.
The display module's display effect has been improved, display clarity has been enhanced, and power consumption has been reduced.
Smart Images
Figure CN223598383U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of display screens, and more specifically, to a common cathode and common anode compatible circuit and pixel display module for COB display screens. Background Technology
[0002] Currently, COB displays are divided into two categories: those using a traditional common anode circuit scheme and those using a common cathode circuit scheme. Common cathode technology uses a single common negative terminal for all LED pixel display modules, while the positive terminals are powered separately. Conversely, common anode technology connects the anodes of all LED pixel display modules together, sharing a single positive terminal. The two technologies differ in terms of power supply convenience, energy consumption, and light emission control, and are suited to different usage environments. Furthermore, most existing pixel display modules use a vertical arrangement of 3 or 4 LED display units. This arrangement results in blurry and unclear pixel display, and traditional circuit schemes and LED layouts cannot meet the current demand for high-definition images. Utility Model Content
[0003] The problem solved by this invention is how to provide a circuit that meets the configuration requirements of common cathode and common anode compatible designs for COB displays and to improve the pixel display module.
[0004] To address the aforementioned problems, this utility model provides a common cathode / common anode compatible circuit and a pixel display module for a COB display screen. The circuit comprises a common cathode / common anode compatible circuit and a pixel display module. The common cathode / common anode compatible circuit includes a main control module, a common anode circuit, and a common cathode circuit. The common anode circuit includes a common anode control module, a common anode switch module, and a common anode display module. The common anode display module includes multiple common anode LED groups, each composed of red, blue, and green common anode display chips. The anode of each common anode display chip is connected to a common positive power supply via a common anode switch module. The switch module is controlled by the main control module. The cathodes are each output voltage separately by the common anode control module. The communication terminal of the common anode control module is connected to the main control module. The common cathode circuit includes a common cathode control module, a common cathode switch module, and a common cathode display module. The common cathode display module includes multiple common cathode light-emitting diode groups. The common cathode light-emitting diode groups are composed of red, green, and blue common cathode display chips. The cathodes of the common cathode display chips are grounded through the common cathode switch module. The common cathode switch module is controlled by the main control module. The anodes are each output voltage separately by the common cathode control module. The communication terminal of the common cathode control module is connected to the main control module.
[0005] Specifically, the common anode control module includes multiple common anode driver chips, which are connected in series, and each common anode driver chip is communicatively connected to the main control module.
[0006] Specifically, the common anode driver chip is model FM6565.
[0007] Specifically, the common anode switch module includes multiple common anode switches, each of which is controlled by the main control module. The multiple common anode LED groups of the common anode display module are connected in parallel, and the three-color common anode display chips of the common anode LED groups are connected in series. The anode of the common anode LED group is connected to a common positive power supply via a corresponding common anode switch, and the cathode of the common anode LED group is connected to a drive output terminal of the common anode driver chip.
[0008] Specifically, the common anode LED assembly is installed on the COB display screen. The common anode LED assembly is a display unit composed of red, green, and blue common anode chips. The red common anode chip is located in the upper left, the blue common anode chip is located in the lower left, and the green common anode chip is located in the middle right. The red and blue common anode chips are located on the same vertical line, and the red, green, and blue common anode chips form an equilateral triangle from the center point.
[0009] Specifically, the common cathode control module includes multiple common cathode driver chips, which are connected in series, and each common cathode driver chip is communicatively connected to the main control module.
[0010] Specifically, the common cathode driver chip is model FM6569.
[0011] Specifically, the common cathode switch module includes multiple common cathode switches, each of which is controlled by the main control module. The multiple common cathode LED groups of the common cathode display module are connected in parallel, the three-color common cathode display chips of the common anode LED group are connected in series, the cathode of the common cathode LED group is grounded through a corresponding common cathode switch, and the anode of the common cathode LED group is connected to a drive output terminal of the common anode driver chip.
[0012] Specifically, the common cathode LED assembly is installed on the COB display screen. The common cathode LED assembly is a display unit composed of red, green and blue common cathode chips. The red common cathode chip is located in the upper right part, the blue common cathode chip is located in the lower right part, and the green common cathode chip is located in the middle right part. The red common cathode chip and the blue common cathode chip are located on the same vertical straight line. The red, green and blue common cathode chips form an equilateral triangle from the center point.
[0013] Specifically, the COB display pixel display module includes a common anode display module and a common cathode display module. The common anode display modules are arranged in the 0-number horizontal row, and the common cathode display modules are arranged in the even-number horizontal row. The two vertically adjacent common anode LED groups and common cathode LED groups form a parallelogram. The distance between two adjacent display chips is X. The distance from the red common anode chip to the green common cathode chip is 2X. The distance from the green common anode chip to the blue common cathode chip is 2X.
[0014] Specifically, within the common anode LED group, the red common anode chip is located on the upper left, the blue common anode chip is located on the upper right, and the green chip is located on the lower middle. Within the common cathode LED group, the red common cathode chip is located on the lower left, the blue common cathode chip is located on the lower right, and the green common cathode chip is located on the upper middle. The common anode LED groups are arranged in odd-numbered columns, and the common cathode LED groups are arranged in even-numbered columns. The two horizontally adjacent common anode LED groups and common cathode LED groups form a parallelogram. The distance between two adjacent display chips is X. The distance from the red common anode chip to the green common cathode chip is 2X, and the distance from the green common anode chip to the blue common cathode chip is 2X.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] This invention's COB display board simultaneously incorporates a common anode module and a common cathode module. A main control module controls the switching between the COB display module and the COB common cathode chip. When common anode is needed, the main control module controls the switch in the common anode switch module to open, connecting the anode of the common anode display chip in the common anode LED group to a common positive power supply. Simultaneously, the main control module sends a signal to the common anode control module, where each drive pin of the chip controls the cathode of the corresponding common anode LED group, thus achieving common anode operation. When common cathode is needed, the signal to the common anode circuit is stopped, the switch in the common anode switch module is turned off, and the main control module controls the switch in the common cathode switch module to open, connecting the cathode of the common anode display chip in the common cathode LED group to a common ground. Simultaneously, the main control module sends a signal to the common cathode control module, where each drive pin of the chip controls the cathode of the corresponding common anode LED group, thus achieving common anode operation. The anode of the common-cathode LED group emits a corresponding driving voltage, realizing common-cathode operation. Common-cathode and common-cathode operation can be switched back and forth or simultaneously. The COB display module includes a common-cathode LED group and a common-cathode LED group. The common-cathode LED group includes red, green, and blue common-cathode LED chips, and the common-cathode LED group includes red, green, and blue common-cathode LED chips. The common-cathode LED group and the common-cathode LED group are arranged in an equilateral triangle on the surface of the COB display screen. The common-cathode LED chips are arranged in odd-numbered rows and the common-cathode LED chips are arranged in even-numbered rows to form a display module. When displaying, the three-color LED chips in the display module form physical pixels, and any three adjacent LED chips form a display unit, forming a virtual pixel. This significantly enhances the actual display effect, and the switching between common-cathode and common-cathode operation reduces power consumption. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall principle structure of an embodiment of the present utility model;
[0018] Figure 2 This is a schematic diagram of the common anode circuit structure according to an embodiment of the present invention;
[0019] Figure 3 This is a schematic diagram of the three-color common-anode wafer structure according to an embodiment of the present invention;
[0020] Figure 4 This is a schematic diagram of the common cathode circuit structure of an embodiment of the present invention;
[0021] Figure 5 This is a schematic diagram of the three-color common cathode wafer structure according to an embodiment of the present invention;
[0022] Figure 6 This is a schematic diagram of the display module structure according to an embodiment of the present utility model;
[0023] Figure 7 This is a schematic diagram of the virtual circuit structure of the display module in an embodiment of this utility model;
[0024] Figure 8 This is a schematic diagram of the three-color common-anode wafer structure according to the second embodiment of this utility model;
[0025] Figure 9 This is a schematic diagram of the three-color common cathode wafer structure according to the second embodiment of this utility model;
[0026] Figure 10 This is a schematic diagram of the display module structure according to the second embodiment of the present invention;
[0027] Figure 11 This is a schematic diagram of the virtual circuit structure of the display module in the second embodiment of the present invention; Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0030] like Figure 1 As shown, the display includes a COB display screen common cathode / common anode compatible circuit and a pixel display module. The COB display screen common cathode / common anode compatible circuit includes a main control module, a common anode circuit, and a common cathode circuit. The common anode circuit includes a common anode control module, a common anode switch module, and a common anode display module. The common anode display module includes multiple common anode LED groups, each composed of red, blue, and green common anode display chips. The anode of each common anode display chip is connected to a common positive power supply through a common anode switch module. The common anode switch module is controlled by the main control module. The cathodes are respectively connected to common anode LEDs. The control module outputs voltage independently. The communication terminal of the common anode control module is connected to the main control module. The common cathode circuit includes a common cathode control module, a common cathode switch module, and a common cathode display module. The common cathode display module includes multiple common cathode LED groups, each composed of red, green, and blue common cathode display chips. The cathodes of the common cathode display chips are grounded through the common cathode switch module. The common cathode switch module is controlled by the main control module. The anodes are output voltage independently by the common cathode control module. The communication terminal of the common cathode control module is connected to the main control module.
[0031] This invention's COB display board simultaneously incorporates a common anode module and a common cathode module. A main control module controls the switching between the COB display module and the COB common cathode chip. When common anode is needed, the main control module opens the switch in the common anode switch module, connecting the anode of the common anode display chip in the common anode LED group to a common positive power supply. Simultaneously, the main control module sends a signal to the common anode control module, where each drive pin of the chip controls the cathode of the corresponding common anode LED group, achieving common anode operation. When common cathode is needed, the signal to the common anode circuit is stopped, the switch in the common anode switch module is turned off, and the main control module opens the switch in the common cathode switch module, connecting the cathode of the common cathode LED group to a common ground. Simultaneously, the main control module sends a signal to the common cathode control module, where each drive pin of the chip delivers a corresponding drive voltage to the anode of the corresponding common cathode LED group, achieving common cathode operation. Common anode and common cathode operation can be switched back and forth or performed simultaneously.
[0032] In one embodiment of this utility model, such as Figure 2 As shown, the common anode control module includes multiple common anode driver chips, which are connected in series. Each common anode driver chip is communicatively connected to the main control module. The common anode driver chip is model FM6565. The common anode switch module includes multiple common anode switches, each of which is controlled by the main control module. Multiple common anode LED groups of the common anode display module are connected in parallel. The three-color common anode display chips of the common anode LED groups are connected in series. The anode of the common anode LED group is connected to a common positive power supply through a corresponding common anode switch. The cathode of the common anode LED group is connected to a drive output terminal of the common anode driver chip.
[0033] It should be noted that, Figure 2 In this module, IC1 and IC2 are common anode driver chips, and their number can be set according to requirements. DCLK, LE, and SWTICH are communication signals between the common anode driver chips and the main control module. Each output drive signal of the common anode driver chip controls the cathode grounding of the common anode LED group. CH1-CH64 are common anode switches, and their specific number can be set according to the number of common anode LED groups. Each common anode switch controls the anode of one common anode LED group to connect to the common positive power supply. Through the control of the common anode switch module, the on / off control of each pixel display module is realized, achieving COB common anode control. The common anode switches in the common anode switch module can take various forms. For example, normally open switches of relays can be used. The main control module controls the on / off state of the relays through output drive signals, thereby enabling the normally open contacts to switch and realize the switching control of the corresponding row.
[0034] In one embodiment of this utility model, Figure 3In the above, the common anode display module includes multiple common anode light-emitting diode groups. Each common anode light-emitting diode group is composed of red, green and blue common anode chips. The red common anode chip is located on the upper left, the blue common anode chip is located on the lower left, and the green common anode chip is located on the middle right. The red and blue common anode chips are located on the same vertical straight line, and the red, green and blue common anode chips form an equilateral triangle from the center point.
[0035] In one embodiment of this utility model, such as Figure 4 As shown, the common cathode control module includes multiple common cathode driver chips, which are connected in series. Each common cathode driver chip is communicatively connected to the main control module. The common cathode driver chip is model FM6569. The common cathode switch module includes multiple common cathode switches, each of which is controlled by the main control module. The multiple common cathode LED groups of the common cathode display module are connected in parallel. The three-color common cathode display chips of the common anode LED group are connected in series. The cathode of the common cathode LED group is grounded through a corresponding common cathode switch. The anode of the common cathode LED group is connected to a drive output terminal of the common anode driver chip.
[0036] It should be noted that, Figure 4 In this chip, IC1N and IC2N are common cathode driver chips, and the number of chips can be set according to requirements. Each output drive signal of the common cathode driver chip sends a drive voltage to the cathode of the corresponding column of common cathode LED group. CF1-CFn are common cathode switches. Each common cathode switch controls the cathode grounding of the common cathode pixel display module in a row. Through row and column control, the on / off control of each LED is realized, thus achieving COB common cathode control.
[0037] In one embodiment of this utility model, Figure 5 In the above, the common cathode display module includes multiple common cathode light-emitting diode groups. The common cathode light-emitting diode groups are composed of red, green and blue common anode chips. The red common anode chip is located in the upper right part, the blue common anode chip is located in the lower right part, and the green common anode chip is located in the middle left part. The red common anode chip and the blue common anode chip are located on the same vertical straight line. The red, green and blue common cathode chips form an equilateral triangle from the center point.
[0038] like Figure 6As shown, the COB display pixel display module includes a common anode display module and a common cathode display module. The common anode display module includes multiple common anode LED groups arranged in odd-numbered rows. The red and blue common anode chips of the common anode LED groups are located on the same vertical line, and each green common cathode chip is located on the same vertical line as the red and blue common anode chips. The common cathode display module includes multiple common cathode LED groups arranged in even-numbered rows. The red and blue common cathode chips of the common cathode LED groups are arranged on the same vertical line, and each green common anode chip is located on the same vertical line as the red and blue common cathode chips. The structure is compact, and the display effect is clearer.
[0039] It should be noted that, as Figure 1 and Figure 7 As shown, P1 is a common anode LED group, and P2 is a common cathode LED group. The common anode display module includes multiple common anode LED groups, each LED group being a display unit. Each row of common anode LED groups is interconnected. Through the main control module signal received by the common anode control module, the common anode switch module controls the on / off state of the common anode display chip. The common cathode display module includes multiple common cathode LED groups, each LED group being a display unit. Each row of common cathode LED groups is interconnected. Through the main control module signal received by the common cathode control module, the common cathode switch module controls the on / off state of the common cathode display chip. In the COB display screen, the distance between any two adjacent display chips is X. The distance from the red common anode chip to the green common cathode chip is 2X, and the distance from the green common anode chip to the blue common cathode chip is 2X. For example, the two adjacent common anode LED groups and common cathode LED groups P1 and P2 form a virtual parallelogram, which makes the pixel display effect 4 times more efficient.
[0040] In the second embodiment of this example, as Figure 8 , 9 In the common anode LED group, the red common anode chip is located on the upper left, the blue chip is located on the upper right, and the green chip is located in the lower middle. In the common cathode LED group, the green common cathode chip is located on the lower left, the blue chip is located on the lower right, and the green chip is located in the upper middle. The common anode LED groups are arranged in odd-numbered columns, with the red and blue common anode chips on the same horizontal line, and each green common anode chip and the red and blue common cathode chip on the same horizontal line. The common cathode LED groups are arranged in even-numbered columns, with the red and blue common cathode chips on the same horizontal line, and each green common cathode chip and the red and blue common anode chips on the same vertical line.
[0041] It should be noted that, in the second embodiment, as Figure 1 and 11P3 is a common anode LED group, and P4 is a common cathode LED group. Each column of common anode LED groups is interconnected. Through the signal received from the main control module by the common anode control module, the common anode switch module controls the on / off state of the common anode display chip. Each column of common cathode LED groups is interconnected. Through the signal received from the main control module by the common cathode control module, the common cathode switch module controls the on / off state of the common cathode display chip. In the COB display screen, the distance between any two adjacent display chips is X. The distance from the red common anode chip to the green common cathode chip is 2X, and the distance from the green common anode chip to the blue common cathode chip is 2X. For example, the two adjacent common anode LED groups and common cathode LED groups P3 and P4 form a virtual parallelogram, which makes the pixel display effect 4 times more efficient.
[0042] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.
Claims
1. A common cathode and common anode compatible circuit for a COB display screen and a pixel display module, comprising a common cathode and common anode compatible circuit for a COB display screen and a pixel display module, characterized in that, The COB display screen's common-cathode / common-anode compatible circuit includes a main control module, a common-anode circuit, and a common-cathode circuit. The common-anode circuit includes a common-anode control module, a common-anode switch module, and a common-anode display module. The common-anode display module includes multiple common-anode LED groups, each composed of red, blue, and green common-anode display chips. The anode of each common-anode display chip is connected to a common positive power supply via a common-anode switch module, which is controlled by the main control module. The cathodes are individually output voltage by the common-anode control module, and the communication terminal of the common-anode control module is connected to the main control module. The common-cathode circuit includes a common-cathode control module, a common-cathode switch module, and a common-cathode display module. The common-cathode display module includes multiple common-cathode LED groups, each composed of red, green, and blue common-cathode display chips. The cathodes of each common-cathode display chip are grounded via a common-cathode switch module, which is controlled by the main control module. The anodes are individually output voltage by the common-cathode control module, and the communication terminal of the common-cathode control module is connected to the main control module.
2. The COB display screen common cathode and common anode compatible circuit and pixel display module according to claim 1, characterized in that, The common anode control module includes multiple common anode driver chips, which are connected in series, and each common anode driver chip is communicatively connected to the main control module.
3. The COB display screen common cathode and common anode compatible circuit and pixel display module according to claim 2, characterized in that, The common anode driver chip is model FM6565.
4. The COB display screen common cathode and common anode compatible circuit and pixel display module according to claim 3, characterized in that, The common anode switch module includes multiple common anode switches, each of which is controlled by the main control module. The multiple common anode LED groups of the common anode display module are connected in parallel, and the three-color common anode display chips of the common anode LED groups are connected in series. The anode of the common anode LED group is connected to a common positive power supply via a corresponding common anode switch, and the cathode of the common anode LED group is connected to a drive output terminal of the common anode driver chip.
5. The COB display screen common cathode and common anode compatible circuit and pixel display module according to claim 4, characterized in that, The common anode LED assembly is installed on the COB display screen. The common anode LED assembly is a display unit composed of red, green and blue common anode chips. The red common anode chip is located in the upper left, the blue common anode chip is located in the lower left, and the green common anode chip is located in the middle right. The red and blue common anode chips are located on the same vertical line, and the red, green and blue common anode chips form an equilateral triangle from the center point.
6. The COB display screen common cathode and common anode compatible circuit and pixel display module according to claim 1, characterized in that, The common cathode control module includes multiple common cathode driver chips, which are connected in series, and each common cathode driver chip is communicatively connected to the main control module.
7. The COB display screen common cathode and common anode compatible circuit and pixel display module according to claim 6, characterized in that, The common cathode driver chip is model FM6569.
8. The COB display screen common cathode and common anode compatible circuit and pixel display module according to claim 7, characterized in that, The common cathode switch module includes multiple common cathode switches, each of which is controlled by the main control module. The multiple common cathode LED groups of the common cathode display module are connected in parallel, and the three-color common cathode display chips of the common anode LED group are connected in series. The cathode of the common cathode LED group is grounded through a corresponding common cathode switch, and the anode of the common cathode LED group is connected to a drive output terminal of the common anode driver chip.
9. A COB display screen common cathode and common anode compatible circuit and pixel display module according to claim 8, characterized in that, The common cathode LED assembly is installed on the COB display screen. The common cathode LED assembly is a display unit composed of red, green and blue common cathode chips. The red common cathode chip is located in the upper right part, the blue common cathode chip is located in the lower right part, and the green common cathode chip is located in the middle right part. The red common cathode chip and the blue common cathode chip are located on the same vertical straight line. The red, green and blue common cathode chips form an equilateral triangle from the center point.
10. A COB display screen common cathode and common anode compatible circuit and pixel display module according to claim 5 or 9, characterized in that, The COB display pixel display module includes a common anode display module and a common cathode display module. The common anode display modules are arranged in odd-numbered rows, and the common cathode display modules are arranged in even-numbered rows. The two vertically adjacent common anode LED groups and common cathode LED groups form a parallelogram. The distance between two adjacent display chips is X. The distance from the red common anode chip to the green common cathode chip is 2X, and the distance from the green common anode chip to the blue common cathode chip is 2X.