An LCD driving system based on FZH1625

Abstract

This utility model discloses an LCD driving system based on FZH1625, relating to the field of display driving technology. It includes a main control module, a power supply module, a driving module, and a protection module. The driving module is electrically connected to the main control module via a three-wire serial interface. The protection module is wired to the driving module. The output of the power supply module is electrically connected to both the main control module and the driving module, providing power to them. This utility model connects the driving module and the main control module via a three-wire serial interface. Compared to traditional parallel interfaces, the three-wire serial interface reduces the number of pins, lowers circuit complexity and cost, and provides stronger anti-interference capabilities, ensuring the stability and reliability of circuit operation. The driving module reduces the driving cost of the LCD, improves adjustability, and makes the control method more flexible. The protection module ensures the stability and safety of the driving circuit.

Description

Technical Field

[0001] This utility model relates to the field of display driving technology, specifically to an LCD driving system based on FZH1625. Background Technology

[0002] LCD (Liquid Crystal Display) is a flat panel display technology based on the optical properties of liquid crystal materials. It is widely used in consumer electronics, industrial equipment, medical instruments, and other fields. LCDs achieve display by controlling light through liquid crystal molecules, and occupy the mainstream market due to their low cost, high reliability, and mature industrial chain.

[0003] Currently, there is still a static driving method for LCDs, which connects each display unit to a separate driving pin and applies voltage continuously. Although the circuit is simple, the display is stable and flicker-free, and the power consumption is extremely low, it occupies many pins and is only suitable for very low-complexity displays, such as single digital segment codes. It can only be used for electronic watches, calculators, and simple dashboards. Passive matrix (PM) drives form pixels through row and column intersections, scans line by line, and supplies power in a time-division manner. The circuit structure is simple and the cost is low, making it suitable for small and medium-sized dot matrices. However, it has problems such as obvious cross-effects, slow response, and low contrast. Utility Model Content

[0004] To address the aforementioned technical problems, an LCD driving system based on FZH1625 is provided. This technical solution solves the problem of static driving proposed in the background technology, which achieves static driving by independently connecting each display unit to a driving pin and continuously applying voltage. Although the circuit is simple, the display is stable and flicker-free, and the power consumption is extremely low, it occupies many pins and is only suitable for very low-complexity displays, such as single digital segment codes. It can only be applied to electronic watches, calculators, and simple dashboards. Passive matrix driving (PM) uses row and column intersections to form pixels, scans line by line, and supplies power in a time-division manner. The circuit structure is simple and the cost is low, making it suitable for small and medium-sized dot matrices. However, it suffers from obvious cross-effects, slow response, and low contrast.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An LCD driving system based on FZH1625 includes a main control module, a power supply module, a driving module, and a protection module. The driving module is electrically connected to the main control module through a three-wire serial interface.

[0007] The protection module is wired to the drive module;

[0008] The output terminal of the power module is electrically connected to the main control module and the drive module, and is used to supply power to the main control module and the drive module.

[0009] Preferably, the main control module integrates a U1 chip, and the 9th pin of the U1 chip is electrically connected to a capacitor C1 and electrically connected to a 5V voltage input, while the 7th pin of the U1 chip is grounded.

[0010] Preferably, the driving module integrates a U2 chip, pin 10 of the U2 chip is electrically connected to pin 14 of the U1 chip, pin 11 of the U2 chip is electrically connected to pin 13 of the U1 chip, pin 12 of the U2 chip is electrically connected to pin 12 of the U1 chip, pin 15 of the U2 chip is electrically connected to a capacitor C4 and is electrically connected to a 5V voltage input, and pin 13 of the U2 chip is grounded.

[0011] Preferably, the protection module integrates a resistor R3, which is electrically connected to pins 14 and 15 of the U2 chip and grounded.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention proposes an LCD driving system based on FZH1625. The driving module is connected to the main control module through a three-wire serial interface. Compared with the traditional parallel interface, the three-wire serial interface reduces the number of pins, lowers circuit complexity and cost, and has stronger anti-interference capability, ensuring the stability and reliability of circuit operation. The driving module reduces the driving cost of the LCD, improves adjustability, and makes the control method more flexible. The protection module ensures the stability and safety of the driving circuit. Attached Figure Description

[0014] Figure 1 This utility model presents a block diagram of an LCD driving system based on FZH1625.

[0015] Figure 2 This is the circuit diagram of the main control module in this utility model;

[0016] Figure 3 This is the circuit diagram of the drive module in this utility model;

[0017] Figure 4 This is the pin distribution of the LCD screen in the embodiment of the utility model. Detailed Implementation

[0018] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0019] Reference Figure 1-3As shown in the figure, an LCD driving system based on FZH1625 in this embodiment of the present invention includes a main control module, a power supply module, a driving module and a protection module. The driving module is electrically connected to the main control module through a three-wire serial interface.

[0020] The protection module is wired to the drive module;

[0021] The output terminal of the power module is electrically connected to the main control module and the drive module, and is used to supply power to the main control module and the drive module;

[0022] The main control module integrates a U1 chip. The 9th pin of the U1 chip is electrically connected to a capacitor C1 and is electrically connected to a 5V voltage input. The 7th pin of the U1 chip is grounded.

[0023] The drive module integrates a U2 chip. Pin 10 of the U2 chip is electrically connected to pin 14 of the U1 chip. Pin 11 of the U2 chip is electrically connected to pin 13 of the U1 chip. Pin 12 of the U2 chip is electrically connected to pin 12 of the U1 chip. A capacitor C4 is electrically connected to pin 15 of the U2 chip and is electrically connected to a 5V voltage input. Pin 13 of the U2 chip is grounded.

[0024] The protection module integrates a resistor R3, which is electrically connected to pins 14 and 15 of the U2 chip and grounded.

[0025] It should be noted that the main control module in this embodiment integrates a microcontroller. The U2 chip is specifically an FZH1625 chip. The microcontroller is not limited by model or pin. Only ordinary I / O ports are needed to control the FZH1625 to achieve the required display effect. When driving the LCD to display, the LCD screen needs to have the pattern segment code designed in advance.

[0026] Furthermore, the FZH1625 is a 56-dot, memory-imaged, and multi-functional LCD driver. Its software configuration features make it suitable for a variety of LCD applications, including LCD modules and display subsystems. The communication timing between the main controller and the FZH1625 is simple.

[0027] The main microcontroller is connected to the FZH1625 via a three-wire serial connection. Data and commands are written to the FZH1625 through the serial interface, and the FZH1625 displays the corresponding information under specific timing conditions. When / CS is high, writing data and commands to the FZH1625 is invalid, and the serial interface circuit is reset. When / CS is low and used as an input, writing data and commands to the FZH1625 is valid. On the rising edge of the / WR signal, data on the DATA line is written to the FZH1625.

[0028] The FZH1625 performs corresponding segment code driving based on the received data. Figure 2 and Figure 3 The pin distribution enables the corresponding pattern to be turned on and off.

[0029] It is worth noting that the microcontroller model mentioned in this embodiment is only for implementing this embodiment and is not intended to limit this utility model. The LCD driving circuit design based on FZH1625 proposed in this utility model can be implemented by connecting any microcontroller's ordinary I / O port to FZH1625 via a three-wire serial connection.

[0030] Reference Figure 4 As shown, in this embodiment of the present invention, for the LCD screen, pin 3 of the LCD screen is electrically connected to pin 16 of the U2 chip, and pin 4 of the LCD screen is electrically connected to pin 17 of the U2 chip.

[0031] Understandably, static driving achieves this by independently connecting each display unit (such as a segment code) to a driving pin and continuously applying voltage. Although the circuit is simple, the display is stable and flicker-free, and the power consumption is extremely low, it occupies many pins and is only suitable for displays with very low complexity (such as a single digital segment code). It is only applicable to electronic watches, calculators, and simple dashboards.

[0032] As for dynamic driving, passive matrix driving (PM) uses row and column intersections to form pixels, scanning row by row and powering in a time-division manner. Although it has a simple structure and low cost, it is suitable for small and medium-sized dot matrices, with obvious cross-linking effects, slow response (>100ms), and low contrast. It is only suitable for early monochrome mobile phone screens and low-resolution character screens (such as 1602 LCD). Active matrix driving integrates thin film transistors (TFTs) and storage capacitors in each pixel, independently controlling the voltage. It has no cross-linking effects, high contrast, fast response (<10ms), and supports high resolution. However, it has a complex process, high cost, and slightly higher power consumption. It is only suitable for smartphones, tablets, and high-definition displays (TFT-LCD).

[0033] Segment code driving directly drives predefined patterns (such as numbers and symbols), with electrodes corresponding one-to-one with display segments. It features ultra-low power consumption, simple circuitry, and stable display, but it cannot display dynamic graphics and has poor scalability. It is only suitable for electronic scales, temperature controllers, and fixed symbol display devices.

[0034] Dot matrix drive, which dynamically scans and controls the brightness of each dot by arranging pixels in a matrix, supports graphics and complex characters and is highly flexible, but requires complex control logic and is prone to flickering when the refresh rate is insufficient. It is suitable for early game console screens and industrial control terminals.

[0035] In summary, the advantages of this utility model are as follows: the filtering circuit of the servo power module reduces power ripple, enhances protection against power switching noise and electromagnetic interference, optimizes power output performance quality, prevents current backflow when power is off by using series diodes, and utilizes the reverse cutoff characteristic of diodes to provide reverse connection protection, protects the load equipment, and ensures the stability of the power supply box. Through circuit redundancy design, it ensures that when one power supply fails, the other power supply can continue to provide stable power output without interrupting the normal operation of the load equipment, thus improving the reliability of the power supply box.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An LCD driving system based on FZH1625, characterized in that, It includes a main control module, a power supply module, a drive module, and a protection module. The drive module is electrically connected to the main control module via a three-wire serial interface. The protection module is wired to the drive module; The output terminal of the power module is electrically connected to the main control module and the drive module, and is used to supply power to the main control module and the drive module.

2. The LCD driving system based on FZH1625 according to claim 1, characterized in that, The main control module integrates a U1 chip. The 9th pin of the U1 chip is electrically connected to a capacitor C1 and is electrically connected to a 5V voltage input. The 7th pin of the U1 chip is grounded.

3. The LCD driving system based on FZH1625 according to claim 1, characterized in that, The drive module integrates a U2 chip. Pin 10 of the U2 chip is electrically connected to pin 14 of the U1 chip. Pin 11 of the U2 chip is electrically connected to pin 13 of the U1 chip. Pin 12 of the U2 chip is electrically connected to pin 12 of the U1 chip. A capacitor C4 is electrically connected to pin 15 of the U2 chip and is electrically connected to a 5V voltage input. Pin 13 of the U2 chip is grounded.

4. The LCD driving system based on FZH1625 according to claim 1, characterized in that, The protection module integrates a resistor R3, which is electrically connected to pins 14 and 15 of the U2 chip and grounded.

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