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lcd 单片机驱动电路
LCD单片机驱动电路是指用于驱动液晶显示屏（LCD）的电路。
LCD是一种常用的显示设备，广泛应用于数码产品、电子设备等领域。
LCD的驱动电路主要由以下几部分组成：
1. 控制器：控制器是核心部件，负责接收来自单片机的信号，并控制液晶显示屏的显示内容。
2. 驱动器：驱动器负责将控制器发送的信号转化为液晶显示屏可以理解的电信号，以实现显示功能。
3. 电源管理：电源管理模块负责为液晶显示屏提供所需的电源，包括正负电源以及背光灯等。
4. 通信接口：通信接口用于将单片机与LCD驱动电路连接起来，实现数据传输和控制信号的交互。
5. 储存器：在一些应用中，LCD驱动电路可能需要储存一些显示数据或者程序代码，以实现更复杂的显示效果。
总的来说，LCD单片机驱动电路是一个复杂的系统，根据不同的应用需求，其具体的设计和实现方式会有所差异。
一般来说，需要根据液晶显示屏的规格和单片机的输出能力，选用合适的控制器和驱动器，并合理设计电源管理和通信接口，以实现稳定、可靠的液晶显示功能。
LCD屏电路原理浅析以及RK3288对应的MIPI电路设计一、LCD屏电路原理浅析LCD（Liquid Crystal Display）屏幕电路是一种采用液晶材料的平面显示技术，具有低功率、薄型轻便等特点，广泛应用于各种消费电子产品中，如手机、电视、电脑等。
LCD屏电路主要由以下几个部分组成：1.液晶显示驱动IC：负责控制液晶分子的定向和排列，使液晶屏显示出想要的图像。
2.背光源：提供背景照明，常见的背光源有CCFL（冷阴极荧光灯）和LED（发光二极管）。
3.电源电路：为液晶屏和驱动IC提供电源，通常为DC电压，具有保护功能，如过压、过流等。
4.图像信号处理电路：将输入信号经过处理转化为液晶屏可以显示的图像信号。
5.输入接口电路：包括VGA、HDMI、DVI、MIPI等接口，用于接收输入信号并传输到图像信号处理电路。
6.数据线：将图像信号传输到液晶屏，通常采用平行传输或串行传输方式。
RK3288是瑞芯微旗下一款高性能四核处理器，广泛应用于平板电脑、智能电视等领域。
它支持多种显示接口，包括MIPI（Mobile Industry Processor Interface），MIPI是一种由移动行业联盟制定的高速串行接口标准，用于连接显示器和移动设备。
对于RK3288的MIPI电路设计，主要包括以下几个方面：1.MIPI接口配置：RK3288芯片有多个MIPI接口通道，需要根据具体设计需求选择合适的通道。
在设计中需要注意各通道的电路长度和阻抗匹配，以保证信号的稳定传输。
2.时钟和数据线连接：根据MIPI接口的规范，需要将时钟信号和数据信号分别连接到液晶屏的相应引脚。
时钟信号通常是单向传输，需要使用专门的时钟插头进行连接。
数据线通常采用串行传输方式，需要使用屏带连接到液晶屏。
3.电源供应：液晶屏通常需要稳定的电源供应，所以设计中需要为液晶屏提供合适的电源电压和电源接口。
同时，还需要为驱动IC提供相应的电源。
TFT-LCD驱动电路的设计薄膜晶体管液晶显示器(TFT―LCD)具有重量轻、平板化、低功耗、无辐射、显示品质优良等特点，其应用领域正在逐步扩大，已经从音像制品、笔记本电脑等显示器发展到台式计算机、工程工作站(EWS)用监视器。
对液晶显示器的要求也正在向高分辨率，高彩色化发展。
由于CRT显示器和液晶屏具有不同的显示特性，两者的显示信号参数也不同，因此在计算机(或MCU)和液晶屏之间设计液晶显示器的驱动电路是必需的，其主要功能是通过调制输出到LCD电极上的电位信号、峰值、频率等参数来建立交流驱动电场。
本文实现了将VGA接口信号转换到模拟液晶屏上显示的驱动电路，采用ADI公司的高性能DSP芯片ADSP―21160来实现驱动电路的主要功能。
硬件电路设计AD9883A是高性能的三通道视频ADC可以同时实现对RGB三色信号的实时采样。
系统采用32位浮点芯片ADSP-21160来处理数据，能实时完成伽玛校正、时基校正，图像优化等处理，且满足了系统的各项性能需求。
ADSP-21160有6个独立的高速8位并行链路口，分别连接ADSP-21160前端的模数转换芯片AD9883A和后端的数模转换芯片ADV7125。
ADSP-21160具有超级哈佛结构，支持单指令多操作数(SIMD)模式，采用高效的汇编语言编程能实现对视频信号的实时处理，不会因为处理数据时间长而出现延迟。
系统硬件原理框图如图1所示。
系统采用不同的链路口完成输入和输出，可以避免采用总线可能产生的通道冲突。
模拟视频信号由AD9883A完成模数转换。
AD9883A 是个三通道的ADC，因此系统可以完成单色的视频信号处理，也可以完成彩色的视频信号处理。
采样所得视频数字信号经链路口输入到ADSP-21160，完成处理后由不同的链路口输出到ADV7125，完成数模转换。
ADV7125是三通道的DAC，同样也可以用于处理彩色信号。
输出视频信号到灰度电压产生电路，得到驱动液晶屏所需要的驱动电压。
6th International Conference on Sensor Network and Computer Engineering (ICSNCE 2016)Design of LCD Electric Circuit Segments Basic on MSP430Jian HuangXijing University, Xi'an 710123, ChinaKeywords: Segments LCD; MSP430; Display memory; 4-MUXAbstract. Display device is very important equipment in the instrument. LED display have limited in complex driving circuit, high dissipation, big size. In order to resolve this problem, a segments LCD drive circuit is introduced, which based on ultra-low-power MSP430, using the built-in LCD controller, can drive the 160 segment LCD. The segments LCD’s type is EDS826, it has 6 bits 8 segments LCD, display principle and 4-MUX driving methods of segments LCD is given in detail. It has design drive circuit and give software flow chart. The test results show that the device can clearly display letters and numbers, have low power dissipation, simplifies design of drive circuit, can be used in the instrument to display temperature, humidity and pressure message. IntroductionCode of LCD, or a liquid crystal screen, generally called pattern type LCD screen, each segment of the electrode includes 7 segments and a back electrode BP (or COM), you can display numbers and simple characters, digit and character corresponding to its corresponding [1-3]. Compared with the digital tube segment code, the price is basically the same, the performance and the driving principle is quite different. Compare to LED, it’s display more clear, more realistic and has lower power consumption, the contents of the display will be more abundant. So it is often used as a display unit in the instrument and meter. Produced by TI company ultra low power MSP430 microcontroller, the built-in code segment LCD driver, is the best driver code segment LCD control unit, this paper focus on the principle and method for driving code segment LCD, and accordingly gives the hardware circuit design and software driver display program.Segment Code LCD Display Principle and Its MSP430 Liquid Crystal Driving MethodLiquid crystal display often has many parameters, but the driving parameters related to the only two: one is "bias", refers to the liquid crystal display / does not show and display the signal amplitude ratio; another is duty cycle that is ratio of each segment LCD display time and display cycle [2]. MSP430F4619 has its own segment LCD driver module, including four kinds of driving module, that is static type, 2-MUX type, 3-MUX type and 4-MUX type. MSP430F4619 by setting different COM to achieve the choice of driving mode, because designers often want to use the least pin to drive the LCD segment, and therefore more use of 4-MUX drive mode.Among 4-MUX LCD driver mode, every four stroke in parallel with one common pin. As shown in Fig. 1, a, b, c, h share a root tube feet, d, e, f, g sharing another single pin, driving every digital only need 2 root segment drive pin (Fig. 1 driven by S0 and S1, number 2, driven by the S2 and S3.). 4-MUX LCD has 4 common COM3 to COM0 respectively, and the MCU connected to COM3 to COM0. In addition to V1 and V5, the 4-MUX mode driver waveform requires two intermediate voltage V2 and V4, generally by three equivalent value resistance R1, R2, R3 series making voltage divider.Figure 1. 4-MUX LCD defineDrive Circuit DesignThe driving hardware circuit mainly includes MSP430 and its peripheral circuit and liquid crystal EDS826 module. The EDS826 can display 6 digits, so MSP430 only need to select S0 ~ S11 pins. We can use the button to adjust the display contents of the LCD liquid crystal.MSP430 Introduce. The main control unit is MSP430 single chip microcomputer, because the 430 single chip microprocessor is a high performance single chip microcomputer, its power consumption is low, the interface is rich, especially suitable for the main control unit in the instrument. Because MSP430 microcontroller internal LCD controller can automatically produce all the timing of LCD through the hardware, we only need to operate the LCD control register to select the LCD driver mode [4-6]. In software design, we need to write the display buffer, it can directly control the LCD light off or light on.LCD Module EDS826. LCD module uses EDS826, it can display six digits one time, each figure and its corresponding segment code shown in Fig. 2, the LCD module using 4-MUX drive [7-8]. In the design of the hardware circuit, the actual connection diagram is shown in Fig. 3. EDS826 COM0~ COM3 connected to MSP430 COM0 ~ COM3, all other pins are connected in sequence to S0 ~ S11, according to 4-MUX driving principle, S0 and S1 driving the first tube, S2 and S3 driving the second tube, by analogy, S10, S11 drive the sixth tube. The relationship between the memory and the segment code referring to the front of this paper [7].Figure 2. EDS826 pinsFigure 3. EDS826 connected to MCUSoftware ProgramSoftware Flow Chart. Software flow chart as shown in Fig. 4, first initialization LCD, then according to the above macro definition to display 0 to 5, finally we can change the display numbers through the button.Figure 4. Software flow chartPart Code. Code below can display number 0 to 5. Compiler development environment is IAR5.0.LCDACTL = LCDON+LCD4MUX+LCDFREQ_128; // 4mux LCD,LCDAPCTL0 =LCDS0+LCDS4+LCDS8; //Segments 0-11for (i=1;i<7;i++){LCDMEM[i] = char_gen[i];}Test ResultsAccording to the above description，we design the hardware circuit and software program[9], display the results as shown in Fig. 5 and Table 1Figure 5. Display resultTable 1 The code of number 0~9ConclusionThis paper describes the principle and method of the segment code LCD in detail, using MSP430F4619 to drive the segment code LCD screen EDS826, drawing the schematic and the PCB board, using c language to program the code. Experimental results show that the digital 0 to 9 can be display clearly. According to the driving method [10], the LCD can be driven more segments, and can be used to display important information in the instrument and meter equipment. References[1]Lin Fanqiang, Ma Xiaoming. Design of the segment type LCD driver, liquid crystal anddisplay [J].2012,27 (4): 523-528[2]Li Yujie. The design of the logistics safety data recorder based on MSP430 MCU [J] displaydesign.2013,32, logistics technology LCD (4): 100-102[3]Ge Huamin, Zheng Jing, Yang Liqing. Design of LCD display module based on ARM-Linux[J], instrument technology and sensor.2009,7:75-77[4]Su peace, Chi Ke. A design method for direct driven character type [J] LCD, instrumenttechnology and sensor.2004,2:35-37[5]Xie Zhao, Zhao Jian.MSP430 Series MCU system engineering design and practice [M].Machinery Industry Press, 2009[6]Texas Instruments.MSP430x4xx Family [6] s User Guide [M]. January 2010[7]EDS826 sheet. DALIAN data GOOD DISPLAY CO. LTD,, 2012[8]Tang Sichao. Embedded system software design based on Embedded Workbench [M]. IARBeijing: Beihang University press, 2010[9]Zhang Yongbin, Hu Jingao. Control and design of LCD display based on [J]. DSP LCD anddisplay.2011, 26 (5): 626-630.[10]Wang Xinxin, Xu Jiangwei, et al. Research on TFT-LCD defect detection system [J]. Journalof electronic measurement and instrument.2014, 28 (3): 278-284.[11]Y.G. Sun, W.L. Li, D.S. Dong, X. Mei, H.Y. Qiang, “Dynamics Analysis and Active Control ofa Floating Crane”, Tehnicki Vjesnik-Technical Gazette, vol.22, no. 6, pp. 1383-1391, 2015.。
LCD电视背光驱动电路设计挑战分析和方案设计LCD电视应用中可以采用多种架构产生驱动CCFL所需的交流波形，驱动多个CCFL时所要面对的三个关键的设计挑战是选择最佳的驱动架构、多灯驱动、灯频和脉冲调光频率控制。
本文对四种常用驱动架构进行了对比分析，并提出多灯设计中解决亮度不均以及驱动频率可能干扰画面等问题的方法，并给出基于DS3984/DS3988的电路方案。
液晶显示器(LCD)正在成为电视的主流显示技术。
LCD面板实际上是电子控制的光阀，需要靠背光源产生可视的图像，LCD电视通常用冷阴极荧光灯提供光源。
其他背光技术，例如发光二极管也受到一定的重视，但由于成本过高限制了它的应用。
由于LCD电视是消费品，压倒一切的设计考虑是成本—当然必须满足最低限度的性能要求。
驱动背光灯的CCFL逆变器不能明显缩短灯的寿命。
此外，由于要用高压驱动，安全性也是一个必须考虑的因素。
LCD电视应用中，驱动多个CCFL时所要面对的三个关键的设计挑战是：挑选最佳的驱动架构；多灯驱动；灯频和脉冲调光频率的严格控制。
挑选最佳的驱动架构可以用多种架构产生驱动CCFL所需的交流波形，包括Royer(自振荡，self-oscillating)、半桥、全桥和推挽。
表1详细归纳了这四种架构各自的优缺点。
1. Royer架构Royer架构(图1)的最佳应用是在不需要严格控制灯频和亮度的设计中。
由于Royer架构是自振荡设计，受元件参数偏差的影响，很难严格控制灯频和灯电流，而这两者都会直接影响灯的亮度。
因此，Royer架构很少用于LCD电视，尽管它是本文所述四种架构中最廉价的。
图1：Royer驱动器简单，但不太精确。
2．全桥架构全桥架构最适合于直流电源电压非常宽的应用(图2)，这就是几乎所有笔记本PC都采用全桥方式的原因。
在笔记本中，逆变器的直流电源直接来自系统的主直流电源，其变化范围通常在7V(低电池电压)至21V(交流适配器)。
有些全桥方案要求采用p沟道MOSFET，比n沟道MOSFET更贵。
毕业设计（论文）任务书基于FPGA的LCD驱动显示电路的设计与实现摘要本课题主要任务是设计基于FPGA的LCD驱动电路的设计和实现，兼顾好程序的易用性，以方便之后模块的移植和应用。
控制器部分采用Verilog语言编写，主体程序采用了状态机作为主要控制方式。
最后实现使用FPGA在LCD上显示任意的英文字符和阿拉伯数字，另外要能根据输入数据的变化同步变化LCD上显示的内容。
同时要能将储存模块中的数据正常地显示在LCD上。
该课题的研究将有助于采用FPGA的系列产品的开发，特别是需要用到LCD的产品的开发。
同时可以大大缩短FPGA的开发时间。
另外，由于模块的易用性，也将使得更多的采用FPGA的产品之上出现LCD，增加人机之间的交互性，为行业和我们的生活带来新的变化。
本文中对FPGA，LCD，ModelSim，Xilinx ISE8.2i硬件设计工具等进行了简单的介绍，对其功能进行了简单的描述，并了解了LCD液晶显示器的发展历史，日常应用以及相对比于其他种类显示器的优缺点，并对基于FPGA的LCD液晶显示器驱动电路未来的发展趋势进行了展望。
关键词：FPGA，LCD，状态机，VerilogDesign and Implementation of LCD Drive DisplayCircuit based on FPGAAbstractIn this project, the main object is to design a LCD controller based on FPGA, and at the same time emphasize on the convenience for the later application and migration.The program of the controller is written by Verilog language, and the main body of the program used state machine as the primary control method. displayed picture which was put earlier.In this project, I finally realized the following function. The first one is to display any English and figureon character any position of the display screen. The second one is the display information will instantaneously update as the input data changes.The research of this project will contribute to the developing process of those products which use FPGAs, especially those products also use LCD. And at the same time, it can reduce dramatically on the developing time. In addition, for the convenience of this controller, more and more FPGA based products will come out with LCD screen. This change will enhance the interaction between human and the machine, and bring innovation to the industry and our lives.In this project, FPGA, LCD, ModelSim, Xilinx ISE8.2 I hardware design tools simply introduces its functions were a simple description, and understanding the LCD monitor the development history, and relative everyday applications than in other types of monitor based on FPGA advantages and disadvantages, and the LCD monitor driver circuit future development trends are discussed.Key words:, FPGA, LCD, State Machine, Verilog目录任务书 (I)摘要 ....................................................错误！未定义书签。
