tft lcd driving circuit made in china

STONE Technologies is a proud manufacturer of superior quality TFT LCD modules and LCD screens. The company also provides intelligent HMI solutions that perfectly fit in with its excellent hardware offerings.

STONE TFT LCD modules come with a microcontroller unit that has a 1GHz Cortex-A8 CPU. Such a module can easily be transformed into an HMI screen. Simple hexadecimal instructions can be used to control the module through the UART port. Furthermore, you can seamlessly develop STONE TFT LCD color user interface modules and add touch control, features to them.

The famous china LCD display manufacturers. It is the world’s leading semiconductor display technology, products, and services provider. Products are widely used in mobile phones, tablets, laptops, monitors, televisions, cars, digital information displays, and other display fields.

Focus on the development and production of china HMI (Intelligent TFT LCD Module) LCD display manufacturers, production, and sales of LCD display modules for 16 years. The company master TFT LCD technology and software system. The main products are industrial electronic series, advanced series, and civil and commercial series. Application scenarios include automation systems, medical beauty equipment, vending machines, smart lockers, energy, and power equipment (refueling machines, charging piles), elevators, smart homes, and offices, measuring instruments, public transportation, etc.

Mainly committed to the r&d, production, and sales of TFT-LCD/stn-LCD /OLED display modules, it is a modern high-tech enterprise that provides a full range of product LCD module technology and manufacturing support services for TCL group member enterprises and international electronic enterprises.

Set an LCD display module (LCM), capacitive touch screen (CTP), fully integrated touch display module (TDM), LCD thin technology development, production, and service in one national high-tech company.

Domestic size of the top four small and medium-sized flat panel display manufacturers. The products cover medium and small-size TFT-LCD display modules and high-precision miniature cameras, which have been widely used in the fields of smartphones, medical treatment, and industrial display.

The LCD business division is specialized in the r&d, production, and sales of the LCD display (LCD) and LCD module (LCM) series of products. It has ten semi-automatic COG production lines, 1.5KK of monthly COG products, covering COG, TAB, COB, and other LCD module products, TFT, CSTN, and other color LCD display products, and OLED display products. touch screen manufacturers.

Byd IT products and business mainly include the establishment of rechargeable batteries, plastic parts, metal parts, hardware, and electronic products, mobile phone keys, microelectronics, LCD display module, optoelectronic products, flexible circuit board, chargers, connectors, uninterruptible power supply, dc power supply, solar energy products, mobile phone decoration, mobile phones ODM, mobile phone test, assembly operations, laptop, ODM, manufacturing, testing and assembly operations, etc.

Star source products cover backlight, LCD, optical diaphragm, etc., widely used in LCD modules, photo frames, tablets, portable, instruments, and meters.

The company has long invested in the research and development of the TFT-lcm LCD module, focusing on consumer products and industrial control products. Currently, 3.5-11.6 inch modules are available, among which 4.0, 4.3, 5, 6, and 10.1-inch products have reached the leading level in the industry. Products are mainly used in vehicles, mobile TV, PMP, DVD, EPC, security, and industrial control products.

Professional development, design, production, and sales of LCD display module (LCM), products cover COB, TAB, COG, and other LCD module products, TFT, CSTN, and other color LCD display products, as well as OLED display products. Products are widely used in mobile phones, communications, digital products, household appliances, industrial control, instrumentation, vehicle display, color screen display, and other fields.

Mainly engaged in research and development, manufacturing, and sales of the LCD display and LCD display module. Products are widely used in all kinds of electronic products and equipment HMI interface, such as medical equipment, instruments and meters, audio, household appliances, telephone and clocks, game machines, and other different types and use.

Focusing on the LCD module industry, is a collection of research and development, manufacturing, sales as one of the high-tech enterprises. TFT module size from 1.44 to 7 inches, product specifications cover QVGA, WVGA, qHD, HD, etc., the market prospects are broad.

The display manufacturers company mainly researches and develops the LCD display, charger, battery, and other products of mobile communication mobile phone, telephone, MP3, and other high-tech products.

The company integrates research and development, design, production, sales, and service into one, and provides comprehensive touch and display integrated solutions for the complete machine touch screen manufacturer of smartphones, specializing in the development and manufacture of Sensor sensors, capacitive touch screens (GFF/OGS/GG), small and medium-sized LCD (TN/HTN/STN/CSTN/TFT) and corresponding modules and glass cover plate products. The company’s products are widely used in communication terminals (smartphone, tablet computer, etc.), household appliances, car electronics, digital products, and other industries, exported to Europe and America, Japan and South Korea, Singapore, and other countries.

Mainly produces medium and small-size LCD display module (LCM), multi-point capacitive touch screen (CTP), and other high-tech products. At present, more than 1000 models of 1.2-12.1 inch products have been developed. Products are widely used in mobile phones, GPS, mobile TV, tablet computers, digital photo frames, e-books, and other consumer electronics.

It is a professional development and production of small and medium-sized flat panel display upstream materials manufacturers. The company’s main products include LCD display panels, color filter, ITO conductive glass (CF), TFT LCD panel, and capacitive touch screen with multi-touch control functions (sensor and the final module), can provide complete medium and small size flat-panel display device using the solution of raw materials, product specifications varieties complete, widely used in 10.4 inches below the smartphone, tablet, PMP, digital camera, digital camera, GPS and other products of the display panel.

Now it is divided into mobile phone business division: the main products are (2.8-6) inch and the LCD screen and capacitive screen all fit together.MID tablet computer and ultrabook computer division: the main production product size is (7-15) inch capacitive touch screen.

Committed to 3.5~4.3 inches, 5 inches, 5.88 inches, 6.2 inches, 7.0 inches, 8.0 inches, 9.7 inches, 10.1 inches, 12.1 inches medium size FOG, backlight process production, products should be widely used in high-end communication phones, tablets, notebook computers, car TV, navigator, and other display products. automotive LCD display touch screen manufacturers.

The company has an injection molding business division, SMT business division, FPC business division, backlight business division, irrigation crystal business division, TFT module business division, SIN module business division, products involving touch screen, LCD display module, backlight, black and white screen, flexible circuit board.

Engaged in the laptop, tablet, smartphone, computer high-performance board card, LCD module, and other electronic products research and development, production, and sales of high-tech private enterprises.

Is a professional engaged in LCD display module, electronic components, production, design, research and development, sales as one of the high-tech enterprises. Products are widely used in mobile phones, game consoles, PDA, portable DVDs, video phones, intercom doorbells, car video, industrial control medical, and other fields.

STONE provides a full range of 3.5 inches to 15.1 inches of small and medium-size standard quasi TFT LCD module, LCD display, TFT display module, display industry, industrial LCD screen, under the sunlight visually highlight TFT LCD display, industrial custom TFT screen, TFT LCD screen-wide temperature, industrial TFT LCD screen, touch screen industry. The TFT LCD module is very suitable for industrial control equipment, medical instruments, POS system, electronic consumer products, vehicles, and other products.

When compared to the ordinary LCD, TFT LCD gives very sharp and crisp text/graphic with shorter response time. TFT LCD displays are used in more and more applications, giving products better visual presentation.

TFT is an abbreviation for "Thin Film Transistor". The color TFT LCD display has transistors made up of thin films of Amorphous silicon deposited on a glass. It serves as a control valve to provide an appropriate voltage onto liquid crystals for individual sub-pixels. That is why TFT LCD display is also called Active Matrix display.

A TFT LCD has a liquid crystal layer between a glass substrate formed with TFTs and transparent pixel electrodes and another glass substrate with a color filter (RGB) and transparent counter electrodes. Each pixel in an active matrix is paired with a transistor that includes capacitor which gives each sub-pixel the ability to retain its charge, instead of requiring an electrical charge sent each time it needed to be changed. This means that TFT LCD displays are more responsive.

To understand how TFT LCD works, we first need to grasp the concept of field-effect transistor (FET). FET is a type of transistor which uses electric field to control the flow of electrical current. It is a component with three terminals: source, gate, and drain. FETs control the flow of current by the application of a voltage to the gate, which in turn alters the conductivity between the drain and source.

Using FET, we can build a circuit as below. Data Bus sends signal to FET Source, when SEL SIGNAL applies voltage to the Gate, driving voltage is then created on TFT LCD panel. A sub-pixel will be lit up. A TFT LCD display contains thousand or million of such driving circuits.

Topway started TFT LCD manufacturing more than15 years ago. We produce color TFT LCD display from 1.8 to 15+ inches with different resolutions and interfaces. Here is some more readings about how to choose the right TFT LCD.

Checking a TFT lcd driver is very messy thing especially if its a Chinese manufactured TFT. TFT’s that are supplied by Chinese manufactures are cheap and every body loves to purchase them since they are cheap,but people are unaware of the problems that comes in future when finding the datasheet or specs of the particular TFT they purchased. Chinese manufactures did not supply datasheet of TFT or its driver. The only thing they do is writes about the TFT driver their lcd’s are using on their websites. I also get in trouble when i started with TFT’s because i also purchased a cheap one from aliexpress.com. After so many trials i succeeded in identifying the driver and initializing it. Now i though to write a routine that can identify the driver.

I wrote a simple Arduino Sketch that can easily and correctly identify the TFT Lcd driver. I checked it on 2.4, 3.2 and 3.8 inch 8-bit TFT lcd and it is identifying the drivers correctly. The drivers which i successfully recognized are ILI9325, ILI9328, ILI9341, ILI9335, ST7783, ST7781 and ST7787. It can also recognize other drivers such as ML9863A, ML9480 and ML9445 but i don’t have tft’s that are using this drivers.

The basic idea behind reading the driver is reading the device ID. Since all the drivers have their ID’s present in their register no 0x00, so what i do is read this register and identify which driver tft is using. Reading the register is also a complex task, but i have gone through it many times and i am well aware of how to read register. A simple timing diagram from ST7781 driver explains all. I am using tft in 8-bit interface so i uploaded timing diagram of 8-bit parallel interface. The diagram below is taken from datasheet of ST7781 tft lcd driver.

The most complex tft i came across is from a Chinese manufacturer “mcufriend”. mcufriend website says that they use ILI9341 and ILI9325 drivers for their tft’s. But what i found is strange their tft’s are using ST7781 driver(Device ID=7783). This is really a mesh. I have their 2.4 inch tft which according to their website is using ILI9341 driver but i found ST7783 driver(Device ID=7783). The tft i have is shown below.

I am using Arduino uno to read driver. I inserted my lcd on arduino uno and read the driver. After reading driver i am printing its number on Serial Monitor.

Note:On serial monitor driver number will be displayed like if your lcd is using ST7783 controller than on serial monitor 7783 will be displayed or if tft is using ILI9341 than on 9341 will be displayed.

The code works on Arduino uno perfectly but if you are using any other board, than just change the pin numbers according to the board that you are using also check out for the Ports D and B. TFT Data Pin D0 is connected to Port-B Pin#0 and D1 is connected to Port-B Pin#1. TFT Data Pins D2 to D7 are connected to Port-D Pins 2,3,4,5,6,7. So if you are using Arduino mega than check for the Ports D and B and Make connections according to them. Arduino mega is working on ATmega2560 or ATmega1280 Microcontroller and Arduino uno is working on ATmega328p Microcontroller so both platforms have ports on different locations on arduino board so first check them and then make connections. The same process applies to all Arduino boards.

DS024BOE39N-002 is a 2.4inch normally black, it applies to 2.4" color TFT-LCD panel. The 2.4inch color TFT-LCD panel is designed for translator, smart home, GPS, camcorder, digital camera application, industrial equipment device and other electronic products which require high quality flat panel displays, excellent visual effect. This module follows RoHS.

DISEN is a professional TFT(Thin Film Transistor) module manufacturer. There are different models of our TFT active matrix display with various features. Whether you need TFT display with control board, high brightness, wide viewing angle, monochrome, bar type, we have some options for you to choose from. We also offer customization service of backlight and FPC. The available diagonal sizes of our standard TFT display modules are 0.96", 1.77" 2.4", 2.8", 3.5", 3.9", 3.97", 4.3", 5", 5.6", 5.7", 6.2", 7", 8", 8.9", 9", 10.1", 10.4", 11.6”,12.1”, 12.3”, 13.3”, 14”, 15” and 15.6”.

The basic thought of the utility model is: in the Vcom of TFT-LCD mu balanced circuit; Through between dc voltage conversion unit and Vcom load end, connecting feedback control unit; This feedback control unit can dynamically be adjusted the Vcom value of output according to the fluctuation of output Vcom value, thereby the Vcom that passes through the Vcom voltage generation circuit structure assurance output of the existing TFT-LCD of change stablizes; Simple possible, and cost is low.

The Vcom mu balanced circuit of a kind of TFT-LCD that the utility model provides; With reference to shown in Figure 1; Mainly can comprise: dc voltage conversion unit 11, feedback control unit 12, Vcom load end 13, Vcom produce end 14; Wherein, One end of Vcom load end 13 connects the output terminal of said dc voltage conversion unit 11, and the other end connects the end that said Vcom produces end 14 and feedback control unit 12, and the other end of said feedback control unit 12 connects the Voltage Feedback pin of said dc voltage conversion unit 11.

Wherein, As shown in Figure 2; Said feedback control unit 12 can comprise semiconductor field effect transistor (metal-oxide-semiconductor) 21 and metal-oxide-semiconductor 21 driving circuits; Wherein, the grid of said metal-oxide-semiconductor 21 connects the output terminal of said metal-oxide-semiconductor 21 driving circuits, and the said metal-oxide-semiconductor 21 of said metal-oxide-semiconductor 21 driving circuit drives is operated in degenerative linear amplification district; The input end of said metal-oxide-semiconductor 21 driving circuits connects said Vcom load end 13, and the drain electrode of said metal-oxide-semiconductor 21 connects the Voltage Feedback pin VFB of said dc voltage conversion unit 11.

Particularly; As shown in Figure 2; Said metal-oxide-semiconductor 21 driving circuits comprise operational amplifier 22, first resistance R 8, second resistance R 9 and direct supply Vcc, and the inverting input of operational amplifier 22 connects Vcom load end 13, and in-phase input end connects first resistance R 9 and second resistance R 8; First resistance R 8 connects direct supply Vcc, second resistance R, 9 ground connection.

Wherein, as shown in Figure 2, input voltage VI converts output voltage VO into through dc voltage conversion unit 11; Dc voltage conversion unit 11; Be the DC converting chip, need 2 control pin: enable EN and feedback voltage pin VFB at least, enable EN control direct current exchange chip operate as normal; Voltage Feedback pin VFB is used to receive extraneous feedback signal, and any change in voltage of Voltage Feedback pin VFB all can trigger the variation of output voltage VO.In the practical application, other surface-mounted integrated circuits of DC converting unit further (IC, Integrated Circuit) realize that this IC adjusts output through a FB pin, and principle of work is identical with the DC converting chip.

Accordingly, the utility model also provides a kind of display device, and this display device includes the mu balanced circuit of above-mentioned TFT-LCD Vcom voltage.

The economic rebound in the first quarter of 2009 was mainly due to LCD TV. The economic recession of Europe and America will only make consumers reduce the consumption on such necessities in the late phase. Although Europe and America suffered economic recession, the market shares of LCD TV did not fluctuate much because of manufacturers’ promotion strategies, WON depreciation and further development of LCD TV in the first quarter of 2009. With the push of China and other emerging countries, the market rebounded significantly. Japanese enterprises were panicked and reduced production greatly when economic recession arose, resulting in short supply. This strong rebound was still lack of powerful support, especially in emerging countries. In China, when the property market begins to rebound, real estate sales will promote the consumption on home appliances. In the mid and late rebound phase of the property market, consumers will wait and see, and real estate sales will decline, so that home appliances consumption will also drop. The unemployment rate is still rising in Europe and America and economic recession has not ended, so if consumers are aware of the fact, they will certainly cut expenditure.

From Q1 2005 to Q4 2010, the fluctuation of TFT-LCD industry seems to be magnified, but the fact is not. The global economy has experienced the most significant recession since the Great Depression in 1929. TFT-LCD industry is the upstream of consumer electronics and IT industry, and the two industries always follow the trend of the global economy. Excluding external factors, the fluctuation of TFT-LCD industry is lessened, especially the extent of decline shrinks, which is because LCD TVs develop rapidly, IT industry is relatively stable and notebook computers develop well. Before 2000, 80% of TFT-LCDs were used in notebooks, thus on which TFT-LCD industry was highly dependent, and then TFT-LCD industry fluctuated a lot. In the future, LCD TV industry, Netbook industry and LED notebook industry will enter the mature stage, which will make TFT-LCD industry tend to fluctuate less, but on the other hand, the industry will lack growth momentum.

TFT-LCD industry relies heavily on upstream raw materials and components. In the cost structure of TFT-LCD, upstream components account for 70-85%. Therefore, to be cost-efficient shall be supported by the strong upstream, but for Chinese enterprises, it is hard to do so. In many Chinese enterprises, including joint ventures, profit is often transferred to the upstream. In addition to glass substrates, Taiwan has nearly all of upstream industrial chains, which is the biggest driver for Taiwan"s success in TFT-LCD industry. TFT-LCD industry can prompt a huge industrial chain. Japanese manufacturers occupy the top position in the industrial chain, and they usually sell their technology rather than products. Almost every Taiwanese manufacturer in the upstream industrial chain has received technical support from Japan, so do South Korea manufacturers. Taiwanese manufacturers’ success lies in fast access to market through technology licensing, while Japanese manufacturers rely on supporting Taiwanese enterprises to combat South Korea rivals. Japanese manufacturers still master the upstream firmly.

TFT LCD modules are thin film field effect transistors. The so-called thin film transistor means that each liquid crystal pixel on the liquid crystal display is driven by a thin film transistor integrated behind it so that it can display screen information with high speed, high brightness, and high contrast. The composition of the liquid crystal display is not complicated. The liquid crystal panel plus the corresponding driving board (also called the main board, whose compositional structure is not intended to be the row and column driving circuit in the liquid crystal panel), power supply board, high voltage board, button control board, etc., constitute a complete liquid crystal display.

Power supply part: The power supply circuit of the liquid crystal display is divided into two parts: switching power supply and DC/DC converter. Among them, the switching power supply is an AC/DC converter, its function is to convert the AC 220V or 110V (European standard) into a 12V DC power supply (some models are 14V, 18V, 24V, or 28V), supply DC/DC Converter and high-voltage board circuit; DC/DC DC converter is used to convert the DC voltage (such as 12V) generated by the switching power supply into 5V, 3.3V, 2.5V and other voltages, which are supplied to the driver board and the liquid crystal panel.

The driver board of the TFT LCD screen is also called the main board, which is the core circuit of the liquid crystal display. It is mainly composed of the following parts: input interface circuit, A/D conversion circuit, clock generator, Sealer circuit, microcontroller circuit, and output interface circuit.

Key board part: The key circuit is installed on the key control board, and the indicator lights are generally also installed on the key control board. The function of the key circuit is to make the circuit on and off. When the switch is pressed, the key electronic switch is turned on, and when the hand is released, the key electronic switch is turned off. The switch signal output by the key switch is sent to the MCU on the driver board. After being recognized by the MCU, the control signal is output to control the relevant circuit to complete the corresponding operation and action.

High-voltage board part: The high-voltage board is commonly known as a high-voltage strip (because the circuit board is generally long and in the form of a strip), and is sometimes called an inverter circuit or an inverter. Its function is to convert the low-voltage DC voltage output by the power supply into a liquid crystal panel ( The high-frequency high-voltage AC above 600V required by the Panel) that lights the backlight on the LCD panel. The high-voltage board of the TFT LCD screen mainly has two installation forms: 1. A dedicated circuit board; 2. It is installed together with the switching power supply circuit (the switching power supply adopts the internal type).

LCD panel part: The LCD panel is the core component of LCD, mainly including the LCD screen, LVDS receiver (optional, LVDS LCD screen has this circuit), driver IC circuit (including source driver IC and gate driver IC), timing sequence Control IC (TC0N) and backlight.

Driven by growing demand, TFT-LCD’s manufacturing capacity in China has been experiencing a continued growth rate ranging between 20 to 30% per year. This trend is expected to continue during the coming years as result of coming upgrade cycles in display devices. Beijing Oriental Electronics Technology Group (BOE) and Tianma Microelectronics Co. Ltd rank among the world top TFT-LCD manufacturers.

Air Liquide and BOE recently signed a long-term supply agreement for BOE’s new 4.5-generation TFT-LCD fab in Chengdu high-tech industrial park, in the capital city of Sichuan Province. Under the terms of the agreement, Air Liquide will supply its global offer covering carrier gases (nitrogen, oxygen, hydrogen and argon), specialty gases, Total Gas Management and all equipment and installations related to gas supply. The decision made by BOE to choose Air Liquide’s global solution is the result of a long term partnership between both companies.

Tianma Microelectronics awarded Air Liquide the supply of all the carrier gases to its new 4.5-generation TFT-LCD project in Chengdu. This is the first time Air Liquide and Tianma enter into a partnership.

Francisco Martins, Vice-President World Business Line Electronics of the Air Liquide Group, declared: “We are proud to serve the leading players of TFT-LCD in China and therefore reinforcing our position as market leader. This investment will allow our first foothold in Chengdu, one of the most important markets in the South West of China and, at the same time, illustrates Air Liquide’s commitment to contribute to the economic reconstruction of the Sichuan earthquake area. In the current economic context, High Tech and Emerging economies such as China are long-term growth drivers for the Group.”

Established in 1993, has been listed in Shenzhen Stock exchange since 1997. Since then, it has shifted its business from the traditional consumer electronics market to the communications, computer and digital product fields. Currently, BOE is the largest domestic and the world’s No. 9 largest TFT-LCD manufacturer, with a total revenue exceeding 10 billion Yuan in 2007. In 2007, BOE started to build a 4.5-generation TFT-LCD fab in Chengdu with a total investment of 3 billion Yuan.

Founded in 1983 in Shenzhen, Guangdong Province of China, is primarily engaged in the manufacture and sale of liquide crystal displays (LCD) and liquid crystal modules (LCM). The company has established subsidiaries in Shanghai as well as in the United States, South Korea and Europe respectively. In July 2008, Tianma announced its new investment in Chengdu. It’s another 4.5-generation TFT-LCD fab with a total investment of 3 billion Yuan.