What is 2.4″ TFT LCD Display Module? The word TFT LCD stands for thin film transistor liquid crystal display, its name shows that, this type of LCD display made up with TFT technology. In this technology every pixel of light has its own transistor which controls each activity of light pixel individually. Therefore, it is also known as with another name such as active matrix display. Basically, it is an advanced technology in the field of LCD display which offers the best quality image and consume less power as compared to other LCD displays such as CRT (cathode ray tube) displays. This types of LCD display are mostly used in consumer appliances such as in computer monitors, televisions , projectors, mp3 players and mobiles phones etc. These are easily available in market or online shop. A simple TFT LCD display module is shown in figure 1
Figure 1 Simple 2.4″ TFT LCD Display Module
Pin Configuration of 2.4″ TFT LCD Display Module
2.4″ inch TFT LCD display module is a 28 pins module and all pins are used in each configuration mode. Normally it is used in two configuration modes, first one is SPI mode and second one is 8 bit mode, but it cannot be used in both modes at same time. It is used in SPI mode in that time when speed is not so much major issue ,means it is slower mode as compared to 8 bit mode because the user sends only one bit at one time instead of 8 bit. Therefore 8 bit mode is also called parallel mode. Its pin configuration is shown in figure 2
Figure 2 Pin Configuration of 2.4″ TFT LCD Display Module
Here we shell only explain the pin configuration mode of this TRT LCD display module when it is used in 8 bit mode. In this mode the user sends 8 bit at same time instead of 1 bit and this is so much faster mode its pin configuration detail is shown in table 1
No. of pins
|GND||This is power and signal ground pin. It connected to source ground
|Vin||This is power pin and it is connected to 3.3 V or 5V dc source|
|CS||This is chip selection pin and it is used for 8 bit chip selection.|
|C/D||This pin is used for data selection and it is same as SPI CLK pin.|
|WR||This is write strobe pin and is used for writing the data.
|RST|| This is reset pin and is used for resetting the module .
|RD||This read strobe pin and is used for reading the data.|
|D0 to D7||These are data send pins and are used for sending 8 bit parallel data.|
Working Principle of 2.4″ TFT LCD Display Module
The working principle of this TFT module is very simple. Each panel of TFT LCD module consists of many pixels and each pixel emits different colure of light. At the back end of these pixels a back light is used which consists of number of fluorescent tubes. Similarly, for lighting the single pixel, it is passed through back light door or shutter. When it is passed through this back light door or shutter then its light is increased. We have explained this in a simple way but so much complications are involved in this whole technology process.
How to Interface 2.4″ TFT LCD Display Module with Arduino Board?
A controller is required for displaying any thing at 2.4″ TFT LCD module. Here we will explain how interface the TFT LCD module with Arduino board. For interfacing with this 2.4″ TFT LCD module with UNO Arduino board, connections are made according to above table. After connecting according to above table, Arduino board is powered up with the help of ac to dc adapter. When it is powered up then TFT LCD display is also powered up at same time because it is connected with this Arduino board. After that ,program is up load in this Arduino board with the help of Arduino IDE software .Similarly for writing any program Arduino library is used ,at which any type of program could be easily write.