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2.4-inch TFT touch screen module with font library

Overview

Introduction

2.4-inch SPI serial TFT color screen module, 65K color, with resistive touch screen, screen driver IC is ILI9341. The onboard font chip can easily display Chinese characters on low-configuration platforms. Constant current backlight design ensures longevity.

characteristic

4-wire SPI serial communication interface, saving IO resources
With resistive touch screen
With font chip, display the complete GB2312 Chinese font with extremely low memory consumption (<0.5kB)
Constant current backlight driver ensures screen backlight lifespan
With mounting holes for easy DIY

parameter

Display area: 2.4 inches
Number of valid colors: 65536 (65k, RGB565)
Screen control IC: ILI9341
Supply voltage: 2.8~3.3V
Interface: SPI;
Maximum communication rate (actual measurement): display panel: 60Mbps; font IC: 42Mbps; touch control IC: 5Mbps
Touch type: 4-wire resistive touch; Touch control IC: XPT2046
Font IC: GT20L16S1Y/GT30L32S4W or other compatible models

Attachment description

file name	illustrate
Demo video.mp4	Function demonstration video
STM32F407VG-MiniDev-2R4LCD-Demo.zip	Sample code project file
STM32F407VG-MiniDev-2R4LCD-Demo.hex	Compiled executable binary file
ILI9341_DS_V1.02_20101206.pdf	Data sheet of display control chip ILI9341
SPEC-Z240IT010 specification v0.0(N).PDF	Panel specifications
DS_GT20L16S1Y.PDF	Specification of font chip GT20L16S1Y
Font chip GT20L16S1Y user manual.PDF	User manual of font chip GT20L16S1Y
C19076_XPT2046.PDF	Data sheet of touch control chip XPT2046

Make, test code and more

Screen link (the same model used in the ESP32 game console): Yao Yuanhong 2.4-inch tft LCD display ILI9341 7789 SPI serial port screen driver color LCD . 2.4-inch universal display modules from other merchants can generally be used as long as the interface and packaging are correct.

The provided sample code is compatible with the font IC GT20L16S1Y. If you use other models of font IC, you need to add the proprietary driver code of the font IC based on the provided driver. The reserved pads on the screen support two font ICs: GT20L16S1Y/GT30L32S4W. If there are other compatible models, you can also choose them as needed.

Link to the development board used in the demonstration video: STM32F103/205/407Vx small development board , the MCU model is STM32F407VG. If you use this development board, the screen module can be directly plugged into the board for use.

The sample code is written using CubeIDE. If you are using the same development board, you can compile, download and use it normally after directly importing it into CubeIDE.

If you are using other compatible STM32F407 development boards or do not want to compile the code, you can also directly download the compiled binary file "STM32F407VG-MiniDev-2R4LCD-Demo.hex" in the attachment. Please make sure your MCU model is STM32F407VE/VG or STM32F407ZE/ZG or other compatible models, then connect your development board and screen as follows

screen pins	Development board/MCU IO	illustrate
GND	GND	power supply ground
VCC	3.3V	Power supply, voltage range 2.8~3.3V
CL(SCLK)	PB3	SPI clock
SI(MOSI)	PB5	SPI master output slave input
SO(MISO)	PB4	SPI master input slave output
DC	PE1	LCD controller data/command selection
RST	PB8	LCD controller reset (active low)
BLK	PD9	LCD panel backlight control (active high level, pull-up by default)
CS	PB6	LCD controller chip select (active low level)
TP	PB7	Touch interrupt input signal, pulled up by default, automatically pulled down when the screen detects a touch
TCS	PD10	Chip select signal of touch control IC (active low level, pull-up by default)
WCS	PD8	Chip select signal of font IC (active low level, pull-up by default)

Precautions

Notice! ! ! ! Because the screen module is connected to 3 devices on the same SPI bus, it needs to be time-shared through the CS pins of the devices. At most one device's CS chip select signal can be active (low level) at the same time. It is strictly prohibited to pull two or more CS signals low at the same time, otherwise there is a risk of damaging the screen module. Please pay strict attention when writing your own driver code!

Sample code function description

project	Function
LCD panel inspection	Display solid colors, gradients and pictures to check whether the LCD panel has dead pixels and evaluate the display effect. Please click on the screen to switch. It will automatically exit after all projects are tested.
Touch screen calibration	Use this feature if you find that your touch is offset. Follow the on-screen prompts and click on the center of the cross to complete the calibration.
Touch function test (drawing board)	A simple free drawing program that can be used to test touch screen functionality. You can select colors and brushes on the left side above, and click the X in the upper right corner to exit.
Font IC function demonstration	Demonstrates the display effects of different character sets and fonts in the font chip GT20L16S1Y. Please click on the screen to switch. It will automatically exit after all projects are tested.

picture

Front view

Rear view

Function Demonstration Figure 1 (Drawing Board)

Function demonstration picture 2 (GB2312 Chinese character display)

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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