Tap the thumbs up for good fortune, follow us to stay on track, when you see Old Chen discussing chips, the industry, and humanity, may we meet like the Dabaosod honey, see you every day!After discussing the “working principles of TFT-TCON chips”, “disassembly analysis principles of TFT-LCD screens”, “the history of TFT-LCD screen interface protocols”, and “3.5-inch TFT-LCD display chips”, this industry will still use dedicated display control chips. Today, let’s talk about dedicated display control chips!Having discussed many concepts, I still find it hard to distinguish them, so I will organize and explain the names!Display Driver Chip:The chip is on the panel, converting the received protocol into TFT control levels.Display Chip (Serial Screen Chip):MCU + TFT Controller combined into one. Many high-performance CPUs with sufficient frequency can support the screen interface, allowing the TFT Controller chip to be omitted.Display Control Chip:Removes the MCU, leaving only the TFT control chip, which can only listen to commands and continuously send data to the display driver chip.
Structure of the Display Control Chip:With 8/16-bit MCU interface; or RGB screen with SPI interface.
Every chip development has historical origins. The classic models SSD1963 and RA8875 established the field of display control chips. First, let’s introduce the predecessors.SSD1963: Developed by Crystal Gate Technology, a publicly listed company in Hong Kong, which split from Motorola’s Hong Kong Wanli Semiconductor.RA8875: RAIO Technology, a publicly listed company in Taiwan, mainly produces display driver chips and display control chips.Why did such products emerge?Answer: This calculation dates back over twenty years. The development of TFT technology has been rapid, and TFT control requires a lot of RAM and computing power. At that time, MCUs/CPUs could not meet the demand, and problems meant opportunities. FPGA implementation led to productization, thus dedicated display control chips emerged.Why is there still an opportunity for display control chips?Answer: Letting screen driving work be handled by professionals allows you to focus on what you do best. Of course, if you excel in everything, just choose a high-performance CPU and do it yourself.
Display Control Chip
Chip Block Diagram
Working Block DiagramBasic Parameters:1. Supports SPI, I2C serial and 8/16-bit MCU parallel interfaces.2. Built-in JPG hardware decoder.3. Built-in 2D BitBLT graphics acceleration engine, providing image display functions with ROP raster operations, PIP (Picture-in-Picture) functionality, and graphic blending transparency display functions.4. Built-in geometric drawing engine, supporting point, line, curve, ellipse, triangle, rectangle, and rounded rectangle drawing functions.5. Built-in high-capacity 128Mb display memory, supporting multiple displays and switching the main display window in the display buffer.6. Supports 16/24 bits RGB interface displays from 480*480 to 1280*1024, color αRGB 8:8:8:8 display data.7. Provides high-speed QSPI interface to copy data from external QSPI Flash to the frame buffer, supporting Nand Flash bad block handling.8. Built-in 2 sets of 16-bit PWM Timers.9. Provides three power-saving modes: standby, sleep, and deep sleep.10. Built-in programmable PLL for LCD scanning, SDRAM, and internal system timing.
System Architecture:STM32F407 + LT7586Suitable for those who have not developed TFT-LCD screens; you just need to develop the STM32F407, and leave the rest to the display control chip. The hardware is unique to you, suitable for special screen applications. See the system architecture diagram!A WeChat group for discussing chips has been created. The QR code is valid for 7 days. If the QR code expires, please message Old Chen.
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