Currently small size LCD common interface types include these three, MUC, SPI, RGB, which is widely used is basically the three kinds of interface mode, small size LCD screen has low power consumption, stable performance, low price characteristics, small size LCD screen project needs, today introduces the ICP DAS, a professional production of small-size LCD screen manufacturers.
The MCU interface standard name is I80, which is mainly used in the field of microcontroller.
The standard term for the MCU-LCD interface is the 8080 bus standard proposed by Intel.
MCU interface can be divided into 8080 mode and 6800 mode, the main difference between the two is the timing: data bit transfer 8-bit, 9-bit, 16-bit, 18-bit, 24-bit; connected to the line is divided into: CS /, RS (Register Selection), RD /, WR /, the rest of the transmission data line.
Advantages: Simple and easy control, no clock or synchronization signal required.
Cons: Takes up a lot of GRAM resources, display refresh rate is not enough for resolutions above 480×800.
MCU interface does not support 480X800 resolution LCD, now the display driver IC manufacturers, such as Wing NT35510, ILI9806 can support FULL RAM or 1/2 RAM to make up for GRAM resources, 480X800 resolutionmonitorThis is the only way to support the MCU interface and the flip-up display.
I. MCU small size LCD display
MCU interface is currently a small size LCD common interface, generally 8-bit, 16-bit and 18-bit and 24-bit transmission data bits, its operation is very simple, and do not need to synchronize data and clocks, but there are limitations, only suitable for small-size LCD, large-size displays on the very few MCU interface display. ICP DAS has introduced a display that supports 3.97" and 4.3" with 480X800 resolution. Market demand, there are solutions, display driver IC Taiwan manufacturers, such as the United Wing NT35510, ILI9806 can support FULL RAM or 1/2 RAM to make up for the GRAM resources, 480X800 resolution display, it can be done to support the MCU interface and flip display. Lian Yong NT35510 Sunplus OTM8009A QIJING HX8363B EVEREST ILI9806 above models can be a perfect solution.
| ILI9806G | 1.Supported Resolution:WVGA 2. Can be used with panel technology:a-Si 3.I/F:MIPI-DBI/MIPI-DPI/MIPI-DSI/MIDI/SPI 4. RAM or RAMLESS: Full RAM 5. Basic input/output voltage: IOVCC=1.65~3.3V; VCI=2.6~3.3V 6. Status:MP |
| NT35510 | 1.Supported Resolution:WVGA 2. Can be used with panel technology:a-Si 3.I/F:MIPI-DBI/MIPI-DPI/MIPI-DSI/SPI 16bits 4. RAM or RAMLESS: 1/2 RAM 5. Basic input/output voltage: IOVCC=1.65~3.3V; VCI=2.6~3.3V 6. Status:MP |
II. SPI small size liquid crystal display
SPI interface means serial peripheral interface. It enables the MCU and various peripheral devices to communicate with each other in a serial way, thus exchanging information.SPI has three kinds of registers: SPCR, status register and data register.The peripheral devices mainly include network controller and LCD display driver.
FLASHRAM, A/D converter and MCU, etc. SPI interface is still mainly used in FLASH, EEPROM, AD converter, real-time clock, as well as digital signal processor and digital signal decoder, SPI interface is also one of the common interfaces for small-size LCD display.
III.RGB Small Size LCD Display
RGB interface is not unfamiliar to everyone, RGB is on behalf of the three channels, R is red, G is green, B is blue, in addition to the three colors on behalf of itself, but also on behalf of the three of them to be swallowed after the addition of the color, which includes almost all the human eye can be identified by all the colors, is the current use of one of the interface of a wide range of bit, its advantages are also more prominent pad is fast, low power consumption. It is also a common interface for small-sized liquid crystal display.
For the MCU interface LCD, the internal chip is called LCD driver IC, the main function is to transform the data/commands sent by the motherboard into RGB data for each pixel, so that it can be displayed on the screen. This process does not require a dot, line, or frame clock.
MCU interface LCD Driver IC with GRAM, Driver IC as a piece of MCU co-processor, accept the Command/Data sent by the MCU, can work relatively independently. For the MCU interface LCD, its internal chip is called LCD driver IC, the main function is the main board sent data/command, transformed into each pixel of the RGB data, so that it is displayed on the screen LCD screen. This process does not require a dot, line, or frame clock.
I(intel) 8080 mode
There are five control pins for I80 mode pins: CS,RS,/WR,/RD RESET
Advantages: Simple and easy control, no clock or synchronization signal required.
Cons: It takes GRAM resources and can't do more than 480×800 resolution.
M (Motorola) 6800 mode
M6800 mode supports selectable bus width 8/9/16/18-bit (default is 8-bit), its actual design idea is the same as that of I80, the main difference is that the bus control read/write signals of this mode are combined on a single pin (/WR), and a latch signal (E) is added Data bit transmission is available in 8-bit, 9-bit, 16-bit and 18-bit.
The main difference between the MCU interface and the RGB interface is:
MCU interface mode: display data is written to DDRAM, commonly used for static picture display.
RGB interface mode: display data is not written to DDRAM, direct display, fast speed, often used to display video or animation with
