Character LCD and Graphic LCD
The dot matrix LCD module is a simple monochrome display that can be broadly divided into two types according to the integration of the driver controller: COB and COG，Usually the character screen is COB and the graphic screen is COG
What is character lcd？
Dot matrix LCD is a display in which pixels are arranged in a certain order and can display white, green or blue depending on the color of the backlight. The dots can be controlled to display text or graphics and can be software controlled to enable scrolling functions.
What is Arduino LCD1602？
Arduino LCD1602 refers to 1602 dot matrix screen, which is a kind of dot matrix LCD module specially designed to display letters, numbers, symbols, etc.
what is Graphic?
A graphic display is a low-resolution display with a simple structure. There is no color filter, so only black or white can be displayed, usually in TN or STN display mode
How to use 12864 character lcd/ dot matrix screen ？
Correspondence of pixels and data
Each dot on the display corresponds to a bit in the display cache RAM in the controller chip.The 64X128 dots on the display correspond to the 8 Pages of the display RAM, and each Page has 128 bytes of space to correspond. Therefore, it is known that a Page space in the display RAM area corresponds to 8 rows of dots, and a byte of data in the Page corresponds to a column.
How to display a dot on character lcd
We define the point in the upper left corner of the screen as the coordinate (0, 0), which corresponds to the first byte of Page0 data, and the exact position is on the bit 0 of this byte data (bit0). In this way, we can write 0x01 data to the video memory with row address (Page) 0 and column address 1 to light up the point (0, 0) in the program.
Difference between character screen and graphic screen
The COB method board comes with a font, while the COG one does not, so the character display is more suitable for displaying text, while the COG display can be fully controlled by you and can display any content
Structure of the character lcd/dot matrix /dot matrix module
Usually we see the LCD module, divided into several parts: LCD, backlight, PCB board; and the backlight and PCB board part is actually optional, depending on the specific LCD module. Dot matrix LCD is divided into two types according to the location of the driver IC: COB and COG; COG is actually the driver control IC integrated in the LCD surface; COB is also the driver control IC integrated in the PCB board
character lcd Module Interface Description
1.LEDK ：Backlight negative input
2.NC ：empty
3.C86 ：Parallel interface selection
4.PS ：Serial/parallel interface selection
5.Clock ：signal enable pin (EP) for EP 6800 series MPU
6.WR ：Read/write control signal
7.A0 ：Data command select pin
8.Reset : reset pin
9.CS : chip select (active low)
10.LEDA ： Backlight positive input
11.GND ：ground
12-19.DB7~DB0 ：8-bit data bus
20.+3.3V ：LCM supply
Character/Graphic Screen Products
| INCH | Display Mode | Resolution | Compatible drive IC | display color |
| 1.20 | FSTN | 128×64 | ST7567 | black/white/blue |
| 1.30 | FSTN | 132×32 | ST7567 | black/white/blue |
| 1.30 | FSTN | 132×32 | ST7567 | black/white/blue |
| 1.80 | FSTN | 126×64 | ST7567 | black/white/blue |
| 1.90 | FSTN | 132×32 | ST7567 | black/white |
| 2.00 | FSTN | 128×64 | ST7567 | black/white/blue |
| 2.40 | FSTN | 128×64 | ST7567 | black/white/blue |
| 2.50 | FSTN | 128×64 | ST7567 | black/white/blue |
| 2.26 | FSTN | 128×64 | ST7567 | black/white/blue |
| 2.90 | FSTN | 240×160 | UC1611 | black/white |
| 3.00 | FSTN | 128×64 | ST7567 | black/white/blue |
| 3.10 | FSTN | 128×64 | ST7567 | black/white/blue |
| 3.30 | FSTN | 160×160 | UC1611 | black/white |
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Frequently Asked Questions
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Character screen has a font chip on the circuit version, which can be called by software, graphic LCD can only display the text or pictures you send, there is no font chip
Character LCDs are displays with font chips, which are ideal for displaying text because they do not need to design text pixel by pixel and can directly call the text in the font.
It represents a 16×2, 32 pixels, monochrome display with font,and is a very common character display
The size of the characters displayed on the character display is related to the arrangement of the pixels, one pixel is about 0.4mmx0.4mm, if you need larger characters you can use more pixels to display the characters
SPI stands for Serial Peripheral Interface, and small, low-resolution displays often use this interface for communication.
