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1.3inch Memory LCD
User Manual
OVERVIEW
This is a black/white bicolor LCD display module with embedded memory, 1.3inch
diagonal, 144x168 resolution, communicating via SPI interface.
It features lower power consumption compared to normal LCDs, and higher
refresh rate compared to e-Papers without "ghosting" issue.
FEATURES
⚫ 144x168 resolution, high contrast rate, clear displaying
⚫ SPI interface, requires minimum GPIO for controlling
⚫ Low power consumption, wide viewing angle, still viewable even under sunlight
⚫ Comes with development resources and manual (examples for Raspberry
Pi/Arduino/STM32)
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SPECIFICATIONS
LCD type
: Memory LCD
Interface
: SPI
Display color
: black, white
Resolution
: 144x168
Display size
: 20.88mm × 24.36mm
Operating voltage
: 3.3V / 5V
Power
: 1mW (typ.)
LCD type
: Memory LCD
INTERFACES
PIN NO.
SYMBOL
DESCRIPTION
1
VCC
Power (3.3V / 5V input)
2
GND
Ground
3
MISO
Module SPI data output
4
MOSI
Module SPI data input
5
SCLK
Module SPI clock input
6
LCD_CS
Memory LCD chip selection
7
RAM_CS
SPI RAM chip selection
8
DISP
Display on/off signal
9
EIN
External Vcom signal
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CONTENT
Overview........................................................................................................................................................................ 1
Features ................................................................................................................................................................ 1
Specifications ...................................................................................................................................................... 2
Interfaces.............................................................................................................................................................. 2
Working protocol ....................................................................................................................................................... 4
Communication timing.................................................................................................................................... 4
Data updating (one line) ................................................................................................................................. 6
Data update (multiple lines) .......................................................................................................................... 7
DIsplay mode ...................................................................................................................................................... 7
ALL clear Mode .................................................................................................................................................. 8
Demo codes ................................................................................................................................................................. 9
Raspberry Pi ........................................................................................................................................................ 9
Hardware connection.............................................................................................................................. 9
Software ................................................................................................................................................... 10
Arduino .............................................................................................................................................................. 11
Hardware connection........................................................................................................................... 11
Software ................................................................................................................................................... 12
STM32 ................................................................................................................................................................ 12
Hardware connection........................................................................................................................... 12
Software ................................................................................................................................................... 13
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WORKING PROTOCOL
Different with common monochrome LCD and SPI TFT LCD, 1.3inch Memory LCD has
features:
⚫ Driver circuit is etched to ITO of LCD instead of external driver IC
⚫ There is not internal RAM, works like a write only. So, image buffer is released by
master
◼ It requires 144x168/9 = 3024 bytes for a frame data. However, Arduino UNO
R3 has only 2k RAM, we integrate a SRAM (SPI interface) on PCB as data
buffer.
⚫ Data updates line by line. You need to re-save and update whole line of data even
just convert one pixel.
COMMUNICATION TIMING
The SPI timings of Memory LCD are similar
⚫ Set CS to High, and delay for certain time ad the begin of communicating
⚫ The first byte is display mode of Memory LCD
⚫ The second byte: the line address where data updated. Note that the line address
is begin from 1 instead of 0, LSB format:
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⚫ Following bytes are image data+16bit null data + delay time
⚫ Set CS pin to Low to finish communicating
DATA UPDATING (ONE LINE)
Update one line (M0 = “H”, M2 = “L”)
⚫ M0: Mode flag. Set for “H”. Data update mode (Memory internal data update)
◼ When “L”, display mode (maintain memory internal data).
⚫ M1: Frame inversion flag.
◼ When “H”, outputs VCOM=”H”, and when “L”, outputs VCOM=”L”.
◼ When EXTMODE=”H”, it can be “H” or “L”.
⚫ M2: All clear flag
◼ All Clear Mode to execute clear.
⚫ DUMMY DATA: Dummy data. It can be “H” or “L” (“L” is recommended.)
◼ Data writ period: Data is being stored in 1st latch block of binary driver on
panel
◼ Data transfer period: Data written in 1st latch is being transferred (written) to
pixel internal memory circuit.
⚫ M1: Frame inversion flag is enabled when EXTMODE=”L”
⚫ When SCS becomes “L”, M0 and M2 are cleared.
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DATA UPDATE (MULTIPLE LINES)
Updates arbitrary multiple lines data. (M0=”H”、M2＝”L”)
Almost same as one-line mode. The only difference is that: during data transferring
period:
⚫ Data transfer period:
◼ For example, during GL2nd line data transfer period, GL 2nd line address is
latched and GL1st line data is transferred from 1st latch to pixel internal
memory circuit at the same time.
DISPLAY MODE
Maintains memory internal data (maintains current display). (M0=”L”、M2＝”L”)
M0: Mode flag. Set for “H”. Data update mode (Memory internal data update)
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ALL CLEAR MODE
Clears memory internal data and writes white. (M0=”L”、M2＝”H”)
M2: All clear flag. Set it “H”
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DEMO CODES
RASPBERRY PI
HARDWARE CONNECTION
PIN
SYMBOL
Raspberry Pi (BCM)
1
VCC
3.3V
2
GND
GND
3
MISO
N.C.
4
MOSI
10 (MOSI)
5
SCLK
11(SCLK)
6
LCD_CS
23
7
RAM_CS
3.3V
8
DISP
24
9
EIN
25
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SOFTWARE
1. Enable SPI interface
a) Method 1: modify config.txt file, uncomment line dtparam=spi=on
Run command: sudo nano /boot/config.txt to open the file and modify
b) Method 2: configure it in raspi-config page.
Run command: sudo raspi-config to open the configuration page
Click Interfacing Options->SPI->Yes
2. Install bcm2835 libraries:
a) Download libraries from: http://www.airspayce.com/mikem/bcm2835/
b) Install it
1. tar zxvf bcm2835-x.xx.tar.gz
2. cd bcm2835-x.xx
3. ./configure
4. make
5. sudo make check
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6. sudo make install
3. Download demo code from github and run
1. git clone https://github.com/waveshare/MemoryLCD.git
2. cd MemoryLCD/
3. make
4. sudo ./mem_lcd
demo.h, demo.c: example codes
MemoryLCD.h, MemoryLCD.c: driver codes of LCD
pic.c: picture data
ugui*.*: open gui libraries uGUI
ARDUINO
HARDWARE CONNECTION
PIN
SYMBOL
Arduino
1
VCC
5V
2
GND
GND
3
MISO
D12
4
MOSI
D11
5
SCLK
D13
6
LCD_CS
D7
7
RAM_CS
D9
8
DISP
D8 9 EIN
D6
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【Note】There are many version of Arduino board. The board described herein is
Arduino UNO R3 and its compatible board. The operating voltage of Arduino UNO R3
is 5V, so, Vcc is connected to 5V (above table). If the board you use is 3.3V working
voltage, you need to change the Vcc to 3.3V
SOFTWARE
1. Make sure you have installed newest Arduino IDE in your PC.
2. Download demo code from wiki.
3. Copy folder Memory-LCD to …\Arduino\libraries
4. Open MonoDemo.ino, compile and download it to your Arduino board/
STM32
HARDWARE CONNECTION
PIN
SYMBOL
STM32
1
VCC
3.3V
2
GND
GND
3
MISO
N.C.
4
MOSI
PA7
5
SCLK
PA5
6
LCD_CS
PA8
7
RAM_CS
3.3V
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8
DISP
PA9
9
EIN
PC7
【Note】The demo code is based on STM32F429IGTx
SOFTWARE
1. Make sure you have installed Keil-IDE in your PC
2. Download demo code from wiki
3. Open STM32 project, compile and download to your STM32 board
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