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Introduction of JDI MIP reflective‐type color LCD
Application Note
Introduction JDI releases a series of MIP (memory‐in‐pixel) reflective‐type color LCDs which realize high reflectance performance with ultra‐low power consumption. In following pages this application note will explain its design concept, optical enhancement feature and command examples.
April, 2016
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Connection Suggestion To keep tolerance for signal threshold, please use same power rail voltage for both output device and LCD input (each end of signals). In case you need higher SPI transfer rate, set the power rail voltage higher for both output and input. Below are examples which use CPU as a controller: Typical connection
Use same power source to drive CPU and LCD so that signal operations will be within same voltage range.
Figure 3. Typical connection
CPU under 1.5V / LCD 3V
For CPU operated in low voltage for lower power consumption, a dual power buffer of CMOS output can bridge the CPU and LCD.
Figure 4. Connection while CPU under 1.5V / LCD 3V
CPU LCD
2.7V ~ 3.3V
CPU LCD
3V 1.5V
5
VCOM frequency In order to avoid DC bias occurs in MIP LCD while displaying still image for a long time, the voltage (VCOM) of liquid crystal must invert continuously. There are two options to set VCOM driving mode, details listed below: By software (via command): For application like watch or timer, in which signals
updates regularly, end user can send toggle VCOM command every time data changes. Keeping VCOM duty (H or L) symmetrical is effective to prevent DC bias.
Figure 5. EXTMODE: L mode
By hardware (via signal line): Independent clock device such as RTC can be used to
keep controller sleeping or totally off.
Figure 6. EXTMODE: H mode
Operating frequency is the most critical factor to total power consumption because there are capacitive load in each liquid crystal, the higher the frequency is, the better optical performance you get. However, flicker may be visible if frequency is too low, such as under 1Hz. It is recommended to use higher frequency rate (around 60Hz) while lighting up with backlight unit since the flicker phenomenon is more sensitive.
LCD
VCOM
CPU
Interval sleep
EXTMODE=L
SPI
RTC
LCD
VCOM
CPU
SPI OFF
EXTMODE=H
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LCD commands There are several kinds of modes (commands) to write screen data and command structure as listed below: SINGLE LINE UPDATE Any single line can be updated individually as a minimum unit. Below is the command example if customer would like to update 1st line of panel, in 3BIT‐DATA MODE. For details, please refer to specification.
Mode selection (6bit) Gate line address (10bit) Color Voltage Data (nx3 bit) Data Trailer (16bit)
M0 M1 M2 M3 M4 M5 AG9 AG8 … AG1 AG0 D1R D1G D1B … DnG DnB Dummy1 … Dummy16
H L/H L L L ‐ 0 0 … 0 1 H/L H/L H/L H/L H/L H/L ‐ … ‐
*n represents horizontal resolution. MULTIPLE LINES UPDATE Any continuous lines can be written without re‐writing whole screen data, ex. 149th ~153rd lines. NO‐UPDATE Make both M0 and M2 high or low to maintain current screen data with VCOM inversion. DISPLAY BLINKING COLOR / DISPLAY COLOR INVERSION If the application unit would like to attract end users’ attention by blinking/inversion color command is recommended, such as application for special alarm or information signage.
Power consumption Another outstanding feature of MIP reflective‐type color LCD is its low power consumption ability while displaying still image and even writing mode. For panel displaying static image, the power consumption of 1.28” LCD is around 2µW. If the screen data changes every second, the power consumption is 10µW. If the screen data updates 10 times per second (10fps, frame per second), the power consumption is 90µW.
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