240×160×2.9 SPI
1/8 VGA Cholesteric Display Module
TM
with SPI -Compatible Interface
Display Module:
•
240 Columns × 160 Rows
•
Active Frame: 2 Rows and 2 Columns
•
100 dpi (pixels per inch)
•
Approximate Size: 91 x 59 x 12 mm
•
Four Standard Colors
•
Integrated LCD Bias Supply
Product Features
•
•
•
•
•
•
•
•
“No Power” Image Retention
3.3V Logic Supply
3.0V – 9.0V Power Supply
Viewing Cone Comparable to Paper
Low Profile Modular Design
Available with Optional Bezel
10 μA Sleep Current
Full or Partial Screen Update Ability
Embedded Controller:
•
Serial Peripheral Interface (SPI) Compatible
•
250 kbps Image Download
•
32 KB of Image Memory
Typical Applications
•
•
•
Battery Powered Portable Devices
Machine Interface
Inventory Tracking Displays
•
•
•
Instrumentation Displays
Remote Control Display Applications
Point of Sale Displays
330.673.8784
330.673.4408
sales@kentdisplays.com
www.kentdisplays.com
Kent Displays, Inc.
343 Portage Boulevard
Kent, OH 44240 USA
Telephone:
Fax:
Email:
Website:
SPI
TM
is a trademark of Motorola Inc.
25075h 4/5/2010 © 2005-2010, Kent Displays, Inc.
240×160×2.9 SPI
Contents
1
2
3
Overview ...............................................................................................................................................................1
Block Diagram ......................................................................................................................................................1
Electrical Interface ...............................................................................................................................................1
3.1
Header ...........................................................................................................................................................1
3.2
Pin Summary..................................................................................................................................................2
3.3
Pin Functions .................................................................................................................................................2
3.3.1
Logic Interface ........................................................................................................................................2
3.3.2
Power Supply .........................................................................................................................................2
Operating Principles ............................................................................................................................................3
4.1
Bistability ........................................................................................................................................................3
4.2
Serial Interface ...............................................................................................................................................3
4.3
Power On and Reset ......................................................................................................................................5
4.4
Electronic Erase (Pressure Point Removal) ...................................................................................................5
4.5
Active Frame ..................................................................................................................................................5
4.6
Image Data.....................................................................................................................................................6
Specifications .......................................................................................................................................................7
5.1
General ..........................................................................................................................................................7
5.2
Electrical.........................................................................................................................................................7
5.2.1
Update Cycle Power Profiles ..................................................................................................................8
Update Cycle Temperature Performance ...............................................................................................9
5.2.2
5.3
Optical .......................................................................................................................................................... 10
5.4
Mechanical ................................................................................................................................................... 11
5.5
Timing .......................................................................................................................................................... 12
Instruction Set .................................................................................................................................................... 13
6.1
Overview ...................................................................................................................................................... 13
6.2
Memory Access Commands ........................................................................................................................ 13
6.2.1
WRITE.................................................................................................................................................. 13
6.2.2
FILL ...................................................................................................................................................... 14
6.2.3
READ ................................................................................................................................................... 14
6.2.4
CLEAR_BITS ....................................................................................................................................... 14
6.2.5
SET_BITS ............................................................................................................................................ 15
6.2.6
XOR_BITS ........................................................................................................................................... 15
6.3
Display Update Commands.......................................................................................................................... 15
6.3.1
CLR_DISP_BRT................................................................................................................................... 15
6.3.2
CLR_DISP_BRT_IB ............................................................................................................................. 15
6.3.3
CLR_DISP_DRK .................................................................................................................................. 15
6.3.4
CLR_DISP_DRK_IB ............................................................................................................................. 16
6.3.5
CLR_SECT_BRT ................................................................................................................................. 16
6.3.6
CLR_SECT_BRT_IB ............................................................................................................................ 16
6.3.7
CLR_SECT_DRK ................................................................................................................................. 16
6.3.8
CLR_SECT_DRK_IB............................................................................................................................ 17
6.3.9
DISP_FULLSCRN ................................................................................................................................ 17
6.3.10
DISP_PARTSCRN ............................................................................................................................... 17
6.4
System Control Commands ......................................................................................................................... 17
6.4.1
SLEEP.................................................................................................................................................. 17
RESET ................................................................................................................................................. 18
6.4.2
GET_FW_VERSION ............................................................................................................................ 18
6.4.3
6.4.4
SET_CONTRAST................................................................................................................................. 18
6.4.5
ELEC_ERASE ...................................................................................................................................... 19
Optional Heater .................................................................................................................................................. 19
HEATER_DISABLE ............................................................................................................................................. 20
HEATER_ENABLE .............................................................................................................................................. 20
HEATER_SET_TEMP .......................................................................................................................................... 20
Optional Front-Light .......................................................................................................................................... 21
Ordering Information ......................................................................................................................................... 22
4
5
6
7
8
9
25075h 4/5/2010 © 2005-2010, Kent Displays, Inc.
i
240×160×2.9 SPI
1 Overview
The 240x160 (1/8 VGA) ChLCD is a general-purpose graphic display module ideally suited for battery
powered portable devices and display applications that require superior optical performance including wide
viewing angle and sunlight readability. The display is a reflective cholesteric liquid crystal display (ChLCD)
that takes full advantage of the technology’s unique “No Power” image retention attribute. The embedded
display controller generates the unique ChLCD drive waveforms and provides automatic temperature
compensation. The SPI-compatible interface to the embedded controller simplifies system integration using a
minimal number of I/O resources and controls all display operations, from downloading image data to
triggering display updates. Bistable, sunlight readable, and easy to integrate, the 240x160 (1/8 VGA) is truly a
unique LCD display solution.
2 Block Diagram
3 Electrical Interface
3.1 Header
Electrical connection to the display module is made through the 16-contacts located at J1 (see section 5.4).
Connection options include a 1mm pitch ZIF flat flex connector (FFC – with top or bottom contacts) soldered to
the printed circuit board at J1, or a 50mm flat flexible cable soldered at J1 (with the cable contacts at the
opposite end facing up – toward the component side of the display module, or down – toward the viewing side
of the display module). Custom cable lengths are available upon request. Minimum quantities may apply for
custom configurations.
25075h 4/5/2010 © 2005-2010, Kent Displays, Inc.
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240×160×2.9 SPI
3.2 Pin Summary
Name
RESET
¯¯¯¯¯¯
BUSY
V
SS
SCK
SO
SI
CS
¯¯
V
CC
V
PWR
NC
Number
1
2
3,8,12,14
4
5
6
7
9
10,11,13
15,16
Type
Input
Output
Supply
Input
Output
Input
Input
Supply
Supply
--
Description
Reset (Optional Use).
Display Busy Status Indicator (Optional Use).
Ground.
Serial Data Clock.
Serial Data Output.
Serial Data Input.
Chip Select.
Logic Supply (3.3V).
Power Supply (3.0V – 9.0V).
No Connection.
3.3 Pin Functions
3.3.1 Logic Interface
SERIAL INPUT (SI):
The SI pin is used to shift commands and image data into the display module. Input is
only accepted when the display is selected (CS is low).
¯¯
SERIAL OUTPUT (SO):
The SO pin is used to shift data out of the display module. This pin is in a high-
impedance state when the display is not selected (CS is high).
¯¯
SERIAL CLOCK (SCK):
The SCK pin is used to clock data in and out of the display module. Input data is
latched from SI on the falling edge of SCK and new data is output on SO on the rising edge of SCK.
CHIP SELECT (CS):
The display module is selected when CS is low. A high-to-low transition on CS signifies
¯¯
¯¯
¯¯
the start of a new command packet. A low-to-high transition on CS is required to end the commanded
¯¯
operation.
RESET (RESET
A low level on the RESET pin terminates any operation in progress and holds the controller
¯¯¯¯¯¯):
¯¯¯¯¯¯
in the reset state. The reset sequence executes when this pin is released to the high state. The display
module enters the sleep mode upon termination of the reset sequence. There is no restriction on the RESET
¯¯¯¯¯¯
pin when powering on the display module. The RESET pin is internally pulled high, so this pin may be left
¯¯¯¯¯¯
unconnected.
BUSY (BUSY):
The BUSY pin is high while the display module is processing a command and also during
execution of the reset sequence. The BUSY pin must be low before the display may be selected (CS set low).
¯¯
¯¯
After receiving a command packet, the display module requires CS to return high before the operation can
complete and BUSY returns low. The display module is immediately ready for a new command packet when
BUSY returns low. Module status may also be polled using the serial interface, which makes use of this pin
optional.
3.3.2 Power Supply
LOGIC SUPPLY (V
CC
):
The V
CC
pin provides regulated 3.3V power to the display module control logic,
memory, and drivers.
POWER SUPPLY (V
PWR
):
The V
PWR
pin provides DC power to the bias supply used to drive the ChLCD. For
maximum efficiency, this supply may be unregulated. This pin draws zero current in sleep mode.
GROUND (V
SS
):
The V
SS
pin provides the return path for both V
CC
and V
PWR
.
25075h 4/5/2010 © 2005-2010, Kent Displays, Inc.
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