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RCM1990U-A
Liquid crystal displays
16x16 dots large-sized liquid crystal display unit
RCM1990U-A
Thanks to the high contrast and wide viewing angle of the RCM1990U-A, which is provided by its unique design technology, this module brings forth new applications in brand new LCD fields. ROHM large-sized LCD units are perfect displays for information or sign boards. As a media for informational display, large-sized LCD units must possess high visibility, wide viewing angles, and other such superior qualities. ROHM large-sized LCDs boast an excellent track record and possess guaranteed functionality for assured satisfaction in a variety of situations.
Applications Public displays such as airport displays, train station displays, information boards, and billboards.
Features 1) Wide viewing angle, high contrast, and fast response. 2) Compact and light weight for easy assembly. 3) Low power consumption.
External dimensions (Unit : mm)
1.0Max. 0.3Max. 2.5150.30
56.000.30 54.00Min. 50.970.30
1.100.10
1.100.10 2.650.30
2.00Max.
23.75Min. 20.75Min. 2.00Max. 2.500.30
54.00Min. 4.000.30 (8.00) (64.70)
61.000.30
57.500.30 36.75Min. 33.75Min.
(3.50)
(R3.20)
35.000.50 27.000.30 (15.00)
(40.5)
(4.00)
8 CN 2
1
8 CN 1
1
23.000.30 46.000.50
C2.0
1.000.30
2.700.50
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RCM1990U-A
Liquid crystal displays
Block diagram
COM.2
LCD
COM Generator circuit
COM.1
64 output driver IC
FLM VO VDD M CL1 CL2 DO GND OUTPUT
64 output driver IC
FLM VO VDD M CL1 CL2 DI GND INPUT
Pin functions Upper board Input (CN3)
Pin No. 1 2 3 4 5 6 7 8
Symbol FLM VO VDD M IN/OUT IN - - IN IN IN IN - Frame start signal Liquid crystal drive power supply 5 volts AC conversion signal for liquid crystal drive output Data latch signal, displays at rise / fall edge Shift register shift signal, reads data at rise / fall Display data signal (1 : On, 0 : Off) Ground potential Function
CL1 CL2
DI GND
Output (CN4)
Pin No. 1 2 3 4 5 6 7 8
Symbol FLM VO VDD M IN/OUT OUT - - OUT OUT OUT OUT - Frame start signal Liquid crystal drive power supply 5 Volts AC conversion signal Data latch signal Shift register shift signal Display data signal Ground potential Function
CL1 CL2
DI GND
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RCM1990U-A
Liquid crystal displays
Absolute maximum ratings (Ta=25C)
Parameter Power supply Logic circuit voltage LCD drive Symbol VDD VDD-VEE VIN Topr Tstg Limits -0.3 to +7.0 -0.3 to +7.0 -0.3 to VDD+0.3 0 to +50 -10 to +60 Unit V V V C C
Input voltage Operating temperature Storage temperature
Electrical characteristics (Ta=25C, VDD=5.0V0.25V)
Parameter High level input voltage Low level input voltage High level output voltage Low level output voltage Recommended LCD drive voltage Current dissipation
Symbol VIH VIL VOH VOL VLCD IDD Min. 3.5 - 4.6 - - - Typ. - - - - 5.0 1.0 Max. - 1.5 - 0.4 - 3.0 Unit V V V V V mA IOH=-0.4mA IOH=+0.4mA Ta=25C fCL=1MHz, fM=70Hz Conditions
AC characteristics (Ta=25C, VDD=5.0)
Parameter Shift frequency High level lock width Low level lock width Data setup time Clock setup time 1 Clock setup time 2 Data hold time FLM setup time FLM hold time Clock rise / fall time Output delay time AC conversion signal
Symbol fCL tCWH tCWL tSU tSL tLS tDH tFDS tFDH tct tpd fM Applicable terminal CL2 CL1, CL2 CL2 DI CL2 CL1 DI FLM FLM CL1, CL2 DO M Min. - 470 470 120 220 220 120 120 120 - - - Typ. - - - - - - - - - - - 70 Max. 1 - - - - - - - - 50 250 - Unit MHz ns ns ns ns ns ns ns ns ns ns Hz
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RCM1990U-A
Liquid crystal displays
Timing characteristics
CL2 VIH VIL tct VIH VIL tpd VOH VOL tCWH tct tSU tSL tCWL VIH
tDH
DI
DO
CL1 tct VIH
VIH VIL tCWH
tLS tct
FLM
tFDS
tFDH
Optical characteristics (Ta=25C)
No. Parameter Symbol Temperature (C) Min. 25 0 25 0 25 25 25 - - - - 0 90 20 Typ. 65 400 45 150 - - 40 Max. 130 800 100 300 60 270 - deg (Note 3) K3 =180 =10 ms (Note 2) Unit Note
Tr 1 Response speed Td Front-back 2 Viewing angle Right-left K
3
Contrast ratio
(Note 1) Drive waveform Static drive
VOP 1 / 2VOP 0 -1 / 2VOP -VOP 1/f
f = Frequency
(Note 2) Definition of response speed
ON IOFF
OFF T
0.91
I
ION Tr Td
0.11
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RCM1990U-A
Liquid crystal displays
Tr : Time for segment to darken 90% after selective waveform switches to non-selective waveform. =180, =10 Td : Time for segment to darken 90% after selective waveform switches to non-selective waveform. =180, =10
(Note 3) Definition of viewing angle (, )
Y( = 0) Z
Observer
X( = 90)
X'( = 270)
LCD Z' Y'( = 180)
(1) : Angle subtended by the Y-Y'-axis and the observer's position projected onto the XY-plane. (2) : Angle subtended by observer and the normal Z-Z'axis. (X-axis and Y-axis are positive) (3) Maximum viewing angle : The direction with highest contrast expressed at the time axis (refer to above table).
(Note 4) Definition of contrast ratio
Contrast ratio = Luminance during application n of non-selective waveform Luminance during application of selective waveform
Except, n=1 with positive display and n=-1 with negative display. < Measurement conditions > Drive conditions : As per specifications Viewing angle : =180, =10
(Note 5) Principles of optical measuring equipment
Specimen Illumination Photometry
Characteristic measuring device
LCD-5100
Constant temperature chamber
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RCM1990U-A
Liquid crystal displays
Data format (data and display mapping)
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12 D13 D14 D15 D16 D29 D30 D31 D32 D45 D46 D47 D48
D61 D62 D63 D64
D77 D78 D79 D80
D93 D94 D95 D96
D17
D18
D19
D20
D33
D34
D35
D36
D49 D50 D51 D52
D65 D66 D67 D68
D81 D82 D83 D84
D177 D193 D209 D225 D241 D178 D194 D210 D226 D242 D179 D195 D211 D227 D243 D180 D196 D212 D228 D244
D245
D246
D247
D248
D249
D250
D251
D252
D189 D205 D221 D237 D253 D190 D206 D222 D238 D254 D191 D207 D223 D239 D255 D192 D208 D224 D240 D256
FIRST DATA
D2 D4 D6 D8
COM.2 DATA
D250 D252 D254 D256
D1
D3
D5
D7
COM.1 DATA
D249 D251 D253 D255
LAST DATA
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RCM1990U-A
Liquid crystal displays
Timing chart
fM
M
FLM
CL1
fCL
CL1
CL2
DATA COM.2 DATA CL2 COM.1 DATA
DATA
D2 D4 D6
No.1 panel
D285 D286 D287 D288 D2 D4 D6
No.2 panel COM.2 DATA
D285 D286 D287 D288 D2 D4 D6
No.n panel
D285 D286 D287 D288 D1 D3 D5
COM.1 DATA
CL1
SEG.
(ON / ON)
SEG.
(ON / OFF)
SEG
(OFF / OFF)
COM.1
COM.2
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RCM1990U-A
Liquid crystal displays
Operation notes (1) Attention points in handling * Protect the module from strong shocks as they can cause damage or defective operation. * The polarizing plate on the surface of the module is soft and can easily be scratched. Wipe away dirt and dust using an
alcohol-based cleanser.
* If the liquid crystal panel is damaged and liquid crystal contacts your clothing or body, wash immediately with soap and water. * If the module is to be used for long periods subjected to direct sunlight, employ a filter to block the ultraviolet rays. * Do not store the module in areas of high temperature or high humidity. Do not store the module in locations exposed to direct
sunlight or fluorescent light.
(2) Precautions during operation * Do not connect or disconnect the module while the power supply is turned on. * Input the input signal after the module power supply is turned on. When turning it off, turn off the input signal first. Otherwise the
IC may be damaged by the latchup phenomenon.
(3) Precautions during installation * Be careful to avoid damage from static electricity. A CMOS-IC is used in the modules circuitry that can be easily damaged by static electricity. * Do not remove the liquid crystal panel from the unit. * Do not touch the back side of the liquid crystal panel. (4) Precautions during unit assembly * In order to protect the polarizing plate from dirt or scratches, it is recommended to use a protective cover on the front surface.
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Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.1

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