Datasheet RCM1990U-A Datasheet (ROHM)

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RCM1990U-A

Liquid crystal displays

16×16 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.

zApplica tions

Public displays such as airport displays, train station displays, information boards, and billboards.

zFeatures

1) Wide viewing angle, high contrast, and fast response.

2) Compact and light weight for easy assembly.

3) Low power consumption.

zExternal dimensions (Unit : mm)

1.10

±0.101.10±0.1056.00±0.301.0Max.

2.65±0.30

(40.5)(R3.20)

1.00±0.30 2.70±0.50

61.00±0.30

57.50±0.30(3.50)

36.75Min.35.00±0.50

23.75Min.

33.75Min.

(8.00)

4.00±0.3027.00±0.30

2.00Max.

20.75Min.

(15.00)

(4.00)

81 81

CN 2

±0.30

23.00

54.00Min.0.3Max.

50.97

±0.302.515±0.30

CN 1

46.00±0.50 C2.0

2.00Max.

2.50±0.30

54.00Min.
(64.70)

1/8

Liquid crystal displays

zBlock diagram

RCM1990U-A

zPin functions

Upper board

Input (CN3)

Pin No.

1
2
3
4
5
6
7
8

Output (CN4)

FLM

VO

DD

V

M
CL1
CL2

D

O

GND

OUTPUT

Symbol

FLM

VO
V

DD

M

CL1
CL2

DI

GND

IN/OUT

IN

−

−

IN
IN
IN
IN

−

64 output

driver IC

LCD

64 output

driver IC

COM.2

COM.1

COM

Generator circuit

Function
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

FLM
VO

DD

V
M
CL1
CL2
DI
GND

INPUT

Pin No.

Symbol

1
2
3
4
5
6
7
8

FLM

VO
V

M

CL1
CL2

DI

GND

IN/OUT

OUT

DD

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

2/8

Liquid crystal displays

zAbsolute maximum ratings (Ta=25°C)

RCM1990U-A

Parameter

Power supply

voltage

Logic circuit

LCD drive

Input voltage
Operating temperature
Storage temperature

Symbol

V

DD

VDD-V

V

IN

T

opr

T

stg

EE

zElectrical characteristics (Ta=25°C, V

Parameter
High level input voltage
Low level input voltage
High level output voltage
Low level output voltage
Recommended LCD drive voltage
Current dissipation

Symbol

IH

V

V

IL

V

OH

V

OL

V

LCD

I

DD

zAC characteristics (Ta=25°C, V

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

DD=5.0)

Limits

−0.3 to +7.0

−0.3 to +7.0

−0.3 to V

DD

+0.3

0 to +50

−10 to +60

DD=5.0V±0.25V)

Min.

3.5

−

4.6

−

−

−

Symbol

Applicable terminal

fCL

tCWH

CL1, CL2

tCWL

tSU
tSL
tLS

tDH
tFDS
tFDH

tct

CL1, CL2

tpd

fM

Typ.

CL2

CL2

DI
CL2
CL1

DI
FLM
FLM

DO

M

5.0

1.0

Unit

V
V
V

°C
°C

Max.

−

−

−

−

−

1.5

−

0.4

−

3.0

Min.

−

470
470
120
220
220
120
120
120

−

−

−

Unit

V
V
V
V
V

mA

Typ.

−

−

−

−

−

−

−

−

−

−

−

70

Conditions

IOH=−0.4mA

OH

=+0.4mA

I
Ta=25°C
f

CL

=1MHz, fM=70Hz

Max.

1

−

−

−

−

−

−

−

−

50

250

−

Unit

MHz

ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Hz

3/8

Liquid crystal displays

zTiming characteristics

V

IH

V

IL

CL2

t

ct

DI

DO

CL1

FLM

zOptical characteristics (Ta=25°C)

RCM1990U-A

V

t

FDH

IH

ct

t

CWL

t

CWH

V

IH

V

IL

t

pd

V

OH

V

OL

V

IH

t

ct

t

SU

V

IH

V

IL

t

ct

t

DH

t

SL

t

LS

t

CWH

t

FDS

t

No. Parameter

1

2

3

Response speed

Viewing angle

Contrast ratio

Front-back
Right-left

(Note 1) Drive waveform

Static drive

1 / f

1 / 2V

−1 / 2V

V

OP

OP

0

OP

OP

−V

(Note 2) Definition of response speed

OFFON

I

OFF

Symbol

Temperature (°C)

Tr

Td

θ

φ 90 −

K2040

f = Frequency

T

25

0

25

0
25
25

25

Min.65Typ.

−

400 800

−

45

−

150

−

0

−

Unit Note

Max.

130

ms (Note 2)

100
300

60

deg

270

−

(Note 3)
K≥3

φ=180°
θ=10°

I

0.91

T

I

ON

r

0.11

T

d

4/8

RCM1990U-A

Liquid crystal displays

Tr : Time for segment to darken 90% after selective waveform switches to non-selective waveform.

φ=180°, θ=10°

Td : Time for segment to darken 90% after selective waveform switches to non-selective waveform.

φ=180°, θ=10°

(Note 3) Definition of viewing angle (φ, θ)

Z

=

0°)

X(φ

Y(φ

=

90°)

θ

φ

Observer

X'(φ

=

270°)

LCD

Z'

Y'(φ

=

180°)

(1) φ : Angle subtended by the Y-Y’-axis and the observer’s position projected onto the XY-plane.
(2) θ : 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
<Definition>

Luminance during application

Contrast ratio =

of non-selective waveform

Luminance during application

of selective waveform

n

Except, n=1 with positive display and n=−1 with negative display.
< Measurement conditions >

Drive conditions : As per specifications
Viewing angle : φ=180°, θ=10°

(Note 5) Principles of optical measuring equipment

Characteristic
measuring
device

LCD-5100

Illumination

Specimen

Photometry

Constant temperature chamber

5/8

Liquid crystal displays

zData format (data and display mapping)

D1 D17 D33 D209 D225 D241

D2 D18 D34 D210 D226 D242

D3 D19 D35 D211 D227 D243

D4 D20 D36 D212 D228 D244

D5 D245

D6 D246

D7 D247

D8 D248

D9 D249

D10 D250

D11 D251

D12
D13 D29 D45
D14 D30 D46
D15 D31 D47
D16 D32 D48

D49
D50
D51
D52

D61
D62
D63
D64

D65
D66
D67
D68

D77
D78
D79
D80

D81
D82
D83
D84

D93
D94
D95
D96

D177
D178
D179
D180

D189
D190
D191
D192

D193
D194
D195
D196

D221 D237 D253

D205

D222 D238 D254

D206

D223 D239 D255

D207

D224 D240 D256

D208

RCM1990U-A

D252

FIRST DATA

D2 D4 D6 D8 D254 D256D250 D252

COM.2 DATA

D1 D3 D5 D7 D253 D255D249 D251

COM.1 DATA

LAST DATA

6/8

Liquid crystal displays

zTiming chart

M

FLM

CL1

f

CL

CL1

CL2

DATA

CL2

f

M

COM.2 DATA COM.1 DATA

RCM1990U-A

COM.1

COM.2

DATA

CL1

SEG.

(ON / ON)

SEG.

(ON / OFF)

SEG

(OFF / OFF)

D2 D4 D6 D2 D4 D6

D285 D286 D287 D288

No.2 panel

COM.2 DATA

D285 D286 D287 D288 D285 D286 D287 D288

D2 D4 D6

No.n panelNo.1 panel

D1 D3 D5

COM.1

DATA

7/8

RCM1990U-A

Liquid crystal displays

zOperation 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.

8/8

Appendix

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.

Notes

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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