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PRODUCT INFORMATION
ISSUED DATE : 2011-08-02
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SAMSUNG TFT-LCD PRODUCT INFORMATION
TFT-
MODEL : LTM185AT05
on
pt
c e
o n
V C
r A
Fo Note : This is Product Information is subject to change after 3 months of issuing date.
Application Engineering Group
LCD Division, Samsung Electronics Co . , LTD.
MODEL LTM185AT05 Page 1/29
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PRODUCT INFORMATION
Contents
General Description ---------------------------------------------------------------------------------- (3)
1. Absolute Maximum Ratings -------------------------------------------------------------------- (4)
2. Optical Characteristics ---------------------------------------------------------------------------- (6)
ly
3. Electrical Characteristics ----------------------------------------------------------------------- (11)
3.1 TFT LCD Module
n
3.2 Back Light Unit
t o -----------
4. Block Diagram ------------------------------------------------------------------------------------- (15)
p
4 1 TFT LCD Module
4.1
4.2 Back Light Unit
c e
-------------
5. Input Terminal Pin Assignment ---------------------------------------------------------------- (16)
5.1 Input Signal & Power
5.2 LVDS Interface
o n
C
5.3 Back Light Unit
V
5.4 Input Signals, Basic Display Co
asic splay Colors and Gray Scale of Each Color
A
6. Interface Timing ---------
----------------------------------------------------------------------------------- (21)
r
6.1 Timing Parameters (
g (DE only mode)
y )
o
6.2 Timing Diagram of interface Signal (DE only mode)
2 Tim Diagrams
Po ON
6.3 Power ON/OFF Sequence
F
.4
6.4 VDD Power Dip Condition
7. Outline Dimension -------------------------------------------------------------------------------- (25)
8. General Precaution ------------------------------------------------------------------------------- (27)
8.1 Handling
8.2 Storage
8.3 Operation
8.4 Operation Condition Guide
8.5 Others
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General Description PRODUCT INFORMATION
Description
LTM185AT05 product is a color active matrix liquid crystal display (LCD) that uses
amorphous silicon TFT (Thin Film Transistor) as switching components This model is
components.
composed of a TFT LCD panel, a driver circuit and a back light unit. The resolution of a
18.5" is 1366 X 768 and this model can display up to 16.7 millions colors.
Features
High contrast ratio, high aperture structure
TN (Twisted Nematic) mode
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Wide Viewing Angle
HD (1366 x 768 pixels) resolution
n
Low power consumption
White LED Edge slim Backlight (1-side)
o
DE (Data Enable) only mode
t
LVDS (Low Voltage Differential Signaling) interface (1pixel/clock)
p
CCompact Si D i
t Size Design
RoHS compliance
e
TCO5.0 compliance
c
( Except for 2.2 response time; this product does not have over driving function.
ot drivin
n
It is recommended to support in system level )
Halogen Free
Applications
C
Workstation & desktop monitors
op nito o
V
Display terminals for AV application products
als plication
Monitors for industrial m
A
or machine
* If the module is used to other applications besides the above, please contact SEC
dule
r
in advance
advance.
e.
e
o
General Information
In ma
F Items
Pixel Pitch
Active Display Area
Surface Treatment
Specification
0.300(H) x 0.300(W)
409.8(H) x 230 ( )
09 8( ) 230.4(V)
Haze 25%, Hard-coating(3H)
Unit
mm
mm
Note
Display Colors 16.7M (Hi-FRC ) colors
Number of Pixels 1,366 x 768 pixel
Pixel Arrangement RGB vertical stripe
Display Mode Normally White
Luminance of White 250(Typ.) cd/
MODEL LTM185AT05 Page 3/29
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PRODUCT INFORMATION
Mechanical Information
Item Min.
Min T p
Typ. Max.
Ma Unit Note
Horizontal (H) 429.87 430.37 430.87 mm
Module -
Vertical (V) 254.1 254.6 255.1 mm
size
Depth (D) - - 10.7 mm .
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Weight - - 1 00
1500 g LCD module only
C
n
Note (1) Mechanical tolerance is 0.5mm unless there is a special comment.
t o
e p
1. Absolute Maximum Ratings
n c
C o
If the condition exceeds maximum ratings, it can cause malfunction or unrecoverable
damage to the device.
mum ca
V
em
Item Symbol Min. Max. Unit Note
A
er Volta
Power Supply Voltage VDD GND-0.5 5.5 V (1)
r
Storage tempe
age temperature TSTG -20 60 (2)
o
Center o glass surface temperature
of ss
F
TOPR 0 50 (2)
(Operation)
Shock ( non - operating ) Snop - 50 G (3)
Vibration ( non - operating ) Vnop - 1.5 G (4)
Note (1) Ta= 25 2 C
MODEL LTM185AT05 Page 4/29
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PRODUCT INFORMATION
(2) Temperature and relative humidity range are shown in the figure below.
a. 90 % RH Max. (Ta 39 C)
b.
b Maximum wet-bulb temperature at 39 C or less. (Ta 39 C)
less
c. No condensation
(3) 11ms, sine wave, one time for X, Y, Z axis
(4) 10-300 Hz, Sweep rate 10min, 30min for X,Y,Z axis
(5) At vibration and shock test, the fixture which holds the module to be tested has to be
hard and rigid enough so that the module would not be twisted or bent by the fixture.
(39,90)
n ly
(50,50.4)
(60,27.7t
(60,27.7)
(60,27.
o
n
(-25,5)
C o
Fig. Temperature and Relative humidity range
. T perature
A V
o r
F
MODEL LTM185AT05 Page 5/29
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2. Optical Characteristics PRODUCT INFORMATION
The optical characteristics should be measured in a dark room or equivalent.
Measuring equipment : SR 3 RD 80S (TOPCON), EZ-Contrast (Eldim)
SR-3, RD-80S (TOPCON) EZ Contrast
(Ta = 25 2 C, VDD=5V, fv= 60Hz, fDCLK=72.33MHz, IF = 360mA
Item Symbol Condition Min. Typ. Max. Unit Note
Contrast Ratio (3)
C/R 600 1000 -
ly
(Center of screen) SR-3
Response (5)
n
On/Off Tr+ Tf - 5 10 msec
Time 0S
RD-850S
o
Luminance of White (6)
t
YL 200 250 - cd/m2
(Center of screen) SR-3
p
Rx 0.639
e
Red
Ry 0.340
Green
Gx
nc 0.324
o
Color Gy 0.622
Chromaticity -0 030
-0.030
0
0.0 +0.030
+0 030
C
(CIE 1931) Bx 0.155
Blue
B
By 0.042
V
W
Wx 0.313
A
W
White Normal
Wy 0.329
L,R=0
r
(7),(8)
U,D=0
0 SR-3
SR 3
Ru' 0.441
o
Red
R
Viewing
F
Rv' 0.527
Angle
Gu' 0.132
Color Green
Chromaticity Gv' 0.570
- -
(CIE 1976) Bu' 0.194
Blue
Bv' 0.118
Wu' 0.198
White
Wv' 0.468
C.G.L
CGL White
Whi u'v''
' - - 0 02
0.02 (9)
* C.G.L : Color Grayscale Linearity (continue to the next page)
MODEL LTM185AT05 Page 6/29
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PRODUCT INFORMATION
Item Symbol Condition Min. Typ. Max. Unit Note
Color Gamut - - 72 - %
Color Temperature - - 6500 - K
L 70 80 -
Hor.
70 80 - (8)
Viewing R
CR10 Degrees EZ-
Angle 70 80 -
U Contrast
Ver.
ly
D 70 80 -
Brightness Uniformity (4)
n
Buni - - 25 %
(9 Points) SR-3
t o
p
Note (1) Test Equipment Setup
e
The measurement should be executed in a stable, windless and dark roo between
room
ure
30min after lighting the back light at the given temperature for stabilization
c
of the back light. This should be measured in the center of screen.
r
n
LED current : 360mA Environment condition : Ta = 25
onment 2 C
C o
V
Photo
Photod
Photodetector
t
A
Photodetector Field
r
SR-3
R-3 2 Field
F o SR-3 : 50
RD-80S : 50
TFT - LCD Module
LCD Panel
The center of the screen
MODEL LTM185AT05 Page 7/29
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PRODUCT INFORMATION
Note (2) Definition of test point
137 683 1229
Active Area
9 8 7 77
6 5 4 384
ly
3 2 1
691
: Test Point
o n
Note (3) Definition of Contrast Ratio (C/R)
pt
e
: Ratio of gray max (Gmax) & gray min (Gmin) at the center poin
enter point f th
of the panel
CR
G max
G min
n c
m
C
ce
ce
o whi
Gmax : Luminance with all pixels white
Gmin : Luminance with all pixels black
A V
o r
F
Note (4) Definition of 9 points brightness uniformity
G m a x
C R
G m in
Bmax : Maximum brightness
Bmin : Minimum brightness
MODEL LTM185AT05 Page 8/29
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PRODUCT INFORMATION
Note (5) Definition of Response time
a.
a On/Off response time : Sum of Tr Tf
Tr,
Display Data White(TFT off) Black(TFT on) White(TFT off)
Optical Instruments 100%
Response
ly
90%
10%
on
t
0%
e p
c
Note (6) Definition of Luminance of White : Luminance of white at center point
ite p
o n
Note (7) Definition of Color Chromaticity (CIE 1931 CIE1976)
CIE 1931, CIE
C
Color coordinate of Red, Green, Blue & White at center point
A V
Note (8) Definition of Viewin Angle
nition Viewing
r
: Viewing angle ra
wing ang range (CR 10)
10)
F o
MODEL LTM185AT05 Page 9/29
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PRODUCT INFORMATION
Note (9) Color Grayscale Linearity
a.
a Test image : 100% full white pattern with a test pattern as below
b. Test pattern : Squares, 40mm by 40mm in size, filled with 255, 225, 195, 165, 135 and
105 grays steps should be arranged at the center of the screen.
n ly
t o
e p
n c
c. Test method
C o
V
-1st gray step : mov a square o 255 gray level should be moved into the center of the
ep move quare of
A
screen and measure luminance and u' and v' coordinates.
n
r
Next
- N t gray step : M
t i t th
Move a 225 gray square into the center and measure both
t d b th
o
nc
luminance and coordinates, too.
F
d. Te evaluation
Test
'u' v' = (u' A - u' B) 2 + (v' A - v' B) 2
'u v (u u (v v
Where A, B : 2 gray levels found to have the largest color differences between them
i.e. get the largest u' and v' of each 6 pair of u' and v' and calculate the u'v'.
MODEL LTM185AT05 Page 10/29
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3. Electrical Characteristics PRODUCT INFORMATION
3.1 TFT LCD Module
The connector for display data & timing signal should be connected.
T = 25 C
Ta
Item Symbol Min. Typ. Max. Unit Note
Voltage of Power Supply VDD 4.5 5.0 5.5 V (1)
Differential Input g
High - - +50 mV ( )
(2)
ly
Voltage for LVDS
Receiver Threshold Low -50 - - mV
n
LVDS skew tSKEW - 270 270 (3)
o
LVDS
t
Input Differential input
|VID| 100 600 mV
V (4)
Characteri voltage
p
stics
e
Input voltage range
VIN 0.7 1.7 V (4)
(single-ended)
Common mode
voltage
VCM
nc1.0 1.2 1.4 V (4)
Current of
Power
(a) Black
(b) White
hit
C IDD o -
-
500
500
-
-
mA
mA (5),(6)
V
D
Supply
(c) Dot - 700 1,000 mA
A
c
Vsync Frequency fV 47 60 75 Hz
r
Hsync Frequency
H c Freque fH 37.13 47.40 59.25 kHz
Fo Main Frequency
Rush Current
fDCLK
IRUSH
56.66
-
72.33
-
90.42
3.0
MHz
A (7)
Note (1) The ripple voltage should be controlled under 10% of VDD.
MODEL LTM185AT05 Page 11/29
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PRODUCT INFORMATION
(2) Differential receiver voltage definitions and propagation delay and transition time test circuit
a. All input pulses have frequency = 10MHz, tR or tF=1ns
b. CL includes all probe and fixture capacitance
Note a.
ly
Note b.
o
(3) LVDS Receiver DC parameters are measured under static and steady conditions
ons
n
t
which may not be reflective of its performance in the end application.
p
T
LVDS Clk VDIFF= 0V
c e VDIFF= 0V Differential
LVDS Data
o n Differential
C
RX +/-
tSKEW
V
where tskew : skew between LVDS clock & LVDS data,
be n
A
t
T : 1 period time of LVDS clock
cf) (-/+) of 270
270psec means LVDS data goes before or after LVDS clock.
o r (4) Def
) Definition o VID and VCM using single-end signals
n of
F
VDD
VCM=1.4V |VID| = 100mV VCM=1 4V
=1.4V |VID| = 600mV
VCM=1.2V
VCM=1.0 |VID| = 100mV VCM=1.0 |VID| = 600mV
VSS
VCM range with Min |VID| VCM range with Max |VID|
MODEL LTM185AT05 Page 12/29
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PRODUCT INFORMATION
(5) fV=60Hz, fDCLK = 72.33MHz, VDD = 5.0V, DC Current.
(6) Power dissipation check pattern (LCD Module only)
a) White Pattern b) Black Pattern c) Dot Pattern
n ly
t o
e p
(7) Measurement Condition
n c
100%
90%
C o VDD
A
10%
GND
V
o r
F
TRUSH=470
Rush Current IRUSH can be measured when TRUSH. is 470 .
MODEL LTM185AT05 Page 13/29
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PRODUCT INFORMATION
3.2 Back Light Unit
3.2.1 The characteristics of LED bar
The back light unit is composed of WLED.
Ta=25 2C
Item Symbol Min. Typ. Max. Unit Note
(1)
LED Forward Current IF - 360 400 mA
ly
/ch
/ h
LED Array Voltage VP - 22.40 24.36 V -
n
Operating Life Time Hr 30,000 - Hour (2)
t o
Note (1) The above specification is not for the converter output, but for the LED bar.
rt D
p
The LED bar consists of 21 LED packages ; 3 parallel X 7 seri serial
e
(2) Life time (Hr) is defined as the time when brightness of a LED package itself
f packa
c
becomes 50% or less than its original value at the condition of Ta=
e Ta=25 2 C
and IF =360mA
o n
V C
r A
F o
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4. BLOCK DIAGRAM PRODUCT INFORMATION
4.1 TFT LCD Module
USI 2
Control signal Source Driver ICs
LVDS S1 S1366
pair #1 Control signal
RSDS(Tx)
LVDS (R
Column Driver Circuit
LVDS
p
pair #2
Rx)
ly
CN1
(30pin) TFT-LCD
(1366 x RGB x 768 pixels)
n
Timing Controller
o
+5.0V
VDD Power
Circuit
pt
c e
4.2
4 2 Back Light Unit
o n
C
Connector: Molex 104086-0410 or equivalent
0
(mating CNT : Molex 104085-0400, 104085-0
04 0400, 104085-0410)
A V
o r
F
LED bar
LED Return
LED Power
signal
LED Power
4-pin connector
LED Return
signal
MODEL LTM185AT05 Page 15/29
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PRODUCT INFORMATION
5. Input Terminal Pin Assignment
5.1. Input Signal & Power (Connector : UJU IS100-L30B-C23 or equivalent )
PIN NO SYMBOL FUNCTION
1 NC No Connection
2 CE * CE (For LCD internal use only. Do not connect)
3 CTL * CTL (For LCD internal use only. Do not connect)
4 GND Power Ground
5 RXIN0- Negative LVDS Differential Data Input ( )
g p (0)
ly
6 RXIN0+ Positive LVDS Differential Data Input (0)
7 GND Power Ground
n
8 RXIN1- Negative LVDS Differential Data Input (1)
o
9 RXIN1+ Positive LVDS Differential Data Input (1)
t
10 GND Power Ground
p
11 RXIN2- Negative LVDS Differential Data Input (2)
Inp
e
12 RXIN2+ tial (
Positive LVDS Differential Data Input (2)
c
13 GND wer
Power Ground
n
14 RXCLKIN- Negative LVDS Differential Clock Input (Clock)
o
15 RXCLKIN+ Positive LVDS Differ
tive Differential Clock Input (Clock)
C
16 GND Power Ground
17 RXIN3- Neg
Negative LVDS Differential Data Input (3)
V
18 RXIN3+
+ Positive LVDS Differential Data Input (3)
A
19 GND Power Ground
20 NC No Connection
r
21 NC No Connection
o
22 NC No Connection
F
23 GND Power Ground
24
2 GND Power Ground
25 GND Power Ground
26 VCC
27 VCC
28 VCC Power Supply : +5V
29 VCC
30 VCC
* If the system already uses the 1, 2pins, it should keep under GND level
The voltage applied to those pins should not exceed -200mV.
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PRODUCT INFORMATION
Note) Pin number starts from left side
PCB
Pin No. 1 Pin No. 30
n ly
#1
t o
#30
ep
#1
n c #30
C o
Fig. Connec
Connector diagram
A V
o r a. All GND pins should be connected together and also be connected to the
A
F
LCD's metal chassis.
C
b. All power input pins should be connected together.
c. All NC pins should be separated from other signal or power.
MODEL LTM185AT05 Page 17/29
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PRODUCT INFORMATION
5.2 Timing Diagrams of LVDS For Transmitting
LVDS Receiver : Integrated T-CON
g
n ly
V C
r A
F o
MODEL LTM185AT05 Page 18/29
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PRODUCT INFORMATION
5.3 Back Light Unit
LED Bar input connector : Molex 104086-0410 or equivalent
104086 0410
(mating CNT : Molex 104085-0400, 104085-0410)
Pin No. Pin description Description
1 Vcc LED power input
2 RTN1 Channel 1 LED return
ly
3 RTN2 Channel 2 LED return
n
4 RTN3 Channel 3 LED return
t o
e p
Note ) Pin number starts from Left side
n c
C
Rear view of panel
nel
o
A V
r
#4 #1
o
Con
Connector
F
Fig. Connector diagram
MODEL LTM185AT05 Page 19/29
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PRODUCT INFORMATION
5.4 Input Signals, Basic Display Colors and Gray Scale of Each Color
DATA SIGNAL
RED GREEN BLUE GRAY
DISPLAY
COLOR SCALE
(8bit)
G G G G G LEVEL
R0 R1 R2 R3 R4 R5 R6 R7 G0 G3 G6 B0 B1 B2 B3 B4 B5 B6 B7
1 2 4 5 7
BLACK 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -
BLUE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 -
GREEN 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 -
ly
CYAN 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 -
BASIC
COLOR RED 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -
n
MAGENT
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 -
A
o
YELLOW 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 -
t
WHITE 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 -
p
BLACK
C 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 R0
e
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 R1
0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 R2
c
DARK
GRAY
SCALE : : : : : : : : : : : : : : : : : : R3~
n
OF : : : : : : : : : : : : : : : : : : R252
RED
o
LIGHT 1 0 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 R253
0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 R254
C
RED 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 R255
BLACK 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 G0
V
0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 G1
A
DARK 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 G2
GRAY
r
SCALE : : : : : : : : : : : : : : : : : : G3~
OF : : : : : : : : : : : : : : : : : : G252
o
GREEN
LIGHT 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 0 0 0 0 0 0 0 0 G253
F
0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 G254
GREEN 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 G255
BLACK 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 B0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 B1
DARK 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 B2
GRAY
SCALE : : : : : : : : : : : : : : : : : : B3~
OF : : : : : : : : : : : : : : : : : : B252
BLUE
LIGHT 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 B253
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 B254
BLUE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 B255
Note (1) Definition of Gray :
Rn : Red Gray, Gn : Green Gray, Bn : Blue Gray (n = Gray level)
Input Signal : 0 = Low level voltage, 1 = High level voltage
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PRODUCT INFORMATION
6. Interface Timing
6.1 Timing Parameters ( DE only mode )
SIGNAL ITEM SYMBOL MIN. TYP. MAX. Unit NOTE
Clock 1/TC 56.66 72.33 90.42 MHz -
Hsync Frequency FH 37.13 47.4 59.25 KHz -
Vsync FV 47 60 75 Hz -
ly
Active
Display TVD 768 768 768 Lines -
n
Vertical Period
o
Display Term
Vertical
TVB 776 790 948 lines
ines -
t
Total
p
Active
e
Display THD 1366 1366 1366 Clocks -
Horizontal Period
c
Display Term
n
Horizontal
TH 1470 1526 18
1830 Clocks -
Total
effe
C o
Note (1) This product is DE only mode. The input of Hsync & Vsync signal does
n oper
inp
not have an effect on normal operation.
V
(2) Test Point : TTL control sign and CLK at LVDS Tx input terminal in system
int rol signal
A
(3) Internal Vcc = 5.
ernal 5.0V
r
(4) Best operation clock frequency is 72.33MHz(60Hz)
st operati c
t
o
(5) Clock f
ck frequency = Frame frequency x TV(Typ) x TH(Typ)
F
(6) Max, Min variation range is at main clock Typ value (72.33MHz).
MODEL LTM185AT05 Page 21/29
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PRODUCT INFORMATION
6.2 Timing diagrams of interface signal ( DE only mode )
TV
TVD TVB
DE
TH
n ly
o
THD
t
DE
DCLK
ep
c
TC
n
DATA
o
SIGNALS
V C
A
TC
r
TCH TCL
F o DCLK
TDS TDH
0.5
VCC
DISPLAY 0.5
DATA
VCC
TES
DE 0.5
VCC
MODEL LTM185AT05 Page 22/29
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PRODUCT INFORMATION
6.3 Power ON/OFF Sequence
To prevent a latch-up or DC operation of the LCD Module the power on/off sequence
Module,
should be as the diagram below.
ly
300 T110msec
0T250msec
n
0T350msec
1secT4
Back-Light
(Recommended)
o
500msecT5
n
100msecT6
C o
V
T1 : VDD rising time fr
Dr me from 10% to 90%
A
T2 : The ti
time from VDD to valid data at power ON.
r
T3 : The time from valid data off to VDD off at power Off.
tim
T4 : VDD off time for Windows restart
o
T5 : The time from valid data to B/L enable at power ON.
F
T6 : The time from valid data off to B/L disable at power Off.
The supply voltage of the external system for the Module input should be the same
as the definition of VDD.
Apply the LED voltage within the LCD operation range. When the back light turns on
before the LCD operation or the LCD turns off before the back light turns off,
the display may momentarily show abnormal screen.
In case of VDD = off level,