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This specification is applied to the following TFT Liquid Crystal Display Module
with Back-light unit and LVDS (Low Voltage Differential Signaling) Interface.
Note:Inverter device for Back-light is not built in and so it needs to
The following items are measured on the conditions that this unit operation (TFT panel
and Back-light) and measuring systems are stable. (more than 30minites' operation)
The ambient light excluding The Back-light unit is nothing.
•Measuring equipment : TOPCON BM-7, Prichard 1980A, or equivalent
•Measuring point: Active area center
ItemSymbolMin.Typ.Max.UnitNote
Contrast RatioCR–150––1)
ResponseRisetr–50–
TimeFalltf–30–
Brightness (white)Bwh–150–
Red
Color of CIEy–0.56––
Green
Blue
White
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Temperature of LCD=25°C, VDD=3.3V, fV=60Hz, IL=6.0mA
ms2)
2
cd/m
x–0.58–
y–0.33–
x–0.30–
x–0.15–
y–0.14–
x–0.32–
y–0.33–
Hitachi Displays, Ltd.Sep. 18, 2007DPBCL0001618-1
DatePage
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f
Notes 1) Definition of Contrast Ratio (CR)
CR =
2) Definition of Response Time
Brightness when displaying White raster
Brightness when displaying Black raster
These Brightness is measured on the center of screen.
* Measurement in the darkroom.
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Optical Response
Relative
luminance
100
90
10
%
trt
0
Sh.
No.
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2)
Typical value is measured when displaying vertical 64 gray scale.
Maximum is measured when displaying Vertical-stripe (Black-Gray 7).
=65MHz, VDD=3.3V, DC Current.
CLK
DC Ampere Meter
V
DD
Hi
Lo
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Symbol
V
V
V
I
f
f
f
CLK
I
DD
DD
IH
IL
DD
V
H
V
V
Min.Item
3.0
––+100
-100
–
–
–
–
TFT/LCM
DD
SS
Typ.
3.3
–
300
60
48.5
65
Max.UnitNote
3.6
–
600
65
52.4
67
V
mV1)
mA
Hz
kHz
MHz
2), 3)
4)
4)
4)
Current capacity for V
3)
4) For LVDS Transmitter Input
power source should be larger than 2A.
DD
3.2 BACK-LIGHT UNITTa=25°C
ItemSymbolMin.Typ.Max.UnitNote
Lamp Current
Lamp Voltage
Frequency
I
L
V
L
f
L
Starting Lamp VoltageVsVrms
Notes 1) Higher IL cause the short life time of CFL.
2) DC current cause irregular fluorescence and the short life of CFL.
3) Lamp frequency may produce interference with Hsync frequency,
causing beat or flicker on the display. There fore lamp frequency
shall be as different as possible from Hsync frequency, to avoid interference.
4) Starting Lamp Voltage applied be more than Vs (Min).
5) Ta=10°C
6) Reducing Lamp current increases Lamp voltage and generally increases Lamp frequency.
So all the parameters of an inverter should be carefully designed so as not to
produce to much leakage current from high-voltage output of the inverter.
7) Must be high considering to the loss of the ballast capacitor in the inverter.
3.55.06.0mArms
––11mA0-peak
1), 2), 6)
–650–Vrms
50–70kHz3)
1100––4)
1400––4), 5), 7)
Sh.
No.
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