LITEMAX LF1203
Ultra brightness 12.1" LCD Display
Rev: 0.1
Date: July 4, 2001
LITEMAX Electronics Inc.
No.8, Lane 89, Sec. 3, Chung-yang Rd., Tucheng City, Taipei
County, Taiwan R.O.C.
Tel : 886-2-2267-6766
Fax: 886-2-2267-6779
Homepage: http://www.litemax.com.tw
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General Introduction
The LITEMAX model LF1203 is a 12.1" color TFT-LCD product. Its brightness is up to 800
cd/m². The LF1203 consists of TFT LCD panel module (SP1203), LCD controller board and
backlight inverter (LI2002).
By applying the LITEMAX backlight technical to the LF1203, the display quality can be
improved.
LCD Panel Module (SP1203)
1. Introduction
SP1203 is a 12.1", ultra brightness LCD panel module. This module consists of Sharp
LQ121S1DG11 TFT color LCD and a LITEMAX Ultra Brightness (UB) backlight mounted onto
the back of the LCD. The entire is about 24.5 mm thick and has the same footprint as the
original Sharp LQ121S1DG11 LCD.
The SP1203 panel module has a higher contrast, wide view-angle LCD and a wider operating
temperature range. In the normal mode operation, the SP1203 module delivers 800 Cd/m² (nits)
LCD screen brightness at a backlight power of 27.5 Watts. With a dimming inverter, the
module can be operated in a reduced brightness mode with lower power consumption and
longer lamp life.
With a wide dimming range of LITEMAX inverter, the SP1203 LCD panel module presents a
super color image over ambient illumination levels from full bright sunshine to total darkness,
making it highly suitable for various outdoor applications.
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2. Optical Performance
The typical SP1203 LCD panel module screen luminance and contrast ratio are shown in the
figures below:
SP1203 Optical Performance
0
100
200
300
400
500
600
700
800
900
-80-70-60-50-40-30-20-10 0 1020304050607080
Viewing Angle
Brightness
Horizontal
Vertical
The LCD screen luminance is measured with the LCD in the 'Off' state (i.e. the pixels are not
energized). This is the 'White' state with maximum luminance. Quite often, this 'Off' state is
brighter than the 'White' displayed on the screen after the LCD is turned on. The difference
maybe caused by the graphics card and/or on the LCD controller card driving this display.
When the LCD is driven properly, the luminance difference between the 'Off' state and the
'White' color should be less than 10 %.
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SP1203 Optical Performance
0
20
40
60
80
100
120
140
160
-80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Viewing Angle
Contrast Ratio
Horizontal
View
Vertical
View
The inherent contrast ratio (CR) of the LCD is the luminance ratio between the 'White' and the
'Black' states measured in a dark room. In outdoor environments, the contrast ratio of the
display drops significantly due to the surface reflections and glare caused by the ambient
illumination at the front surface of the LCD and other surfaces such as touch screen or the
protective window.
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3. Characteristics
Luminance Uniformity 20% or better Note 2
LCD Contrast Ratio 300 White vs Black
Screen Dimming Ratio 100:1 With LI2002 inverter
LCD Screen Chromaticity
White ( LCD in off state ) x=0.3300, y=0.3518 Measured at normal direction
Red x=0.5938, y=0.3375 Measured at normal direction
Green x=0.3119, y=0.5860 Measured at normal direction
Blue x=0.1547, y=0.1386 Measured at normal direction
Viewing Angle
3:00 to 9:00 direction -55 ~ 55 degrees Contrast Ratio >=10
6:00 to 12:00 direction -45 ~ 45 degrees Contrast Ratio >=10
3:00 to 9:00 direction -65 ~ 65 degrees Screen luminance >= 100 nits
6:00 to 12:00 direction -55 ~ 55 degrees Screen luminance >= 100 nits
Backlight Power Consumption 27.5 Watts Excluding inverter losses
LCD Module Weight 3090 Grams with Encasing
Note 1: All data are measured at 25-º C± 2 º C ambient temperature.
Note 2: Uniformity = (Lmax/Lmin-1)*100%.
Lmax (Lmin) is the maximum (minimum) luminance measured with a 10 mm diameter meter aperture over the LCD active
area except the last 10 mm area from the edge.
4. Optical specification, Signal Timing Specification and Signal Timing Wave
Form
In addition to the data described on characteristic, please refer to SHARP LQ121S1DG11 for
other information.
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4. Interface connection
4.1 Electrical Interface Connection
Please refer to SHARP LQ121S1DG11.
5. Backlight Lamp Driving Specification
It is recommended to use an inverter with a 1300 Vrms starting voltage to run the VHB
backlight in the SP1203 LCD panel module. At the maximum LCD screen luminance, the lamp
voltage and current are listed below:
Operating Voltage 470 Vrms
Lamp Current xx mArms
At this driving condition, the backlight delivers the specified maximum LCD screen brightness
with power consumption about 27.5 Watts. Since most inverters used to driver CCFLs have
efficiency between 75 % - 80 %, the total DC power input to the inverter is about 35 Watts.
When the backlight is dimmed down, the power consumption decreases.
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6. Mechanical Characteristics
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B. LITEMAX LI2002 inverter
1. Introduction
LI2002 is a CCFL inverter to operate LITEMAX ultra brightness (UB) backlights. The inverter
has an on-board pulse width modulation (PWM) dimming circuit for extremely wide range
luminance adjustment. Over the entire dimming range, there is no noticeable lamp flickering
and the uniformity of the backlight is well maintained. When using LI2002 with LITEMAX LCD
modules, it is not necessary to synchronize the PWM circuit to vertical sync signal of the LCD.
2. Dimming Control
The LI2002 accepts a 0-5V analog voltage for dimming control. It has a pulse width modulation
(PWM) dimming circuit for luminance adjustment. As the dimming voltage Vd decreases from
+5V, the lamp current waveform is pulse width modulated at a repetition rate high enough to
prevent LCD flicker. Within each PWM cycle, the lamps in the backlight are turned fully 'ON'
for a fraction of the cycle time. The human eyes, being very slow with respect to the PWM rate,
respond to the average light produced over the PWM cycle. As a result, the luminance of the
backlight and/or the LCD screen is approximately to the duty cycle of the PWM waveform.
The lamp current waveform with the PWM circuit Set at less than 100%
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In general, inverters with PWM dimming have a very wide luminance adjustment range. For
most practical cases, the LI2002 inverter can achieve a dimming ratio up to 200:1. Hence, the
luminance of the backlight or LCD screen can be adjusted from 100% to 0.5%.
The 0- 5V dimming voltage can be generated simply by a potentiometer, by a digitally
controlled UP/DOWN counter or a digital potentiometer. The inverter provides a regulated +5V
supply to power the dimming circuit. However, the maximum current drain from this source
should be kept less than 5 mA.
At a Vd input about 0.34V and less, the duty cycle of the PWM waveform is 0% and thus, the
lamps are 'OFF'. In order to fully utilize the available dimming voltage, Vd should be biased to
about 0.34V and then ramping up to 5.0V.
3. Electrical Characteristics
The LI2002 inverter operates at 12V DC input and can drive up to 8 lamps for a maximum
output power about 24.5 Watts. In addition, the inverter has a regulated +5V output serving as
a voltage source for the dimming control circuit.
Electrical Characteristics
Parameters Min Typ Max Units Conditions
Input Voltage (Vin) 11.5 12 12.5
Input current (I) 2.04 Vin=12, Vd=5 V
Lamp Starting Voltage (Vst) 1300 Vrms Vin=12, Vd=5 V
Frequency (f) 55 53 58 Khz
ON/OFF Control -OFF 0 0.2
-ON Floating
Dimming Voltage(Vd)
@ 100% Duty Cycle 4.9 5 Vdc Max brightness
@ 0% Duty Cycle 0.3 0.34 Vdc Zero brightness
5V Output (+5VOUT) 4.85 5 5.3 Vdc 11.5<Vin<12.5V
5V Output Source Current 5
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Absolute Maximum Rating
Parameters Min Max Units
Inverter Input Voltage (Vin) 11 13 Vdc
Operating Temperature Range 0 50 C
Storage Temperature Range -20 80 C
4. Interface Connector
Input Connector (CN1)
Pin# Function
1 5V Output
2 12V Input
3 12V Input
4 Dimming Control
5 Ground
6 Ground
7 ON/OFF Control
5. Mechanical Characteristics
LITEMAX Electronics Inc. reserves the right to make changes to this document and the product, which i
t
describes without notice. LITEMAX Electronics Inc. also shall not be liable for technical or editorial errors o
r
omissions made herein; nor for incidental or consequential damages resulting from the furnishing,
performance, or use of this product. In addition, LITEMAX Electronics Inc. takes no responsibility for damage
caused by improper use of this product, which does not meet the conditions for use specified in this
specification sheet.
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