NL10276AC30_04L NEC, NL10276AC30_04L Datasheet - Page 13

• Manufacturer Part Number: NL10276AC30_04L
• Description: TFT COLOR LCD MODULE
• Manufacturer: NEC

(4) Luminance control
[OUTSIDE CONTROL FOR LUMINANCE]
How to adjust
Frequency
“L” period
Pulse-width
Luminance
Input voltage
Parameters
Form
Outside control is valid, when PWSEL=”L” and input signal for BRTP. Luminance can be controlled by the
duty value of input signal for BRTP.
BRTC must not fix on "L" in the condition of PWSEL= "L" and BRTC ="H" or "Open". Otherwise, the
inverter stops. In this case, even if BRTP pulse is input again, the backlight will not turn on. Please input
power supply to the inverter again.
Duty=20%: luminance is minimum.
Duty=100%: luminance is maximum.
Note1: Regarding set up for frequency, refer to the below method.
Note2: The backlight is turned off with safety circuit, when “L” period of BRTP signal is input more than 50
BRTP
Adopt the frequency evaluating the display quality, because the display will be disturbed depend on
frequency.
ms.
See OUTSIDE
CONTROL
FOR
LUMINANCE
1/tPW
tLPW
tHPW/tPW
Lu
ViL
ViH
PWSEL=“L”
Symbols
ViH
50%
PWM
ViL
Set up frequency = Vsync frequency × (n+0.25) or (n+0.75)
Min.
185
4.5
BRTH should be fixed to 0V to control
luminance by voltage. The range of
input voltage between BRTL and
GNDB is as follows.
Maximum luminance: 1V(100%)
Minimum luminance: 0V(30%)
－
20
30
－
Typ.
－
－
－
－
－
－
tHPW
Voltage
Max.
340
100
100
0.6
50
－
PWSEL=“H” or “Open” and BRTP=”OPEN”
tPW
Units
Hz
ms
%
%
V
V
Duty=100%: Luminance is maximum.
Duty=20%: Luminance is minimum.
The variable resistor for luminance control
should be 10 kΩ type, and zero point of the
resistor corresponds to the minimum of
luminance.
ACA=H
Maximum luminance: R=10 kΩ(100%)
Minimum luminance : R= 0 Ω(30%)
Mating variable resistor: 10 kΩ
B curve, 1/10W
tLPW
BRTH
NEC Corporation
Variable resistor
Remarks
Note1
Note2
－
－
－
DOD-H-8237
R
BRTL
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