LQ104V1DG81 Datasheet, PDF (9/20 Pages) Sharp Electrionic Components – TFT-LCD Module

LD-23812B- 6
6-2．LED backlight
Parameter
Ta＝+25℃
Symbol
Min.
Typ.
Max. Unit Remark
Supply voltage
V_DD
10.8
12.0
13.2
V 【Note1】
IDD1
-
400
500
mA 【Note2】
Current dissipation
IDD2
-
-
10
µA 【Note3,4】
Permissive input ripple voltage VRP_BL
-
-
200
mVP-P ^VDD^=+12.0V
High voltage VIH_BL1
9.0
-
V_DD
V 【Note3】
XSTABY Low voltage VIL_BL1
-
-
0.4
V 【Note3】
Leak current ＩIL_XST
-
-
5.0
V 【Note3】
High voltage VIH_BL2
9.0
-
V_DD
V 【Note4】
VBR Low voltage VIL_BL2
-
-
0.4
V 【Note4】
Leak current ＩIL_VBR
-
-
1.5
V 【Note4】
PWM frequency
fPWM
200
-
1,000
Hz 【Note4,5】
PWM duty
DPWM
10
-
100
% 【Note4,5】
Life time
L
50,000
-
(Module)
-
h
【Reference】
【Note6】
【Note1】 On-off conditions for supply voltage
0.9 VDD
t t ^{0.1 VDD}
VDD
78
XSTABY
VBR
Back light
(LED)
PWM
t11
ON
OFF
0.9 VDD
t9
0.1 VDD
t10
t12
OFF
about 300ms ^１
【Note2】 Current dissipation
Typ. value：　VDD= +12V、Duty=100%
Max. value：　VDD= +10.8V、Duty=100%
20µs ≦ t7≦ 200ms １
0ms ≦ t8
0ms ≦ t9
１ 1s ≦ t10
１ 10ms ≦ t11
１ 0ms ≦ t12
【Note3】 XSTABY is connected by the pull-down resistor of about 2.8kΩ.
【Note4】 VBR is connected by the pull-down resistor of about 9.6kΩ.
【Note5】 PWM
fPWM　＝　1/t14
DPWM=T13/T14
VBR
Duty 0% : Min. Luminance
Duty 100% : Max. Luminance
Luminance changes in proportion to the duty ratio.
When the frequency slows, the display fineness might decrease.
t13
t14
【*6】 Luminance becomes 50% of an initial value. (Ta＝25℃, PWM=100%)