Electrical Characteristics
Item
Operating Temperature Range
Storage Temperature Range
Supply Voltage
Symbol
TOP
TST
VDD
IDD
VIH
VIL
VOH
VOL
Condition
Absolute Max
Absolute Max
Min.
-20
-30
3.0
Typ.
-
-
3.3
40
-
-
-
-
Max.
+70
+80
3.6
-
Unit
⁰C
⁰C
V
mA
V
V
V
V
-
Supply Current
“H” Level Input
“L” Level Input
“H” Level Output
VDD = 3.3V
-
-
-
-
-
2.0
-
VDD-0.4
-
-
0.8
-
0.4
“L” Level Output
Supply Voltage for LED Backlight Driver
Supply Current for LED Backlight Driver
Backlight PWM Frequency
VBL
IBL
IBL
-
2.8
-
-
3.3
520
240
-
5.5
-
-
V
VBL = 3.3V
VBL = 5.0V
-
mA
mA
Hz
fPWM
250
1000
Optical Characteristics
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Top
Optimal
Bottom
Viewing
Left
ϕY+
ϕY-
θX-
θX+
Cr
-
-
-
-
55
75
75
-
-
-
-
-
⁰
⁰
⁰
⁰
-
Cr ≥ 10
Angles
Right
75
Contrast Ratio
Luminance
Response Time
-
-
400
620
-
500
780
25
Lv
TR + TF
-
30
cd/m2
ms
Rise + Fall
TOP = 25°C
Touch Panel Characteristics
Item
Min.
Typ.
-
-
-
-
-
-
7
Max.
1.5
-
80
-
-
Unit
%
%
Linearity
-1.5
Transmittance
Activation Force
80
20
g
Pen Writing Durability
Pitting Durability
Surface Hardness
Haze
100,000
1,000,000
Characters
Touches
3
4
-
10
H
%
Backlight Driver Configuration
The Backlight Driver Enable signal is connected to the FT81x backlight control pin. This signal is controlled by two
registers: REG_PWM_HZ and REG_PWM_DUTY. REG_PWM_HZ specifies the PWM output frequency – the range
available on the FT81x is 250 to 10000Hz, however the on-board backlight driver’s max PWM frequency is 1000Hz.
Therefore, for proper use of the PWM function available on this module, the PWM frequency should not exceed 1000Hz.
REG_PWM_DUTY specifies the duty cycle – the range is 0 to 128. A value of 0 turns the backlight completely off, while a
value of 128 provides maximum backlight brightness.
For the above register definitions, please refer to pages 80-81 of the official FT81x Series Programmers Guide:
http://www.ftdichip.com/Support/Documents/ProgramGuides/FT81X_Series_Programmer_Guide.pdf
[6]
NEWHAVEN [ NEWHAVEN DISPLAY INTERNATIONAL, INC. ]
