HD66740 Datasheet, PDF (54/95 Pages) Hitachi Semiconductor – 112 x 80-dot Graphics LCD Controller/Driver

HD66740
Table 20 Contrast Adjustment per Bias Drive Voltage
Bias
1/10
bias
drive
1/9.5
bias
drive
1/9
bias
drive
1/8
bias
drive
1/7
bias
drive
1/6
bias
drive
1/5
bias
drive
1/4
bias
drive
LCD drive voltage: VDR
Contrast adjustment range
10 x R _{x (VLCD - GND)}
10 x R + VR
- LCD drive voltage
adjustment range
: 0.757 x (VLCD-GND) ≤ VDR ≤ 0.995 x (VLCD-GND)
- Limit of potential
:
difference between V5 and GND
R
x (VLCD-GND)
10 x R + VR
≥
0.4 [V]
- Limit if potential
:
difference between VLCD and V1
VR
x (VLCD-GND)
10 x R + VR
≥
0.4 [V]
9.5 x R _{x (VLCD - GND)}
9.5 x R + VR
9xR
9 x R + VR ^{x (VLCD - GND)}
8 x R _{x (VLCD - GND)}
8 x R + VR
7xR
x (VLCD - GND)
7 x R + VR
- LCD drive voltage
adjustment range
: 0.748 x (VLCD-GND) ≤ VDR ≤ 0.994 x (VLCD-GND)
- Limit of potential
difference between V5 and GND
:
R
9.5 x R +
x (VLCD-GND)
VR
≥
0.4 [V]
- Limit if potential
difference between
VLCD
and
:
V1
9.5
VR
xR+
VR
x
(VLCD-GND)
≥
0.4 [V]
- LCD drive voltage
adjustment range
: 0.737 x (VLCD-GND) ≤ VDR ≤ 0.994 x (VLCD-GND)
- Limit of potential
difference between V5 and GND
:
R
9 x R + VR
x (VLCD-GND) ≥ 0.4 [V]
- Limit if potential
:
difference between VLCD and V1
VR
9 x R + VR
x (VLCD-GND) ≥ 0.4 [V]
- LCD drive voltage
adjustment range
: 0.714 x (VLCD-GND) ≤ VDR ≤ 0.993 x (VLCD-GND)
- Limit of potential
:
difference between V5 and GND
R
x (VLCD-GND) ≥ 0.4 [V]
8 x R + VR
- Limit if potential
:
difference between VLCD and V1
VR
x (VLCD-GND)
8 x R + VR
≥
0.4 [V]
- LCD drive voltage
adjustment range
: 0.686 x (VLCD-GND) ≤ VDR ≤ 0.993 x (VLCD-GND)
- Limit of potential
:
difference between V5 and GND
R
7 x R + VR
x (VLCD-GND) ≥
0.4 [V]
- Limit if potential
:
difference between VLCD and V1
VR
7 x R + VR
x (VLCD-GND)
≥ 0.4 [V]
6 x R _{x (VLCD - GND)}
6 x R + VR
5xR
5 x R + VR ^{x (VLCD - GND)}
4 x R _{x (VLCD - GND)}
4 x R + VR
- LCD drive voltage
adjustment range
: 0.652 x (VLCD-GND) ≤ VDR ≤ 0.992 x (VLCD-GND)
- Limit of potential
:
difference between V5 and GND
R
x (VLCD-GND)
6 x R + VR
≥
0.4 [V]
- Limit if potential
:
VR
x (VLCD-GND) ≥ 0.4 [V]
difference between VLCD and V1 6 x R + VR
- LCD drive voltage
adjustment range
: 0.610 x (VLCD-GND ) ≤ VDR ≤ 0.990 x (VLCD-GND)
- Limit of potential
:
difference between V5 and GND
R
x (VLCD-GND ) ≥ 0.4 [V]
5 x R + VR
- Limit if potential
:
difference between VLCD and V1
VR
5 x R + VR
x (VLCD-GND )
≥
0.4 [V]
- LCD drive voltage
adjustment range
: 0.556 x (VLCD-GND) ≤ VDR ≤ 0.988 x (VLCD-GND)
- Limit of potential
:
difference between V5 and GND
R
4 x R + VR
x (VLCD-GND)
≥
0.4 [V]
- Limit if potential
:
difference between VLCD and V1
4
VR
xR+
VR
x
(VLCD-GND)
≥
0.4 [V]
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