HD66724 Datasheet, PDF (74/117 Pages) Hitachi Semiconductor – (Graphics LCD Controller/Driver with Key Scan Function)

HD66724/HD66725
Table 38 Contrast Adjustment per Bias Drive Voltage
Bias
1/6.5
bias
drive
1/6
bias
drive
1/5.5
bias
drive
1/5
bias
drive
1/4.5
bias
drive
1/4
bias
drive
LCD drive voltage: VDR
Contrast adjustment range
6.5 x R _{x (VLCD - GND)}
6.5 x R + VR
- LCD drive voltage
adjustment range
: 0.670 x (VLCD-GND) ≤ VDR ≤ 0.985 x (VLCD-GND)
- Limit of potential
:
difference between V5 and GND
R
x (VLCD-GND)
6.5 x R + VR
≥
0.1[V]
- Limit if potential
:
difference between VLCD and V1
VR
x (VLCD-GND)
6.5 x R + VR
≥
0.1[V]
6 x R _{x (VLCD - GND)}
6 x R + VR
5.5 x R
5.5 x R + VR ^{x (VLCD - GND)}
5xR
x (VLCD - GND)
5 x R + VR
- LCD drive voltage
adjustment range
: 0.652 x (VLCD-GND) ≤ VDR ≤ 0.984 x (VLCD-GND)
- Limit of potential
:
difference between V5 and GND
R
x (VLCD-GND)
6 x R + VR
≥
0.1[V]
- Limit if potential
:
difference between VLCD and V1
VR
x (VLCD-GND)
6 x R + VR
≥
0.1[V]
- LCD drive voltage
adjustment range
: 0.632 x (VLCD-GND) ≤ VDR ≤ 0.982 x (VLCD-GND)
- Limit of potential
difference between V5 and GND
:
R
x
5.5 x R + VR
(VLCD-GND)
≥
0.1[V]
- Limit if potential
:
difference between VLCD and V1
5.5
VR
xR+
VR
x
(VLCD-GND)
≥
0.1[V]
- LCD drive voltage
adjustment range
: 0.610 x (VLCD-GND ) ≤ VDR ≤ 0.980 x (VLCD-GND)
- Limit of potential
:
difference between V5 and GND
R
5 x R + VR
x (VLCD-GND ) ≥
0.1[V]
- Limit if potential
:
difference between VLCD and V1
VR
5 x R + VR
x (VLCD-GND )
≥
0.1[V]
4.5 x R
x (VLCD - GND)
4.5 x R + VR
4 x R _{x (VLCD - GND)}
4 x R + VR
- LCD drive voltage
adjustment range
: 0.556 x (VLCD-GND) ≤ VDR ≤ 0.978 x (VLCD-GND)
- Limit of potential
:
difference between V5 and GND
4.5
R
xR
+
x
VR
(VLCD-GND)
≥
0.1[V]
- Limit if potential
:
difference between VLCD and V1
4.5
VR
xR
+
VRx
(VLCD-GND)
≥
0.1[V]
- LCD drive voltage
adjustment range
: 0.556 x (VLCD-GND) ≤ VDR ≤ 0.976 x (VLCD-GND)
- Limit of potential
:
difference between V5 and GND
R
4 x R + VR
x (VLCD-GND)
≥
0.1[V]
- Limit if potential
:
difference between VLCD and V1
VR
4 x R + VR
x (VLCD-GND)
≥
0.1[V]
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