HD66750 Datasheet, PDF (63/96 Pages) Hitachi Semiconductor – 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions

Table 22 Contrast Adjustment per Bias Drive Voltage
HD66750/1
Bias
1/11
bias
drive
1/10
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
11 x R _{x (VLCD - GND)}
11 x R + VR
10 x R _{x (VLCD - GND)}
10 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
6 x R _{x (VLCD - GND)}
6 x R + VR
5xR
x (VLCD - GND)
5 x R + VR
- LCD drive voltage
adjustment range
: 0.775 x (VLCD-GND) ≤ VDR ≤ 0.995 x (VLCD-GND)
- Limit of potential
:
difference between V4 and GND
2 x R _{x (VLCD-GND)}
11 x R + VR
≥
1.4 [V]
- Limit if potential
:
difference between VLCD and V1
VR
x (VLCD-GND)
11 x R + VR
≥
0.1 [V]
- LCD drive voltage
adjustment range
: 0.757 x (VLCD-GND) ≤ VDR ≤ 0.995 x (VLCD-GND)
- Limit of potential
difference between V4 and GND
:
2xR
10 x R + VR
x (VLCD-GND)
≥
1.4 [V]
- Limit if potential
:
difference between VLCD and V1
VR
10 x R + VR
x (VLCD-GND)
≥
0.1 [V]
- LCD drive voltage
adjustment range
: 0.737 x (VLCD-GND) ≤ VDR ≤ 0.994 x (VLCD-GND)
- Limit of potential
difference between V4 and GND
:
2xR
9 x R + VR
x (VLCD-GND) ≥ 1.4 [V]
- Limit if potential
:
difference between VLCD and V1
VR
9 x R + VR
x (VLCD-GND) ≥ 0.1 [V]
- LCD drive voltage
adjustment range
: 0.714 x (VLCD-GND) ≤ VDR ≤ 0.993 x (VLCD-GND)
- Limit of potential
:
difference between V4 and GND
2 x R _{x (VLCD-GND)}
8 x R + VR
≥
1.4 [V]
- Limit if potential
:
difference between VLCD and V1
VR
x (VLCD-GND)
8 x R + VR
≥
0.1 [V]
- LCD drive voltage
adjustment range
: 0.686 x (VLCD-GND) ≤ VDR ≤ 0.993 x (VLCD-GND)
- Limit of potential
:
difference between V4 and GND
2xR
7 x R + VR
x (VLCD-GND) ≥
1.4 [V]
- Limit if potential
:
difference between VLCD and V1
VR
7 x R + VR
x (VLCD-GND)
≥ 0.1 [V]
- LCD drive voltage
adjustment range
: 0.652 x (VLCD-GND) ≤ VDR ≤ 0.992 x (VLCD-GND)
- Limit of potential
:
difference between V4 and GND
2 x R _{x (VLCD-GND) ≥ 1.4 [V]}
6 x R + VR
- Limit if potential
:
difference between VLCD and V1
VR
x (VLCD-GND) ≥ 0.1 [V]
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 V4 and GND
2xR
5 x R + VR
x (VLCD-GND ) ≥
1.4 [V]
- Limit if potential
:
difference between VLCD and V1
VR
5 x R + VR
x (VLCD-GND )
≥
0.1 [V]
4 x R _{x (VLCD - GND)}
4 x R + VR
- LCD drive voltage
adjustment range
: 0.556 x (VLCD-GND) ≤ VDR ≤ 0.988 x (VLCD-GND)
- Limit of potential
:
difference between V4 and GND
2xR
4 x R + VR
x (VLCD-GND)
≥
1.4 [V]
- Limit if potential
:
difference between VLCD and V1
4
VR
x R + VR
x (VLCD-GND)
≥
0.1 [V]
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