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參數(shù)資料
| 型號： | HD667B66R |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 132 x 176-dot Graphics LCD Controller/Driver for 65K Colors |
| 中文描述： | 132 × 176點圖形LCD控制器/驅(qū)動器的65K色 |
| 文件頁數(shù)： | 74/97頁 |
| 文件大?。?/td> | 681K |
| 代理商： | HD667B66R |
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HD66766R Rev. 1.0-1 / September 2002
74
How to determine the power setting value
1.
Determine LCD drive bias
Determine LCD drive bias first. LCD drive bias is theoretically (1/SQRT (display duty)) optimal;
however, the total drive voltage can be reduced by lowering bias ratio. Consider the display quality, the
drive voltage and the current consumption.
2.
Determine VOUT voltage
Determine factor of Vc1 regulator and step-up factor so as to set output voltage, VOUT of step-up circuit
1 4.0 to 5.75V, setting input voltage Vci2 of step-up circuit 2 more than +0.5V. Since the entire electric
power for driving LCD is supplied from step-up circuit, subsequent voltage fall need to be considered.
3.
Segment drive voltage calculation
Segment output drive voltage is calculated by the following expression.
x VTH
Vth: LCD threshold voltage
4.
Common drive voltage calculation
Common output drive voltage is calculated by the following expression.
B : LCD drive bias ratio
5.
Determine input voltage of step-up circuit 2
Determine input voltage of step-up circuit 2. This voltage is determined by dividing Vcom voltage by
step-up factor; lower factors are used for low current consumption. Vci2 voltage need to be less than
VOUT voltage (4.0 to 5.75 V)- 0.5V.
Example of register setting on power supply
Examples of register setting values on power supply are described below.
Example 1:
1/176 duty ratio, Vcc = VREFL = 3.0V, 1/13 bias
BS3-0 = H’8
: bias adjustment 1.4 times
BT2-0 = H’4
: step-up circuit 1 2 times step-up circuit 2 5 times
BT3 = H’1
: operate voltage inverting circuit
DC2-0 = H’6
TBD
step-up circuit 1 frequency 32 clocks step-up circuit 2 frequency 128 clocks
AP1-0 = H’1
: low fixed current in the amplifier
VC2-0 = H’0
: Vci1 = 0.92 x Vcc = 2.75V
VR2-0 = H’0
: VREFM = 1.1 x VREFL
CT6-0
: appropriate contrast setting values
2 x B
(B-1)
Vseg =
Vcom =
2
Vseg
x (B+1)
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