參數(shù)資料
型號(hào)： HD66728
廠商： Hitachi,Ltd.
英文描述： 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點(diǎn)圖形LCD控制器)
中文描述： 112 × 80點(diǎn)圖形LCD控制器/驅(qū)動(dòng)器（112 × 80點(diǎn)圖形液晶顯示控制器）
文件頁(yè)數(shù)： 115/138頁(yè)
文件大?。?/td> 2158K
代理商： HD66728
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HD66728
115
Partial-display-on Function
The HD66728 can program the liquid crystal display drive duty ratio setting (NL3-0 bits), liquid crystal
display drive bias value selection (BS2-0 bits), boost output level selection (BT1/0 bit) and contrast
adjustment (CT5-0 bits). For example, in the 10-line display mode (1/80 duty ratio), the HD66728 can
selectively drive only the center of the screen or only the top or bottom of the screen by combining these
register functions and the centering display (CN1–0 bit) function. This is called partial-display-on.
Lowering the liquid crystal display drive duty ratio as required saves the liquid crystal display drive
voltage, thus reducing internal current consumption. This is suitable for four-line display of a calendar or
time, or the display of only graphics icons (pictograms) at the top or bottom of the screen, which needs to
be continuous in the system standby state with minimal current consumption. Here, the non-displayed lines
are constantly driven by the unselected level voltage, thus turning off the LCD for the lines.
In general, lowering the liquid crystal display drive duty ratio decreases the optimum liquid crystal display
drive voltage and liquid crystal display drive bias value. This reduces output multiplying factors in the
booster and greatly controls consumption current.
Table 40 Partial-display-on Function (10-line Display)
Item
Normal 10-line Display
Partial-on Display (Limited 4-line Display)
LCD screen
10th line displayed
Only four lines on the
center of the screen
(from the 3rd to 6th
lines)
Only four lines at the top
and bottom of the
screen (from the 1st to
3rd and 10th lines)
LCD drive position
shift
Not necessary
(CN1–0 = 00)
Necessary
(CN1–0 = 01)
Necessary
(CN1–0 = 01)
LCD drive duty ratio
1/80 (NL3–0 = 1001)
1/32 (NL3–0 = 0011)
1/32 (NL3–0 = 0011)
LCD drive bias
value (optimum)
1/10 (BS2-0 = 000)
1/6 (BS2-0 = 101)
1/6 (BS2-0 = 101)
LCD drive voltage*
12 V to 15 V
(adjustable using CT5–0)
6 V to 8 V
(adjustable using CT5–
0)
6 V to 8 V
(adjustable using CT5–
0)
Boosting output
multiplying factor
Five times (BT1–0 = 10)
Triple (BT1–0 = 00)
Triple (BT1–0 = 00)
Frame frequency
(fosc = 90 kHz)
Note:
The LCD drive voltage depends on the LCD materials which are actually used. Since the LCD drive
voltage is high when the LCD drive duty ratio is high, a low duty ratio is suitable for low-power
consumption.
70 Hz
88 Hz
88 Hz
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參數(shù)描述
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HD66731 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
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