參數(shù)資料
型號: HD66732
廠商: Hitachi,Ltd.
英文描述: Graphics Liquid Crystal Display Controller/Driver Supporting JIS Level-1 and Level-2 Kanji ROM(圖形LCD控制器/驅(qū)動器)
中文描述: 圖形液晶顯示控制器/驅(qū)動器支持日標(biāo)級- 1和第2級漢字光盤(圖形液晶顯示控制器/驅(qū)動器)
文件頁數(shù): 81/133頁
文件大小: 2608K
代理商: HD66732
HD66732
81
Contrast Adjuster
Software can adjust contrast for an LCD by varying the liquid-crystal drive voltage (potential difference
between V
LCD
and V1) through the CT bits of the contrast adjustment register (electron volume function).
The value of a variable resistor (VR) can be adjusted within a range from 0.1 x R through 3.2 x R, where R
is a reference resistance obtained by dividing the total resistance between V
LCD
and V1.
The HD66732 incorporates a voltage-follower operational amplifier for each of V1 to V5 to reduce current
flowing through the internal bleeder resistors, which generate different liquid-crystal drive voltages. Thus,
CT4-0 bits must be adjusted so that the potential difference between V
LCD
and V1 is 0.1 V or higher, and
ones between V4 and GND and between V2 and GND are 1.4 V or higher when liquid-crystal drives.
VLCD
VR
R
R
R0
R
R
GND
HD66732
CT
V1
V2
V3
V4
V5
GND
-
+
-
+
-
+
-
+
-
+
Figure 40 Contrast Adjuster
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