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參數(shù)資料
| 型號： | HT1647(100QFP)A |
| 英文描述： | Controller Miscellaneous - Datasheet Reference |
| 中文描述： | 控制器雜項-數(shù)據(jù)表參考 |
| 文件頁數(shù)： | 11/22頁 |
| 文件大小： | 201K |
| 代理商： | HT1647(100QFP)A |
Relationship table between PWM data and gray scale
HT1647
Rev. 1.00
11
June 1, 2001
Name
Command Code
Function
FRAME 170Hz
X
100
-0001-1000-XXXX
Select 170Hz frame frequency and active segment
signal width can be divided into 13 sections
FRAME 89Hz
X
100
-0001-1101-XXXX
Select 89Hz frame frequency and active segment sig-
nal width can be divided into 24 sections
Frame frequency selection command code
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Table 1: FRAME 89Hz mode
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Table 2: FRAME 170Hz mode
Note: The varied PWM data displays various
gray scale in TN-type, STN-type LCDs.
The color display derives from ECB-type
LCD s specification.
satisfactory gray scale in every level. HT1647 pro-
vides 5-bit PWM data to control the length of the
section. In other words, a max. Of 24 gray scales
are generated by 5-bit binary PWM data. At
FRAME 89Hz mode, the HT1647 only provides a
max. of 24 adjustable gray scales although 32 is
the expressed max. value by 5 bits binary code.
When5bitsbinarycodevalueismorethan23,the
PWM control circuit uniformly regards 23. To in-
crease PWM data indicates to increase the length
of the active segment signal. The varied length of
the active segment signal displays varied gray
scale in TN-type, STN-type LCDs (refer to table
1). Similarly, it displays varied color in ECB-type
LCDs. The color display is derived from
ECB-type LCD specification. At FRAME 170Hz
mode, the HT1647 only provides a max. of 13 ad-
justable gray scales although 32 is the expressed
max. value by 5 bits binary code. When the 5 bits
binary code value is more than 12, the PWM con-
trol circuit uniformly regards 12. The user must
appoint four kinds of PWM data to four kinds of
different gray scale level by commanding PWM
data (refer to table 2).
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