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參數(shù)資料
| 型號： | HD66420 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD) |
| 中文描述： | （內(nèi)存提供160通道4級灰度的點陣圖形液晶顯示驅(qū)動程序） |
| 文件頁數(shù)： | 21/52頁 |
| 文件大小： | 167K |
| 代理商： | HD66420 |
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HD66420
21
Gray scale/Colour palette
The HD66420 uses PWM, Pulse Width Modulation, technique for gray scale display. A period of one line
is divided into thirty-one or four and HD66420 outputs turn-on levels for one period and turn-off levels for
rest of these period. This technique changes gray scale on monochrome display and colour on super
reflective colour panel. The characteristics of these panel vary with different panel. To allow for this, the
HD66420 designed to generate 32-levels gray scale levels and provides palette registers that assign desired
levels to certain of the four colours, GRAY = 0, or generate dedicated 4-level grayscale , GRAY = 1. Using
the palette registers to select any 4 out of 32 levels of applied voltages enables an optimal grayscale/colour
display. Because of this grayscale technique using 32-levels gray scale needs higher clock rate. If 32-levels
gray scale is not needed, lower clock rate can be used. Table 3 shows default value of palette registers and
Table 4 and 5 show relationship between value of a palette register and grayscale level.
Table 3 Default Value of Palette Registers
DB7, 5, 3, 1
DB6, 4, 2, 0
Register Name
Default Value
0
0
Grayscale Palette 1
0
0
0
0
0
1
Grayscale Palette 2
0
1
0
1
1
1
0
Grayscale Palette 3
1
0
1
1
1
1
Grayscale Palette 4
1
1
1
1
1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD66420TA0 | LCD Display Driver |
| HD66421 | (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD) |
| HD66421TB0 | (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD) |
| HD66503 | 240-Channel Common Driver with Internal LCD Timing Circuit(帶內(nèi)部LCD定時電路的240通道驅(qū)動器) |
| HD66520T | 160-Channel 4-Level Grayscale Display Column Driver with Internal Bit-Map RAM(點陣圖形LCD160通道驅(qū)動器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66420TA0 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:LCD Display Driver |
| HD66421 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:(RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD) |
| HD66421TB0 | 制造商:Renesas Electronics Corporation 功能描述: |
| HD66503 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66520 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
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