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參數(shù)資料
| 型號(hào)： | HD66421 |
| 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(jí)灰度的點(diǎn)陣圖形液晶顯示驅(qū)動(dòng)程序） |
| 文件頁(yè)數(shù)： | 20/46頁(yè) |
| 文件大?。?/td> | 201K |
| 代理商： | HD66421 |
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Preliminary
Rev. 1.1E '99.02.10
HD66421
0 0 0
1 1 0 1 1
7 6 5
4 3 2 1 0
Bit
FRC control circuit
Grey scale/colour palette
Physical memory
LCD display state
Configuration of Display Data Bit
Packed Pixel Method
For grey scale display and super reflective
colour display, multiple bits are needed for one
pixel. In the HD66421, two bits are assigned to
one pixel, enabling a four-level grey scale
display and four colour display.
One address, eight bits, specifies four pixels,
and pixel bits 0 and 1 for gray scale are
managed as consecutive bits in one byte.
0 0 0
0 1 0 1 0
7 6 5
4 3 2 1 0
4 pixels/address
Address: n
Figure 15 Packed Pixel Method
Address: n + 1
When grey scale display data is manipulated in
bit units, one memory access is sufficient,
which enables smooth high-speed data
rewriting.
The bit data to input to pin DB7, DB5, DB3
and DB1 become MSB and the bit data to
input via pin DB6, DB4, DB2 and DB0 are
LSB.
Gray scale/Colour palette
The HD66421 uses PWM, Pulse Width
Modulation, technique for gray scale display. A
period of one line is divided into thirty-one or
four and HD66421 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 HD66421 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.
DB7, 5, 3, 1 DB6, 4, 2, 0
Register Name
Default Value
0
0
0
1
1
0
1
1
Grayscale Palette 1
Grayscale Palette 2
Grayscale Palette 3
Grayscale Palette 4
0
0
0
0
0
0
1
0
1
1
1
0
1
1
1
1
1
1
1
1
Table 3 Default Value of Palette Registers
20
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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(shí)電路的240通道驅(qū)動(dòng)器) |
| HD66520T | 160-Channel 4-Level Grayscale Display Column Driver with Internal Bit-Map RAM(點(diǎn)陣圖形LCD160通道驅(qū)動(dòng)器) |
| HD66522 | 160-Channel Column Driver with Internal Bit-Map RAM for Reflective Color Display and Grayscale Display(點(diǎn)陣圖形LCD160通道驅(qū)動(dòng)器) |
| HD66523R | 240-Channel Common Driver with Internal LCD Timing Circuit(帶內(nèi)部LCD定時(shí)電路的240通道驅(qū)動(dòng)器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| HD66520T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66520TA0 | 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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