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| 型號(hào)： | TP6508 |
| 英文描述： | Pushbutton Switch; Actuator Diameter:0.078"; Circuitry:6PDT; Switch Operation:6 Changeover Push-Push; Contact Current Max:100mA; Leaded Process Compatible:Yes; Mounting Type:PCB; Switch Function:6PDT |
| 中文描述： | 顯卡 |
| 文件頁(yè)數(shù)： | 40/134頁(yè) |
| 文件大?。?/td> | 600K |
| 代理商： | TP6508 |
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P.37
* Frame Buffer
For dual-scan STN LCD panel , we must use "acceleration mode ". We can use the shadow frame
buffer technique to fixed it . In the others, VGA has the memory bandwidth limitation , but CRT refresh
rate higher than memory fetch speed. How to solve this series problem , we can add another external
256Kx16-bit DRAM as a LCD frame buffer.
When VGA scans upper panel, frame buffer stores the pixel data of lower panel . Every pixel
needs only one bit to present on/off information . We provide following figures to show operating
procedure:
Left diagram appears actual screen circumstance . A,B,C,D.. AND 1,2,3,4 are the continuous
pixels of upper/lower panel. Right rectangles present the interior data of screen buffer . VGA does
read-modify-write to the frame buffer consecutively . Upper buffer presents continuous process of
scanning VGA upper panel, so does lower panel .
* Color Dithering
For color STN LCD panel , TP6508 can add visual colors by color dithering techniques . The
dithering technique uses a group of dithering pattern in 4 by 4 pixel-block and gray modulation to
generate the gray shades for each of R,G,B . The dithering patterns for each shades is designed so that
it creates minimum flicker and stripping wave on the panel screen.
In the extended indexed register CREG A9 , we can select the various dither algorithm and types
to increase colors of the panels .
* Amplitude Modulation
For color TFT LCD panel, TP6508 can add visual colors except the 24-bit true color panel by
A B C D E...
1 2 3 4 5...
1 2 3 4 5
A' 2 3 4 5
A' B' 3 4 5
........
........
A' B' C' D' E'
A B C D E
1' B C D E
1' 2' C D E
1' 2' 3' 4' 5'
Start Frame
Start Frame
R:1 W:A'
R:2 W:B'
End Frame
End Frame
R:A W:1'
R:B W:2'
SCREEN
SP508B08.GEM 85/02/12 L.R.Y.
Frame
Buffer
DRAMs
VGA
Frame Buffer
DRAMs
Display
Buffer
Display
Buffer
VGA
External Frame Buffer
Shadow Frame Buffer
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| TP6820 | Pushbutton |
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| TP7S8 | TRANSISTOR | BJT | NPN | 80V V(BR)CEO | 7A I(C) | TO-220VAR |
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