Toshiba TLP510E Manuale di formazione tecnica - Pagina 27
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Stampa la pagina6-2-6. Picture Size of View Conversion IC T-FORC
(QX204, QX404, QX604)
A configuration of T-FORC is shown in Fig. 6-2-5. The
T-FORC is a newly developed picture size conversion IC.
By using the IC, smooth picture enlargement and
reduction, and format conversion will be made. Also, a
gamma correction circuit is built in the IC.
Memory
Freeze
MEMORY
INTERFACE
GAMMA
FORMAT
(LOOK UP
CONVERTER
TABLE)
MEMORY
INTERFACE
Memory
Fig. 6-2-5
6-2-7. Memory
The memory uses four general 4 M bits EDO-DRAMs
(256k
16 bits) per 1 channel.
6-2-8. Exchange PLD
A configuration of timing signal generation PLD is
shown in Fig. 6-2-6. In the unit, the signal process is
carried out in parallel by dividing the process into two
systems. In order to reduce the characteristic difference
between these two systems, the signals of both systems
are switched for every 1 line and 1 frame. The PLD
carries out the process. Also, the ON-SCREEN display
signal superimposing, addition of non-display section for
top and bottom and left and right, etc. are carried out by
the PLD.
OSD SW
BLK SW
(NOT USED)
Input CLK
System CLK
BUS
(42 MHz)
INTERFACE
Panel CLK
(32.5 MHz)
MPU
Video
SW
signal
Video
SW
signal
SEL
From
timing PLD
6-2-9. D/A Converter
MB40950 is a 10 bits 3 channels D/A converter of which
max. conversion speed is 60 MHz. In order to reduce the
difference of two systems of each RGB channel, each
RGB channel possesses one IC respectively. So one
channel of 3 channels D/A converter built in the IC is not
used. The output signal level ranges from 3.0 to 5.0V.
6-6
OSD, OSDI, PBLK
Video
signal
OSD SW
BLANKING SW
Video
signal
PANEL TIMING
To LCD panel
TRIM
(ENB, DX)
MPU
Fig. 6-2-6