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Toshiba TLP511E User Manual

Page 27

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6-6

6-2-6. 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.

Fig. 6-2-5

6-2-7. Memory

The memory uses four general 4 M bits EDO-DRAMs

(256k

x 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.

Memory

Freeze

MEMORY

INTERFACE

FORMAT

CONVERTER

GAMMA

(LOOK UP

TABLE)

OSD SW

BLK SW

(NOT USED)

BUS

INTERFACE

Memory

MPU

Input CLK

System CLK
(42 MHz)

Panel CLK
(32.5 MHz)

MEMORY

INTERFACE

OSD, OSDI, PBLK

Video

signal

Video

signal

Video
signal

Video
signal

SEL

From

timing PLD

SW

SW

OSD SW

BLANKING SW

PANEL TIMING

TRIM

To LCD panel
(ENB, DX)

MPU

Fig. 6-2-6

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.

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