Toshiba TLP-710U Руководство по техническому обучению - Страница 9

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Toshiba TLP-710U Руководство по техническому обучению

3-2. General Operation of Each IC and

Signal Flow

3-2-1. Input Amplifiers (Q408, Q508 and Q608)

These circuits amplify the video signal to the input level

adequate for the gamma process IC (Q701) in the next stage.

The internal circuit possesses the clamp circuit, amplifier

circuit, which controls the gain by the DC voltage sent from

the 8 bit DA for electronic variable resistor (Q905), and

o u t p u t c i r c u i t .

For the input terminals, 16 pins are used, for the output

terminals, 8 pins and for gain control terminals, 4 pins.

3-2-2. Gamma Process IC (Q701)

Fig. 3-2-1 shows the gamma process IC (Q701).

Fig. 3-2-1 Block diagram of gamma process IC (Q701)

Fig. 3-2-2 Signal path

This IC functions to clamp, process gamma and amplify

each of RGB signals. The main features are as follows;

• Gamma circuit: Adjusts gain and position in three

• F c h a r a c t e r i s t i c : 100 MHz

• Through rate:

• Control:

This IC performs gamma control for the panels and make

output signals supplied to the alternation/sample & hold

ICs (Q401, Q402, Q501, Q502, Q601 and Q602) in the

next stage.

The signal path is shown in Fig. 3-2-2.

3-2

points (white side: 1, black side: 2)

for RGB each separate adjustment.

375

Carried out by I