7-12
4-2. Video/RGB Signal SW Section
Fig. 7-17 shows a block diagram of the video/RGB SW
section. The video signal demodulated in R, G and B sig-
nals and the RGB signals input from D-SUB 15P are
switched by each analog switch for RGB. The R signal is
switched by Q530 (µPD74HC4066A), G signal is by Q525
(µPD74HC4066A) and B signal is by Q520 (µPD74
HC4066A). The switching control is carried out by DAC
SW signal and the logic is shown below.
Table 7-5
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
20
19
18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
R
BRIGHTNESS
G
BRIGHTNESS
B
BRIGHTNESS
R
HOLD
R
AMP
G
HOLD
G
AMP
B
HOLD
B
AMP
R
BLANKING
R
OSD MIX
G
BLANKING
G
OSD MIX
B
BLANKING
B
OSD MIX
R
CONTRAST
R
CLAMP
G
CONTRAST
G
CLAMP
B
CONTRAST
B
CLAMP
MAIN
OSD ADJUST
SUB OSD
ADJUST (R)
SUB OSD
ADJUST (B)
MAIN
BRIGHTNESS
OUTPUT (G)
BLK IN
INPUT (R)
V
CC1
(R)
SUB CONTRAST
(R)
GND2 (R)
INPUT (G)
GND IN (G)
V
CC1
(B)
SUB CONTRAST
(B)
GND2 (B)
CP IN
OSD IN (R)
V
CC1
(G)
SUB CONTRAST
(G)
GND2 (G)
INPUT (B)
OSD IN (B)
MAIN
CONTRAST
OUTPUT (R)
HOLD (R)
GND2 (R)
GND2 (B)
OUTPUT (R)
HOLD (B)
SUB OSD
ADJUST (G)
V
CC2
(G)
HOLD (G)
GND2 (G)
NC
V
CC2
(R)
V
CC2
(B)
Fig. 7-18
µ
PD74HC4066A
Pin 5
Pin 6
Video input
LOW
HIGH
RGB input
HIGH
LOW
The control items of the IC are five items; main contrast,
sub contrast for each RGB and brightness. The actual con-
trol is carried out by using DAC. The main OSD adjust-
ment and sub OSD adjustment are fixed.
The brightness and main contrast controls are provided for
the user adjustment, and the sub contrast for RGB is used
to adjust the input level of the LCD drive circuit.
RGB
GND
Q520
Q525
Q530
SELECTOR SIGNAL
Q540 (CXA1315M)
VIDEO
SIGNAL
VIDEO
SIGNAL
BUFFER
BUFFER
BUFFER
14
13
12
11
10
9
8
1
2
3
4
5
6
7
SW
A
SW
D
SW
B
SW
C
V
DD
Fig 7-17
4-3. RGB Signal Amplifier Section
The RGB signal processing section employs a wide band
RGB signal IC applicable to the SVGA signal. Fig. 7-17
shows a block diagram of Q535 (M52320SP). In this sec-
tion, OSD mixing is also carried out in addition to the sig-
nal amplification.
Summary of Contents for TLP411E
Page 1: ...FIE NO 336 9612 Dec 1996 TECHNICAL TRAINING MANUAL 3 LCD DATA PROJECTOR TLP411U TLP411E ...
Page 4: ...1 1 SECTION I MAIN POWER SUPPLY CIRCUIT ...
Page 10: ...2 1 SECTION II LAMP HIGH VOLTAGE POWER SUPPLY CIRCUIT ...
Page 12: ...3 1 SECTION III OPTICAL SYSTEM ...
Page 16: ...4 1 SECTION IV RGB DRIVE CIRCUIT ...
Page 25: ...5 1 SECTION V MICROCOMPUTER ...
Page 39: ...6 1 SECTION VI DIGITAL CIRCUIT ...
Page 63: ...7 1 SECTION VII VIDEO SIGNAL PROCESS CIRCUIT ...
Page 77: ...8 1 SECTION VIII CCD CAMERA CIRCUIT ...
Page 80: ...9 1 SECTION IX FLUORESCENT LAMP INVERTER CIRCUIT ...
Page 83: ...9 4 3 CIRCUIT DIAGRAM Fig 9 5 Cicuit diagram ...
