Functional description

STV9211

10/37

2.6

Drive adjustment (3 x 8 bits)

In order to perform the “White balance” adjustment, the gain of the three RGB signals are adjustable

The very large range of the Drives (48 dB) allows different standards or custom color temperatures.

It can also be used to adjust the output voltages at the optimum amplitude to drive the CRT drivers,

keeping the whole contrast control for the end-user only.

Figure 6: Drive adjustment

Adjustment

Channel

each channel

Independantly

Register

name / address

Number step / resolution

min / max

Attenuation

DRV = min

D

RV

=m

ax

DR

V =

Typ

Drive

DRV / 03, 04, 05

256 (8 bit) / 0,19 dB

0 / - 48 dB

DRV = min

DR

V =

ma

x

DR

V =

Typ

Case #1: Brightness before Drive

Register 13, b6=0

Register 13, b6=1

BLK

Output

Output

Case #2: Brightness after Drive

Black levels

InfraBlack level

Black level

InfraBlack level