STV2050A datasheet(45/83 Pages) STMICROELECTRONICS

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STV2050A - CONVERGENCE

9 CONVERGENCE

The STV2050A generates convergence values from parameters which are stored in the em-

bedded RAM after having being loaded down from the EEPROM. These parameters can be:

– Common for the entire screen area for each color. They are called “common values”. They

are used for global adjustments, as they have the same effect on all the convergence values

of the same color and in the same direction (horizontally or vertically).

They are used mainly:

– To pre-adjust the geometry and convergence, as well as to reduce the necessary action on

each separate point,

– To compensate the tolerances of the offset and gain for the external components.

– Dedicated to each value of the net of 16 points horizontally by 13 points horizontally. They

are called “dynamic values”,

– Added as an offset frame by frame (interlacing),

– Forced to special values in alignment modes or during startup and security modes.

Figure 26. Convergence Values Computation Path

9.1 GLOBAL ADJUSTMENTS - COMMON PARAMETERS

Three sets of parameters are available for each red, green and blue channel for each hori-

zontal and vertical direction:

– Position offset,

– Gain correction,

– Offset canceller.

Dynamic

values

Position

Offset

(" Static" )

E1 , E2

Gain correction

coarse : E0

fine : D0, D1

Field offset

canceller

D2, D3

convergence

outputs

Common values

Interlace

Measuring

Calibration

DC, DD

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