參數(shù)資料
型號(hào)： VDP31XXB
廠商： MICRONAS SEMICONDUCTOR HOLDING AG
英文描述： Video Processor Family
中文描述： 視頻處理器系列
文件頁(yè)數(shù)： 15/72頁(yè)
文件大?。?/td> 597K
代理商： VDP31XXB
PRELIMINARY DATA SHEET
VDP 31xxB
15
Micronas
2.8. Display Part
In the display part the conversion from digital YC
r
C
b
to
analog RGB is carried out. A block diagram is shown in
Figure 2
–
20. In the luminance processing path, contrast
and brightness adjustments and a variety of features,
such as black level expansion, dynamic peaking and
soft limiting, are provided. In the chrominance path, the
C
r
C
b
signals are converted to 20.25 MHz sampling rate
and filtered by a color transient improvement circuit. The
YC
r
C
b
signals are converted by a programmable matrix
to RGB color space.
The display processor provides separate control set-
tings for two pictures, i.e. different coefficients for a
‘
main
’
and a
‘
side
’
picture.
The digital OSD insertion circuit allows the insertion of
a 5-bit OSD signal. The color space for this signal is con-
trolled by a partially programmable color look-up table
(CLUT) and contrast adjustment.
The OSD signals and the display clock are synchronized
to the horizontal flyback. For the display clock, a gate
delay phase shifter is used. In the analog backend, three
10-bit digital-to-analog converters provide the analog
output signals.
2.8.1. Luma Contrast Adjustment
The contrast of the luminance signal can be adjusted by
multiplication with a 6-bit contrast value. The contrast
value corresponds to a gain factor from 0 to 2, where the
value 32 is equivalent to a gain of 1. The contrast can be
adjusted separately for main picture and side picture.
L
in
L
out
L
min
L
max
L
t
L
tr
Fig. 2
–
13:
Characteristics of the black level expander
L
tr
BAM
BTHR
BTLT
2.8.2. Black Level Expander
The black level expander enhances the contrast of the
picture. Therefore the luminance signal is modified with
an adjustable, non-linear function. Dark areas of the pic-
ture are changed to black, while bright areas remain un-
changed. The advantage of this black level expander is
that the black expansion is performed only if it will be
most noticeable to the viewer.
The black level expander works adaptively. Depending
on the measured amplitudes
‘
L
min
’
and
‘
L
max
’
of the low-
pass-filtered luminance and an adjustable coefficient
BTLT, a tilt point
‘
L
t
’
is established by
L
t
= L
min
+ BTLT (L
max
–
L
min
).
Above this value there is no expansion, while all lumi-
nance values below this point are expanded according
to:
L
out
= L
in
+ BAM
(L
in
–
L
t
)
A second threshold, L
tr
, can be programmed, above
which there is no expansion. The characteristics of the
black level expander are shown in Fig. 2
–
13 and Fig.
2
–
14.
The tilt point L
t
is a function of the dynamic range of the
video signal. Thus, the black level expansion is only per-
formed when the video signal has a large dynamic
range. Otherwise, the expansion to black is zero. This al-
lows the correction of the characteristics of the picture
tube.
a)
L
min
L
max
L
t
L
t
b)
Fig. 2
–
14:
Black-level-expansion
a) luminance input
b) luminance input and output
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