hello everyone
today let's learn
about the display signal output by PCH
the display signals output by PCH mainly include
LVDS signal TMDS signal and RGB signal
for example LVDS signal output by PCH
is usually used for notebook screen display
the RGB signal output by PCH is used for VGA interface
VGA interface is usually used
to connect an external monitor or projector
the TMDS signal output by PCH
is usually used for HDMI interface
usually also used to connect a projector
or an external display device
for LVDS signals
this is called a low voltage differential signal
which is a digital signal
for example in the figure below
the t X out O and t X out one
TX out O refers
to the zeroth group of LVDS differential signals
TX out one refers
to the first group of LVDS differential signals
next TX out
2 refers to the second
group of LVDS differential signals
there are 3 groups in total
this is a repair of clocks
TX clock
this is the LVDS differential signal
it consists of 3 sets of data plus a pair of clocks
this is RGB we often see VG8 interface or CRT interface
refers to this interface
it uses an analog signal
usually there are 3 colors of red grain and blue
those are the 3 primary colors of R
G and B we're talking about here
RGB is the most common display skim
when discipline color images
RGB signal is also known as VGA signal
in addition to the 3 primary colors of red
green and blue
there is also a horizontal and
vertical synchronation signal
this is the horizontal synchronation signal
this is the vertical synchronation signal
we call them horizontal and
vertical synchronation signal
RGB is usually the display
signal compose of these 5 lines
HDMI interface is like this
this is the HDMI interface
plug in the HDMI cable
and the transmitted signal is a digital signal
this interface can transmit both video and audio
we call it a differential signal
using a differential drive method
also known as transition minimized
differential signaling
here is a set of clocks
this is group 0
this is group one
this is group 2
it consists of 3 groups of data
lines and a pair of clocks
there is a hot plug detect signal
here is the power supply for its interface
the 15th pin s C L and the 16th pin s d a
are its I square C bus
also called System Management bus
this is the signal of the HDMI interface
their data transmission is through these 3 data lines
plus a pair of clocks
other pins are its working conditions
this is the HDMI interface that connects
to the external display
these are the 3 display signals output by the PCH
usually in Intel chip sets
PCH chip sets before each series support LVDS
TMDS RGB display signal output
chip sets after the 100
series gradually cancel the display signal output
by the PC H instead
the display signal is directly output by the CPU
