unit designed to accept input from many different
sources. It allows a display to be used with television sys-
tems and PC systems as well.
Philips SXGA Triple-Input Display
Controller
To illustrate how one display system can be used in
multiple applications, let's look at the Philips SXGA
triple-input TFT display system controller, Figure 23-48.
The triple input display system controller accepts input
from analog, digital, and parallel sources. The analog
input accepts the traditional UHF and VHF frequencies.
The digital input accepts HDTV broadcasts over cable, as
well as from personal computer systems. The parallel
interface accepts input from other sources such as USB
connection devices like a camera or a recorder.
The block diagram for the SXGA triple input is dif-
ferent from traditional television. This system requires a
microprocessor and special modules to process digital
information. At the opposite end there is just one output,
the panel port.
You will notice horizontal and vertical sweep controls
typical in a CRT imaging system are absent in this unit.
Since the image is digital, there is no need for such cir-
cuitry. There are several items in the display controller that
are more commonly associated with a computer system.
Standards Organizations
There are several organizations that are presently
creating standards for LCD type panel displays. They are
as follows: Video Electronics Standards Organization
(VESA), Digital Flat Panel (DFP), and Digital Visual
Interface (DVI). The variance has caused much confusion
concerning video display standards, not only for screen
display resolution, but also for standard connector con-
struction. Look at the table in Figure 23-49 for a brief
summary of the three major standards groups involved in
the development of a standard for their individual inter-
est. The VESA workgroup is headed by the VESA
standards organization. The DFP is led by Compaq, and
the DVI is led by Intel. Each group consists of members
from across the television and computer industry.
416 Electronic Communication and Data Systems
Standards for TFT VESA DFP
Max resolution
Connection signal
SXGA
1280 × 1024
SXGA
1280 × 1024
Analog, USB,
IEEE 1394
Digital only
DVI
HDTV
1920 × 1080
Analog and
VESA
Figure 23-49. Various standards for LCD type panel displays.
PARALLEL
VIDEO
INTERFACE
CONTENT
PROTECTION
TMDS
RECEIVER
& DLL
VIDEO
INPUT
DLL
TEST
IMAGE
GENERATOR
3x ADC
& SYNC
INPUT
SELECT
AUTO
ADJUST
COLOR
MATRIX
COLOR
MATRIX
HORZ
DOWN
SCALER
HORZ
DOWN
SCALER
DYN.
NOISE
RED.
JTAG
POWER
MANAGER
PANEL/
MEMORY
DLL
DDR SCRAM
CONTROLLER
STREAM
CONTROLLER
AND
ARBITER
DEINTER-
LACER
VERT
DOWN
SCALER
VERT
DOWN
SCALER
GLOBAL CONTROL
REGISTER FILES
PC SLAVE
COLOR
LUT
DITHER
COLOR
MATRIX
PRE-
PANNING
UP
SCALER
PANNING
AND
OVERLAY
OSD
OUTPUT
TIMING
CONTROLLER
Parallel
video
port
DVI
port
Analog
video
port
Panel
port
Memory port
PC port
MEMORY
TESTER
Figure 23-48. Block diagram of the Philips SAA6714 SXGA triple-input TFT-display controller.