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Display Features
Display Operation Modes
7
EL640.400-CB1/CB3 and –CD4 Operations Manual (020-0356-00A)
For ordering information of EL640-400-CB1 and other EL Displays, please visit http://www.eldisplays.com/EL640-400-CB1 or call +1-888-394-4998.
The displays have two input timing modes. VGA Mode supports standard 200,
350 and 400 row VGA modes and Normal Mode is similar to Normal Mode in
most Planar displays. The operation mode is determined from combination of
the polarities of the VS and HS pulses and the _BLANK signal at the rising edge
of the VS pulse and the polarities of VS and HS pulses at the rising edge of the
_BLANK pulse.
In VGA modes, the number of columns is determined by the number of VCLK
pulses during a HS pulse. A tolerance of ±1 pulse is accepted.
VGA Modes: The display data and control input is compatible with feature
connector signals from VGA board. The display supports VGA modes 0, 1, 2, 3,
0*, 1*, 2*, 3*, 0+, 1+, 2+, 3+, 4, 5, 6, 7, 7+, D, E, F, 10 and 13. It notifies the
polarity of the HS and VS at the rising edge of BLANK and determines the
number of rows in the mode. Note that in VGA modes 0, 1, 0*, 1*, 0+, 1+, 4,
5, D and 13, where the software uses 320 or 360 columns, the size of
borders varies from one VGA- controller to another. Therefore the image
may not be centered properly using those modes.
The image is centred automatically, and in text modes with 720 pixels
horizontally, every ninth pixel is omitted for compatibility. The non-displayed
pixel is in the space region of the character matrix, and therefore no
information is lost. The borders are normally eliminated because of the
centering. The upper and lower borders are however displayed in the modes
using 350 rows due to extra rows not needed for the picture.
The 480 row VGA modes are not supported. Even if the display does not scan
in these modes (11, 12), it continues to operate with no failures when a
supported mode is detected.
Normal Mode: This mode is pin and timing compatible with MD640.400 Series
displays and the Normal mode of EL640.400–C3/CD3 series displays. In this
mode only four input signals are needed: video data (VID), video clock (VCLK),
horizontal synchronizing (HS) and vertical synchronizing (VS). _BLANK is not in
use and should be pulled high or left disconnected.
In Normal mode the last 640 pixels before the fall of the HS are displayed. The
topmost row displayed is the first HS HIGH time ending after HS Hold from VS
time (T4 in Normal Mode) from the rising edge of VS. If HS is running
continuously, the rising edge of the VS can be simultaneous to the previous
falling or rising edge of the HS. See details on setup and hold timing as well as
Normal Mode timing on page 14.
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