Operation Manual
EL640.400-C2, -C3 and -
CD3 Display
Beneq Products Oy
Olarinluoma 9
Tel. +358 9 7599 530
VAT ID FI25115461
FI-02200 Espoo
Fax +358 9 7599 5310
www.beneq.com
Finland
www.lumineq.com
Date: September 23, 2014
Document number: ED000821B
Page | 9
4
Display features
4.1
Display operation modes
The EL640.400-C2, -C3 and -CD3 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 Beneq displays. Timing mode is determined from a 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 centered 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
is pin and timing compatible with the MD640.400 Series displays and the
normal mode of the EL640.400–CB 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 (T3 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 the different timing modes as well as setup and hold timing on page 12-15.
