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PDF MGLS240128 Data sheet ( Hoja de datos )
| Número de pieza | MGLS240128 | |
| Descripción | Display APPLICATION NOTE | |
| Fabricantes | ETC | |
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Application Note
AN1631
MGL(S) 240128 Display
July 2001
_______________________________________________________________________________________________________________________
MGL(S) - 240128
DISPLAYS
APPLICATION NOTE
Prepared for
TRIDENT MICROSYSTEMS LTD
PERRYWOOD BUSINESS PARK
HONEYCROCK LANE
SALFORDS
REDHILL
SURREY
RH1 5JQ
By
AND SOFTWARE LTD
4 FOREST DRIVE
THEYDON BOIS
ESSEX
CM16 7EY
_______________________________________________________________________________________________________________________
© AND SOFTWARE LTD
Page 1 of 37
1 page  
Application Note
AN1631
MGL(S) 240128 Display
July 2001
_______________________________________________________________________________________________________________________
1 . 4 GLOSSARY OF TERMS AND ABBREVIATIONS
LSB
MCU
MSB
RAM
ROM
VDD
VO
VSS
Least Significant Bit or Least Significant Byte
Microcontroller
Most Significant Bit or Most Significant Byte
Random Access Memory (i.e. Read/Write Memory)
Read Only Memory
The nominal 5 volt supply fed to the module
The Operating Voltage used to derive the signals which drive the
display glass. A relatively large negative voltage (-15->-20 volts)
is usually required. The details depend on the fluid used in the
module and on temperature.
The nominal 0 volt supply fed to the module
1 . 5 REFERENCES
The following documents give background information on the module and the Toshiba
controller on which it is based.
Reference 1
Document
Doc. No.
Date
Version
Author
T6963C DATA SHEET
-
-
-
-
Reference 2
Document
Doc. No.
Date
Version
Author
VARITRONIX - Liquid Crystal Modules (data sheet / short form
catalogue)
-
11/96
-
Varitronix
_______________________________________________________________________________________________________________________
© AND SOFTWARE LTD
Page 5 of 37
5 Page 
Application Note
AN1631
MGL(S) 240128 Display
July 2001
_______________________________________________________________________________________________________________________
3 . 6 RECOMMENDED POWER UP SEQUENCE
It is necessary to apply the VDD supply to the module significantly before the VO supply. If
this sequence is not followed a phenomenon known as 'reverse domain twist' can occur and
the result can be that pixels come on when they shouldn’t. Typically when this does occur,
the effect is almost unnoticeable immediately after a power on when only a few such pixels
may be seen but the effect gradually worsens over a few minutes. Close examination
shows that an affected pixel initially turns on in part (such as the top left hand corner of
the pixel) only, but over the course of a few minutes the effect spreads across the whole
pixel, and is unaffected by the pixel being rewritten or refreshed by the controlling
software application.
3 . 6 . 1 POWER UP SEQUENCING IN THE EXAMPLE DESIGN
In the example design the VO power supply was simply slugged to produce approximately
100 milliseconds delay after the application of the VDD supply.
4. MODES
RAM contents can be read and written by the application using appropriate commands and
indeed writing data to the RAM is the fundamental way that applications get their data
onto the LCD screen.
The T6963C is a little unusual in that it typically uses differing areas in the same RAM space
for its text, character generator look-up tables and low level graphic pixel data.
The details of how the RAM is interpreted by the T6963C to determine which pixels are
displayed depends on the 'mode'.
4 . 1 WHAT THE DATA SHEET MEANS BY 'MODE'
There is some confusion in the T6963C data sheet's use of the terms 'mode' and/or 'display
mode'.
A clear view can be obtained by focusing on the two distinct commands involved. These
are shown in the following table along with some new suggested names in addition to the
corresponding T6963C data sheet names:
_______________________________________________________________________________________________________________________
© AND SOFTWARE LTD
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