| Hewlett-Packard HDSP-2xxx Series (HDSP-2001, HDSP-2003, HDSP-2007 LED Displays) | |
| Written by AnubisTTP on 2008-12-15 |
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Hewlett-Packard HDSP-2010 red intelligent LED display (12-pin red glass-on-ceramic DIP)
Hewlett-Packard HDSP-2030 red intelligent LED display (12-pin red glass-on-ceramic DIP)
Hewlett-Packard QDSP-2273 yellow intelligent LED display (12-pin glass-on-ceramic DIP; pictured in thumbnail)
Hewlett-Packard HDSP-2003 green intelligent LED display (12-pin glass-on-ceramic DIP)
Hewlett-Packard QDSP-2021 red intelligent display (12-pin glass-on-ceramic DIP)
Hewlett Packard's HDSP-20XX is an intermediate device, an evolutionary step between purely 'dumb' character displays like the Monsanto MAN-2A and full-featured smart displays like the DL-1414. All control schemes for large strings of 5x7 LED matrix arrays rely on heavy use of shift registers to store the bit patterns being displayed on the device; the 20XX takes the step of moving those shift registers into the display itself. There is no internal character driver or latch on this display, the controlling system must laboriously shift bitmap data into the display, 28 bits at a time. Like columns across each digit are tied together and row data from each column is shifted to adjacent digits instead of adjacent columns, all this results in an exceptionally tedious display to control. Like most high end HP displays, the 20XX series was manufactured in a range of LED colors.
It should be noted that the HDSP-2010 and -2030 are among the few displays ever made to use a red glass and ceramic package. Most similar displays of this era are manufactured with much cheaper red epoxy.
HDSP-2000 Series Datasheet
QDSP-2273 four digit yellow monolithic LED display.
HDSP-2003 four digit green monolithic LED display.
HDSP-2003 driver die, 20x magnification. The green LED dies can be seen to the left and right of the the driver.
HDSP-2003 driver die, 100x magnification.
HDSP-2001 glass and ceramic LED display.
QDSP-2021 four digit monolithic LED display.
HDSP-2010 four digit monolithic LED display.
The HDSP-2010 lacks a full character driver and instead has a pair of shift register dies, each slaved to a set of 5x7 LED arrays.
Under high magnification, each of the die's 14 shift register elements can be clearly seen.
HDSP-2030 four digit monolithic LED display.
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