DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
These Nine-Digit Calculator Numeric Seven-Segment LED Displays are intended for use under pulsed conditions by enabling the common cathode of each digit sequentially and enabling the desired Segment and Decimal Point anodes in phase with the character enabling pulse. The pulse rate is kept high enough so that light from each character appears to the eye to be constant.
The DIS206C Nine-Digit display assembly uses Chip-on-Board (COB) technology with each character formed by bonding a tiny LED chips integrating either their seven Segment Bars or their Decimal Point directly to a printed circuit board (PCB) and both protecting and magnifying them with a one-piece lens.
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• 0.1”/2.54 mm Characters • Seven-Segment Digits with Right-Hand Decimals • Continuous Uniform Segments • Wide Viewing Angle • Common-Cathode Configuration for Multiplex Applications • 0.200”/5.08 mm Character Spacing • Integrated Clear Plastic Lens |
| Type | Products | Digits | Comments |
| DIS206C | TI-2550 Version 1, Display 2 |
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| Type | Products | Relationship | Comments |
| DIS206A | TI-2550 Version 1, Display 2 | Predecessor | Uses Bowmar Optostic |
| Item | Min | Typ | Max | Unit | Comments |
| Display Width |
2.50 63.5 |
inch mm |
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| Display Height |
1.02 26.0 |
inch mm |
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| Display Depth |
0.21 5.4 |
inch mm |
Including Printed Circuit Board | ||
| PCB Thickness |
0.03 0.8 |
inch mm |
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| Lens Width |
2.01 51.2 |
inch mm |
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| Lens Height |
0.54 10.7 |
inch mm |
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| Lens Depth |
0.18 4.6 |
inch mm |
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| Character height |
0.100 2.54 |
inch mm |
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| Character width |
0.070 1.78 |
inch mm |
w/o Decimal Point | ||
| Character slant angle |
10 | degrees | |||
| Character spacing |
0.200 5.08 |
inch mm |
The displays are formed by bonding monolithic GaAsP (Gallium Arsenide Phosphide) LED chips integrating either one character with seven Segment Bars or one Decimal Point, each directly to a double-sided FR4 printed circuit board (PCB) and placing a one-piece clear acrylic magnifying lens with cylindrical shaped surface on top of the assembly with four heat stakes.
The die size of the LED chip for the Segments is approximately 80 mils * 40 mils / 2.0 mm * 1.0 mm and for the Decimal Point approximately 20 mils * 20 mils / 0.5 mm * 0.5 mm, the magnification of the lens is about 1.7 at a viewing distance of 0.4" / 10 mm.
The DIS134C uses a 2.50" / 63.5 mm by 1.02” / 26.0 mm rectangular printed circuit board (PCB) with 19 solder tabs with a 0.1” / 2.54 mm pitch arranged on the bottom of the display module.
| Pin | Pol. | Function |
| 1 | A | G Segments |
| 2 | 2 | Digit 9 (Minus Sign) |
| 3 | A | F Segments |
| 4 | C | Digit 8 (MSD) |
| 5 | A | E Segments |
| 6 | C | Digit 7 |
| 7 | n.c. | |
| 8 | C | Digit 6 |
| 9 | A | Decimal Points |
| 10 | C | Digit 5 |
| 11 | A | D Segments |
| 12 | C | Digit 4 |
| 13 | n.c. | |
| 14 | C | Digit 3 |
| 15 | A | A Segments |
| 16 | C | Digit 2 |
| 17 | A | C Segments |
| 18 | C | Digit 1 (LSD) |
| 19 | A | B Segments |
| The Anode of the Segments A-G, Segment G (H) for minus sign of the Exponent and Right-Hand Decimals and the Cathode of the Digits 1-9 are connected to the display in the pictured way. |
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Note: The DIS206C Display module has Segment B, Segment C and Decimal Point (Segment DP) of the leftmost digit not bonded out.
If you have additions to the above datasheet please email: joerg@datamath.org.
© Joerg Woerner, December 25, 2024. No reprints
without written permission.