Showing posts with label Three-Five Systems. Show all posts
Showing posts with label Three-Five Systems. Show all posts

Wednesday, August 10, 1994

De Dietrich LED Control Panel

Another display module design that I put together was for the French company De Dietrich, who  manufacture high end cooking equipment, and this module was intended for an oven.  The module required an LED display with custom icons, two switches and a rotary switch encoder.

The completed module

This module comprised two designs, the LED display module and the main board it was mounted to.  The LED module consists a printed circuit board and custom plastic molding.  The custom molding includes a flame icon and a celsius symbol.

The icon is top right of the module

As with other Three-Five designs, the LED controller die was bonded directly to the custom LED PCB.  Three-Five Systems had extensive experience with wire bonding, as all LED displays require wire bonding.

Sadly I cannot find a picture of the display in the final unit, so if anyone has one, please feel free to send me a copy. 

Sunday, August 9, 1992

Lenze Industrial Inverter Display Panel

This was one of my first LCD designs.  Again I was responsible for the electrical, PCB, LCD and mechanical designs. This was a custom LCD display that was to fit into a plastic molding.  The LCD was a separate custom design that I put together including the metal bezel.

Custom LCD module on the main assembly

The electrical design for this was a little more complex.  Back in the 90s the LCD was driven but both X and Y drivers, mounted in die form under the LCD PCB.  The LCD itself was a custom design completed on AutoCad and manufactured by Three-Five Systems.

Completed Assembly

The remaining electrical design was conventional surface mount tech, as can be seen in the photos of the completed unit.  Some push buttons and LEDs completed the design.

The Complete Unit in situ

And this is what it looks like in the finished unit.  The module was designed for a number of different units, this is just one of the 

Friday, August 9, 1991

Custom LED Dot Matrix Display

This project was a stackable LED dot matrix display.  I don't have the drawings for this any more but this would have been about 25mm x 100mm (or 1"x4" for my American friends).  For this design I was again responsible for the electrical design, PCB layout and plastic molding design.

The Display Module

In order to make this stack correctly, the plastic molding had indents and protrusions to ensure alignment.  The photo below shows this detail.

This shows the location lugs

The electrical and PCB design featured a bank switched LED array, driven by a National 5450 LED driver, with the die directly mounted to the PCB (the black blob shown below) so part of the PCB design included the die layout and bonding diagram for the die placement. 
 
LED driver on the board

I believe this was in red but as for the purpose of the display, that is lost in the mists of time.

Monday, August 6, 1990

ABB Industrial Controller Display Panel

I worked at Three Five Systems for five years.  I was the only engineer in the UK office and in my time there I did the electronic design, PCB layout and the plastic molding design.

This assembly is the front panel for an industrial controller.  It consisted of 6 dual digit displays (14 segments), and a bar graph module. Both of these modules are custom assemblies, so I had three PCBs and two plastic moldings to design.

the complete assembly

The electronics to drive all of this consist of discrete transistors for bank switching, National 5450s for the LED driving, (remember this was the early 90s) and a couple of voltage regulators.

The PCB back side

I used PCAD to perform the PCB layout, and AutoCad for the plastic moldings.  However, to create these modules, Three-Five would use the silicon die and wire bond directly to the board. In the picture above, the black blobs are where the die is located.

The completed Module

I can't find a decent picture of the completed module, but here is a watermarked picture of the module.