One of the greatest values an engineering partner brings is helping customers interpret technical specifications correctly before design decisions are made.

Recently, during a custom touchscreen display project, a customer asked us about the backlight specification.

The datasheet stated:

VF = 30V (±2V) IF = 80mA (Typ.)

The customer wanted to confirm whether 80mA referred to each individual LED. Since the backlight contains 40 LEDs, the calculated total current would have been 3.2A, which would significantly influence the selection of the LED driver and power supply.

After reviewing the backlight architecture, we clarified that the LEDs were configured as 10 series × 4 parallel.

Forward current per LED: 20mA
Four parallel strings × 20mA
Actual backlight current: 80mA

The difference between 80mA and 3.2A is a factor of 40.

That single clarification can completely change:

• LED driver selection • Power supply sizing • PCB layout considerations • Thermal design • Component cost • Overall system design

This is why engineering support extends far beyond manufacturing.

A custom touchscreen display consists of hundreds of design decisions, including the LCD, backlight, touch sensor, cover glass, optical bonding, adhesives, firmware, interfaces, mechanical tolerances and environmental requirements.

Each decision affects the final product’s performance, reliability and manufacturability.

The right engineering partner does more than build to a drawing.

They review specifications, ask technical questions, verify assumptions and identify potential issues before they become costly redesigns.

Sometimes, the greatest value is not in making the product.

It is in preventing a problem before it exists.