How Black and White Squares Changed the World
It Started with a Barcode Complaint
In the early 1990s, a Denso factory in Aichi, Japan used barcodes for auto parts management. But barcodes held too little data - workers had to scan multiple labels per part, hundreds of times daily. A simple question sparked the invention: could one scan capture more information? The project was assigned to engineer Masahiro Hara and a team of just two people.
Inspired by a Go Board
The team decided to encode data in two dimensions instead of one. The breakthrough came during a lunch break Go game - the black and white stones on the grid inspired the pattern design. Three large square markers in the corners enabled instant position detection from any angle.
Completed in 18 Months, Then the Biggest Decision
The 2D code was completed in 1994 - 350 times the data capacity of barcodes, 10x faster reading, and damage-resistant. But the crucial decision came next: Denso Wave patented the technology, then declared it would not enforce the patent. Anyone could use it for free. This decision made it a global standard.
From Japanese Factory to Global Smartphones
The pattern spread from auto factories to logistics, healthcare, and food management. The turning point was 2002 when Japanese phones got cameras. In 2017, Apple added native scanning to iPhone's camera. During COVID-19 in 2020, it became social infrastructure for contactless menus and vaccine certificates.
The Inventor Says 'No Regrets'
Masahiro Hara has stated he has no regrets about the free patent decision. Competing 2D codes with patent restrictions saw limited adoption. In 2014, Hara received the European Inventor Award - the first Japanese recipient. The committee praised the free patent decision as the key to global standardization.