# How Smartphones Use Flashing Barcodes for Secure Ticketing

> A system for mobile devices to display a series of flashing barcodes that a scanner reads, ensuring tickets are only used during specific valid time windows.

- **Patent:** US RE45784
- **Original title:** USRE45784E1 - OFDM signal transmission system, portable terminal and E-commerce system
- **Owner:** Panasonic Intellectual Property Management Co Ltd
- **Granted:** 2015
- **Status:** Active
- **Times cited:** 0
- **Field:** consumer_electronics, software, ecommerce, telecommunications

## What it does

This patent describes a way for a smartphone to turn digital data into a sequence of barcodes that appear on the screen one after another. The phone includes a detector that senses light or signals from an external barcode reader, which tells the phone exactly when to switch to the next barcode in the sequence. This ensures the reader captures all parts of a large data set, like a complex ticket, even if the screen is small. The system also includes a backend server that checks if a ticket is being scanned at the correct time, preventing unauthorized entry if the reservation window has passed.

## What it does NOT cover

- Does not cover static, single-frame barcodes that do not change based on reader feedback.
- Does not cover systems that rely on GPS or location services to validate ticket entry.
- Does not cover NFC or Bluetooth-based contactless ticketing methods.
- Does not cover the internal hardware design of the barcode scanner itself.

## The clever bit

The phone acts as a two-way communicator; it doesn't just show a code, it waits for the scanner to 'signal' that it has successfully read the current frame before advancing to the next one.

## Real-world examples

1. Digital concert ticketing apps
2. Mobile boarding pass systems
3. Automated event entry kiosks

## Why it matters

This technology addresses the limitations of early smartphone screens, which often struggled to display high-density barcodes clearly. By breaking data into a sequence of flashing codes, it allowed for more secure and detailed digital ticketing. It highlights the transition from paper tickets to dynamic, time-sensitive digital credentials in e-commerce.

## Frequently asked questions

### What does How Smartphones Use Flashing Barcodes for Secure Ticketing cover?

A system for mobile devices to display a series of flashing barcodes that a scanner reads, ensuring tickets are only used during specific valid time windows.

### Who owns patent US RE45784?

Panasonic Intellectual Property Management Co Ltd owns this patent, granted in 2015.

### When does this patent expire?

This patent is expected to expire on October 27, 2035, when the invention enters the public domain.

### What problem does this patent solve?

This technology addresses the limitations of early smartphone screens, which often struggled to display high-density barcodes clearly. By breaking data into a sequence of flashing codes, it allowed for more secure and detailed digital ticketing. It highlights the transition from paper tickets to dynamic, time-sensitive digital credentials in e-commerce.

### What does this patent NOT cover?

Does not cover static, single-frame barcodes that do not change based on reader feedback.

**Full plain-English explainer:** https://patentbrief.org/patent/us/RE45784/multi-room-wireless-audio

**Original patent:** https://patents.google.com/patent/USRE45784

---

_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._