Modular Braille Dot-Matrix Display for Fast Refresh and Low Power

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Solution Overview

Problem

Existing dot-matrix tactile display terminals for the visually impaired face issues such as low refresh rate, small support forces, large dot pitch, high energy consumption, and inconvenience in carrying, failing to meet the needs of visually impaired individuals for barrier-free access to information.

Innovation Solution

A Braille module and dot-matrix tactile display terminal featuring a modular design with eight-dot array Braille dots, magnetic conductive plates, and a mechanical structure that includes a touch pad module, Braille dot driver modules, and a needle stand connector module, allowing for high response speed, large support force, and low power consumption, with a modularized design for expandability and maintainability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a phase change material type dot-matrix tactile display terminal is used, then the display can be compact, but the driving voltage is high and response time is long

Engineering Contradiction:

Improvedisplay sizeVSAvoidresponse time

Core Design Contradiction:

Volume of moving objectVSSpeed

Solution Approach 1:

The patent replaces phase change material mechanisms with an electromagnetic driving system consisting of a permanent magnet, coil, and iron core. This substitution enables faster response times through electromagnetic actuation while maintaining compact form factor, directly resolving the contradiction between small size and slow response.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Length of moving object

If SMA micro coil driver with permanent magnet self-locking structure is used, then the dot pitch can be reduced, but the refresh rate is low

Engineering Contradiction:

Improvedot pitchVSAvoidrefresh rate

Core Design Contradiction:

Length of moving objectVSProductivity

Solution Approach 1:

The patent implements a dynamic electromagnetic driving system where the coil can rapidly switch magnetic field states to drive the permanent magnet back and forth. This dynamic operation enables high refresh rates while the precise positioning of the iron core and permanent magnet maintains small dot pitch, resolving the contradiction between compact dot spacing and fast refresh capability.

Inventive Principle:

Principle #15Dynamics

3Length of moving object

If pneumatic type tactile display terminal is used, then the dot pitch can be small, but the energy consumption is high and portability is poor

Engineering Contradiction:

Improvedot pitchVSAvoidenergy consumption

Core Design Contradiction:

Length of moving objectVSUse of energy by moving object

Solution Approach 1:

The patent replaces the pneumatic system with an electromagnetic system using a coil and permanent magnet. This substitution dramatically reduces energy consumption by eliminating the need for continuous air pressure generation and delivery infrastructure, while maintaining small dot pitch through precise electromagnetic actuation of the driving needle.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Ease of operation

If electromagnetic tactile display terminal with large size is used, then the Braille dots can be displayed, but the support forces are small and dot pitch is large

Engineering Contradiction:

ImproveBraille display capabilityVSAvoidsupport force

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The patent optimizes several parameters: uses strong permanent magnet material (NdFeB), increases coil turns (80-120 turns), reduces air gap distance, and selects appropriate iron core geometry. These parameter changes collectively enhance the magnetic force to provide sufficient support force for Braille dots while maintaining compact size and small dot pitch.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution provides high refresh rates, low energy consumption, and convenience in carrying, enabling visually impaired individuals to access information dynamically and efficiently, with a wide range of applications including single-row, multi-row, and two-dimensional touch image displays.

Implementation Method 1

the coil and the upper iron core generate a magnetic field in a forward direction and a reverse direction to drive the permanent magnet to move up and down

Methodology Applied

Scientific EffectElectromagnetic interaction: Lorentz Force

Implementation Method 2

the magnetic conductive plates are arranged in three grooved magnetic conductive plate grooves of the enclosure panel and are made from an iron base amorphous alloy

Methodology Applied

Scientific EffectMagnetic conduction: Ferromagnetism

Data Source

PatentUS12518652B2Braille module and dot-matrix tactile display terminal

Publication Date: 2026.01.06 HANGZHOU INTERACTIVE PERCEPTION TECHNOLOGY CO LTD

AI summary

The present application discloses a Braille module and a dot-matrix tactile display terminal, and the application relates to the technical field of tactile display. The Braille module includes a touch pad module, Braille dot driver modules, magnetic conductive plates, an enclosure panel, a bottom plate, a bottom plate accessory and a needle stand connector module. The touch pad module is provided with eight-dot array Braille dots. By adopting a modularized design scheme, the dot-matrix tactile display terminal of the present application has a wide range applications and has the technical advantages in assemblability, maintainability and processability, which are beneficial in manufacturing various types of Braille dot displays and two-dimensional touch image display devices with relatively low costs.