Rotating Laser Pointer for Accurate Screen Positioning

Solution Overview

Problem

Existing finger touch technologies for LCD and OLED displays require additional layers of photovoltaic sensors for accurate positioning, increasing costs and complexity, and struggle with positioning accuracy when the interactive device is outside the screen or moving.

Innovation Solution

An interactive device with a rotating light-emitting component and a photovoltaic sensor on opposite sides of an inductive screen, which calculates a directing point by determining straight-line equations from sampling points, allowing for reduced sensor count and lower costs while maintaining accurate positioning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If additional layers of photovoltaic sensors are used for accurate positioning, then positioning accuracy is improved, but manufacturing cost and device complexity increase

Engineering Contradiction:

Improvepositioning accuracyVSAvoidsensor layer complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the positioning function from the display layer itself and relocates it to the interaction between the laser pointer and screen surface. Instead of embedding sensors throughout the display structure, only edge sensors are needed to detect the laser spot position, thereby reducing overall sensor complexity while maintaining positioning accuracy

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a laser beam as an intermediary element between the user's hand and the screen positioning system. The laser spot serves as a visible mediator that bridges the gap between the pointer and screen, enabling accurate positioning detection with minimal sensors by tracking the laser spot's position on the screen surface

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If photovoltaic sensors are used for positioning, then positioning capability is achieved, but cost increases

Engineering Contradiction:

Improvepositioning capabilityVSAvoidproduction cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent extracts the positioning function from the display layer itself and relocates it to the interaction between the laser pointer and screen surface. Instead of embedding sensors throughout the display structure, only edge sensors are needed to detect the laser spot position, thereby reducing overall sensor complexity while maintaining positioning accuracy

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses the laser spot as an optical copy or representation of the pointer's position on the screen. By detecting the position of this light copy rather than requiring direct physical contact sensors, the system achieves positioning capability with fewer, less expensive photovoltaic sensors

Inventive Principle:

Principle #26Copying

3Ease of operation

If traditional touch sensors are embedded into display substrates, then direct interaction is achieved, but device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improvedirect interactionVSAvoidsensor embedding complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent extracts the positioning function from the display layer itself and relocates it to the interaction between the laser pointer and screen surface. Instead of embedding sensors throughout the display structure, only edge sensors are needed to detect the laser spot position, thereby reducing overall sensor complexity while maintaining positioning accuracy

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical embedding of touch sensors into the display substrate with an optical system. Instead of physical sensor contact, the laser spot's optical position is detected by photovoltaic sensors at the screen edges, substituting mechanical integration with optical detection to reduce device complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

This solution reduces the number of photovoltaic sensors needed, lowering production costs and maintaining accurate positioning and interaction capabilities, even when the interactive device is outside the screen or moving, by using a rotating light beam to determine the directing point on the inductive screen.

Implementation Method 1

a photovoltaic sensor arranged on two opposite sides of the inductive screen. The photovoltaic sensor is configured to sense a linear light beam emitted from the interactive device

Methodology Applied

Scientific EffectPhotovoltaic effect: Photovoltaic Effect

Data Source

PatentUS11537223B2Interactive device, sensing screen, interactive system, and positioning method

Publication Date: 2022.12.27 BEIJING BOE TECH DEV CO LTD

AI summary

The present disclosure provides an interactive device, an inductive screen, an interactive system, and a positioning method, and relates to the field of display technologies, with an objective of providing a low-cost positioning and interactive method. The interactive device includes: a first housing, a first end of the first housing having a light-exit opening; a first light-emitting component, arranged inside the first housing and configured to emit a linear light beam through the light-exit opening of the first housing, the linear light beam rotating with rotation of the first housing; and a driving component, connected to a second end of the first housing opposite to the first end and configured to drive the first housing to rotate.