Touch Input Device Viewpoint Coordinate Correction

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Solution Overview

Problem

In display devices with touch detection functions, the deviation between the expected finger position on the display surface and the detected touch point can cause discomfort and hinder accurate operations, especially when the touch surface and display surface do not coincide in depth or when the touch surface is curved, and protective layers or space layers are present.

Innovation Solution

An information input device that includes a display device, a touch detection device, a detector to determine the operator's viewpoint, and a corrector that adjusts touch coordinates based on distance information stored in a storage device, ensuring accurate alignment between the expected and detected touch points.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the touch surface and display surface are separated in depth or the touch surface is curved, then protective layers or space layers can be provided for protection and heat radiation, but the deviation between the expected finger position on the display surface and the detected touch point increases

Engineering Contradiction:

Improveprotective layerVSAvoidtouch point detection accuracy

Core Design Contradiction:

StrengthVSMeasurement precision

Solution Approach 1:

The patent replaces the mechanical/optical alignment system with a computational coordinate correction system. Instead of physically aligning the touch surface with the display surface, the system uses a correction table to mathematically adjust touch coordinates based on the operator's viewpoint, eliminating the need for precise physical alignment while maintaining input accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the parameter space by introducing viewpoint-based coordinate correction. The system stores and uses multiple sets of correction values corresponding to different viewpoints, dynamically selecting and applying the appropriate correction based on where the operator is positioned, thereby compensating for the physical separation between surfaces.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the touch surface and display surface do not coincide in depth, then protective layers can be provided, but operator discomfort and stress increase due to deviation between expected and detected touch positions

Engineering Contradiction:

Improvedevice structure flexibilityVSAvoidoperator comfort

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The patent replaces mechanical alignment with computational correction. By using a correction table that stores offset values for different viewpoints, the system eliminates the need for precise physical alignment between touch and display surfaces, allowing manufacturing flexibility while maintaining operational comfort through software-based coordinate adjustment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The correction table acts as an intermediary between the touch detection device and the display device. It mediates the coordinate transformation by storing pre-calculated offset values that account for the physical separation and curvature, translating touch coordinates from the touch surface reference frame to the display surface reference frame.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If various devices with different thicknesses are used as touch panels, then device versatility is improved, but the distance between the touch sensor panel and display screen varies, causing touch coordinate deviation

Engineering Contradiction:

Improvetouch panel compatibilityVSAvoidtouch coordinate accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent creates a universal coordinate correction system that works with various touch panel types and thicknesses. The correction table stores viewpoint-based offset values that can accommodate different device configurations, making the system adaptable to multiple touch panel implementations while maintaining consistent touch accuracy across all variants.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses parameter changes by storing multiple sets of correction values in the correction table, each corresponding to different viewpoints and device configurations. The system dynamically selects and applies the appropriate correction parameters based on the operator's position and the specific device configuration, thereby maintaining accuracy across diverse hardware variations.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3663897B1Information input device

Publication Date: 2023.11.01 RENESAS ELECTRONICS CORP

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AI summary

An object of the present invention is to provide an information input device capable of realizing high-precision touch operations. The information input device includes a first surface for displaying input request information, a second surface for inputting input request information, a viewpoint calculator for calculating a viewpoint direction of an input person, and a coordinate corrector for correcting a position input to the second surface into a second position in response to the viewpoint direction of the input person and inputs the input request information on the first surface corresponding to the second position. The information input device further provides a storage device for holding distance information on distance between the first surface and the second surface.