Single-Substrate Polarizer Touch Sensor Integration for Thinner Displays

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Solution Overview

Problem

Conventional touch screen displays require separate substrates for polarizers and touch sensors, leading to increased material usage, weight, and optical attenuation, while projected capacitive touch sensors face design limitations that affect panel luminance and mechanical performance.

Innovation Solution

Integrating touch sensor circuitry directly onto a polarizer substrate during manufacturing, eliminating the need for separate substrates and adhesives, and allowing for thinner, lighter, and more optically efficient displays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If separate substrates are used for polarizer and touch sensor, then manufacturing flexibility is maintained, but device complexity and material usage increase

Engineering Contradiction:

Improvemanufacturing flexibilityVSAvoidnumber of substrates

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent combines the polarizer substrate and touch sensor into a single integrated substrate. The touch sensor circuitry is directly formed on the polarizer substrate, eliminating the need for separate substrates and reducing overall device complexity while maintaining manufacturing feasibility through direct formation processes

Inventive Principle:

Principle #5Merging (Combining)

2Stability of the object's composition

If separate substrates and adhesives are used, then structural integrity is maintained, but weight and material usage increase

Engineering Contradiction:

Improvestructural integrityVSAvoiddisplay weight

Core Design Contradiction:

Stability of the object's compositionVSWeight of moving object

Solution Approach 1:

By merging the polarizer substrate and touch sensor into a single substrate, the patent eliminates multiple adhesive layers and separate components, thereby reducing weight while maintaining structural integrity through the integrated design

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If multiple substrates and adhesives are used, then assembly flexibility is maintained, but optical transmission is attenuated

Engineering Contradiction:

Improveassembly flexibilityVSAvoidpanel luminance

Core Design Contradiction:

Ease of manufactureVSIllumination intensity

Solution Approach 1:

The patent merges the polarizer and touch sensor into a single substrate, eliminating multiple adhesive interfaces that would otherwise attenuate optical transmission. This integration reduces the number of optical paths and interfaces, thereby improving panel luminance and optical transmission

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If low resistance traces are used for PCAP touch sensors, then touch performance is improved, but minimum trace widths are reduced causing optical artifacts

Engineering Contradiction:

Improvetouch performanceVSAvoidpanel luminance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent changes the resistance parameter of the touch sensor traces to high resistance values, which allows for wider trace widths that do not cause optical artifacts while maintaining adequate touch sensor functionality through the high-impedance capacitive sensing mechanism

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12372826B2Single substrate polarizer and touch sensor for display screens

Publication Date: 2025.07.29 DELL PROD LP

AI summary

Methods, apparatus and systems are provided for touch screen displays that utilize a polarizer and a touch sensor circuit that are manufactured on a single substrate, and in which the touch sensor circuitry may be directly printed onto a polarizer substrate to provide a combination of a polarizer and a touch sensor on the same single common substrate.