Touch Display Electrode Inclination for Matrix Scattering Reduction

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Solution Overview

Problem

Conventional touch display devices suffer from visual deteriorations such as double images and color-shift due to matrix scattering caused by the mismatched arrangement of display electrodes and touch-sensing electrodes, which affects image resolution and visibility.

Innovation Solution

The display and touch-sensing electrodes are inclined at the same angle in the same direction, with the display electrode having slits that are symmetrical about the pixel center and the touch-sensing electrode having slits that match the inclination of the display slits, ensuring that diffracted images from both electrodes coincide in direction, thereby offsetting matrix scattering.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If display electrodes and touch-sensing electrodes are arranged independently without considering their arrangement relationship, then each electrode can be optimized for its own function, but matrix scattering occurs due to mismatched diffraction patterns, causing visual deterioration

Engineering Contradiction:

ImproveIndependent electrode optimizationVSAvoidMatrix scattering and visual deterioration

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent merges the optimization of display electrodes and touch-sensing electrodes by establishing a coordinated arrangement relationship between them. The touch-sensing electrode arrangement is specifically designed to match the diffraction pattern of the display electrode, creating a unified optical performance optimization that prevents matrix scattering while maintaining independent functional optimization.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies local quality by adjusting the arrangement of touch-sensing electrodes in specific regions to match the local diffraction characteristics of display electrodes. The touch-sensing electrode pattern is locally optimized in each pixel area to correspond with the display electrode geometry, ensuring that diffraction patterns align locally to prevent matrix scattering.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If electrodes are arranged to prevent matrix scattering through coordinated diffraction patterns, then visual quality improves, but the design complexity increases due to the need to consider arrangement relationships between electrodes

Engineering Contradiction:

ImproveVisual quality and image visibilityVSAvoidElectrode arrangement design complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent employs asymmetry in the electrode arrangement design where the touch-sensing electrode pattern is deliberately designed to be asymmetric relative to the display electrode, specifically oriented at ±45 degrees to match the diffraction characteristics. This asymmetric arrangement optimizes the diffraction pattern alignment to prevent matrix scattering while providing a clear design guideline that manages complexity.

Inventive Principle:

Principle #4Asymmetry

3Ease of operation

If touch-sensing electrodes are arranged at different angles than display electrodes, then each electrode maintains its optimal orientation for sensing and display functions, but diffracted images from both electrodes diverge in different directions, causing double images and color-shift

Engineering Contradiction:

ImproveIndependent electrode function optimizationVSAvoidImage alignment and diffraction pattern consistency

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by adjusting the orientation angle parameter of the touch-sensing electrode arrangement to specifically ±45 degrees relative to the display electrode. This parameter optimization ensures that the diffraction patterns of both electrodes align in the same direction, preventing double images and color-shift while maintaining the functional optimization of both electrode types.

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

This configuration prevents visual deteriorations like double images and color-shift, improving image visibility by aligning the scattering patterns of display and touch-sensing electrodes, resulting in enhanced resolution and clarity.

Implementation Method 1

a plurality of diffracted images may be generated by the display electrodes depending on the wavelength of the light that is emitted from a backlight unit and passes through the display electrodes

Methodology Applied

Scientific EffectDiffraction: Diffraction

Implementation Method 2

which may cause constructive interference

Methodology Applied

Scientific EffectInterference: Interference

Data Source

PatentUS10613658B2Touch display device with reduced matrix scattering

Publication Date: 2020.04.07 LG DISPLAY CO LTD

AI summary

Disclosed is a touch display device capable of improving resolution and visibility. The touch display device is configured such that a display electrode in a display panel and a touch-sensing electrode located on a top of the display panel are inclined at the same angle in the same direction.