Sensing Electrode Shielding for Display Wavelength Variation

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Solution Overview

Problem

Display devices suffer from variations in wavelength that cause images to appear differently when viewed from various angles, leading to reduced display quality due to optical phenomena like resonance and interference.

Innovation Solution

A display device design featuring a base layer, pixel definition layer, and a sensing electrode that partially shields color light emitting areas, with specific opening shapes and sizes to minimize interference and maintain consistent color perception across viewing angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If a sensing electrode is disposed on the display device to enable input sensing functionality, then input sensing capability is improved, but wavelength variation and display quality deteriorate due to optical interference

Engineering Contradiction:

Improveinput sensing capabilityVSAvoiddisplay quality

Core Design Contradiction:

Extent of automationVSReliability

Solution Approach 1:

The sensing electrode is divided into multiple separate sensing electrode patterns (first, second, third sensing electrode patterns) corresponding to different color light emitting areas. This segmentation allows independent optimization of each sensing region's optical characteristics while maintaining input sensing functionality across the entire display area.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each sensing electrode pattern is designed with specific local characteristics including different opening sizes, shapes, and positions tailored to correspond with specific color light emitting areas. The openings in each sensing electrode pattern have different dimensions (first openings, second openings, third openings) to locally optimize light transmission and reduce wavelength variation for each color region.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If the sensing electrode covers the entire display area for comprehensive input detection, then input sensing accuracy is improved, but wavelength variation increases causing color perception differences

Engineering Contradiction:

Improveinput sensing accuracyVSAvoidwavelength consistency

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The sensing electrode is segmented into multiple distinct patterns positioned over different color light emitting areas. This segmentation enables comprehensive input detection across the entire display while allowing each segment to be optimized for its specific color region, thereby maintaining wavelength consistency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each sensing electrode pattern has locally optimized characteristics including specific opening sizes and shapes matched to the underlying color light emitting area. This local optimization ensures that each region maintains appropriate light transmission properties, preventing wavelength variation while achieving comprehensive sensing coverage.

Inventive Principle:

Principle #3Local quality

3Illumination intensity

If openings in the sensing electrode are made larger to improve light transmission, then luminance is improved, but the shielding effect for wavelength control is reduced

Engineering Contradiction:

ImproveluminanceVSAvoidwavelength control

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

Each sensing electrode pattern has openings with locally optimized sizes and shapes that correspond to the specific color light emitting area beneath it. This local optimization allows each opening to provide appropriate luminance transmission while maintaining the shielding effect necessary for wavelength control in its specific region.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The opening parameters (size, shape, position) of each sensing electrode pattern are specifically adjusted to achieve the optimal balance between luminance transmission and wavelength control. By changing these parameters locally for each color region, the system achieves both high luminance and effective wavelength management.

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 reduces the variation in wavelength of white images, enhancing display quality by minimizing luminance differences across different viewing angles and maintaining consistent color impressions.

Implementation Method 1

a light generated from a light emitting device of the display device may be emitted to outside of the display device (outside of the electronic device) while generating various optical phenomena such as resonance and interference

Methodology Applied

Scientific EffectOptical interference: Interference

Implementation Method 2

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentEP4284145A1Display device

Publication Date: 2023.11.29 SAMSUNG DISPLAY CO LTD

Figure 1~2
Figure 3A
Figure 3B

AI summary

A display device includes an input sensing electrode. A sensing electrode partially shields a first color light emitting area and a second color light emitting area or partially shields a third color light emitting area when the first color light emitting area, the second color light emitting area, and the third color light emitting area are viewed from a first point having a first viewing angle with respect to a normal line of a base layer of the display device.