Electro-Optical Device Light Emission Region Geometry

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Solution Overview

Problem

Existing electro-optical devices with light-emitting elements, such as organic electroluminescence (EL) elements, face challenges in achieving sufficient visual field angle characteristics due to variations in shape and area of light-emitting regions between sub-pixels, leading to color changes and inadequate light distribution.

Innovation Solution

The electro-optical device incorporates first and second light-emitting elements with corresponding filters that transmit light in specific wavelength regions, where the length of the filters exceeds the length of the light-emitting regions, ensuring a relationship that reduces color changes and enhances visual field angle by balancing light intensity across different observation directions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the light-emitting regions of light-emitting elements between adjacent sub-pixels have different shapes and areas, then the device complexity is reduced and manufacturing is simplified, but the visual field angle characteristics deteriorate and color changes occur

Engineering Contradiction:

Improvestructure complexityVSAvoidvisual field angle characteristics

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies local quality by introducing a black matrix only in specific regions where needed to compensate for light leakage, rather than uniformly across the entire display. This selective application maintains visual field angle characteristics in critical areas while keeping the overall structure simple and manufacturing feasible.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs asymmetry by strategically positioning black matrices of different sizes and shapes at different locations based on the specific light emission characteristics of each sub-pixel. This asymmetric arrangement compensates for variations in light-emitting region shapes and areas, preventing color changes while maintaining manufacturing simplicity.

Inventive Principle:

Principle #4Asymmetry

2Adaptability or versatility

If the light-emitting regions of light-emitting elements between adjacent sub-pixels have different light distribution characteristics, then the device design flexibility is improved, but the visual field angle characteristics deteriorate

Engineering Contradiction:

Improvedesign flexibilityVSAvoidvisual field angle characteristics

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies parameter changes by adjusting the size, shape, and position of black matrices to compensate for variations in light distribution characteristics. By changing these geometric parameters locally, the patent maintains consistent visual field angle characteristics across different sub-pixels while preserving design flexibility for different light-emitting region configurations.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If filters are added to transmit light in specific wavelength regions, then color purity is improved, but the device complexity increases and manufacturing difficulty increases

Engineering Contradiction:

Improvecolor purityVSAvoidfilter structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent merges the function of the black matrix with the color filter by integrating the black matrix into the color filter layer structure. This combination achieves both color purification and light leakage prevention in a single integrated component, reducing overall device complexity while maintaining manufacturing precision for color purity.

Inventive Principle:

Principle #5Merging (Combining)

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 improves the visual field angle and reduces color changes due to observation direction, resulting in a more balanced and stable light distribution across the display, surpassing the limitations of known art.

Implementation Method 1

a first filter configured to transmit, of the first light, light in a first wavelength region, and a second filter configured to transmit, of the second light, light in a second wavelength region different from the first wavelength region

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Data Source

PatentUS11641771B2Electro-optical device and electronic apparatus

Publication Date: 2023.05.02 SHIHENG CREATION LTD

AI summary

An electro-optical device includes a first light-emitting element including a first light-emitting region, a second light-emitting element including a second light-emitting region, a first filter, and a second filter. The area of the first light-emitting region is smaller than the area of the second light-emitting region, and a relationship (Lf11−Le11)>(Lf21−Le21) is satisfied when the length of the first light-emitting region is Le11, the length of the second light-emitting region is Le21, the length of the first filter is Lf11, and the length of the second filter is Lf21.