Display Device Pixel Segmentation for Color Reproduction

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Solution Overview

Problem

Current display devices face challenges in enhancing light output efficiency, particularly in achieving balanced color reproduction and efficient light emission across different pixel areas.

Innovation Solution

The display device incorporates a substrate with multiple emission areas, each containing light emitting elements, a color filter layer, and storage capacitors, along with a light blocking pattern and insulating layers, to optimize light emission and distribution, and includes a color conversion layer to adjust light colors emitted from the light emitting elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If multiple emission areas with different color filter patterns are arranged in a pixel, then color reproduction is improved, but device complexity increases due to multiple storage capacitors and transistors

Engineering Contradiction:

Improvecolor reproductionVSAvoidpixel structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The pixel is divided into multiple emission areas (first, second, and third emission areas), each corresponding to different color filter patterns (red, green, blue). This segmentation allows independent control and optimization of each color channel, improving overall color reproduction while managing complexity through modular design

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each emission area is equipped with its own storage capacitor and transistor, allowing localized control and optimization of electrical characteristics for each color. This ensures that each color filter pattern receives appropriate drive signals and maintains proper charge storage, enhancing color accuracy without requiring complete redesign of the entire pixel structure

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If light blocking pattern is added between emission areas, then color purity is improved, but light output efficiency decreases

Engineering Contradiction:

Improvecolor purityVSAvoidlight output efficiency

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The light blocking pattern is strategically positioned only in the areas between emission areas where color mixing would occur, rather than covering entire pixel regions. This localized approach maintains color purity by preventing cross-contamination of light from different color filters while preserving maximum light output from each emission area

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The light blocking pattern acts as an intermediary element that selectively blocks light paths between different emission areas without interfering with the primary light emission from each area. This mediator structure ensures color isolation while minimizing impact on overall light output efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If multiple storage capacitors are provided for different color filter patterns, then color accuracy is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvecolor accuracyVSAvoidfabrication process

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The pixel structure is segmented into multiple independent units, each with its own storage capacitor and transistor. This modular segmentation allows for standardized fabrication processes that can be replicated across different color channels, improving color accuracy through consistent manufacturing while managing complexity through repetition of proven design blocks

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each storage capacitor is specifically designed and positioned to match the electrical characteristics and timing requirements of its corresponding color filter pattern. By optimizing parameters such as capacitor size, position, and electrical characteristics for each color channel, the patent achieves high color accuracy while maintaining manufacturability through parameter optimization rather than structural complexity

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 improves light output efficiency and color reproduction by ensuring balanced light emission across different pixel areas, enhancing the overall display performance.

Implementation Method 1

a color filter layer including a first color filter pattern on the first emission area, a second color filter pattern on the second emission area, and a third color filter pattern on the third emission area

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Data Source

PatentUS11550087B2Display device

Publication Date: 2023.01.10 SAMSUNG DISPLAY CO LTD

AI summary

The display device may include a substrate; at least one pixel along a first direction on the substrate and including first, second, and third emission areas, in each of which a plurality of light emitting elements are provided; a light blocking pattern corresponding to an area between the first to third emission areas; and a color filter layer including a first color filter pattern provided on the first emission area, a second color filter pattern provided on the second emission area, and a third color filter pattern provided on the third emission area. Here, the pixel may include a first storage capacitor, a second storage capacitor, and a third storage capacitor on the substrate and corresponding to one of the first to third color filter patterns.