Color Filter Pattern Sizing for Flexible Display Light Reflectance

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Solution Overview

Problem

Flexible organic light emitting displays face challenges with external light reflectance due to the size mismatch between color filter patterns and light emitting elements, which affects image quality and brightness.

Innovation Solution

The display device incorporates a color conversion layer with varying size color filter patterns corresponding to light emitting elements, including a black matrix that adjusts its size relative to the elements to minimize external light reflectance, with specific designs for each color filter pattern to optimize light absorption and transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the color filter pattern size is made smaller than the light emitting element size, then the manufacturing precision is improved and the structure is simplified, but the external light reflectance increases and image quality deteriorates

Engineering Contradiction:

Improvecolor filter pattern size controlVSAvoidexternal light reflectance

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies different size relationships between color filter patterns and light emitting elements for different color sub-pixels. Specifically, red and green sub-pixels have color filter patterns smaller than their light emitting elements, while blue sub-pixels have color filter patterns equal to or larger than their light emitting elements. This local differentiation optimizes the balance between manufacturing precision and external light reflectance for each color channel.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the color filter pattern size is made larger than the light emitting element size, then the external light reflectance is reduced and image quality is improved, but the device complexity increases

Engineering Contradiction:

Improveexternal light reflectanceVSAvoidcolor filter pattern configuration

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent implements local quality by assigning different color filter pattern sizes to different color sub-pixels based on their specific optical characteristics. Red and green sub-pixels use smaller color filter patterns, while blue sub-pixels use larger or equal-sized patterns, thereby reducing overall device complexity while effectively minimizing external light reflectance.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If uniform color filter pattern sizes are used for all light emitting elements, then the manufacturing process is simplified, but the brightness and image quality are compromised due to increased external light reflectance

Engineering Contradiction:

Improvecolor filter pattern fabricationVSAvoiddisplay brightness

Core Design Contradiction:

Ease of manufactureVSIllumination intensity

Solution Approach 1:

The patent employs local quality by differentiating color filter pattern sizes across different color sub-pixels. This approach maintains relatively simple manufacturing processes while significantly improving display brightness and image quality by reducing external light reflectance through optimized local configurations.

Inventive Principle:

Principle #3Local quality

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 reduces external light reflectance, enhancing image quality and brightness by optimizing the size and placement of color filter patterns and the black matrix relative to the light emitting elements.

Implementation Method 1

a color conversion layer having color filter patterns corresponding to respective light emitting elements

Methodology Applied

Scientific EffectLight absorption and transmission: Absorption (EM radiation)

Implementation Method 2

The plurality of pixels includes first, second and third sub-pixels each having a light emitting region... a first color filter pattern corresponding to a red color, a second color filter pattern corresponding to a green color, and a third color filter pattern corresponding to a blue color

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Implementation Method 3

a black matrix disposed between the color filter patterns... minimize external light reflectance

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS10475857B2Display device color filter patterns and a black matrix

Publication Date: 2019.11.12 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a first substrate including a pixel region and a peripheral region at least partially surrounding the pixel region and a plurality of pixels disposed in the pixel region. The plurality of pixels includes first, second and third sub-pixels each having a light emitting region. The display device further includes light emitting elements respectively disposed in the light emitting regions of the first to third sub-pixels and a color conversion layer having color filter patterns corresponding to respective light emitting elements. At least one of the color filter patterns has a size smaller than that of the light emitting elements in a first direction of the first substrate, and the rest of the color filter patterns has a size larger than that of the light emitting elements in the first direction of the first substrate.