OLED Color Filter Thickness Layout for RGB Light Balance

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Solution Overview

Problem

Existing OLED display technologies face issues with color cast and increased reflectivity due to unequal luminous efficiencies and light intensities of RGB pixels, leading to poor user experience in dark-state scenes.

Innovation Solution

A display panel with a color light filtering layer featuring light filtering structures of varying thicknesses, where the surfaces of these structures are in the same plane, and their thicknesses are correlated with the luminous efficiencies of corresponding light emitting regions to balance light intensities and reduce reflectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a conventional color filter with uniform thickness is used, then the structure is simple and easy to manufacture, but the light intensities of different color channels are unbalanced due to unequal luminous efficiencies of organic luminescent materials

Engineering Contradiction:

Improvelight intensity balanceVSAvoidcolor filter structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The color filter is designed with non-uniform thickness where different regions correspond to different color channels (red, green, blue) have different thicknesses. This local variation in thickness compensates for the unequal luminous efficiencies of the organic luminescent materials, thereby balancing the light intensities output by each color channel while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If polarizers are used for color light filtering, then the color purity is high, but the reflectivity of ambient light increases causing interference and poor display quality

Engineering Contradiction:

Improveambient light interferenceVSAvoiddisplay quality

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent converts the harmful effect of ambient light reflection into a beneficial feature by designing the color filter with specific thickness variations that reduce overall reflectivity. The non-uniform thickness structure, combined with the color filtering function, simultaneously achieves color purity and reduces ambient light interference, thereby improving display quality in various viewing conditions.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Illumination intensity

If the color filter is added to enhance color purity, then the contrast ratio improves, but the manufacturing complexity and process difficulty increase

Engineering Contradiction:

Improvecontrast ratioVSAvoidcolor filter fabrication

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent employs parameter changes by varying the thickness parameter of the color filter across different regions. Instead of using a uniform thickness, the thickness is specifically optimized for each color channel (red, green, blue) to compensate for the luminous efficiency differences of the corresponding organic luminescent materials. This parameter optimization achieves high contrast ratio while maintaining manufacturability through standard thin-film deposition techniques.

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 effectively balances light intensities across RGB pixels, reducing color separation and reflectivity, enhancing visual angle and power efficiency in OLED displays.

Implementation Method 1

a color light filtering layer disposed at a light exiting side of the displaying substrate, wherein the color light filtering layer includes a plurality of light filtering structures

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Implementation Method 2

In the organic light-emitting diode (OLED) display technique, the Red, Green, Blue (RGB) pixel light emission is performed by using organic light emitting devices

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS12622150B2Display panel and method for manufacturing the same, and displaying device

Publication Date: 2026.05.05 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

A display panel and a method for manufacturing the same, and a displaying device, which relates to the technical field of displaying. The display panel includes: a displaying substrate, a color light filtering layer disposed at a light exiting side of the displaying substrate. The color light filtering layer includes a first light filtering structure and a second light filtering structure of unequal thicknesses, orthographic projections of the light filtering structures on the displaying substrate cover corresponding positions of the light emitting region, and a surface of the first light filtering structure at one side away from the displaying substrate and a surface of the second light filtering structure at one side away from the displaying substrate are in a same plane.