Pixel Electrode Thickness Variation for Viewing Angle Color Consistency

Solution Overview

Problem

Conventional organic light-emitting display apparatuses suffer from color coordinate recognition issues when viewed from different angles, leading to inconsistent image quality.

Innovation Solution

A display apparatus is designed with an inorganic insulating layer, driving voltage lines, and wiring structures on the substrate, along with organic insulating layers and pixel electrodes, to maintain consistent image quality across various viewing angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional organic light-emitting display apparatuses are used, then the display can show images, but the color coordinates vary depending on the viewing angle

Engineering Contradiction:

Improvecolor coordinate consistencyVSAvoidviewing angle dependency

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The pixel electrode is designed with different thicknesses in different regions. Specifically, the pixel electrode has a first thickness in a first region and a second thickness in a second region, where the thickness varies to compensate for viewing angle effects. This local variation in electrode thickness creates different optical path lengths that correct the color shift observed at different viewing angles, thereby improving color coordinate consistency across various viewing positions.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If the pixel electrode thickness is made uniform, then the manufacturing process is simpler, but the image quality degrades at oblique viewing angles

Engineering Contradiction:

Improvepixel electrode fabricationVSAvoidimage quality consistency

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The pixel electrode is designed with different thicknesses in different regions. Specifically, the pixel electrode has a first thickness in a first region and a second thickness in a second region, where the thickness varies to compensate for viewing angle effects. This local variation in electrode thickness creates different optical path lengths that correct the color shift observed at different viewing angles, thereby improving color coordinate consistency across various viewing positions.

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

The proposed solution ensures that the display apparatus maintains high-quality image rendering regardless of the viewing angle, addressing the color coordinate inconsistencies of conventional systems.

Implementation Method 1

Organic light-emitting display apparatuses include an organic light-emitting diode as a display device. An organic light-emitting diode includes a pixel electrode, an opposite electrode, and an emission layer interposed between the pixel electrode and the opposite electrode.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20250151552A1Display apparatus

Publication Date: 2025.05.08 SAMSUNG DISPLAY CO LTD

AI summary

Provided is a display apparatus including a driving voltage line disposed on an inorganic insulating layer, a first wiring located adjacent to one side of the driving voltage line, a second wiring located adjacent to another side of the driving voltage line, an organic insulating layer disposed on the driving voltage line, the first wiring, and the second wiring, a pixel electrode disposed on the organic insulating layer, and a pixel defining layer including an opening that exposes the pixel electrode. One edge of the pixel defining layer overlaps the first wiring in a plan view.