EL Display Sub-Pixel Segmentation for Lifetime and Color Rendition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Color electroluminescent display devices face a trade-off between achieving accurate color rendition and extending the lifetime of the display, as materials with good color points tend to have shorter lifetimes, while those with longer lifetimes have poorer color rendition.
Innovation Solution
The use of a pixel configuration with sub-pixels made from a combination of high-lifetime and good-color electroluminescent materials, where the high-lifetime materials are used for primary color contribution and the good-color materials are driven only when necessary to achieve accurate color rendition, optimizing both lifetime and color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If EL materials with good colour points are used, then colour rendition is improved, but lifetime is reduced
Solution Approach 1:
The display device segments the EL materials into two distinct groups: high-lifetime materials and good-colour-point materials. Each group is assigned to specific sub-pixels based on their characteristics, allowing the system to leverage the advantages of both material types without compromising overall performance
Solution Approach 2:
Different EL materials are assigned to different sub-pixels based on local requirements. Sub-pixels requiring long-term stability use high-lifetime materials, while sub-pixels where colour accuracy is critical use good-colour-point materials. This local optimization resolves the contradiction by matching material properties to functional requirements
2Duration of action of stationary object
If high-lifetime EL materials are used, then display lifetime is extended, but colour rendition accuracy deteriorates
Solution Approach 1:
The display segments EL materials by their primary advantage: some sub-pixels use materials optimized for lifetime while others use materials optimized for colour points. This segmentation allows the system to achieve both long lifetime and accurate colour rendition across different parts of the display
Solution Approach 2:
The invention merges two previously mutually exclusive material choices into a unified display system. By combining high-lifetime materials and good-colour-point materials in the same device, the system achieves both extended lifetime and accurate colour rendition simultaneously
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 approach improves color rendition while extending the display's lifetime by selectively using high-lifetime materials for primary color contribution and good-color materials for enhanced accuracy, balancing the limitations of both types of materials.
Implementation Method 1
Colour electroluminescent display devices employ different EL materials to provide respective colour sub-pixels
Data Source
AI summary
A color electroluminescent, EL, display device comprising an array of pixels (11) each comprising sub-pixels (1) of two or more colors (R, G, B). For at least one of the colors (R, G, B), the pixel (11) comprises a first sub-pixel (RL, GL, BL) comprising a first EL material and a second sub-pixel (Rc, Gc, Bc) comprising a second EL material. The first EL material is of higher lifetime than the second EL material; the second EL material has better color points and/or better color rendition properties than the first EL material. In some embodiments a pixel comprises two red sub-pixels (RL, Rc), two green subpixels (GL, Gc) and two blue sub-pixels (BL, Bc), one sub-pixel of each color (RL, GL, BL) comprising relatively high lifetime EL material and the other sub pixel of each color (Rc, Gc, Bc) comprising relatively good color points EL material. In other embodiments a pixel comprises two blue sub-pixels (BL, Bc) but only one red sub-pixel and one green sub-pixel.