Light-emitting element with segmented anode for color consistency
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Solution Overview
Problem
Display devices with angled anode electrodes still experience color variations when viewed from oblique directions due to optical path differences, leading to inconsistent color perception.
Innovation Solution
A light-emitting element design featuring a first conductive layer with a flat surface for reflecting visible light, a second conductive layer with varying thickness regions, a functional light-emitting layer, and a second electrode that transmits visible light, along with an edge cover containing scattering or light-blocking materials to reduce optical path variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anode electrode is angled or shaped into a bowl to reduce viewing angle dependence, then color variations from oblique directions are reduced, but optical path differences still cause color variations at large viewing angles
Solution Approach 1:
The anode electrode is segmented into multiple conductive layers (first conductive layer with flat surface, second conductive layer with varying thickness, third conductive layer) that perform different optical functions. This segmentation allows each layer to address specific optical path issues independently, solving the color variation problem while maintaining structural organization.
Solution Approach 2:
Different regions of the anode electrode have different thicknesses and optical properties. The second conductive layer has a center region with first thickness and a peripheral region with second thickness, creating local variations in optical path length to compensate for viewing angle-dependent color shifts.
2Illumination intensity
If a flat first conductive layer is used to reflect visible light, then light reflection efficiency is improved, but optical path differences cause color variations when viewed from oblique directions
Solution Approach 1:
The anode electrode structure transitions from a symmetric flat surface to an asymmetric multi-layer configuration with varying thicknesses. The second conductive layer has different thicknesses in different regions, creating asymmetric optical paths that compensate for the asymmetric viewing angles, thereby maintaining color consistency.
Solution Approach 2:
The solution moves from a two-dimensional flat surface to a three-dimensional multi-layer structure with varying thicknesses. By adding the thickness dimension to the conductive layers, the patent creates additional optical path control capabilities that address color variations at oblique viewing angles while maintaining high reflection efficiency.
3Reliability
If the second conductive layer has varying thickness regions, then optical path differences are compensated to reduce color variations, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the thickness parameter of the second conductive layer across different regions to compensate for optical path differences. By systematically varying this parameter from the center region to the peripheral region, the invention achieves color consistency while providing clear manufacturing specifications for thickness control.
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 significantly reduces viewing angle dependence of color variations, ensuring consistent color perception even from large oblique angles by managing the optical path differences and scattering/blocking light effectively.
Implementation Method 1
a first conductive layer and a second conductive layer, the first conductive layer having a flat upper surface and reflecting visible light
Implementation Method 2
an edge cover containing at least one of a scattering material to scatter the visible light or a light-blocking material to block the visible light
Data Source
AI summary
A light-emitting element includes: a first electrode including a first conductive layer and a second conductive layer, the first conductive layer being provided with a flat surface serving as an upper surface and reflecting visible light, and the second conductive layer being provided on the flat surface, transmitting the visible light, and including a first region having a first thickness, a second region positioned around the first region and having a second thickness thicker than the first thickness, and a third region positioned around the second region and having a third thickness thicker than the second thickness; a functional layer including at least a light-emitting layer and formed on the second conductive layer in conformity with a shape of the second conductive layer, and a second electrode formed on the functional layer and transmitting the visible light; and an edge cover containing at least one of a scattering material to scatter the visible light or a light-blocking material to block the visible light, covering at least a portion of an end portion of the first electrode, and formed higher than the second electrode.