Pixel Electrode Layout for Uniform Light Output in Sub-Pixels
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Solution Overview
Problem
Existing display devices face challenges in enhancing light output efficiency and uniformity of light distribution among sub-emission areas within pixels, which affects the overall performance and reliability of the display.
Innovation Solution
The proposed pixel structure includes a serial/parallel combination of light emitting elements in sub-pixel areas, connected through intermediate electrodes and contact electrodes, allowing for enhanced light output efficiency and uniform distribution by forming sets of electrodes and light emitting elements in specific sub-areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light emitting elements are arranged in sub-emission areas within pixels, then light output efficiency is improved, but uniformity of light distribution among sub-emission areas deteriorates
Solution Approach 1:
The pixel is divided into multiple sub-emission areas (first, second, third sub-emission areas) with different numbers of light emitting elements. Specifically, the first and second sub-emission areas each contain two light emitting elements, while the third sub-emission area contains one light emitting element. This segmentation allows optimization of light output efficiency in each region while maintaining overall uniformity through the intermediate electrode connection structure.
Solution Approach 2:
An intermediate electrode is introduced to electrically connect the first, second, and third sub-emission areas. This intermediary component enables current distribution across different sub-emission areas with varying numbers of light emitting elements, ensuring uniform light distribution despite the segmented structure designed for enhanced light output efficiency.
2Productivity
If multiple light emitting elements are connected in parallel within sub-pixel areas, then light output efficiency is enhanced, but device complexity increases
Solution Approach 1:
Multiple light emitting elements within each sub-emission area are connected in parallel between corresponding first and second electrodes. This merging approach enhances light output efficiency by allowing multiple elements to contribute simultaneously to light generation, while the shared electrode structure avoids excessive complexity by reusing common electrical connections across sub-emission areas.
Solution Approach 2:
The first and second electrodes serve multiple functions: they define the boundaries of sub-emission areas, provide electrical connections for parallel-connected light emitting elements within each area, and facilitate current distribution across different sub-emission areas through the intermediate electrode. This multi-functionality reduces overall device complexity despite the presence of multiple light emitting elements.
Data Source
AI summary
A pixel includes first and second sub-pixel areas adjacent to each other in a first direction; first and second electrodes disposed in each of the first and the second sub-pixel areas, and spaced apart from each other; light emitting elements disposed between the first and the second electrodes in each of the first and the second sub-pixel areas; a first driving transistor disposed in the first sub-pixel area, and electrically connected to the first electrode; and a second driving transistor disposed in the second sub-pixel area, and electrically connected to the first electrode. The first electrode of the first sub-pixel area and the first electrode of the second sub-pixel area are electrically disconnected from each other, and the second electrode of the first sub-pixel area and the second electrode of the second sub-pixel area are electrically connected to each other.