Sub-Pixel Layout Separating LEDs and Transistors for Uniform Luminance
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Solution Overview
Problem
Display devices using light emitting diodes (LEDs) face challenges in maximizing light extraction efficiency and minimizing the impact of electric fields on pixel circuits during the assembly process, leading to potential damage and uneven luminance.
Innovation Solution
The design includes a substrate with spaced apart assembly lines and transistors, where the light emitting elements are separated from the transistor areas, allowing for improved light extraction efficiency and reduced electric field influence on the pixel circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If light emitting elements are disposed close to assembly lines for compact design, then device volume is reduced, but light extraction efficiency deteriorates and electric field damage to transistors increases
Solution Approach 1:
The patent introduces a vertical dimension by forming an opening that extends from the first surface to the second surface of the substrate. The light emitting element is positioned within this opening, allowing it to be spatially separated from the assembly lines in the horizontal plane while maintaining a compact overall device volume. This vertical arrangement resolves the contradiction by enabling close proximity in one dimension (vertical) while maintaining distance in another dimension (horizontal) to prevent electric field damage.
2Area of stationary object
If assembly lines are positioned close to transistors for compact pixel design, then pixel area is reduced, but electric field influence on pixel circuits increases causing potential damage
Solution Approach 1:
The patent segments the pixel structure into distinct functional zones: a first area containing transistors and a second area containing the light emitting element within the opening. This spatial segmentation separates the electric field-generating assembly lines from the sensitive transistor regions, allowing compact pixel design while protecting pixel circuits from electric field damage through the structural division.
3Reliability
If light emitting elements are separated from transistor areas for safety, then electric field damage is prevented, but device complexity increases
Solution Approach 1:
The opening structure serves multiple functions simultaneously: it provides physical separation between light emitting elements and assembly lines to prevent electric field damage, enables compact vertical integration to maintain small device volume, and creates distinct functional areas within the pixel. This multi-functionality resolves the contradiction by achieving transistor protection without proportionally increasing device complexity.
Data Source
AI summary
A display device includes a substrate that has a display area in which a plurality of sub-pixels are disposed and a non-display area. The display device further includes a first assembly line and a second assembly line disposed in the plurality of sub-pixels on the substrate and spaced apart from each other. The display device further includes a light emitting element disposed on the first assembly line and the second assembly line. The display device further includes a plurality of transistors disposed in the plurality of sub-pixels. Each of the plurality of sub-pixels includes a first area in which the plurality of transistors are disposed and a second area which is separated from the first area and in which the light emitting element is disposed.