Stacked Light-Emitting Pixel Structure for High-Luminance Displays
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Solution Overview
Problem
Display devices face challenges in achieving high luminance under high external light conditions, such as outdoors, due to reduced visibility of images.
Innovation Solution
A display device design with a substrate, pixel circuit layer, and display element layer that includes specific bank structures and light emitting elements connected through bonding electrodes, reflective electrodes, and common electrodes to enhance luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional single light emitting element structure is used, then the device complexity is low, but the luminance is insufficient for outdoor viewing
Solution Approach 1:
The pixel is divided into multiple light emitting elements (first light emitting element and second light emitting element) that are disposed at different heights within the same pixel region. This segmentation allows each element to contribute to the overall luminance, enabling high brightness output while maintaining a compact pixel structure.
Solution Approach 2:
The patent transitions from a conventional planar arrangement to a three-dimensional stacked configuration where light emitting elements are positioned at different vertical heights. The first light emitting element is disposed at a lower height and the second at a higher height, utilizing the vertical dimension to increase luminance without expanding the horizontal pixel area.
2Illumination intensity
If multiple light emitting elements are stacked vertically, then the luminance increases for outdoor visibility, but the manufacturing precision requirements increase
Solution Approach 1:
The pixel is divided into multiple light emitting elements (first light emitting element and second light emitting element) that are disposed at different heights within the same pixel region. This segmentation allows each element to contribute to the overall luminance, enabling high brightness output while maintaining a compact pixel structure.
Solution Approach 2:
The patent employs a nested structure where the second light emitting element is positioned above and overlaps the first light emitting element in the vertical direction. This nesting approach allows multiple elements to occupy the same horizontal footprint while being stacked vertically, reducing the need for precise lateral alignment and simplifying the manufacturing process.
3Use of energy by moving object
If series connection of light emitting elements is implemented, then the luminance efficiency improves, but the device complexity increases
Solution Approach 1:
The patent combines multiple light emitting elements within a single pixel, with the first and second light emitting elements electrically connected in series. This merging of elements in series configuration allows the pixel to achieve higher luminance efficiency by utilizing the same current through multiple light-generating components, while the overall pixel structure remains integrated and compact.
Data Source
AI summary
A display device includes: a substrate; a pixel circuit layer disposed on the substrate; and a display element layer disposed on the pixel circuit layer. The display element layer may include: a first bank including a first opening; a first light emitting element disposed in the first opening, and including a first bonding electrode and a second bonding electrode, the first bonding electrode being electrically connected to an electrode of a first transistor disposed in the pixel circuit layer; a second bank disposed on the first bank, and including a second opening at least partially overlapping the first opening in a vertical direction; and a second light emitting element disposed in the second opening, and including a third bonding electrode and a fourth bonding electrode, the third bonding electrode being electrically connected to the second bonding electrode.