Stacked Micro LED Unit Layout for Brighter Compact Displays
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Solution Overview
Problem
Conventional LEDs require a large number of chips to form a display apparatus, leading to excessive time consumption in the mounting process and occupying a significant area, which can result in reduced brightness due to a smaller luminous area.
Innovation Solution
The use of micro LEDs, constructed with stacked LED stacks and unique electrode connections, allows for a compact configuration with each LED stack connected to two electrode pads for independent driving, and includes growth substrates to simplify manufacturing and reduce the likelihood of ohmic electrode peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If individual LED chips are arranged in a two-dimensional plane to form subpixels, then the display can generate various colors, but the number of LED chips required exceeds millions, causing excessive time consumption for mounting
Solution Approach 1:
The patent transitions from a two-dimensional arrangement of LED chips to a three-dimensional stacked structure. Multiple LED stacks are arranged vertically, with each stack containing multiple LED chips at different heights. This vertical stacking enables color generation while significantly reducing the number of chips required per pixel area, thereby reducing mounting time and improving productivity.
2Area of stationary object
If subpixels are arranged in a two-dimensional plane, then various colors can be emitted, but a relatively large area is occupied by one pixel, and reducing the area causes deterioration in brightness
Solution Approach 1:
The patent employs vertical stacking of multiple LED chips to increase the luminous area within a compact pixel footprint. By arranging LED chips in three-dimensional stacks rather than spreading them out in two dimensions, the design achieves higher brightness without increasing the horizontal pixel area, effectively resolving the trade-off between area and illumination intensity.
3Area of stationary object
If micro LEDs with stacked LED stacks are used, then the area of each subpixel can be increased without increasing the pixel area, but a compact configuration with unique electrode connections is required
Solution Approach 1:
The patent utilizes vertical stacking to increase subpixel area while maintaining compact pixel dimensions. Multiple LED stacks are positioned at different heights along the vertical axis, allowing each subpixel to occupy more three-dimensional space without expanding the two-dimensional pixel footprint.
Solution Approach 2:
The patent implements a common electrode structure that serves multiple LED stacks simultaneously. A single common electrode pad connects to multiple LED stacks through via holes, reducing the total number of electrode connections required. This multi-functional electrode design simplifies the connection structure while supporting the stacked configuration.
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 increases the area of each subpixel without increasing the pixel area, reduces the time for the mounting process, and provides a structurally stable light emitting device for displays.
Implementation Method 1
a first light emitting diode (LED) sub-unit, a second LED sub-unit disposed below the first LED sub-unit, a third LED sub-unit disposed below the second LED sub-unit
Data Source
AI summary
A light emitting device for a display including a transparent member laterally extending in a first direction and having a first region and a second region surrounding the first region, first to third light emission regions disposed on the transparent member, a support substrate, first to fourth electrode pads disposed between the transparent member and the support substrate, and vias electrically connecting the electrode pads to the light emission regions, respectively, in which the fourth electrode pad is electrically connected to at least one of the vias, each light emission region is disposed in the first region and does not overlap the second region in a second direction, and the fourth electrode pad overlaps one of the vias and one of the light emission regions in the second direction, and the one of the vias and the one of the light emission regions are separated from each other.