Pixel Light Emitting Device with Penetrators for Current Crowding
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Solution Overview
Problem
Miniaturization of light emitting diodes in display devices leads to issues such as non-transparent components blocking light, electrode pads and gold wires causing brightness reduction, and current crowding effects resulting in uneven light emission, as well as the challenge of maintaining the light emitting elements during manufacturing due to their diminished size.
Innovation Solution
A pixel light emitting device is designed with a substrate and light emitting elements that include a first and second electrode layer, semiconductor layers, a light emitting layer, and penetrators for electrical connection, along with a shading layer and fluorescent material layers to address the issues of light blocking and current crowding, and to prevent the light emitting elements from dropping during manufacturing by arranging them in an array on a carrier substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If light emitting elements are miniaturized to reduce size, then device compactness is improved, but manufacturing reliability deteriorates due to elements dropping or missing parts
Solution Approach 1:
The light emitting element is divided into multiple functional layers (first semiconductor layer, second semiconductor layer, light emitting layer, third semiconductor layer) with each layer serving a specific purpose. This segmentation allows for better control and attachment of each layer to the substrate, preventing dropping while maintaining miniaturization
Solution Approach 2:
The first and second electrode layers are pre-disposed on the substrate before assembling the light emitting element. This preliminary positioning ensures proper alignment and electrical connection, preventing manufacturing defects during assembly while enabling smaller element sizes
2Reliability
If non-transparent components (electrode pads, gold wires) are used for electrical connection, then electrical connectivity is improved, but light emission efficiency deteriorates due to light blocking
Solution Approach 1:
The electrode layers are disposed within the planar structure of the light emitting element rather than using vertical wire connections. The first electrode layer is positioned at the bottom and the second electrode layer at the top, creating horizontal electrical pathways that do not block light emission, thus resolving the contradiction between electrical connectivity and light efficiency
Solution Approach 2:
The traditional gold wire bonding method is extracted and replaced with integrated thin-film electrode layers. This removes the light-blocking wire component while maintaining electrical functionality through the conductive electrode layers that are part of the device structure itself
3Device complexity
If n-type and p-type electrode pads are disposed on the same side of substrate, then device structure is simplified, but brightness uniformity deteriorates due to current crowding effect
Solution Approach 1:
Instead of placing both electrode pads on the same side of the substrate, the invention inverts the arrangement by positioning the first electrode layer and second electrode layer on opposite sides of the light emitting element structure. This spatial inversion eliminates the current crowding effect while maintaining structural simplicity through the layered 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
The solution effectively prevents light blocking by non-transparent components, reduces current crowding effects, and enhances light emission efficiency, while ensuring the stability and secure transfer of light emitting elements to display panels, thereby improving display device performance.
Implementation Method 1
a light emitting layer, disposed on the second semiconductor layer
Implementation Method 2
at least one first penetrator, penetrating the light emitting layer and the second semiconductor layer to allow the electrical connection between the first semiconductor layer and the third semiconductor layer
Data Source
AI summary
A pixel light emitting device including a substrate, a plurality of light emitting elements and a shading layer disposed around each of the light emitting elements is provided. Each of the light emitting elements includes a first electrode layer disposed on the substrate, a second electrode layer not contacting with the first electrode layer, a first semiconductor layer disposed on the first electrode layer, a second semiconductor layer disposed on the second electrode layer and covering the first semiconductor layer, a light emitting layer disposed on the second semiconductor layer, a third semiconductor layer disposed on the light emitting layer, and at least one first penetrator, which penetrates the light emitting layer and the second semiconductor layer to form an electrical connection between the first semiconductor layer and the third semiconductor layer.