Micro LED Electrode Pad Structure for Substrate-Side Light Extraction
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Solution Overview
Problem
Micro LED display devices face a challenge in light extraction efficiency due to the blocking of light emission by electrode pads on the circuit substrate, which hinders the effective transmission of light from LED chips.
Innovation Solution
The design incorporates first and second electrode pads with light transmission regions on the circuit substrate, allowing light emitted from LED chips to pass through, enhancing light extraction efficiency by optimizing the structure and material composition of these pads to ensure uniform potential distribution and efficient light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode pads are formed on the circuit substrate to electrically connect LED chips, then electrical connection is achieved, but light transmission is blocked
Solution Approach 1:
The electrode pad is divided into a light transmission region and a light blocking region. The light transmission region allows light to pass through while the light blocking region provides electrical connection, thereby resolving the contradiction between light transmission and electrical connection.
Solution Approach 2:
Different regions of the electrode pad are assigned different functions: the light transmission region has optical transparency properties while the light blocking region has electrical conductivity properties. This local differentiation allows simultaneous achievement of light transmission and electrical connection.
2Illumination intensity
If transparent conductive materials are used for electrode pads to improve light transmission, then light transmission efficiency increases, but electrical conductivity may be reduced
Solution Approach 1:
The electrode pad is constructed as a composite structure with a first electrode pad layer having light transmission properties and a second electrode pad layer having high electrical conductivity. This composite structure simultaneously achieves both light transmission and electrical connection reliability.
Solution Approach 2:
The electrode pad structure is designed to perform multiple functions: the light transmission region provides optical transparency while the light blocking region provides electrical connection. This multi-functionality resolves the trade-off between light transmission and electrical conductivity.
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 improves the light extraction efficiency from the circuit substrate side, enabling the micro LED display devices to emit light on both sides and maintain high adhesive strength between the LED chips and the substrate, thus enhancing display performance.
Implementation Method 1
The first electrode pad comprises a first light transmission region that transmits light emitted from the LED chip
Data Source
AI summary
A display device includes a circuit substrate comprising a first electrode pad and an LED chip comprising a first electrode bump that is electrically connected to the first electrode pad, and at least emitting light in a direction of the circuit substrate. The first electrode pad comprises a first light transmission region that transmits light emitted from the LED chip.