Stacked Light-Emitting Array Chip With Non-p-Type DBR Drive Layout
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Solution Overview
Problem
In light-emitting element arrays, achieving independent low-side drive for some light-emitting elements while others are driven on a high side to improve power conversion efficiency and drive speed is challenging, especially when using a non-p-type semiconductor lower distributed Bragg reflector.
Innovation Solution
A light-emitting element array chip configuration with a first light-emitting element array on a substrate and a second light-emitting element array with a non-p-type lower reflector, where the first cathode electrode is connected to the back surface and the anode electrode is separated, allowing independent low-side drive of both arrays, and integrated with a diffusion member for wider light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a non-p-type semiconductor lower distributed Bragg reflector is used to improve power conversion efficiency, then power conversion efficiency is improved, but independent low-side drive becomes difficult to achieve
Solution Approach 1:
The light-emitting element array is divided into multiple independently controllable regions or elements. Each light-emitting element can be driven separately through individual anode electrodes and shared cathode electrode connections, enabling selective activation of specific elements while maintaining the non-p-type lower DBR structure for high power conversion efficiency.
Solution Approach 2:
The cathode electrode on the back surface serves as a common electrode for multiple light-emitting elements, while each element has its own anode electrode on the emission surface. This universal cathode design with individual anodes enables both high-side and low-side drive configurations, providing operational flexibility while maintaining efficient energy conversion.
2Ease of operation
If high-side drive is used to achieve independent control of light-emitting elements, then independent control is achieved, but drive speed decreases
Solution Approach 1:
The drive configuration is made dynamic and adaptable. The system can switch between high-side drive and low-side drive modes depending on the specific light-emitting element being controlled. This dynamic drive capability allows optimization of drive speed for individual elements while maintaining independent control across the entire array.
3Ease of operation
If some light-emitting elements are driven independently with separated anode electrodes, then independent drive is achieved, but device complexity increases
Solution Approach 1:
Multiple cathode electrodes are merged into a single common cathode electrode on the back surface that serves all light-emitting elements. This consolidation reduces the number of separate electrodes needed, simplifying the overall device structure while still enabling independent control through individual anode electrode connections on the emission surface.
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 enables efficient independent drive of light-emitting elements, improves power conversion efficiency, and allows for three-dimensional shape measurement and authentication processing in information processing devices.
Implementation Method 1
a lower distributed Bragg reflector configured with a non-p-type semiconductor such as an n-type semiconductor or an i-type (intrinsic) semiconductor
Data Source
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AI summary
The present invention provides a light-emitting element array chip, provided with: a low-power light-emitting element array having a first substrate, a light-emitting element layer formed on the first substrate, and a first cathode electrode electrically connected to the light-emitting element layer; and a high-power light-emitting element array having a second substrate, a non-p-type lower reflection mirror formed on the second substrate, and a second cathode electrode electrically connected to the non-p-type lower reflection mirror. The low-power light-emitting element array is provided on the emission surface side of the high-power light-emitting element array.