Dual-Material Reflection Plate for LED Display Sub-Pixels
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Solution Overview
Problem
Display devices using light emitting diodes (LEDs) face challenges in simultaneously achieving optimal optical and electrical characteristics, particularly in maintaining high reflectance while preventing the formation of an oxide film that increases resistance.
Innovation Solution
The display device incorporates a substrate with active and non-active areas, featuring light emitting diodes and transistors in each sub-pixel, along with reflection plates. The reflection plates have a dual structure, with a high-reflectance first part overlapping the LEDs and a second part extending from the first part, formed of different materials to suppress oxide film formation and maintain low resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a material having a high reflectance is used for the reflection plate, then the light emission efficiency is improved, but the resistance of the reflection plate increases due to oxide film formation
Solution Approach 1:
The reflection plate is divided into two distinct parts: a first part with high reflectance for optimal light emission, and a second part with oxide-resistant properties for maintaining low electrical resistance. This segmentation allows each part to fulfill its specific function without compromise.
Solution Approach 2:
Different regions of the reflection plate are assigned different material properties tailored to their specific functions. The first part uses high-reflectance material where light emission is critical, while the second part uses oxide-resistant material where electrical conductivity is critical.
2Ease of manufacture
If the reflection plate is formed of a single material, then the manufacturing process is simplified, but it cannot simultaneously satisfy both optical and electrical characteristics
Solution Approach 1:
The reflection plate employs a composite structure combining two different materials, each selected for its specific properties. This composite approach enables the single component to simultaneously satisfy both optical (reflectance) and electrical (resistance) characteristics that cannot be achieved with a single material.
Solution Approach 2:
The reflection plate is designed as a multi-functional component where the first part optimizes optical performance and the second part ensures electrical performance. This universal design allows one component to fulfill multiple critical functions.
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 enhances light emission efficiency while improving electrical characteristics, reducing the risk of screen failure due to oxide film formation and ensuring reliable long-term operation.
Implementation Method 1
a first part overlapping the light emitting diode and a second part extending from the first part, in which the first and second parts are formed of different materials
Data Source
AI summary
A display device including a display panel including a plurality of sub pixels, in which each sub pixel includes at least one light emitting diode, at least one transistor configured to drive the at least one light emitting diode to emit light and a reflection plate including a first part disposed below and overlapping the at least one light emitting diode and a second part extending from the first part, and wherein the first part of the reflection plate includes a material having a higher reflectance than a material of the second part extending from the first part.