LED Electrode Interface Structure for Lower Leakage Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving high light-emitting efficiency due to limitations in the design and manufacturing processes of light emitting diodes (LEDs).
Innovation Solution
The proposed display device incorporates a light emitting diode (LED) structure with a metal oxide pattern interposed between the LED's second surface and the second electrode. This configuration includes a first region and a second region of the metal oxide pattern with different crystalline phases, and a contact hole exposing the LED's second surface to facilitate improved electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a metal oxide pattern with different crystalline phases is introduced between the LED and electrode, then light-emitting efficiency is improved, but device structure becomes more complex
Solution Approach 1:
The metal oxide pattern is divided into different crystalline phases (first crystalline phase and second crystalline phase) with distinct properties. The first crystalline phase provides high barrier properties to prevent leakage current, while the second crystalline phase provides high conductivity for efficient current injection into the LED. This local differentiation of material properties optimizes both leakage prevention and light-emitting efficiency without requiring complete structural redesign
Solution Approach 2:
The invention uses a composite metal oxide structure comprising at least two different crystalline phases within the same material system. This composite approach allows simultaneous achievement of contradictory properties (high barrier and high conductivity) in different regions of the metal oxide pattern, resolving the contradiction between improving light-emitting efficiency and maintaining structural simplicity
2Reliability
If the metal oxide pattern includes multiple crystalline phases, then electrical current path is optimized, but manufacturing process becomes more difficult
Solution Approach 1:
The metal oxide pattern with different crystalline phases is formed as an intermediate layer during the LED manufacturing process, before final electrode assembly. This preliminary formation of the multi-phase metal oxide structure allows subsequent processing steps to proceed with a pre-optimized electrical pathway already in place, reducing the complexity of later manufacturing steps
Solution Approach 2:
The invention controls the formation of different crystalline phases by adjusting processing parameters such as deposition conditions, annealing temperature, and oxygen partial pressure. By manipulating these parameters, the desired crystalline phase distribution is achieved during manufacturing, making the complex multi-phase structure obtainable through controlled parameter changes rather than requiring complex multi-step processes
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 design enhances light-emitting efficiency by optimizing the electrical current path and reducing threading dislocation density, leading to improved performance and reduced leakage current in the display device.
Implementation Method 1
The light emitting device may be a light-emitting diode (LED). The LED is a semiconductor device converting an energy, which is generated from recombination of holes and electrons when forward voltage is applied to a pn junction diode, to light energy.
Implementation Method 2
The LED is a semiconductor device converting an energy, which is generated from recombination of holes and electrons when forward voltage is applied to a pn junction diode, to light energy.
Implementation Method 3
The first region and the second region may have crystalline phases different from each other.
Data Source
AI summary
A display device with improved light-emitting efficiency is disclosed. The display device includes a plurality of pixels, a light emitting device provided in each of the pixels, the light emitting device having first and second surfaces which are opposite to each other, first and second electrodes electrically and respectively connected to the first and second surfaces of the light emitting device, and a metal oxide pattern interposed between the second surface of the light emitting device and the second electrode. The metal oxide pattern includes first and second regions. The first region encloses the second region, and the second region has a contact hole exposing at least a portion of the second surface. The second electrode is coupled to the second surface through the contact hole, and the first and second regions have crystalline phases different from each other.