LED Display Diode Layout to Reduce Light-Induced Leakage
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Solution Overview
Problem
In LED display apparatuses, leakage current in switching elements due to light irradiation leads to decreased luminance, and there is a need for non-obstructive placement of switching and LED elements, which is challenging in existing designs.
Innovation Solution
A display apparatus with a substrate structure that includes a first diode element and a second diode element, where the second diode element is electrically connected to the terminals of the first diode element, and bump electrodes are formed using an electroplating method to facilitate electrical connections while minimizing space and obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a switching element is placed near LED elements to control their operation, then the display apparatus can achieve proper element placement and control functionality, but leakage current is generated in the switching element when irradiated with light from LED elements, causing decreased luminance
Solution Approach 1:
A transparent conductive oxide film is introduced as an intermediary layer between the switching element and the LED element. This film allows light to pass through to the LED element while blocking or reducing the light-induced leakage current in the switching element, thus resolving the contradiction between placement freedom and leakage current generation
Solution Approach 2:
The patent utilizes the transparent conductive oxide film to convert the harmful light-induced leakage current into a beneficial structure that maintains electrical connectivity while optically protecting the switching element. The film's transparency allows light transmission for LED operation while its electrical properties block harmful currents
2Adaptability or versatility
If the switching element is positioned to minimize obstruction in plan view for design freedom, then placement flexibility is improved, but the leakage current problem persists and luminance decreases
Solution Approach 1:
The transparent conductive oxide film serves as a mediator that enables design freedom by allowing the switching element to be positioned without obstruction while simultaneously protecting against luminance degradation through light management and electrical isolation
3Ease of manufacture
If conventional connection methods are used for mounting LED elements, then manufacturing is straightforward, but space usage is inefficient and design flexibility is limited
Solution Approach 1:
The patent merges the connection terminal and the light-blocking function into a single integrated structure. The connection terminal includes both electrical connection functionality and the transparent conductive oxide film for light management, eliminating the need for separate components and reducing overall space requirements while maintaining manufacturing simplicity
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 reduces leakage current and allows for more flexible placement of switching and LED elements, enhancing luminance and design freedom by improving electrical connections and reducing space usage.
Implementation Method 1
a step (b) of forming a first bump electrode on the first terminal and a second bump electrode on the second terminal. The step (b) includes a step of forming the first bump electrode and the second bump electrode by an electroplating method
Data Source
AI summary
Performance of a display apparatus is improved. A display apparatus includes: an LED element and a diode element. An anode electrode of the diode element is connected to a cathode electrode of the LED element through a second terminal pattern and a second bump electrode. A cathode electrode of the diode element is connected to an anode electrode of the LED element through a first terminal pattern and a first bump electrode.