Mixed Orientation LED Display Wiring for Repair and Heat Resistance
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Solution Overview
Problem
Current display devices using semiconductor light-emitting diodes face challenges such as complex manufacturing processes, high costs due to facility investments, and technical difficulties in exchanging defective vertical type semiconductor light-emitting diodes, especially when using red, green, and blue diodes with different physical characteristics.
Innovation Solution
A display device configuration that combines horizontal and vertical type semiconductor light-emitting diodes with a specific wiring structure, allowing for simpler manufacturing and easy exchange of defective diodes, using first, second, and third wirings to connect conductive electrodes of both types of diodes on a substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vertical type semiconductor light-emitting diodes are used for display devices, then the display device can achieve good yield and long life span, but the manufacturing process becomes complex and costly due to heat-treatment requirements of 400°C or more for ohmic contact of n type electrode, which adhesive cannot endure
Solution Approach 1:
The patent divides the semiconductor light-emitting diode into two orientations: vertical type LEDs for most positions and horizontal type LEDs for positions requiring heat treatment. This segmentation allows each type to be used where it is most suitable, resolving the contradiction between reliability and ease of manufacture.
Solution Approach 2:
The patent introduces a horizontal type semiconductor light-emitting diode as an intermediary solution for positions where vertical type LEDs cannot be used due to heat treatment requirements. The horizontal type LED serves as a mediator that can withstand the heat treatment process while maintaining display functionality.
2Reliability
If vertical type semiconductor light-emitting diodes are used, then the display device achieves good yield, but exchange repair becomes technically difficult requiring additional facility investment and separate chip design
Solution Approach 1:
The patent makes the horizontal type semiconductor light-emitting diode serve multiple functions: it can be used in positions where vertical type LEDs cannot be applied due to heat treatment, and it can also serve as a replacement for defective vertical type LEDs during exchange repair, eliminating the need for separate repair chips and facilities.
3Adaptability or versatility
If red, green, and blue semiconductor light-emitting diodes with different physical characteristics are used, then full color display is achieved, but the manufacturing process becomes more complex due to different physical properties of each diode type
Solution Approach 1:
The patent applies different orientations of semiconductor light-emitting diodes to different locations based on local requirements: vertical type LEDs are used in positions not requiring heat treatment, while horizontal type LEDs are used in positions requiring heat treatment. This local differentiation simplifies the overall manufacturing process while maintaining full color display capability.
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 simplifies the display process, reduces costs, and facilitates the exchange of defective diodes without additional facility investments, enabling a more efficient and cost-effective production of color displays.
Implementation Method 1
light-emitting diodes (LEDs) are well known light-emitting devices for converting an electrical current to light
Data Source
AI summary
A display device including a plurality of vertical type semiconductor light-emitting diodes; a plurality of horizontal type semiconductor light-emitting diodes; a first wiring formed on a substrate and including a plurality of electrode lines, a first electrode line being connected with first conductive electrodes of the vertical type semiconductor light-emitting diodes and a second electrode line being connected with first conductive electrodes of the horizontal type semiconductor light-emitting diodes; a second wiring spaced apart from and crossing the first wiring and electrically connected with second conductive electrodes of the vertical type semiconductor light-emitting diodes; and a third wiring formed on the substrate, electrically connected with the second wiring, and connected with second conductive electrodes of the horizontal type semiconductor light-emitting diodes.