Micro-LED Luminous Panel Manufacturing via Segmented Control Circuits
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Solution Overview
Problem
Current display technologies such as LCD, plasma, and OLED face issues like power inefficiency, screen burn-in, high manufacturing costs due to complex thin-film deposition methods, and limited lifespan, making them unsuitable for large-scale, cost-effective production of luminous panels.
Innovation Solution
A method involving the manufacturing of luminous panels using inorganic micro-LEDs with a stack of semiconductor layers and separate control circuits formed in silicon substrates, eliminating the need for expensive thin-film transistor technology by interconnecting transistors after placement, and using a handle substrate for efficient microchip placement and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TFT technology with thin-film deposition is used to manufacture control circuits, then the display can be produced, but the manufacturing cost increases substantially due to expensive equipment and complex processes requiring 5 to 9 photolithography masks
Solution Approach 1:
The invention segments the control circuit manufacturing into two independent parts: (1) standard TFT control circuits manufactured on glass substrates using conventional photolithography, and (2) transparent conductive circuits manufactured separately using conductive polymers or nanowires. These segments are then integrated through co-firing or lamination processes, thereby avoiding the need for expensive large-area thin-film deposition equipment while maintaining display functionality.
Solution Approach 2:
The invention introduces transparent conductive polymers or nanowires as intermediary materials that serve dual functions: as transparent electrodes replacing traditional ITO layers and as conductive traces for signal routing. These intermediaries are deposited using low-cost solution-based techniques rather than expensive vacuum deposition, significantly reducing manufacturing costs while maintaining electrical performance.
2Area of stationary object
If large-area thin-film deposition equipment is used to manufacture control circuits on large surfaces, then large dimension displays can be produced, but the equipment cost increases substantially limiting production to few market operators
Solution Approach 1:
The invention divides the large-area display manufacturing into modular components: standard TFT circuits on glass substrates can be manufactured using conventional smaller-scale equipment, and transparent conductive layers are applied separately using solution-based techniques that do not require large-area vacuum deposition equipment. This segmentation enables production without expensive large-area thin-film equipment.
Solution Approach 2:
The invention replaces mechanical vacuum deposition systems with solution-based processing techniques for manufacturing transparent conductive circuits. Solution-based methods such as spin-coating, dip-coating, or inkjet printing can be performed on large areas using simple, low-cost equipment, eliminating the need for expensive large-area physical vapor deposition or chemical vapor deposition equipment.
3Reliability
If OLED technology is used for luminous panels, then the display can be produced, but the lifetime becomes too short limiting use to short-lived devices like smartphones
Solution Approach 1:
The invention creates a hybrid display structure combining inorganic TFT control circuits on glass substrates with organic transparent conductive materials. The inorganic TFTs provide stable, long-lived control functionality, while the organic transparent conductors provide flexibility and optical performance. This composite approach leverages the longevity of inorganic semiconductors for control functions, thereby extending overall display lifetime beyond what pure OLED technology can achieve.
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 approach enables the production of luminous panels with longer lifetimes and improved power efficiency, reducing manufacturing costs and enabling larger surface area displays without the limitations of existing technologies, while maintaining responsive control and display quality.
Implementation Method 1
luminous panels based on inorganic microlight-emitting diodes ('micro-LEDs'), particularly on micro-LEDs based on gallium nitride ('GaN')
Data Source
AI summary
A luminous panel includes a substrate having electric connections and an array of microchips secured to the substrate and connected to the electric connections in order to be driven. Each microchip includes control circuit based on transistors formed in a silicon volume, the circuit being connected to the substrate connections, and a micro-LED secured to the control circuit and connected thereto in order to be controlled.