Active Matrix LED Display Flexible Substrate Wiring Reduction
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Solution Overview
Problem
Current large-size display technologies face challenges in cost, weight, and installability due to the limitations of liquid crystal and organic EL displays, and the complexity of active matrix LED systems, which hinder their widespread adoption for digital signage applications.
Innovation Solution
An active matrix LED display with a flexible substrate using inorganic LED elements and a pixel driving circuit that minimizes lead-out wires, allowing for efficient processing and low-cost manufacturing, enabling lightweight and flexible large-size displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If liquid crystal display technology is used for large-size displays, then the display can be manufactured on large glass substrates, but the manufacturing cost rapidly increases and the weight increases making installation difficult
Solution Approach 1:
The patent uses flexible resin substrates instead of rigid glass substrates to manufacture large-size displays. This allows the display to be lightweight and flexible for easy installation while maintaining large display area. The flexible substrate enables the display to be bent and mounted on various surfaces without the weight and rigidity constraints of glass.
Solution Approach 2:
The patent employs cost-effective resin substrates and simple wiring structures that reduce manufacturing costs for large-size displays. By using affordable materials and minimizing complex components, the overall display cost is reduced while achieving large display areas.
2Area of stationary object
If active matrix LED system is used for large-size displays, then the display can be enlarged without size limit, but complicated wiring and control circuits increase device complexity and cost
Solution Approach 1:
The patent divides the large-size display into multiple display units, each with its own pixel forming units. Each unit can be controlled independently through simplified wiring, avoiding the need for complicated overall wiring. The segmentation allows large display areas to be achieved while maintaining manageable complexity in each module.
Solution Approach 2:
The patent uses a matrix arrangement of pixel forming units with row and column selection lines, enabling efficient addressing of individual pixels through two-dimensional coordinate system. This dimensional approach reduces the number of required control lines compared to sequential scanning methods.
3Weight of stationary object
If inorganic LED elements are used with flexible substrate, then the display becomes lightweight and flexible, but minimizing lead-out wires while maintaining active matrix control is challenging
Solution Approach 1:
The patent implements an active matrix driving system where pixel driving circuits dynamically control the timing and sequence of signals to individual LED elements. This dynamic control allows efficient use of lead-out wires through time-division multiplexing, reducing the number of physical wires needed while maintaining precise control over each pixel.
Solution Approach 2:
The pixel driving circuits are designed to perform multiple functions: selecting rows and columns, controlling LED activation timing, and managing signal routing. This multi-functionality reduces the overall complexity of the lead-out wiring system by consolidating control functions into integrated circuits rather than requiring separate dedicated wires for each function.
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 solution reduces manufacturing costs and weight while enabling the creation of large, flexible, and lightweight active matrix LED displays, overcoming the limitations of existing technologies by using inorganic LED elements and efficient substrate processing methods.
Implementation Method 1
at least one inorganic LED element
Data Source
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AI summary
Large size LED displays have a high number of lead-out wires and thus require a driver circuit for every small display unit, thereby resulting in an increased case size which puts constraints on the installation location for the device. In the present invention, inorganic LED elements (410, 411, 412) are mounted on an active matrix substrate provided with pixel circuit driving substrates (300) in a matrix. Furthermore, the pixel circuit driving substrates (300) also have mounted thereon elements fabricated with a different substrate, similarly to the inorganic LED elements (410, 411, 412) . This makes it possible to provide an active matrix LED display that can significantly reduce the number of lead-out wires for driving the inorganic LED elements (410, 411, 412), that can be installed in various places at low cost, and that is flexible, lightweight, and large.