Mosaic LED Display Panel Reducing IR Loss via Segmented Driving
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Solution Overview
Problem
Active matrix driven mini-LED or micro-LED display panels are limited in size and efficiency due to ohmic drops and signal distortions, and the RC loading of power driving circuits.
Innovation Solution
A mosaic LED display panel design featuring a printed circuit board (PCB) with a flexible substrate having holes, where the first matrix circuit on the substrate and the second matrix circuit on the PCB form pixel circuits with LEDs, and conductive structures connect the circuits through these holes, reducing border areas and enabling larger panel sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If active matrix driven mini-LED or micro-LED display panels are used, then brightness and life are improved, but size is limited due to ohmic drops and signal distortions
Solution Approach 1:
The display panel is divided into multiple independently addressable modules or tiles that can be arranged in a mosaic configuration. Each module has its own driving circuits, allowing the overall panel to be scaled to large sizes while maintaining signal integrity within each smaller module. This segmentation overcomes the ohmic drop and signal distortion limitations that constrain conventional monolithic active matrix driven displays.
2Area of stationary object
If mosaic structure is used to increase panel size, then area is improved, but RC loading of power driving becomes a severe limitation
Solution Approach 1:
The power driving system is segmented into multiple independent power management integrated circuits (PMICs), each serving a specific module or region. This distribution of power driving responsibilities reduces the RC loading on any single power line, as each segment handles only its local power delivery requirements rather than the entire panel.
Solution Approach 2:
The patent transitions from a planar two-dimensional arrangement to a three-dimensional stacked configuration where multiple substrate layers are vertically integrated. This vertical stacking allows power and signal routes to be distributed across multiple layers, reducing the horizontal trace lengths and associated RC loading on any single power line while maintaining large panel area.
3Productivity
If conventional active matrix driving is used, then pixel control is achieved, but frame rate is limited to below 120 Hz
Solution Approach 1:
The display panel is divided into multiple independently addressable modules that can be refreshed in parallel or with reduced sequential addressing requirements. This modular segmentation allows the system to achieve higher effective frame rates by distributing the addressing workload across multiple modules, reducing the total time required to address the entire display area.
Data Source
AI summary
A light emitting diode (LED) display panel is provided. The LED display panel includes a printed circuit board (PCB), a flexible substrate disposed on the PCB, and a pixel array. The flexible substrate has a plurality of holes. The pixel array is formed by a first matrix circuit disposed on the flexible substrate, a second matrix circuit disposed on the PCB, and a plurality of LEDs disposed on the PCB, collectively defining a plurality of pixels. Each of the pixels comprises a corresponding one of the LEDs and pixel circuits formed by the first matrix circuit and the second matrix circuit. A projection of each of the LEDs correspondingly overlaps with a projection of one of the holes on the flexible substrate along an extending direction of the holes. A mosaic LED display panel may be formed by multiple LED display panel butted or tiled together.