关键词: 无衬底Micro LED芯片, 直显, PM玻璃基板, AM玻璃基板

Abstract: Micro LED technology offers numerous advantages, such as high brightness, high contrast ratio, high resolution, low power consumption, and long lifespan. As chip sizes continue to decrease, research into the application of substrate-free Micro LED chips is becoming increasingly urgent. These substrate-free Micro LED chips have extremely small dimensions, resulting in a light-emitting area ratio of the screen of less than 1%, which significantly enhances the contrast ratio. This paper presents a comparsion of the application of Micro LED on PM (passive matrix) driving glass substrates and AM (Active Matrix) driving glass substrates. PM driving glass substrates can achieve a minimum line width/spacing of 12 μm (compared to the 50 μm limit of traditional PCB substrates), making them suitable for even smaller chip sizes. By integrating massive TGV (through glass via) and thick-copper technologies, a cost-performance balance can be achieved without compromising display quality. Meanwhile, targeted design solutions are implemented to address the strength and reliability of glass substrates. AM driven LED displays utilize fully flip-chip high-voltage μA-level chips. Driven by a 12 V switching power supply, this high-voltage, low-current driving mode significantly reduces current density. Simultaneously, the pixel-level precise control enabled by AM driving supports independent voltage boosting in any arbitrary area, allowing for localized peak brightness display. The application technologies of PM driving glass substrates and AM driving glass substrates, both utilizing substrate-free Micro LED chips for direct-view displays, are driving the evolution of display technology towards ultra-high definition and lower power consumption.

Key words:

substrate-free Micro LED chip,  , direct-view display,  , PM-driven glass substrates, AM-driven glass substrates