On November 1, 2024, Changchun Cedar Electronics Technology Co., Ltd. announced the application for an invention patent titled “A Method for Testing Micro LED Light Emitting Chips” (Patent Application No. CN118884188A).

Micro LED Patent Abstract:
This invention discloses a Micro LED light-emitting chip testing method in the field of Micro LED display technology, addressing the issue of brightness mismatch among the red, green, and blue LED channels when driven by the TFT-AM technology. This mismatch is caused by the performance differences between the TFT and the LED, leading to uneven grayscale and brightness uniformity problems.
The method involves designing a Micro LED test array module based on a PCB substrate, with the LED arrays connected in parallel internally and driven by a voltage source externally. This configuration ensures that the voltage applied to each LED is consistent. The testing process involves measuring the voltage of the red, green, and blue Micro LED arrays from 0 grayscale to 255 grayscale, and calculating the greatest common divisor of the minimum grayscale voltage for each of the red, green, and blue modules, as well as the minimum grayscale level for the Micro LED white field. This invention is applicable in the Micro LED display field.

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