PTAB Decision Remands Rejected Patent for Further Examination
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| (Source: https://www.lgdisplay.com/eng/product/tv-display/oled-4th-gen) |
By PatenTrip
LG Display has found a promising path to secure its Korean patent registration for its OLED ultralow gray image processing technology.
The Korean Patent Trial and Appeal Board (PTAB) issued a cancellation remand decision in March 2025 regarding LG Display's application titled "An organic light emitting diode display device using an ultralow gray image data processing module, and method for ultralow gray image processing" (Application No. 1020190103472).
The PTAB's decision came after LG Display appealed a prior rejection by the Korean Intellectual Property Office (KIPO) – a rejection based on the assessment that the invention lacked sufficient inventive step. With the cancellation remand now in effect, KIPO is required to conduct additional examinations of the patent application.
Originally filed in 2019 and publicly disclosed in March 2021, the technology targets a unique issue in OLED display panels.
LG Display's inventive approach utilizes an ultralow gray image processing unit specifically designed to address display defects caused by flickering. The company explained that recent quality degradation issues have emerged when near-black images—those with gray levels between 2 and 16, rather than a true 0-black level—are displayed on OLED panels. This flickering, it is believed, results from coupling effects among the voltages applied to individual subpixels.
By applying the patented technology, preset ultralow gray image data (ranging from 2 to 16 gray levels) can be converted into the lowest gray image data (0-level black), thereby preventing the flickering problem. The technology can be applied to LG Display's large-sized W-OLED applications. It is the only pending patent by LG Display that uses the term "ultralow gray" in its title.
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