LG Display has filed a patent for an electroluminescent display device with a variable refresh rate mode to reduce luminance differences during refresh rate changes. The device includes a display panel, scan driver, and light emission signal driver, with pixels capable of adjusting refresh rates for a seamless viewing experience. GlobalData’s report on LG Display gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on LG Display, Under-screen fingerprint recognition was a key innovation area identified from patents. LG Display's grant share as of January 2024 was 55%. Grant share is based on the ratio of number of grants to total number of patents.

Electroluminescent display device with variable refresh rate

Source: United States Patent and Trademark Office (USPTO). Credit: LG Display Co Ltd

The patent application (Publication Number: US20240038172A1) describes a display device with a unique pixel circuit that can vary the refresh rate of electroluminescent devices within each pixel. The device includes a scan driver and a light emission signal driver on opposite sides of the display panel. The pixel circuit within each pixel includes components such as driving transistors, switching transistors, and light emission control transistors to control the refresh rate and light emission of the electroluminescent device.

Furthermore, the pixel circuit includes bias transistors, capacitors, compensation transistors, and data supply transistors to ensure proper functioning and control of the electroluminescent device. The light emission signal driver is responsible for adjusting the duty ratio of the light emitting signal based on the refresh rate. Additionally, the patent application details the dynamic control of bias voltages during switching between different refresh rates to optimize performance. Overall, the display device described in the patent application offers a novel approach to controlling refresh rates and light emission in electroluminescent displays, potentially leading to improved display quality and efficiency.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.