Japan Display has been granted a patent for a photo sensor circuit with a unique design including photo transistors, switching transistors, and capacitance elements, all utilizing oxide semiconductor layers. The device promises improved performance and efficiency in photo sensing applications. GlobalData’s report on Japan Display gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Japan Display, Under-screen fingerprint recognition was a key innovation area identified from patents. Japan Display's grant share as of April 2024 was 63%. Grant share is based on the ratio of number of grants to total number of patents.

Photo sensor device with oxide semiconductor layers and capacitance element

Source: United States Patent and Trademark Office (USPTO). Credit: Japan Display Inc

A recently granted patent (Publication Number: US11973161B2) discloses a photo sensor device comprising a gate line, a signal line, and a photo sensor circuit on a substrate. The photo sensor circuit includes a photo transistor, first and second switching transistors, and a capacitance element. The transistors feature oxide semiconductor layers, gate electrodes, and gate insulation films. The photo transistor and first switching transistor share the same layer for their respective oxide semiconductor layers. Additionally, the device includes a reset circuit with a third switching transistor having a reset signal supplied to its gate electrode. The second switching transistor utilizes an oxide semiconductor layer as a channel layer.

Furthermore, the patent details various configurations and features of the photo sensor device. For instance, the first and second switching transistors are equipped with back gate electrodes, while the third switching transistor in the reset circuit also includes a back gate electrode. The design of the device allows for efficient operation and signal processing, with the use of oxide semiconductor layers enhancing performance. Overall, the patent highlights the innovative approach taken in developing a photo sensor device with improved functionality and design elements to enhance its performance in various applications.

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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.