The Aviation Industry Corp of China has filed a patent for a display device that includes pixel circuit rows, selection lines, and a shift register with linked shift register units. The shift register units output sequential selection pulses to the selection lines, and each unit includes thin film transistors that connect the selection lines to a fixed potential wiring line during an ON state. The thin film transistors are turned ON/OFF by clock signals in different phases, with a duty cycle of 12.5% or less. GlobalData’s report on Aviation Industry Corp of China gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Aviation Industry Corp of China, smart factory applications was a key innovation area identified from patents. Aviation Industry Corp of China's grant share as of June 2023 was 60%. Grant share is based on the ratio of number of grants to total number of patents.

Display device with low duty cycle thin film transistors

Source: United States Patent and Trademark Office (USPTO). Credit: Aviation Industry Corp of China Ltd

A recently filed patent (Publication Number: US20230206873A1) describes a display device with improved pixel circuitry. The display device includes multiple pixel circuit rows and selection lines connected to these rows. It also features a shift register with linked shift register units that output sequential selection pulses to the selection lines. Each shift register unit includes multiple thin film transistors that connect the selection lines to a fixed potential wiring line during the ON state, applying a non-selection level for the selection pulse. The thin film transistors are turned ON/OFF by clock signals in different phases during each frame period, with a duty cycle of 12.5% or less for each transistor.

In this display device, the thin film transistors are N-type amorphous silicon thin film transistors, and the non-selection level is a low level. Each shift register unit also includes a second thin film transistor that applies the selection level to the corresponding selection line in the ON state, and a third thin film transistor that connects the fixed potential wiring line to the gate of the second thin film transistor. The third thin film transistor is controlled by the same clock signal as one of the thin film transistors.

The display device further includes a second shift register that is positioned opposite the first shift register across the selection lines. The second shift register consists of linked second shift register units that sequentially output selection pulses to the selection lines along with the first shift register. Each second shift register unit includes multiple fourth thin film transistors that connect the selection lines to the fixed potential wiring line during the ON state. The clock signal of the first shift register has a different phase from the clock signal that controls the fourth thin film transistors, and the duty cycle of each fourth thin film transistor is 12.5% or less.

The patent also mentions that the difference in the number of thin film transistors connecting the selection lines to the wiring line between the first and second shift registers is one or less. Additionally, the thin film transistors of the first shift register and the fourth thin film transistors of the second shift register are alternately turned ON. During each frame period, the thin film transistors are cyclically and sequentially turned ON/OFF, with a floating period between consecutive ON periods where all thin film transistors are turned OFF and the selection lines are in a floating state. The length of the consecutive ON periods is less than or equal to the length of the floating period. The end and start of consecutive ON periods of the thin film transistors substantially match. Finally, all thin film transistors that connect the selection lines to the fixed potential wiring line are controlled by clock signals of different phases.

Overall, this patent describes a display device with improved pixel circuitry that allows for efficient control of thin film transistors and selection lines, resulting in enhanced display performance.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

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.