Qisda has been granted a patent for a light source module that includes a phase retardation layer, two light sources, two Polarization Beam Splitter (PBS) layers, and two redirectors. The module is designed to convert the linear polarization direction of polarized light and allow certain polarized light to travel through while reflecting others. The light sources emit polarized light with different colors. GlobalData’s report on Qisda 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 Qisda, Drone gimbals was a key innovation area identified from patents. Qisda's grant share as of September 2023 was 54%. Grant share is based on the ratio of number of grants to total number of patents.
A light source module with polarization conversion and reflection
A recently granted patent (Publication Number: US11774840B2) describes a light source module that includes various components to control the polarization and color of emitted light. The module consists of a first phase retardation layer positioned on a symmetry axis, along with two light sources that emit polarized light in different linear polarization directions. The module also includes two Polarization Beam Splitter (PBS) layers, two refraction layers, and two light redirector layers.
The first phase retardation layer converts the linear polarization direction of the first polarized light emitted by the first light source into the linear polarization direction of the second polarized light emitted by the second light source. The PBS layers allow light with the first linear polarization direction to pass through but reflect light with the second linear polarization direction. The light redirector layers reflect light with the second linear polarization direction. Importantly, the first and second polarized lights have different colors.
The optical paths of the first polarized light emitted by the first light source and the second light source are different. The first polarized light emitted by the first light source travels through the first PBS layer, the first phase retardation layer, and the second PBS layer. On the other hand, the first polarized light emitted by the second light source travels through the second PBS layer, the first phase retardation layer, and the first PBS layer.
Similarly, the optical paths of the second polarized light emitted by the first light source and the second light source are also different. The second polarized light emitted by the first light source travels through the first light redirector layer and the first PBS layer, while the second polarized light emitted by the second light source travels through the second light redirector layer and the second PBS layer.
The light source module also includes prisms, additional PBS layers, and a prism opposite to the symmetry axis. These components further control the polarization and direction of the emitted light.
Overall, this patented light source module offers a versatile and controlled way to manipulate the polarization and color of light emitted by the module's light sources. The various layers and components work together to achieve the desired polarization and color characteristics of the emitted light.
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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.
