Abstract: Provided is an anti-tamper protection circuit including a switch trigger port, a tamper signal transmission port, a power supply unit, and a signal output port. The switch trigger port is connected to a switch, the signal output port is connected to a digital movie server, and the tamper signal transmission port is configured to transmit a tamper signal transmitted to the signal output port through the tamper signal transmission port. In the present disclosure, when an LED display screen is powered off, a battery inside the digital cinema server would continue to power the digital cinema server to maintain proper functioning of the digital cinema server, the power supply unit also powers the anti-tamper protection circuit to guarantee anti-tamper operation of the anti-tamper protection circuit, thereby enabling continuous protection of information security and maintenance of digital copyright, and such that the requirements of information handling standards are satisfied.

Abstract: A spliced LED box body includes at least four LED boxes arranged in rows and columns and spliced with each other, wherein connecting components are provided on opposite adjacent splicing surfaces of the LED box. The connecting components include a first connecting component, a second connecting component, a third connecting component and a fourth connecting component. The first connecting component and third connecting component are arranged on two adjacent side surfaces of the LED box, the second connecting component is arranged on a side surface of the LED box opposite to the first connecting component, and the fourth connecting component is arranged on a side surface of the LED box opposite to the third connecting component. When two adjacent LED boxes are spliced, the first connecting component and the second connecting component are matched and connected, and the third connecting component and the fourth connecting component are matched and connected.

Abstract: A lens structure including a quarter wave plate layer and a linear polarizing plate layer is provided. When the linear polarizing plate layer is located at an outer side of the lens away from a viewer's eye, the polarizing axis of the linear polarizing plate layer is in a vertical direction. The lens structure can be used to make dual-purpose eyeglasses with sunglasses and 3D glasses functions. Any one of the quarter wave plate layer and the linear polarizing plate layer can be disposed at the outer side away from the user's eyes by adjusting the orientation of the lens of the present invention. When the linear polarizing plate layer is located at the outer side away from the user's eyes, the optical axis of the linear polarizing plate layer is in the vertical direction. Thus, the dual-purpose eyeglasses with both sunglasses and 3D glasses functions can be achieved.

Abstract: A stereo projection apparatus includes a polarized beam splitter assembly for splitting a projecting light beam; a polarization state transforming assembly for adjusting the polarization state of the transmitted light beam or the polarization state of the first and second reflective beam; a light path direction adjustment assembly for adjusting a travel direction of the transmitted light beam or a travel direction of the first and the second reflective light beam; a light beam size adjustment assembly for adjusting a coverage range of the transmitted light beam or a coverage range of the first and the second reflective light beam; and a light modulator for modulating the adjusted transmitted light beam, first reflective light beam and second reflective light beam.