Abstract: The disclosure relates to a detecting system including a terahertz wave source, a detector and a controlling computer. The terahertz wave source includes a terahertz reflection klystron including an electron emission unit, a resonance unit, an output unit. The electron emission unit is configured to emit electrons. The resonance unit includes a resonant cavity communicated with the electron emission unit so that the electron emission unit emit electrons into the resonant cavity. The resonant cavity of the electron emission unit opposite the cavity wall has an output aperture coupled. The output unit is communicated with the resonance unit by the output aperture coupled. The resonance unit generate terahertz wave transmit to the output unit by the output aperture coupled.

Abstract: The disclosure relates to a detecting system including a terahertz wave source, a detector and a controlling computer. The terahertz wave source includes a terahertz reflection klystron including an electron emission unit, a resonance unit, an output unit. The electron emission unit is configured to emit electrons. The resonance unit includes a resonant cavity communicated with the electron emission unit so that the electron emission unit emit electrons into the resonant cavity. The resonant cavity of the electron emission unit opposite the cavity wall has an output aperture coupled. The output unit is communicated with the resonance unit by the output aperture coupled. The resonance unit generate terahertz wave transmit to the output unit by the output aperture coupled.

Abstract: A field emission display includes a panel and a control unit. The panel has a number of pixel units. Each of the pixel units has at least one fluorescent layer. The control unit which electrically connects to the pixel units receives an objective image. The control unit further selects a part of the pixel units corresponding to the objective image, divides the part of the pixel units into a number of pixel unit groups, and scans the pixel unit groups to make the plurality of pixel unit groups sequentially work such that the panel displays the objective image.

Abstract: A field emission display includes a panel and a control unit. The panel has a number of pixel units. Each of the pixel units has at least one fluorescent layer. The control unit which electrically connects to the pixel units receives an objective image. The control unit further selects a part of the pixel units corresponding to the objective image, divides the part of the pixel units into a number of pixel unit groups, and scans the pixel unit groups to make the plurality of pixel unit groups sequentially work such that the panel displays the objective image.

Abstract: A double-faced light emitting diode display includes a pair of parallel shield panels (20, 20?), and a light emitting module (30) located between the shield panels. Each shield panel includes a video contrast enhancement assembly. The light emitting module includes an opaque insulative substrate (31) with a pair of pixel matrixes symmetrically formed on opposite surfaces (310, 310?) thereof and a circuit driving system formed at at least one of the surfaces. Each pixel matrix includes a plurality of pixel units (320, 320?). Symmetrically opposite pairs of pixel units are electrically interconnected so that the shield panels can simultaneously display same images. The double-faced light emitting diode display has a simple structure, a small size, low cost and full color display capability, and can be advantageously applied in traffic signal boards, large-scale display boards, surround cinemas and so on.

Abstract: A double-faced plasma display panel includes two parallel viewing screens (20, 20?), and a discharge structure (30) located between the viewing screens. Each viewing screen includes a transparent substrate (21, 21?), with a plurality of transparent electrodes (23, 24, 23?, 24?), a transparent dielectric layer (22, 22?), and a protection layer (25, 25?) formed at an inner surface of the transparent substrate. The discharge structure includes an opaque insulative substrate (31), with a plurality of addressing electrodes (37, 37?), an opaque dielectric layer (38, 38?), a plurality of separation walls (39, 39?), and a fluorescent layer (40, 40?) formed at each of opposite surfaces (310, 310?) thereof. Symmetrically opposite pairs of same electrodes are electrically interconnected so that the viewing screens can simultaneous display a same image. Only a single driving system is needed to achieve the simultaneous display.

Abstract: A double-faced field emission display device includes two parallel fluorescent screens (10, 10?) and an electron emission structure (20) located between the fluorescent screens. Each fluorescent screen includes a transparent substrate (21, 21?) with an anode plate (12, 12?) and coplanar fluorescent layers (13, 13?) formed at an inner surface of the transparent substrate. The electron emission structure includes an opaque insulative substrate (28) with cathode plates (26, 26?), electron emitters (27, 27?) and grid plates (25, 25?) formed at each of opposite surfaces (281, 282) thereof. Symmetrically opposite pairs of same electrodes are electrically interconnected so that the fluorescent screens can simultaneous display a same image. Only a single driving system is needed to achieve the simultaneous display.

Abstract: A double-faced light emitting diode display includes a pair of parallel shield panels (20, 20?), and a light emitting module (30) located between the shield panels. Each shield panel includes a video contrast enhancement assembly. The light emitting module includes an opaque insulative substrate (31) with a pair of pixel matrixes symmetrically formed on opposite surfaces (310, 310?) thereof and a circuit driving system formed at at least one of the surfaces. Each pixel matrix includes a plurality of pixel units (320, 320?). Symmetrically opposite pairs of pixel units are electrically interconnected so that the shield panels can simultaneously display same images. The double-faced light emitting diode display has a simple structure, a small size, low cost and full color display capability, and can be advantageously applied in traffic signal boards, large-scale display boards, surround cinemas and so on.

Abstract: A double-faced plasma display panel includes two parallel viewing screens (20, 20?), and a discharge structure (30) located between the viewing screens. Each viewing screen includes a transparent substrate (21, 21?), with a plurality of transparent electrodes (23, 24, 23?, 24?), a transparent dielectric layer (22, 22?), and a protection layer (25, 25?) formed at an inner surface of the transparent substrate. The discharge structure includes an opaque insulative substrate (31), with a plurality of addressing electrodes (37, 37?), an opaque dielectric layer (38, 38?), a plurality of separation walls (39, 39?), and a fluorescent layer (40, 40?) formed at each of opposite surfaces (310, 310?) thereof. Symmetrically opposite pairs of same electrodes are electrically interconnected so that the viewing screens can simultaneous display a same image. Only a single driving system is needed to achieve the simultaneous display.

Abstract: A double-faced field emission display device includes two parallel fluorescent screens (10, 10?) and an electron emission structure (20) located between the fluorescent screens. Each fluorescent screen includes a transparent substrate (21, 21?) with an anode plate (12, 12?) and coplanar fluorescent layers (13, 13?) formed at an inner surface of the transparent substrate. The electron emission structure includes an opaque insulative substrate (28) with cathode plates (26, 26?), electron emitters (27, 27?) and grid plates (25, 25?) formed at each of opposite surfaces (281, 282) thereof. Symmetrically opposite pairs of same electrodes are electrically interconnected so that the fluorescent screens can simultaneous display a same image. Only a single driving system is needed to achieve the simultaneous display.