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Thin double-sided display based on electron guiding channels

IP.com Disclosure Number: IPCOM000018898D
Publication Date: 2003-Aug-20
Document File: 5 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

ID612485

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Thin double-sided display based on electron guiding channels

    This invention relates to a flat-panel display based on electron guiding channels, here further referred to as channelguide. Figure 1 shows a schematic representation of the channelguide display. The channels are defined between barrier ribs of a substrate plate. An electron beam may be generated from the wire cathode, and led into the channels by electrodes G1, G2, G3. A set of periodic focussing electrodes is arranged perpendicularly to the channels. By applying suitable electric potentials to said periodic focussing electrodes, the electron beam can be guided through the channels. Moreover, the periodic focussing electrodes serve to extract the electron beam from the channel at a desired position. For this, the period focussing electrodes cooperate with the selection electrodes positioned over the channels. The selection electrodes are provided with a number of extraction holes, through which the extracted electron beam passes before reaching a phosphor screen.

Figure 1. Schematic view of the channel guide.

  It appears that the electron guiding channels behave symmetrically with respect to a passing electron beam. That is, the guiding characteristics of the channel are comparable irrespective of whether the beam enters the channel from the bottom or from the top.

  This insight can be advantageously used to construct a display that can be viewed from two sides. Due to the inherent symmetry of the channelguide display has, it is more suitable for constructing a double-sided display than other display types.

  Several applications where a double-sided display can come in handy can be thought of. Here, we given an idea of display applications that come to mind:

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· A two sided television set for at home: If the double-sided television set is positioned somewhere in the middle of the room, two (different) programs can be viewed by different viewers (probably one of the viewers will need a set of headphones). This can be useful when kids are fighting to see a different cartoon, or if the man of the house wants to see football, and the wife wants to see her favourite soap series (or vice versa).

· Video-gaming (multi-player) display: Two players racing against each other, with each racer on a separate side of the screen.

· Computer monitor in a room with 2 (or more) people. One display can be used as a monitor in between two desks, which saves space and costs. See figure below.

· Information desk display: Think of booking a trip at a travelling agency. Usually the client has to lean over the desk to look at the monitor with the flight schedule, hotels reservations, etc.. With a two sided-screen the client can look at the information more easily. The same situation also applies at other places like the bank, etc..

  A schematic representation of how a channelguide display can be used as a double-sided display i...