Television – Video display – Cathode-ray tube
Patent
1996-02-28
1998-05-19
Rogers, Scott
Television
Video display
Cathode-ray tube
2482981, 2483091, 248918, 248924, 359609, H04N 572, A47F 500, G02B 2700
Patent
active
057542597
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an optical filter for visual display terminals, in more detail, a wraparound type optical filter that comprises a frame covering not only the front but also the sides of the visual display terminal, and a filter proper that is provided at a predetermined position in the frame and has nearly the same shape as the display screen of the visual display terminal.
BACKGROUND ART
Visual display terminals using CRTs (cathode ray tubes), liquid crystals, optical fibers, LEDs, etc. have been widely used for computers, various video apparatuses, etc., and variously composed optical filters have been proposed or presented, to be mounted onto these visual display terminals. These visual display terminals can be roughly classified into the flat type for simply covering the front of the visual display terminal, and the above mentioned wraparound type. Of these types, the wraparound type is better because of the advantage that dust, etc. does not enter into the clearance between the visual display terminal and the filter, and also because contrast can be improved since external light does not directly come into the clearance between the visual display terminal and the filter. The Wraparound type also has a further other advantage that since it approximates the visual display terminal in appearance, it has little tendency to give a feeling of incompatibility when it is mounted.
However, since the wraparound type optical filter has its filter proper installed in a frame that is shaped like a relatively shallow rectangular dish, it can be well mounted onto the visual display terminal concerned. However, it can happen that the filter cannot be mounted onto a different visual display terminal, or that the frame is so large in comparison with the visual display terminal as to give a feeling of incompatibility. Therefore, if these undesirable events are to be avoided, many kinds of optical filters need to be specially sized for many kinds of visual display terminals.
To avoid these inconveniences, a filter composed as shown in Japanese Laid-open Patent Application (Kokai) No. 5-219463 (1993 ) is proposed. This filter has a relatively rigid frame having n sides approximating the shape and size of a visual display terminal, with a groove formed in (n-1) sides excluding the bottom side of the frame facing the visual display terminal, and has relatively flexible lip means of selected length corresponding substantially to the peripheral length of the (n-1) sides of the frame. The lip means comprises a tongue extending along the length of the lip means for mating with the frame groove to mount the lip means to the frame, and a rearwardly and inwardly extending relatively flexible concave lip that is joined to the tongue and extending along the length of the lip means to form a generally U-shaped configuration that is open along the bottom of the frame, so that the lip means slides onto the visual display terminal via the open side and into mounting engagement with the sides of the visual display terminal to adapt the bezel to the size of the visual display terminal.
In the filter composed as described in said Japanese Laid-open Patent Application (Kokai) No.5-219463 (1993), since the lip means only is flexible, and the frame is not flexible, the size of the filter as a whole cannot be changed. Therefore, since the filter must be prepared to suit the shape and size of the largest visual display terminal among those intended to have a filter mounted, the filter is inevitably large. If the filter is mounted onto a small visual display terminal, the frame is remarkably larger than the shape and size of the visual display terminal, and gives a feeling of incompatibility to some extent, impairing beautiful appearance. Furthermore, depending on the kind of the visual display terminal, the screen of the visual display terminal may deviate from the filter proper in position. Moreover, since the filter is mounted onto the visual display terminal by the flexibility of the lip means, any impact
REFERENCES:
patent: 4686576 (1987-08-01), Dickie et al.
patent: 4834330 (1989-05-01), Swillinger
patent: 4905089 (1990-02-01), Liang et al.
patent: 5155627 (1992-10-01), Keehn et al.
patent: 5227916 (1993-07-01), Theirl et al.
patent: 5320318 (1994-06-01), Chen
patent: 5543863 (1996-08-01), Lin
patent: 5627606 (1997-05-01), Pember et al.
patent: 5668612 (1997-09-01), Hung
patent: 5689371 (1997-11-01), Butterfield
Matsumoto Hiroshi
Nakamatsu Osamu
Miller Austin R.
Rogers Scott
Toray Industries Inc.
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