Computer graphics processing and selective visual display system – Single display system having stacked superimposed display... – Three-dimensional arrays
Patent
1998-07-06
2000-04-04
Chow, Dennis-Doon
Computer graphics processing and selective visual display system
Single display system having stacked superimposed display...
Three-dimensional arrays
345 87, 40743, G09G 500
Patent
active
06046710&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a border for a display device as defined in the preamble of claim 1.
When an observer views a substantially planar image (such as that formed on a television screen or a painting) the brain identifies a number of visual cues which lead to the realisation that a substantially planar image is being viewed. Such flatness cues tend to contradict depth cues, such as perspective, which may be present in the image itself.
In order to make such an image appear more three dimensional, a body forming a border as described in the first paragraph may be used. Such a body is disclosed in U.S. Pat. No. 3,582,961. In this known border the first and her patterns are formed by dark stripes on a transparent lamina. When viewed together in transmission the patterns produce a resultant Moire interference fringe pattern. When this known border is superimposed upon the peripheral edges of a pictorial image displayed on, for example, a projection screen, the flatness cues associated with the edges of the flat screen are suppressed. An illusion of depth in the image is created from monocular depth cues (e.g. perspective and obscuration) which may be present in the flat image. Such depth cues are discussed in, for example, the paper by Harold Schlosberg in the American Journal of Psychology, Volume 54, Number 4 October 1941 pp 601-605.
There are a number of disadvantages associated with the body of U.S. Pat. No. 3,582,961. For example, the patterns are one dimensional, so that motion parallax will only occur when an observer moves his or her head in a specific direction. The patterns are fixed and it is therefore difficult to alter the apparent distance between the plane of the border and the resultant pattern, other than by substitution of the original body with a different body or by physically moving one pattern.
SUMMARY OF THE INVENTION
According to the invention, there is provided a border for a display as defined in the claims. This provides the ability to vary the appearance and/or the position or plane of the resultant pattern without replacing or moving the whole body.
The presence of Moire interference fringes in liquid crystal panels used for displays is well known and is generally considered to be a disadvantage of these displays. The inventors have realised that this disadvantage with known liquid crystal panels can be used to provide an improved border which helps create apparent depth in a substantially planar image.
The patterns are advantageously arranged such that the resultant pattern exhibits motion parallax in a plurality of directions.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings in which;
FIG. 1 shows a cross-section of a first embodiment of a border according to the invention,
FIG. 2 shows a cross section of a second embodiment of a border,
FIG. 3 shows a first pattern and two further patterns according to the invention together with the respective resultant patterns, and
FIG. 4 shows other sets of patterns according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT(S)
FIG. 1 shows an apparatus forming a border (1) for au image (2). The border comprises a first pattern (3) and a further pattern (4) superimposed on but spaced from the first pattern, the patterns comprise usually contrasting areas, overlying portions of the first pattern and the further pattern are such as to form a resultant pattern (5) which appears to lie in front of and/or behind the plane of the border (6). In the present example, the first pattern comprises a fixed pattern as shown in FIG. 3(a). The pattern is composed of areas of black ink (10) printed onto a transparent acetate sheet (11) such as an overhead view foil. The black ink areas are printed at a resolution of 600 dots per square inch so that some areas appear black and opaque whilst other areas appear transparent. Thus the pattern comprises visually contrasting areas. In the present example the ac
REFERENCES:
patent: 3582961 (1971-06-01), Shindo
patent: 3701581 (1972-10-01), Henkes, Jr.
patent: 4335936 (1982-06-01), Nonomura et al.
patent: 4953949 (1990-09-01), Dallas
Holden John
Parry Gareth
Central Research Laboratories Limited
Chow Dennis-Doon
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