Computer graphics processing and selective visual display system – Image superposition by optical means – Operator body-mounted heads-up display
Patent
1998-03-27
2000-06-13
Wu, Xiao
Computer graphics processing and selective visual display system
Image superposition by optical means
Operator body-mounted heads-up display
345 7, G09G 500
Patent
active
060755032
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method of presenting a complete image on the retina of an observer. The image is built-up of a large number of pixels located along mutually adjacent lines starting from at least one line on a display which consecutively shows the pixels in all lines of the image. The line shown on the display is deflected over the whole of the image-perceiving surface of the retina. By image-perceiving surface is meant the area of the retina which sees the image display. The invention also relates to a system for use when carrying out the method.
BACKGROUND OF THE INVENTION
Swedish Patent Specification No. 910778-0 describes a system which can be used to present images with the aid of this principle, among other things. The patent specification describes generally a system for presenting an image on the basis of at least two variables for each pixel, such as pixel position and pixel information. The image is thus comprised of a plurality of pixels, each defined by a pixel position given by two angular coordinates in relation to a reference direction from the observer, and by information relating to each pixel with regard to intensity, color, polarization, etc., at each moment in time.
The novel principle disclosed in the aforesaid patent specification enables the image presentation system, or display, to be divided into two parts. More specifically, the system or display may be divided into a first display device located at a distance from the observer, and a second display device located in the field of view between the observer and the first display device. It is also necessary for the presentation system to include means for mutually synchronizing the first and the second display devices.
According to the aforesaid patent specification, when imaging with the aid of two mutually separate display devices, these devices can be provided with different combinations of the three variables X-coordinate, Y-coordinate and pixel information, such as intensity, color, polarization, etc. A total of six combinations are possible for dividing these variables between the two display devices.
SUMMARY OF THE INVENTION
The present invention is concerned with simplifications to the equipment required with some of these combinations, particularly those combinations in which the display device which is located at a distance from the observer is provided with information relating to the X-coordinate of respective pixels, with or without pixel information. This display device will thus display a line which consecutively shows the pixels in all lines of the image or picture. The line may be orientated in desired directions and be comprised of uniformly illuminated pixels or pixels that contain information relating to intensity, color, polarization, etc. This display can thus be a so-called line display. The display may also be constructed for simultaneous presentation of one or more groups of preferably mutually adjacent lines.
It is therewith necessary to provide the second display device, which is conveniently carried by the observer in the form of spectacles (goggles) through which the line display can be viewed, with means for deflecting the observed line or lines in the opposite direction, which is suitably perpendicular to the propagation of the line, so that a complete image will be "painted" over the retina of the observer. It is thus only on the retina that the image exists in its entirety as a mean value formulation over a maximum time period corresponding to the slowness or integration time of the eye.
In the case of present-day standard video formats in TV-technology, the image, or half-image, is normally generated in so-called interlace format, line-by-line uniformly in time.
In the case of a deflecting means based on a mirror periscope, for instance, in which a mirror is caused to oscillate in time with requisite line-by-line deflection, it is necessary for the mirror to move linearly with time during each image sweep. The time to the next image or half-image is ex
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Celsiustech Electronics AB
Wu Xiao
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