Ives patented a slotted screen that split a photo per eye
US patent 725,567 and a Science Museum stereograph confirm Ives' 1903 parallax barrier, the ancestor of today's glasses-free 3D screens.
- Historical event
- April 14, 1903
- First source published
- April 14, 1903
- Site publication
- September 18, 2026
A patent for seeing two images without glasses
Frederic Eugene Ives filed for 'Parallax Stereogram and Process of Making Same' on 25 September 1902 and was granted US patent 725,567 on 14 April 1903. A stereograph by Ives, catalogued by the Science Museum Group as object 1928-249, survives as a physical example of the print type the patent describes, credited to Ives and held under the credit line Gamble, C.W. The patent's own claims describe a transparent-line screen consisting of opaque lines with clear spaces between them, set at a calculated distance in front of a photograph made of two superposed images, one displaced slightly in a lateral direction in respect to the other.
A screen that hides half the picture from each eye
The mechanism is a parallax barrier: a fine grid of opaque lines placed a precise distance in front of an interleaved image. The patent states the spacing is calculated by reason of the parallax of vision with two eyes to make all of the lines belonging to one of the stereoscopic elements visible to one eye only and all belonging to the other stereoscopic element visible to the other eye only. No lenses, glasses or moving parts are needed; the barrier alone hides each strip from the wrong eye, and the two hidden half-images fuse into one scene with depth, provided the viewer's head stays at the barrier's designed distance and roughly on-axis.
What a century-old barrier still costs a viewer
The patent claims a working mechanism, not a comfortable one: because the barrier physically blocks part of the light at every viewing position, a parallax-barrier image is dimmer than an unobstructed print, and moving the head outside the designed zone breaks the eye separation, showing a blurred or crossed image instead of a clean stereo pair. The Science Museum's own record for this stereograph gives no date and minimal description, so it corroborates the print type without adding new historical detail beyond the patent itself.
- Is the barrier or lenticular pitch matched to the intended viewing distance, or borrowed from a different design?
- How much brightness is lost to the opaque lines, and does the display compensate for it?
- How wide is the head-position zone in which the stereo separation actually holds?
The same trade-off Ives patented in 1903, brightness and viewing zone sacrificed for glasses-free separation, reappeared largely unchanged when parallax barriers were built into handheld game console screens a century later.
Sources & reading trail
The patent itself: filing date, grant date, and claims describing the opaque-line screen and interleaved-image mechanism.
Source published: 14 April 1903 · Retrieved: 16 September 2026
Museum record of a surviving Ives parallax stereogram print, confirming Ives as creator of a physical example of the type.
Source published: Not established · Retrieved: 16 September 2026
Primary documents establish the record; the mechanism reading and the demo questions are Presence Atlas editorial analysis. This retrospective draft does not imply the site published on the event date.
Continue reading
- A barrier or a lens decides which pixels reach which eye
- Two flat drawings taught Wheatstone how depth is seen
- Browse the complete the archive
Sources & reading trail
- US725567A - Parallax Stereogram and Process of Making Same
Source published: April 14, 1903 · Retrieved: September 16, 2026 - Ives Parallax Stereogram (Science Museum Group)
Retrieved: September 16, 2026
The documents above establish the record. The reading and the questions are this publication’s editorial analysis, written after the fact.
Published September 18, 2026, not on the date of the event described.