US 7,607,778 B2Granted

Optotype presenting apparatus

AssigneeNidek Co., Ltd.

InventorTatefumi Oda

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Abstract

An optotype presenting apparatus capable of performing a test with accuracy by minimizing differences in manners an optotype is seen by examinees which result from differences in height of eyes among the examinees comprising a display unit comprising pixels having color filters arranged in a longitudinal direction, a polarization optical member comprising first and second optical regions in the form of a longitudinal line corresponding to the arrangement of the pixels which are alternately arranged in a lateral direction, the regions converting light from the display unit into light having polarizing axes perpendicular to each other, an optotype selecting unit, and a display control unit controlling the pixels corresponding to the first regions to display first optotypes of the optotype to be presented to a right or left eye, and controls the pixels corresponding to the second regions to display second optotypes thereof to be presented to the other eye.

Claims5

Dependent claims

An optotype presenting apparatus comprising:

a display unit comprising pixels arranged in longitudinal and lateral directions, in which R, G and B color filters are arranged in order in the longitudinal direction;
a polarization optical member placed in front of the display unit, which comprises first and second optical regions in the form of a longitudinal line corresponding to the arrangement of the pixels of the display unit in the longitudinal direction, which are alternately arranged in the lateral direction, the first and second optical regions arranged to convert light from the display unit into light having polarizing axes perpendicular to each other;
an optotype selecting unit comprising optotype selecting switches including a switch for selecting a binocular optotype for a binocular vision test;
and
a display control unit which controls the pixels corresponding to the first optical regions to display first optotypes of the binocular optotype which are to be presented to either one of right and left eyes of an examinee, and controls the pixels corresponding to the second optical regions to display second optotypes of the binocular optotype which are to be presented to the other eye.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/213,401Filed 19 Jun 2008
Priority: JP 2007-16527722 Jun 2007
Published: US 2008/0316428 A125 Dec 2008
Granted: 27 Oct 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G02B 30/25
Of the stereoscopic type: using polarisation techniques
A61B 3/032
For testing visual acuity; for determination of refraction, e.g. phoropters: devices for presenting test symbols or characters, e.g. test chart…
H04N 13/324
Image reproducers: colour aspects
H04N 13/337
Displays for viewing with the aid of special glasses or head-mounted displays [HMD]: using polarisation multiplexing

Family

US 2008/0316428 A1Pre-grant publication · published 25 Dec 2008
US 7,607,778 B2This patent

From the US filing history. Foreign family members aren’t listed.

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