Patent US5444385A successfully refreshed from Google Patents.
US5444385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing apparatus for liquid crystal display substrates
Assignee: Photon Dynamics Inc
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Filing: 1991-09-10
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Granted: 1995-08-22
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Expires: 2011-09-10
Abstract
Abstract A display panel testing apparatus, for observing large areas of a test panel, including an electro-optical element having optical properties that change to form images when an electric field is impressed thereon. The electro-optical element has a first surface facing a test panel that forms the electric field. The first surface and the test panel having a gap therebetween. The display panel testing apparatus also includes a light receptor for receiving the images from the electro-optical element and in particular a second surface of the electro-optical element. The display panel testing apparatus further includes a movable stage and movable mirrors coupled to the movable stage. The movable mirrors are adjustable to direct desired portions of the images onto the light receptor from desired positions of the electro-optical element. The movable stage also allows the movable mirrors to be positioned over the desired portions of the electro-optical element to receive the images portions therefrom.
Inventors
- 👤 Francois J. Henley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/1306; G02F1/1309
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
196 words
In a panel testing apparatus for observing large areas of a test panel comprising an electro-optical element having optical properties that change to form images when an electric field is impressed thereon, said electro-optical element further comprising a first surface facing a test panel that forms said electric field and said first surface and said test panel having a gap therebetween, and a light receptor for receiving desired portions of said images from said electro-optical element and in particular a second surface, said panel testing apparatus comprising: a movable stage means; a movable mirror means coupled to said movable stage means, said movable mirror means being adjustable to direct portions of images onto said light receptor from desired positions of said electro-optical element; and wherein said movable stage means allows said movable mirror means to be positioned over said desired portions of Said electro-optical element to receive said images portions therefrom, and wherein said movable mirror means comprises a first mirror and a second mirror, said first mirror directs said images portions from said electro-optical element to said second mirror, and said second mirror directs said images portions from said first mirror to said light receptor.
Claim 2
Dependent Claim
196 words
In a panel testing apparatus for observing large areas of a test panel comprising an electro-optical element having optical properties that change to form images when an electric field is impressed thereon, said electro-optical element further comprising a first surface facing a test panel that forms said electric field and said first surface and said test panel having a gap therebetween, and a light receptor for receiving desired portions of said images from said electro-optical element and in particular a second surface, said panel testing apparatus comprising: a movable stage means; a movable mirror means coupled to said movable stage means, said movable mirror means being adjustable to direct portions of images onto said light receptor from desired positions of said electro-optical element; and wherein said movable stage means allows said movable mirror means to be positioned over said desired portions of Said electro-optical element to receive said images portions therefrom, and wherein said movable mirror means comprises a first mirror and a second mirror, said first mirror directs said images portions from said electro-optical element to said second mirror, and said second mirror directs said images portions from said first mirror to said light receptor.
Claim 3
Dependent Claim
23 words
The apparatus of claim 1 wherein said movable mirror means adjusts to direct a light from a light source onto said electro-optical element.
Claim 4
Dependent Claim
27 words
The apparatus of claim 2 wherein said light source adjusts to direct said light from said light source to said movable mirror means onto said electro-optical element.
Claim 5
Dependent Claim
12 words
The apparatus of claim 3 wherein said movable mirror means is fixed.
Claim 6
Dependent Claim
21 words
The apparatus of claim 1 wherein said first surface is a front surface and said second surface is a back surface.
Claim 7
Dependent Claim
22 words
The apparatus of claim 1 wherein said movable stage comprises an x-y stage, said x-y stage comprising an x-slider and a y-slider.
Claim 8
Dependent Claim
23 words
The apparatus of claim 1 wherein said movable stage comprises a position detection means, said position detection means comprising a plurality of sensors.
Claim 9
Dependent Claim
20 words
The apparatus of claim 1 wherein said images portions are analyzed by image processing techniques for the presence of defects.
Claim 10
Dependent Claim
13 words
The apparatus of claim 1 wherein said gap is of tens of microns.
Claim 11
Dependent Claim
34 words
The apparatus of claim 1 wherein said light receptor is adjustable to direct portions of said images from said desired positions of said electro-optical element to said movable mirror means onto said light receptor.
Claim 12
Dependent Claim
12 words
The apparatus of claim 1 wherein said movable mirror means is fixed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-21 | 1999-02-20 | 1999-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-21 | 2003-02-20 | 2003-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-21 | 2007-02-20 | 2007-08-22 | $7700.00 | Window Closed / Lapsed |