Apparatus for testing a light emitting device, and a method for testing light emitting devices
US7056000B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2001 |
| Grant date | Jun 6, 2006 |
| Priority date | — |
| Expiry date | Feb 12, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2001/4252
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A text fixture (1) comprises apparatus (4) for verifying the color and brightness of light emitted from LEDs (5) of a printed circuit board (3). A base (6) of the fixture (1) supports the printed circuit board (3) during testing. A mounting panel (14) locates ends (15) of a plurality of optical fibers (10) adjacent the LEDs (5) on the printed circuit board (3), and ends (21) of ht optical fibers (10) are terminated in a terminating panel (20) adjacent an image sensing panel (11). The image sensing panel (11) comprises an array of individually addressable light and color sensitive pixels (25) onto which light from the optical fibers (10) is incident. An analysing circuit (12) scans the pixels (25) for determining the brightness values and the tristimulus values of the incident light, and a control circuit (9) compares the tristimulus values and brightness values with reference tristimulus and brightness values for verifying the color and brightness of the light emitted by the respective LEDs (5).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.