Apparatus for testing a light emitting device, and a method for testing light emitting devices

摘要

A test fixture (1) comprises apparatus (4) for verifying the colour 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 fibres (10) adjacent the LEDs (5) on the printed circuit board (3), and ends (21) of the optical fibres (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 colour sensitive pixels (25) onto which light from the optical fibres (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 colour and brightness of the light emitted by the respective LEDs (5).