Light measuring device for a plane light source
AssigneeBenq Corporation
InventorJih-Yung Lu
Life of this patent
Estimating the term…
Abstract
A light-measuring device comprises a photosensor, a light shield and a control device. The light shield has a plurality of apertures. Light from a luminous surface of a plane light source project onto the photosensor through the apertures of the light shield to form a plurality of non-overlapping photosensing areas on the photosensor. Each photosensing area on the photosensor generates a corresponding signal. The control device analyzes the corresponding signals from the photosensing areas to check the light from each corresponding test area on the luminous surface. With the light-measuring device, a tester can adjust the color temperature and brightness values of the plane light source.
Claims12
A light measuring device to measure light radiated from a plane light source, a luminous surface located on a bottom surface of the plane light source, the light measuring device comprising:
- a photosensor located under the plane light source for generating a signal, the photosensor has a photosensitive surface parallel with the luminous surface on the top of the photosensor;
- a light shield made of an opaque material located above the photosensitive surface of the photosensor, the light shield having a plurality of apertures;
- and
- a control device electrically connected to the photosensor, the control device analyzing the signal from the photosensor so that the control device is able to analyze the light from the plane light source;
- wherein the light from the luminous surface of the plane light source projects onto the photosensor through the apertures of the light shield to form a plurality of photosensing areas on the photosensor, each photosensing area having a corresponding test area on the luminous surface, the control device analyzing the signal to check the light from each corresponding test area on the luminous surface.
Dependencies are inferred from the claim text.