Patent ID: 7317520
Filing Date: 2008-01-08
Classification: G01J

Abstract:
1. A method for measuring brightness from a perspective of a user of a device having a light-emitting display unit, comprising following steps: (a) providing an apparatus for measuring brightness, the apparatus including a focusing unit converging the light, a sensor unit picking up the wanted light and generating electrical signals which vary with intensity variations of said light, a processing unit performing arithmetic operation to process the electrical signals and to obtain a specific value, and a display unit displaying said specific value; (b) providing a tool platform and locating the apparatus and a device under test having a light-emitting display unit thereon; (c) providing a simulating device, a housing thereof defining a first space filled with a constant color temperature for simulating a working environment of the device under test, and a second space receiving the apparatus and the device under test, sidewalls surrounding the second space having a light-impermeable character; (d) placing the apparatus and the device under test both located on the tool platform into the second space to avoid the external light interfering with the measurement of brightness; (e) activating the device under test and enabling a light-emitting display unit thereof to work; and (f) picking up the light of a specific region of said light-emitting display unit by the sensor unit of the apparatus, and obtaining a maximum brightness value of the picked up light and a minimum brightness value of the picked up light and calculating a difference value between the maximum brightness value and the minimum brightness value by the processing unit of the apparatus, and then displaying said difference value on the display unit of said apparatus; and (g) judging from the perspective of the user whether the difference value exceeds a limit value, if the difference value is larger than said limit value, the tested device is an accepted product; if the difference value is less than said limit value, the tested device is a rejected product.