The rapid development of display technology has seen a gradually maturing narrow pitch display technology. This is particularly true when pixel pitches between module and driver IC are shrinking, the demand for new forms of optical tests has arisen. The R&D team at Apacer (8271) was the first to propose a design with a removable micro diameter light shield tube to effectively resolve measurement challenges due to the limited measurement range of a single driver IC and a single LED module. It has opened up a new world for fine pitch LED optical tests. In comparison wi...