Measuring fixture

Abstract

The invention provides a measuring fixture which is used for fixing a circuit board; the measuring fixture comprises a base frame, a wiring plate and an electromagnetic shielding layer, wherein the surface of the base frame is distributed with a plurality of locating holes; the wiring plate is arranged on the base frame; the electromagnetic shielding layer covers the wiring plate, and a wiring channel can be formed. A circuit board is fixed on the base frame by the locating holes, and a circuit connected with the circuit board passes through the wiring channel. By adopting the measuring fixture, electromagnetic interference can be reduced when a liquid crystal display panel is tested, and the measuring fixture is applicable to multiple machines.

Description

technical field [0001] The present invention relates to a measuring fixture, in particular to a measuring fixture capable of eliminating electromagnetic interference and having the function of wire management. Background technique [0002] At present, when performing optical measurement on the LCD TV panel, the measurement fixture is often hung on the back of the LCD panel to fix the driving circuit board. This measurement fixture does not have the function of combing the wires. When performing optical performance measurement, it is easy to connect the AC output line of the drive circuit board and the balance board (Balance Board) and the DC input line for lighting the backlight module. Electromagnetic interference occurs due to being too close, which leads to a significant decrease in the effective value of the current and the measured luminance value of the two wires. Taking a 40-inch LCD TV panel as an example, the luminance reduction value due to electromagnetic interfer...

AI Technical Summary

Problems solved by technology

This measurement fixture does not have the function of combing the wires. When performing optical performance measurement, it is easy to connect the AC output line of the drive circuit board and the balance board (Balance Board) and the DC input line for lighting the backlight module. Electromagnetic interference occurs due to being too close, which leads to a significant decrease in the effective value of the current and the measured luminance value of the two wires. Taking a 40-inch LCD TV panel as an example, the luminance reduction value due to electromagnetic interference exceeds 60 Candela per square meter (nit), which seriously affects the measurement results of optical properties

In addition, the original measurement fixture cannot be used in multiple product models due to the different shape of the drive circuit board. Generally, one model corresponds to one fixture, so the manufacturing cost will increase.

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