Image sensor testing light source system

Abstract

The invention discloses image sensor test light source system, including the light source, the power supply circuit for, it is characterizes in that the light source is LED light source, the system also includes a control circuit, a control signal input port, a LED driver circuit, the control signal input port output connecting control circuit input and output control circuit connecting the input LED drive circuit, the output LED drive circuit connecting the LED light source on. Because of this invention can be controlled through the control input signal input circuit, it can achieve variety of brightness adjustment functions, such as allowing the light source in a certain period of time within certain linear brightness changes, or in a certain period of time to step in jump change.

Description

technical field [0001] The invention relates to a light source system, in particular to a test system used to provide light sources for various test items of the chip in the finished product test of CMOS Image Sensor (CMOS image sensor) chips. Background technique [0002] In the finished product testing process of the CMOS Image Sensor chip, it is necessary to conduct necessary tests on various performances of the chip to check whether the chip can achieve the expected effect at the beginning of the design and evaluate the overall performance of the chip. Among them, dark current, sensitivity, bright field pixels, dark field pixels, etc., are important indicators to measure the quality of a CIS chip. In the past, the light source system for testing these performance indicators generally used light as the light source for testing, and kept the brightness uniformity of the light by intercepting a part of the illuminated area as the illuminated area. If it is in an incandesce...

AI Technical Summary

Problems solved by technology

In the past, the light source system for testing these performance indicators generally used light as the light source for testing, and kept the brightness uniformity of the light by intercepting a part of the illuminated area as the illuminated area. If it is in an incandescent state and emits light, most of its electric energy is converted into heat energy, and only a small part of the energy is converted into light energy, so the power consumption is large and the efficiency is low. The light it emits is panchromatic light, and the monochromatic performance is poor. The temperature is high, the filament is easy to burn out, and the working life is not long; now some people use LED as the light source. Flow particles recombine, release excess energy and cause photon emission to produce visible light. It belongs to cold light source. Under the same lighting effect, the power consumption is only one-eighth of that of incandescent lamp, with low power consumption and high efficiency. The spectrum is narrow, the monochromaticity is good, in addition to not burning out a lot of heat, the LED lamp is small in size, light in weight, encapsulated in epoxy resin, can withstand high-intensity mechanical shock and vibration, and its service life can reach 5 to 10 years

However, using LED as the light source, although the quality of the light source is high, it is inconvenient to adjust the brightness

Images