Discussion on plane (lattice) light source test

Preface

Along with the increasing market demand for innovative products, raw materials and product technology itself, the demand for new products continue to follow up, the increase of plane light source types, processing requirements gradually improve, increasingly stringent quality requirements, the increasingly fierce market competition. This requires the plane light source (DOT) manufacturers need to purchase advanced production and testing equipment in product R & D and production process, analysis of the product with the scientific method, in order to win in the fierce market competition in a space for one person.

This paper aims at the author's plane (DOT) to understand the source and field test equipment R & D application experience to be a summary of several planes, hoping to give the majority (DOT) plane light source manufacturers and manufacturers using a point of reference, to promote the development of the industry, make some contribution to the progress of science and technology in china.

Common plane (lattice) light source

Planar (dot matrix) light source is more involved in the industry, the following from several typical classes for some simple introduction.

- LCD display industry: such as flat panel displays, used for instrument display LCD, mobile phone screen etc..

- vision image recognition: such as FL surface light source backlight used for lighting, linear image sensor LI strip light source etc..

- LED large screen display: such as LED8*8, 16*16 and 32*32 dot matrix display module, digital tube etc..

- automotive electronics industry: such as car dashboard display, car DVD display etc..

5 toys, gifts, etc.: now there are a lot of toys and gifts will be embedded in LED and other light source to achieve good results.

Standard test requirements for planar (lattice) light sources

The defect detection point, product display missing segment etc.

Electrical parameter testing, such as power consumption, test of characteristic parameters of the device used

Photometric measurement, such as brightness, luminous flux, luminance, photometric uniformity and other parameters

Test method for measuring plane (dot matrix) light source, such as primary color wavelength, white field color coordinate, color uniformity, etc.

Get rid of the eye comparison test of electric parameter test, the human eye is in the middle of 1990s, due to the lack of industry standards and basic means of testing, usually only by the human eye, the feel of photometric and colorimetric evaluation, even today, because of the expensive test equipment or engineers for science test method is not enough to understand, the human eye is still widely used in. The human visual comparison method, due to the differences of human and human factors at random, apparently very hard in the factory and the factory between users and reach a unified standard, it is difficult to guarantee the consistency of all products, can provide scientific data for excellent products.

Therefore, the comparison of the human eye is the most unscientific means of testing, long-term use of the rise of the enterprise is very unfavorable.

There are many kinds of conventional instruments used in conventional instruments, and there are a lot of equipment manufacturers.

Dead, missing segment can check through the intelligent power + light inspection machine + eye to achieve electrical parameters detection by voltmeter, ammeter, electromagnetic test instrument, the photometric illuminance meter, spectrophotometer and color, can be realized by spectrometer.

As can be seen from the above, the use of conventional instruments will have three important problems:

Many kinds of instruments, because of the difference of the equipment manufacturer and instrument testing method of performance indicators, especially in luminosity and chroma has been the lack of a unified industry standard is not unified, to reproduce the measured standard and between different manufacturers and customers, it will bring many problems to the enterprises in the actual operation process.

Test platform is complex, the enterprise to buy the instrument back, to meet their needs for a certain test, we must design a good test platform, coupled with the instrument to test. In fact, this will bring a great burden to the enterprise.

The test result is not the final result, but also needs a large number of subsequent data processing to get the final parameters of the product. If there is no relevant professional talent, it is more trouble. Therefore, the conventional instrument testing is much more scientific than the human eye, but the need to invest in human, material resources are relatively large, the most important in the whole process of uncertainty is still a lot of.

Integrated intelligent instrument is called integrated intelligent instruments, refers to the test object most parameters or some important parameters of the integrated comparison of automated testing on a platform, and the formation of users of the final data needed in the whole process of the test report, few people of the operation for automated testing.

Integrated intelligent process is through the analysis of the test object, test design, the single test instrument together, the system information integration and data processing through the embedded software and computer software.

The test block diagram is as follows:

Such instruments as early as the end of 90s, the German IS company has a similar product, such as the following system can be completed on the dashboard of the photometric and colorimetric test, such devices are generally more expensive.

This kind of instrument development later in China, nearly two years in the initial stage, currently only a model for the integrated test system of ZWL-3600 plane light source is a light, more comprehensive color and electrical integrated testing system, this system is relatively advanced technology, rapid test, accurate, convenient, some car manufacturers, manufacturers, DVD light source LCD manufacturers in the use of the following is the software interface