Lighting, display, LED light source is the three applications, the LED display is one of the three currently among the most mature in terms of technology, product and market applications, technological progress and reduce the cost of industrial development law pushed, LED display industry chain has been completely operating under market conditions link. Have occurred in the past two years as funds poured into the LED industry chain, its effect has demonstrated the mad scramble of the capital resources of the LED application market, the below-cost sales practices. LED display market, despite the number to display for the main business of the screen plant began listing, but also appear more scale screen plant closures phenomenon. This shows that with the cost and competition has heated up the degree of market scramble for resources intensifies, most of the technical characteristics on the market choose to fight the cost of shipping, which lay hidden dangers for scale enterprises closed down. Faced with this situation of intense competition, corporate strategy basically three: one seeking scale operations, enhance the anti-risk capacity; business model is seeking a surprise move; product features to enhance the core competitiveness. Great temptation emerging industry market opportunities, the LED industry practitioners boss impetuous and speculative psychological, and do not want to spend time and effort on the new technology and product development, resulting in the LED display industry pattern and businesses have greater instability . Being in this game, whether we should take countermeasures? To be or not to be? Shakespeare problems appeared.

LED display industry, LED chip is the most important part. Enhance the quality of the LED chip and the proper use of the chip is the most links should work hard.

1.LED chip detection and enhance corporate profitability

The process features of LEDs decided detected throughout the LED industry chain, to occupy a more important role in the downstream detection downstream enterprises with a the good examination link to ensure continued good product.

Actual LED display factory running, cognitive, equipment and cost factors, many enterprises to give up the quality of chip testing, leading to frequent problems screen.

Cognition: LED chip processing and packaging process, according to the wavelength (color), brightness, reverse voltage, leakage current of a number of indicators such as sub-file, the LED lights, electrical indicator detection ordinary diode detector wavelength brightness the photoelectric indicators detect relatively complex chip and packaging plants, in terms of professional sorter display factory testing equipment should be used, such as illuminance colorimeter test of the wavelength of the LED chip and the uneven brightness The above devices the existence of the problem of accuracy and calibration. Illuminance colorimeter screen factory ordinary, such as BM-7 and CL-100, tests show that the precision of the decimal point three, the precision is not enough and can not accurately test the chip wavelength become a problem so that the mix of different batches of chips.

Chip processing and packaging aspects of testing standards: For ordinary LED display chip at the pixel level of the human eye is generally less than 10% change in brightness imperceptible color change 4nm within easy identification, common sub-file standard LED chip less than 20% difference in brightness, color difference within 5nm (sorter or test equipment accuracy guarantee), the screen display is ideal. The same sub-file standard P4 or P3 small pixel pitch screen, the screen is not ideal. Screen within the P4 usually 10% in brightness, color 2.5nm sub-file or chrominance and luminance correction control point by point. Outdoor screen used plug-in lights, in addition to the above discussion of the inconsistencies of color and brightness, there are still angle inconsistencies, such problems should rely on packaging factory to solve in materials and workmanship.

Human eye brightness module imperceptible range at 3%, color 2nm. Once the LED chip mix composed of modules, the normal human eye can perceive differences. Screen factory the different batches chip module try not to mix if the mix, you should chrominance and luminance correction.

For chip factory, packaging plants and even display factory sorting and test equipment calibration problem exists, more feasible way is usually compared with the standard light source, and actual operation, in order to reduce costs and guarantee accuracy, usually with considerable accuracy light source alternative to standard light source, the calibration of the test equipment.