Display product technology development mature, along with the rational consumption of consumers, the demand for the display is not only the characteristics of its features, more and more attention. For this change in the needs of users, we in the current LCD display market also saw more product features, functions and other demand-oriented innovation change.
For the 2011 LED display quality improvement in several areas, the domestic focus on LCD monitoring, large-screen mosaic system engineering design R & D brand Jinxin An electronic to the author introduced the following aspects.
1, brightness and perspective
Brightness is an important indicator of the display, the display brightness depends mainly on the led luminous intensity and LED in the display on the arrangement of density. According to the SJ / T11141-2003 standard of the Ministry of Information Industry, the brightness is defined as the luminous intensity per unit area of the LED display. When the brightness of the viewing direction is reduced to one half of the brightness of the LED display normal direction, the angle between the two viewing directions and the normal direction of the same plane is divided into horizontal and vertical viewing angles. Display color display with single color, dual color and full color, the use of the environment there are two categories: indoor display and outdoor display, the two parameters of the selection and requirements are also different. Indoor full color of the brightness to 800cd / m2 or more, outdoor full color brightness to 1,500cd / m2 or more, in order to basically guarantee the normal operation of the display image brightness. In recent years, LED in the substrate, epitaxy, chip and packaging aspects of new technologies after another, especially the use of indium tin oxide materials, current expansion layer technology and process stability and maturity, so that LED luminous efficiency has been substantial improve. At present, most outdoor full-color display horizontal angle of view can be greater than 120 °, vertical viewing angle greater than 45 °, in the pixel pitch of 16mm, full-color display white balance brightness greater than 6,000cd / m2, pixel pitch of 20mm, full color Display white balance brightness can reach 5,500cd / m2 or more, the display can work in all environments around the clock.
2, uniformity and clarity
LED display uniformity has three indicators: pixel light uniformity, showing the brightness uniformity of the module and the module brightness uniformity. As the test pixel light intensity uniformity to remove the LED tube from the display, the process is complex, and may also damage the tube, so the display test module or module generally choose the brightness uniformity as an assessment index. Module brightness uniformity refers to the same display in the module between the brightness of the consistency between each other has become a measure of the merits of the display of one of the most important indicators.
3, display pixels
Pixel out of control is divided into two types of blind spots and often bright spots. Blind spots, that is, blind spots, when the need to light it is not bright, called blind spots; often bright spots, when the need to light up it has been lit, called the bright spot. For monochrome, the two colors are better understood, for full color, RGB any one of the lights out of control, we think that this pixel out of control. Pixel out of control rate is divided into the entire screen pixel out of control rate and regional pixel out of control rate. The whole screen pixel out of control rate is equal to the whole screen blind spots and the whole screen and the number of bright spots and the ratio of the number of pixels. In addition, in order to avoid out of control pixels in a certain area, the standard proposed "regional pixel out of control rate", that is, 100 × 100 pixel area, the number of pixels out of control and the total number of pixels in the region ratio.
4, environmental protection and safety requirements
As the display can be applied in different occasions, so the display also has some security requirements. The main safety indicators specified by the standard are grounded, the earth leakage current, electrical strength, temperature rise four indicators. LED outdoor display with a much higher than the amount of indoor screen, indoor display on the environmental requirements of the lower requirements of the outdoor display on the environmental adaptability requirements are much higher. As a result of different regions, the environment is not the same, outdoor display should be able to withstand the long-term impact of harsh environments, that can wind, rain, earthquake, but also in high and low temperature environment can also be used normally.
Jinxin An enterprise in the field of high-end display program has a wealth of practical experience. For a long time, the enterprise by virtue of the outstanding team of pragmatic and passionate, the product has won many well-known enterprises in the industry and customer recognition. I believe that the introduction of products with the field of introduction has a certain degree of professionalism and readability.