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Full color patch of performance advantage of SMD display screen
This paper introduces the outdoor full-color patch type the advantages and the screen SMD use special outdoor full-color SMDperformance parameters, help people to understand and display outdoor SMD promotion.
A, this With its high brightness LED display, permanent, large size of large size and families up inside and outside the mainstream of the screen, and display market tube (CRT), liquid crystal display (LCD) and plasma displays (PDP) in small and medium size, indoor close watch on the display market occupy the mainstream.
The led display in the advertisement, the stage, and public information display, traffic facilities, the use of sports field obtained much application. The LED display according to indoor, outdoor environment into and half outdoor LED display; According to display color into monochrome screen, double color screen and a full color; According to choose the device into digital bitmap screen, straight insert the LED screen and patch type SMD screen. This paper tries to narrative is a rising outdoor full-color patch type SMD screen and its special SMD device performance.
Second, outdoor full-color patch of the main advantages of SMD display screen As is known to all, outdoor LED display in one or two years ago all use straight insert the oval red, green and blue leds device, and this one or two years, pixel spacing for 8 mm to 16 mm outdoor full-color patch type is gradually rise, SMD display screen and being widely applied. Before, because of the brightness of the patch SMD low, and waterproof, prevent Tide, uv function can not reach outdoor bad environmental requirements, the outdoor full-color display is straight insert LED components of the world. Full-color display a large patch type SMD only used in indoor. As theLED chip technology and LED packaging technology progress, SMD brightness and protection class has been able to meet the needs of the outdoor applications, and full-color display screen has more patch type SMD full-color straight insert the LED display difficult to achieve some advantage, so obtained a rapid application.
Outdoor full-color patch type SMD screen contrast outdoor straight into elliptic LED display advantages lie in the following aspects:
(1) wide Angle Outdoor full-color patch type SMD screen in a horizontal direction not only have 110 degree wide Angle in vertical direction, also has a 110 degree Angle of view, the wide application in some places special advantage.
(2) good light distribution Red, green, blue oval LED in different angles of three kinds of brightness matching consistency is a difficulty high targets, and full-color SMD because design structure for structure, red, green, and blue chip in all three of a stent bowl, reason in the cup different Angle red, green, and blue three brightness matching consistency height consistent, thus make the outdoor full-color patch in arbitrary Angle of SMD screen brightness of the agreement is very good horse, to achieve better effect of vivid. The following figure 1 and figure 2 respectively for outdoor full-color patch type SMD light distribution curve and outdoor full-color LED light distribution curve elliptical. Through the comparison shows that the light with consistency, SMD LED than elliptic advantages. Figure 1 outdoor full-color SMD horizontal light distribution curve figure 2 outdoor elliptic LED light distribution curve of horizontal direction
(3) mix light good Due to the structure design for, 3 chips are close in the same bracket glass bowl, mix light, not three of the division, the oval LED red, green, and blue light mix good effect in straight into elliptic LED, especially suitable for a closer look at.
(4) high contrast Due to the design of the structure, full-color SMD of small size, light is a small area, black area large area, improve the LED display contrast.
(5) automation production Patch type to be able to use automatic SMD placement machine for automation patch, high production efficiency. Full-color display module patch type SMD line design will be able to realize the lamp board and drive board furniture, reduce the cost, improve the reliability, improve the production efficiency. Automation patch production can still improve SMD at the board in the vertical precision, overcoming the straight insert elliptic LED in PCB vertical accuracy problem, so as to ensure better optical effect.
Three, outdoor full-color patch of the main parameters of SMD (1) brightness At present outdoor full-color patch type SMD brightness already can satisfy the point 8 mm to 16 mm distance between the outdoor full-color patch the brightness of the screen of SMD demand. Among them the green brightness to reach 1200 to 1600, the whole MCD MCD screen brightness to higher than 5000 nits. To ensure the consistency of the whole screen brightness, each color brightness range should be in 3, and the 1:1. Red, green, and blue average brightness ratio is about 3:6:1. (2) wavelength Red, green, and blue all should not be the wavelength range wide, and in 5 nm wavelength distribution of each color should be there were normal distribution. (3) attenuation Outdoor full-color patch type SMD due to reasons to use current relatively high brightness, because in the outdoor use, for minimum attenuation, so on chip size, thermal design, waterproof, ultraviolet high demands. At the same time, red, green, blue three kinds of color brightness attenuation must have the consistency, ensuring that SMD screen in the work a long time not only brightness decline after lesser, and brightness and color to maintain good consistency. Excellent quality of outdoor full-color patch type SMD general can guarantee work 3000 hours after red, green, blue attenuation is less than 5%, and the average of red, green, and blue attenuation discrete below + 10%. (4) Angle Outdoor full-color patch type the Angle of SMD general requirement horizontal and vertical direction were greater than 110 degrees. (5) waterproof and moistureproof Outdoor full-color patch type SMD waterproof and moistureproof property is very important key parameters. The choice of materials and SMD stents structure design decided the waterproof and moistureproof property. New PPA materials, silica gel materials and the design of the new structure can solve problems and waterproof moisture. Waterproof and moistureproof issues not very good solve, can appear failure, dark bright, rapid attenuation. Excellent quality of outdoor full-color patch type of waterproof, dustproof SMD level can reach IP67, moistureproof level for Lever3. (6) and uv protection Due to the requirements for outdoor use, full color patch type of SMD scaffold materials and potting material has resist ultraviolet ability. Do not prevent ultraviolet SMD will appear PPA is yellow, encapsulating materials appear thereby muddy the failure attenuation and brightness. Excellent quality of outdoor full-color patch type SMD in outdoor work 10000 hours after yellowing ratio should be no more than 5%. (7) failure rate Easy to a number of factors in under the action of failure appear. Excellent quality of outdoor full-color patch type SMD within 3000 hours should be below the failure rate (50 PPM) five over one hundred thousand. 0.005% (8) thickness Outdoor full-color display of SMD piece of considering the circuit board waterproof factors, need to be in SMD thickness below the waterproof glue potting, so a full-color patch type SMD need to a certain height, the present market condition mainstream thickness of 2.5 mm.
Four, outdoor full-color patch type SMD the development trend of the display screen
In brightness, cost, the traditional method of outdoor full-color straight insert elliptic LED display in the 20 mm and above pixel spacing is irreplaceable advantage. With the brightness LED chips and LED packaging process technology promotion, outdoor full-color patch type of price and the ellipse SMD LED the gap has narrowed to 10% from 20% to. Outdoor full-color display of SMD piece because it has wide Angle, light distribution, mix light, good contrast high and easy to automatic production the advantages of its market share from now is expected to less than 10% of the development, and outdoor full-color straight to insert elliptic LED display the divide situation.