What’s the Key Component for the Small Pixel Pitch LED Display Screen
At present indoor splicing micro spacing of LED large screen market splicing screen, DLP rear projection splicing screen, LCD splicing screen three-cent world, including micro spacing LED splicing screen is the momentum is strong, its no flat-fell seam, high brightness, high gray level, high contrast, long service life, is unmatched by another stitching screen, also recognized by the market, quickly take indoor splicing of a large market share. And the micro spacing LED splice screen is so good that it can’t be separated from the micro spaced-led manufacturing. The LED light beads are used.
Ubiquitous LED light beads
The spacing of the LED display screen LED lamp bead is used most, affect the micro distance LED display effect is one of the largest components, leds for indoor micro spacing applications, LED lamp bead currently use brunet, gold wire bonding more table triad SMD lamp beads. LED lamp beads are the key components of micro-spacing LED display, for three reasons:
LED lamp beads are the most-used components of micro-spacing LED display, taking P1.6 micro-spacing LED display as an example, with up to 360,000 use per square meter.
The performance indexes of LED light bead directly affect the performance of micro-spacing LED display, which affects the viewer’s evaluation of the display screen.
LED bulbs account for the largest proportion of the total cost of micro spaced LED displays, up to 30 to 70 percent.
The influence of LED lamp bead on micro-spacing LED display
1. The brightness impact of the LED display will depend on the size of the incoming LED lights and the brightness performance of the LED light beads. Micro LED lamp beads using the electric current, the greater the distance between the greater the luminous intensity of LED display, high quality LED lights with good light conversion rate, and the use of tiny electric current can emit light of high brightness, to save electricity, maintain stable micro spacing LED display is good.
2, the impact on the rate of out of control due to micro spacing LED display by tens of thousands or even hundreds of thousands of set of red, green, blue three kinds of LED pixels, any color LED display screen overall failure will affect the visual result. Generally speaking, according to industry experience, at the beginning of the LED display assembly to age failure rate of 72 hours before delivery should be no more than three over ten thousand (referring to the LED lamp bead itself causes of the failure), high quality LED lights, the failure rate is very low, using high quality LED lamp bead micro distance between the LED display screen the whole control rate can be controlled under one over one hundred thousand.
3, affect the service life of LED lights, the theory of life of 100000 hours, far more than the distance between the working life of the LED display other components, so the right LED lamp bead quality guarantee, the working current, reasonable PCB thermal design, the display production process is rigorous, LED lamp bead will be display one of the most durable parts of the machine, using high quality LED lights, small spacing LED display service life of up to 100000 hours, average trouble-free working hours (MTBF) of up to 50000 hours.
4. The view of the influence of the lens from the Angle of the LED display is determined by the Angle of the LED lamp. At present, the indoor display screens are mostly horizontal/vertical LED light beads, which make micro-spacing LED display horizontally/vertically to reach 160 degrees.
5. The influence of the spacing of the pixel points affects the pixel spacing of the LED display and the resolution of the whole screen. SMD0707 type LED lamp is mainly used with small spacing LED display, under P1.5 SMD1010 type LED lamp bead is mainly used for P1.6, P1.9 P2.0 micro spacing, LED display, SMD2121 type LED lamp bead is mainly used for P2.5, P3 micro distance between the LED display screen. Under the premise of constant point spacing, the size of the LED lamp bead increases, which can increase the display area and reduce the grain sense, but because the area of the black area is reduced, the contrast will be reduced. On the contrary, the size of the LED lamp decreases, the display area is reduced, the particle sense increases, the black area increases, and the contrast is increased.
6, consistency of brightness/color/white balance the effect of distance between micro-LED display is composed of thousands of red, green and blue leds of pixels, each color LED brightness, the wavelength determines the whole screen brightness consistency, the consistency of the white balance consistency, color uniformity. In general, the manufacturer of display device vendor for 5 nm wavelength range and 1:1. The scope of the brightness of the 3 LED lamp bead, these indicators can be made of classification through the testing machine can achieve device supplier.
Since LED light beads are angled, the light-spaced LED display also has a directional orientation, which means that when viewed from different angles, the brightness is increasing or decreasing. In this way, the Angle consistency of red, green and blue LEDs will seriously affect the consistency of white balance in different angles and directly affect the fidelity of video color on the display screen. To be red, green, blue three kinds of LED brightness changes when matching consistency in different angles, encapsulated lens design, choice of raw materials is needed in the strict scientific design, this depends on the technical level packaging suppliers. If the Angle of the LED lamp is not consistent, the white balance effect of the whole screen will be bad. The Angle consistency of LED lamp bead can be measured by LED Angle comprehensive tester, which is especially important for medium and high – grade display.
7. The influence of the LED lamp bead on the anti-static ability is a semiconductor device, which is sensitive to static electricity, which can easily lead to electrostatic failure. Therefore, the anti-static ability is very important to the life of the display screen. The high quality LED lamp can withstand the test voltage of 50Hz, 1500V (ac effective value) for 1 minute without insulation breakdown.
8. The influence of the LED display on the attenuation characteristics will be caused by the decrease in brightness and the color of the display, mainly due to the attenuation of the brightness of the LED lights. The decrease of the brightness of the LED lamp will reduce the screen brightness. The inconsistencies of red, green, and blue LED brightness attenuation will result in the inconsistency of the color of LED display, which is what we often call the display. High quality LED light can control the brightness attenuation well. By 1000 hours at room temperature light 20 ma standards, attenuation should be less than 2%, red, blue, green attenuation should be less than 10%, in blue, green LED display screen design as far as possible not to use when 20 ma current, had better use only 70% to 80% of the rated current. In addition to the characteristics of red, green and blue LEDs, attenuation is affected by the use of current, PCB heat dissipation design, and ambient temperature of the display.
The characteristics of LED lamp beads
1. 4-pin RGB package and the chip is arranged in a straight line;
2. Use black packaging substrate to improve color contrast;
3. Lightweight, single LED weight to 1.0 mg;
4. Realize all-black RGB package; Light loss 25%;
5. The minimum size 0.5 * 0.5mm RGB package can be realized;
6. The surface of the product is treated with fog, and the screen is softer.
7. Adopt silica gel pressing technology to improve product temperature resistance, UV resistance and stress resistance.
The advantages of micro-spacing LED display with high quality LED lights are:
Brightness 0 ~ 1200cd/m2 adjustable;
Has a 160-degree horizontal/vertical super-wide Angle;
The overall loss of control is one in 100,000;
Have 100,000 hours of super-long service life;
The average working time is up to 50,000 hours;
The brightness uniformity is not less than 98%;
Chromaticity uniformity plus or minus 0.003 Cx, within Cy;
With a high of 99% light utilization;
Power consumption is less than half that of DLP and LCD;
Energy-saving and environmental protection, easy maintenance;
With such outstanding performance, LED light beads have won the approval of the majority of users.