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LED panel light technical training material

LED panel lights Overview

 

 
 

 

LED panel lights are similar LCD TV backlight technology, a new type of surface light source, is a high-end interior lighting, the outer frame made of aluminum alloy die-casting or anodized aluminum, the light source is SMD LED lamp beads, whole lighting design gives a beautiful and simple, both good lighting effects, but also brings a feeling of beauty. Unique design LED panel light, the light guide plate after a high light transmittance to form a homogeneous plane glow effect, illuminance uniformity is good, light, soft, comfortable yet bright, can relieve eye fatigue.

 

From green lighting design, LED panel light materials, environmental protection, low power consumption, luminous efficiency, illumination, etc. are superior to Grille, truly lanterns during the day, night lighting. Which is going to replace T8 fluorescent lamp as a light source Grille. Because traditional Grille light utilization is low, only about 65%, while the flat light utilization up to 90%.

 

 

LED panel light part

 

 
 

 

The main structural member panel lights

① Frame: mainly from the cooling effect, usually aluminum

 

② diffusion plate: blocked debris, the light more evenly

 

③ guide plate: change the trajectory of light, evenly arranged

 

④ reflective film: the light guide plate of the light emitted from the front

 

⑤ bottom: auxiliary heat, blocking foreign matter

 

⑥PCBA: LED panel lights, panel light emitting source

 

⑦ Power: drive plate lights

 

The following highlights the diffusion light guide plate aluminum frame

 

1
1The light guide plate presentation
 

 

The light guide plate technology: silk screen and laser RBI,

 

The light guide plate thickness: panel lights do, there are many commonly used thickness, 3mm, 4mm, 6mm, 8mm, the thickness varies, different types, different price difference plate a lot, personally, the light guide plate is the main role of the light guide as long as the light guide high efficiency, high illumination uniformity, long light yellow blistering phenomenon does not occur, the other are the clouds. The current technology, the efficiency of the light guide plate guide screen is the highest, the effect is the best, but the price is the most expensive of these species inside! – Price differences ranging from $ 5-15. The thicker plate illumination, the higher, the market is now more the light guide plate is 4mm, because the plate with 4mm 6mm on the difference between the price of 20-30 yuan.

So in the light guide plate, you must know that you need the kind panel light guide plate and sheet manufacturers of raw materials and the thickness of the light guide plate in which a relatively high water content, the difference between the price difference between the light guide plate around nearly 30 yuan!

The light guide plate material well-known manufacturers: Taiwan's Chi Mei Mitsubishi

Light principle: Fundamentals backlighting.

 

We are now mainly refers to the backlight side emission type backlight, the principle is at the bottom of the light guide plate by adding protrusions or recesses, even stiff brush white reflective point, changing the direction of propagation of the light emitted achieve positive effects of light.

 

Backlight design, a major challenge is to ensure that the goals and to enhance the utilization efficiency of light in the direction perpendicular to the propagation of light, as shown in Figure 1.






1 a schematic diagram of an optical fiber transmission

 

Diffuse light incident on the light guide plate in the conduction process, if encounter astigmatism point, will form all angles, the light energy is spread over the length of the light guide plate changes, so as to ensure uniform light emission, light efficiency to increase with the length of the light guide plate increases, as shown in Figure 2. Proportional to the intensity of the incident light intensity of the diffuse reflected light with the location, the area is proportional to the scattering point. Therefore, in the process of propagation of the incident light, since the diffuse reflection of the incident light so that the intensity gradually weakened, so in order to ensure that both sides of the light guide plate can be uniformly close to this side of the light source scatterers smaller diameter, while the diameter of the other end of the bigger, as shown in Figure 3.

 There are several methods to change the light extraction efficiency: by changing the density of the light guide plate access points, dot size and arrangement pitch outlets and other means. The bottom surface of the light guide plate specific network distribution and the actual LED light distribution curve related to the specific dimensions of the backlight is also related to the key design is to find a rational distribution network in order to obtain a uniform brightness distribution.

 

May be as described above, using optical modeling software, a different set of network parameters, network parameters may be the size or density of two or three dimensional network. To provide the best uniformity of density dots can be displayed, in order to avoid moire fringes, the density of each dot region is not the same. Then Monte Carlo ray tracing method of photometric calculation and simulation, and track the results were analyzed to determine the number of cells of the light guide plate is divided; then, by analyzing the luminance distribution graph outputted by constantly repeated adjustment outlets to optimize the parameters, you can get the final optimum brightness and uniformity.

 

Backlight module structure as shown below:

 2

Diffusion plate presentation:
 

 Refraction occurs when the material separable from its generality PSPMMAPCPP composites are produced plates add special light dispersing agent, to ensure a high light transmittance of the premise, change the emission angle of the incident light so that the light reaches the effective light-emitting surface and scattering to obtain a good light diffusion effect. This material is characterized by high light transmittance so that light can pass through the plate as much as possible, to reach the effective light emitting surface, to avoid being reflected and absorbed, the effective light emitting surface is formed in white light mist cloudy appearance, thereby improving the light efficiency, reduce energy consumption.

 

At this stage do panel lights are used PS material mostly, but also a small amount of other materials, PC prices relatively expensive, over the PMMA, then PS, then the PP, where there are price differences ranging from $ 5-20

 

3
Frame profiles Introduction:
 

 

The frame material is generally 6063 or 6061, the price difference is small, mainly to see the design cross-sectional area size of a frame, a small cross-section of the material to reduce the price is relatively low, the price difference also in the framework of the general 1-3 yuan range. Followed by the rear cover, rear cover thickness varying price is not a commonly used generally with a thickness of 1.0 0.60.8 thickness, now also used iron plate, the price difference of up to ten dollars

 

Contrast panel light program:

 

 
 

 

We focused on LED light into the way, the thickness of the light guide plate, LED spacing respectively LightTools optical design software to do the simulation and optimization.

 

Programme (a) in the light of the total flux from the same situation were unilateral, bilateral, four sides of the light conditions. The light guide plate having a thickness of 4mm; LED spacing of 10mm; Light-side end surface of a smooth vertical section, into the non-light reflective tape affixed to the side.

 

From the comparison of three different parameters of the light way to analyze the efficiency of light into one side of the highest, while the four-side up into the uniformity of light.

 

Scheme (b) of the light guide plate of different thickness: 3mm, 4mm, 5mm situation. From both sides of the LED light; LED spacing of 10mm; Light-side end surface of a smooth vertical section, into the non-light reflective tape side posts

The thickness of the light guide plate from three different simulation results, 4mm thickness uniformity of the light guide plate of the best, followed by the light guide plate of 3mm. In terms of efficiency, the efficiency of the light guide plate 3mm top, 4mm, followed by a light guide plate.

 

Program (three) LED different interval: 5mm, 10mm, 15mm. From both sides of the light source; a light guide plate having a thickness of 4mm; the light side of the end face of a smooth vertical section, into the non-light reflective tape side posts

LED spacing from various simulation results analyzed, the interval of 5mm LED arrangement method can yield the best uniformity. Intervals from 10mm to 15mm, uniformity decreased rapidly.

 

in conclusion

 

In a program, there are three different ways into the light, were unilateral, bilateral and four sides. From the comparison of three different parameters of the incident light mode, the highest efficiency of light into one side, and the uniformity of the top four sides of the light, the incident light on both sides in terms of efficiency and uniformity is average.

 

Option II and Option III in common is that both sides are the LED light. Except that the thickness of the light guide plate and LED arrangement interval. From the comparison of Option II and Option III simulation results point of view, when the light guide plate has a thickness of 4mm, LED interval is the simulation results 5mm, obtained compared to other circumstances, can get better lighting uniformity and efficiency.

 

From the above scenario, we can give two good results. The results of these two methods used are not the same. 1. Two configurations are the sides of the light guide plate of a thickness of 4mm, LED spacing is 5mm. 2. The light unilateral approach, the thickness of the light guide plate of 4mm, LED spacing is 10mm.



Post time: Jul-30-2016

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