LED Panel Diffuser Plate Analysis

 

Diffuser plate in LED panel light is mainly used for wipe off spot and mesh of LGP (light

guide plate), make the light more evenly. Its main material is PC, PMMA, PS, PP. The most

used is PS material.

PC Diffuser Plate

PC
Polycarbonate

Advantage:
1, With high strength and elasticity modulus, high impact strength, extensive using

temperature.
2, High transparency and free of dyeing.
3, High H.D.T. (heat distortion temperature, is refers to plastic under certain pressure,

began to deformation’s temperature.).
4, Good fatigues resistance.
5, Good weather resistance. Weather resistance refers to plastic suffer sunlight,

temperature, wind blowing, rain ect., emerge fading, discoloration, cracks, pulverization

and strength decline ect. a series of ageing phenomena. The ultraviolet radiation is the

key factor make plastic ageing).
6, Tasteless, odourless harmless to the human body, in line with the health and safety.
7, Forming shrinkage rate low, size stability is excellent.

Overall said, stability of PC is the best. Fire rating high, easy to pass the safety

certification. But PC price is quite expensive, and electrostatic is high, easy to absorb

dust in the assembling. And working time consuming cost too much (PC diffuser has

protective film on both sides, some protective film is very difficult to tear, some tore a

piece should be several minutes). The light transmittance rate of PC is relatively low. It

is about 86%.

PMMA
Polymethyl methacrylate
Which we call Acrylate in short

PMMA Diffuser Plate

Advantages and problem in application:

1. Acrylic plate has excellent weatherability, high surface gloss, and good high

temperature performance.
2. Cost low, cheap material and easy molding. In the early LED panel light production,

acrylic is popular.
3. Excellent printing effect. LED panel light is generally relatively simple. So if

customer has need of a large area of screen printing, first choice is acrylic.
4. The flame resistance: Won’t be spontaneous combustion.
5. High light transmittance, can reach 90%. But also trouble about it. We know that LED

panel light is backlit. High transmittance is difficult to hide speckle. It is easy appear

light spot.
6, And acrylic is double sided with protective film, easy to absorb dust, production will

cost time highly.
7. Acrylic is crisp, easy to break.

PS
Polystyrene

PS Diffuser Plate

PS has a very good chemical stability, thermal stability, optical characteristics, strong

refraction, strong electrical insulating, high radiation resistance and little tendency of

moisture absorption. Which can be used in humid environment. It can resist water and dilute

mineral acids. But, at the same time, it is low impact strength, low weather resistance. If

long exposure to outdoor, appear yellow, brittle phenomenon. Its heat resistance is poor,

the deformation temperature is 70-90 °, only can be used in the environment under 70 °.

Low temperature resistant performance is not good, the embrittlement temperature was -30.

PS has many shortcomings, but use for LED panel light, its disadvantages are less obvious,

and its advantages stand out.  LED panel light is generally used in indoor, working

temperature is 20-60. Climatic influence is small.  High refractivity, will wipe off the

lightspot.  It is perfect for indoor using.
On another way, its small static electricity is good for production.  The transmission rate

is 88%, although can’t reach acrylic’s, other advantages can cover this small shortage.

PP
Polypropylene

PP Diffuser Plate

It is new, need some time more to test.

1. Its toughness is admirable, same as PC’s.
2. High light transmittance, can achieve about 90%
3. Small static electricity, less dusty adsorption
4. The main shortage is soft. If we can good to control the faults, maybe will replace PS

material.