LED flat light luminescence uniformity

LED flat light of another important indicator is the uniformity of the glow, common standard GT004 - on both sides 2012 general indoor lighting lamps and lanterns of LED flat-panel brightness uniformity ( luminanceuniformity） Requirements, refers to the minimum brightness and brightness light-emitting surface of lamps and lanterns the ratio of arithmetic average.

as LED flat light, the nonuniformity of light will lead to a panel display brightness uniformity is differ, discomfort caused by the human eye perception. According to the GT004 - 2012 standard requirements, the brightness of the LED lamps and lanterns of tablet uniformity should not be less than 0. 8. Test method is mainly according to the size of the screen, select the appropriate test point, measure the luminance values of each point. Generally considered uniform performance of 80% or more of the human eye perception is little impact.

tablet the brightness uniformity test of lamps and lanterns is the first time the surface brightness of indoor lamps and lanterns are put forward in the standard requirements. It embodies flat characteristic parameters of lamps and lanterns, is one of the important characteristics of this kind of lamps and lanterns. In indoor lighting, light lamps build simple soft lighting effect is other bracket of lamps and lanterns or grille lamps and lanterns is irreplaceable.

in indoor lighting, with fluorescent lamps and lanterns of the diffuser is also has face glowing effect, have been used for many years, but can not reach the brightness of the LED lamps and lanterns of tablet evenness level.

because of fluorescent tube is omnidirectional light emitting light source, unable to adjust the brightness of the optical system to better evenness, and the level of efficiency of lamps and lanterns is 40 lm/W. And LED lamps and lanterns is half space lighting, within the lamps and lanterns, high utilization rate of light, the lamps and lanterns efficiency can reach more than 80 lm/W, and luminance uniformity can achieve a higher level.

use light side structure LED flat light, LED tube is arranged in the side of the guide plate, the visual effect of lamps and lanterns is better. At present most domestic manufacturers still use printing type as a light component of light guide plate, use a variety of density, size of diffusion, make uniform glow of light guide plate, in order to obtain good luminescence uniformity.

from the test results, small size LED flat panel lamp brightness uniformity is easy to meet the requirements, even if the uniformity is a little deviation, human eyes not easily also feel out on it. Large-area LED flat light, sometimes because of quality problems appeared on the brightness of light guide plate is not uniformity, and into the light of the above process causes the light band, or visible partial dark space phenomenon.

so, diffuser, and the reflection of light guide plate paper, etc. The choice of main raw material to quality evaluation, and the raw materials into the factory to strictly control the production enterprise shall be equipped with necessary optical brightness meter and light transmittance test instruments.

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