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A LED display kit manufacturer explains how to measure the brightness of an LED display.
Time:
2022-05-13 14:38
Author:
Web scraping
LED display module manufacturers note that the brightness of white-light‑type LEDs is categorized into several levels and constitutes one of the key performance parameters. Typically, LEDs with a luminous intensity of 1,400–1,600 mcd are used as light sources. However, the quality of LEDs available on the market varies widely, making consistent brightness difficult to guarantee. Since LED display brightness cannot be discerned by the naked eye, how should it be measured?
LED display kit Manufacturers state that the brightness of white-light astigmatic LEDs is categorized into several levels and constitutes one of the key performance parameters. Typically, LEDs with a brightness of 1,400–1,600 mcd are used as the light source. However, the quality of LEDs available on the market varies widely, and their brightness cannot be reliably guaranteed. Since LED display brightness cannot be discerned by the naked eye, how should it be measured?
LED display panel manufacturers state that brightness resolution refers to the range of luminance levels between the darkest and brightest images that the human eye can distinguish. Display panels often feature a very high grayscale, sometimes exceeding 256 levels or even reaching 1,024 levels. However, due to the limited sensitivity of the human eye to brightness, it cannot fully resolve such fine gradations. In other words, under many adjacent gray‑scale values, the human eye perceives them as identical. Moreover, inter‑ocular discrimination capabilities vary from person to person. For displays, naturally, the more distinguishable levels the human eye can perceive, the better—after all, the images displayed are ultimately meant for viewers. The greater the number of discernible brightness levels, the wider the display’s color gamut, and the greater its potential to render rich, vibrant colors. Brightness resolution can be measured using specialized mobile apps; typically, a well‑designed display can achieve around 20 levels, which is considered a respectable figure.
LED display module manufacturers’ analysis of methods for measuring LED display brightness:
1. First, take an LED and illuminate it with a 3V AC source on both sides, ensuring the illuminated end faces and is in close contact with the photosensitive surface of the connected light-dependent resistor. At this point, the digital multimeter will display a reading, allowing you to assess the LED’s brightness.
2. Next, build your own 3V DC regulated power supply to connect the LED; it’s best to use a rechargeable battery. You can use two button cells, mount them inside a small or medium-sized plastic tube, and extend two probes as the positive and negative outputs. Attach a spring‑loaded contact at the tail end to serve as the power switch. To operate, simply touch the positive and negative probes to the LED’s corresponding leads, then press the tail‑mounted switch to light up the LED.
3. Finally, assemble a simple measurement setup using a photoresistor and a digital multimeter. Locate the two thin lead wires on the photoresistor and connect them directly to the multimeter’s two test probes. Set the multimeter to the 20 kΩ range (adjusting it as needed to obtain the most accurate reading for the photoresistor). Note that the displayed value represents the photoresistor’s resistance; therefore, the brighter the sunlight, the lower the reading.
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