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When shopping for the best value, we often rely on familiarity to identify quality in products we use regularly. However, when it comes to purchasing an LED display screen, things become a bit trickier. Since many are not well-versed in LED technology, mistakes are common. This article will guide you through the process of evaluating the quality of LED displays, highlighting nine key factors to consider. The first eleven points apply to general LED displays, while the twelfth focuses on small-pitch models.
A display screen should have a surface flatness within ±1mm to prevent image distortion. A screen that is concave or convex can create blind spots, affecting the viewing experience. The level of flatness is largely determined by the manufacturing process.
For indoor full-color displays, brightness should be at least 800cd/m², while outdoor displays require a minimum of 1500cd/m² to ensure clear images. Low brightness leads to blurry visuals. Brightness is influenced by the quality of the LED chips used, while the viewing angle is determined by how the chips are packaged. A wider viewing angle is always preferable for broader audience visibility.
White balance is critical for accurate color reproduction. A pure white display is achieved when the red, green, and blue components are in the ratio of 1:4.6:0.16. Any deviation from this ratio can cause a shift toward blue or yellowish-green hues. White balance is mainly controlled by the display’s control system, but the LED die also plays a role in color accuracy.
Color accuracy refers to how well the colors on the screen match the original image source. A high-quality display will maintain consistent and realistic colors, ensuring that the visuals are true to life.
Mosaic refers to small, stuck-on bright or dark spots, often caused by poor quality connectors. Dead pixels are individual pixels that remain bright or dark and are typically a result of poor LED chip quality. Both issues affect image quality and should be avoided.
Color blocks are noticeable color differences between adjacent modules. This happens when the control system is ineffective, the grayscale is too low, or the scanning frequency is inadequate. These issues cause color transitions to be noticeable and disrupt the uniformity of the display.
To check the wavelength accuracy, you can display a pure white screen. It should not have any tinge of red or blue, as color deviations indicate problems with materials or production quality. Also, check the red, green, and blue screens individually. A high-quality screen will show standard red, green, and blue under their central wavelengths. The deviation of wavelength should be within 3nm for green and blue, and 5nm for red.
Power consumption refers to the energy used by an LED display per square meter. It’s measured in watts. For example, if a screen consumes 300 watts per square meter, it uses 300 watts of electricity per hour. Maximum power consumption occurs at full brightness, while working consumption occurs during regular operation. You can estimate maximum power consumption by multiplying the number of power supplies by each supply’s maximum output and adjusting for the display’s size.
The refresh rate refers to how many times per second the display updates its image, measured in Hz. A low refresh rate can cause images to flicker or create scanning lines on cameras. A refresh rate above 300Hz is ideal for the human eye to avoid flickering. For video recording, a refresh rate of at least 600Hz is necessary to eliminate scanning lines. A high refresh rate ensures better image quality and color accuracy, which is crucial for displays used in media or live events.
Contrast measures the difference between the brightest white and the darkest black. A high contrast ratio results in more vibrant, eye-catching images, while a low contrast ratio makes the screen look flat and dull. For optimal visual impact, higher contrast ratios are preferred.
If the display's color doesn’t match the original image source, it indicates a color temperature issue. A color temperature between 6500K and 8000K is ideal for normal viewing, while around 5500K is better for broadcasts, ensuring that the image looks natural when recorded by cameras.
For small-pitch displays, low brightness and high gray scale are essential. These displays should have a brightness range between 100cd/m² and 300cd/m², with minimal gray scale loss. High brightness in dark environments can cause visual fatigue, so controlling brightness is important for user comfort. Small-pitch displays should offer low brightness without compromising image quality or gray scale to meet user demands. Displays with excessively high brightness can cause eye strain, which is why keeping brightness within the optimal range is crucial.
Conclusion: When choosing an LED display screen, these 12 factors will help you assess the quality of the product and ensure it meets your needs. For small-pitch displays, focus on low brightness and high gray scale to prevent eye fatigue, while for larger displays, prioritize brightness, viewing angle, and color accuracy. Quality is key to ensuring that your LED screen performs well over time and provides a consistent, high-quality viewing experience.
