The rapid evolution of display technology has led to a compelling question: does increasing display parameters actually enhance the human visual experience? Micro LED technology may hold the answer.
Samsung explored this question with an experiment focused on resolution. They discovered that when the human eye reaches 60 cycles per degree (cpd), the benefits of a higher resolution become less noticeable. While higher resolution (from 2K to 4K, and 4K to 8K) can enhance image quality, it also affects sharpness and clarity. Consequently, the experiment controlled elements such as edge enhancement, brightness, contrast, and color range to compare the display quality gap between a 4K HDR Micro LED, an 8K QLED, and an OLED.
About the Experiment
Three different images were used in this experiment: two monochrome and one multicolored with detailed nuances. These images were adjusted by manipulating four attributes: edge sharpening, brightness, contrast, and color range. The experiment involved 20 participants, all with 20/20/20 vision or better.

Due to the distinct driving methods of each display, measurements were taken using a flat illuminance meter on the test images. The minimum and maximum brightness values for each display were: Micro LED 6.3×10-10 to 1888.37 cd/m², QLED 1.2×10-7 to 576.22 cd/m², and OLED 7.7×10-10 to 217.77 cd/m². The Micro LED displayed the broadest brightness range.

Findings
Edge Clarity
When comparing a 4K Micro LED to an 8K television, the difference in image quality due to edge blurring or sharpening was not significant. Even with blurred edges, the HDR display of the Micro LED was subjectively rated as having clearer and superior image quality.

Contrast
Contrast differences had a notable impact. When contrast was reduced by 10%, both the 8K television and the Micro LED produced similar contrast effects. However, at a 20% reduction, the higher-resolution display offered a clearer image. When contrast was increased by 10%, the perceived clarity improved only slightly.

Color Range
As the color range expanded, the image quality of the Micro LED also improved. Similar to contrast, when clarity decreased by 20%, the Micro LED was less effective than the higher-resolution display. However, the difference was not as significant as with contrast. It can be expected that as the color range continues to increase, the Micro LED’s performance will enhance, playing a key role in boosting overall image quality.

Brightness
In the brightness evaluation, each image was measured using a light meter, and the highest level of pixel line brightness on the retinal image was used to determine each display’s response. This showed that the Micro LED could be viewed more effectively in brighter environments, underlining its strength in contrast between light and dark areas. This ability is perhaps the clearest explanation for why the Micro LED is perceived to have superior clarity.

Conclusion
This study used subjective evaluation methods to compare the image quality of HDR 4K and LDR 8K displays. When the resolution surpasses 60 cpd, brightness and contrast become more crucial factors in perceived image quality. However, a clearer subjective impression does not always equate to overall superior image quality, and HDR also plays a pivotal role in enhancing display performance.
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