The viewing angle of LCD displays (1)
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Introduction
In the continuous search for ways to analyze the quality of the displays several times in the recent past I have tried to address the viewing angle, thereby stressing the excessive optimism of some data reported by producers of TV and LCD display technology. Largely because of the lack of appropriate equipment, I could only go into that in recent months.
The viewing angle average reported by various manufacturers of monitors and LCD display by passes around 160 ° both horizontally and vertically but in some cases even comes close to selling 180. By not addressing the discourse on whether to observe the surface of a display at such high angles, which would bring us more in the field of clinical psychology, it is interesting to note that in addition to those values of viewing angles are rarely published parameters within which this angle is determined.
One of the few companies that decided to also publish benchmarks that gave the BenQ is very courageous, some of LCD display technology that were analyzed in order to complete this study. For example, between the technical characteristics of the display FP71GX located here, we read that the viewing angle of 160 ° is within a contrast ratio greater than 5:1.
The contrast ratio of that declared by BenQ display is equivalent to 500:1. This means that watching the display from a side angle of 80 °, contrast ratio down to 5:1. The value measured in terms of default is somewhat smaller (approximately 350:1), but still quite high and the measurement made at an angle of 80 ° is not very far from that stated by BenQ. But it really makes sense to speak of “visibility” with contrast ratios so low?
Before answering this question, as seems good put aside for a moment the contrast ratio and see what the theory tells us about the behavior of the display.
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