An article to easily understand the impact of different dimming curves on dimming effects
When we open the specification of LED driver power supply, we often see the word "dimming curve". The dimming curve is an important existence in the dimming process. It determines the changing characteristics of the light from dark to bright and from bright to dark, and directly affects the dimming effect.
After receiving the input signal, the dimming device will output light according to a predetermined function, which is the dimming curve.There are many kinds of dimming curves. Linear, logarithmic and gamma dimming curves are the more common ones. The following will introduce these three dimming curves in detail.
Under the linear dimming curve, the dimming signal is proportional to the change in light brightness, that is, if the dimming signal increases by 10%, the light brightness will also increase by 10%, and vice versa. Generally speaking, linear dimming curves may be more convenient in places where precise brightness control is required (such as exhibitions, studios, etc.).Linear dimming curve
The linear dimming curve is simple and intuitive, and it is easier for users to understand and control the brightness of the light. However, linear dimming does not always conform to the visual perception of the human eye, because the human eye is very sensitive to changes in light at low brightness, and can easily capture even a slight increase in brightness, while at high brightness, the human eye is relatively insensitive to changes in light.
Logarithmic dimming curveIn order to adapt to the visual characteristics of the human eye, the logarithmic dimming curve came into being. Different from the linear dimming curve, the light brightness changes slowly at low brightness, and the transition is more natural; at high brightness, the light brightness changes quickly and is not easily noticed by the human eye, which is more in line with the perception characteristics of the human eye. Because it is more in line with the visual habits of the human eye, the logarithmic dimming curve is widely used in lighting design, especially in scenes that need to improve the dimming effect of the light and meet the visual perception of the human eye.Logarithmic dimming curve
Gamma dimming curve
The gamma curve describes the nonlinear relationship between the brightness signal and the display brightness and human eye perception. By properly adjusting the Gamma value, the brightness distribution of the lighting area can be optimized, making the brightness more uniform and softer, and reducing glare and shadow phenomena.
The gamma dimming curve does not have only one curve change. In fact, it represents a series of curves. When the Gamma value is equal to 1.0, the curve is a straight line that is 45° to the coordinate axis, which is the linear dimming curve mentioned above.
Gamma2.2曲线图
After observing the different effects of different Gamma values on the dimming curve, we will find such a feature: assuming that the part of the curve with a horizontal coordinate less than 30% is the dark area, the larger the Gamma value, the smoother the change of the dark area, and the smaller the Gamma value, the steeper the change of the dark area.
The larger the Gamma valuethe smoother the change in the dark area
The smaller the Gamma value,
the steeper the change in the dark area
Exponential dimming curveIn the exponential dimming curve, the light brightness is exponentially related to the input signal. As the input signal increases, the light brightness increases more slowly in the low power area and faster in the high power area.
The exponential curve is also a dimming curve that conforms to the perception characteristics of the human eye, because it lights up slowly at low brightness, brightens suddenly in the latter part, and changes rapidly in the high brightness area, which is not easily detected by the human eye and conforms to the perception characteristics of the human eye.
Comparison of four dimming curves
Why do we need to apply different dimming curves?
Meet the more delicate dimming needs of different dark areasBy applying different dimming curves, the special requirements of dark area lighting can be better met. For example, in specific places such as museums, dark areas often require more delicate lighting control, which can ensure that visitors can see the details of the exhibits more clearly without damaging the exhibits due to excessive light.
When the dimming stroke of the dimmer is not linear with the output brightness signal, if you want the light output to change linearly, a different dimming curve is required.
Through the above explanation, I believe everyone has a preliminary understanding of dimming curves. Now, let's return the theory to practical application. With the continuous advancement of technology, users have put forward higher requirements for the convenience of dimming curve application.
As a professional Chinese manufacturer of intelligent dimming drivers, SCPOWER/Suretron has achieved customization of dimming curves through technological innovation, effectively meeting users' application needs for dimming curves.
High-Power Constant Current Dimmable LED Driver
Allows users to customize dimming curves
Taking SCPOWER/Suretron constant current high-power series intelligent dimming driver as an example, this series can select linear, logarithmic or gamma dimming curve through the NFC function, allowing users to flexibly select the most suitable dimming curve according to the specific application environment, lighting requirements or personal preferences.ill carefully preset a variety of dimming curve schemes based on the actual application scenarios, lighting needs or personal preferences of different customers, saving customers the tedious self-debugging steps, effectively saving users' time and energy, and ensuring the accuracy of dimming, effectively improving lighting effects.
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