
The display is also afraid of ‘heatstroke’ in the day of three volts?
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- Time of issue:2024-06-11 15:42
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(Summary description)Since the beginning of summer, many places issued a high temperature warning, the highest temperature in local areas can reach 39 ℃. In the heat wave swept, can not stand the high temperature is not only people, even all kinds of displays are the same ‘old crime’.
The display is also afraid of ‘heatstroke’ in the day of three volts?
(Summary description)Since the beginning of summer, many places issued a high temperature warning, the highest temperature in local areas can reach 39 ℃. In the heat wave swept, can not stand the high temperature is not only people, even all kinds of displays are the same ‘old crime’.
- Categories:News
- Author:
- Origin:
- Time of issue:2024-06-11 15:42
- Views:
As soon as the summer, LED display encountered a headwind bureau.
Since the beginning of summer, many places issued a high temperature warning, the highest temperature in local areas can reach 39 ℃. In the heat wave swept, can not stand the high temperature is not only people, even all kinds of displays are the same ‘old crime’.
PART-01
Display, also afraid of too much ‘heat’
In the public's impression, most electronic products, are afraid of being in extreme environments, such as extreme low or high temperatures, are like a ‘talisman’, not only to limit the performance of the product, but also damage to the internal devices.
Therefore, ‘fever’ has become a problem that electronic products need to be solved, and displays are no exception, and they need to deal with ‘baking test’ from high temperature all the time.
The normal use of LED displays outdoors requires a certain temperature range, usually between -20 °C and 65 °C. In fact, extreme temperatures of 65 °C or more are not recommended.
In fact, extreme temperatures above 65 °C are rare - after all, even ants can't survive for more than 3 seconds - but don't forget that, in addition to the external heat, the LED display itself also generates heat.
▲ Display consists of tens of thousands of semiconductor light-emitting diode pixels evenly spaced.
The LED display consists of tens of thousands of lamps, these dense pixels will not only emit light, but also heat, long time running, the heat itself will be very large, coupled with the external high temperature, the overall temperature of the display will be rising.
In this ‘table’ temperature, fried eggs can only be considered a piece of cake, if the LED display itself is poor heat dissipation, then all aspects of performance will decline, can be said to be a whole body.
PART-02
What is the impact of high temperature?
As mentioned above, the working temperature of LED display has a certain upper limit, when the temperature exceeds the chip's carrying temperature, it will affect the display effect of LED display.
Specifically, the impact of high temperature on LED display is mainly in the following four aspects:
(1) produce obvious light decay
(2) reduce the luminous efficiency
(3) causing cracks in the packaging material
(4) affect the wavelength of light (light colour)
First of all, what is the light failure, light failure refers to the LED after a period of time after the light, its light intensity than the initial light intensity will be reduced, and can not be restored, that is, the part of the reduction is called the LED light failure.
Commonly speaking, the life of a person is measured by time, and the life of the LED display is measured by light decay. Under normal circumstances, there is a certain time limit for light degradation, which is called the life cycle of a product in Internet slang, and the environment of extreme high temperature is equivalent to the ‘accelerator’ of the life cycle of a product, which will accelerate the process.
As a matter of fact, there are many reasons that lead to the light decay of LED displays, but the most critical one is still the heat problem.
In addition, high temperature will have a negative impact on the packaging materials and light colour of the LED display. For example, most of the encapsulation materials for LED modules are based on epoxy resin, which is generally used at a temperature of no more than 125 ℃, when the temperature exceeds the threshold, it will quickly ‘strike’, resulting in cracking and failure of the LED display.
In addition, in different temperature conditions, red, green, blue three light brightness attenuation and decline is different, 25 ℃ when its white balance is normal, but at 60 ℃ when the brightness of the three colours have declined, and its attenuation value is inconsistent, so high temperatures may produce the whole screen brightness decline and off-colour phenomenon.
From the external packaging materials, to the internal chip and the luminous body, high temperature for LED display is the impact of all aspects. If you can't solve the heat dissipation problem in time, then the result can be imagined.
PART-03
Guide to preventing heat in LED display
In order to adapt to the high temperature of the external environment, the human body has two main ways: sweating and breathing. LED displays also have ways to dissipate heat to cope with high temperatures.
The basic principle of heat dissipation is to discharge the heat generated inside the LED display in time to keep the air temperature inside the screen and the working temperature of the device in the normal requirement range.
Usually, indoor LED displays are low in brightness and generate less heat, plus they can also ‘dabble with air conditioning’, so they mostly use natural heat dissipation.
In contrast, outdoor LED displays have higher heat dissipation requirements than indoor displays due to their high brightness and heat generation. There are several common ways to dissipate heat:
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