2015-2023 LEDFUL
Why the outdoor LED display chooses the new technology of Common Cathode Energy Saving?

Why the outdoor LED display chooses the new technology of Common Cathode Energy Saving?

Publish Time : Apr 30 2021

As the main method of media communication, display screens have developed rapidly in recent years, especially LED advertising display screens. Many outdoor large screens are now using LED displays. The main reason is that, compared with LCD displays, LED displays can save more energy, have a longer service life, and can achieve the seamless splicing. Because of this, LED displays have gradually replaced LCD displays and become the mainstream of the screen market.
However, for large LED display screens, reducing power consumption has always been a relatively difficult problem to overcome. Although it has saved a lot of energy compared with LCD displays, it is still not enough to meet the market demand. Therefore, after years of hard work, LEDFUL Technology has successfully developed an LED display with Common Cathode Technology, which is what we call LED Energy-saving Screen.
Common Cathode, is an Energy-saving Technology for LED display. It separates the red, green, and blue lamp beads of the display, and then accurately powers it. Its current passes through the lamp beads and then to the negative pole of driving IC, which is opposite of the conventional common anode power supply. So it is called the Common Cathode Power Supply.




Since the current of the common cathode power supply first passes through the lamp beads and then to the driver IC, it avoids the voltage drop of the common anode power supply so that reduces the current loss. In addition, the precise and separate power supply for the red, green, and blue lamp beads can ensure that each lamp bead can work at an excellent voltage. Because different lamp beads require different voltages. Powering it alone can avoid more power loss and improve power utilization. In addition, the reduction in power consumption will also let the display module to generate less heat, ensuring its components have a longer service life.




In addition to the technical parameters that make the Common Cathode LED display different from the conventional display, the most direct and significant advantage that the Common Cathode LED display brings to the operator is to reduce the power consumption of the LED display and reduce the operating cost; Moreover, working characteristics such as low temperature rise can eliminate heat dissipation equipment such as air conditioners and then reduce input costs. Under the condition of ensuring high brightness and high contrast, Common Cathode saves energy to the greatest extent, and at the same time has the advantages of low temperature rise, low heat, low power consumption, long life, and good display effect.




And by adopting the LED display of Common Cathode Technology, its power consumption can be reduced by up to 75%, while the high brightness and high contrast are not damaged. Compared with traditional LED displays, Common Cathode Energy-saving LED displays can reduce more power consumption, generate less heat and in the meantime, have a longer service life and greatly improve power utilization. Especially for outdoor large-size LED displays , It can save a lot of electricity expenses every year. In the long run, the Common Cathode Energy-saving LED screen has a higher rate of return on investment, and is superior to traditional LED screens in terms of display effect, product maintenance, service life, and power utilization.


Below is LEDFUL common cathode LED display test report

Testing Environment Brightness Ambient Temp Air Temp Wind-Force
1500CD 24℃ 16℃-26℃ Gentle Breeze
Testing Requirements Facing the sun and the white balance of the display is 255 gray scales;The brightness is continuously tested under 6500CD.
Test Items 1.The temperature rise test refers to the process in which the temperature of the display screen gradually rises over time.
2. Screen color fading test refers to the change of color gamut parameters such as display brightness, white balance coordinates, color temperature, etc. with temperature changes.
3. The power test refers to the test of the power consumption of the LEDFUL LED display screen.
Temperature Rise Test
Common Cathode Temp Rise Parameter Common Anode Temp Rise Parameter
Initial Temp 36℃
Time Common cathode lamp surface temp/℃ Common cathode PCB temp/℃ Common cathode temp/℃ Time Common anode lamp surface temp/℃ Common anode PCB temp/℃ Common anode temp/℃
3min 41.4 36.5 36.1 3min 59 55.4 56
6min 45.2 37.2 38.5 6min 64.5 54.5 63.3
9min 46.5 37.4 39.6 9min 76.3 64.2 68.5
12min 48.1 37.6 40.8 12min 83.1 63.5 70.4
15min 48.1 37.8 40.8 15min 79.1 64.7 68.5
18min 49.5 37.4 40.9 18min 79.8 68.2 69.3
21min 52.3 38.5 41.3 21min 79.1 68.2 68.1
24min 49.1 38.6 41.5 24min 80.3 68.5 68.7
27min 50.5 38.6 41.6 27min 82.4 70.4 69.4
30min 51 38.7 41.9 30min 81.1 68.5 69
Result analysis: The common cathode solution is about 20 degrees Celsius lower in temperature than the conventional common anode solution.

Screen Color Fading Test
Common cathode chroma parameter Common anode chroma parameter
TIME Common cathode
brightness
Common
cathode X
Common
cathode Y
Common
cathode
color temp
Common anode
brightness
Common
anode X
Common
anode Y
Common anode
color temp
3min 6568 0.2975 0.3222 7474 6561 0.2957 0.3211 7523
6min 6442 0.2969 0.3239 7490 6168 0.2881 0.3263 8023
9min 6209 0.2963 0.3254 7487 6048 0.2864 0.3281 8057
12min 6247 0.2965 0.3256 7479 6041 0.2852 0.3271 8102
15min 6247 0.2969 0.3262 7449 6008 0.2851 0.3261 8122
18min 6321 0.2978 0.3265 7391 6081 0.2847 0.3275 8212
21min 6257 0.2963 0.3274 7462 5981 0.2872 0.3277 8044
24min 6248 0.2967 0.3284 7425 5930 0.2863 0.33275 8079
27min 6210 0.2935 0.3274 7489 5924 0.2852 0.3272 8184
30min 6246 0.2964 0.3276 7460 5906 0.2864 0.3278 8208
Result analysis: The common cathode directly improves the common anode during the continuous rise of temperature. The common anode has obvious fluctuations in color fading (brightness, color gamut, color temperature). And it still maintains color consistency under extreme temperatures.

Power Consumption Test
Supply
voltage
Single board
current
Power factor Power/㎡ (W) Average consumption/㎡ (W)
Common cathode 2.8V+3.8V 2.85A+3.56A 0.72 700 152
Common anode 5V 7.02A 0.67 1030 253
Result analysis: The common cathode improves the power factor to achieve the purpose of increasing the active power, and uses a low voltage (2.8V+3.8V) power supply in the lamp bead power supply to reduce the reactive power of the LED display in use. So as to achieve energy saving of 20%-30%.

Data Graph








Circuit Diagram




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