The leaves of the normal plants in the greenhouse during the fruiting period of the greenhouse were thick and flat, lacking deep carvings, and pointed apexes. The types and causes of leaf abnormalities are described below.
1, the blade is large, thin, round, shallow nick, petiole length, the angle between the petiole and the stem is less than 45 degrees, the angle between the blade and the petiole is large. The reason is that the night temperature is high, especially after the middle of the night, the temperature is high, the moisture is high, and the nitrogen is sufficient and the light is shining.
2. The angle between the petiole and the stem is large, the angle between the leaf blade and the petiole is small, the leaf blade is drooping, the petiole is short, and the leaf is dark in color. The reason is the low temperature and lack of water.
3, large leaves, swollen leaves, transverse diameter greater than vertical diameter, leaf margin curled backward, thick veins, pale. The reason is that the temperature is low and the soil moisture is high.
4, leaf color light green, thin leaves, long leaves, leaves stretch uneven, slightly spoon-shaped, petiole specialty, sagging, brittle or longitudinal cracking, easy to break. The reason is that the temperature is high and the soil moisture is high.
5, small leaves, dark green color, slow growth, leaf blade apex tipped or twisted to one side like virus symptoms, stem segments are also short. The reason is that the temperature is low and the soil moisture is low.
6, the blade is large, the tip does not stretch, the color yellow and green dull, sometimes there are yellow-green circles around the leaf edge, stem top growth is not smooth. The reason is that the temperature is high and the soil is dry.
7. The leaf margins of the upper and middle leaves are neatly gilded. The mesophyll tissues are generally not necrotic and the upper leaves become smaller suddenly. Some of the leaf margins are revolute in a parachute-like shape, the leaves are dark green, the growth points are tight, and the roots are rust-colored. Tip blunt. The reason for this is excessive fertilizer and excessive concentration of soil solution.
8. Yellowing of leaves or veins between leaves, and then dry, while the veins are still green, the boundaries between diseased and healthy parts are clear. The cause is ammonia poisoning.
9. In the early morning, the edge of the leaves resembles a water scald. The leaves have polygonal or dot-like water stains that return to normal after sunrise. The reason for this is that the protected area is closed for too long, the ventilation is insufficient, the ground temperature is high, the temperature is low, the humidity is high, the leaf transpiration is inhibited, the leaf cells are saturated with water, and the water flows into the cells.
10. The yellow leaves of the lower part of the early stage turn white and fall off, and the plants grow slowly. The reason is that the humidity is too low.
11, young leaves shrink, yellow leaves; appear "Netherlands celery leaves" shaped deformed leaves, also known as "acidic viral disease." The reason is that the pH value of the soil is too low, the acidity is strong, or the unfermented organic fertilizer is applied in a large amount.
12, pale yellow leaves become pale, even white, thin stems, crisp. The reason is the lack of nitrogen.
13. The mesophyll is copper-colored, and the main vein sinks, especially the older leaves. The reason is the lack of potassium.
14. The growth of young leaves is not normal, the buds are clustered and the growth is inhibited. The reason is zinc deficiency.
15. The leaf margins of young leaves turn red first and gradually expand to the inside. White and transparent rot spots appear between the veins. In severe cases, most interveinal veins are chlorotic, the veins are still green; the plants are dwarfed, the internodes are short, the top is heavier, and tender The leaves are rolled upwards, the old leaves are bent downwards, and finally the plants gradually die from top to bottom. The flower is yellow-white and the melon is small and odorless. The cause is calcium deficiency.
P25 full-color display module, the so-called interface mainly refers to a drive mode required by the display, which can be 75 interface, 12 interface, or your specific interface definition, display drive mode, display scan Way, and a driving method to turn on the light. The interface of our P25 dual-color display module uses 12 Port, not port 75.
Process flow of P25 two-color display module-AI automated production:
The designed circuit board is produced, then all the driver ICs are attached, all the corresponding LEDs are prepared, and then the assembly line is ready to start the operation, the AI vertical machine starts to insert the lights, the DIP starts, and all the LEDs Knit the tape, then put it in the Universal vertical machine, start to insert the LED directly, according to the set procedure, insert the entire LED board
After all the completed P25 dual-color display modules have passed the company's quality management inspection, and there are no problems, the product is put into wave soldering, and then all the LED pins are soldered, using environmentally friendly lead-free Tin
3. The process flow of P25 two-color display module-quality inspection
All the soldered full-color display modules begin to work on the assembly line. All accessories, such as the angle of the signal line of the line driver, and various power sockets, and the entire light board, if there are any, crooked The oblique LED lamp bead will right and level the LED lamp bead for comprehensive inspection.
Our P25 two-color display module all use the JX5020 driver chip from Taiwan Macroblock. The LED of each branch has a corresponding IC pin driver, and one IC pin drives one LED. We use The static cross-current driving method ensures that the current of each IC can be guaranteed, and it will not cause the entire module to heat up due to the different scanning methods, resulting in damage to the IC, and the brightness of the LED. Static cross flow is related, and the static cross flow drive ensures the stability of the entire screen.
When all the LED display modules are tested, paste QC, pass, and then perform the first semi-finished product test aging. The longer the aging time, the better, let him exceed 24 hours as much as possible, and then we will display the display module , Put on the bottom shell, ready to start pouring
Process flow of P25 two-color display module-mechanical glue filling:
The glue filling adopts a fully automatic glue filling machine. After the ab component glue is combined, the filling is carried out according to the ratio of 10:1. It is best not to lower or increase the ratio. The ratio of 10:1 is just right. , It can be surface-dried in about two hours, and the glue will dry out in about 4-6 hours. This glue will have a good guarantee for long-term use.
After the module is filled with glue, place the module on a horizontal plane, and test with a level meter, and then try to make each module as flat as possible, complete the 4 corners of the horizontal position on the same level, the choice of AB glue It is also very important. The AB glue choice must use more than 40 yuan per kilogram of glue. Its adhesion and durability will be very good. It cannot be filled with shoddy glue. It will crack after a long time. The screen will leak.
Then put all the display modules in the mask and arrange them to start packaging
P25 full color display module application:
It can be used in a single module or in a combination of multiple modules. When multiple modules are used in combination, the positive pole of the power cord between the two modules is connected to the positive pole (red), and the negative pole is connected to the negative pole (black); the signal passes Signal line docking,.
P31.25 dual pornographic newspaper board LED display module is widely used in traffic guidance and related application fields in highways, tunnels, urban roads, major highways, road network dense areas, urban highways, streets, airports, docks, stations, etc.
The P31.25 dual pornographic report board LED display module has the characteristics of high water resistance, high luminous efficiency and long service life. Its display effect is good, the color is bright, the brightness is high, and the viewing distance is long. It is very suitable for use as an outdoor traffic variable information screen and outdoor advertising screen.
P31.25 LED lamp package shape: 546 elliptical plug-in lamp Drive mode: static drive with constant current source
Pixel pitch: 31.25mm Displayable colors: ten thousand colors
Screen brightness: ≥6500cd, frame changing frequency ≥60HZ
Color temperature: 5000-8500 (K) Refresh frequency ≥600HZ
Luminous wavelength: red 625nm; green light 520nm; blue light 470nm
Video format: synchronized with the video source
Core Origin: Red Tube Epistar 9*9: Green Silan 13*13
Machine operating platform: WINDOWS98, NT, 2000, XP
Horizontal viewing angle "110 degrees Pixel density: 1024 dots
Vertical viewing angle: 60 degrees
Pixel composition: 4 red 2 green 2 blue
**Viewing distance: 25~300m
Unit specifications: width 250mm × height 250mm
Cabinet size: 500×500×90mm Unit weight: 1.125kg
Box weight: 45kg
Working voltage: AC220V±10%
Power consumption＜40W/㎡ Material: anti-static, anti-acid and alkali
Transmission distance
When using super five network cable; when >100m, using light environment
Temperature: -10℃~+40℃
Protection level: front IP65/ip21
Continuous working time: ≥72 hours
The P33.33 outdoor full-color plug-in LED display module has the characteristics of high water resistance, high luminous efficiency and long service life. Its display effect is good, the color is bright, the brightness is high, and the viewing distance is long. It is very suitable for use as an outdoor traffic variable information screen and outdoor advertising screen.
P33.33 Outdoor full-color plug-in light LED display module product features
★ High brightness: using LEDs with the highest brightness, it is still clearly visible at a long distance under strong sunlight;
★ High uniformity: the color uniformity of the display screen**, the display screen is more delicate;
★ Good flatness: The flatness of the module mounting surface is required to be controlled within plus or minus 0.1mm;
★ Good effect: using nonlinear correction technology, the image is clearer and the sense of hierarchy is stronger;
★ Patented mask: unique downward tilt angle design to reduce waste and increase the effective viewing angle;
★ Strong reliability: adopting multiple scanning technologies and modular design technology, higher reliability and stability;
★ Stable circuit board: The circuit board adopts wave soldering process and has a green oil oxygen barrier to prevent moisture and oxidation of the circuit and improve the service life;
★ Three anti-corrosion paint: protect the circuit board and related equipment from environmental erosion; it has good resistance to high and low temperature; it forms a transparent protective film after curing, which has excellent insulation, moisture resistance, leakage resistance, shock resistance, and Dust, anti-corrosion, anti-aging, corona resistance and other properties;
★ Waterproof glue filling: the automatic glue filling machine is used to fill the glue to ensure that the module is filled evenly, smoothly and has good waterproofness;
★ Strict testing: The product has passed a series of strict inspection and testing measures, such as raw material testing, production process testing, finished product aging testing, etc.;
P33.33 outdoor full-color plug-in LED display modules are widely used in traffic guidance and related applications in highways, tunnels, urban roads, major highways, dense road networks, urban roads, streets, airports, docks, stations, etc. field.
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Shenzhen Wide Way Optoelectronics Co., Ltd. , https://www.wdmtrafficlight.com