LEDs are widely valued and rapidly developed, and are inextricably linked to their own advantages. These advantages are summarized as follows: high brightness, low operating voltage, low power consumption, miniaturization, long life, shock resistance and stable performance. The development prospects of LED are extremely broad, and are currently developing towards higher brightness, higher weather resistance, higher luminous density, higher uniformity of illumination, reliability, and full color.
First, the type of LED display
1, according to color classification
Single primary color display: single red or single green; two-color display: red and green double primary colors, 256 levels of gray, can display 65,536 colors; full color display: red, green, blue three primary colors, 256 grayscale The full color display can display more than 16 million colors.
2, according to the composition of the pixel unit classification
Digital display: display pixel is a 7-segment digital tube, suitable for making clock screen, interest rate screen, etc.;
Graphic display: display pixel is a dot matrix module , suitable for playing text and image information;
Video display: The display pixel is composed of many light-emitting diodes, which can display various video files such as video and animation.
3, according to the use of location classification
Indoor display: small light-emitting point, dense pixel spacing, suitable for close-up viewing;
Semi-outdoor display: between indoors and outdoors, not rainproof, suitable for information guidance at the threshold;
Outdoor display: large luminous point, large pixel spacing, high brightness, can work in the sun, with wind, rain and water resistance, suitable for long distance viewing.
4. According to the driving method, there are static, horizontal scrolling, vertical scrolling and page turning display.
Second, the types of LEDs used in display screens
According to the classification of the display, the pixel LEDs used can also be divided into the following types:
1, dot matrix module
Advantages: low cost, mature processing technology, stable quality; disadvantages: poor control of brightness and color consistency, prone to Marsag phenomenon;
2, straight light
Advantages: better color consistency control, pixel spacing can be freely adjusted according to needs; Disadvantages: red, green and blue mixed color is not good, angle is not large, it is not easy to control the consistency of the angle, the processing is prone to high and low, up and down Easy to misplace;
3, the patch
Advantages: display color, color mixing effect, angle consistency, etc. are the best; disadvantages: packaging, processing and other high costs;
Third, LED packaging technology requirements for display
Different application locations will use different specifications of the display screen, different display screens need LED devices with different technical requirements, then what are the technical requirements for the LEDs used in the display, the following are explained according to different classifications:
1. SMD LED for indoor display.
The SMD LEDs for indoor display screens are further divided into “three-in-one†and “three-in-oneâ€, among which the former is used for relatively low-cost, and the display requirements are not high, and the latter has better display effect and relatively lower cost. High, the following is mainly to explain some "three in one";
(1) Brightness: The first thing to consider is the proper proportion of the brightness of the product. At present, the red, green and blue brightness of most full-color displays are matched by 3:6:1 (that is, the red brightness of a pixel is 30%, green). The proportion of 60% and blue is 10%. Generally speaking, the package manufacturers and upstream chip manufacturers almost all test products according to 20mA, but the real application to the display is almost not the current driving LED lights. Generally speaking, the three types of red, green and blue LEDs are different in the material of the wafer. They are not proportional to the heat generation, luminescence and brightness attenuation in actual use. Generally, the red attenuation ratio is smaller, and the blue-green attenuation is larger. Therefore, in order to ensure that the display life of the display is relatively long, the designer will generally lower the blue-green drive current than red; for example: if the red is driven by 18mA, the green is driven by 15mA, and the blue is driven by 12mA, according to the LED. Wafer IV-If relationship:
Roughly we can figure out the actual brightness of the LEDs needed, the relationship between red, green and blue is:R: 3÷90%
G: 6÷75%
B: 1÷60%
At the same time, the brightness should be binned. The purpose of the binning is to make the display screen not to let the naked eye see the difference in brightness. Generally speaking, the brightness difference of the human eye can be more sensitive. The difference is 30%. Equipment test error and installation mechanism error, design splitting is better according to 10%~20%.
(2) Color: According to the optical effect, the white light is decomposed into a plurality of colors gradually transitioning through the prism, and the colors are red, orange, yellow, green, cyan, blue, and purple, which is the visible spectrum. The human eye is most sensitive to red, green and blue. The human eye is like a three-color receiver system. Most of the colors can be synthesized in different proportions by red, green and blue. Similarly, most of the monochromatic light can be decomposed into red, green and blue.
This is the most basic principle of colorimetry, that is, the principle of three primary colors. The three primary colors are independent of each other, and no one of the two primary colors can be combined with the other two colors. Red, green and blue are the three primary colors, and the three colors are the most widely synthesized. The red, green and blue primary colors are added in different proportions to form a mixed color called additive color mixing. The three primary colors are three colors that are independent of each other, and neither of them can be produced by mixing other two colors.
The addition of different proportions of the three primary colors to obtain a color is called additive color mixing. The law is:
Red + green = yellow
Red + blue = purple
Blue + green = blue
Red + blue + green = white
The best color matching of the display LEDs is: red 620-630nm, green 520-530nm, blue 465-475nm, of course, this range can also be reduced according to actual needs, such as red with 3nm for a file, blue green for 2.5nm For a file.Angle: In fact, the larger the angle, the better, but the more important is that the angle is not just big, but also the angle curve should be full and smooth, red, green and blue should be consistent, otherwise the display will be good. After that, some locations will display dark areas, or a certain color will be particularly bright or very dark;
3) Electrical parameters: The electrical parameters of the LED are mainly reflected in the forward voltage (vf) reverse current (Ir) and antistatic (ESD). Generally, the display screen is driven by a constant current of 5v DC power supply, so: LED Vf generally does not require too much consistency, as long as the control is within a reasonable range (typically red 1.8-2.2v, blue-green 3.0-3.4v); ESD is generally the bigger the better, because ESD is everywhere, so The larger the ESD of the LED, the less likely it is that the processing of the display screen will be problematic; the reverse current requirement is Vr=5v, IrQ10uAOutdoor display with elliptical in-line LED
LEDs for outdoor display screens generally use elliptical structure in-line lamps. Compared with LEDs for indoor display screens, outdoor elliptical lamps mainly have horizontal and vertical angles at the angle of illumination. Generally, the display screen is outdoors. The horizontal viewing range is relatively large, and the vertical viewing range is relatively small;
Generally speaking, the lateral angle of the LED of the outdoor display is about 110 degrees, and the longitudinal direction is about 50 degrees. Because the angle of the direct insertion lamp has many factors, the main performance is as follows:(1) The shape and appearance of the package of the LED;
(2) the cup structure of the bracket;
(3) the wafer and its structure;
(4) the refractive index of the encapsulating glue;
(5) consistency of material quality;
(6) packaging process (ie, the height position of the wafer);
Therefore, the angle of the LED for outdoor display is more difficult to master, not only requires good design, but also has a good process design and quality control level.
With the continuous improvement of technology, the requirements of display screens will be higher and higher. Of course, the requirements for LED packaging technology will be equally high. I hope that the industry colleagues will work tirelessly to make better products.
Electric Kettle are made by food grand stainless steel and Polypropylene. It helps you to have a 1.8L bottle of boiled water in 5 minutes. Type 201 Stainless stell is the main material for the electric kettle housing. sometimes called a tea kettle or teakettle, is a type of pot, typically metal, specialized for boiling water, with a lid, spout, and handle, or a small kitchen appliance of similar shape that functions in a self-contained manner. Kettles can be heated either by placing on a stove, or by their own internal electric heating element in the appliance versions.
Features:
360-degree swivel base: Great way with cordless pouring; kettle lifts off base for cord. Separate base to move kettle conveniently, 360°rotation design.The cord can be wrap neatly into the base bottom for easy storage. The concealed stainless steel heating element brings fresh hot water with no metal Taste.
Soft Handle for easy using: Comfortable stay-cool handle; brushed stainless steel finish. Cool-touch buttons and ergonomic stay-cool handle.
Large Capacity for Multiple Cups: 1.8 L large capacity, with Max. water level inside the kettle. almost 1.5x the size of most tea makers. Brew up to 6oz at once! Perfect for small gatherings & parties!
Fully Stainless Steel Faster Boils: Stainless Steel Interior cover with no plastic taste. Boils water rapidly, save more time and energy. Faster than the microwave & safer than your traditional stovetop teapot.
On/off switch with LED light.: Automatic On/Off switch makes life easier. No need standing by for hot water. It shuts down when reaches a full rolling boil. Boil-dry and overheat protection to ensure the safety use.
Time Saver & Higher Safety: 1500 watts energy efficient for quick heat-up time brings water to a boil, Fast boil, auto shut off and boil dry protection technology with three-prong plug.
Brushed stainless steel housing
Applications
Making hot water for tea brewing.
Making Coffee.
Cool milk-tea.
Steaming eggs.
Any occation if you need hot water in short time.
Any color of plastic is available to produce but in big quantity. Its
Electric Kettle
Electric Kettle,Stainless Steel Electric Kettle,Electric Boiler,Big Capacity Electric Kettle
Guangzhou Taipeng Electrical Appliances Technology CO., LTD. , http://www.kettles.pl