LED display sales training
Product sales project pre-sale service:
Client installation displays
a. Be familiar with the scene position size. According to the installation dimensions calculation conforms to the standard display products of the company's size:
Case 1:
Customer installation dimensions for (or area) of 110 square meters, asked 3906 pixels per square meter:
Recommended recommend customer choose display ratio of 4:3 display, according to the installation dimensions conform to the standard display products of the company size calculation methods:
A long side to X, then the shorter side is 3/4 X
According to the area calculation formula: length * width = 110 square meters,
3 X/X * 4 = 100
X = 12.11 M
The long size is: 12.11 meters, the section size is: 9.0825 m
According to the standard module company PITCH 16, calculate the size of the actual display:
= W (width) of size 12.11 * 62.5 = 756.875 pixels
= 757 * 16 = 12.112 m
= H (high level) of size 9.0825 * 62.5 = 567.5 pixels
= 568 * 16 = 9.088 m
Actual display size is: 12.112 * 9.088 = 9.088 m, the display of the actual size to tell customers, communicate with the customer the customer should be acceptable.
Case 2:
Customer installation dimensions for (or area) of 110 square meters, asked 2500 pixels per square meter:
Recommended recommend customer choose display ratio of 16:9 screen, according to the installation dimensions conform to the standard display products of the company size calculation methods:
A long side to X, then the shorter side is 9 X / 16
According to the area calculation formula: length * width = 110 square meters,
* 9 X/X 16 = 100
X = 13.984 m
The long size is: 13.984 meters, the section size is: 7.866 m
According to the standard module company PITCH 20, calculate the size of the actual display:
W (width) of 50 = = 13.984 * 699.2 pixels
= 700 * 20 = 14.00 m
The size of the H (high level) = 7.866 * 50 = 393.3 pixel
= 394 * 20 = 7.88 m
Actual display size is 14.00 * 7.88 = 14.00 m, tell the display of actual size to customer, and customer communication should be acceptable
2. Installation site to the customer pre-sales guidance scheme, convenient sale installation screen, good for the life of the product, after bad production, improve the quality of products, meet and exceed customer requirements:
1. The screen and screen and building the junction must be strictly waterproof leakage protection; Screen should have good drainage measures, in the event of water discharge smoothly;
2. The lightning arrester on the screen and building installation. Screen main body and the shell to keep good grounding, grounding resistance is less than 3 ohm, lightning causes a large current discharge in a timely manner;
3. The installation of ventilation cooling equipment, makes the screen body internal temperature between - 10 ℃ to 40 ℃. Behind the screen above the shaft LiuFeng installation Machine, discharge of heat;
4. Choose working temperature between - 40 ℃ ~ 80 ℃ of industrial-grade integrated circuit chips, to prevent the winter temperature is too low to make screens won't start. ;
5. In order to ensure that in the case of ambient light strong visible over a long distance, must choose ultra high brightness light emitting diode;
6. Display medium new wide-field tube, a broad perspective, color pure, coordination, service life of more than 100000 hours
7. Screen installation site must conform to the requirements of machinery installation, maintenance operation space.
8. Efficient stadia and the size of the actual installation site.
3. LED display technology parameters:
1. LED display according to the display color is classified into:
Single color LED display screen, dual color LED display and full color LED display (3 colors).
According to the gray level and can be divided into 16, 32, 64, 128, 64 level gray scale LED display, etc.
Monochrome screen usually made up of red light emitting materials.
Generally speaking, red and yellow green double colors screen of light-emitting materials.
Tricolor screen is divided into full color (full color), consists of red, green and yellow wavelength (570 nm), blue;
True color (nature color), by red, pure green wavelength (525 nm), blue.
1. Basic markers:
LED tube:
Short for Light emitting Diode (Light Emetting Diode). In some of the semiconductor PN junction, the minority carrier injection with majority carrier compound will release excess energy in the form of light, so as to directly convert the electric energy to light energy. P-n junction to add reverse voltage, minority carrier injection hard, so the light. Principle of the use of injection electro luminescent diode called light-emitting diodes (leds), known as LED. Due to the LED low work voltage (1.5 V to 3 V), active luminous and has a certain brightness, brightness in voltage (or current) regulation, and in itself, and impact resistance, resistance to vibration, long life (100000 hours), so in the large display devices, there is no other way of display with LED display
LED module: made up of several chip light-emitting matrix, using epoxy resin encapsulation in the plastic case, commonly used for 8 by 8 dot matrix module.
LED tube cluster: to increase the brightness, increase visibility, to integrate the two to dozens of the above only LED encapsulation into a cluster, as a pixel. The cluster LED tube is mainly used to make span large outdoor screen, also known as pixels. At present domestic application is less.
Mixer SMD type LED lamp (or SMD LED) :
Is LED lamp post welding forms of packaging, can be used in indoor full color display screen, which can realize the single point of maintenance, effectively overcome the Mosaic phenomenon.
2. LED display:
Pieces of LED screen, LED module or cluster size of assembled according to actual needs are arranged in matrix, with special display circuit, dc regulated power supply, software, framework and outside decoration, etc., which constitute a LED display.
Screen resolution:
LED display horizontal pixel points multiplied by the vertical pixel points, is the screen resolution.
Unit board: is the main body of the display unit, composed of luminescent material, and drive circuit. Indoor screen is usually made up of unit board.
Module: the minimum display unit outdoor displays. By several leds according to certain order, by encapsulation techniques such as welding, glue in fixed form, has become a module.
Unit housing: is the main body of the display unit, composed of unit board in a certain order. Outdoor screen is usually made up of unit housing.
3. The pixel
Pixel: each of LED display can be individually controlled lighting units called pixels.
Pixel diameter: diameter of 30 pixels is refers to the diameter of each LED pixel, the unit is mm.
Pixel spacing: LED display both the center distance between two pixels is called pixel spacing, also called point spacing. Point distance closer, in the higher pixel density per unit area, high resolution, cost is also high. Pixel diameter is smaller, the smaller the dot spacing.
4. The base color
Single color:
Each pixel has a LED tube core, tube core for red light, can give green light tube core, can also be for blue chip. Because the blue light tube core is relatively expensive, therefore use single color blue tube core is less.
Double colors: each pixel has two LED tube core: one for the red light tube core, one for the green light pipe core. Bright red light tube core when the pixels to red, bright green light tube core when the pixel as green, red, green, and the two tube cores and the pixel at the yellow light. The red, green to gezer.
Full color: red, green, double colors plus blue primary colors, three colors will constitute the full color. Due to the blue tube core prices decline gradually, and full color strong expressive force, full-color screen is in the rising market demand.
5. Gray
Gray: refers to the pixel light-emitting change and color shades of light and shade degree.
6. The brightness
Brightness (Luminance) : in a given direction; The luminous intensity per unit area. Metric unit is CD/m2 brightness.
7. Control technology
Refresh rate: speed of screen refresh, refresh rate, the lower the more powerful image flicker, jitter, the person's eye fatigue. General display 250 HZ.
Duty cycle: in within the display area must be lit at the same time the number of rows and the number of lines across the region. Indoor screen is commonly dynamic scanning 1/16 or 1/16, 1/4 scan, outdoor screen is generally static.
Resolution: the horizontal direction and vertical direction on the screen of the display points, the more resolution, image more clear, can increase the information capacity of the screen.
8. The visual distance:
Minimum visibility:
With certain shape, intensity, distance from two points of light, unable to determine the position of two points to the two, the minimum vertical distance, referred to as the minimum range, and that point and two points of light is called the minimum Angle of view. Therefore minimal impact range and the minimum Angle factors are: the shape of the light spot, brightness, distance.
Biggest stadia: to have a certain rectangular display screen brightness, distance, unable to determine the rectangle shows the location of the image content point to this rectangle frame, the minimum vertical distance, referred to as the biggest stadia. So the factors influencing maximum visibility are: rectangular display brightness, distance.
Efficient stadia: is greater than the minimum range, less than the range of maximum visibility, referred to as the effective range
9. Scanning board main function
In pieces, and in data transfer flow, belong to own that part of the river closure down.
In pieces, and transform data into grayscale signal, output to the scan showing on the display board.
Mixer, nonlinear correction function.
10. Data transmission sending card and receiving card divides into two parts:
Send a card to the host controller after processing the data transmission to the receiving card in balance way. Receiving card, receive send CARDS from the data in balance way, translates into standard TTL level signal output.
11. The host controller:
The function of the host controller is the data acquisition card for temporary and format conversion, and partition the data sent to the display screen. The host controller on a total of two data sent, each mouth can control 512 rows of data, according to the actual display line Numbers to determine how much to send CARDS.
12. Control points: out of control points is not more than three over ten thousand of the indoor LED display, outdoor LED display is out of control points should be not greater than three over one thousand, and the discrete strong;
13. Consistency: consistency of LED screen is better, to have a balanced whole the brightness of the screen, no obvious color piece.
14. Security has no potential safety hazard, leakage current, the leakage current shall not exceed 3.5 mA (ac RMS); Point of strength, the LED display can be 50 hz, 1500 v (ac RMS) experiment voltage Lmin should not occur insulation breakdown; At the same time LED display in fuse and switch power supply should have warning signs.
15. Appearance: LED display frame has no obvious scratches. Outdoor LED display pixel pipe installation should be consistent, not loose and broken shell.
16. Structure: LED display part can use the material such as steel, aluminum, iron, demand structure, strong, and beautiful.
17. The density of the density (points); The number of pixels on unit area (unit: point/m2). Points with point spacing calculation relationship there, LED display of the density is higher, the image is clear, the best viewing distance scope is smaller.
18. The flatness: (level up degree) light-emitting diodes, pixel, display module, display module, the LED display plane of concave and convex misalignment. LED display of the roughness is bad can lead to watch, screen color is not uniform.
Under the same dot density, the brightness of the LED display depends on the material of the LED chip, adopted by the packaging form and size, chip, the greater the brightness is higher; On the contrary, the lower the brightness.
19. Perspective: viewing Angle) in the horizontal and vertical directions the brightness of the LED display, respectively the normal direction of the brightness of the half, the observation direction and LED display normal respectively referred to as a horizontal Angle and vertical Angle of view, general with level 120 degrees and the vertical 60 degrees.
19. The power consumption and power requirement:
Display power consumption divided by the average power consumption and power consumption.
The average power consumption is also called the working power, actual power consumption is normal.
Maximum power consumption is a startup or on extreme situations of power consumption, the maximum power consumption is an alternating current power supply (wire, switch, etc.) must be considered. The average power consumption is usually one third of the maximum power consumption. Display is a large precision electronic equipment, for the sake of the safe use and reliable working, its AC220V power input end or AC220V power input end is connected to the computer must be grounded. Note: the AC220V power input end of the grounding end of the computer.
What are 20. Environmental brightness for screen brightness requirement?
General brightness requirements are as follows:
(1) indoor: > 800 CD / ㎡
(2) half indoor: > 2000 CD / ㎡
(3) outside (it faces north) : > 4000 CD / ㎡
(4) outdoor (sits) : > 8000 CD / ㎡
21. Red, green and blue in the brightness of the white makeup of what requirements?
Red, blue, and green contribution in respect of the white colour is not the same. Its root cause is due to human the retina of the eye to different wavelengths of light feeling. After a great deal of experimental test about proportion, get the following
Than red, green and blue brightness is simple: 3:6:1, accurate than red, green and blue brightness is: 3.0:5.9:1.1.
22. Why do high-grade full-color displays use pure green tube?
In actual LED display production, should choose high luminous efficiency and can gain rich color bright tricolor LED light tube, in order to make as much as possible in the chromaticity diagram of colour triangle area near the tongue color spectrum curve, to satisfy the rich color and send enough brightness, in tongue top for 515 nm wavelength light curves, so the high-end LED display use 515 nm wavelength close to pure green LED tube, for example, use 520 nm, 525 nm, 530 nm wavelength leds.
23. Why choose DVI display interface standards?
(1) the DVI display card interface are meet the international standards of computer display interface
(2) without having to open the case, can convenient installation;
(3) high memory, dynamic images showed strong ability;
(4) hardware and software compatibility ability;
(5) support all operating systems and application software, according to flexible and convenient;
(6) mass production, low cost, convenient maintenance.
24. Full color indoor module and what is the difference between SMD full color?
(1) light emitting parts: full color display module is usually yellow, green, pure green of the module price is more expensive;
SMD full color usually use pure green tube core;
(2) the display effect: module visual feel coarser, full color pixel brightness is low, easy to have Mosaic phenomenon;
SMD full color consistency is good, high brightness;
(3) maintenance: full-color module is not easy to maintain, the whole piece of module replacement cost is higher; SMD full-color easy maintenance, single lamp maintenance can be performed more 13. How to help the user to select the suitable display?
(1) the content of needs;
(2) confirm with visual distance and Angle of view;
(3) screen resolution requirements;
(4) install environmental requirements;
(5) cost control;
25. The display aspect ratio is commonly?
Graphic screen: according to content to display;
Video screens: general for 4:3 or close to 4:3; The ideal ratio for 16:9.
26. A set of control system can control points?
Communications screen A card: monochrome, two-color, 1024 x 64
Communications screen card B: monochrome: 896 x 512 double color: 896 x 256
DVI double color screen: 1600 x 1024
DVI full color: 1024 x 512
27. The screen installation requirements?
Power supply: power supply connection point should be within the screen size; 220 v mains power supply, wire, zero line and grounding line;
380 v mains power supply, three line, zero line and grounding line; Wire the same as the zero line conductor cross-sectional area; Above 10 kw screens should add step-down boot device.
Communication: communication distance is based on communication line length is defined. To install screen models used by communications line length standard to install the communication line. Communication line with the power cord in the same line pipe line.
