#### How to do calculation on dimension to make a big led screen?

Calculating the cabinet dimensions for an LED screen involves considering several factors, including the screen size, aspect ratio, pixel pitch, and any specific requirements or constraints. Here’s a general approach to help you calculate the cabinet dimensions:

1. Determine the screen size: Decide on the desired screen size, usually measured in inches or centimeters. This will depend on your specific needs and available space.

2. Choose the aspect ratio: Determine the aspect ratio for your LED screen, which is the ratio of width to height. Common aspect ratios include 16:9 (widescreen) or 4:3 (standard).

3. Determine the pixel pitch: Pixel pitch refers to the distance between adjacent pixels on the LED screen and is typically measured in millimeters (mm). It affects the resolution and image clarity. Choose an appropriate pixel pitch based on your viewing distance and desired visual quality.

4. Calculate the number of pixels: Multiply the screen width by the number of pixels per unit length based on the chosen pixel pitch. For example, if the pixel pitch is 2mm and the screen width is 1000mm, you would have 500 pixels horizontally (1000mm / 2mm = 500 pixels).

4. Calculate the number of rows: To maintain the aspect ratio, calculate the number of rows by multiplying the number of pixels horizontally by the aspect ratio. For example, if you have 500 pixels horizontally and a 16:9 aspect ratio, you would have approximately 281 rows (500 pixels * (9/16) = 281.25 rows).

5. Determine the cabinet dimensions: Divide the screen width and height by the number of pixels or rows to determine the cabinet dimensions. Keep in mind that each cabinet typically contains multiple LED modules or panels.

6. Consider additional factors: Consider any additional factors specific to your setup, such as the required space for mounting brackets, ventilation, cabling, and any structural or design considerations.
The specific calculations and requirements may vary based on LED module specifications, and your specific project needs. Refer to the specifications, guidelines, or consult with an LED screen professional for accurate and detailed cabinet dimension calculations.

#### How to fix taxi top led display at top of taxis or cabs?

To fix a taxi top LED display at the top of a taxi, you generally follow these steps:

1.Determine the mounting method: Different LED displays may have different mounting systems. Identify the specific mounting method provided for your taxi top LED display. Common methods include magnetic mounts, roof rack mounts, or custom brackets.

2. Prepare the taxi roof: Ensure that the taxi roof is clean and free from any dirt, debris, or previous adhesive residue. Clean the area thoroughly to provide a smooth and secure surface for mounting.

3.Position the LED display: Carefully position the LED display on the taxi roof, aligning it properly with the desired placement. Take into consideration any regulatory requirements or local laws that dictate the positioning of taxi top displays.

4.Secure the mounting system: Depending on the mounting method, follow the instructions to secure the mounting system in place. This may involve using screws, bolts, adhesive, or magnetic attachments. Make sure to tighten the mounting system securely to prevent any movement or detachment while the taxi is in motion.

5.Connect the power supply: Connect the power supply cables from the LED display to the appropriate power source inside the taxi, usually car batter DC12V output. Ensure that the power supply is compatible with the LED display and that the connections are secure.

6.Test the display: Once the LED display is mounted and connected to the power supply, test it to ensure it is functioning correctly. Verify that the content is displayed as intended, the LEDs are lighting up properly, and any control mechanisms (such as 4G wireless controllers or software) are working correctly.

6. Conduct quality checks: Perform a thorough quality check to ensure that the display is securely mounted, the content is clear and visible, and there are no loose connections or visual imperfections. Address any issues or adjustments required.

It’s important to note that the exact installation process may vary based on the specific taxi top LED display models and designs. Always refer to the provided installation manual or seek professional assistance if needed to ensure proper installation and adherence to safety guidelines.

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#### What’s COB LED Display?

COB LED display stands for “Chip on Board” LED display. In this technology, multiple LED chips are mounted directly onto a PCB (Printed Circuit Board) substrate, and then covered with a layer of phosphor to create a single lighting module. This results in a dense concentration of LEDs, which enables the COB display to produce high-quality illumination with a very high lumen output.

COB LED displays have several advantages over other LED display technologies. First, because the LEDs are closely packed together, they produce a uniform light output with no visible gaps or seams between the individual chips. This results in a smoother, more continuous image without the “mosaic effect” that can be seen in some other types of LED displays.

Additionally, COB LED displays are highly energy-efficient, due to their high luminous efficacy (lumens per watt). They also have a longer lifespan than traditional LED displays, and require less maintenance, as they do not have any moving parts or components that need frequent replacement.

COB LED displays are commonly used in a variety of applications, such as indoor and outdoor advertising, large-scale video walls, and stage lighting for concerts and other events.

#### What’s GOB LED Display?

A GOB LED display refers to an LED screen that utilizes a technology called “glass on board” (GOB) during the manufacturing process. GOB LED displays are made by placing the LED chips directly onto a PCB (printed circuit board) and then covering them with a layer of glass. The glass protects the LED chips from damage and also enhances the display’s durability and reliability.

Compared to traditional LED displays, GOB LED displays have several advantages. First, the glass layer provides an additional level of protection against impact and moisture, making them more resistant to damage and weathering. Second, the GOB technology allows for a higher pixel density, resulting in a clearer and sharper image. Finally, the glass layer can also improve the viewing angle and color accuracy of the display.

GOB LED displays are commonly used in a wide range of applications, such as outdoor advertising, digital signage, sports arenas, and concerts.

#### What is flexible soft led display?

A flexible soft LED display is a type of LED screen that is made up of flexible materials that can be bent, curved or even rolled up. The display is made up of a matrix of LEDs that are mounted onto a thin and flexible substrate, such as a plastic or rubber material. The flexible nature of the display allows it to be easily shaped to fit around various objects or surfaces, making it ideal for a wide range of applications such as curved walls, cylindrical columns, and even wearable devices.

Flexible soft LED displays are also lightweight and thin, making them easy to transport and install. They are commonly used in various indoor and outdoor settings such as shopping malls, trade shows, concerts, sports events, and advertising displays. The displays offer high-resolution graphics and bright, vivid colors that are visible from a distance, making them an effective way to grab people’s attention and convey messages or advertisements.

#### Who use taxi top led display at USA

Taxi top LED displays in the USA are primarily used by taxi companies and ridesharing services such as Uber and Lyft. These displays are typically installed on the roof of the taxi or rideshare vehicle and can be used to display advertisements, promotions, and other information to passengers and passersby.

In addition to taxi companies and ridesharing services, some businesses and organizations may also use taxi top LED displays for advertising purposes, such as promoting events, products, or services. For example, a concert promoter may use taxi top displays to advertise an upcoming show, or a local business may use them to promote a sale or special offer.

It’s worth noting that the use of taxi top LED displays may be subject to regulations and restrictions in certain cities or states, so it’s important to check local laws and guidelines before using these displays for advertising purposes.

#### What’s the newest technology in led display?

As of my knowledge cutoff in 2023, the newest technology in LED display is mini-LED.

Mini-LED technology uses smaller LED chips (typically less than 100 microns in size) and a greater number of them to create a more densely packed array of LEDs. This allows for higher resolution displays with better contrast, brightness, and color accuracy than traditional LED displays.

Mini-LED displays also use local dimming zones, where groups of LEDs can be dimmed or brightened independently of one another, leading to better black levels and improved HDR performance. Mini-LED technology is being used in high-end televisions and monitors, as well as in commercial displays and digital signage.

However, it’s important to note that technology is constantly evolving, and there may be newer advancements in LED display technology since my knowledge cutoff in 2023.

#### How to do assembly diecast LED cabinets?

Assembling diecast LED cabinets typically involves several steps. While the specific process may vary depending on the manufacturer and the design of the cabinets, here’s a general overview of how assembly is commonly carried out:

1. Gather the components: Collect all the necessary components for the LED cabinet assembly. This includes the diecast frame or cabinet panels, LED modules or panels, power supply units, wiring, connectors, mounting brackets, screws, and any other hardware specified in the assembly instructions.

2. Prepare the frame: If your LED cabinet has a diecast frame, start by inspecting and cleaning the frame to ensure it is free from any dirt or debris. Check for any defects or damage that may need to be addressed before proceeding.

3. Mount the LED modules: Install the LED modules or panels onto the frame according to the manufacturer’s instructions. This usually involves using screws or mounting brackets to secure the modules in place. Make sure the modules are aligned correctly and securely attached to the frame.

4. Connect the wiring: Connect the wiring from the LED modules to the power supply units. Follow the provided wiring diagram or instructions to ensure proper connectivity. Take care to connect the positive and negative terminals correctly to avoid any electrical issues.

5. Secure the power supply units: Mount the power supply units onto the frame or designated areas within the cabinet. Use screws or other provided mounting mechanisms to secure them in place. Ensure that the power supply units are positioned safely and securely to prevent any movement or damage during operation.

6. Test the assembly: Before closing the cabinet, test the LED modules and power supply units to ensure they are functioning correctly. Verify that the LEDs are lighting up as intended and that the power supply is delivering the required voltage and current.

7. Close the cabinet: Once you have verified the functionality of the LED modules and power supply, close the cabinet. Secure all panels, doors, or access points according to the manufacturer’s instructions. Double-check that all screws or fasteners are tightened properly but avoid overtightening, which could cause damage.

8. Quality control and inspection: Conduct a final quality control check to ensure that the assembled LED cabinet meets the required standards. Inspect the cabinet for any defects, loose connections, or visual imperfections. Make any necessary adjustments or repairs to ensure the cabinet is in optimal condition.

It’s important to note that the assembly process may vary depending on the specific design and features of the diecast LED cabinets you are working with. Always refer to the manufacturer’s instructions and follow their recommended assembly guidelines for the best results.

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And we also provide custom design of led screen for our clients.

#### What is Transparent Taxi Rear Window LED Display?

A transparent taxi rear window LED display refers to a digital display technology that is designed to be installed on the rear window of a taxi or other similar vehicles. It utilizes transparent LED panels or modules that allow light to pass through, maintaining visibility from inside the vehicle while displaying content to viewers outside.

The transparent nature of the display enables passengers inside the taxi to see through the window clearly, maintaining visibility for safety and comfort. At the same time, the rear-facing side of the display showcases dynamic advertisements, promotional content, or other information to people outside the vehicle, such as pedestrians or drivers following the taxi.

These LED displays are typically lightweight, thin, and adhere to the rear window glass using adhesive or other mounting mechanisms. They are designed to withstand various environmental conditions, such as vibrations, temperature changes, and exposure to sunlight or rain.

Transparent taxi rear window LED displays provide an innovative advertising solution for taxi operators and advertisers. They effectively utilize the previously underutilized space of the rear window, allowing targeted messaging and promotional content to reach a wider audience while still maintaining the visibility and functionality of the vehicle.

# What is LED display?

LED is the short name light emitting diodes.  of One LED display is a flat panel display, which uses an array of light-emitting diodes as pixels to generate colorful video display. Its brightness allows it to be used outdoor where it’s visible in the sun to replace traditional outdoor billboards.  And in recent years,  it’s have also become commonly used in destination signs on public transport vehicles, as well as variable-message signs on highways.  LED displays are capable of providing general digital illumination display, as when used for stage lighting or other decorative purposes (as opposed to informational).

Aside of led display, led is widely adopted at led lightings for home&office, laser technology,  industry application and etc.   And in the new age, led grow lights are becoming more and more popular in the plant growing at home and garden area.

#### Taxi Top LED Display

Taxi top led display are digital and virtual central control through cloud server base with help of  4G technology.   Replacing advertising image or video is just a few clicks in front of computer without physical changing the pvc painting manually at the top of taxis.  So once installed at the roof of taxi,  no extra charge for advertising resources, cutting needless overhead expenditure. The focus will be signing advertising contracts with potential clients, and make playlists campaigns at the cloud server for any length of preset time.  It increases consumer’s awareness, allows for immediate feedback with QR code, boosts downloading APP of advertising company.

1. End cycling ads exchanging cost.    Because ads are displayed digitally, there is no print, delivery, fixing costs!  It helps getting business in big scale at local areas in a vastly reduced cost and brings much incomes!
2. Geo Tagging.          With Geo module inside of each terminals, taxi routine is able to track and record in database. Ads campaign is to be geo targeted to change within a certain radius of a geographic location in editable form.  The services of Uber or Didi or some other car-hailing service companies are all based on Geo tagging functionality.
3.  Group Control.   With central console setup  at the cloud server,  thousands of terminals are able to control and update through 4G network virtually.  Edited playlist is published to reach terminal displays in a few seconds.
4.  Statistics.    When advertising demands are fulfilled and implemented at the taxis fleet,  the playing reports for each ads will be generated in daily/weekly/monthly base.  All ads playing logs are available in file format (excel or pdf ) to show for clients.
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