LED Display Screen Buying Guide

Before you carry out a big purchase for LED display screen, you'd better check the following information first.

1. Brightness.

Generally, brightness varies in accordance with different applications.
A. Brightness for indoor use> 800CD/M2
B. Brightness for semi-indoor:> 2000CD/M2
C. Brightness for outdoor use(display screen faces north):> 4000CD/M2
D. Brightness for outdoor use(display screen faces south):> 8000CD/M2

The brightness of red, green and blue light contribute differently in composition of white light. Here a are some data and specifications for you reference. Generally brightness ratio for these 3 colors is 3:6:1. Precise ratio is 3.0:5.9:1.1.

With a certain brightness and pixel density, the calculation for a single-tube's brightness would be as follows.
Take two red light, one green, and one blue light for example.
Red LED light's would be: Brightness (CD) / M2 ÷ Pixels / M2 × 0.3 ÷ 2
Green LED light's brightness: brightness(CD)/ M2 ÷ Pixels / M2 × 0.6
Blue LED light's brightness: brightness(CD)/ M2 ÷ Pixels / M2 × 0.1

Suppose the density is 2500/sqm, 2 Red, 1 Green 1 Blue, and the brightness requirement is 5000CD/M2 per square meter, then:
Red LED brightness: 5000÷2500×0.3÷2=0.3
Green LED brightness: 5000÷2500×0.6=1.2
Blue LED brightness: 5000÷2500×0.1=0.2
Brightness of each pixel would be: 0.3×2+1.2+0.2=2.0 CD

2. Size.

Do check the following points first before you make a decision.
A. Relationship between effective visibility range and the size of LED display;
B. Pixel and resolution;
C. Area estimation;
D. Installation and operating space for maintenance ;
E. Obliquity's impact on distance.

3. Display Effect

A. Text Display: The display effect depends on character's size depending and resolution requirements;
B. Video Display: 320×240 matrix;
C. digital standard DVD display: ≥640×480 matrix;
D. Complete PC Video: ≥800×600 matrix.

4. Size Design factors

A. Display contents;
B. Space and area factor for a certain application;
C. Display unit size (for indoor screen) or pixel( for outdoor screen).
Here is a general ratio for led display scree.
Screen for graphic: determined by the contents;
Screen for video: generally 4:3 or close to 4:3;
Ideal screen ratio: 16:9.

5. Power Consumption & Power Supply

The power consumption of display screen is divided into average power consumption and maximum power consumption. Average power consumption, also known as working power, refers to an actual power consumption in use. Maximum power consumption means the consumption when the screen is started or in a full operation. It's must be considered if you use AC power supply. Usually, average power consumption is about 1/3 of maximum power consumption.

6. LED Key Indicators

A. Maximum output current. Currently, the maximum output current of a constant-current LED drive chip is about 90mA.

B. Constant-current output channels.
There are 2 types of constant current output channels, 8-channel and 16-channel. The latter one is the most common in use. It reduces the chip size, and makes it easier for LED drive board (PCB) layout.

C. Accurate current output.
Accurate current output is a very critical factor which has a great impact on LED display. The greater the error, the bad the screen's display effect. Bittobit current error of a constant current chip is typically within ±3%, and chiptochip current error is within ±6%.

D. Data shift cycle.
It determines the data's transfer speed of led display screen. It is also a key indicator for the display's update rate. As a large-size display device, the update rate should be 85Hz or more, therefore ensuring display stability(no flashes). The data shift cycle of a constant current drive chip ranges from 15MHz to 25MHz or more.

Recommended Posts:
"What's LED Display?"
"LED Display's Classification"
"Features and Installation of LED Display"
"LED Display Screen Buying Guide"
"Do's N' Don'ts with LED Display"
"How to Select High Quality LED Displays?"
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