Full-color LED display advantages and identification methods

Time:2018-10-19 Views:242

I. main features of full-color LED display

Full-color LED display is a kind of LED display, which has the following characteristics:

(1) rich colors: the display unit board is composed of three primary colors (red, green and blue), and the red, green and blue all have 256 levels of gray to constitute 16,777,216 colors, enabling the electronic screen to realize dynamic images with rich colors, high saturation, high resolution and high display frequency.

(2) good effect: using nonlinear correction technology, the image is clearer and more layered;

(3) strong reliability: distributed scanning technology and modular design technology are adopted, with higher reliability and stability;

(4) ultra-strong detection function: real-time detection of pixel failure in the screen and remote transmission of working state of pixel;

(5) the new mask design makes the light emitted by LED almost reflect 0, ensuring the display effect of the screen;

(6) high flatness: the flatness coefficient of the box is <0.5mm, and the power factor is over 88%.

(7) diversified input signals: support stage signals such as RF, s-vidieo, RGBTV, YUT, YC, COMPOSITION, etc.;

(8) high waterproof performance: water-proof rubber ring is used on the back of the module, and high-quality imported rubber is used on the front side for filling;

(9) durability: high-temperature spraying technology is adopted to greatly improve the anti-rust function;The light-emitting module is guaranteed for 10 years. The mask does not reflect light.

Ii. Selection of supporting product materials for full-color LED display screen

1.LED lights and chips.

The LED lamp is both an LED light-emitting tube and a key component of the LED electronic display, so it should adopt reliable quality and encapsulate mature LED products.The selected LED products must have good stability, low dispersion, HBM greater than 4,000v, small attenuation range, strong pressure resistance, brightness, wavelength, Angle consistency, good light distribution effect, as well as resistance to temperature difference, humidity and ultraviolet.

2. The box body.

The whole is made of steel or aluminum, and the door structure is adopted.The top of the box adopts pin and bottom adopts guide sleeve to ensure accurate positioning between the box body.The overall protection of the box conforms to the IP65 standard. In addition, the structure should take heat dissipation into full consideration.

3. Switch power supply.

The display power supply adopts the certified switch voltage stabilized power supply module. All the switch power supply has been tested, screened and aged strictly.Ensure full compliance with international safety and quality certification requirements to meet the long-term stable and reliable working requirements of the display screen.Under rated working conditions.Ensure service life is longer than 10 years.

4. Connectors.

The connector is an important connector in the system.High quality connectors shall be used to ensure the thickness of the pure gold plating layer of connectors and maintain the best electrical connection performance.Guarantee the good electrical connection performance of the system under high temperature and high humidity, which can make the system run steadily and reliably for a long time.

Circuit boards.

The circuit board adopts flame retardant epoxy board, the design layout is reasonable, and the routing specification meets the requirements of electromagnetic compatibility and circuit stability.Manufacturers should choose products from well-known manufacturers.

6. Drive chip IC devices.

The drive circuit adopts international famous brand constant current drive chip.Maintaining high precision constant current output and high reliability in large temperature range can greatly improve the uniformity and reliability of the display screen.The main materials of the display system shall be certified by CE, FCC, UL, CCC, ISO9000, etc.It is believed that if we do what mentioned above and stick to reliable supporting equipment materials and professional r&d and design technology, the failure rate of the display screen will be reduced, and the reliability and stability of the LED display screen will be greatly improved

Iii. Identification of full-color LED display

Full-color LED display can be judged from the following aspects:

Flatness.

The surface flatness of LED display shall be within + / -1mm to ensure that the display image will not be distorted. Local bumps or depressions will result in dead Angle in the visual Angle of the display.Flatness is mainly determined by the production process.

2. Brightness and visual Angle.

The brightness of indoor full-color screen should be above 800cd/m2, and the brightness of outdoor full-color screen should be above 1500cd/m2 to ensure the normal operation of the display screen, otherwise the image displayed could not be clearly seen due to the low brightness.The brightness is mainly determined by the quality of LED beads.

The size of the viewing Angle directly determines the size of the LED display audience, so bigger is better.The size of the visual Angle is mainly determined by the way the core is encapsulated.

3. White balance effect.

White balance effect is one of the most important indicators of LED display.When the proportion of the red, green and blue primary colors is 1:4.6:0.16, it will show the pure white. If the actual proportion has a little deviation, it will show the deviation of the white balance.The quality of the white balance is mainly determined by the control system of the LED display, and the lamp bead also has an influence on the color reduction.

4. Color reduction.

The reduction of color refers to the reduction of color in the LED display. The color displayed by the LED display should be highly consistent with the color of the source, so as to guarantee the authenticity of the image.

5. Product design.

Full color LED display, indoor outdoor energy-saving highlighting high refresh portable products, such as in all walks of life have different requirements for LED display, so buyers in distinguish abundance when choosing LED display and LED display, to gather their demand to the maximum extent LED display products are conform to their own needs.

6. Material control.

The selection of materials plays a decisive role in determining quality and selecting high-quality raw materials to control the quality of LED display screen at the source.So for the buyer to be the focus of the investigation.

1) high-grade on behalf of the subfamily, sharp leds light lei (chip packaging) intermediate wafer silan (chip), LED lights LED high industrial chain involved, especially involving more domestic packaging industry, the same wafer silan chip LED quality varies due to the different of the packaging, not pure, high product of LED lamp encapsulation tube representative for light star lehman (Taiwan) countries.

2)LED drive IC: as the leading manufacturer of LED drive, agglomeration technology has been the world‘s first leader in the field of LED display drive for many years. It has achieved over 60% of LED display drive in China and over 50% of the global market share of agglomeration 5024 is the choice of most high-end LED display products.

3) power base (reinforced type) : the power base is the main device to connect the power line with PCB. Although it is not the main aspect that determines the quality of LED display, its strong durability and conductive performance also affect the life and protection level of the display body.

4) needle discharge (with simple ox horn) : the needle discharge is the main component of the control system and PCB board control circuit through the wire discharge connection. The optimal selection of needle discharge with cow horn can not only prevent the rework caused by the reverse wire insertion when installing the screen, but also effectively prevent the needle discharge from exposing the mounting screen and maintenance personnel.

5) resistance, capacitance and other components: as the saying goes, everything is fine. As the LED display screen is often switched on and off, the quality of capacitance also affects the protection of the display screen body when switching. Resistance is the main component that controls the current of the display screen.

6)LED module face mask and shell: the main material is plastic.Imported quality materials, deformation resistance, strong environmental resistance.