About the current gain

Usually, the LED driving current value is achieved by setting the resistor of the Rext terminal of the driving IC, so that the display can meet the required brightness within a safe range, such as 6000cd/m2. But after years of using, the efficiency of the LED will degrade, which will cause the brightness decrease at the initial current value. If we want the brightness to be 6000cd/m2, the current gain is needed.

By adjusting the current gain value of the RGB on the Uni-Master software, the instructions are sent to the driving IC through the serial port. The brightness of the LED is adjusted by changing the drive IC output current value, thereby changing the Rext terminal voltage value of driving IC, which can increase the current value of 200%.

Take the Artemis XT 16mm with NICHIA 346KS as an example, the brightness gain can make the LED screen still meet the normal demand after 10 years of use.

The data came from the 10-year monitoring on a LED screen with an over 500 square meters in Xi'an.

If we use Artemis XT 16mm with 346KS on a American Standard billboard Bulletin size (14 'x48'), the brightness and power consumption are shown in the following diagram:

We set the initial current value to set the brightness to 7500 cd/m2. When the brightness of LED attenuates, the driving current of LED can be increased by the current gain function of UNI-MASTER, so that the attenuated LED reaches the expected brightness value. In the first five years, the brightness remains 7500 cd/m2 unchanged, and 5500 cd/m2 brightness after ten years are still available.

In this way the initial current can be set to 75% of the maximum current at the very beginning, and the brightness is increased by the current gain in the later period. In this condition, the LED is not always driven by the maximum current. The drive current reduces, the heat reduces as well, so the decay rate of LED will be reduced (shown below by the Nichia test). This means that LED can work for a longer time with a certain brightness, and its power consumption will be relatively lower.

The method of calculating the brightness of the LED display

The brightness of the LED display is assembled by the brightness of each LED.

Let’s have an example:

For a P16 display with 1R1G1B lamp LED and 1/2 scan mode, there are 3906 dots in 1m2. Let’s say the brightness of red LED is 800mcd; green is 2300mcd; blue is 350mcd. Then the brightness for 1m2 in theory is (800+2300+350) *3906/1000/2=6737.85cd/m2.

How to calculate the pixel brightness if we know the brightness and the density of pixels of the display?

The brightness of the red LED: brightness cd per m2 / pixels per m2 * 0.3

                               green LED: brightness cd per m2 / pixels per m2 * 0.6

                                 blue LED: brightness cd per m2 / pixels per m2 * 0.1

Example:

A display with 10000 pixels/m2, SMD, brightness 6000cd/m2,

Then the brightness of each LED:

Red: 6000/10000*0.3=0.18 cd

Green: 6000/10000*0.6=0.36 cd

Yellow: 6000/10000*0.1=0.06 cd

The brightness of each SMD LED=0.18+0.36+0.06=0.66cd.

LED Poster VS LCD Poster (2)

In terms of service life, the light flux attenuation of LCD display is fast, it needs to be replaced after running for about a year and a half generally, but the LED poster can run for more than five years in the same environment. Moreover, because of the splicing features of LED display, LED poster is easy to maintain and reduce the loss rate of equipment failure, which can greatly reduce the economic loss of the advertising operators.

               LCD Poster                                      LED Poster 

With the development of Internet, the new marketing methods such as two-dimensional code, LBS, even the latest NFC payment and so on, which are more and more popular among advertisers, LED displays are the best advertising carriers. You can also use interactive technology to enhance the interaction between LED poster and audience, such as touch screen and  cloud technology broadcast control management.

Based on the above advantages, the advertising market has a great potential demands for the LED poster, and it has shown great acceptance ability at this stage. Despite the market demands, in current, in the environment that the outdoor big screen market is becoming more and more saturated, LED posters break the boundary of display devices between big size display and small size display for the enterprise, and open a new outlet for the development of the industry.

LED Poster VS LCD Poster (1)

In the field of advertising display equipment, LCD display and LED display have not interfere with each other, and develop independently. Poster is a typical representative in the display field. LCD poster is close to the crowd, the media radiation range is less than one hundred square meters. LED poster spread a wide range, covering thousands of square meters of audience.

Compared with the LCD poster, LED poster break the restrictions that is only suitable for remote viewing. In size, LED poster is generally larger than the size of the LCD poster, usually 72 inches or more.

LCD Poster                                            LED Poster

However, LCD poster is generally 46 inches, 55 inches, 70 inches, the biggest can be 82 inches.The cost of LCD poster increases exponentially with the increase of size. More than 100 inches is more expensive. For advertising operators, the cost effectiveness is much smaller than the same size LED poster.

Besides this, LED poster is not easy to be obscured because of the large screen area, so it can carry more advertising information and bring a stunning visual effect. Moreover, the play content of the larger display area is more likely to reach the audience and maximize the profit of the advertisers.

From the perspective of comprehensive income, the cost of the LED poster is far less than LCD, but can receive more than twice  benefits of traditional LCD poster.

Therefore, LED posters are becoming more and more popular with users。

Indoor fine pixel pitch 1.6mm,1000Nits,3840Hz,270W/sq.m. Processing 19Bits. Seamless, no flickering and no lining images.

Built for commanding center, TV broadcasting room, conference hall. More about 1.6mm, please contact: marketing@qs-tech.com

Among landmarks of The Bund (in Chinese: Waitan), the Aurola Tower is well remembered for LED lighting show I ❤SH. The gigantic LED display was installed on the east side of the Bund and next to the Oriental Pearl Radio & TV Tower. The display is visible from entire Bund, with a total display area of 3591 square meters, which was once registered as the largest screen in Guinness Records.

On Oct. 28, four LED posters Crius were chosen to publish information for “2017 Human Resource Forum” and with flexible mobility and fabulous visual effect, Crius wowed audience in the EPD Center of Economics and Management School in Xi’an Jiaotong University. Designed lightweight and slim, Crius supports easy and fast installation. For conference and exhibition information publish and brand exposure, Crius is your first choice. More about Crius, please contact: marketing@qs-tech.com

QSTECH has newly finished the installation of a LED display near the National Monument (Indonesian: Monumen Nasional, abbreviated Monas) in Jakarta, Indonisia. Adjacent to the Merdeka Palace, the location is crowded with tourists of all over the world. This high-profile LED display is Artemis XT series, which is one of the most classic display series of QSTECH. The pixel pitch is 10.66mm and covering an area of 158 square meters. The display has witnessed the grand celebration of 72 rd anniversary of Indonesia Independence Day, and stunned viewers and customers with breathtaking performance and trustworthy reliability.

QSTECH was nominated with honor to arrange reception for the Governor and the Governor’s wife of San Jose Department, Uruguay, along with the First Secretary of Uruguay Embassy in China at the end of September. Top executives prepared warmly and grand reception and introduce the history of QSTECH and the development of LED displays. The Governor Luis Faleiro spoke highly of QSTECH and wish to promote the cooperation on LED related trade.

The display in the photo was installed in Qujiang International Convention and Exhibition Center in 2006. The display is QSTECH’s Artemis series, and is of an area of 205 square meters. Though it was 11 years old, for its great performance and terrific display effect, it was chose to live broadcast 2017 Xi'an International Marathon. According to the very customer, this LED display itself is a miracle for them.

2017 Xi'an International Marathon kicked off on Oct. 28, 2017.

2017 Xi'an International Marathon kicked off on Oct. 28, 2017. Xi’an, one of the world’s most ancient cities, welcomed over 20,000 runners from 26 countries in the event. The track covers 42.195 km and goes through several commercial centers, resorts and universities. QSTECH Co.,ltd, located in Xi’an and serve Xi’an for 25 years, installed 85% of LED displays in Xi’an. Along the track of this Marathon, 16 displays installed by QSTECH have witnessed the runners’ persistence and athletic spirit.

QSTECH’s LED poster

Designed especially for shopping scenes and retail shops, QSTECH’s LED poster Crius now is the hottest choice among small-size LED signage. With light-weight slim body and sleek design of aluminum outer case, Crius offers several flexible installation bases with easy mobility, and the color of exterior frame can be customized to differentiate brands out of crowded competitors. Its Wi-Fi connectivity allows easy fast net-working and convenient content delivery. Compared with LCD signage, Crius offers higher resolution and brightness, thus more eye-appealing and noticeable from near or afar. Crius now is already serving retailers in more than 20 countries. 

Request more info via marketing@qs-tech.com

About QSTECH

QSTECH Co.,ltd, established in 1992, is a professional LED display manufacturer located in Xi’an, China. Aiming at feeding the market with premium quality LED displays since its establishment, the company has served the industry for 25 years and provided products and service to international events, such as Beijing Olympic in 2008. With more than 74 proprietary LED display designs and technical patents, QSTECH is well recognized as the pioneer in LED display development and digital solution providing. The company suppliers a wide range of LED displays for various application, such as indoor and outdoor fixed installation, video walls for control rooms and broadcasting stations, and creative LED solution to enhance brand awareness and media exposure. 

www.qs-tech.com

Segment market of indoor LED display (2)

Stage rental market 

Indoor LED display mainly used in the evening concert, a variety of large-scale activity sites for promotional activities and video live. In this application scenario, customers generally choose the pixel pitch from 2mm to 4mm, and require the video effect is good, the cabinet is quickly installed and disassembled, the structure is stable and reliable.

Transportation market

This market mainly includes airports, high-speed rail stations and other applications, the requirements of LED screen size is flexible (usually from 2m to 10m), mainly for traffic and advertising information release. These customers focus on product stability, reliability and advertising revenue.

Public service market

This market mainly includes hospitals, schools, government departments, etc., LED display is used for showing announcement and guidance information, The range of P3.9 to P6 is generally chosen, and cluster management and play are essential functions.

Video conferencing marketLED display is used in large enterprises, companies and other applications for hold meetings, staff training, business negotiation, etc. The requirements for these customers are clear picture quality on the display, and require exquisite product appearance so that to improve the company grade. The screen size is generally over 6m, and the pixel pitch below 3mm is selected more.

A LED display that focuses on user experience

Recently, LED manufacturers have announced the third quarter results, the results show gratifying performance. However, how to continue to get gratifying performance in this fierce competition for LED manufacturers? In the increasingly mature technology industry, the best way out is to improve the user experience of LED display.

For the LED display, the display effect of the screen, product reliability, operation convenience are the bonus points of the user experience.

On the basis of mature technical ability and industry experience, QSTECH has made great efforts to enhance the user experience in the early stage of HEBE S product planning.

·  Choose a dedicated 14Bit high gray scale and high refresh PWM drive constant current IC, bring wide color gamut, full color picture, good visual effect.

·  Special blanking circuit to protect the LED and prevent sudden leakage, ensure the circuit stability, high reliability and high weather resistance.

·  Magnetic design for front and rear maintenance, to achieve the completely front maintenance with module, power supply, control card, the fast installation and maintenance save labor costs.

The current situation of LED industry development in China

Days ago, Mr.Jiang Fengyi (the winner of First prize of 2015 State Technological Invention Award) from Nanchang University was asked in the interview when he was attending the 19th National Congress of the CPC: What is the current situation of LED industry development in China?

"China's LED technology and industry development is very fast, both technology and industry have entered the world's advanced ranks." He concluded.

On the one hand, in terms of technology, the efficiency of the white light semiconductor industry has reached the world first-class level; from the aspect of monochromatic light, the luminous efficiency of red, orange, yellow, green, blue, blue and purple lights has already reached the international level, among which yellow light LED light effect is the best in the world;

On the other hand, in terms of industry, China is now the largest producer, the largest consumer and the largest exporter of LED. Production scale has exceeded 500 billion yuan (77 billion USD) scale, China's LED application saved nearly 140 billion KW·h, reduced carbon dioxide emissions 0.12 billion tons. LED has made outstanding contributions to energy conservation and emission reduction.

Why China's LED technology and industrial development so fast? In the view of Jiang, it is a benefit from the country's guide, embodies the advantages of concentrating power in our country.

"the government have formulated the overall strategy in the process of LED technology and industrial development, technological innovation and technology to track and layout." He expresses.

“Second is the benefited from the application to promote the development strategy. When the core technology is not mastered, we use core chips from other countries for the application, and make the application up, and then the downstream applications push the upstream and midstream chip development.”

“That's why our LED can grow so fast." Jiang said.

How to ensure the service life of indoor LED screen

1. Keep dry: keep the product dry when using the indoor LED advertisement screen, and don't let the water containing articles and metal articles enter the LED display screen. Avoid moisture that will erode the LED display component, thus causing indoor LED display damage and cannot be repaired.

2. Avoid scraping: when cleaning the screen, avoid water intrusion into the circuit board, resulting in short circuit. At the same time, we should also pay attention to the LED display as far as possible not to collide with hard objects, to avoid the threat to the LED display.

3. Dust cleaning: Indoor LED display should be installed in the environment with better air circulation and less dust. It is also necessary to do routine maintenance work. Regular dust cleaning of indoor LED display screen can improve the display effect; the big dust particles will not only weaken the display effect, but also cause damage to the circuit of LED screen.

QSTECH’s Tips to Leverage Retail Locations and Promote Sales in Holiday Season (Part 2 Outdoor Application)

Confronted wth E-commerce and on-line shopping, companies of retail business are becomingly aware of a shrinking number of customers and declining sales in brick-and-mortar. Changing business environment requires retailers and business owners to make a concerted effort to differentiate themselves and stand out in a crowded and complicated marketplace. The adoption of properly integrated LED displays is highly recommended to retailers, as the vibrant and dynamic LED video screens are proven effective to drive customer engagement and promote better guest experiences.

QSTECH has served LED display industry for 25 years and helped thousands of customers map out their digital strategies. Recently, QSTECH has launched a new LED display series, Crius Outdoor, specifically designed for outdoor commercial application, mainly meant for installation on plazas and squares, on pavements, sidewalks and curb sides for high definition road signage.

Check out some main features of Crius Outdoor series below:
1.Sleek and polished design of aluminum outer casing to meet critical environment requirement and designed anti-sabotage.

2.Crius Outdoor is available in single Side and Dual Side mode option. Crius outdoor can be can be customized into full-color LED display on both sides or full-color LED display on one side and light box on the other.

3.Crius Outdoor is brightness intelligent and boasts a brightness capability ranging from 6000Nits to 8500Nits to overcome the most demanding sun-lighting conditions.

4.Crius Outdoor supports automatic brightness adjustment and is made power saving. Its normal brightness is 6000+ cd/sq.m. and with brightness sensor, the display is enabled to intelligently adjust its brightness through 24/7 and saves much.

5.Crius Outdoor supports easy control; the displays can be controlled via HDMI, Wi-Fi, USB and Ethernet.

6.Crius Outdoor can work alone, as a single piece, and can be cascaded into a display matrix to be controlled as a group.

7.Currently Available in 3 pixel pitch option: 3.9 mm, 5.2 mm, 6.25 mm, and more R & D work is put into product update to ensure this series will continuously serve outdoor commercial and retail application in the long run.

—— Aimee Pei

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