Confusing LED Display Video Resolution

In the high-definition small-pitch LED display to become the mainstream of the market today, we often hear these terms: 1080P, 4K, 8K, etc.,But what does 4K mean?  If 4K is four times greater than 1080p, does that mean 4K is 4320p? The above questions we come to answer you one by one.

'P'

720P, 1080P, etc., that is, "video pixels of the total number of rows", for example, 720P said video 720 pixels, and 1080P means that a total of 1080 video pixels, 1080P resolution camera usually the number of pixels is 1920 * 1080. "P" itself represents "progressive scan", which is an abbreviation for Progressive, relative to interlaced (Interlaced).

'K'

2K, 4K, etc., that is, "the total number of video pixels," such as 4K, said the video has 4000 pixels, specifically 3840 or 4096 columns. 4K resolution of the camera is usually the number of pixels is 3840 * 2160 or 4096 * 2160.

'MP'

MP is the total number of pixels, that is, the number of pixels (P) and the number of columns (K) multiplied by the results (megapixels). For example, the 1080P camera is 1920 pixels multiplied by 1080 pixels, resulting in 2MP (megapixels) of the total number of pixels.

1080p(or full HD)

Well, TVs, on the other hand, have historically used the vertical to describe resolution (going back to the glass tube days). So 1080p is the vertical resolution. Nearly all HDTVs have an aspect ratio of 1.78:1 (16x9, aka "widescreen"), so that means a horizontal resolution of 1,920 pixels (1,920x1,080).

This is another source of confusion, since decades of TV discussions have talked about vertical resolutions, and then all of a sudden we're talking about "4K TVs," which refers to the horizontal resolution.

That means 1080p is not "1K." It's 2K, as much as UHD TVs are 4K. Which is to say, at 1,920x1,080 they're close to the DCI's 2K specification of 2,048. That said, most people don't call 1080p 2K; they call it 1080p or Full HD.

Roughly half the number of pixels of 1080p

4K

We begin with a discussion of the top resolution 4K of the current market, so that we can talk about the basic principles to be answered when we answer the overwhelming majority of the resolutions.

Technically, "4K" means a horizontal resolution of 4096 pixels. this is the resolution proposed by the digital cinema advocacy Alliance (Digital Cinema Initiatives). due to the different aspect ratio of the film, the exact shape of the rectangular screen determines the aspect ratio of the film, so its vertical resolution is not specified.

Therefore, strictly technically, 4K is not ultra HD, ultra HD resolution of 3840 x 2160. the difference between the two pixels is only 13%, basically do not see much difference. the vast majority of people prefer the "4K" this name means ultra HD.

8K truth like 4K. If you are talking about the display, then the horizontal and vertical pixels are two times the 4K display: 7680 x 4320. but the number of 8K video source is not much, we are still very far from the 8K into the mainstream, not alone said a brief talk about the Super Hi-Vision standard resolution of 7680 x 4320 pixels, a total of up to 33 million; in order to better support naked-eye 3D display technology, Super Hi-Vision a picture frame rate up to 120fps standard to watch; distance and perspective mode also has increased dramatically.

2K

The picture shows the number of pixels per major resolution format. Of course, this is not the actual size, just a visual representation.

From the biggest to the smallest: 4 k technology, screen height to width ratio of 1.78:1 (black); UHD (white part); 2 k technology, the screen height to width ratio of 1.78:1 (green); Full hd 1080 p (red); 720 p (blue)

Of course, before "4k" becoming very popular, we almost never seen the word "2 k". It often refers to the "standard format". Digital movie projector resolution are used in most theaters for 2 k (some lower the resolution of the projector). Also, according to the DCI, it specifies the horizontal resolution of 2048, only vertical resolution is not specified.

The display resolution

The display resolution:WUXGA、WXGA、WXXXGA、WXCBGBSA and WXLADYGAGA

In the computer world, people use these convoluted, shocking the user friendly letters to describe the resolution of chaos. Oh, that is wrong, not shocked "people", after all they are computers

Basically, we are most likely to see is FHD (1920 x 1080) and the WUXGA (1920 x 1200). The rest of the few, You can prepare yourself a copy of the memorandum copy down memory. Fortunately, we are only looking for a cheaper projector or computer monitor will meet these letter combinations.

Jerry--6inch time and tem sign

LED Gas Price Sign introduce - Alice from Glare-LED

One of Professional Manufacturer of LED Gas Price Signs and Changers for Gas Stations

At end of the 2016 years , we had the order for the Big size led gas price signs 42inch 8.88 9/10 in bulk. The color we had in RED/AMBER/BLUE/GREEN/WHITE,Usually clinets choose the RED /Green For the UNLEADED  Price And DIESEL pirce. See below:

LED Gas Price Signs are super bright and help distinguish your gas station Brand from the competitors VALUE - our LED fuel price signs are designed to look bright and clear from far away, making your gas station stand out.we can guarantee the highest quality for all our LED signs and GPC's, at the very best price.

INNOVATION - while Gas Price Changers have been in use for many years, the technology driving them has been comparatively slow to evolve. Since 2009, Glareled Technologies has been offering solutions based on the latest and most efficient technologies available, bringing to gas station operators LED Gas Price Signs that are much lighter, brighter, slimmer, economical, and durable than any of our competitors

We sell top quality technologically advanced Wireless Remote Control Keyboard Programmable Gas Price LED Signs at the Lowest Prices. We sell direct to Gas Stations and we are a supplier to many sign stores across the USA and South America, Japan, Iraq, Dominicana, Mexico. Cameroon, Laos ,Germany ETC.

Our signs are very easy to install and they come ready to go with everything you need.

The  difference  of the 36inch , 42inch,48inch 72inch to the smaller size 10,12,16 inch etc: Using the pixels cluster designs for the 8 , as below:

Different than the PCB Designs(8inch, 10inch,12inch,14inch,16inch,18inch,20inch,24inch,32inch.etc)

GLARELED’s China made numeric displays make a lasting impression by using the biggest, boldest and most reliable digits available in the industry. Available in sizes range from 4.5in to 114in tall and use the finest +100,000 hour rated LEDs. From Highrise to PumpTopper, Glareled has the right sign for the job.

Usage : The Pixels cluster designs can be using in the higher place,

1) FUEL

Fuel pricers have just seconds to get noticed by motorists.

2) LOTTERY

Glareled builds the boldest and brightest digits in the industry, built to do more than just get attention, they’re built to last.

Unrivaled quality and elite maintenance programs ensures the industry’s shortest downtime. Rest assured your current jackpots will reach players via LED billboards, Streetsigns or PumpToppers, or even off the grid with TallDigit mechanical displays.

Now, available with Million/Billion changeable labels.

3 )Hotel

show the hotel price :

Sell out every night.

Tell road weary travelers you are at the next exit and ready to serve their needs with hotel room rate display. Red, amber, blue, green or white LED digits will help your business stand out brighter than the rest.

4) TIME + TEMP( Projects in Australia)  OR THE Countdown / count up.

Glareled's Time + Temperature displays are available in red, green, blue, amber, or white LEDs, and digit sizes ranging from 10in to 114in. Choose 12 or 24 hour time display, and Fahrenheit or Celsius temperature display. With a -30C to +50C operational temperature range, auto dimming, and auto time updates, via a Garmin GPS unit for accuracy and low power consumption they are high visibility, low maintenance landmarks.

Productions :

5) ER

Boldly display your efficiency with the ER wait time display. Displays pull from your RSS feed to automatically update from your ER wait time and share it with passing motorists.

Make sure your community knows where to go when minutes count.

SUMMARY:  

LED Gas Price Changers are offered with the following features:

Illumination: RED/AMBER/BLUE/GREEN/WHITE

Digit Sizes In Stock: 10” 12” 16” 18” and 24” characters.

Pixel cluster design size:36inch,42inch,48inch,72inch etc.

Wide 140 degree viewing angle.

Traffic LEDS

Wireless remote with a 350 ft. range for controlling the sign.

Getting An LED Gas Price Changer?

Gas stations that want to show off their brand new equipment, as well as cut employee chores significantly, are always looking for new ways to improve their station’s crisp, clean, and advanced appearance. Our gas led display signs are not only much less hassle than the old school method of hanging up large number signs, but also help improve the overall look of a gas station’s exterior. Here’s what every gas station owner should consider when deciding to get an LED gas price changer.

The LED Display Application in Traffic Display Area

Tag: traffic display area,LED traffic sign,variable message signs,led speed limit sign,led vms display

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With the continuous development of LED display technology, LED display application range is more and more widely, Large screen rental businessman said that, LED display applications are particularly more and more widely in the traffic display field recent years. So, how LED display to use in traffic?

Traffic alerts

As all we know, road traffic conditions change rapidly, therefore, traffic tips is particularly important. In order to help the driver to grasp the traffic information better, rapid road selection, large screen rental businessman think that in some of the main road sections set up traffic information real-time broadcast LED display is very important. Moreover, with such a prompt, but also can reduce the occurrence of many security incidents, which for the maintenance of social security is still very helpful.

Ad push

When driving on the road, especially on the highway, we will always see a lot of huge advertising billboards, pushing the above are real estate, cars, alcohol and tobacco products such as high-profit advertising. Large screen rental businessman told us that before this type of advertising and more giant cloth billboard form. With the emergence of LED large screen, so that the push more flexible advertising, the effect is more excellent, compared to the traditional cloth billboards are more durable.

Information Publish

In the view of the big screen rental businessman, LED screen display information on the traffic road, in the dissemination of a certain degree of coercion, so dissemination of information here is very high, the use of this feature for the dissemination and publish of important information is also perfect, so this is also the LED display on traffic display more and more widely use, is an important reason in the led traffic area.

As a global traffic LED application solution supplier and brand leader, Glare-led traffic LED display has a first-class ventilation and waterproof system to protect the display from rain damage, also have good heat dispersing performance, aviation head steady power supply and the rate of high-refresh rate to prevent the image flicker, so that our products have a better price in the industry.

LED display four advantages and optional reference

LED display act as a important role in security monitoring areas, marketing development impact the direction of the security industry directly. LED outdoor display gain an unparalleled advantage in the development of intelligent transportation, is an important direction of LED area development. With the development of LED technology, LED display products are widely used in commercial advertising, live broadcast, traffic induction, stage deduction and other fields. 

LED display four advantages:

In the outdoor advertising market, LED large screen advertising has become an important outdoor advertising communication media with the advantages of strong relevance with target consumer groups, strong visual impact of performance, advertising updates flexible, Low labor costs, popular with customer and high coverage.

Compared with the LCD brush machine, LED display advantage is mainly reflected in the following points:

1. the area of ductility, LCD area is difficult to achieve a large seamless stitching, LED display can be extended, and seamless splicing.

2. LCD plasma screen brightness decay quickly, generally , you need to replace it after running a year or half of year but the LED display canoperating at least five years the same conditions.

3. LED scrubbing machine can use interactive technology to enhance the brush machine as the advertising media and the interaction between the advertising audience, such as custom touch screen, broadcast technology to achieve cloud management management.

4. In terms of display, LED display of high brightness, wide viewing angle and good color reproduction capability is also better than the LCD screen. LED flash screen machine is generally used in airports, shopping malls, hotels, high-speed rail, subway, theater, exhibitions, office buildings, target customers with high consumption level, having great advertising value.

LED display optional reference:

LED production process requirements are high, not all companies have the appropriate strength, resulting in the quality of the market LED display varies greatly. LED lamp optical system design requirements are very precise, LED tube and condenser cup size is very small, the relative position of the two with a higher requirement, a small deviation, the light to reach the stage location will be a big gap. In order to meet the design requirements, the process requires manufacturers make a large number of LED tube consistency screening, taking into account the LED tube in the circuit board welding slurry thickness of the gap, manufacturers will use automated laser welding process.

In addition, the heat dissipation issue directly affects the LED luminous efficiency. Normally, high-quality LED display solve the heat problem in the design and process , The led have more than 30,000 Hours Lifetime, but the design or poor process LED display may be only a few thousand hours or even shorter life.

From the advanced automatic operation machinery to the strict quality control of the production process (including the aging of the middle parts), every link affects the LED display.

For the enterprise Professional development, design, strict production management, the selection of components, materials, advanced automation machinery, and the strict quality control production process (including the Product components of aging ), each process affects the LED display quality.

So how to identify the LED screen is good or bad? The following points hope to bring you some ideas.

1. Surface flatness:

Screen surface roughness to within + / - 1 mm, to ensure that the display image is not distorted, local convex or concave leads to display the visual Angle of corner. The stand or fall of flatness is mainly decided by the production process.

2. Brightness and viewing angle:

Indoor full color LED display brightness to above 800 CD/m2, outdoor full color brightness to above 1500 CD/m2, to guarantee the normal work of the screen, otherwise it will because the brightness is too low and can't see shown in the image. Mainly by the size of the brightness of LED tube core is good or bad decision. Viewing angles directly depends on the size of the display screen of the audience, and the bigger the better. The size of the viewing Angle is mainly composed of tube core encapsulated way to decide. 

3. White balance effect:

The white balance effect is one of the most important indicator display. Chromatology on red, green and blue color for the proportion of 1:4. Lost. 16 will only show the pure white, if the actual rate is a little deviation will appear white balance deviation, generally pay attention to whether there is a slant blue, white slant yellow phenomenon. The stand or fall of the white balance is mainly composed of display control system to determine, tube core of color reducibility may also be affected.

4.Color reducibility:

Color reducibilityis refers to the display of color reducibility, the color of the display shows both to maintain highly consistent with the colour of the source, so as to ensure the image sense of reality.

5. For the Mosaic, dead center

Mosaic refers to appear on the screen normally on or often black small four squares, both module necrosis phenomenon, the main reason for the display of connectors quality closes nevertheless. Dead point refers to appear on the screen normally on or black often a single point, how many of the dead point mainly determined by the stand or fall of pipe core.

6.Color piece:

Color piece is refers to the adjacent modules between relatively clear off color, color transition in module, color piece phenomenon caused mainly by the control system is poorer,grey level is not high, caused by lower scanning frequency.

HD LED Display Brought The Challenges to the LED Chip (Part 2)

Chip-side solution

1. Reduce the size of the chip size reduction

On the surface, is the problem of layout design, it seems that as long as the need to design a smaller map can be resolved. However, the chip size can continue indefinitely down? the answer is negative. There are several reasons to limit the extent of chip size reduction:

(1) packaging processing restrictions. During the packaging process, two factors limit the size of the chip. First, the nozzle limit. Solid crystal need to draw the chip, the chip must be greater than the short edge of the nozzle diameter. There are currently cost-effective nozzle diameter of 80um or so. Second, wire restrictions. First, the wire electrode that chip electrode must be large enough, otherwise the reliability of wire can not be guaranteed, the industry reported minimum electrode diameter 45um; followed by the distance between the electrodes must be large enough, otherwise the two must be mutual interference between the wire.

(2) chip processing restrictions. Chip processing, there are two restrictions. One is the layout layout limitations. In addition to the limitations of the package end, the size of the electrode, the electrode spacing is required, the electrode and the MESA distance, the width of the road, the boundaries of different layers have their limits, the current characteristics of the chip, SD process capability, lithography processing capacity Determines the scope of the specific restrictions. In general, the minimum distance from the P electrode to the edge of the chip is limited to 14 μm or more.

The second is the ability to crack processing constraints. SD scribing + mechanical lobe process has a limit, the chip size is too small may not be lobed. When the diameter of the wafer increases from 2 to 4 inches, or to 6 inches in the future, the difficulty of dicing the lobes increases, that is, the chip size can be processed increases. 4 inch chip, for example, if the chip length of less than 90μm short side, aspect ratio greater than 1.5: 1, the yield loss will increase significantly.

Based on the above reasons, I boldly predicted that the chip size reduced to 17mil2, the chip design and process capability close to the limit, the basic no longer reduce the space, unless the chip technology solutions have a big breakthrough.

2. Brightness boost

Brightness enhancement is the eternal theme of the chip side. Chip factory through the extension of the program to optimize the quantum effect, through the chip structure adjustment to enhance the external quantum effect.

However, on the one hand chip size will inevitably lead to reduce the size of the light-emitting area, chip brightness decreased. On the other hand, small pitch screen dot pitch narrow, single-chip brightness demand has declined. There is a complementary relationship between the two, but to leave the bottom line. At present, chip-side in order to reduce costs, mainly in the structure to do subtraction, which usually have to pay the cost of reducing brightness, so how trade-off is the industry to pay attention to.

3. Consistency at low current

The so-called small current, is relatively common indoor, outdoor chip trial current is. As shown in the following diagram, the chip I-V curve, the conventional indoor, outdoor chip work in the linear work area, the current is large. The small pitch LED chip needs to work near the zero point of the non-linear work area, the current is too small.

In the non-linear work area, LED chip by the semiconductor switching threshold, the difference between the chip is more obvious. It is easy to see that the discrepancy of the nonlinear workspace is much larger than that of the linear workspace, because of the analysis of the brightness and wavelength dispersion of the high-volume chips. This is the inherent challenge of the chip side.

The way to deal with this problem is to optimize the direction of the epitaxy to reduce the lower limit of the main linear work area; followed by the chip on the optical optimization, the different characteristics of the chip to distinguish.

4. Parasitic capacitance consistency

At present, there is no condition on the chip to directly measure the capacitance of the chip. Capacitance characteristics and the relationship between conventional measurement items is not clear, the industry has to be summed up. Chip-side optimization of the direction of the epitaxy on the one adjustment, one sub-file on the electrical refinement, but the cost is high, not recommended.

5. Reliability

Chip-side reliability can be described in the chip package and the parameters of the aging process. But overall, the reliability of the chip on the screen after the impact of factors, focusing on ESD and IR two.

ESD refers to antistatic ability. According to IC industry reports, more than 50% of the chip failure and ESD. To improve chip reliability, must enhance the ESD capability. However, in the same wafer, the same chip structure, the chip size will inevitably bring smaller ESD capacity weakened. This is directly related to the current density and chip capacitance characteristics and can not be resisted.

IR is the reverse leakage current, usually measured at a fixed reverse voltage reverse current value of the chip. IR reflects the number of defects within the chip. The larger the IR value, the more the chip is defective.

To enhance ESD performance and IR performance, must be epitaxial structure and chip structure to make more optimization. In the chip sub-file, through strict sub-file standard, you can effectively put the ESD performance and weak IR chip removed, thereby enhancing the chip on the screen after the reliability.