HDR emerged in the broadcasting industry and gradually expanded to the mobile device side. The introduction of this concept and technology in the LED display field is relatively lagging behind. Novastar is a pioneer in the field of LED display and an early technology implementer as an HDR technology, aiming to bring a better picture quality experience to customers.
What is HDR
We are in a colorful world. In order to present this colorful world through the display screen, humans have invented various devices such as cameras, cameras, televisions, etc., and have developed many advanced technologies,HDR is one of them. .
The HDR full name is a “High-Dynamic-Range”, ie high dynamic range image technology. This technology was first applied to photography, and HDR was turned on during the photo process to make the original dark scene brighter and more transparent. Now, HDR technology has been applied in various aspects such as home appliances, smart terminals, etc. The LED display field has also begun to truly experience the advantages brought by HDR technology because of Nova Technology.
What can HDR bring?
Take the TV for an example. The range of brightness that traditional TVs can exhibit is extremely limited, far from what the human eye can perceive. The reason is that the brightness of the traditional TV in the bright part of the picture can not be raised, the darkness can not be dark. This leads to a poor sense of layering in the final perception of the human eye, and a large amount of detail is lost.
HDR super-quality display technology can solve this problem perfectly. HDR has higher pixel loading: 3840×2160 compared with the mainstream SDR 1080P display technology currently on the market; wider gamut range: BT2020. The same picture can display more color information, more details of the image texture. At the same time, with the addition of more advanced electro-optical conversion technology, the light and dark contrast of the picture is improved in all directions, so that one picture can display the most realistic appearance in all directions.
In the LED display industry, Novastar Technology took the lead in making video processing equipment that supports HDR source analysis, driving LED display into the HDR era.
HDR is better than SDR for display
As you can see from the above image, the HDR image on the right shows more highlights and shadow details. The human eye looks more full and the color transition is smoother.
5 dimensions of image quality improvement
As a leader in the image processing industry, SONY has announced the standard for ultra-high definition quality, including five dimensions: resolution, color depth, color gamut, contrast and frame rate.
The Ultra HD Blu-ray standard requires a resolution of 4K, a color depth of 10 bits, and a color gamut of BT.2020. Contrast is the requirement for HDR, and the frame rate is 60 fps.
The following is the most difficult to understand color depth and color gamut:
HDR color depth
The Ultra High Definition Blu-ray standard specifies a color depth of 10 bits, which means it can display 1.07 billion colors.
Each color in RGB has 2 to the power of 10, which is 1024 levels. RGB three colors have a total of more than 1.07 billion (1024 × 1024 × 1024) color matching.
The ordinary Blu-ray standard SDR supports 8bit color depth, only 16.77 million colors, and the gap is wide. In other words, through the 10-bit output, the color is richer and fuller, and the color transition is smoother than the 8-bit.
HDR color gamut
Another concept corresponding to color depth is called color gamut. The former indicates the number of colors that can be displayed, and the latter indicates the range in which the colors can be displayed.
Human eye, HDR, SDR color range contrast
At present, the display color gamut covered by the civilian LCD / OLED screen is probably BT.709, which is equivalent to the 95% NTSC color gamut promoted by mobile phone manufacturers (72% NTSC = 100% sRGB). In the past two years, many mobile phones and laptops have begun to support the DCI-P3 color gamut, while the HDR color gamut standard is BT.2020.
The color reproduction range of BT.709 and BT.2020 is as shown below. The BT.2020 color gamut of the HDR standard is far more than the existing SDR color gamut, which can display a richer color range for the entire image in terms of color gradation and transition. Enhancement played a key role.
In the HDR standard that has been released, the color depth and color space are specified accordingly. The overall improvement of these parameters has led to a “better pixel” display.
What are the HDR industry standards?
HDR10 is currently the most popular HDR standard and is a mandatory format for the Ultra HD Blu-ray specification. The HDR standard supported by most HDR display devices refers to HDR10, which is also supported by Nova Technology.
HDR10 was announced by the American Consumer Technology Association on August 27, 2015 and has received support and recognition from monitors and TV manufacturers such as Dell, LG Samsung, Sharp, Sony and Vizio. Sony’s PS4 and X Box One S game consoles already support the HDR10 standard.
The HDR10 standard specifies a set of conditions for image restoration capabilities, including the 10Bit color depth and the BT.2020 color space we mentioned earlier. In addition, the display brightness is at least 1000 nits. Only when these conditions are met can you claim to be HDR10.
HLG is a “Digital Program Delivery” HDR standard jointly developed by British BBC Broadcasting Corporation and NHK, and its full name is Hybrid Log-Gamma (Mixed Logarithmic Gamma), which was launched in May 2015.
When developing HLG, BBC and NHK took into account the biggest problem of broadcasting “transmission bandwidth”. HLG has no metadata part, it combines HDR signal into TV broadcast signal, compatible with current broadcasting equipment, and has no license fee. problem. Therefore, it is suitable for digital broadcasting of cable/satellite TVs, even live broadcasts, so that people can enjoy HDR effects when watching programs at home.
This is an ultra high definition Blu-ray TV standard developed by Dolby Laboratories. Unlike the open source HDR10, only Dolby Laboratories-certified devices can claim to support the Dolby Vision standard. The certification process requires payment to Dolby, and these costs are also indirectly calculated into equipment costs. Therefore, devices that support the Dolby Vison standard are generally expensive.
The color depth of the Dolby Vision standard is further increased to 12Bit, and the display needs to meet at least 4000 nits. The TVs that already support Dolby Vision ultra-high definition display are Sony, LG, etc.
What is the HDR requirement for the display?
The peak brightness of the display is ≥1000 nits
The minimum brightness of the display is ≤0.05 nits
Covering more than 90% of DCI-P3 color gamut space
The effect of high brightness is not only “shaking”, but also brings more rich colors.
To understand the display, we have to stereoscopically quantify all the concepts. A chemical reaction can also occur between brightness and color. For example, real-world fireworks, the center of the fire is colored, but if you use a display device with a lower brightness range to reproduce the scene, the color of the fireworks and flare center may not be expressed, it will only be a pale . This is because each brightness level contains different colors.
High brightness is only one quadrant of the dynamic range of the brightness, and the other is extremely low brightness, which can give a deeper black. There is also a good level of control between this extremely high and very low brightness, which is the basic condition for implementing HDR technology. With this extreme brightness and level control, the color expression at extreme brightness can be more accurately expressed. The larger the range of brightness that can be accommodated, the more layers of brightness will be, and the same color, gray level information will be more abundant.
LEDs have the advantage of a high brightness range that LCDs cannot match. In the gamut range, LEDs are also wider than LCDs. In the past, the biggest bottleneck restricting the application of HDR technology in the LED industry was that there was no processing system capable of handling HDR dynamic range. Now, as an LED innovator in the LED display industry, Novastar is the first to develop a control system for processing HDR sources, which completely solves the problem of HDR application in the LED field.
The future of HDR technology
HDR is not an isolated technology, it specifies the source of the chip, hardware decoding, and screen display requirements for image signal processing. Therefore, the implementation of HDR technology requires a chip source, a hardware decoding device, and a display device linkage to form a processing system to achieve the final display quality together!
Currently, HDR is the most widely used in the LCD industry. However, due to the lack of brightness of the LCD display, this innate technical bottleneck makes HDR not always achieve the best results in the LCD industry.
Although the LED industry has the brightness advantage that LCD can’t match, why is the LED industry not using HDR? As mentioned above, this is because the LED industry has not previously been able to handle the processing system of the HDR source, and thus has been restricting the LED industry’s application of HDR technology!
Now, with Nova Technology’s pioneering technology in HDR video source processing, coupled with the LED industry’s display of HDR brightness advantages, it has truly achieved a leap in the quality improvement of the LED industry!
In the future, HDR technology will be introduced into the 8K and even higher standard display by Nova Technology, combining “better pixels” with “more pixels” to redefine the display and lead the value upgrade of the entire industry.
A more realistic picture brings a more realistic experience, and a more realistic experience brings a more perfect communication effect, which in turn drives up the media value. In the HDR era of LED display, Novastar brings it!
The small-pitch full LED display refers to an indoor LED display with LED dot spacing below P2.5. Compared with other indoor display devices, the small-pitch LED display has the advantages of seamless splicing, modular maintenance, natural color, better display uniformity and wider gamut space. The small-pitch LED display has an indoor display market. Huge potential.
But at the same time, small-pitch displays also face many challenges. Display effect (such as afterglow, first sweep dark, low gray, red, low gray, uneven brightness, etc.), large resolution loading, stitching gap has always been the bottleneck of high-density small-pitch full LED display, limiting small spacing LED display application. In response to the above problems, the corresponding solutions are given.
Inhibition effect on afterglow
The first sweep is no longer dark
The effect of dealing with the first sweep dark problem
Low ash is no longer reddish
The effect of low gray and reddish
Low gray brightness uniformity
The effect of uneven brightness on low gray
It can be seen from the above processing effect picture that the application of the Nova control system, supplemented by a good light board design, can solve the afterglow, the first sweep is dark, the low gray is reddish, the low gray unevenness and the like are given to the display. The impact.
As the dot spacing becomes smaller and smaller, the display screen needs more and more receiving cards, but the box space is limited, which makes the design of the display box structure more and more difficult, and the display indicators are also affected. To solve this problem, a new receiving card has been specially developed for small pitches.
This is the 270 series receiving card specially developed by Nova for small-pitch display. Its optimal load-carrying area is doubled compared with the ordinary receiving card, reaching 256X226 output data sets up to 24 sets, which is 75 times higher than ordinary receiving cards. %. At the same time, it is equipped with the fourth-generation color processing engine of Nova, and the color processing depth reaches 18-bit large capacity and powerful color processing capability.
On the sending side, to simplify the control system architecture,
Nova has developed LED Pro HD.
For 1080P full HD display, the common control system requires multiple devices, and with MCTRL600, one is enough, and the system architecture is greatly simplified.
At the same time, in order to further enhance the display effect, we adopted the HDMI interface on the MCTRL600, and the input gray level reached 12 bits (the DVI input gray level of the common controller is only 8 bits), which makes the gray level fineness increase by 16 times. This ensures that the display has excellent display quality from the source.
It is worth mentioning that the Nova600 series controller is the only controller in China that legally supports HDMI and HDCP.
These are Nova’s oversized and high-order inputs. It can effectively remove the structural limitation of the small-pitch display, reduce the complexity of the system architecture, and ensure high-quality display quality.?
Stitching seam elimination
The Nova Point-by-Point Correction System is a commonly used calibration system on the market.
The stitching seam is a stubborn disease of the small-pitch display, which is manifested by the presence of bright and dark lines on the display screen at the seam. This is due to the characteristics of the display itself and is difficult to solve by process and structure. The stitching seam problem is solved by implanting a special processing algorithm in the Nova Correction System.
The correction effect of the nova correction system on the splicing seam: the bright dark line is eliminated, and the whole screen is smooth and clean.
Correction effect of the Nova correction system on the stitching seam: the bright dark line is eliminated, and the whole screen is smooth and clean.
High speed correction
For a single correction area, from the original 192X128 to 960X640, a full 25 times improvement;
For the time-consuming calibration, take the 960X640 display as an example. In the normal calibration mode, it takes 82 minutes. With high-speed correction, it only takes 17 minutes and the correction speed is increased by 5 times!
This is the high speed correction of the new star.
Stitching correction and high-speed correction enable the display to achieve good consistency quickly and efficiently, thus ensuring high-quality display quality of the display.
The above is the small spacing solution that Nova brings to everyone:
>> G4 processing engine improves color processing accuracy
>>Small pitch platform, lifting the space volume limit
>> 1080P, simplified system structure
>> HDMI high level input, ensuring fine quality from the source
>>New generation correction technology solves the stagnation of stitching seams and greatly improves the correction efficiency.
LED video processors are also known as image processors, image converters, video controllers, image processor image converters, video format converters, independent video sources, and the like. The LED video processor is the key device for the birth, growth and maturity of the image processor LED full color display. The advantages and disadvantages of the LED video processor directly affect the display effect of the LED display. The combination of the LED video processor and the display greatly facilitates the wide application of the end user and improves the depth of use of the LED display.
Full-color LED multi-screen video image processor is a full-color LED high-performance image processing controller launched by national high-tech enterprises. The device integrates years of experience in video image processing, HD signal processing and display. The patented hardware design combines the special requirements of full-color LED screen display to simultaneously receive and process a variety of different video graphics signals. And displayed on the full color LED display.
So how does the LED video processor work, you know? Let me introduce you to the following small series.
1, resolution specification conversion: In general, image sources (such as Blu-ray DVD, computer, HD player, etc.) provide fixed signal resolution resolution (refer to VESA, ITU, SMPTE, etc.). And the modular spliced ??display of the LED display screen allows its resolution to reach almost any value. The video processor converts the various signal resolutions to the actual physical display resolution of the LED display.
2, color space conversion: LED display color gamut is very wide, and the color space of most image signals is relatively small (such as NTSC). In order for an LED display to have an excellent image display effect, color space conversion is required.
3, the bit depth is improved: the current gray level of the LED display has been increased to 16 bits, 17 bits, however, the input signal source is mostly only 8 bits. Therefore, with the advent of the high-definition display era, the application of 10-bit or even 12-bit processing technology in video processors has become an unstoppable trend.
4. Zoom: During the resolution specification conversion process, the image needs to be scaled. The full image can be displayed on the screen regardless of whether the resolution is increased or decreased.
5. Image Processing and Enhancement Technology: Digital image processing technology has developed from the 1920s to the present, and a large number of patented technologies have appeared. For example, DCDi, ACC2, ACM3D and other Emmy-winning Faroudja laboratories have a range of patented technologies. These techniques undoubtedly greatly enhance the visual effect of the image.
Xi’an Novastar:The most popular video processor on the international market today,and have technical services on many continents and in more than 50 countries. The website is:http://www.novastar-led.com
Shenzhen VDwall; the main processor suppliers, the market occupies a larger export volume is also large, the site is: http://en.vdwall.cn/
Shenzhen Speedleder (http://www.jstron.com/)
Shenzhen Magnimage (http://www.magnimage.com/),can do a large monitor
Beijing Kystar (http://www.kystar.com.cn/en/),
Beijing Shiruxun (http://en.shiruixun.com/)
Xiamen RGBlink (http://www.rgblink.net/en/)
LED display screens have a widely chosen LED video processor.They are required for TV relay centers, exhibitions, meetings, large-scale stage and theatre etc.! If you’re going to input more signal sources than computers only, and if you’re seeking for the low cost solution, our LED video processor would be a suitable choice.
In addition several main card companies, also have the corresponding video processors to sell, the effect is good.
Asynchronous cards: Mainly some WIFI cards or small area for led screen controller card?.
Xixun (http://sysolution.net/) and sheenled (http://www.sheenled.cn/), which are mainly WIFI features offline full color led display card, qualifications are relatively early.
There are Huidu (http://www.huidu.cn/index.php?lang=en), more offline use of small color screen, Southeast Asian market with more.
Listen (http://en.listenvision.cn/), is also a rising star, before making a single color small?screen card, and now the color, and sports control system, Southeast Asia market more.
There is Onbon (http://www.onbonbx.com/index_en.html) single-color led controller board compared to the most stable, the price is relatively high
lytec and LuMen, two old single-color dual-color led screen controller card, a lot of government-designated
LongGreat (http://www.led595.com/), more used in Taiwan
ZH, China, the price is more favorable, China and Southeast Asia with a lot.
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