HDR 10 LED DISPLAY

Sep 23, 2022 | knowledgebase | 0 comments

HDR stands for High Dynamic Range, which is a technique of capturing, processing and displaying images that have a much wider range of color and contrast than standard dynamic range (SDR) images. HDR images can show more details in both bright and dark areas, as well as more vivid colors, making them more realistic and closer to what the human eye can perceive. HDR is often used in photography, video games, movies and TV shows to enhance the visual quality and immersion of the content.

SDR VS HDR LED DISPLAY copy

There are several HDR industry standards that define the technical specifications and requirements for HDR content creation and display. Some of the most common ones are:

  • HDR10: This is an open-source HDR standard that is widely supported by most HDR display devices and media platforms. It was announced by the Consumer Technology Association in 2015 and requires a 10-bit color depth, a BT.2020 color space, and a minimum display brightness of 1000 nits.
  • HLG: This is a HDR standard developed by the BBC and NHK for digital program delivery. It was launched in 2015 and does not use metadata, but rather combines HDR signals into TV broadcast signals. It is compatible with current broadcast equipment and has no licensing fees. It is suitable for cable/satellite TV and live broadcast.
  • Dolby Vision: This is a proprietary HDR standard developed by Dolby Laboratories that requires certification and payment. It was launched in 2014 and offers a 12-bit color depth, a BT.2020 color space, and a minimum display brightness of 4000 nits. It also uses dynamic metadata to optimize the HDR image quality for each scene. It is supported by some TV manufacturers such as Sony and LG.

Four requirements for HDR video to be realized, specifically for the HDR10 standard. 

  • 4K resolution, which means they have 3840 x 2160 pixels. This is four times more than the standard HD resolution of 1920 x 1080 pixels. Having more pixels means having more clarity and sharpness in the image, which is essential for HDR.

 

color gumut requirement for hdr led screen
  • High contrast ratio, which means it can show a big difference between the brightest and darkest parts of the image. For HDR10, the display device must be able to produce at least 1000 nits of brightness, which is a measure of how bright a screen can get. It must also be able to show blacks of less than 0.05 nits, which is a measure of how dark a screen can get. Having a high contrast ratio means having more details and depth in the image, which makes it more realistic and vivid. LED displays are very good at achieving high contrast ratios, unlike some other display technologies.
HDR led display brightness and contrast ratio
  • 10-bit color depth, which means they can show 1024 shades of each of the three primary colors (red, green, blue). This is much more than the 8-bit color depth of standard video, which can only show 256 shades of each color. Having more shades of color means having more smoothness and richness in the image, which avoids the problem of “banding” or “stepping” between colors. It also means that some parts of the image can be very bright without affecting the rest of the image, such as the sun, a flash, or a fire.
color gamut BT2020
flip chip cob led display 0.9 1.25 1.56

FLIP-CHIP COB

LED Display Contrast Ratio

Sep 23, 2022 | knowledgebase | 0 comments

LED Display Contrast Ratio Definition

According to the definition of industry-standard SJ/T11281-2007 “Light Emitting Diode (LED) Display Test Method,”Contrast is a term that describes how bright or dark the image on an advertising LED screen is. It is calculated by comparing the brightness of the white and black colors on the screen. The contrast ratio is a number that shows how much brighter the white is than the black.

For example, an LED display contrast ratio of 1000:1 means that the white is 1000 times brighter than the black. The higher the contrast ratio, the more clear and colorful the image is. The lower the contrast ratio, the more dull and blurry the image is.

High coåntrast cob flip chip led wall
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Static and dynamic contrast ratio

: The contrast ratio can be measured in different ways, such as static contrast ratio and application contrast ratio. The static contrast ratio is measured in a completely dark room environment, and it is usually very high, as high as millions to one. The application contrast ratio is measured at an ambient illumination of 10±10% lx, and it is more realistic and practical. According to industry standards, an LED display application contrast ratio greater than or equal to 5000:1 is the highest level of C.

 Different Contrast ratios Among COB, GOB, SMD led displays

SMD LED Display: Black SMD LEDs VS White LED Screen.

Black SMD LED in small sizes, make them perfect for incorporation into instruments and devices. The smaller the chip size, the higher the contrast ratio of the LED display. This is because a smaller chip leaves more black space on the display, which reduces the brightness when the LED is off. Even though a smaller chip also reduces the brightness when the LED is on, the contrast ratio still increases significantly.

Black LEDs have a higher contrast ratio than white LEDs, which means they can produce darker blacks and more uniform colors. The contrast ratio of black LEDs is 8000:1, while the contrast ratio of white LEDs is 3000:1.

  • Power consumption: Black LEDs consume less power than white LEDs, which makes them more energy-efficient and eco-friendly. The power consumption of black LEDs is 350/m2, while the power consumption of white LEDs is 410/m2.
  • Brightness: White LEDs have a higher brightness than black LEDs, which means they can be more visible in bright environments. The brightness of white LEDs is Max. @2000cd/m2, while the brightness of black LEDs is Max. @1500cd/m2.
  • Display effect: Black LEDs can display black or gray colors more accurately and smoothly than white LEDs, which can cause distortion or noise in the same colors. Black LEDs have more stable and softer colors, although less bright than white LEDs.
high contrast black led with white led

Contrast Ratio: GOB LED Display VS SMD LED Display

High contrast GOB and black smd

LED Display Contrast Ratio: COB VS GOB

The contrast ratio of the COB led screen is higher than the SMD and GOB led screens. This is because the COB package does not use a bracket structure to support the chip device, which limits the size of the package body and the light-emitting pixel point. The COB package can use smaller chips according to different viewing needs, which increases the black area on the display and improves the contrast.

cob-led-display-visionpi-painting high contrast ratio copy
cob led display contrast ratio

LED Display contrast ratio Flip chip COB vs Lateral Chip COB 

The LED display contrast ratio of the flip-chip is higher than the front-mounted chip. This is because the flip-chip does not have electrodes and bonding wires on the light surface, which occupy part of the area that should be light. The flip-chip also has a larger light-emitting area and a higher luminous efficiency. This makes the LED brighter when it is on and darker when it is off, which enhances the contrast.

lateral chip cob vs flip chip cob

High Contrast COB LED Display

As aforementioned, the importance of high contrast for mini LED displays is obvious. The combination of full flip-chip and COB packaging technology of the mini LED display is an outstanding contribution to improving the contrast. Therefore, a full flip-chip COB display will be the best solution for a high-contrast ultra-fine-pitch LED display.

flip chip cob led display 0.9 1.25 1.56

With several years of experience as the leading mini LED display manufacturer in China, VISIONPI offers COB LED displays with high contrast, high brightness, high color, high definition, and other excellent performance. For instance, our COB series displays have achieved a contrast ratio of 15,000:1 while offering affordable prices. Therefore, our COB series mini LED displays can showcase unparalleled display effects to enrich users’ viewing experience. 

Pixel pitch covers P0.4-P1.8 to meet different requirements of users

  •  1,200nits brightness
  • 18Bit grayscale
  •  up to100,000:1 contrast ratio
  •  120% NTSC color gamut
  •  7,680Hz refresh rate
  •  Extremely high protection performance
  • Single Module Calibration Technology
  • onforms to industry standards and specifications
  • Self-developed optical display technology greatly protects the eyes
  • Multi-scene applicability

High Contrast Outdoor LED Display

The high contrast outdoor LED display designed to perform under direct sunlight incorporates features that optimize visibility and readability, even in challenging lighting conditions. Here’s a closer look at why black LED technology stands out and how it contributes to enhancing display performance in outdoor settings:

Outdoor Black LED Display Advantages

1. Higher Contrast Ratio: By using black LEDs, the display achieves a much darker black than traditional white or grey LEDs. This results in a significantly higher contrast ratio.

2. Sunlight Readability: Traditional LED displays can become washed out under direct sunlight due to their inability to produce true black colors, reducing their contrast.Black LEDs maintain their color integrity and contrast even in bright conditions. The deep blacks create a stark difference against the colored pixels, making the content more readable.

3. Lower Brightness Required:Traditional LEDs often require higher brightness levels to improve visibility in sunlight, consuming more energy.With black LEDs, the need for excessive brightness is reduced, lowering energy consumption while maintaining visibility.

high contrast outdoor led display black led

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