LED display comes in the era of HDR

HDR emerged in the broadcasting industry and gradually expanded to mobile devices. The introduction of this concept and technology in the field of LED display lags behind. Colorlight is the pioneer and earliest technology implementer of HDR technology in the LED display field, 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 in front of the display screen, humans have invented cameras, video cameras, televisions and other devices, and have also developed many advanced technologies. HDR is one of them. .

HDR stands for High-Dynamic Range, which means high dynamic range image technology. This technology was first applied to photography. Turning on HDR during the photo shoot process can make the original dark scene brighter and more transparent. Now, HDR technology has been applied to home appliances, smart terminals and other aspects. In the field of LED display, Colorlight has begun to truly experience the advantages of HDR technology.

What HDR can bring

Take the TV for example. The range of brightness that traditional TVs can exhibit is extremely limited, and it is far from the range that people can perceive. The reason for this is that the brightness of traditional TVs in the bright areas cannot be improved, and the darkness does not come down. This leads to poor perception of the level of the screen perceived by the human eye and loss of large amounts of detail.

HDR super quality display technology can perfectly solve this problem. Compared with the mainstream SDR 1080P display technology currently on the market, HDR has higher pixel loading: 3840×2160; wider color gamut range: BT2020. The same picture can display more color information, more details of the image lines. At the same time, with more advanced electro-optical conversion technology, all-round enhancement of the brightness and darkness of the picture, so that a picture in all directions to show the most realistic look.

In the LED display industry, Colorlight took the lead in making video processing equipment that supports the analysis of HDR chip sources, and promoted LED displays into the HDR era.

LED display comes in the era of HDR

HDR enhances the display effect compared to SDR

As you can see from the figure above, the HDR image on the right shows more highlight and shadow details. The human eye looks like the picture is fuller and the color transition is smoother.

Five dimensions of image quality improvement

As a leader in the image processing industry, SONY announced the standards for ultra-high-definition image quality, including five dimensions of improvement: resolution, color depth, color gamut, contrast and frame rate.

LED display comes in the era of HDR

The ultra-high-definition 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.

Here are the most difficult to understand color depth and color gamut:

HDR color depth

The Ultra HD Blu-ray standard specifies a color depth of 10 bits, which means that 1.07 billion colors can be displayed.

Each color in RGB has 2 to 10th power, which is 1024 levels. The RGB tri-color has a total of 1.07 billion (1024×1024×1024) colors.

The ordinary Blu-ray standard SDR support is 8bit color depth, only 16.77 million colors, the gap is wide. That is to say, through the 10bit output, the color is richer and fuller, and the gradation transition will be smoother than the 8bit.

HDR color gamut

Another concept corresponding to color depth is the color gamut. The former indicates the number of colors that can be displayed, and the latter indicates the range of colors that can be displayed.

Human eye, HDR, SDR color range comparison

Currently, the display color gamut covered by the consumer LCD/OLED screen is approximately BT.709, which is approximately equal to the 95% NTSC color gamut promoted by mobile phone manufacturers (72% NTSC=100% sRGB). In the past two years, many cell phones and laptop computers have begun to support the DCI-P3 color gamut, while the HDR color gamut standard is BT.2020.

The range of color reduction for BT.709 and BT.2020 is shown below. The BT.2020 color gamut of the HDR standard far exceeds the existing SDR color gamut and can display a richer range of colors, which plays a key role in the enhancement of the entire image in terms of color gradation and transition.

In the HDR standards that have now been released, the color depth and color space have been stipulated accordingly. The overall improvement of these parameters brings a "better pixel" display.

LED display comes in the era of HDR





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