#dci-p3

[technewsrooms28]

9. Color Gamut (Display Learn)

The color gamut is another name for the color reproduction range or color spectrum about display technology. It provides measurable data on the spectrum of real colors that a screen can replicate. It so shows the spectrum of colors that may be shown on a display. Generally speaking, color standards like sRGB, Adobe RGB, and DCI-P3 that are shown on the CIE chromaticity diagram are used to express…

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[axiang1980]

Redmi Note 11 Pro+ 5G 將於 4/18 開賣，中階定位卻擁有 120W 快充、120Hz 高刷螢幕與億級畫素鏡頭！

Redmi Note 11 Pro+ 5G 將於 4/18 開賣，中階定位卻擁有 120W 快充、120Hz 高刷螢幕與億級畫素鏡頭！

Redmi 於今（4/14）日宣布推出 Redmi Note 11 系列中的頂規機款「Redmi Note 11 Pro+ 5G」，除了延續億級像素鏡頭、120Hz AMOLED 螢幕的絕佳規格，搭載 MediaTek Dimensity 920 5G 處理器，更首度將旗艦機才配備的 120W HyperCharge 極速快充功能帶入 Redmi 品牌，並加入 LiquidCool 水冷技術、JBL 專業調音等頂級技術，以同級品牌無法比擬的規格再創中階旗艦市場巔峰。   (more…)

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[axiang1980]

1 億像素感光元件普及化？性價比之王 Redmi Note 11S 打造「億像素全民機」，千元價位直攻旗艦級規格！

  小米旗下子品牌 Redmi 堅持以親民價格打造旗艦級規格的產品，其中 Redmi Note 全球累計銷量已突破 2.4 億台，無疑成為全球中高階價格帶中最獲消費者喜愛的系列之一。繼去年以不到七千元的價格推出 6400 萬像素影像挑戰者「Redmi Note 10S」，以絕佳的相機規格及性能撼動中階市場，Redmi 再一次將高像素體驗推向普及化，於今（2/22）日宣布在台灣市場推出新一代 1 億像素性價比之王—「Redmi Note 11S」，在同樣價格中，配備旗艦級 1 億像素 AI 四鏡頭相機、6.43 吋 90Hz AMOLED 流暢螢幕，以及高效的  MediaTek Helio G96 處理器搭配 33W Pro 快速充電，在各方面都為用戶提供高品質體驗，將相機、螢幕、續航及快充等功能都升級不加價，再度重新定義中階機款的標準。   (more…)

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[axiang1980]

平價也有優異規格！POCO M4 Pro 5G 正式發表，價格新台幣 5,999 元起，三色款皆活力十足！

平價也有優異規格！POCO M4 Pro 5G 正式發表，價格新台幣 5,999 元起，三色款皆活力十足！

POCO 今年一月首度以獨立品牌之姿在台發佈 POCO M3，之後陸續發佈高階旗艦殺手 F 系列、中階性能怪獸 X 系列及入門潮玩遊戲 M 系列等機款，持續完備各價位帶的產品線，以不同規格的出色機款滿足用戶的全方位需求，展現深耕台灣市場的決心。POCO不斷升級，於今（12/20）日宣布再推出平價 5G 機款 POCO M4 Pro 5G，持續以超越同級品牌的規格搶佔用戶心佔率，直升入門級 5G 購機首選！   (more…)

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[axiang1980]

小米推出新影音旗艦 Xiaomi 11T，億級像素 AI 三鏡頭打造 CINEMAGIC 影院級攝影功能，120W 極速快充技術更是台灣首見！

小米推出新影音旗艦 Xiaomi 11T，億級像素 AI 三鏡頭打造 CINEMAGIC 影院級攝影功能，120W 極速快充技術更是台灣首見！

  小米台灣 10/27 宣布推出攝影旗艦的最新鉅獻 – Xiaomi 11T Pro 5G、Xiaomi 11T 5G，不僅以媲美專業相機硬體結合創意電影模式，同時配備影院級視聽規格，讓 Xiaomi 11T 系列化身掌上電影院，更搭載劃時代的極速快充技術，Xiaomi 11T Pro 5G 更成為台灣市場中首款在 110V 中最高支援 120W 極速快充的手機，最快充電 17 分鐘即滿電，以強大效能與電影級攝影，讓精彩生活隨時上映。   (more…)

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[axiang1980]

華為在台推出 HUAWEI MatePad 11 平板、9/24 正式上市！搭載 Harmony OS2、120Hz 更新率全面屏、可搭配 M-Pencil 手寫筆生產力更提升！

華為在台推出 HUAWEI MatePad 11 平板、9/24 正式上市！搭載 Harmony OS2、120Hz 更新率全面屏、可搭配 M-Pencil 手寫筆生產力更提升！

  HUAWEI 推出平板新品 HUAWEI MatePad 11，採用 120Hz 更新率全面屏及 DCI-P3 廣色域，流暢出色的螢幕體驗更優化，搭配新一代具隱身觸控 M-Pencil 手寫筆，使用者可輕鬆切換功能並盡情釋放靈感。   Continue reading

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[appliancesreviews]

HDR technology

High Dynamic Range provides better contrast, greater brightness levels and a wider colour palette compared to traditional technology. According to many experts, HDR technology was the first significant leap after the advent of HDTV instead of SD. The development and implementation of this technology has become a logical continuation of the rapid development of television technology. Strong competition and the development of digital technologies have stimulated the technical development of TVs. As a consequence, companies created new matrix generation, including OLED, the high-performance video processors and new technologies, including FALD backlighting. These new TVs processed video signals at a fundamentally new level, providing a revolutionary improvement in image quality. But, unfortunately, the traditional standards of 8-bit color limited new possibilities. Of course, this situation could not last long. As a result, in 2012, Dolby Labs offered an elegant solution to this problem, increasing the dynamic range of the image brightness to 12 bits. As known, this value directly affects the number of displayed colors and their shades.

Of course, increasing the number of bits significantly expands the color gamut.

Accordingly, Dolby Vision became the first format for HDR. But this situation did not suit many market leaders and they began to develop their own alternative standards. Of course, such a development was unlikely to have prospects due to the complete absence of unification. Therefore, LG, Samsung, Sharp, Sony and Vizio have joined forces and created an open source HDR standard. In April 2016, the UHD Alliance industry group, including LG, Samsung, Sony, Panasonic, Dolby, etc announced the adoption of Ultra HD Premium certification for UHD Blu-ray players.

Operation principle

The scheme perfectly illustrates the essence of this technology, which uses the expansion of the color palette to increase the image saturation.

Of course, the image quality in this format is radically superior to the traditional format.

The image quality mainly depends on the contrast (the ratio of the brightest and darkest points on the screen) and color rendering (color palette, color gamut). Of course, the matrix resolution, viewing angles, fps of video, sound quality, refresh rate, etc also affect the perception of video content. But, the realism of perception mainly depends on the contrast, which creates a sense of depth and clarity, and color gamut, which provides color saturation. As known, the contrast characterizes the ratio of peak brightness to black level (minimum brightness), which are measured in ‘nits’ (1 nit corresponds to candle brightness). For example, TV with a maximum brightness of 400 nits and a black level of 0.4 nits provides contrast of 400 nit / 0.4 nit = 1000: 1. Of course, today OLED matrices provide maximum contrast due to the lack of backlight and, accordingly, almost "0" black level. This value significantly affects the visualization of content.

Budget TVs usually provide up to 500: 1. The contrast of expensive models reaches 1000: 1 and higher. As known, 10-bit color reproduces more than a billion shades. Of course, such a wide range almost completely erases the gradations between shades, increasing the realism of the scene. Modern HDR technology uses 10-bit HDR10 standard and its versions with DCI-P3 or 12-bit Dolby Vision with Rec.2020.

HDR content and its broadcast

Any video content contains static metadata, which is necessary for adjusting the screen when mastering during signal processing. They do not change and are therefore called static. But static metadata does not preserve the original colors for each scene. Dynamic metadata solves this problem.

In fact, content creators set the necessary brightness and contrast for each frame. They then generate a set of metadata and merge them with content for frame-by-frame transmission. Thus, each frame has its own metadata. This unique technology provides the most accurate color rendition. Of course, the creation of such video content is very expensive, and its broadcast requires a very high bandwidth communication channel. New HDR10+ provides the transfer of dynamic metadata, reducing differences in color accuracy compared to the Dolby Vision standard.

Matrix

Today, the AV industry uses OLED and LED LCD displays. For more than a decade, experts have been discussing their advantages and disadvantages in "OLED vs LED LCD" mode. As known, OLED matrix uses their own diode radiation without additional LED backlight. As a result, OLED TVs have minimal thickness, excellent viewing angles and provide almost “0” black. However, they are expensive and have limitations in peak brightness. LED LCDs are much cheaper, provide high peak brightness, and FALD backlight effectively reduces the black level due to the local dimming of individual screen segments. Since almost all modern TVs provide high image quality due to additional efficient technologies, the thickness and price significantly affect the final consumer choice.

On the other hand, LG has advanced significantly in the development of OLED technology, introducing several relatively inexpensive 4K OLED models in 2018, including LG OLED B8 PLA. Of course, this trend can significantly reduce price differences. Thus, OLED and LED LCD displays provide high contrast, but the OLED matrix forms it due to the minimum black level, and the LED LCD screen provides it with high peak brightness. The UHD Alliance elegantly solved this problem with two standards, each of which corresponds to a UHD Premium: - peak brightness more than 1000 nits and black level less than 0.05 nits; - brightness over 540 nits and black level less than 0.0005 nits. Thus, LED LCD TVs can qualify for Ultra HD Premium status in accordance with the first standard, and OLED models can use the second standard.

Conclusion

In general, modern LED LCD TVs provide a high peak brightness with a traditional black level, and OLED TVs reproduce a less bright picture with a deeper black. The difference in perception mainly depends on the content and personal preferences of the viewer. Technology roadmap for UHD will help you navigate the current situation in this segment.

Of course, today support for HDR is one of the important criteria for choosing a TV. This video offers a comparison of SDR vs ４K HDR (HLG) image quality. Read the full article