What is HDR Technology: Local Dimming, Global Dimming

Table of Contents

Previously, we explained the LCD screen backlight layer. This article will explain the dimming technology used in the backlight layer and the closely related HDR technology.

1. What is HDR?

2. HDR Dimming Technology

The core of HDR technology lies in dimming technology, which can be categorized into two main types:

2.1 Global Dimming

ELED Backlight
ELED Backlight
Since the brightness adjustment affects the entire screen uniformly, it cannot differentiate between bright and dark areas simultaneously, resulting in a contrast ratio that is generally capped at around 1000:1.

2.2 Local Dimming

2.2.1 1D Local Dimming

1D local dimming
1D local dimming, reprinted from VESA
With 1D local dimming, displays can achieve a contrast ratio ranging from 6,000:

2.2.2 1.5D Local Dimming

1.5D local dimming
1.5 local dimming, reprinted from VESA
1.

2.2.3 Full Array Local Dimming (2D Local Dimming)

2D local dimming
As a result, FALD can achieve very high contrast ratios, ranging from 20,000:

Summary

apple pro display xdr
apple pro display xdr reprinted from apple.com
HDR technology has become a staple in modern display products, including smartphones, computer monitors, and televisions. Its ability to deliver vibrant, lifelike visuals makes it a key feature in many devices. As display technology evolves, high-end models now often incorporate Mini LED backlighting combined with Full Array Local Dimming (FALD) to further enhance HDR performance. These advanced setups bring unprecedented levels of brightness control and color precision, making them ideal for those who demand the best in visual quality. Additionally, more advanced iterations like XDR (Extreme Dynamic Range), popularized by products such as the Apple Pro Display XDR, have pushed the capabilities of HDR even further, offering an unparalleled viewing experience for users.
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