Mini LED Backlight Layout for HDR Displays Without Hotspots
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Solution Overview
Problem
Existing liquid crystal displays face challenges in achieving high contrast and high dynamic range (HDR) due to the limitations of traditional backlight sources, which are not adequately matched with the grayscale presentation of the display panel.
Innovation Solution
The use of mini LEDs or micro LEDs as backlight sources, arranged in a specific configuration on a light-emission board with controlled brightness, combined with a light diffusion structure and protective layers, to enhance the display's HDR capabilities while minimizing hotspot phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the size of LED serving as backlight source is reduced to improve display properties, then pixels per inch and resolution are improved, but the distance between light-emission units increases leading to hotspot phenomena
Solution Approach 1:
A light diffusion structure is introduced as an intermediary component between the mini LED backlight source and the display panel. This diffusion structure scatters the light from each mini LED unit, preventing direct visualization of individual light sources and eliminating hotspot phenomena while maintaining the benefits of small-sized LEDs for high resolution displays
Solution Approach 2:
The patent applies different structural characteristics to different regions: mini LEDs with maximum size not greater than 3mm are used in the central display region for high resolution, while the light diffusion structure uniformly distributes light across the entire display area, creating locally optimized light emission characteristics that prevent hotspots
2Manufacturing precision
If mini LEDs are arranged closer together to improve resolution, then pixels per inch is improved, but the distance between adjacent light-emission units decreases requiring larger separation distance to avoid hotspots
Solution Approach 1:
The light diffusion structure serves as a mediator that allows mini LEDs to be arranged at smaller center-to-center distances without causing hotspots. The diffusion structure scatters light over a wider area, effectively decoupling the physical spacing of LEDs from the perceived light distribution pattern, thereby enabling higher PPI while maintaining uniform illumination
3Object-generated harmful factors
If the distance between display panel and light-emission board is increased to reduce hotspots, then hotspot phenomena are reduced, but the thickness of display device increases
Solution Approach 1:
The light diffusion structure is positioned between the mini LED board and the display panel at an optimized distance. This intermediary component actively manages light distribution, allowing the system to maintain a compact overall thickness while still achieving uniform light distribution and eliminating hotspots through optical diffusion rather than relying solely on increased physical separation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a high dynamic range effect with reduced thickness and improved display performance by optimizing the arrangement and brightness control of mini LEDs, ensuring uniform light distribution and reducing hotspots.
Implementation Method 1
a light diffusion structure located between the light-emission board and the display panel
Data Source
AI summary
A display device includes a display panel and a light-emission board which includes a base substrate and light-emission units, and a maximum size of the light-emission unit in a direction parallel to the base substrate is not greater than 3 mm; connecting lines of centers of four immediately adjacent light-emission units define a quadrangle; a connecting line of centers of two light-emission units that define the quadrangle and have a largest distance therebetween passes through two first points in edges, close to each other, of the two light-emission units; a distance between the two first points is a first distance D1; an included angle between an outermost light ray of light rays emitted by the light-emission unit and a plane parallel to the base substrate is θ; and a minimum distance between surfaces, close to each other, of the display panel and the base substrate is not less than D1*tan θ/2.