Mini LED Backlight Assembly With Exhaust Channels and Reflection Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current backlight division schemes for large-size liquid crystal displays suffer from low display contrast and high costs due to the use of printed circuit boards, necessitating a more efficient and cost-effective solution for backlight control.
Innovation Solution
A backlight assembly featuring a substrate with anode and cathode traces for mini LEDs, a planarization layer with via holes for connection pads, an auxiliary structure for gas exhaust, and a reflection layer for improved light extraction, all fabricated on a glass substrate to enhance display contrast and reduce thickness and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If PCB-based backlight division control is used for large-size display devices, then backlight control is achieved, but the display contrast is low and the structure is thicker
Solution Approach 1:
The patent replaces the traditional PCB-based mechanical backlight control system with a mini LED array directly mounted on a substrate. This substitution eliminates the need for thick PCB structures and enables precise local dimming control, thereby improving display contrast while reducing overall assembly thickness.
Solution Approach 2:
The backlight assembly is divided into multiple independently controllable mini LED regions. Each mini LED or group of mini LEDs can be controlled separately to achieve precise local dimming, which enhances display contrast by independently adjusting brightness in different display zones.
2Manufacturing precision
If mini LEDs are mounted on substrate with planarization layer, then precise backlight control is enabled, but gas accumulation occurs in the planarization layer causing display defects
Solution Approach 1:
The patent extracts the harmful gas accumulation problem by designing dedicated exhaust channels that extend from the planarization layer to the external environment. These channels provide a controlled pathway for gas to escape, preventing gas bubbles from forming in the display region and causing defects.
Solution Approach 2:
The exhaust channels act as intermediary structures between the planarization layer and the external environment. They mediate the gas release process by providing a controlled escape route, preventing direct gas accumulation in the display area while maintaining the integrity of the mini LED mounting structure.
3Ease of manufacture
If conventional backlight structure is used, then manufacturing is simpler, but light extraction efficiency is low
Solution Approach 1:
The patent introduces a reflection layer beneath the mini LEDs to redirect downward-emitted light upward toward the display. This dimensional change in light path management improves light extraction efficiency by utilizing the vertical dimension for light redirection, while the overall manufacturing process remains relatively simple through layer-by-layer fabrication.
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 proposed solution improves display contrast and light uniformity by effectively managing gas release and enhancing light extraction, resulting in a more efficient and cost-effective backlight assembly for large-size liquid crystal displays.
Implementation Method 1
an exhaust channel is further arranged on the planarization layer to release gas accumulated in the planarization layer
Implementation Method 2
featuring a reflection layer and passivation layers to enhance display uniformity and contrast
Data Source
AI summary
A backlight assembly, a manufacturing method thereof, and a display device are provided. The backlight assembly includes: a substrate, an anode trace and a cathode trace of an LED on the substrate, a planarization layer on a layer where the anode trace and the cathode trace of the LED are located, and an anode connection pad and a cathode connection pad on the planarization layer. The anode trace of the LED is coupled to the anode connection pad through a first via hole penetrating through the planarization layer, and the cathode trace of the LED is coupled to the cathode connection pad through a second via hole penetrating through the planarization layer. An exhaust channel is further arranged on the planarization layer to discharge gas accumulated in the planarization layer.