Backlight Source Local Dimming via Adapter Plate Circuit Topology
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Solution Overview
Problem
Existing direct-type backlight modules face challenges in achieving effective local dimming while minimizing costs, as the partitioning of LEDs on a PCB leads to wasted space and increased costs due to the need for a large area for LEDs, and the number of LEDs in dimming regions affects both cost and dimming effectiveness.
Innovation Solution
The proposed solution involves a backlight source comprising multiple light bars with integrated adapter plates and connection structures, allowing for flexible control of light-emitting groups in series to form dimming regions, reducing the number of LEDs required and optimizing the layout to minimize costs and enhance dimming efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs are evenly arranged on a back of a panel in a direct-type backlight module, then backlight may be evenly transmitted to an entire screen, but local dimming effectiveness deteriorates
Solution Approach 1:
The backlight module partitions LEDs into multiple independent dimming zones, where each zone can be controlled separately. This segmentation allows different regions to have different brightness levels, enabling local dimming while maintaining overall backlight uniformity through the even distribution of LEDs across the panel.
Solution Approach 2:
The backlight module implements dynamic brightness control for different dimming zones based on display content requirements. The controller can adjust the brightness of each zone independently in real-time, allowing the system to adapt to different viewing conditions and content types while preserving the even LED arrangement.
2Loss of energy
If the backlight source is divided into a plurality of small regions for local dimming, then energy saving and contrast improvement are achieved, but the number of LEDs required increases cost
Solution Approach 1:
The patent applies local quality by creating dimming zones with different brightness characteristics in specific regions of the backlight module. Each zone can be optimized for its specific function (e.g., higher brightness in viewing areas, lower in borders), reducing overall energy consumption while using the same LED density and avoiding additional manufacturing costs.
Solution Approach 2:
The same LED array serves multiple functions: it provides uniform backlight illumination across the entire panel while simultaneously enabling local dimming control through zone-based addressing. This multi-functionality eliminates the need for separate LED sets for different zones, reducing component count and manufacturing cost while achieving both energy saving and contrast improvement.
3Adaptability or versatility
If more LEDs are used in dimming regions, then dimming effectiveness improves, but manufacturing cost increases
Solution Approach 1:
The patent changes the control parameter from individual LED control to zone-based control, where groups of LEDs are controlled together. This allows effective local dimming to be achieved by controlling the brightness of entire zones rather than requiring precise control of each individual LED, reducing the complexity and cost associated with high-precision LED control while maintaining dimming effectiveness.
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
This configuration reduces manufacturing costs and improves the local dimming effect by allowing flexible control over the shape and size of dimming regions, while also reducing the thickness and bezel size of the display apparatus.
Implementation Method 1
Each light bar includes at least one light-emitting group, each light-emitting group including at least two light-emitting devices connected in series
Data Source
AI summary
A backlight source includes light bars, adapter plate(s) and connection structures. Each light bar includes light-emitting group(s) and external connection unit(s). Each external connection unit is electrically connected to at least one light-emitting group and included at least one first electrode pair. Each adapter plate includes adapter circuits, each adapter circuit includes adapter units, each adapter unit includes at least one second electrode pair. Ends of each connection structure are electrically connected to one external connection unit and one adapter unit. All second electrode pairs of adapter units of a same adapter circuit are classified into at least one group, each group includes second electrode pairs electrically connected in series. In light-emitting groups electrically connected to adapter units of the same adapter circuit, light-emitting groups electrically connected second electrode pairs in a same group are connected in series to form a dimming region.