Mini-LED Backlight Module Branch Protection Circuit
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Solution Overview
Problem
In mini-LED backlight modules, LEDs connected in series are prone to burning or dimming due to overcurrent when short-circuited, affecting long-term reliability.
Innovation Solution
A protective circuit is deployed for each branch of LEDs, comprising a rectifier module and a control module that moderates the branch current by adjusting voltage and resistance in real-time to maintain current within a configured range, preventing damage from short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LEDs are connected in series in a single region for light emission, then brightness and display quality are improved, but reliability deteriorates due to overcurrent damage when LED short-circuits
Solution Approach 1:
The patent divides each backlight region into multiple independent branches, where each branch contains a series connection of LEDs. This segmentation ensures that when one LED short-circuits, only the affected branch is impacted while other branches continue to function normally, thus resolving the reliability issue while maintaining overall brightness
Solution Approach 2:
The patent implements a feedback control mechanism where the control module continuously monitors the voltage at the output end of each LED and adjusts the branch current through the rectifier module accordingly. This closed-loop feedback system maintains branch current within a configured safe range, preventing overcurrent damage and ensuring long-term reliability
2Reliability
If LEDs are connected in series to reduce current and prevent overcurrent damage, then reliability is improved, but brightness and display quality deteriorate
Solution Approach 1:
By segmenting each backlight region into multiple parallel branches with series-connected LEDs, the patent achieves both goals: series connection reduces current per LED string (improving reliability), while parallel branching maintains total light output (preserving brightness). Each branch independently contributes to the overall illumination
Solution Approach 2:
The patent employs dynamic current adjustment through the rectifier module controlled by the control module. The system dynamically moderates branch current based on real-time voltage feedback, allowing optimization of both reliability (by preventing overcurrent) and brightness (by maintaining appropriate current levels within safe ranges)
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 solution effectively prevents LED burning and dimming in separate backlight regions, ensuring reliable operation by maintaining branch currents within safe limits and minimizing the impact of short-circuited LEDs on other LEDs.
Implementation Method 1
a rectifier module, connected in series with the LED and configured to moderate a branch current of the LED
Implementation Method 2
configured to obtain a voltage of the output end of the LED and based on the voltage of the output end of the LED, to enable the rectifier module to moderate the branch current
Data Source
AI summary
The present application provides a mini light-emitting diode (mini-LED) backlight module and a display device. The mini-LED backlight module includes a plurality of separate backlight regions. Each of the separate backlight regions is provided with at least two LEDs. Each branch of the LEDs is connected to a protective circuit. The protective circuit includes a rectifier module connected in series with the LED, and a control module connected to the rectifier module and an output end of the LED.