Mini LED Driving Circuit Dynamic Voltage Adjustment
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Solution Overview
Problem
Mini LEDs driven through Active Matrix backlight methods face reactive power loss due to constant voltage supply, as the large number of driving chips limits voltage adjustment.
Innovation Solution
A driving circuit that includes a Tx chip and a power supply module, which adjusts the output voltage by obtaining and comparing wiring, light-emitting element string, and channel IR drops to generate an adjustment signal, ensuring the output voltage matches a target power supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If constant voltage is supplied to mini LEDs through AM driving method with multiple driving chips, then the driving capability is sufficient, but reactive power loss increases
Solution Approach 1:
The light-emitting assembly is divided into multiple light-emitting element strings connected in parallel, with each string containing multiple light-emitting elements connected in series. This segmentation allows independent voltage adjustment for each string, enabling optimized power distribution that reduces reactive power loss while maintaining sufficient driving capability.
Solution Approach 2:
The patent implements dynamic voltage adjustment by calculating target power supply voltages based on IR drops and voltage deviations of individual light-emitting element strings. The power supply module changes the output voltage parameter according to actual needs, transitioning from constant voltage to variable voltage supply, thereby reducing energy loss.
2Ease of operation
If multiple small-size driving chips are used to drive corresponding mini LEDs, then individual control is achieved, but voltage adjustment is limited by pin constraints
Solution Approach 1:
The power supply module serves multiple functions: it provides power to all light-emitting element strings simultaneously, adjusts voltage for each string based on calculated requirements, and compensates for IR drops in wiring and channels. This multi-functional approach replaces the need for multiple specialized driving chips, achieving both individual control and voltage adjustment capability.
Solution Approach 2:
The patent introduces an intermediary calculation and control mechanism that determines target voltages based on IR drop measurements and voltage deviations. This intermediary layer between the power supply and light-emitting elements enables precise voltage adjustment without requiring direct pin-level control from multiple driving chips.
3Reliability
If a plurality of light-emitting element strings are connected in parallel with multiple elements in series, then current distribution is improved, but voltage variations and IR drops increase
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors voltage deviations and IR drops of each light-emitting element string, calculates target power supply voltages based on this feedback, and adjusts the output voltage accordingly. This closed-loop control ensures voltage uniformity across all strings while maintaining improved current distribution.
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 reduces reactive power loss by dynamically adjusting the output voltage to match the target power supply voltage, enhancing power efficiency and HDR performance in mini LED light-emitting substrates.
Implementation Method 1
comparing the target power supply voltage with an output voltage supplied to the light-emitting assembly; generating an adjustment signal according to a comparison result of the output voltage and the target power supply voltage; and adjusting the output voltage according to the adjustment signal
Implementation Method 2
obtaining a wiring IR drop of the light-emitting substrate, a light-emitting element string IR drop of each of the plurality of light-emitting element strings
Data Source
AI summary
A method of controlling a driving circuit applicable to a light-emitting substrate which includes a light-emitting assembly including a plurality of light-emitting-element strings connected in parallel, each of the plurality of light-emitting strings comprising a plurality of light-emitting-elements connected in series, the driving circuit connected to the plurality of light-emitting-element strings via a wiring, wherein the method comprises: obtaining a wiring IR drop, a light-emitting element string IR drop, a voltage deviation, and a channel IR drop; obtaining a target power supply voltage according to the wiring IR drop, the light-emitting element string IR drop, the voltage deviation, and the channel IR drop; comparing the target power supply voltage with an output voltage to obtain a comparison result; generating an adjustment signal according to the comparison result; and adjusting the output voltage according to the adjustment signal. A driving circuit and a light-emitting substrate are further provided.