Backlight Module Voltage Drop Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mini LED backlights experience uneven brightness due to voltage drops across signal lines, leading to non-uniform display brightness.
Innovation Solution
The backlight module design includes parallel data lines with evenly spaced nodes and equal resistance values, ensuring consistent current direction and voltage across light-emitting diode units, which compensates for voltage drops and maintains uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional data line configuration is used, then device complexity is low, but brightness uniformity deteriorates due to voltage drops
Solution Approach 1:
The patent divides the data lines into multiple segments by introducing intermediate nodes (first nodes and second nodes) along the data line paths. These nodes are connected to adjacent LED units, creating segmented voltage distribution points that reduce the impact of voltage drops across long data lines and improve brightness uniformity.
Solution Approach 2:
The patent introduces intermediate nodes as mediators between the data line terminals and the LED units. These intermediate nodes act as voltage buffer points that compensate for voltage drops in the data lines, ensuring more uniform voltage distribution across all LED units and thereby improving brightness uniformity.
2Illumination intensity
If data line resistance is reduced, then voltage drop is minimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different resistance values to different segments of the data lines based on local requirements. By calculating and assigning specific resistance values to each segment (Rd1, Rd2, Rd3, Rd4) and (Rs1, Rs2, Rs3, Rs4), the design optimizes voltage distribution locally at each LED unit while maintaining overall brightness uniformity.
Solution Approach 2:
The patent changes the resistance parameters of the data line segments by introducing intermediate nodes with specific resistance values. This parameter modification allows the system to compensate for voltage drops without requiring extremely low resistance throughout the entire data line, thereby reducing the stringency of manufacturing precision requirements.
3Illumination intensity
If more intermediate nodes are added, then voltage distribution is improved, but device complexity increases
Solution Approach 1:
The patent introduces intermediate nodes at specific strategic positions rather than uniformly throughout the entire data line. By placing nodes at calculated positions that provide sufficient voltage compensation, the design achieves improved brightness uniformity without the excessive complexity of uniform node distribution throughout the entire data line path.
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 design reduces the maximum voltage drop to one-sixth of previous designs, improving overall brightness and uniformity of the light-emitting diode group.
Implementation Method 1
The light-emitting diode group includes at least two light-emitting diode units
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes a first data line, a second data line, and a light-emitting diode group. The light-emitting diode group includes two or more light-emitting diode units. A voltage at a connection point between a n-th light-emitting diode unit and the first data line is defined as Vn. A voltage at a connection point between the n-th light-emitting diode unit and the second data line is defined as Un. In response to Vi is greater than Vj, Ui is greater than Uj.