Uniform Luminance LED Circuit via Segmented Conducting Lines
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Solution Overview
Problem
Conventional light-emitting element circuits for display devices face inefficiencies in local dimming due to varying resistance paths, leading to inconsistent luminance across light-emitting elements and increased design complexity and power consumption.
Innovation Solution
A circuit design featuring a smooth conducting line and a zigzag conducting line, where each light-emitting element's shortest path has a substantially identical resistance value, achieved through strategic connections and adjustments in path lengths and resistances, allowing for uniform luminance and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional conducting lines are used with different path lengths, then the circuit can be simple to design, but the resistance values of paths differ causing inconsistent luminance across light-emitting elements
Solution Approach 1:
The patent applies parameter changes by adjusting the resistance values of conducting lines through modifications in line width, line length, or material properties. Specifically, the conducting lines are designed with different resistance values to compensate for path length differences, ensuring that all light-emitting elements receive substantially equal current and thus exhibit consistent luminance across the display panel.
2Reliability
If multiple negative power terminals are used to achieve local dimming, then the contrast ratio can be improved, but the design complexity and power consumption of the external driving circuit increase
Solution Approach 1:
The patent applies segmentation by dividing the conducting lines into multiple segments with different resistance values. Each segment corresponds to a different light-emitting element or group of elements, allowing independent control of current distribution. This segmented approach enables local dimming functionality while maintaining a simplified driving circuit architecture, as the resistance variations are built into the conducting lines themselves rather than requiring complex external control.
3Manufacturing precision
If path lengths are made equal to reduce resistance differences, then luminance consistency improves, but the conducting line layout becomes more complex
Solution Approach 1:
Instead of making all path lengths equal, the patent changes the resistance parameter of the conducting lines by varying their widths, lengths, or materials. This allows different path lengths to result in equal resistance values, achieving luminance consistency without requiring a complex symmetric layout. The conducting lines can be routed in simple patterns while still achieving balanced current distribution through resistance matching.
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 solution ensures consistent luminance across light-emitting elements, reduces design complexity and power consumption, and facilitates thinner backlight modules by minimizing the number of zigzag conducting lines required.
Implementation Method 1
the conducting line itself has a specific resistance value, that is, R=ρ(L/A), wherein R is the resistance value of the conducting line, L is the length of the conducting line, A is the cross-sectional area of the conducting line, and ρ is the resistivity of the conducting line
Data Source
AI summary
A circuit of light-emitting elements connected between two power terminals is disclosed in the present disclosure. The circuit of light-emitting elements includes a smooth conducting line, multiple light-emitting elements, and a zigzag conducting line. The smooth conducting line is connected to one of the power terminals. One terminal of each light-emitting element is electrically connected at a different position of the smooth conducting line. The zigzag conducting line is connected to the other of the power terminals, and the other terminal of each light-emitting element is electrically connected at a different position of the zigzag conducting line. Each shortest path, starting from one of the power terminals, passing through any the light-emitting element along the smooth conducting line, and ending at the other of the power terminals along the zigzag conducting line, has substantially a same resistance value.