Micro-LED Display Power Routing for Rounded-Corner Luminance Uniformity
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Solution Overview
Problem
Display panels experience luminance deviation due to power drops in the spline areas, which are defined in the corners of the display area, leading to inconsistent lighting performance.
Innovation Solution
The power lines in the display area are connected to dummy metal lines in the non-display area through connection lines in the spline area, effectively compensating for power drops and reducing luminance deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If power lines are extended into the spline area to supply power to light-emitting elements, then the display area can be increased with rounded corners, but power drops occur due to current and resistance leading to luminance deviation
Solution Approach 1:
The power supply path is segmented into two parts: the display area power lines and the non-display area dummy lines. By dividing the continuous power line into segments and routing dummy lines through the non-display area, the patent reduces the resistance and power drop in the spline area while maintaining the extended display area with rounded corners.
Solution Approach 2:
Dummy lines are introduced as intermediary conductors in the non-display area to provide alternative power supply paths. These dummy lines act as mediators that reduce the overall resistance and power drop by providing parallel conduction paths, thereby preventing luminance deviation in the spline area.
2Illumination intensity
If power lines are made thicker or shorter to reduce power drop, then luminance uniformity improves, but the display area with rounded corners cannot be achieved
Solution Approach 1:
The patent solves the power drop problem by transitioning from a two-dimensional planar layout to a three-dimensional multi-layer structure. Power lines and dummy lines are arranged in different layers, allowing the display area to be extended into the spline area with rounded corners while maintaining luminance uniformity through the multi-layer power distribution network.
Solution Approach 2:
The dummy lines in the non-display area serve multiple functions: they provide alternative power supply paths, reduce overall resistance, and enable the display area to be extended with rounded corners. This multi-functionality allows the system to achieve both luminance uniformity and extended display area simultaneously.
3Illumination intensity
If dummy lines are added in the non-display area to compensate for power drop, then luminance deviation is reduced, but device complexity increases
Solution Approach 1:
The dummy lines are merged with the existing power line structure and routing processes. By integrating the dummy lines into the standard manufacturing workflow and combining them with the power distribution network, the patent reduces the perceived complexity while achieving luminance uniformity through the combined power supply system.
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 prevents or reduces power drops in the spline area, thereby minimizing luminance deviations and improving the lifespan and power efficiency of the display device.
Implementation Method 1
the plurality of power lines and the plurality of dummy lines are connected to each other via a connection line in a spline area
Data Source
AI summary
Disclosed is a display device including a micro light-emitting element. The display device includes a substrate including a display area and a non-display area; a driving chip disposed on the substrate in the display area; a plurality of light-emitting elements disposed in an upper direction of the driving chip and electrically connected to the driving chip; a plurality of power lines disposed in the display area; and a plurality of dummy lines disposed in the non-display area, wherein the plurality of power lines and the plurality of dummy lines are connected to each other through a connection line in a spline area, wherein the spline area is defined in each corner of the display area, wherein a boundary line between the display area and the non-display area in the spline area has a curved shape.