Display Device Power Mesh Structure for Aperture Ratio and IR Drop
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Solution Overview
Problem
Recent large-area and high-integration display devices experience IR drop, leading to luminance non-uniformity due to variations in driving voltage applied to red, green, and blue subpixels, which results in a low aperture ratio and increased power supply lines.
Innovation Solution
A display device design with two power supply lines per pixel for red, green, and blue subpixels, incorporating a power mesh structure where power supply lines intersect to reduce IR drop and enhance the aperture ratio by using existing gate lines as additional power supply lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three separate power supply lines are provided for red, green, and blue subpixels, then luminance uniformity is maintained, but aperture ratio decreases due to increased power supply line occupation
Solution Approach 1:
The patent combines power supply functions by having multiple subpixels share common power supply lines. Specifically, first and second power supply lines are shared among multiple subpixels (red, green, and blue subpixels in different pixels), reducing the total number of power supply lines from three per pixel to two per pixel, thereby increasing aperture ratio while maintaining luminance uniformity through careful voltage compensation design
Solution Approach 2:
The power supply lines are designed to serve multiple functions and multiple subpixels simultaneously. The first power supply line supplies power to red subpixels across different pixels, the second power supply line supplies power to green subpixels, and the third power supply line supplies power to blue subpixels, creating a universal power distribution network that reduces line count while maintaining color-specific voltage control
2Reliability
If more power supply lines are provided to maintain uniform luminance, then voltage control is improved, but device complexity increases
Solution Approach 1:
The patent segments the power supply network into three distinct power supply lines (first, second, and third) that are distributed across multiple pixels. Each power supply line is responsible for specific color subpixels (red, green, blue respectively), creating a modular and manageable configuration that reduces complexity compared to providing three separate lines to every single pixel
Solution Approach 2:
The patent extends the power supply network across multiple pixels in a systematic pattern, using the spatial dimension to distribute power lines efficiently. By organizing power supply lines to serve multiple pixels along the horizontal direction, the design reduces the need for vertical power lines within each pixel, thereby simplifying the overall configuration
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 increases the aperture ratio and reduces voltage drop, improving luminance uniformity and power efficiency by optimizing the power supply configuration within the display device.
Implementation Method 1
Recent display devices with large area and high integration result in IR drop, and the IR drop causes luminance non-uniformity of the display devices
Data Source
AI summary
A display device comprises a substrate, a first pixel on the substrate, the first pixel comprising a first subpixel, a second subpixel, and a third subpixel, a second pixel on the substrate, the second pixel comprising a fourth subpixel, a fifth subpixel, and a sixth subpixel, first, second, third and fourth power supply lines extending in one direction and respectively coupled to the first, third, fifth, and sixth subpixels, and fifth and sixth power supply lines crossing the first, second, third, and fourth power supply lines and respectively coupled to the fourth and second subpixels.