Display Scan Line Layout for Lower IR Drop and Luminance Deviation
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Solution Overview
Problem
Existing display devices with single side driving structures face challenges in reducing IR drop of scan signals and power voltage, leading to increased power consumption and luminance deviations.
Innovation Solution
The display device incorporates a bottom metal layer with patterned residual areas, featuring supplementary power lines connected to power lines, and a method of fabricating the device using multiple exposure operations to minimize stitch spots and reduce unnecessary metal line lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single side driving structure is used, then device complexity is reduced, but IR drop of scan signals increases
Solution Approach 1:
The scan driver is divided into multiple sub-scan drivers that drive different groups of sub-scan lines. Each sub-scan driver is positioned at different locations along the pixel array, segmenting the single driving side into multiple distributed driving points. This reduces the length of individual sub-scan lines and mitigates IR drop while maintaining the overall single side driving architecture.
Solution Approach 2:
The patent introduces a spatial dimension by distributing sub-scan drivers along the length of the pixel array rather than concentrating them at a single location. This transforms the single point driving approach into a distributed linear arrangement, reducing the maximum distance scan signals must travel and thereby reducing IR drop.
2Device complexity
If single side driving structure is used, then device complexity is reduced, but power consumption increases
Solution Approach 1:
By segmenting the scan driver into multiple sub-scan drivers positioned at different locations, the patent reduces the total length of sub-scan lines required. Shorter lines have lower resistance and capacitance, reducing the energy required to drive each line and thereby decreasing overall power consumption while maintaining structural simplicity.
3Device complexity
If single side driving structure is used, then device complexity is reduced, but luminance deviations increase
Solution Approach 1:
The segmentation of scan drivers into multiple distributed units ensures that scan signals reach different regions of the pixel array with more uniform timing and voltage levels. This reduces variations in pixel activation across the display, minimizing luminance deviations and improving overall luminance uniformity.
Solution Approach 2:
By distributing drivers along the pixel array in a linear arrangement, the patent creates a more uniform signal distribution pattern across the display surface. This spatial distribution reduces the variation in signal strength and timing that would otherwise cause luminance deviations, improving manufacturing precision in terms of luminance uniformity.
4Manufacturing precision
If multiple exposure operations are performed, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The bottom metal layer pattern is divided into multiple exposure areas that are processed in sequence. Each exposure area is optimized for specific features, allowing precise patterning of complex structures like sub-scan lines and power lines. The segmentation enables high manufacturing precision while the systematic approach minimizes the total number of exposure steps required.
Data Source
AI summary
A display device includes a pixel component including scan lines, data lines, and pixels electrically connected to the scan lines and the data lines, and defining pixel columns and pixel rows, a data driver disposed on a side of the pixel component, and a scan driver disposed on the side of the pixel component. The pixel component includes sub-scan lines, and dummy lines. Each scan line may be electrically connected to the sub-scan lines by contacts. The contacts are divided into contact groups having a same arrangement. The pixel component is divided into pixel blocks corresponding to the contact groups. Each pixel block includes first and second area divided by contact group. The first area is closer to the scan driver than the second area. The pixel component further includes supplementary power lines spaced apart from the respective sub-scan lines.