Single-Side Display Scan Layout for Lower IR Drop
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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 with multiple exposure operations to minimize stitch spots.
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 sub-scan lines. Each sub-scan line is independently controlled, allowing the scan driver to be distributed across different locations rather than requiring a single centralized driver. This segmentation reduces the current path length for each sub-scan line, thereby reducing IR drop while maintaining the single side driving structure.
Solution Approach 2:
The patent introduces supplementary power lines that extend in the second direction (vertical direction) to provide power to the sub-scan lines. By adding this vertical dimension to the power distribution network, the patent reduces the horizontal current path length and provides additional power supply paths, thereby mitigating IR drop without increasing the complexity of the single side driving structure.
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 and dividing the scan lines into multiple sub-scan lines, the patent reduces the total current that each driver must supply. This segmentation allows for more efficient power distribution and reduces overall power consumption while maintaining the simple single side driving structure.
Solution Approach 2:
The supplementary power lines extending in the vertical direction provide additional power supply paths, reducing the burden on the horizontal power lines. This three-dimensional power distribution network reduces power consumption by providing multiple routes for current flow and reducing resistive losses.
3Device complexity
If single side driving structure is used, then device complexity is reduced, but luminance deviations increase
Solution Approach 1:
By dividing the display into multiple pixel blocks with corresponding sub-scan lines, the patent ensures that each block receives adequate drive strength. This segmentation prevents luminance deviations by ensuring uniform current distribution across different regions of the display, while the single side driving structure maintains simplicity.
Solution Approach 2:
The supplementary power lines extending in the vertical direction provide additional power supply to different regions of the display, ensuring uniform voltage distribution. This three-dimensional power network compensates for voltage drops and reduces luminance deviations across the display area without increasing driving structure complexity.
4Manufacturing precision
If multiple exposure operations are performed, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent performs multiple exposure operations with overlap areas, where each exposure operation is carefully planned and executed in sequence. The overlap areas ensure proper alignment between different pattern layers, achieving high manufacturing precision. By preparing and executing each exposure step with preliminary planning, the patent maintains precision while managing the impact on productivity.
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.