Display Device Driving Voltage Line Mesh Structure
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Solution Overview
Problem
Display devices face challenges in achieving high integration while preventing voltage drops in driving voltage, due to increased complexity and wiring density.
Innovation Solution
The display device incorporates a mesh structure for driving voltage lines, with horizontal and vertical driving voltage lines integrated over the same layer, and a connection line arranged over a different layer, allowing for efficient voltage distribution and reduced wiring complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of TFTs and wirings is increased to precisely control light emission, then control precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the driving voltage line with the second electrode of the storage capacitor, forming an integral structure. This combination reduces the number of separate wiring elements while maintaining the necessary control functions, thereby addressing the contradiction between control precision and device complexity
Solution Approach 2:
The second electrode of the storage capacitor serves dual functions: as part of the storage capacitor structure and as the driving voltage line. This multi-functionality reduces the overall wiring complexity while maintaining precise control capabilities
2Productivity
If wiring density is increased to achieve high integration, then productivity is improved, but voltage drop increases
Solution Approach 1:
The driving voltage line is segmented into horizontal and vertical portions that extend from the storage capacitor in different directions. This segmentation allows the voltage line to reach multiple pixels efficiently, improving integration density while maintaining adequate voltage distribution through the distributed structure
Solution Approach 2:
The driving voltage line extends in multiple directions (horizontal and vertical) from the storage capacitor, transitioning from a single-directional connection to a multi-dimensional distribution network. This dimensional expansion enables efficient voltage distribution across densely integrated pixels
3Productivity
If the driving voltage line is extended to cover more pixels, then productivity is improved, but voltage drop increases
Solution Approach 1:
The driving voltage line is divided into multiple segments extending in different directions from the storage capacitor. This segmentation allows the voltage to be distributed to multiple pixels through shorter individual path lengths, reducing cumulative voltage drop while expanding coverage area
Solution Approach 2:
The voltage distribution network transitions from linear extension to multi-directional radial distribution, allowing the driving voltage line to cover a larger area with shorter effective path lengths in each direction, thereby reducing voltage drop
Data Source
AI summary
A display device includes a plurality of pixels, wherein a first pixel of the plurality of pixels includes: a scan line extending in a first direction; a data line extending in a second direction intersecting the first direction; a switching thin film transistor (TFT) connected to the scan line and the data line; a driving TFT connected to the switching TFT and comprising a driving gate electrode; a storage capacitor comprising the driving gate electrode as a first electrode and a second electrode arranged above the first electrode and overlapping the first electrode; a horizontal driving voltage line extending from the second electrode in the first direction; and a vertical driving voltage line extending from the second electrode in the second direction, wherein the horizontal driving voltage line, the vertical driving voltage line, and the data line are arranged over a same layer.