Display Panel Driver Layout for Four-Sided Frameless Bezels
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Solution Overview
Problem
Existing display devices face challenges in achieving a frameless design due to the need for separate data and gate drivers, which occupy significant non-display areas, limiting the reduction of bezel size.
Innovation Solution
A display device is designed with a display driver that functions as both a data driver and a gate driver, minimizing the non-display area by reducing the distance between the pad portion and the display area through innovative connection line configurations, including dummy scan lines and multiple metal layers for connection lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate data driver and gate driver are used, then driving functionality is ensured, but non-display area increases
Solution Approach 1:
The patent combines the data driver and gate driver into a single integrated driver located in one corner of the display device. This merging of previously separate driver functions into one unified component significantly reduces the non-display area occupied by driver circuits, enabling the four-sided frameless design while maintaining complete driving functionality for both data and gate signals.
Solution Approach 2:
The integrated driver performs multiple functions - serving as both a data driver and a gate driver. This multi-functional design allows a single component to replace what would traditionally require two separate components, thereby reducing the overall area required for driver circuits and enabling minimal bezel design.
2Reliability
If pad portion is positioned far from display area, then connection is stable, but bezel size increases
Solution Approach 1:
The patent utilizes multiple metal layers to create three-dimensional wiring paths for connection lines. By transitioning from a two-dimensional planar connection to a multi-layered three-dimensional structure, the connection lines can extend vertically through different metal layers, allowing the pad portion to be positioned closer to the display area while maintaining stable electrical connections through the layered structure.
Solution Approach 2:
The connection lines are embedded within multiple nested metal layers, with each layer providing additional connection pathways. This nested structure allows connection lines to be routed through intermediate metal layers, enabling shorter horizontal distances between pad and display area while maintaining connection integrity through the layered nesting approach.
3Length of stationary object
If connection lines are routed through multiple metal layers, then distance between pad and display area is reduced, but manufacturing complexity increases
Solution Approach 1:
The connection path is segmented across multiple metal layers, with each layer handling a portion of the connection route. This segmentation allows the overall connection to be achieved through simpler, more manageable individual layers rather than requiring complex long-distance routing in a single layer, thereby reducing manufacturing complexity while achieving shorter effective distance.
Solution Approach 2:
Intermediate metal layers serve as mediators for signal transmission between the pad portion and display area. These intermediary layers provide convenient connection points and routing paths, simplifying the overall connection architecture by breaking down the direct long-distance connection into shorter segments mediated by intermediate conductive layers.
Data Source
AI summary
A display device includes a display panel including a display area having pixels, and a non-display area surrounding the display area, and having a pad portion at one side, the display area including a first sub-display area overlapping the pad portion in a second direction, and a second sub-display area at one side of the first sub-display area, and including a data line, the first sub-display area including a data line, a first gate line on one side of some of the pixels, a first connection line located on one side of others of the pixels, and a second connection line connected to the first connection line, and extending to the second sub-display area in a first direction crossing the second direction, and wherein the data line is electrically connected to the pad portion through the first connection line and the second connection line.