Display Device Non-Rectangular Scan Drive Circuit Layout
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Solution Overview
Problem
Display devices with non-rectangular scan drive circuits, particularly those using oxide semiconductor transistors, tend to exhibit horizontal lines in the image due to differing layouts of unit circuits, which affects image quality.
Innovation Solution
A display device design that includes a substrate with a display region and a picture-frame region featuring a first and second unit circuit block with non-parallel orientations, utilizing trunk wires for clock and constant voltage signals, and dummy elements with overlapping oxide semiconductor layers to minimize layout variations and prevent horizontal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a non-rectangular scan drive circuit is used to increase the display region size, then the display region area is improved, but horizontal lines appear in the displayed image due to layout variations in unit circuits
Solution Approach 1:
The patent applies asymmetry by intentionally introducing dummy elements that create deliberate asymmetric layout variations to counterbalance the asymmetric layout variations caused by the non-rectangular scan drive circuit configuration. This compensates for the uneven distribution of oxide semiconductor layers across different unit circuits, preventing the formation of horizontal lines while maintaining the expanded display region.
Solution Approach 2:
The patent changes the layout parameters of unit circuits by adding dummy elements with varying configurations (different numbers, positions, and arrangements) to adjust the overall layout distribution. This parameter adjustment ensures that the oxide semiconductor layers are more uniformly distributed across all unit circuits, eliminating the horizontal line defect while preserving the non-rectangular circuit layout that enables larger display area.
2Area of stationary object
If unit circuits are arranged in different directions to form a non-rectangular scan drive circuit, then the display region can be enlarged, but the layout uniformity of oxide semiconductor layers deteriorates causing image defects
Solution Approach 1:
The patent applies local quality by configuring dummy elements with different characteristics in different local regions of the scan drive circuit. Each unit circuit receives dummy elements tailored to its specific position and orientation, creating local compensations that collectively achieve uniform oxide semiconductor layer distribution across the entire non-rectangular circuit structure.
Solution Approach 2:
The patent employs preliminary action by pre-calculating and pre-positioning dummy elements during the circuit design phase to compensate for anticipated layout variations. This advance preparation ensures that oxide semiconductor layers are uniformly distributed before the actual manufacturing process, preventing horizontal line formation in the final display.
3Object-affected harmful factors
If dummy elements are added to unit circuits to compensate for layout variations, then horizontal lines are prevented, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the dummy element configuration into discrete, modular units that can be independently added to each unit circuit. This segmentation allows for systematic management of the additional elements, organizing them in a structured manner that minimizes the impact on overall device complexity while effectively preventing horizontal lines.
Data Source
AI summary
A display device includes: a display region; and a picture-frame region provided outside the display region. A trunk wire forming region is provided between a first unit circuit block and a second unit circuit block in the picture-frame region. The trunk wire forming region includes: a first gate-clock-signal trunk wire; a second gate-clock-signal trunk wire; a first constant-voltage trunk wire; a second constant-voltage trunk wire; and a control-signal trunk wire. The trunk wire forming region is provided with: a set signal line; and a dummy element.