Display Substrate Circuit Layout for Narrow Rounded-Corner Bezels
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Solution Overview
Problem
Existing display technologies using Low Temperature Polycrystalline Oxide (LTPO) technology face challenges in achieving a narrow bezel due to the addition of drive circuits for metal oxide transistors, which complicates the design and increases the bezel width.
Innovation Solution
The display substrate design includes a circuit structure layer with intersecting and partially overlapped reset output and transfer lines, control output and connection lines, and light emitting output and connection lines in different layers, reducing the area occupied by rounded corners and allowing for a narrower bezel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional drive circuits are added to control metal oxide transistors in LTPO technology, then display functionality is improved, but production cost and power consumption increase
Solution Approach 1:
The patent combines multiple functions into the control drive circuit located in the rounded corner region. This circuit simultaneously controls reset transistors, writing transistors, and light emitting transistors, eliminating the need for separate drive circuits and reducing overall power consumption while maintaining full display functionality
Solution Approach 2:
The control drive circuit is designed as a multi-functional unit that can provide drive signals to different types of transistors (reset, writing, and light emitting). This universal circuit reduces the total number of components needed and lowers power consumption by consolidating control functions
2Adaptability or versatility
If additional drive circuits are added to control metal oxide transistors in LTPO technology, then display functionality is improved, but production cost increases
Solution Approach 1:
The patent merges multiple control functions into a single control drive circuit located in the rounded corner region, reducing the total number of circuit components and simplifying the manufacturing process. This consolidation decreases production costs while maintaining full display functionality
Solution Approach 2:
The control drive circuit is positioned in the rounded corner region rather than occupying additional space in the display matrix. This spatial optimization allows the circuit to be integrated into the existing substrate layout without requiring extra manufacturing steps or additional substrate area, thereby reducing production costs
3Reliability
If signal lines are arranged in traditional non-overlapping patterns, then signal connectivity is maintained, but bezel area increases
Solution Approach 1:
The patent utilizes vertical stacking of signal lines in different layers to achieve spatial efficiency. By allowing orthographic projections of signal lines to overlap in the rounded corner region, the design reduces the horizontal space required, thereby minimizing the bezel area while maintaining signal connectivity through proper electrical connections in the vertical dimension
Solution Approach 2:
The patent applies different layout strategies to different regions of the substrate. In the rounded corner region, signal lines are allowed to overlap in projection to minimize bezel area, while in other regions traditional non-overlapping arrangements are maintained to ensure signal integrity. This localized optimization achieves both goals
4Area of stationary object
If signal lines overlap in rounded corner regions, then bezel area is reduced, but signal crosstalk may increase
Solution Approach 1:
The patent places overlapping signal lines in different vertical layers, using the vertical dimension to separate signals that would otherwise be adjacent in the horizontal plane. This spatial separation reduces electromagnetic coupling and signal crosstalk while still allowing the projections to overlap in the rounded corner region, thereby maintaining a narrow bezel
Data Source
AI summary
Disclosed are a display substrate and a display apparatus, wherein the display substrate includes a display region and a non-display region which includes a rounded corner region; the display substrate includes a circuit structure layer including a pixel circuit and a control drive circuit; the circuit structure layer further includes a plurality of reset output lines and a plurality of reset transfer lines located in the non-display region and disposed on a side of the control drive circuit close to the display region, and an extension direction of the reset output line and an extension direction of the reset transfer line intersect; the reset transfer line is connected with the pixel circuit; an orthographic projection of at least one reset transfer line located in the rounded corner region on the base substrate is partially overlapped with orthographic projections of the plurality of reset output lines on the base substrate.