Display Device Signal Line Routing for Frameless Design
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Solution Overview
Problem
Conventional display devices with light emitting diodes struggle to create a frameless design due to the placement of driver circuits and control signal lines, which can cause color unevenness in the displayed image.
Innovation Solution
The display device incorporates a substrate with a pixel array, light emission control signal lines, scanning signal lines, a scanning signal line driving circuit, and a driving control signal line arranged in a specific pattern to minimize the intersection points of signal lines, along with a compensation signal line to reduce parasitic capacitance and color unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If driver circuits and control signal lines are placed on the periphery of the image display section, then the display device structure is simple, but the frame portion width cannot be narrowed or eliminated
Solution Approach 1:
The patent moves the scanning signal line driving circuit from the peripheral region onto the active area of the substrate, specifically placing it in a region that can be utilized within the display area. This spatial reconfiguration allows the frame portion to be narrowed or eliminated while maintaining circuit functionality.
Solution Approach 2:
The patent divides the substrate into distinct regions: an active area containing the pixel array and driving circuits, and a peripheral region. By segmenting the functional areas, the driving circuits are integrated within the active area, enabling frameless design while maintaining organizational structure.
2Length of stationary object
If driver circuits and control signal lines are placed in the image display section, then the frame portion width can be narrowed or eliminated, but control signal transmission may affect light emitting element driving current causing color unevenness
Solution Approach 1:
The patent applies different wiring layout strategies to different regions. Light emission control signal lines are routed to minimize intersection with the driving control signal line in specific areas, while the scanning signal line driving circuit is placed in a designated region. This localized optimization reduces parasitic capacitance effects and prevents color unevenness.
Solution Approach 2:
The patent acknowledges the potential harmful effect of signal line intersections causing color unevenness, but converts this challenge into a design constraint that guides the wiring layout. By deliberately planning the light emission control signal line routes to minimize intersections with the driving control signal line, the design transforms a potential defect into a controlled design parameter, achieving both frameless structure and color uniformity.
3Device complexity
If light emission control signal lines intersect with driving control signal line, then wiring layout is simplified, but parasitic capacitance increases causing color unevenness
Solution Approach 1:
The patent implements differentiated wiring strategies: light emission control signal lines are routed to minimize intersection with the driving control signal line, while scanning signal lines are managed through the scanning signal line driving circuit. This localized wiring optimization reduces parasitic capacitance at critical intersection points, preventing color unevenness while maintaining overall wiring simplicity.
Solution Approach 2:
The patent transforms the potential harmful effect of signal line intersections into a controlled design feature. By deliberately routing light emission control signal lines to minimize intersections with the driving control signal line, the design converts what could be a source of color unevenness into a structured wiring pattern that achieves both simplicity and precision.
Data Source
AI summary
A display device includes a substrate, a pixel array placed on a first surface side of the substrate, light emission control signal lines, scanning signal lines, a scanning signal line driving circuit, and a driving control signal line. The driving control signal line includes a first portion, a second portion, and third portions. The light emission control signal lines include a first light emission control signal line and a second light emission control signal line, and a number of intersecting portions of the first light emission control signal line and the first portion is smaller than a number of intersecting portions of the second light emission control signal line and the third portions.