Array Substrate Signal Line Routing for Display Aperture

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Solution Overview

Problem

Full-screen display devices face challenges in maintaining a high screen-to-body ratio due to the presence of light apertures, which can lead to reduced light transmittance and charging efficiency of sub-pixels, resulting in dark vertical stripes and compromised display effects.

Innovation Solution

The array substrate design incorporates a light aperture region with a winding region, where first and second signal lines with overlapping windings are arranged in different layers, allowing for same-polarity voltage application, reducing parasitic capacitance and enhancing charging efficiency by employing a MUX drive controller for time-sharing charging.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a light aperture is provided in the display screen to accommodate photosensitive sensors, then the screen-to-body ratio is maintained high, but the light transmittance and charging efficiency of sub-pixels are reduced, resulting in dark vertical stripes

Engineering Contradiction:

Improvescreen-to-body ratioVSAvoidlight transmittance and sub-pixel luminance

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent transitions signal line arrangement from a two-dimensional plane to a three-dimensional structure by introducing overlapping windings in different layers. The first and second signal lines are arranged in different layers with their orthographic projections overlapping on the substrate, utilizing the vertical dimension to reduce parasitic capacitance while maintaining planar integration.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The signal lines are segmented into multiple layers with distinct winding regions. The first signal line includes a first pixel connection wiring and a first winding, while the second signal line includes a second pixel connection wiring and a second winding. This segmentation allows independent optimization of each layer's path to minimize interference.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If signal lines are arranged in the winding region around the light aperture, then routing flexibility is improved, but parasitic capacitance between signal lines increases due to close proximity

Engineering Contradiction:

Improvesignal line routing flexibilityVSAvoidparasitic capacitance between signal lines

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent utilizes the vertical dimension by arranging the first and second signal lines in different layers. The orthographic projections of these signal lines overlap on the substrate, but their physical separation in the vertical direction significantly reduces parasitic capacitance while allowing flexible routing around the light aperture region.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent introduces an insulating layer between the first and second signal lines arranged in different layers. This intermediary layer acts as a dielectric barrier that further reduces parasitic capacitance coupling between the overlapping signal lines while maintaining their routing flexibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If different polarity voltages are applied to adjacent signal lines to reduce interference, then signal integrity is improved, but charging efficiency of sub-pixels connected to these signal lines is reduced

Engineering Contradiction:

Improvesignal integrityVSAvoidcharging efficiency of sub-pixels

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent arranges the first and second signal lines in different layers with overlapping projections, which reduces parasitic capacitance to such an extent that adjacent signal lines can be charged simultaneously without significant interference. This spatial separation in the vertical dimension allows same-polarity voltages to be applied while maintaining signal integrity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

4Area of stationary object

If signal lines are routed through the winding region in close proximity to reduce overall device area, then device compactness is improved, but light transmittance in the winding region is reduced

Engineering Contradiction:

Improvedevice areaVSAvoidlight transmittance in winding region

Core Design Contradiction:

Area of stationary objectVSIllumination intensity

Solution Approach 1:

The patent routes signal lines in different layers with overlapping projections, allowing the winding region to be utilized more efficiently. This three-dimensional arrangement reduces the horizontal footprint of the signal lines while minimizing their visual and physical obstruction to light passing through the winding region.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS11531241B2Array substrate and display device

Publication Date: 2022.12.20 ORDOS YUANSHENG OPTOELECTRONICS

AI summary

A substrate in an array substrate includes a light aperture region and a winding region arranged around the light aperture region. On the substrate, an orthographic projection of a first winding in each first signal line is overlapped with an orthographic projection of a second winding in a corresponding second signal line. In this way, the distance between two adjacent signal lines in the winding region is larger, and the parasitic capacitance generated between them is smaller.