Array Substrate Wiring Layout for Under-Display Light Sensing

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Solution Overview

Problem

Current display technologies face challenges in achieving a high screen-to-body ratio due to the placement of sensing components, which reduces the area available for image display and leads to diffraction issues when light passes through the display panel, affecting the accuracy and quality of images captured by sensors like front cameras.

Innovation Solution

The display panel is designed with a transparent sensing component region and a non-sensing component region, where the sensing component is placed on the non-display surface, and the use of light-shielding strips to minimize diffraction by adjusting the density and arrangement of wirings in the sensing component region, allowing more light to pass through and improving image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If sensing components are placed on the display surface, then light sensing function is achieved, but screen-to-body ratio is reduced and diffraction issues occur

Engineering Contradiction:

Improvelight sensing accuracyVSAvoiddisplay area

Core Design Contradiction:

Illumination intensityVSArea of stationary object

Solution Approach 1:

The sensing component is moved from the display surface (2D plane) to the non-display surface (another dimension), allowing light to pass through the display panel to reach the sensor. This spatial relocation resolves the conflict between maintaining display area and achieving light sensing function.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

A transparent sensing component region is introduced as an intermediary structure that allows light to pass through while providing electrical connection pathways. This mediator enables both full-screen display and under-display sensing functionality to coexist.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If wiring density is increased in the sensing component region, then electrical connection is improved, but diffraction of light increases

Engineering Contradiction:

Improveelectrical connectionVSAvoiddiffraction

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Different wiring density configurations are applied to different regions: the first wiring group maintains higher density for reliable electrical connection, while the second wiring group uses lower density to minimize diffraction. This localized differentiation resolves the contradiction between connection reliability and diffraction reduction.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The wirings are divided into multiple groups (first wiring group and second wiring group) with different density characteristics. This segmentation allows each group to be optimized for its specific function - one for electrical reliability and another for optical performance.

Inventive Principle:

Principle #1Segmentation

3Area of stationary object

If transparent sensing component region is created, then screen-to-body ratio is improved, but wiring arrangement complexity increases

Engineering Contradiction:

Improvescreen-to-body ratioVSAvoidwiring arrangement

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The wirings are segmented into multiple groups with different arrangement patterns. The first wiring group follows one pattern for electrical reliability, while the second wiring group follows another pattern for diffraction reduction. This segmentation manages the complexity by organizing it into functional modules.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different parameters (density, spacing, arrangement patterns) are applied to different wiring groups within the transparent sensing component region. This parameter variation allows optimization of both electrical and optical performance while managing structural complexity through systematic design.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design enhances the screen-to-body ratio, allowing for full-screen displays while maintaining accurate light sensing, resulting in improved image brightness and definition captured by sensors.

Implementation Method 1

leads to diffraction issues when light passes through the display panel

Methodology Applied

Scientific EffectDiffraction: Diffraction

Implementation Method 2

use of light-shielding strips to minimize diffraction by adjusting the density and arrangement of wirings

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Data Source

PatentUS11935901B2Array substrate, display panel, and display device

Publication Date: 2024.03.19 BOE TECHNOLOGY GROUP CO LTD

AI summary

A display panel has a first region and a second region on side(s) thereof, a light transmittance of the first region is greater than that of the second region. The display panel includes pixels, first wirings arranged in a second direction that intersect a first region, and second wirings arranged in the first direction, all of which are in the first region and the second region. The first wirings and the second wirings are electrically connected to the pixels. First wirings passing through the first region are divided into first wiring groups, and first wirings in each first wiring group are gathered in the first region to constitute a first gathering portion. A distance between two adjacent first wirings in the second region is less than a distance between two adjacent first gathering portions, and is greater than a distance between two adjacent first wirings in the first gathering portion.