In-Cell Touch Display Substrate Layout to Prevent Light Leakage

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Solution Overview

Problem

Existing display substrates with in-cell touch functionality face high costs due to a large number of source drivers and issues with fringing electric fields causing light leakage and reduced pixel aperture ratios, particularly in oxide multi-gate structures.

Innovation Solution

A display substrate design with laterally arranged pixel electrodes and optimized aperture structures in the first electrode, ensuring non-overlapping orthogonal projections with gate lines to prevent fringing electric fields and enhance pixel aperture ratios.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the common electrode is divided into blocks and an aperture structure is arranged above the gate line to achieve touch function, then the touch function is provided, but a fringing electric field is formed between the gate line and the common electrode causing light leakage and requiring a wider black matrix which decreases the pixel aperture ratio

Engineering Contradiction:

Improvetouch functionVSAvoidpixel aperture ratio

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent extracts the aperture structure from the common electrode and relocates it to the pixel electrode. This separation removes the source of the fringing electric field problem while preserving the touch function, as the aperture structure remains in the display area but no longer creates harmful fields with the gate line.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the aperture structure function between two electrodes: the common electrode maintains continuity for touch functionality, while the pixel electrode contains the aperture structure for light transmission. This segmentation resolves the conflict between touch function and light leakage.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If a wider black matrix is provided to prevent light leakage from fringing electric fields, then light leakage is prevented, but the pixel aperture ratio decreases

Engineering Contradiction:

Improvelight leakage preventionVSAvoidpixel aperture ratio

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

The patent converts the potentially harmful fringing electric field configuration into a beneficial arrangement by placing the aperture structure in the pixel electrode rather than the common electrode. This eliminates the light leakage issue while maintaining the aperture structure's light transmission function, effectively turning a problem configuration into a solution.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Quantity of substance

If the quantity of data lines is reduced to 1/3 of existing products, then the quantity of source drivers and cost are reduced, but the complexity of wiring region arrangement increases

Engineering Contradiction:

Improvenumber of data linesVSAvoidwiring region arrangement

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent transitions from a conventional vertical data line arrangement to a lateral pixel electrode extension arrangement. This dimensional change allows for fewer data lines while maintaining display functionality, as the pixel electrodes extend laterally to connect with fewer data lines rather than requiring multiple vertical connections.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

Reduces the number of data lines and source drivers, lowers production costs, and increases light transmittance by 10% while preventing light leakage, thereby improving the competitiveness of the display product.

Implementation Method 1

a fringing electric field is formed between the gate line and the common electrode, so the deflection of liquid crystals and thereby L0 leakage occur

Methodology Applied

Scientific EffectFringing electric field: Electric Field

Implementation Method 2

an orthogonal projection of the aperture structure onto the substrate is spaced apart from an orthogonal projection of the first line at a first side of the aperture structure onto the substrate by a first distance, the orthogonal projection of the aperture structure onto the substrate is spaced apart from an orthogonal projection of the first line at a second side of the aperture structure onto the substrate by a second distance

Methodology Applied

Scientific EffectElectric field shielding through geometric arrangement: Electric Field

Data Source

PatentUS20260023290A1Display substrate

Publication Date: 2026.01.22 HEFEI XINSHENG OPTOELECTRONICS TECH CO LTD

AI summary

A display substrate. The display substrate includes a substrate, and a first electrode, a second electrode, a plurality of first lines and a plurality of second lines arranged on the substrate. The second electrode includes a plurality of second electrode members arranged in an array form, an orthogonal projection of the second electrode onto the substrate is independent of an orthogonal projection of a first wiring region onto the substrate, and an orthogonal projection of the first electrode onto the substrate overlaps with the orthogonal projection of the first wiring region onto the substrate. The first electrode in at least one of the pixel regions has an aperture structure.