In-cell Touch Panel Black Matrix Disconnection for Signal Isolation

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Solution Overview

Problem

In in-cell touch panels, the continuous black matrix connecting sensing and driving electrodes can cause electrical conduction issues, leading to malfunction, and the disconnected portions allow light leakage, compromising touch signal generation and display quality.

Innovation Solution

The black matrix is disconnected between sensing and driving electrodes, with the disconnected portions blocked by an opaque material, such as extended color filters or opaque data/gate lines, to prevent electrical conduction and light leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the black matrix is continuously distributed on the entire color filter substrate to provide structural support and electrical isolation, then the structural integrity and electrode isolation are improved, but the sensing electrodes and driving electrodes may be connected through the conductive black matrix, causing malfunction

Engineering Contradiction:

Improveelectrode independenceVSAvoidelectrical conduction between electrodes

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The black matrix is divided into separate regions with openings between them, isolating the sensing electrodes from the driving electrodes. This segmentation prevents electrical conduction between the two electrode types while maintaining the structural support function of the black matrix in each region.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The conductive pathway of the black matrix is extracted or removed in specific regions where electrode isolation is needed. By taking out the black matrix material between the sensing and driving electrodes, the patent eliminates the harmful electrical conduction while preserving the black matrix's structural function in other areas.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If the black matrix is disconnected between sensing electrodes and driving electrodes to prevent electrical conduction, then electrode independence is improved, but light leakage occurs through the disconnected portions

Engineering Contradiction:

Improveelectrode independenceVSAvoidlight leakage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

An opaque material is introduced as an intermediary substance to fill the gaps between the disconnected black matrix portions. This intermediary blocks light leakage through the openings while maintaining the electrical isolation between sensing and driving electrodes, as the opaque material does not conduct electricity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies different properties to different parts of the black matrix structure. The black matrix is conductive in regions needing structural support and electrical isolation, but opaque materials are applied locally in the disconnected portions to block light without conducting electricity, thus满足不同功能需求

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9158145B2In-cell touch panel and color filter substrate thereof

Publication Date: 2015.10.13 SHANGHAI TIANMA MICRO ELECTRONICS CO LTD

AI summary

A color filter device for in-cell touch panel is disclosed. The device includes a substrate, a black matrix with a plurality of openings that is formed on the substrate, and a plurality of sensing electrodes and a plurality of driving electrodes both formed on the black matrix. The sensing electrodes are independent of the driving electrodes, the black matrix is disconnected between the sensing electrodes and the driving electrodes, and the disconnected portion of the black matrix is blocked by an opaque material.