Array Substrate Planarization Layer for Touch Display Light Leakage

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Solution Overview

Problem

The existing array substrates for touch display panels face issues with surface flatness due to touch wiring, leading to light leakage during the rubbing process, which affects the overall performance of the display.

Innovation Solution

The planarization layer is disposed on top of the touch wiring layer to improve the flatness of the film layers, thereby alleviating light leakage and enhancing the display's performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the touch wiring is formed on the planarization layer, then the touch sensing function can be integrated, but the surface flatness deteriorates causing light leakage

Engineering Contradiction:

Improvetouch sensing function integrationVSAvoidsurface flatness

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent introduces a new spatial dimension by adding a planarization layer above the touch wiring layer. This vertical stacking approach allows the touch wiring to remain functional while the planarization layer provides a flat upper surface, effectively resolving the flatness issue without removing the touch sensing capability.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The planarization layer acts as an intermediary element between the touch wiring layer and the subsequent film layers. It mediates the conflict by providing a flat interface for the rubbing process while allowing the underlying touch wiring to maintain its electrical and sensing functions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If the touch wiring is exposed on the surface, then the structure is simpler, but light leakage occurs during rubbing process

Engineering Contradiction:

Improvelayer structureVSAvoidlight leakage

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the potentially harmful effect of having exposed wiring (which causes light leakage) into a beneficial configuration by placing the wiring in its own dedicated layer. The planarization layer then covers this wiring, transforming the exposed wiring problem into a structured solution where the wiring remains accessible for electrical connections but is protected from causing light leakage during the rubbing process.

Inventive Principle:

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

Data Source

PatentUS9811191B2Array substrate and manufacture method thereof, and touch display panel

Publication Date: 2017.11.07 XIAMEN TIANMA MICRO ELECTRONICS

AI summary

An array substrate, a manufacture method thereof and a touch display panel. The array substrate includes a base; a plurality of thin film transistors arranged in a matrix form, each of which including a gate electrode, a source electrode and a drain electrode; a first insulation layer located on the thin film transistor; a touch wiring layer which is disposed on the first insulation layer and includes a plurality of touch wirings; and a planarization layer covering the touch wiring layer. In some embodiments of the disclosure, the planarization layer covers the touch wiring layer, making the flatness over the touch wirings better, thus alleviating the light leakage at both sides of the touch wiring after the rubbing process.