In-cell Touch Display Static-Electricity Shield Layer Design
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Solution Overview
Problem
In-cell touch liquid crystal display screens face interference from external electromagnetic waves and static-electricity, which can disable the touch function due to the conductive layers used for shielding.
Innovation Solution
A static-electricity shield layer is disposed on the light emitting side of the upper substrate with hollowed-out areas corresponding to the image display area, allowing touch signals to be sensed without being shielded, and is formed using transparent conductive materials like carbon nanotubes or silver nanowires connected to ground or conductive lines to prevent external interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conductive layer with good conductivity is disposed on the color filter substrate to shield external electromagnetic waves and static-electricity, then the shielding effect is improved, but the touch function is disabled due to interference with touch signals
Solution Approach 1:
The conductive layer is segmented into isolated conductive islands rather than forming a continuous shield. Each conductive island is positioned to shield specific areas while leaving gaps that allow touch signals to pass through, thus maintaining both shielding effectiveness and touch functionality
Solution Approach 2:
The shielding structure is designed with non-uniform distribution - conductive islands are strategically positioned in areas where external interference needs to be blocked, while maintaining transparency and signal permeability in areas where touch sensing is critical. This creates different local properties within the same shield layer
2Object-affected harmful factors
If a continuous conductive layer is used for shielding, then external interference is blocked, but transmittance of light and touch signals is reduced
Solution Approach 1:
The continuous conductive layer is divided into discrete conductive islands separated by transparent gaps. This segmentation allows light to pass through the gaps while the conductive islands provide localized shielding, thus maintaining both protection and transmittance
Solution Approach 2:
The shield layer is designed with a porous or discontinuous structure consisting of isolated conductive regions. This porous configuration allows electromagnetic waves and light to pass through the voids while the conductive regions block harmful static-electricity and low-frequency interference
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
The solution effectively prevents interference from external electromagnetic waves and static-electricity while maintaining the sensitivity of touch sensing, ensuring the touch function is not disabled and reducing transmittance loss in the display device.
Implementation Method 1
The conductive layer is generally formed with good conductivity, so that the conductive layer can shield external electromagnetic waves or static-electricity
Implementation Method 2
the static-electricity shield layer is formed using transparent conductive materials like carbon nanotubes or silver nanowires connected to ground or conductive lines
Data Source
AI summary
An in-cell touch display screen and a display device are provided. The in-cell touch display screen comprises an upper substrate and a lower substrate that are cell-assembled, and a plurality of first touch electrodes and a plurality of second touch electrodes that are disposed on the upper substrate and/or the lower substrate without contacting each other; the display screen comprises an image display area, a static-electricity shield layer is disposed on a light emitting side of the upper substrate, and the static-electricity shield layer comprises a plurality of hollowed-out areas corresponding to the image display area. The in-cell touch display screen can resolve a problem that the static-electricity shield layer of a common in-cell touch display screen may shield touch signals.