Integrated Touch Display Signal Electrode Layer Design

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Solution Overview

Problem

Conventional touch display panels manufactured by assembling separate touch and display panels result in higher costs, increased weight, and lower optical transmittance, while integrated touch structures face challenges in maintaining mutual functionality without interference.

Innovation Solution

A touch display device with a built-in touch sensing structure, where the pixel array structure employs a signal electrode layer for both pixel driving and touch sensing, with a signal transmission layer designed to minimize overlap with data lines, reducing signal noise ratio and enhancing touch sensing performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If separate touch panel and display panel are assembled together, then touch function and display function are both achieved, but cost increases, weight increases, and optical transmittance decreases

Engineering Contradiction:

Improvetouch function and display functionVSAvoidweight

Core Design Contradiction:

Adaptability or versatilityVSWeight of stationary object

Solution Approach 1:

The patent merges the touch panel and display panel into a single integrated structure where the touch sensing structure is built within the display panel layers. The signal electrode layer serves dual purposes as both display electrode and touch sensing electrode, eliminating the need for separate touch and display panels while reducing overall weight and improving optical transmittance.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The signal electrode layer is designed to perform multiple functions simultaneously: it acts as an electrode for the display function while also serving as the sensing electrode for touch detection. This multi-functional design eliminates redundant components and reduces the overall structure weight.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If separate touch panel and display panel are assembled together, then touch function and display function are both achieved, but cost increases and optical transmittance decreases

Engineering Contradiction:

Improvetouch function and display functionVSAvoidoptical transmittance

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Weight of stationary object

If built-in touch structure is integrated in display panel, then volume is reduced and cost is reduced, but mutual interference between display function and touch function occurs

Engineering Contradiction:

ImproveweightVSAvoidmutual functionality without interference

Core Design Contradiction:

Weight of stationary objectVSReliability

Solution Approach 1:

The patent segments the electrode structure into distinct layers: the first electrode layer for display function and the signal electrode layer for touch sensing function. This segmentation allows each layer to perform its specific function independently while maintaining close integration, thereby avoiding mutual interference between display and touch functions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent resolves interference issues by separating functions in the vertical dimension (different layers) rather than horizontal dimension. The first electrode layer and signal electrode layer are stacked vertically, allowing both display and touch functions to operate simultaneously without spatial interference while maintaining a compact integrated structure.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

4Area of stationary object

If signal transmission layer overlaps data line, then wiring space is reduced, but signal noise ratio increases and touch sensing performance deteriorates

Engineering Contradiction:

Improvewiring spaceVSAvoidsignal noise ratio

Core Design Contradiction:

Area of stationary objectVSMeasurement precision

Solution Approach 1:

The patent allows partial overlap between the signal transmission layer and data line in the line-width direction, but deliberately limits the extent of overlap in the planar projection. This partial overlap approach reduces wiring space while controlling the parasitic capacitance to maintain acceptable signal noise ratio and touch sensing performance.

Inventive Principle:

Principle #16Partial or excessive action

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 enables a compact, cost-effective touch display device with improved touch sensing capability and reduced signal noise ratio, achieving a built-in touch sensing function without compromising display performance.

Implementation Method 1

the pixel array structure employs a signal electrode layer for both pixel driving and touch sensing

Methodology Applied

Scientific EffectElectric Field: Electric Field

Data Source

PatentUS10761359B2Touch display device

Publication Date: 2020.09.01 INNOLUX CORP

AI summary

A touch display device including a first substrate, a second substrate, a display medium, and a pixel array structure is provided. The pixel array structure includes a scan line, a data line, an active device, pixel electrodes, a signal electrode layer and a signal transmission layer. The scan line intersects the data line. The active device is connected to the scan line and the data line. The pixel electrodes are arranged in an array. The signal electrode layer includes signal electrodes. The signal transmission layer includes a signal line disposed between two adjacent columns of the pixel electrodes and electrically connected to one of the signal electrodes. The data line includes at least a portion located outside of the signal line.