Stereoscopic Touch Display Device With Liquid Crystal Layer

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Solution Overview

Problem

In-cell touch display panels face challenges in maintaining touch functionality due to distance variations in coupling capacitance and noise from 2D/3D switch structures, leading to reduced performance and increased thickness and weight when trying to provide stereoscopic displays.

Innovation Solution

A stereoscopic touch display device is designed with a display panel and a touch panel featuring a first and second substrate, a liquid crystal layer, receiver electrodes, transmitter electrodes, common electrodes, a signal driver, and a common potential providing unit, where the signal driver transmits high-frequency touch signals that do not trigger liquid crystal molecules, allowing for simultaneous stereoscopic display and touch functionality while reducing thickness and weight.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a 2D/3D switch structure is installed on the in-cell touch display panel to present planar and stereoscopic images, then stereoscopic display function is achieved, but noise from the switch structure causes the touch function to be lost

Engineering Contradiction:

Improvestereoscopic display functionVSAvoidtouch function

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the electrode functions by separating touch detection electrodes from display control electrodes. The touch panel includes first electrodes for touch detection and second electrodes for display control, allowing independent operation and eliminating interference between touch and stereoscopic display functions

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a liquid crystal layer as an intermediary between the touch electrodes and the display panel. This liquid crystal layer acts as a mediator that allows touch signals to pass through while enabling stereoscopic display, resolving the conflict between touch functionality and stereoscopic imaging

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the touch signal detecting structure is spaced apart by a liquid crystal panel to reduce noise ratio, then touch signal quality is improved, but the distance becomes too far causing loss of touch function

Engineering Contradiction:

Improvetouch signal qualityVSAvoiddistance between touch detecting structure and signal source

Core Design Contradiction:

Measurement precisionVSLength of stationary object

Solution Approach 1:

The patent transitions from a planar arrangement to a three-dimensional configuration by stacking multiple electrode layers at different positions. The touch detecting electrodes are positioned in a second substrate while display electrodes are in a first substrate, creating vertical separation that reduces noise while maintaining detection effectiveness through the liquid crystal medium

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If an on-cell touch panel is used to maintain touch function, then touch detection is achieved, but overall thickness and weight of the device increase

Engineering Contradiction:

Improvetouch functionVSAvoidoverall weight

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

The patent merges the touch panel and display panel into a single integrated structure. Both touch detection and display functions are achieved within one panel assembly, eliminating the need for separate components and reducing overall thickness and weight while maintaining full functionality

Inventive Principle:

Principle #5Merging (Combining)

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 effective detection of touch signals with reduced noise interference and enhanced transmittance, maintaining both touch and stereoscopic display functions without affecting the display images.

Implementation Method 1

detecting the receiving touch signals generated from coupling capacitances between the receiver electrodes and at least one portion of the transmitter electrodes

Methodology Applied

Scientific EffectCoupling capacitance: Capacitance

Data Source

PatentUS9377647B2Stereoscopic touch display device

Publication Date: 2016.06.28 AU OPTRONICS CORP

AI summary

A stereoscopic touch display device includes a display panel and a stereoscopic touch panel. The stereoscopic touch panel includes a first substrate, a second substrate, a liquid crystal layer, receiver electrodes, transmitter electrodes, common electrodes, a signal driver, and a common potential providing unit. The liquid crystal layer is disposed between the first and second substrates. The receiver electrodes and the common electrodes are disposed on the first substrate. The transmitter electrodes are disposed on the second substrate. The signal driver is electrically connected to the transmitter electrodes and the receiver electrodes. The signal driver is configured for providing transmitting touch signals to the transmitter electrodes and detecting receiving touch signals generated from coupling capacitances between the receiver electrodes and the transmitter electrodes in sequence. Each of the transmitting touch signals is configured so as to be unable to trigger liquid crystal molecules of the liquid crystal layer.