Anti-Peeping Touch Display Layer Structure for Privacy and Accuracy

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Solution Overview

Problem

Touch display devices that combine anti-peeping and touch functions often experience reduced touch recognition and picture contrast issues, with anti-peeping films either falling off or compromising display quality.

Innovation Solution

A screen anti-peeping protection layer comprising a first polarizing layer, a second polarizing layer, a viewing angle adjusting layer, and a touch sensing layer, arranged sequentially on the display beam transmission path, allowing for touch functionality while adjusting the emitted light viewing angle and maintaining display quality by stabilizing the touch sensing layer above the viewing angle adjusting layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the anti-peeping function is combined with the touch function in a touch display device, then the viewing angle can be adjusted to protect privacy, but the touch recognition accuracy is reduced

Engineering Contradiction:

Improveanti-peeping functionVSAvoidtouch recognition accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent divides the protective layer into multiple independent functional layers: a first polarizing layer for anti-peeping, a second polarizing layer for touch sensing, and a viewing angle adjusting layer. Each layer performs its specific function independently, preventing interference between anti-peeping and touch recognition functions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The viewing angle adjusting layer acts as an intermediary between the first and second polarizing layers. It controls the viewing angle to achieve anti-peeping effect while allowing the second polarizing layer to maintain proper interaction with the touch sensing layer for accurate touch recognition.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the anti-peeping film is added to the touch display device, then the viewing angle can be controlled, but the picture contrast is reduced

Engineering Contradiction:

Improveviewing angle controlVSAvoidpicture contrast

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent uses a composite structure of multiple polarizing layers with specific optical properties. The first polarizing layer provides anti-peeping functionality while the second polarizing layer maintains display quality. The viewing angle adjusting layer composed of specific materials optimizes both viewing angle control and picture contrast preservation.

Inventive Principle:

Principle #40Composite materials

3Device complexity

If the touch sensing layer is placed adjacent to the viewing angle adjusting layer, then the structure is simplified, but the anti-peeping film may fall off and display quality deteriorates

Engineering Contradiction:

Improvelayer structureVSAvoidfilm stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent separates the touch sensing layer from the viewing angle adjusting layer by introducing the second polarizing layer as an intermediate layer. This segmentation prevents direct contact that could cause delamination while maintaining the structural integrity and display quality.

Inventive Principle:

Principle #1Segmentation

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 touch misjudgment and maintains good display picture quality in both normal and anti-peeping modes by adjusting the viewing angle and stabilizing the touch sensing layer, enhancing the user experience without compromising recognition accuracy.

Implementation Method 1

The first polarizing layer and the second polarizing layer are sequentially arranged on a transmission path of a display beam

Methodology Applied

Scientific EffectPolarisation: Polarisation

Implementation Method 2

The viewing angle adjusting layer is arranged on the transmission path and located between the first polarizing layer and the second polarizing layer, and used for changing a range of an emitted light viewing angle of the display beam

Methodology Applied

Scientific EffectOptical refraction and polarization control: Refraction

Data Source

PatentUS11215855B2Screen anti-peeping protection layer and touch display device

Publication Date: 2022.01.04 CORETRONIC CORPORATION

AI summary

The disclosure provides a screen anti-peeping protection layer arranged above a display panel. The screen anti-peeping protection layer includes a first polarizing layer, a second polarizing layer, a viewing angle adjusting layer and a touch sensing layer. The first polarizing layer and the second polarizing layer are sequentially arranged on a transmission path of a display beam which comes from the display panel. The viewing angle adjusting layer is arranged on the transmission path and located between the first polarizing layer and the second polarizing layer, and used for changing a range of an emitted light viewing angle of the display beam. The touch sensing layer is arranged on the transmission path, and located above the viewing angle adjusting layer and opposite to the first polarizing layer. The disclosure also provides a touch display device including the screen anti-peeping protection layer and the display panel as described above.