Touch Display With Infrared Pattern for Stylus Angle Detection

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Solution Overview

Problem

Existing touch display devices face challenges in accurately detecting the inclination angle of a stylus, leading to suboptimal touch performance, particularly when using active styluses that rely on infrared light reflection.

Innovation Solution

A touch display device incorporating an infrared reflective pattern and an infrared blocking film to enhance the detection of reflected infrared light, optimizing the stacked structure to improve stylus inclination angle dependence and reduce unwanted reflections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an infrared blocking film is added to reduce unwanted reflections, then measurement precision improves, but device complexity increases

Engineering Contradiction:

Improvestylus inclination angle detectionVSAvoidstacked structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The infrared management function is segmented into two distinct components: an infrared reflective pattern layer and an infrared blocking film layer. Each layer performs a specific function - the reflective pattern redirects infrared light while the blocking film absorbs remaining infrared radiation. This segmentation allows the system to achieve superior infrared control and stylus detection precision without requiring a single complex component.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The infrared reflective pattern acts as an intermediary element between the stylus and the infrared blocking film. It first interacts with the reflected infrared light from the stylus, redirecting it toward the blocking film, which then absorbs the remaining infrared radiation. This intermediary approach enables gradual infrared light management, improving detection precision while maintaining manageable device complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If an infrared reflective pattern is added to enhance infrared light detection, then measurement precision improves, but device complexity increases

Engineering Contradiction:

Improvereflected infrared light detectionVSAvoidstacked structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The infrared detection function is divided into two specialized layers: the infrared reflective pattern for redirecting and concentrating reflected infrared light, and the infrared blocking film for absorbing stray infrared radiation. This segmentation enables each layer to be optimized for its specific function, improving overall detection precision while keeping individual component complexity manageable.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The infrared reflective pattern is strategically positioned and designed with specific local properties to maximize infrared light reflection and concentration in critical areas. By concentrating infrared light locally where detection is most needed, the system achieves enhanced measurement precision without requiring the entire device structure to be complex.

Inventive Principle:

Principle #3Local quality

3Measurement precision

If multiple layers are stacked to improve touch performance, then measurement precision improves, but manufacturing complexity increases

Engineering Contradiction:

Improvestylus coordinates detectionVSAvoidstacked structure fabrication

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The multi-layer structure is segmented into functionally distinct layers that can be manufactured and tested independently before final assembly. The infrared reflective pattern layer and infrared blocking film layer are designed as separate components with clear interfaces, allowing for modular manufacturing processes and simplifying quality control despite the overall system complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The stacked structure incorporates layers that serve multiple functions: the infrared reflective pattern not only manages infrared light but also maintains display visibility, while the infrared blocking film provides both infrared absorption and structural support. This multi-functionality reduces the need for additional dedicated components, easing manufacturing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 enhances touch performance by improving the detection of stylus coordinates through the use of an infrared reflective pattern and blocking film, reducing power consumption and simplifying driving operations.

Implementation Method 1

an infrared blocking film that effectively reduces infrared light reflected in the touch display device

Methodology Applied

Scientific EffectInfrared light blocking: Absorption (EM radiation)

Implementation Method 2

an infrared reflective pattern disposed on an inner or outer surface of the infrared blocking film

Methodology Applied

Scientific EffectInfrared light reflection: Reflection

Data Source

PatentUS12443302B2Touch display device

Publication Date: 2025.10.14 LG DISPLAY CO LTD

AI summary

A touch display device is disclosed. The touch display device includes a display panel. The display panel includes a light emitting element and a transistor made of a plurality of metal electrodes. The touch display device includes an infrared blocking film disposed on an emission surface of the display panel. The touch display device includes an infrared reflective pattern disposed on an inner or outer surface of the infrared blocking film.