Light Shielding Structure for Icon Region in Electronic Device

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Solution Overview

Problem

Touch display modules in electronic devices suffer from light leakage in the visible area due to lateral transmission of light from the backlight module through the touch-sensitive film and optical adhesive, affecting product yield, competitiveness, and user experience.

Innovation Solution

The electronic device incorporates a light shielding element and a second light shielding layer on the touch sensitive film to absorb light transmitted from the first optical adhesive and touch sensitive film in the non-visible area, ensuring that light does not enter the visible area, while allowing light to pass through icon openings for user interaction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a backlight module is disposed below the icon to light up the icons, then the icons become easily identifiable, but light leaks into the visible area of the screen through the touch-sensitive film and optical adhesive, affecting product yield and user experience

Engineering Contradiction:

Improveicon illuminationVSAvoidlight leakage

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The light shielding structure is divided into multiple segments: a first light shielding layer at the bottom, a light shielding element in the middle, and a second light shielding layer at the top. Each segment serves a specific function in blocking light at different locations, collectively preventing light leakage while maintaining icon illumination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The light shielding layers and light shielding element are specifically positioned to provide localized light blocking only in the non-visible area where icons are located. The visible area remains unaffected, maintaining display quality while preventing light leakage in the icon region.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If light shielding structures are added to prevent light leakage, then light leakage is reduced, but the device structure becomes more complex

Engineering Contradiction:

Improvelight leakage preventionVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The light shielding element is integrated with the touch-sensitive film assembly, and the first and second light shielding layers are combined with the backlight module and touch-sensitive film respectively. This merging approach incorporates light shielding functionality into existing structural components, minimizing additional complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The light shielding element serves multiple functions: it blocks light from entering the visible area, provides structural support within the non-visible area, and can be integrated with the touch-sensitive film assembly. This multi-functionality reduces the need for separate dedicated light shielding components.

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

This configuration effectively prevents light leakage in the visible area, enhancing product yield, competitiveness, and user experience without affecting the circuit design of the touch sensitive film.

Implementation Method 1

The second light shielding layer is located on the touch sensitive film and overlaps the light shielding element, and is configured to absorb light transmitted in the touch sensitive film and the first optical adhesive in the non-visible area

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS11782303B2Electronic device and manufacturing method with a particular light shielding structure in an icon region

Publication Date: 2023.10.10 DARWIN PRECISIONS CORP

AI summary

An electronic device includes a display module, a protection cover, a first light shielding layer, a light guide plate, a light source, a touch sensitive film, a first optical adhesive, a light shielding element, and a second light shielding layer. The first light shielding layer connects a bottom surface of the protection cover, and is configured to define a non-visible area of the electronic device. The light guide plate is located on the display module and overlaps the non-visible area. The light shielding element is located on the display module and overlaps the non-visible area. The second light shielding layer is located on the touch sensitive film and overlaps the light shielding element. The second light shielding layer is configured to absorb light transmitted in the touch sensitive film and the first optical adhesive in the non-visible area.