Buffer Layer for Display Light Shielding Stress

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Solution Overview

Problem

Existing display devices face issues with peeling or damage of the light shielding layer, which can lead to compromised image quality due to deformation of the filler by heat.

Innovation Solution

The display device incorporates a buffer layer between the light shielding layer and the filler, which helps minimize stress on the light shielding layer by buffering the deformation of the filler. Additionally, the light shielding layer and buffer layer can be formed of the same material and have the same color, with the buffer layer containing black dye.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the light shielding layer is directly disposed on the filler, then the structure is simplified, but the light shielding layer is prone to peeling or damage due to filler deformation caused by heat

Engineering Contradiction:

ImprovestructureVSAvoidlight shielding layer stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

A buffer layer is introduced between the light shielding layer and the filler to act as a mediator. This buffer layer absorbs and distributes the stress generated by thermal expansion and contraction of the filler, preventing direct stress concentration on the light shielding layer and thereby preventing peeling or damage while maintaining structural integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The buffer layer is designed with material properties that provide beforehand cushioning against thermal stress. By selecting materials with appropriate thermal expansion coefficients and mechanical properties, the buffer layer pre-compensates for the expected thermal deformation of the filler, cushioning the light shielding layer from stress before damage can occur.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If a buffer layer is added between the light shielding layer and the filler, then the light shielding layer stability is improved, but the device complexity increases

Engineering Contradiction:

Improvelight shielding layer stabilityVSAvoidstructure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The buffer layer is merged with the adhesive layer in some embodiments, where the adhesive layer itself is designed to function as a buffer layer. This integration reduces the number of separate components while maintaining the stress-absorbing function, thereby improving reliability without proportionally increasing device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The buffer layer is designed to perform multiple functions: it acts as a stress buffer, provides additional adhesion between layers, and in some cases contributes to light shielding. This multi-functionality reduces the need for separate dedicated components, balancing reliability improvement with controlled complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If the filler has high cure rate, then the manufacturing efficiency is improved, but the thermal deformation may cause image quality deterioration

Engineering Contradiction:

Improvefiller cure rateVSAvoidimage quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The buffer layer serves as an intermediary that decouples the thermal deformation of the filler from the display panel. Even when the filler deforms due to rapid curing and thermal effects, the buffer layer absorbs this deformation, preventing it from transmitting to the display panel and thereby maintaining image quality despite high cure rates.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The buffer layer's material parameters (such as elastic modulus, thermal expansion coefficient, and thickness) are optimized to change in response to thermal conditions. This allows the buffer layer to adapt its mechanical properties under different thermal states, maintaining protection against deformation-induced image quality issues while allowing rapid filler curing.

Inventive Principle:

Principle #35Parameter changes

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 minimizes peeling or damage to the light shielding layer, ensuring that image quality is maintained even when the filler is deformed by heat.

Implementation Method 1

a buffer layer between the light shielding layer and the filler... helps minimize stress on the light shielding layer by buffering the deformation of the filler

Methodology Applied

Scientific EffectStress distribution:

Implementation Method 2

the buffer layer containing black dye

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS20250194379A1Display device

Publication Date: 2025.06.12 SAMSUNG DISPLAY CO LTD

AI summary

The present disclosure relates to a display device, and more particularly, to a display device capable of minimizing peeling or damage of a light shielding layer. According to an embodiment of the disclosure, a display device comprising: a filler; a display panel on the filler; a window member on the display panel; a light shielding layer between the window member and the filler; and a buffer layer between the light shielding layer and the filler.