Display Base Layer Polyimide Orientation for Afterimage Reduction

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Solution Overview

Problem

Existing display apparatuses face issues with afterimages due to induced electric fields from aligned polyimide dipoles in the base layer affecting semiconductor layers, leading to brightness differences and increased manufacturing complexity.

Innovation Solution

A display apparatus with a second base layer comprising a first auxiliary base layer with polyimide in a preset orientation and a second auxiliary base layer with polyimide in an arbitrary orientation, both with different densities and thermal expansion coefficients, to prevent induced electric fields from influencing semiconductor layers, thereby reducing afterimages without additional processing steps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If polyimide in the base layer is aligned in a preset orientation to improve manufacturing simplicity, then manufacturing complexity is reduced, but induced electric fields are generated that cause afterimages and brightness differences

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidinduced electric fields causing afterimages

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The base layer is segmented into multiple auxiliary base layers (first auxiliary base layer, second auxiliary base layer, and optionally third auxiliary base layer) with different polyimide orientations. The first auxiliary base layer has polyimide in a preset orientation for easy manufacturing, while the second auxiliary base layer has polyimide in an arbitrary orientation to cancel induced electric fields, preventing afterimages.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the base layer are given different local qualities through varying polyimide orientations. The first auxiliary base layer uses preset orientation for structural integrity and ease of manufacture, while the second auxiliary base layer uses arbitrary orientation to eliminate harmful electric field effects locally where needed.

Inventive Principle:

Principle #3Local quality

2Object-generated harmful factors

If additional auxiliary base layers with different polyimide orientations are added to eliminate induced electric fields, then afterimage reduction is achieved, but device complexity increases

Engineering Contradiction:

Improveafterimage reductionVSAvoidbase layer structure complexity

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

Multiple auxiliary base layers with different polyimide orientations are merged into a single integrated base layer structure. The first, second, and optionally third auxiliary base layers are combined in one manufacturing process, allowing the cancellation of induced electric fields while avoiding the need for separate processing steps for each layer.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The polyimide orientation parameter is changed across different auxiliary base layers to achieve the desired effect. By controlling the orientation parameter (preset vs. arbitrary) in different layers, the patent eliminates induced electric fields without requiring complex additional structures or processing.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If polyimide orientation is controlled in the first auxiliary base layer to improve manufacturing, then manufacturing precision is improved, but thermal expansion differences cause visibility issues

Engineering Contradiction:

Improvepolyimide orientation controlVSAvoiddisplay brightness uniformity

Core Design Contradiction:

Manufacturing precisionVSIllumination intensity

Solution Approach 1:

The patent addresses thermal expansion differences by introducing a third auxiliary base layer with gradually changing polyimide orientation between the first and second auxiliary base layers. This gradual transition compensates for thermal expansion disparities, preventing stress concentration and maintaining display brightness uniformity while preserving manufacturing precision.

Inventive Principle:

Principle #37Thermal expansion

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 minimizes the impact of induced electric fields on semiconductor layers, enhancing display visibility and simplifying the manufacturing process by adjusting the orientation and density of polyimide layers in the second base layer.

Implementation Method 1

aligned polyimide dipoles in the base layer affecting semiconductor layers

Methodology Applied

Scientific EffectPolyimide dipole alignment: Polarisation

Implementation Method 2

induced electric fields from aligned polyimide dipoles

Methodology Applied

Scientific EffectInduced electric fields: Electric Field

Implementation Method 3

both with different densities and thermal expansion coefficients

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS20240215400A1Display apparatus and method of manufacturing the same

Publication Date: 2024.06.27 SAMSUNG DISPLAY CO LTD

AI summary

A display apparatus including a first base layer including a first auxiliary base layer and a second auxiliary base layer disposed on the first auxiliary base layer; and a semiconductor layer dispose on the first base layer. Polyimide of the first auxiliary base layer is arranged in a preset orientation, and polyimide of the second auxiliary base layer is arranged in an arbitrary orientation.