Touch Display Panel Layout to Reduce OLED L-Decay and Color Shift

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Solution Overview

Problem

Existing OLED panels face challenges in manufacturing complexity due to the formation of a touch control structure layer on the encapsulation layer, leading to accelerated L-Decay and color shift issues, particularly when the black matrix is far from the organic light emitting diode.

Innovation Solution

A touch display panel design where the first touch pattern layer is in contact with the black matrix, simplifying the structure and reducing the distance between the black matrix and light emitting devices, and incorporating a black single-layered structure with via holes to separate metal lines, along with a refractive index management to enhance light reflection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a touch control structure layer is arranged on the encapsulation layer, then touch control function is realized, but the distance between black matrix and light emitting devices increases causing accelerated L-Decay and color shift

Engineering Contradiction:

Improvetouch control functionVSAvoidL-Decay and color shift resistance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent combines the touch control structure layer with the black matrix structure by making the first touch pattern layer contact the black matrix directly. This merging eliminates the need for separate spacing structures and reduces the overall distance between the black matrix and light emitting devices, thereby maintaining reliability while achieving touch control functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent utilizes the vertical dimension by arranging the touch control structure layer in contact with the black matrix from the encapsulation layer side, rather than placing it horizontally separated from the black matrix. This dimensional arrangement minimizes the distance between critical components while accommodating the touch control layer.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If multiple functional layers are stacked to form a film layer structure, then touch control and display functions are integrated, but manufacturing complexity increases

Engineering Contradiction:

Improveintegrated touch control and display functionVSAvoidfilm layer structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The black matrix structure is designed to serve multiple functions: it provides light shielding, structural support, and direct contact interface for the touch control structure layer. This multi-functionality reduces the need for additional separate layers and simplifies the overall film layer structure while maintaining integrated touch control and display functions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If the black matrix is positioned far from light emitting devices, then touch control layer can be arranged, but L-Decay and color shift are accelerated

Engineering Contradiction:

Improvetouch control layer arrangementVSAvoidOLED lifespan and color stability

Core Design Contradiction:

Ease of operationVSDuration of action of stationary object

Solution Approach 1:

The first touch pattern layer acts as an intermediary that contacts the black matrix directly. This arrangement allows the touch control function to be achieved without increasing the distance between the black matrix and light emitting devices, as the touch pattern layer integrates with rather than separates from the black matrix structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design simplifies the manufacturing process, reduces L-Decay, and prevents color shift by minimizing the distance between the black matrix and light emitting devices, while maintaining effective touch control and display performance.

Implementation Method 1

a black matrix located on a light-exiting side of the display substrate

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

the first metal lines being in contact with the black matrix

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 3

a refractive index of a portion of the black matrix close to the first side sub-surface is less than that of the cover layer, so that at least part of light irradiated to the first side sub-surface from the display substrate is reflected by the first side sub-surface

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS12557536B2Touch display panel and touch display device

Publication Date: 2026.02.17 CHONGQING BOE DISPLAY TECH CO LTD

AI summary

There are provided a touch display panel and a touch display device, the touch display panel includes: a display substrate including a plurality of pixel regions and a spacer region spacing the plurality of pixel regions apart from each other; a black matrix located on a light-exiting side of the display substrate, an orthographic projection of the black matrix on the display substrate being located in the spacer region; and a touch control structure layer including a first touch pattern layer located on the light-exiting side of the display substrate, the first touch pattern layer including a plurality of first metal lines, where an orthographic projection of each first metal line on the display substrate is located in the orthographic projection of the black matrix on the display substrate, and the first metal lines are in contact with the black matrix.