Flexible Touch Control Display Screen Integrated with OLED

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Solution Overview

Problem

Conventional touch control screens for flexible OLED displays lack the necessary flexibility and require an additional bonding step, increasing the thickness of the display module.

Innovation Solution

A method for manufacturing a flexible touch control display screen involves depositing a metal bridge and inorganic layer on a film encapsulation layer, forming recesses and contact holes, and integrating touch control electrodes within the inorganic layer to create a metallic grid, which reduces stress and eliminates the need for a separate bonding step.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional touch control screens are manufactured independently and then adhered to OLED screens via optical transparent adhesive, then the touch control function is achieved, but the module thickness increases and flexibility is reduced

Engineering Contradiction:

Improvetouch control functionVSAvoidmodule thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The patent merges the touch control layer with the OLED display layer by forming the transparent conductive layer directly on the OLED structure during the same manufacturing process. This integration eliminates the need for separate bonding of independently manufactured touch control screens, thereby reducing overall module thickness while maintaining touch control functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The transparent conductive layer is formed preliminarily during the OLED manufacturing process before the display module is completed. By preparing the touch control structure in advance as part of the OLED fabrication sequence, the patent avoids subsequent bonding steps that would increase thickness and compromise flexibility.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If conventional touch control screens are adhered to OLED screens via optical transparent adhesive, then the touch control function is achieved, but the flexibility and pliability of the display screen are reduced

Engineering Contradiction:

Improvetouch control functionVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

By combining the touch control layer formation with the OLED manufacturing process, the patent creates an integrated structure where the transparent conductive layer becomes an intrinsic part of the flexible OLED assembly. This merger eliminates rigid bonding interfaces that would restrict bending and flexibility.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent changes the manufacturing parameters and process sequence by forming the transparent conductive layer during OLED fabrication rather than as a separate post-processing step. This parameter change enables the use of flexible substrates and maintains the pliability required for flexible display applications.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If transparent conductive film is used for touch control screen, then the touch control function is achieved, but the desired flexibility requirement cannot be met

Engineering Contradiction:

Improvetouch control functionVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent changes the material and structural parameters by using a transparent conductive oxide layer (such as ITO or IZO) deposited directly on the flexible OLED structure. This material selection and deposition approach maintains optical transparency and electrical conductivity while adapting to the flexible substrate's mechanical properties, achieving both touch control function and flexibility.

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 approach enhances the flexibility of the touch control display screen, prevents module breakage under bending, and reduces the overall thickness by integrating the touch control electrodes directly into the inorganic layer.

Implementation Method 1

a step S20 of depositing a first metal layer on a film encapsulation layer

Methodology Applied

Scientific EffectPhysical Vapour Deposition: Physical Vapour Deposition

Implementation Method 2

a step S30 of depositing a first inorganic layer on a surface of the metal bridge

Methodology Applied

Scientific EffectPhysical Vapour Deposition: Physical Vapour Deposition

Implementation Method 3

a step S50 of depositing a second metal layer on a surface of the first inorganic layer

Methodology Applied

Scientific EffectPhysical Vapour Deposition: Physical Vapour Deposition

Data Source

PatentUS10916600B2Flexible touch control display screen and method for manufacturing same

Publication Date: 2021.02.09 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

The present disclosure provides a flexible touch control display screen and a method for manufacturing same. The flexible touch control display screen includes a flexible substrate, a TFT layer, an OLED display layer, and a film encapsulation layer. A metal bridge, a first inorganic layer, a second metal layer, and a protective layer are sequentially formed on the film encapsulation layer. The first inorganic layer includes a plurality of channels formed by patterning the first inorganic layer, as well as a touch control sensing electrode and a touch control driving electrode disposed thereon.