Rollable Display Window With Graded Thickness For Wrinkle Reduction
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Solution Overview
Problem
Flexible displays require sufficient thickness for pen functions but increased thickness limits portability and durability, and differential thicknesses cause visibility issues and wrinkles.
Innovation Solution
A rollable display device with a flexible display that includes regions of varying thicknesses, gradually decreasing with specific inclinations, allowing parts to be drawn into the device while minimizing expansion rate differences to prevent wrinkles and ensure visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the display thickness is increased to provide sufficient strength for pen functions, then the durability and pen function capability are improved, but the portability and flexibility are worsened
Solution Approach 1:
The display device implements differential thickness design where the first region (display area) has a first thickness providing sufficient strength for pen functions, while the second region (non-display area) has a second thickness that is thinner to enable flexibility and portability. This local differentiation allows each region to optimize its properties for its specific function.
2Adaptability or versatility
If the display thickness is reduced to improve portability and flexibility, then the ease of carrying is improved, but the durability and pen function capability are worsened
Solution Approach 1:
The display device implements differential thickness design where the first region (display area) has a first thickness providing sufficient strength for pen functions, while the second region (non-display area) has a second thickness that is thinner to enable flexibility and portability. This local differentiation allows each region to optimize its properties for its specific function.
3Strength
If differential thickness structure is implemented to balance strength and flexibility, then the pen function capability is improved, but visibility and appearance are worsened due to wrinkles at boundaries
Solution Approach 1:
The patent introduces a thickness dimension variation between the first region (display area with greater thickness) and the second region (non-display area with lesser thickness). This dimensional change in the thickness parameter allows the display to achieve both structural strength for pen functions and flexibility for portability, while the gradual transition minimizes visible wrinkles.
Solution Approach 2:
The patent changes the thickness parameter of the display structure, creating a differential thickness design where the display area has greater thickness for strength and the non-display area has lesser thickness for flexibility. This parameter change resolves the contradiction between structural requirements and portability requirements.
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 provides a flexible display with sufficient strength for pen functions, improved visibility, and enhanced durability by reducing wrinkles and maintaining seamless display appearance.
Implementation Method 1
the first light-emitting layer includes an organic light-emitting layer
Data Source
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AI summary
According to certain embodiments, a rollable display device comprises: a housing; a roller disposed inside the housing; and a flexible display configured to be at least partially wound on the roller, the flexible display including a pixel layer and a window, wherein the window includes: a first region having a substantially constant thickness, a second region extending from one end of the first region having a thickness that gradually decreases with a first inclination, in a direction away from the one end of the first region , and a third region extending from one end of the second region having a thickness that gradually decreases with a second inclination different from the first inclination, in a direction away from the second region, and wherein at least a portion of the second region and the third region are configured to be drawn into interior of the rollable display device when the flexible display is wound around the roller.