Foldable Display Assembly With Tensioned Bend Region
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Solution Overview
Problem
Conventional flexible displays in portable information devices suffer from the occurrence of wrinkles in the bendable regions when used in a flat-plate shape, affecting visibility and appearance quality.
Innovation Solution
A display assembly design where a flexible display is fixed to two plates with a bendable region that is not adhered to the plates, applying tension in the width direction to suppress wrinkles, and a manufacturing method that involves setting the plates at an angle and applying tension to the bendable region during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display is pasted over the surfaces of a pair of right and left plates to support the back side, then the display can be supported when open in flat-plate shape, but a protruding wrinkle occurs in the bending region and visibility and appearance quality deteriorate
Solution Approach 1:
The adhesive application pattern varies by region: the first and second adhesive regions are positioned away from the bending region to avoid wrinkles, while the third adhesive region is applied only to specific areas (fourth and fifth regions) that do not interfere with bending motion. This localized adhesive strategy provides support where needed while maintaining flexibility where required.
Solution Approach 2:
The adhesive regions are divided into multiple segments: first adhesive region on the left plate, second adhesive region on the right plate, and third adhesive region on the bending region. Each segment serves a specific function - the first and second regions provide support, while the third region allows controlled bending without wrinkles.
2Adaptability or versatility
If the bending region is left free without fixation to enable bending motion, then the display can be folded, but wrinkles occur in the bending region when open in flat-plate shape
Solution Approach 1:
The third adhesive region is strategically positioned only in the fourth and fifth regions of the bending region, avoiding the central bending zone. This localized adhesive application provides minimal support to prevent wrinkles while preserving the necessary bending flexibility in the untreated areas.
Solution Approach 2:
The adhesive acts as an intermediary element that selectively bonds the display to the plates in specific regions. The third adhesive region in the bending area provides just enough attachment to prevent wrinkles while allowing the display to maintain its bending capability through the unadhered portions.
3Object-affected harmful factors
If tension is applied to the third region in width direction, then wrinkles are suppressed in the bendable region, but the dimension stretches by 0.3% to 3.3%
Solution Approach 1:
The patent applies tension to the third region in the width direction to suppress wrinkles, accepting a controlled dimensional change of 0.3% to 3.3%. This parameter adjustment transforms the bending region's physical state to eliminate wrinkles while maintaining functional flexibility.
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 suppresses wrinkles in the bendable region, enhancing visibility and appearance quality by allowing smooth folding and unfolding of the display assembly.
Implementation Method 1
in the flat plate form, a tension is applied to the third region in a width direction toward the first region and the second region
Implementation Method 2
a third region as a region between the first region and the second region, which is provided to straddle adjacent end faces of the first plate and the second plate and to be bendable without being fixed to the surfaces of the first plate and the second plate
Data Source
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AI summary
The present invention is to provide a display assembly, a portable information device, a manufacturing method of the display assembly, and a manufacturing method of the portable information device, capable of suppressing the occurrence of wrinkles in a display having a bendable region. The display assembly includes: a first plate; a second plate provided adjacent to the first plate; and a display formed into one sheet shape and having a first region fixed to the surface of the first plate, a second region fixed to the surface of the second plate, and a third region as a region between the first region and the second region, which is provided to straddle adjacent end faces of the first plate and the second plate and to be bendable without being fixed to the surfaces of the first plate and the second plate. The display assembly has a flat plate form in which the surfaces of the first plate and the second plate are lined up in a plane direction to be formed into a flat-plate shape, and a folded form in which the third region is so bent that the surface of the first plate and the surface of the second plate face each other. In the flat plate form, a tension is applied to the third region in a width direction toward the first region and the second region.