The design of the folding screen mobile phone case should take into account the three cores of structural adaptability, protection and ease of use, and optimize the details for the forms such as internal folding/external folding, vertical folding/horizontal folding, etc.
1. Core Design Objectives
The core pain points of folding screen are fragile hinge, fragile screen and increased thickness after folding. The design needs to focus on: adapting the folding form without hindering the opening and closing; Strengthen the screen edge, hinge and four corner protection; Balance protection and experience, control thickness and weight, and do not affect basic functions.
2. design by fold type
1. Inner folding folding screen (such as Samsung Z Fold, Huawei Mate X)
The main screen is folded inside, the outer screen is a secondary screen, and the hinge is protruding and easy to enter gray. The design needs to adopt a segmented shell, and the front and rear covers are connected by a flexible structure. The hinge protective cover is made of TPU + hard PC composite material, with a 0.3-0.5mm heat dissipation and anti-dust gap reserved to support 120 + opening and closing. The inner screen is not directly covered, and is indirectly protected by a 0.5-1mm protrusion on the edge of the outer screen. The back plate is made of glass fiber reinforced PC or aramid fiber, and the frame with high elastic TPU, with an overall weight of 30-50g.
2. External folding/vertical folding screen (such as Motorola Razr, Samsung Z Flip)
The screen is folded outside or vertically in a "flip" shape, with a thin and light body and hidden hinges. It is necessary to make full-wrapped flexible bonding, and the frame of the vertical folding model is made of ultra-soft TPU with Shore hardness of 60-70A; The outer folding model adopts the integrated design of ultra-thin tempered glass composite film and shell, or the magnetic attraction/snap-in detachable outer screen cover; The shaft part is hollowed out or curved transition, and the gap after folding is ≤ 0.2mm.
3. core details optimization
1. Material selection
Hard materials (PC, glass fiber reinforced materials) are used for the back plate and hinge hard shell, and the surface is frosted to prevent skid. Soft materials (highly elastic TPU, liquid silicone) are used for borders and connecting parts, and airbag structures can be set at the four corners. The inner lining is made of microfiber cloth or flocking to avoid scratching the fuselage.
2. Protective strengthening
TPU airbag cushion is set at the four corners, and the frame is 0.5-1mm higher than the screen/camera; The back plate is reinforced with honeycomb ribs; Soft TPU lip seal structure is designed at the hinge to prevent dust. The camera area is raised 0.8-1.2mm, with high hardness PC with Mohs hardness ≥ 3.
3. Convenience and function
After folding, the thickness increases by ≤ 5mm (internal folding) or ≤ 3mm (vertical folding); Precisely reserve the interface, and the wireless charger avoids metal blocking the coil; The rounded corner of the hinge is anti-jamming, and the internal folding model can be supplemented with a slight spring structure to assist rebound. Additional magnetic adaptation, hidden bracket (110-130), personalized design through IMD/IML process.
4. test verification
It is necessary to pass more than 10000 folding life tests to check the state of the shell. 1.2m height drop test to verify the protection effect; Compatibility test ensures that touch control, camera shooting, signal and wireless charging are not affected (loss ≤ 10%).
The core of the folding screen mobile phone case is the adaptive form and precise protection. It needs to balance the structure, material and function, and take into account the light and thin, hand feeling and personalization, so as to realize the unity of protection and experience.