Rollable Display Speaker Module Sealing and Acoustic Resonance
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Solution Overview
Problem
Conventional electronic devices face challenges in increasing display size while maintaining miniaturization, leading to limitations in speaker performance due to fixed display structures and air leakage issues when using foldable or rollable displays.
Innovation Solution
An electronic device design that incorporates a sliding housing mechanism with a roller structure and sealing members to create a variable resonance space and reflex port, optimizing sound quality by adjusting the speaker signal based on the device's state and size of the resonance space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display size is increased to improve multimedia service utilization, then the display area is improved, but the device volume increases
Solution Approach 1:
The patent employs a rollable display structure that can dynamically change its effective display area. The display panel can be rolled up into a compact state for portability and unrolled to provide a large display area when needed, thus achieving both large display area and compact device volume at different usage states
Solution Approach 2:
The display panel is designed to be rolled up and stored within the device housing when not in use. This nesting mechanism allows the large display panel to be compacted into a small volume, enabling the device to maintain a compact form factor while still providing access to a large display area when required
2Area of stationary object
If a rollable display is used to increase display size, then the display area is improved, but air leakage occurs in the empty space
Solution Approach 1:
The patent uses a flexible sealing film that can dynamically adapt to the changing shape and volume of the device as the display is rolled or unrolled. This flexible sealing structure maintains the seal in the variable empty space, preventing air leakage while accommodating the rollable display's movement
Solution Approach 2:
The sealing structure is designed to be dynamic rather than static, allowing it to adjust its configuration as the display panel moves between rolled and unrolled states. This dynamic sealing mechanism maintains effective sealing throughout the entire range of motion, preventing air leakage regardless of the device's current state
3Reliability
If the empty space is sealed to prevent air leakage, then the sealing performance is improved, but the resonance space for the speaker is reduced
Solution Approach 1:
The patent creates a dynamic resonance space that changes volume as the display is rolled or unrolled. When the display is unrolled, the resonance space expands to provide excellent acoustic performance. When the display is rolled up, the resonance space contracts but remains sealed. This dynamic configuration allows the system to maintain both sealing performance and adequate resonance space at different usage states
Solution Approach 2:
The volume of the resonance space is changed as a function of the display's rolled/unrolled state. The system accepts that the resonance space volume parameter varies dynamically, allowing optimal acoustic performance when the display is unrolled while maintaining sealing integrity throughout all states
4Ease of manufacture
If the reflex port length is increased to improve low-frequency sound, then the sound quality is improved, but the device complexity increases
Solution Approach 1:
The patent employs a reflex port whose effective length changes dynamically as the display is rolled or unrolled. When the display is unrolled, the reflex port extends to provide enhanced low-frequency response. When the display is rolled up, the reflex port retracts. This dynamic configuration allows the system to achieve excellent sound quality when needed without permanently increasing device complexity
Solution Approach 2:
The reflex port structure is integrated with the rollable display mechanism, allowing the same structural movements to serve dual purposes: maintaining the seal and adjusting the reflex port length. This multi-functionality reduces overall device complexity by combining acoustic optimization with the existing display mechanism rather than adding separate complexity
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 enhances sound quality, particularly in the low-frequency band, by utilizing the empty space within the device as a resonance chamber and adjusting the reflex port length, thereby improving overall speaker performance without compromising device compactness.
Implementation Method 1
it is possible to provide an electronic device in which the empty space of the device, when disposed in the open state, may be used as a resonance space of a speaker
Data Source
AI summary
An electronic device is disclosed herein, including a first housing, a second housing configured to accommodate at least a portion of the first housing, and to guide a sliding movement of the first housing, a display including a first display region disposed on the first housing, and a second display region extending from the first display region, a speaker module disposed within the second housing, and at least one roller structure configured to seal a space between the first housing and the second housing, and to guide the sliding movement of the first housing relative to the second housing.