Display Screen Vibration Transmission via Backplane Exciter
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Solution Overview
Problem
Existing display apparatuses face challenges in achieving sound on display technology due to the inability of liquid crystal display (LCD) devices to transmit vibration through the air layer between components, resulting in poor sound quality and misalignment of sound position with the image.
Innovation Solution
A display apparatus is designed with a screen, a backplane, and an exciter. The exciter is connected to the backplane, which is in turn connected to the non-display area of the screen. This configuration allows the exciter to drive the screen to vibrate, producing sound, with the sound pressure level enhanced and the sound position aligned closer to the image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LCD display devices use an air layer between components, then the display structure is simple and easy to manufacture, but the vibration cannot be transmitted through the air layer resulting in poor sound quality
Solution Approach 1:
The patent introduces a vibration transmission component as an intermediary between the exciter and the screen. This component bridges the air layer gap, enabling effective vibration transmission from the exciter to the screen while maintaining the air layer structure for ease of manufacture. The intermediary resolves the contradiction by providing mechanical coupling without eliminating the air layer design.
2Power
If sound is output from a separate speaker position, then the sound pressure level can be sufficient, but the sound position is misaligned with the image display area
Solution Approach 1:
The patent merges the sound output function with the screen structure by making the screen itself the vibration element. The exciter drives the screen to vibrate, producing sound directly from the display area. This integration eliminates the need for separate speakers, ensuring sound position alignment with the image while maintaining sufficient sound pressure level through the large surface area of the screen.
3Strength
If the backplane is made rigid for structural strength, then the structural stability is good, but the vibration transmission efficiency decreases reducing sound quality
Solution Approach 1:
The patent applies local quality by differentiating the backplane into regions with different mechanical properties. The backplane is designed to be rigid in areas requiring structural support while having enhanced vibration transmission characteristics in areas coupled with the exciter and screen. This localized differentiation allows the backplane to simultaneously provide structural stability and efficient vibration transmission.
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 proposed solution enables the display apparatus to produce sound with a higher sound pressure level and improved alignment with the image, enhancing the overall sound quality and user experience.
Implementation Method 1
the exciter is configured to drive the screen to vibrate and output sound via the backplane
Implementation Method 2
vibration of the vibration element is configured to be transmitted to the backplane and drive the non-display area to vibrate
Implementation Method 3
the vibration portion is configured to deform along with vibration of the vibration element and undergo a reciprocating movement with respect to the backplane body
Implementation Method 4
a damper disposed between the backplane and the exciter to increase damping of the vibration portion
Implementation Method 5
the buffer element is disposed between the vibration portion and the non-display area and is capable of deforming under the drive of the vibration portion
Data Source
AI summary
A display apparatus is provided in the present disclosure. The display apparatus includes: a screen, including a display area and a non-display area; a backplane, in connection with the screen; and an exciter, in connection with the backplane and is configured to drive the screen to vibrate and output sound via the backplane.