Piezoelectric Sound Output Module for Display Panels
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Solution Overview
Problem
Conventional display apparatuses face challenges in directing sound output towards the viewer, resulting in degraded sound quality due to sound interference from surrounding environments and limited design flexibility due to the presence of separate speakers.
Innovation Solution
A display apparatus incorporating a sound output unit with a winding piezoelectric element attached to a support plate with an uneven surface, allowing sound to be directed towards the front surface of the display panel, enhancing sound quality and immersion by synthesizing sound frequencies and eliminating the need for separate speakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate speaker is installed in the display device, then sound output function is provided, but the speaker occupies space and limits design flexibility
Solution Approach 1:
The patent merges the speaker function with the display panel by integrating the piezoelectric element directly into the display structure. The piezoelectric element is positioned between the backlight unit and the display panel, allowing sound to be emitted from the front surface of the display panel without requiring separate speaker components, thus eliminating design constraints related to speaker placement and space occupation.
2Object-affected harmful factors
If sound is output through a separate speaker, then sound output is provided, but sound quality is degraded due to interference from sound reflected from walls or floor
Solution Approach 1:
Instead of emitting sound from the back or sides of the display device where sound would reflect off walls and floor, the patent inverts the sound emission direction by positioning the piezoelectric element to emit sound forward from the front surface of the display panel. This directional emission prevents sound from traveling to surrounding surfaces and reflecting back, thereby eliminating harmful sound interference and improving sound quality.
3Ease of operation
If a speaker is installed in the display device, then sound output function is provided, but the traveling direction of sound is toward side or upper/lower end instead of front surface
Solution Approach 1:
The patent applies local quality by positioning the piezoelectric element at a specific location within the display panel structure and orienting it to emit sound in a specific direction. The piezoelectric element is placed between the backlight unit and display panel, with its front surface facing the viewer, ensuring that sound waves are generated and propagate directly toward the front surface where the viewer is located, providing optimal sound direction control.
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 directs sound towards the viewer, improving sound quality and design aesthetics by integrating sound output within the display panel, thereby enhancing immersion and flexibility in speaker arrangement.
Implementation Method 1
a sound output unit including at least one sound output module disposed to overlap the display panel, wherein the at least one sound output module includes a support plate including an uneven surface and a piezoelectric element attached on the uneven surface of the support plate
Data Source
AI summary
A display apparatus includes a display panel, a back cover accommodating the display panel, and a sound output unit including at least one sound output module disposed to overlap the display panel. The at least one sound output module includes a support plate including an uneven surface and a piezoelectric element attached on the uneven surface of the support plate and has a shape corresponding to the uneven surface of the support plate. Accordingly, a sound having a straight characteristic within an audible frequency domain may be output, thereby enhancing a sense of reality and an immersion of a viewer watching an image displayed by the display apparatus.