Piezoelectric Backlight Assembly for Integrated Sound and Light
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices require separate backlight and speaker components, leading to increased complexity and cost, while also limiting integration and intelligence levels in display technology.
Innovation Solution
A backlight assembly integrated with a piezoelectric unit and reflective layer that deforms to emit sound when an audio voltage is applied, serving as both a light guide and a speaker, eliminating the need for a separate speaker and simplifying the display device structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate backlight and speaker components are used in conventional LCD devices, then the display device can provide both light and sound functions, but the device complexity and cost increase
Solution Approach 1:
The patent combines the backlight assembly and speaker into a single integrated unit. The reflective layer of the backlight assembly serves dual purposes: it reflects light to the display panel and simultaneously acts as a vibration membrane for sound emission when driven by the piezoelectric unit. This merging eliminates the need for separate speaker components while maintaining both light and sound functions.
Solution Approach 2:
The reflective layer is designed to perform multiple functions: optical reflection for display illumination and mechanical vibration for audio output. The piezoelectric unit integrated into the backlight assembly enables the same structure to function as both a light guide component and a speaker driver, achieving multi-functionality without increasing overall device complexity.
2Ease of manufacture
If separate backlight and speaker components are used, then each component can be optimized independently, but the manufacturing cost and assembly complexity increase
Solution Approach 1:
The integration of the piezoelectric unit directly into the backlight assembly structure allows for simplified manufacturing. The reflective layer is positioned adjacent to the light guide plate with the piezoelectric unit on its distal surface, creating a unified assembly that reduces the number of separate manufacturing processes and assembly steps required compared to using independent backlight and speaker components.
3Object-generated harmful factors
If the piezoelectric unit drives the reflective layer to vibrate for sound emission, then sound output is achieved, but the light exit direction may be affected
Solution Approach 1:
The air gap between the light guide plate and reflective layer is strategically designed to provide localized space for vibration while maintaining optical performance. This localized structural feature allows the reflective layer to vibrate for sound emission without significantly impacting the overall light exit direction, as the air gap confines the vibration effect to a specific region that does not interfere with the primary optical path.
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 integrated backlight assembly enhances the display device's integration level, reduces costs, and provides a more vivid display experience by combining light provision and sound emission in a single component, maintaining normal display functionality without significant impact on light exit direction.
Implementation Method 1
the piezoelectric unit is configured to undergo deformation in a direction close to the first surface and in a direction away from the first surface according to an audio voltage applied to the piezoelectric unit, and drive the reflective layer to undergo deformation to emit a sound
Data Source
AI summary
A backlight assembly, a method for manufacturing the same and a display device are provided. The backlight assembly includes: a light guide plate having a first surface and a second surface opposite to each other, a reflective layer at a position adjacent to the first surface of the light guide plate, and a piezoelectric unit on a surface of the reflective layer distal to the light guide plate. The piezoelectric unit is configured to undergo deformation in a direction close to the first surface and in a direction away from the first surface according to an audio voltage applied to the piezoelectric unit, and drive the reflective layer to undergo deformation to emit a sound.