Display Panel Vibration Generator for Front-Facing Sound and Contrast Control
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Solution Overview
Problem
Current transparent display apparatuses face challenges with contrast ratio reduction in ambient light due to the slow response time of electrochromic devices used for light control, and they often require separate speakers that obstruct design and space, failing to direct sound towards the viewer effectively.
Innovation Solution
A display apparatus with a light-controlling device that includes a transmission controller and a vibration generator overlapping the emissive area, allowing independent control for light transmission and blocking modes, and sound output towards the viewer, integrated into the display panel's rear surface to enhance immersion and design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an electrochromic device is used as a light-controlling device in a transparent display apparatus, then the light transmission mode can be changed to light-blocking mode with low driving voltage, but a long time is taken in changing modes due to slow response time
Solution Approach 1:
The light-controlling device is divided into multiple independent light-controlling regions, each with its own electrochromic layer and control electrodes. This segmentation allows different regions to be controlled independently and simultaneously, enabling parallel operation that reduces the overall response time while maintaining low driving voltage requirements.
2Object-generated harmful factors
If a separate speaker is installed in a display apparatus, then sound can be output, but the traveling direction of sound is toward side or upper/lower portions instead of toward the front or rear, hindering immersion experience
Solution Approach 1:
The vibration generator is integrated with the display panel structure, specifically positioned at the rear surface and overlapping with the emissive area. This merging allows the display panel itself to serve as the sound output medium, enabling sound waves to propagate directly toward the front or rear where viewers are positioned, thereby enhancing the immersion experience.
Solution Approach 2:
The vibration generator is positioned on the rear surface of the display panel, utilizing the z-dimension (depth) rather than occupying lateral space. This dimensional repositioning allows sound to be generated from the back of the panel and directed forward through the panel material, changing the sound propagation direction from side/upper-lower portions to front/rear directions.
3Object-generated harmful factors
If a vibration generating device is disposed on the rear surface of a display apparatus to output sound toward the front, then sound direction is improved, but the vibration generating device becomes visible through the transparent display
Solution Approach 1:
The vibration generator is positioned to overlap specifically with the emissive area of the display panel, where light is actively emitted. This local positioning ensures that the vibration generator is obscured by the emitted light, making it invisible to viewers while still enabling effective sound output toward the front or rear directions.
4Object-generated harmful factors
If a vibration generating device is added to a thin film type display apparatus, then sound can be output toward the front, but the size of the device increases making it difficult to implement thin film type
Solution Approach 1:
The vibration generator is designed to serve dual functions: it acts as both a light-controlling element and a sound-generating element. By integrating these two functions into a single component positioned on the rear surface, the need for separate dedicated vibration generation structures is eliminated, allowing thin film type display apparatus to maintain their thin profile while achieving effective sound output.
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 enables improved contrast ratio management in various lighting conditions and directs sound towards the viewer, enhancing immersion and design freedom without increasing the display's size or visibility of the vibration device.
Implementation Method 1
a separate vibration generating device that vibrates a display panel to output sound toward a forward region in front of the display panel
Implementation Method 2
technology for using an electrochromic device as a light-controlling device. The electrochromic device may perform the light transmission mode of transmitting light in a state in which a voltage is not applied thereto, and may change the light transmission mode to the light-blocking mode with a low driving voltage
Data Source
AI summary
A display apparatus includes: a display panel including: a transmissive area configured to transmit light incident thereon, and an emissive area configured to emit light, a light-controlling device on a rear surface of the display panel, the light-controlling device being configured to have a light transmission mode for transmitting the incident light and a light-blocking mode for blocking the incident light, the light-controlling device including: a first substrate and a second substrate facing each other, a transmission controller between the first substrate and the second substrate, the transmission controller overlapping the transmissive area, and a vibration generator between the first substrate and the second substrate, the vibration generator overlapping the emissive area.