Switchable Diffuser and Backlight Module for Full-Screen Display
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Solution Overview
Problem
Existing display devices face difficulties in achieving full-screen display due to the design of front lens modules, which sacrifice display area and create challenges in module design.
Innovation Solution
A display device with a backlight module having a reflector and multiple optical layers, where the reflector has non-reflecting and reflecting portions, and a switchable diffuser is used between the display panel and the backlight module, allowing for partitioned structures in the optical layers to facilitate image acquisition and improve light uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a slot is formed on the front surface of the screen to accommodate the front lens module, then the optical sensor can be disposed, but the display area is reduced and full-screen display cannot be achieved
Solution Approach 1:
The patent moves the optical sensor from the front surface (2D plane) to the rear surface of the display panel, changing the spatial dimension where the sensor is located. This allows the front surface to be fully dedicated to display purposes while the sensor is accommodated on the back side, achieving full-screen display without compromising optical sensing capability
Solution Approach 2:
The patent embeds the optical sensor within the thickness of the display panel structure, specifically positioning it on the rear surface within the panel assembly. This nesting approach allows the sensor to be integrated into the existing structural depth without requiring additional external space that would compromise the full-screen display
2Adaptability or versatility
If the backlight module has different structures in the first region and second region to accommodate the optical sensor, then image acquisition is enabled, but visual uniformity between regions is compromised
Solution Approach 1:
The patent applies different structural characteristics to different regions of the backlight module: the first region (with optical sensor) has a first structure optimized for light transmission to the sensor, while the second region has a second structure optimized for uniform light distribution. Each region's structure is locally optimized for its specific function rather than using a uniform structure throughout
Solution Approach 2:
The patent introduces a light-shielding structure as an intermediary element between the backlight module and the display panel. This intermediary component blocks light from the first region from directly affecting the second region's visual appearance, thereby maintaining visual uniformity across the display while still allowing the optical sensor to function in the first region
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
Enables full-screen display while maintaining good display quality by allowing the optical sensor to receive light and reducing visual differences between regions with different optical layer structures, thus achieving both full-screen functionality and improved image quality.
Implementation Method 1
the switchable diffuser is used to shield the optical sensor disposed corresponding to the first region, or to improve the disuniformity of light beam at the junction of the first region and the second region
Implementation Method 2
The reflector has a non-reflecting portion in the first region and a reflecting portion in the second region
Data Source
AI summary
A display device and a mobile device are provided. The display device includes a display panel, a backlight module, and a switchable diffuser. The backlight module has a first region and a second region. The backlight module includes a reflector and optical layers. The reflector includes a non-reflecting portion in the first region and a reflecting portion in the second region. The optical layers are disposed on the reflector. The switchable diffuser is disposed between the display panel and the backlight module. At least one of the optical layers includes different structures in the first region and the second region.