Multilayer Display Switching for Viewing-Angle Privacy
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Solution Overview
Problem
Existing electronic devices, particularly display devices, lack effective privacy screening capabilities, compromising user privacy when viewing sensitive information.
Innovation Solution
The display device incorporates a light emitting layer with adjustable backlight units and a light adjusting layer that controls backlight intensity and direction, allowing for selective viewing angles and privacy control through individual control of backlight brightness and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a display device is designed with conventional structure, then the device can display information, but the privacy screen function is insufficient and user privacy is compromised
Solution Approach 1:
The display device is divided into multiple independent pixel units, each with its own switching component and light emitting element. This segmentation allows individual control of each pixel's light emission, enabling privacy screen functionality where only specific pixels are activated based on viewer position, thus improving privacy protection without requiring a completely different display architecture
Solution Approach 2:
The display device employs dynamic control of light emitting elements through switching components that can be turned on or off based on detected viewer position. The light emitting layer dynamically adjusts which pixels are active, changing the display state from static to dynamic, thereby achieving privacy screen function that adapts to different viewing scenarios
2Manufacturing precision
If multiple switching components are arranged close together to improve pixel density, then the viewing angle control becomes difficult, but increasing the distance between switching components reduces pixel density
Solution Approach 1:
The patent extracts the viewing angle control function from the pixel structure itself and places it in a separate light adjusting layer positioned after the pixel electrodes. This separation allows high pixel density through close spacing of switching components while the viewing angle control is achieved through a distinct optical layer that can be independently designed and positioned, resolving the conflict between density and control
Solution Approach 2:
A light adjusting layer is introduced as an intermediary component between the pixel electrodes and the viewer. This intermediate layer contains light adjusting elements that can be independently controlled to direct light from multiple closely-spaced pixels to specific viewing angles. The intermediary layer enables both high pixel density and effective viewing angle control by mediating between the dense pixel array and the viewing requirements
3Reliability
If a light adjusting layer is added to control viewing angles and privacy, then privacy protection is improved, but the device structure and manufacturing complexity increase
Solution Approach 1:
The light adjusting elements are integrated into a layer that can be formed using the same or similar fabrication processes as the pixel electrodes, merging the privacy control function with the existing display manufacturing workflow. By combining the light adjusting layer with the pixel structure formation processes, the patent reduces the incremental manufacturing complexity that would otherwise result from adding a completely separate privacy control system
Data Source
AI summary
An electronic device has a viewing side and includes a first substrate, a second substrate, two adjacent first switching components, a third substrate and two adjacent second switching components. The second substrate is overlapped with the first substrate along a first direction. The first switching components are disposed between the first substrate and the second substrate, wherein the first switching components are separated by a first distance along a second direction different from the first direction. The third substrate is overlapped with the second substrate along the first direction. The second switching components are disposed between the second substrate and the third substrate, wherein the second switching components are closer to the viewing side than the first switching components, the second switching components are separated by a second distance along the second direction, and the second distance is greater than the first distance.