Viewing Angle Switchable Display Device with Segmented Sub-Pixels
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Solution Overview
Problem
There is a need for a display device that can limit the viewing angle to enhance privacy and information protection, particularly in portable IT devices, while also reducing power consumption.
Innovation Solution
A viewing angle switchable display device is designed with a display panel comprising sub-pixels having both a first emission area and a second emission area, where the second emission area is smaller and equipped with a lens to limit the viewing angle, allowing for both wide and narrow view modes, and a low power mode by controlling the driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the viewing angle is limited to enhance privacy protection, then information security is improved, but the device complexity increases due to additional lens structures
Solution Approach 1:
The display panel is divided into multiple sub-pixels, and each sub-pixel is further segmented into a first emission area and a second emission area. The second emission area is equipped with a lens structure to limit viewing angle, while the first emission area remains without lens for wide viewing. This segmentation allows different regions to serve different privacy protection functions, resolving the contradiction between information security and device complexity by applying lens structures only where necessary.
Solution Approach 2:
Different regions of the display panel are assigned different optical properties: the first emission area has wide viewing characteristics while the second emission area has narrow viewing characteristics due to the lens. This local differentiation allows the display to provide privacy protection in specific directions while maintaining wide viewing in others, achieving information security without requiring the entire display to have complex lens structures.
2Illumination intensity
If the entire display panel is driven at high luminance, then brightness requirement is met, but power consumption increases
Solution Approach 1:
Instead of driving the entire display panel at high luminance, the patent applies high luminance driving only to the second emission area equipped with lens structures where privacy protection is needed. The first emission area can be driven at lower luminance since it does not require viewing angle limitation. This partial action approach meets the luminance requirement in critical regions while significantly reducing overall power consumption.
Solution Approach 2:
The display panel is segmented into first and second emission areas with different driving strategies. The second emission area is driven to provide required luminance for privacy-protected content, while the first emission area uses different or reduced driving parameters. This segmentation of driving approaches allows the system to meet luminance requirements where necessary while minimizing power consumption across the entire display.
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 device effectively reduces power consumption and increases the lifetime of the light-emitting diodes by selectively driving the emission areas to meet luminance requirements, achieving a wide view mode, narrow view mode, and low power mode while maintaining required luminance levels.
Implementation Method 1
a lens over the display panel and corresponding to the second emission area
Data Source
AI summary
A viewing angle switchable display device can include a display panel including a plurality of sub-pixels, where each sub-pixel has a first emission area and a second emission area. The display device can further include a lens over the display panel and corresponding to the second emission area, wherein a size of the second emission area is smaller than a size of the first emission area.