Lensed Pixel Display for Selective Viewing-Angle Control
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Solution Overview
Problem
Existing display devices lack the ability to selectively control the viewing angle, which is necessary for privacy protection, and suffer from limitations in lifespan, power consumption, and viewing angle cut-off performance.
Innovation Solution
A display device design that includes first and second pixels, where the first pixel has a wide viewing angle and the second pixel has a limited viewing angle, achieved through the use of lenses in the second pixel to refract light and control the viewing angle, combined with oxide thin film transistors for improved efficiency and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a display device uses conventional films to limit viewing angle, then viewing angle control is achieved, but luminance and cut-off performance are insufficient
Solution Approach 1:
The patent replaces conventional film-based viewing angle limitation mechanisms with a lens-based optical system. Each sub-pixel in the second pixel includes a lens that refracts light to control viewing angle, achieving superior luminance and cut-off performance compared to conventional films.
Solution Approach 2:
The patent changes the optical parameters by introducing lenses with specific refractive indices and curvature radii. The lens has a first curvature radius R1 and second curvature radius R2, where R1 < R2, creating an aspherical shape that optimizes light refraction for both wide viewing angle and effective cut-off performance.
2Reliability
If separate driving is performed for viewing angle control in row and column directions, then viewing angle limitation is achieved, but device complexity increases
Solution Approach 1:
The patent merges the viewing angle control function into the pixel structure itself through the lens configuration, eliminating the need for separate driving circuits for row and column directions. The first and second pixels can be driven simultaneously with independent viewing angle control achieved through their respective lens structures.
Solution Approach 2:
The lens structure serves multiple functions: it controls viewing angle, enhances luminance, and provides cut-off performance all within a single component. This multi-functionality eliminates the need for separate driving mechanisms for different viewing angle directions.
3Ease of manufacture
If oxide thin film transistors are used in high density line configurations, then manufacturing is simplified, but separate driving becomes impossible
Solution Approach 1:
The patent segments the display into first pixels with wide viewing angle and second pixels with limited viewing angle, each with independent lens structures. This segmentation allows independent control of viewing angle characteristics without requiring complex separate driving for row and column directions.
Solution Approach 2:
The patent resolves the driving complexity issue by transitioning to a spatial dimension solution - placing lenses at specific positions within pixels rather than using temporal/multiplexed driving. The lens structure physically controls viewing angle in the optical dimension, eliminating the need for complex temporal driving sequences.
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 design allows for selective control of viewing angles in both row and column directions, enhancing luminance and reducing power consumption while improving lifespan and viewing angle cut-off performance.
Implementation Method 1
each of the plurality of sub pixels of the second pixel comprising a plurality of lenses refracting light from an emitting diode
Data Source
AI summary
Provided is a display device. The display device includes a first pixel and a second pixel disposed at a display panel, the first pixel and the second pixel comprising a plurality of sub pixels respectively, and each of the plurality of sub pixels of the second pixel comprising a plurality of lenses refracting light from an emitting diode.