Pixel Opening Layout for Privacy Viewing Angle Control
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Solution Overview
Problem
Existing display devices, such as organic light emitting displays, face challenges in adjusting their viewing angle to ensure privacy by limiting visibility to only the intended user, while maintaining efficient luminous performance and lifespan.
Innovation Solution
A display device with a substrate featuring unit pixel areas, light emitting devices of different colors, and partition patterns that adjust the viewing angle by selectively covering pixel openings, ensuring equal overlap ratios and aperture ratios to maintain luminous efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If partition patterns are used to adjust viewing angle by covering pixel openings, then viewing angle control is improved, but luminous efficiency deteriorates
Solution Approach 1:
The partition patterns are selectively positioned to cover only specific portions of pixel openings rather than covering entire openings. This local coverage approach allows the display to achieve viewing angle control in specific directions while maintaining light emission efficiency in other directions, thus resolving the contradiction between viewing angle control and luminous efficiency.
2Object-affected harmful factors
If partition patterns cover pixel openings to limit visibility, then privacy protection is improved, but light emission intensity deteriorates
Solution Approach 1:
The partition patterns cover only partial areas of the pixel openings rather than completely blocking them. This partial coverage is sufficient to limit visibility from certain angles for privacy protection while allowing enough light to pass through to maintain adequate emission intensity for normal viewing.
3Adaptability or versatility
If different pixel openings have different overlap ratios with partition patterns, then viewing angle adjustment is achieved, but luminous efficiency uniformity deteriorates
Solution Approach 1:
The partition patterns are designed to provide equal overlap ratios with all pixel openings of the same color. This equipotential approach ensures that all pixels experience the same degree of coverage, maintaining uniform luminous efficiency across the display while still achieving viewing angle adjustment through the controlled partial coverage.
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 display device effectively adjusts its viewing angle to ensure privacy while maintaining equal luminous efficiency and extending the lifespan of light emitting devices by ensuring consistent aperture ratios across all pixel openings.
Implementation Method 1
first, second, and third light emitting devices disposed in each of the unit pixel areas on the substrate and emitting light of different colors
Implementation Method 2
partition patterns disposed on the first, second, and third light emitting devices and partially covering the first, second, and third pixel openings
Data Source
AI summary
A display device includes a substrate including unit pixel areas repeatedly arranged in a plan view, first, second, and third light emitting devices disposed in each of the unit pixel areas on the substrate and emitting light of different colors, a pixel defining layer defining a first pixel opening positioned above a first pixel electrode of the first light emitting device, a second pixel opening positioned above a second pixel electrode of the second light emitting device, and a third pixel opening positioned above a third electrode of the third light emitting device, partition patterns disposed on the first to third light emitting devices and partially covering the first, second, and third pixel openings, and in a plan view, the three pixel openings have the same overlap ratio. An overlap ratio is a ratio of an area of a pixel opening that is covered by the partition patterns to a total area of the pixel opening.