Display Substrate Light Regulation for Viewing-Angle Color Shift
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Solution Overview
Problem
OLED display substrates suffer from view angle color shift due to interference effects from the microcavity structure, leading to abnormal color perception at non-zero angles.
Innovation Solution
Incorporating a light regulation layer on the display substrate that adjusts the emergent direction of light by using negative-refractive-index materials and strategically positioned light regulation portions to control light paths and brightness ratios at various angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a microcavity structure is used in OLED display substrate, then light emission efficiency is improved, but view angle color shift occurs due to interference effects
Solution Approach 1:
A light regulation layer is introduced as an intermediary component between the OLED display substrate and the external environment. This layer uses negative-refractive-index materials to mediate the light paths, adjusting emergent light directions and compensating for the interference effects caused by the microcavity structure, thereby resolving the view angle color shift problem while preserving the high emission efficiency
2Ease of manufacture
If light regulation portions are strategically positioned, then view angle color shift is reduced, but device complexity increases
Solution Approach 1:
The light regulation layer incorporates light regulation portions with specific local properties (negative refractive index) positioned at strategic locations. These portions have locally optimized characteristics to control light paths in specific regions, achieving color perception consistency across different viewing angles without requiring complete structural redesign of the entire display device
3Ease of operation
If negative-refractive-index materials are used, then light path control is improved, but manufacturing difficulty increases
Solution Approach 1:
The invention utilizes materials with negative refractive index parameters, fundamentally changing the optical parameter regime from conventional positive refractive index materials. This parameter change enables superior light path control capabilities, allowing precise adjustment of emergent light directions to compensate for microcavity interference effects, despite the challenges in synthesizing and fabricating such advanced materials
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
Improves color purity and reduces view angle color shift by optimizing light intensity distribution, ensuring consistent color perception across different viewing angles.
Implementation Method 1
the light regulation layer is configured to adjust an emergent direction of light of at least one color emitted from the display structure layer
Data Source
AI summary
A display substrate includes an underlaying substrate, a display structure layer arranged on the underlaying substrate, and a light regulation layer arranged at a light exiting side of the display structure layer. The display structure layer includes multiple sub-pixels. An orthographic projection of the light regulation layer on the underlaying substrate does not overlap with opening regions of the multiple sub-pixels. The light regulation layer is configured to adjust an emergent direction of light of at least one color emitted from the display structure layer.