Selective Light Redirecting Layer for Uniform Display Color
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Solution Overview
Problem
Electronic devices with displays, such as LCDs and OLEDs, often suffer from lower than desired efficiency and non-uniformities between different colors at certain viewing angles.
Innovation Solution
Incorporating a light redirecting layer, such as a geometric phase lens, between the display panel and the lens assembly to optimize light redirection based on the properties of the lens assembly, with varying redirection angles across the layer to ensure uniform color perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a light redirecting layer is added to improve viewing angle uniformity, then color perception uniformity is improved, but device complexity increases
Solution Approach 1:
A light redirecting layer is introduced as an intermediary component between the display panel and the viewer. This layer selectively redirects light rays at different angles, with the redirection angle increasing with distance from the center, to compensate for viewing angle-dependent color shifts and achieve uniform color perception across different viewing angles.
Solution Approach 2:
The light redirecting layer implements spatially varying light redirection properties across its surface. The redirection angle is not uniform but increases with distance from the center of the layer, creating local variations in optical properties that collectively achieve global color uniformity across the display.
2Reliability
If a light redirecting layer is added to mitigate viewing angle artifacts, then display performance is improved, but the display bulk increases
Solution Approach 1:
The light redirecting layer is implemented as a thin film structure that can be integrated into the existing display stack. This thin film approach provides the necessary light redirection functionality while minimizing the additional bulk added to the display assembly.
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 light redirecting layer enhances display performance by mitigating viewing angle color shifts and other artifacts, resulting in more uniform color perception across the display without adding excess bulk.
Implementation Method 1
The light redirecting layer may redirect light by different amounts at different portions of the light redirecting layer, depending on the properties of the lens assembly
Implementation Method 2
The light redirecting layer may be a geometric phase lens formed using a liquid crystal film
Implementation Method 3
The light redirecting layer may be a geometric phase lens formed using a liquid crystal film
Implementation Method 4
The display may also include a circular polarizer, an additional circular polarizer, and an additional quarter waveplate
Data Source
AI summary
A display may include a display panel that emits light. The light from the display panel may be focused by a lens assembly towards a viewer. A light redirecting layer may be included in the display between the display panel and the lens assembly to ensure that the lens assembly receives incident light at an optimal angle. The light redirecting layer may redirect light by different amounts at different portions of the light redirecting layer. The magnitude of the redirection angle may increase with increasing separation from the center of the light redirecting layer. The light redirecting layer may redirect light away from the center of the light redirecting layer. The light redirecting layer may be a geometric phase lens formed using a liquid crystal film. The display may also include a circular polarizer, an additional circular polarizer, and an additional quarter waveplate.