Light-Steering Layer for Uniform Backlit Display Brightness
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Solution Overview
Problem
Backlit electronic displays often exhibit non-uniform image brightness due to narrow light emission angles, resulting in brighter central regions and dimmer peripheral areas when viewed from different angles, particularly noticeable in larger displays.
Innovation Solution
The use of a light-steering layer with faceted structures, either reflective or refractive, is employed to redirect light from both central and peripheral regions of the light guide, ensuring that light is distributed uniformly across the display area, thereby eliminating 'hotspots' and dim regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light emission angle is narrowed to improve energy efficiency, then light is directed away from unused viewing angles, but image brightness becomes non-uniform with brighter center and dimmer periphery
Solution Approach 1:
The light-steering layer introduces spatially varying optical properties across the display surface. Faceted structures with different orientations at different locations (central vs peripheral regions) locally redirect light to achieve uniform perceived brightness while maintaining overall narrow emission angles for energy efficiency.
Solution Approach 2:
The patent adds a spatial dimension to light redirection by using faceted structures with varying orientations across the display surface. This dimensional variation in facet orientation enables different light steering angles from central versus peripheral regions, resolving the brightness uniformity issue without broadening the overall emission cone.
2Adaptability or versatility
If light is broadly diffused to achieve uniform brightness from various angles, then viewing angle coverage is improved, but energy efficiency decreases due to light directed toward unused vantage points
Solution Approach 1:
Different regions of the light-steering layer have locally optimized facet orientations tailored to their specific viewing requirements. Central regions use facets oriented for frontal viewing, while peripheral regions use facets oriented for oblique viewing, enabling angle-adaptive light distribution without broad diffusion.
Solution Approach 2:
The faceted structures dynamically adapt light direction based on spatial position across the display. The varying facet orientations create a dynamic light steering effect that redirects light from different source locations to appropriate viewing zones, providing angle adaptability without energy waste.
3Illumination intensity
If faceted structures are added to steer light uniformly, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The light-steering layer is implemented as a thin film or sheet containing faceted structures, adding minimal thickness and complexity to the display assembly. This thin-film approach achieves complex light steering functionality without proportionally increasing device complexity or manufacturing difficulty.
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
This solution ensures that the image appears uniformly bright to observers from various angles, enhancing the viewing experience by redirecting light to align with the viewer's perspective, thus eliminating brightness inconsistencies.
Implementation Method 1
The light-steering layer may include a series of facets configured to reflect light from a light guide
Implementation Method 2
The light-steering layer with faceted structures, either reflective or refractive, is employed to redirect light
Data Source
AI summary
Examples are disclosed that relate to backlit electronic displays that may help to avoid apparent non-uniform image brightness across a displayed image. One example provides an electronic display comprising a light guide, an image-forming layer, and a light-steering layer. The light guide is configured to release light over a display area. The image-forming layer is configured to form a display image by modulating the light released by the light guide. The light-steering layer is configured to steer together the light released from a peripheral region of the light guide and the light released from a central region of the light guide.