Tiled Assemblies for High Dynamic Range Display Panels
Solution Overview
Problem
Conventional display technologies, such as direct-lit and edge-lit panels, face challenges in achieving high dynamic range (HDR) performance while maintaining a compact form factor, with edge-lit panels suffering from reduced HDR performance due to non-uniform light intensity along the length of the light guide.
Innovation Solution
A high dynamic range panel design featuring an array of light sources illuminating corresponding light guides, where each light source is positioned within a cavity beneath an adjacent light guide, ensuring the light source does not extend below the bottom side of either guide, thereby reducing panel thickness and enhancing compactness, and utilizing multi-faceted reflective layers to direct light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If direct-lit local dimming is used to achieve high dynamic range performance, then HDR performance is improved, but panel thickness increases
Solution Approach 1:
The patent transitions from vertical stacking of light sources and liquid crystal panels (direct-lit) to a planar arrangement where edge-lit panels are positioned adjacent to each other in a side-by-side configuration. This dimensional change allows the light sources to be distributed along the edges rather than stacked vertically, achieving thinness while maintaining local dimming capability through the use of multiple independently controllable light guides arranged in a two-dimensional array.
2Length of stationary object
If edge-lit technology is used to reduce panel thickness, then compactness is improved, but HDR performance deteriorates due to non-uniform light intensity
Solution Approach 1:
The patent divides the backlight system into multiple discrete light guides arranged in an array, with each light guide being independently controllable. This segmentation allows different regions of the display to be dimmed independently, enabling local dimming functionality that restores HDR performance. The non-uniform light intensity issue is addressed by having multiple controllable zones rather than a single edge-lit structure, where each zone can be adjusted to achieve uniform overall illumination while maintaining thin profile.
3Illumination intensity
If light sources are stacked vertically to achieve local dimming, then HDR performance is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple light guides and liquid crystal panels into integrated tile assemblies that can be manufactured and assembled as modular units. Each tile assembly contains its own light guide and liquid crystal panel combination, and these tiles are arranged in a grid pattern to form the complete display. This merging approach simplifies the overall structure by creating repeating modular units rather than requiring complex vertical stacking of all components, reducing structural complexity while maintaining local dimming capability through the modular array configuration.
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 design achieves improved HDR performance and compactness by maintaining uniform light intensity and reducing thickness, allowing for the reproduction of a wide range of light intensities, thus addressing the limitations of existing technologies.
Implementation Method 1
an array of light sources illuminating a corresponding array of light guides. A light source of the array illuminates a first light guide. The light source directly underlies, such as in a cavity, a second light guide that is adjacent to the first light guide
Implementation Method 2
utilizing multi-faceted reflective layers to direct light effectively
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3E
AI summary
Techniques are provided for a high dynamic range panel that includes an array of light sources illuminating a corresponding array of light guides. A light source of the array illuminates a first light guide. The light source directly underlies, such as in a cavity, a second light guide that is adjacent to the first light guide. The light source does not extend below a bottom side of either the first light guide or the second light guide to reduce thickness of the panel. The light source and the first light guide can be integrated as a tile assembly. Alternatively, the light source and the second light guide can be an integrated tile assembly. In a specific embodiment, the light source emits a blue or ultraviolet light, which is converted by quantum dots to a different color.