Display Panel Prism Structure for Halo-Free LED Light Extraction
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Solution Overview
Problem
Display panels using light emitting diodes (LEDs) suffer from halos due to limitations in light pattern distribution, leading to reduced display quality and efficiency.
Innovation Solution
Incorporation of prism structures on the display panel, with sub-structures having inclined surfaces that refract light, adjusting emission paths and incidence angles to prevent total reflection and enhance light emission, thereby avoiding halos and improving display efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light emitting diodes are used for display, then power consumption is reduced and service life is extended, but halos are generated due to light pattern distribution limitations
Solution Approach 1:
The patent introduces a light modulating layer as an intermediary component between the LED light source and the display surface. This layer contains microlens arrays and light blocking patterns that actively manipulate light distribution, refracting escaped light back toward the display surface and blocking light at critical angles to prevent halo formation while maintaining LED energy efficiency
Solution Approach 2:
The patent modifies the optical parameters of light propagation by using microlens arrays with specific focal lengths and light blocking patterns with varying densities. By changing the refractive index distribution and light path parameters through these structured elements, the system controls light emission angles and intensities to eliminate halos while preserving LED power advantages
2Device complexity
If conventional light emitting elements are used, then device structure is simple, but light emission efficiency is reduced due to total reflection and halo formation
Solution Approach 1:
The light modulating layer is segmented into multiple functional zones: microlens arrays for light refraction, light blocking patterns for angle control, and reflective layers for light redirection. This segmentation allows each component to perform its specific function optimally, collectively improving light emission efficiency without requiring complete structural redesign
Solution Approach 2:
The patent addresses light propagation issues by introducing a vertical dimension of control through the light modulating layer positioned above the LED. This layered approach adds optical control functionality in the vertical direction, enabling precise manipulation of light paths and emission angles to prevent total reflection and enhance efficiency
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 prism structures effectively reduce halo formation, increase the amount of emitted light, and enhance the display effect by optimizing light emission paths and angles, leading to improved display quality and efficiency.
Implementation Method 1
The light emitted from the light emitting element is refracted at the first inclined surface of the sub-structure of the prism structure when the light is irradiated onto the sub-structure, changing an emission path of the light emitting element
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a substrate, multiple light emitting elements, and multiple prism structures. The prism structure includes multiple sub-structures. An orthographic projection of the sub-structure on the substrate at least partially surrounds that of the light emitting element on the substrate. The sub-structure has a first inclined surface toward the light emitting element, and the sub-structures include a first sub-structure and a second sub-structure. In a first direction, the first sub-structure and the second sub-structure have different distances from the light emitting element, and have different included angles between first inclined surfaces of the sub-structures and a direction perpendicular to a plane in which the substrate is located. The first direction is parallel to a plane in which the substrate is located.