Light Control Layer Surface Structure for Uniform Display Luminance
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Solution Overview
Problem
Conventional light emitting apparatuses face challenges in controlling thickness uniformity and luminance due to difficulties in surface leveling of the molding material, leading to low controllability of light emission and luminance degradation.
Innovation Solution
A light emitting apparatus featuring a light control layer with controlled surface roughness, including protrusions with a height difference of 40 μm or less, to enhance light extraction efficiency and prevent color mixing, while improving luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light emitting diodes are disposed as light sources at the backside of the display panel and covered with a molding material, then light can spread to the display panel, but thickness uniformity of the molding material cannot be controlled properly
Solution Approach 1:
The patent applies curvature by forming a convex curved surface on the light control layer. This curved structure redirects light that would otherwise be blocked by the uneven molding material surface, improving light extraction efficiency and uniformity without requiring perfect thickness control of the molding material.
Solution Approach 2:
The patent introduces a light control layer with specific optical properties (different refractive index) at the interface between the molding material and display panel. This localized modification addresses the light control issue specifically at the problematic interface region without changing the entire molding material structure.
2Illumination intensity
If a typical light emitting apparatus uses a molding material covering the light emitting diodes, then light can be emitted, but surface leveling cannot be properly controlled leading to luminance deterioration
Solution Approach 1:
The convex curved surface on the light control layer compensates for surface leveling issues by creating a controlled optical interface. This curvature ensures that light from LEDs at different heights can all be effectively extracted, maintaining luminance uniformity despite variations in molding material surface level.
Solution Approach 2:
The light control layer acts as an intermediary between the molding material and the display panel. It provides a controlled optical interface that mediates the interaction between light and the display panel, ensuring consistent light extraction regardless of molding material surface variations.
3Illumination intensity
If the molding material thickness is not uniformly controlled, then light emission occurs, but controllability with respect to light is reduced
Solution Approach 1:
The light control layer with specific optical properties is introduced at the critical interface region to provide localized control over light behavior. This allows independent optimization of light extraction in this region without being constrained by the overall molding material thickness variations.
Solution Approach 2:
The convex curved surface structure provides geometric control over light paths. By designing the curvature radius and shape parameters, the light extraction efficiency and angular distribution can be controlled independently of the molding material thickness, enhancing light controllability.
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 solution provides high controllability of light emission, prevents color mixing, and maximizes luminance by ensuring uniform light emission and surface leveling, resulting in improved luminance uniformity and visibility in display apparatuses.
Implementation Method 1
a first light control layer allowing light transmission therethrough and covering the light emitting device, wherein the first light control layer has at least one protrusion formed in at least some region on an upper surface thereof
Data Source
AI summary
A light emitting apparatus includes at least one light emitting device and a first light control layer allowing light transmission therethrough and covering the light emitting device, the first light control layer has at least one protrusion formed in at least some region on an upper surface thereof and a height difference G1 between a maximum height and a minimum height of the at least one protrusion is 40 μm or less. A display apparatus includes a substrate, at least one light emitting device disposed on one surface of the substrate, and a first light control layer covering at least part of the light emitting device.