Display Light Source Mold Positioning to Prevent Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display apparatuses suffer from light leakage issues due to gaps between the substrate and the light block body, leading to erroneous recognition of adjacent light sources being turned on, even when they are off, which complicates the configuration with the need for light leakage prevention members.
Innovation Solution
The display apparatus incorporates a light source with a resin mold portion that covers the circumference of the light source body, positioning the LED mount surface closer to the display plate than the end face of the light block body, and sets the mold thickness to satisfy a specific condition (H2>√(n^2-1)×ymax) to prevent total reflection and leakage, thereby suppressing light emission towards the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light leakage prevention member such as conductive paste is inserted into the gap between the substrate and the end face of the light block body, then light leakage is prevented, but the configuration becomes complicated
Solution Approach 1:
The invention extracts the light leakage prevention function from a separate component (conductive paste) and integrates it into the mold portion of the light source package. The mold portion itself becomes the light leakage prevention element by positioning the light source body such that its bottom surface is closer to the display plate than the end face of the light block body, eliminating the need for additional light leakage prevention members.
Solution Approach 2:
The invention merges the light leakage prevention function with the mold portion structure. The mold portion serves dual purposes: protecting the light source body and preventing light leakage by positioning it closer to the display plate. This combines multiple functions into a single component, simplifying the overall configuration.
2Reliability
If the mount surface is positioned closer to the display plate than the end face of the light block body, then light leakage is suppressed, but the mold portion thickness must satisfy specific optical conditions
Solution Approach 1:
The invention specifies precise parameter ranges for the mold portion thickness (H2) based on optical principles. The thickness must satisfy the condition H2 > √(n²-1) × ymax, where n is the refractive index and ymax is the maximum radial distance. This parameter control prevents total internal reflection of light at the mold-air interface, ensuring light leakage suppression while maintaining manufacturability within defined tolerances.
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 configuration effectively prevents light leakage from the gap between the substrate and the light block body, reducing erroneous recognition and allowing for a simpler design while maintaining the advantages of using an LED package without a reflector, such as reduced size and cost.
Implementation Method 1
sets the mold thickness to satisfy a specific condition (H2>√(n^2-1)×ymax) to prevent total reflection and leakage, thereby suppressing light emission towards the substrate
Data Source
AI summary
A display apparatus includes: a substrate having a first surface; a light source that is disposed to the first surface of the substrate; a display plate that is disposed adjacent to the first surface of the substrate; and a light block body that surrounds the light source between the substrate and the display plate. The light source includes a light source body that emits light, a light source base material that has a mount surface, the light source body being mounted to the mount surface, and a mold portion that transmits the light and covers a circumference of the light source body on the mount surface of the light source base material. The mount surface is positioned closer to the display plate than an end face of the light block body, the end face being adjacent to the substrate.