Backlight Lens with Accommodation Hole for Thin Display Uniformity
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Solution Overview
Problem
Existing direct backlight modules for liquid crystal displays face challenges in maintaining uniformity of the surface light source while trying to reduce the thickness of the display, as they require a longer optical distance due to the presence of light-emitting devices and lenses, making it difficult to achieve both uniformity and thinness simultaneously.
Innovation Solution
The introduction of a light-emitting device with a second lens that includes an accommodation hole to house the light-emitting unit, allowing for coplanar arrangement and reducing the overall thickness, while maintaining proper optical coupling and uniform light distribution through the use of structures on the light-emitting surface and bottom surface for enhanced light transmission and reflection characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting devices and lenses are disposed behind liquid crystal panel in direct backlight module, then surface light source uniformity is improved, but display thickness increases due to longer optical distance required
Solution Approach 1:
The patent merges the light-emitting unit and the lens into a single integrated structure where the light-emitting unit is disposed inside the lens. This integration eliminates the need for separate disposal of these components behind the liquid crystal panel, thereby reducing the optical distance required while maintaining uniform light emission across the display surface.
Solution Approach 2:
The light-emitting unit is nested inside the lens structure, specifically disposed within the internal cavity of the lens. This nesting arrangement allows the light-emitting unit to be positioned at the optical center of the lens, optimizing light transmission and uniformity while minimizing the overall thickness of the backlight module.
2Reliability
If extra diffusion space is provided for lenses and light-emitting devices, then optical coupling is improved, but device volume increases
Solution Approach 1:
By merging the light-emitting unit and lens into one integrated component, the patent eliminates the need for additional diffusion space between these elements. The optical coupling is maintained through precise positioning of the light-emitting unit at the lens's optical center, achieving reliable light transmission without increasing the overall module volume.
Solution Approach 2:
The patent transitions from a planar arrangement where light-emitting devices and lenses are disposed separately in two dimensions, to a three-dimensional nested arrangement where the light-emitting unit is positioned inside the lens volume. This dimensional change optimizes optical coupling while minimizing the footprint and volume of the backlight module.
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 reduces the thickness of the display while ensuring uniform light emission, enabling efficient light coupling and supporting local dimming functions, thus addressing the need for thinner and more uniform backlight modules.
Implementation Method 1
The second lens includes light-emitting surface, bottom surface, side surfaces and accommodation hole. The bottom surface is disposed opposite to the light-emitting surface, and the side surfaces are respectively connected to the light-emitting surface and the bottom surface.
Implementation Method 2
The optical film is disposed on the light-emitting surfaces of the second lenses of the light-emitting devices, and the optical film is configured to receive illumination light provided by the light-emitting devices.
Data Source
AI summary
A light-emitting device including a light-emitting unit and a second lens is provided. The second lens includes light-emitting surface, bottom surface, side surfaces and accommodation hole. The bottom surface is disposed opposite to the light-emitting surface, and the side surfaces are respectively connected to the light-emitting surface and the bottom surface. The accommodation hole passes through the second lens and accommodates light-emitting unit. A light-emitting module and a backlight module are also provided.