Backlight Optical Member Rod Lenses Light Efficiency
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Solution Overview
Problem
Non-emissive display apparatuses, such as liquid crystal displays, face inefficiencies in light distribution due to hot spots and limited view angles, which affect color reproducibility and power consumption.
Innovation Solution
Incorporating a backlight unit with a light guide part, a light source part featuring alternating first and second light emitting device packages, and an optical member with rod-type lenses on at least one of the packages, where the optical member adjusts the view angle of light emitted from the packages to improve light efficiency and reduce hot spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple optical sheets are added to improve light efficiency, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple optical functions into a single integrated optical member. The optical member includes a lens array portion with multiple rod-type lenses and a reflector portion with reflective surfaces, merging light guiding, light reflecting, and light diffusing functions that would traditionally require separate optical sheets. This reduces the number of components while maintaining light efficiency.
Solution Approach 2:
The optical member serves multiple functions simultaneously: the rod-type lenses guide and diffuse light, the reflective surfaces redirect light, and the integrated structure provides both light collection and light distribution. This multi-functional design eliminates the need for separate optical sheets for each function.
2Illumination intensity
If light emitting device packages are used to improve color reproducibility, then color reproducibility is improved, but hot spots occur due to limited view angle
Solution Approach 1:
The patent applies different optical properties to different regions of the optical member. The rod-type lenses have specific aspect ratios (height-to-width ratio) that vary by region, and the reflective surfaces have different orientations in different areas. This local variation in optical properties ensures uniform light distribution across the display panel, preventing hot spots while maintaining color reproducibility.
Solution Approach 2:
The patent transitions from point-source lighting to distributed lighting by using an array of rod-type lenses. Each lens redirects light from the light emitting device packages in a specific direction, creating a three-dimensional light distribution pattern that covers the entire display area uniformly, thereby eliminating hot spots.
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 enhances light incident into the light guide part, improving color reproducibility and reducing power consumption by uniformly distributing light across the display panel, thereby addressing inefficiencies in existing display technologies.
Implementation Method 1
an optical member disposed on at least one light emitting device package of the first and second light emitting device packages, where the optical member includes a plurality of rod-type lenses
Implementation Method 2
a reflection surface facing the light emission surface
Data Source
AI summary
A display apparatus includes a display panel and a backlight unit which provides light to the display panel. The backlight unit includes a light guide part, a light source part facing a light incident surface of the light guide part and including a circuit board, a first light emitting device package disposed on the circuit board, and a second light emitting device package disposed on the circuit board and which generates light having a wavelength different from that of light generated by the first light emitting device package, and an optical member disposed on at least one light emitting device package of the first and second light emitting device packages and including a plurality of rod-type lenses.