Backlight Unit Reflection Structure Light Guide Plate Brightness
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Solution Overview
Problem
Conventional LCD backlight technologies suffer from low light efficiency due to scattered optical energy, which results in reduced brightness, despite efforts like Brightness Enhancement Film and Dual-Brightness Enhancement Film, which do not effectively concentrate light in the vertical direction.
Innovation Solution
A backlight unit comprising a light guide plate, a light source member, and a reflection film with a nanometer grating structure and microstructure on the light emission side, along with refractive layers and a concave mirror to collimate and direct light vertically, enhancing on-axis brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional backlight sources are used, then the device structure is simple, but optical energy is scattered and light efficiency is low
Solution Approach 1:
The light guide plate is divided into multiple refraction layers (first refraction layer, second refraction layer, third refraction layer) with different refraction indices, each layer serving to progressively control and concentrate light in the vertical direction. This segmentation allows precise optical control while maintaining a relatively simple overall structure.
Solution Approach 2:
Different regions of the light guide plate have different optical properties - the first refraction layer has higher refraction index near the light emission side, the second refraction layer has lower refraction index near the bottom side, and the third refraction layer has intermediate refraction index. This local variation in refraction indices optimizes light concentration efficiency at different depths.
2Illumination intensity
If Brightness Enhancement Film with prisms is used, then light concentration to front is improved, but optical energy is still scattered and vertical direction concentration is insufficient
Solution Approach 1:
Instead of relying solely on surface prisms for light concentration, this invention introduces vertical dimension control through multiple refraction layers with graded refraction indices. The light concentration is achieved not only in the horizontal plane (front direction) but also in the vertical dimension, creating a three-dimensional light control system that significantly improves optical energy concentration 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 solution significantly improves on-axis brightness by concentrating light vertically, increasing the brightness by controlling the light direction and refraction indices, thereby enhancing the overall light efficiency of the backlight module.
Implementation Method 1
the reflection film is at least disposed on the bottom side of the LGP and is for reflecting light back into the LGP
Implementation Method 2
the LGP comprises at least a first refraction layer, the microstructure is disposed on a side of the first refraction layer close to the light emission side
Data Source
AI summary
Embodiments of the invention disclose a backlight unit, including: a light guide plate, a light source member, a reflection film, wherein: the light guide plate (LGP) includes a light incident side, a light emission side and a bottom side opposite to the light emission side, the light guide plate is for emitting light entered from the light incident side through the light emission side; the light source member is disposed on the light incident side of the LGP and light emitted by the light source member enters the LGP through the light incident side of the LGP; the reflection film is at least disposed on the bottom side of the LGP and is for reflecting light back into the LGP; wherein a reflection structure is disposed on the bottom side of the LGP and a microstructure is disposed on the light emission side of the LGP.