Backlight Module Light Adjusting Element for Brightness
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Solution Overview
Problem
Current blue backlight modules cannot further enhance the brightness of emergent light due to white lights with large divergence angles that cannot be condensed by prism sheets.
Innovation Solution
Incorporating a light adjusting element with optical microstructures, such as cones, between the quantum dot film and optical films to guide white light with large divergence angles in a positive direction, enhancing the utilization of white light and improving brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple prism sheets are used to converge white light field, then brightness of emergent light is enhanced, but white lights with large divergence angles cannot be condensed and brightness cannot be further enhanced
Solution Approach 1:
The light adjusting element segments the white light field into different angular ranges. The first optical microstructures (cones) handle light with large divergence angles by guiding it to a predetermined direction, while the second optical microstructures (prism columns) handle light with smaller divergence angles. This segmentation allows each component to optimize for its specific angular range, resolving the contradiction between enhancing brightness and handling large divergence angles.
Solution Approach 2:
Different regions of the light adjusting element have different optical microstructure configurations tailored to specific functions. The first optical microstructures are designed with specific geometric parameters (cone angle, height) to address large divergence angles, while the second optical microstructures use prism column geometry for smaller divergence angles. This local differentiation enables the system to effectively process light across the entire angular spectrum, improving overall brightness enhancement capability.
2Illumination intensity
If conventional optical films are used, then light conversion is achieved, but light distribution and brightness are limited
Solution Approach 1:
The patent merges the functions of light guiding and light distribution into a single integrated light adjusting element. This element combines both first optical microstructures for guiding large divergence angle light and second optical microstructures for distributing light with smaller divergence angles. By merging these functions, the patent achieves improved brightness and light distribution without proportionally increasing device complexity, as the dual-function element replaces what would otherwise require multiple separate components.
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 effectively utilizes white light from the quantum dot film to enhance the brightness of emergent light from the backlight module, achieving improved light distribution and brightness.
Implementation Method 1
The quantum dot film is arranged on a transmitting path of the blue light, and adapted to convert a first portion and a second portion of the blue light into a red light and a green light, respectively
Implementation Method 2
The first surface has multiple first optical microstructures. The multiple first optical microstructures include multiple cones protruding toward the quantum dot film
Implementation Method 3
guide white light with large divergence angles in a positive direction
Data Source
AI summary
A backlight module includes a light-emitting element, a quantum dot film, an optical film and a light adjusting element. The light-emitting element is adapted to emit a blue light. The quantum dot film is adapted to converting a first portion and a second portion of the blue light into a red light and a green light, respectively. The optical film is disposed on the quantum dot film. The light adjusting element is disposed between the optical film and the quantum dot film. The light adjusting element has a first surface and a second surface respectively facing the quantum dot film and the optical film. The first surface has multiple first optical microstructures. The first optical microstructures include multiple cones protruding toward the quantum dot film. Moreover, a display apparatus including the backlight module is also provided.