Backlight Module Recessed Mixed Light Apparatus
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Solution Overview
Problem
Conventional direct-type backlight modules for LCDs face issues with poor light mixing due to reduced distance between the light source and diffusion plate, resulting in yellowish-blue light emission, low energy, and unadjustable color saturation, especially in compact applications.
Innovation Solution
A backlight module design incorporating a light guide plate with recesses and a mixed light apparatus featuring light reflecting elements and focal points for LEDs, which mixes red, green, and blue light to produce white light with high color saturation and uniformity, using a transparent material like glass or PMMA with reflective surfaces for efficient light redirection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between light source and diffusion plate is shortened to achieve compact LCD design, then device size is reduced, but light mixing quality deteriorates producing yellowish-blue light instead of white light
Solution Approach 1:
A light mixing component is introduced as an intermediary element between the light source and diffusion plate. This component receives light from the light source and redirects it through reflective surfaces to achieve proper mixing before reaching the diffusion plate, allowing short distance while maintaining mixing quality
Solution Approach 2:
The light mixing process is extended into the vertical dimension by using reflective surfaces that redirect light at angles. This allows the light to traverse a longer path within a compact horizontal space, achieving effective mixing without increasing the overall module thickness
2Illumination intensity
If multiple red, green and blue LEDs are used to achieve high illumination, then light intensity is improved, but color saturation and energy efficiency deteriorate
Solution Approach 1:
The patent changes the spectral parameters by using a light source that emits light closer to the ideal white spectrum. This allows achieving high illumination with better color saturation and energy efficiency by selecting appropriate LED wavelengths and ratios rather than using equal amounts of red, green and blue LEDs
3Illumination intensity
If conventional direct-type backlight module is used to provide high illumination, then light output is improved, but color adjustability and uniformity deteriorate
Solution Approach 1:
The light mixing component incorporates adjustable elements that allow dynamic control of color output. By adjusting the position or properties of reflective surfaces or light guiding elements, the color temperature and saturation can be tuned while maintaining high illumination levels
Solution Approach 2:
Different regions of the light mixing component have different reflective properties or light guiding characteristics. This local differentiation allows different portions of the light output to have different color characteristics, enabling overall color adjustment and improved uniformity across the display area
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 achieves high color saturation, improved light uniformity, and increased energy efficiency in white light emission, allowing for adjustable color output suitable for compact applications.
Implementation Method 1
a mixed light apparatus 42...configured for mixing the light emitted from the first light source 43 and the second light source 44
Implementation Method 2
The light guide plate 41 includes a body 411...at least one recess 412...The mixed light apparatus 42 is disposed at least partly in or adjacent to the recess 412
Implementation Method 3
using a transparent material like glass or PMMA with reflective surfaces for efficient light redirection
Data Source
AI summary
A backlight module includes a light guide plate, at least one mixed light apparatus, a first light source and a second light source. The light guide plate includes a body including at least one recess provided at a bottom surface thereof. The mixed light apparatus is disposed partly in or adjacent to the recess. The mixed light apparatus includes a body, a first light reflecting element and a second light reflecting element. The body of the mixed light apparatus has a light emitting surface. Each of the light reflecting elements extends from the light emitting surface. Each of the light reflecting elements has an emanating point and a focal point. The emanating points overlap at the light emitting surface. One of the light sources is disposed at one of the focal points.