Mixed Light Apparatus for LCD Backlight Uniformity
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Solution Overview
Problem
Direct type backlight modules for LCDs face issues with poor light mixing due to reduced distance between light sources, resulting in yellowish bluish light, low energy, and low color saturation, and lack of adjustable color output.
Innovation Solution
A mixed light apparatus with a body and multiple light reflecting elements, each corresponding to a light source, where the light sources are positioned at focal points and overlapping emanating points on a light emitting surface, utilizing transparent materials like glass or PMMA, and incorporating reflection enhancement and scattering films to enhance light mixing and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the distance between light source and diffusion plate is shortened to achieve thin and lightweight LCDs, then the thickness and weight are reduced, but light mixing becomes poor resulting in yellowish bluish light instead of white light
Solution Approach 1:
A light guiding element is introduced as an intermediary component between the light source and the observer. This element guides light from multiple LED sources (red, green, blue) to a common exit point, enabling effective light mixing in a compact space. The light guiding element acts as a mediator that solves the light mixing problem without requiring large distances.
Solution Approach 2:
The patent transitions from a planar light mixing approach to a three-dimensional light guiding structure. By using a light guiding element with specific geometric features (such as a hemispherical or lens-shaped structure), light from multiple sources is mixed in the vertical dimension rather than relying on horizontal distance, enabling compact design with effective light mixing.
2Area of stationary object
If a large number of red, green and blue LEDs are utilized for large-scale LCD production, then the display area is increased, but the white light emitted has low energy and low color saturation
Solution Approach 1:
Multiple light sources (red, green, and blue LEDs) are merged into a single light guiding element structure. Their light paths converge at a common exit point, allowing the combined light output to achieve high color saturation and energy efficiency. This merging approach enables large display areas while maintaining high quality light output.
3Device complexity
If traditional direct type backlight module structure is used, then the structure is simple, but the color of mixed light cannot be adjusted as desired and uniformity is poor
Solution Approach 1:
The patent introduces controllable light sources (LEDs with adjustable intensity) and a light guiding element that enables dynamic control of light mixing ratios. This allows the color output to be adjusted as desired while maintaining a relatively simple overall structure. The system can adapt to different color requirements without complex mechanical adjustments.
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 apparatus produces white light with high color saturation, uniformity, and energy, and allows for adjustable color output by effectively mixing light from red, green, and blue LEDs, overcoming the limitations of existing direct type backlight modules.
Implementation Method 1
a first light reflecting element, and a second light reflection. The body has a light emitting surface. A first reflecting element extends from the light emitting surface. The first light reflecting element has a first emanating point and a first focal point. The first light source is disposed at the first focal point.
Data Source
AI summary
A mixed light apparatus for mixing light emitted from a first light source and a second light source includes a body, a first light reflecting element and a second light reflecting element. The body has a light emitting surface. A first reflecting element extends from the light emitting surface. The first light reflecting element has a first emanating point and a first focal point. The first light source is disposed at the first focal point. A second reflecting element extends from the light emitting surface. The second light reflecting element has a second emanating point and a second focal point. The second light source is disposed at the second focal point. The first emanating point and the second emanating point overlaps and are disposed on the light emitting surface.