Light Source Module With Reflective And Color Conversion Layers
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Solution Overview
Problem
Direct-type backlight modules often exhibit bluish or dark colors due to unconverted blue light emitted from gaps between optical films and the backplane, leading to inefficient light utilization and poor color rendition.
Innovation Solution
A light source module design featuring a backplane with double surfaces and sidewalls, a reflective layer on the upper surfaces, and a color conversion layer between the reflective layer and optical films, which converts blue light into white light, improving light reflection and emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If optical films are disposed on the backplane in a direct-type backlight module, then the structure is simple and easy to manufacture, but blue light emitted from gaps between optical films and backplane causes bluish or dark colors around the module
Solution Approach 1:
The patent applies this principle by converting the harmful unconverted blue light into beneficial white light through color conversion layers. The blue light that would normally cause bluish colors around the module is instead directed through reflective layers to excite yellow phosphors, converting it into white light that improves overall illumination and eliminates the color imbalance issue.
Solution Approach 2:
The patent introduces reflective layers and color conversion layers as intermediary elements between the blue light source and the optical films. These intermediaries capture the blue light that would otherwise escape, convert it through phosphors, and redirect it as white light, thereby mediating the harmful effect of unconverted blue light.
2Illumination intensity
If blue light is emitted from gaps between optical films and backplane, then light emission occurs, but the light is not excited or converted by color conversion film leading to poor color rendition
Solution Approach 1:
The patent converts the harmful unconverted blue light into beneficial white light by introducing yellow phosphors that are excited by blue light. This conversion process transforms the problematic direct blue emission into a mixed white light that provides superior color rendition while maintaining illumination intensity.
Solution Approach 2:
The patent employs color conversion layers containing phosphors that change the color of light from blue to white. The yellow phosphors absorb blue light and emit yellow light, which combines with remaining blue light to produce white light, thereby fundamentally changing the color characteristics of the emitted light.
3Productivity
If reflective layer and color conversion layer are added between optical film and backplane, then light conversion efficiency improves, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into integrated layers. The reflective layer and color conversion layer are combined in a stacked configuration where the reflective layer serves both to reflect light and support the color conversion layer, reducing the need for separate structural components and simplifying the overall device architecture despite adding functional layers.
Solution Approach 2:
The reflective layer serves multiple functions: it reflects blue light toward the color conversion layer, provides structural support for the color conversion layer, and helps manage light distribution. This multi-functionality reduces the need for additional separate components, offsetting the complexity increase from adding functional layers.
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 module effectively converts blue light into white light, reducing bluish colors and enhancing light emission, thereby improving brightness and color uniformity around the module while reducing manufacturing costs and time.
Implementation Method 1
a color conversion layer, and at least one optical film. The backplane has a first bottom surface, a first sidewall surface, a second bottom surface, and a second sidewall surface. The first sidewall surface is connected between the first bottom surface and the second bottom surface. The second bottom surface is higher than the first bottom surface and connected between the first sidewall surface and the second sidewall surface. The light source is disposed on the first bottom surface. The reflective layer is disposed on the second bottom surface and the second sidewall surface. The color conversion layer is disposed on the reflective layer.
Data Source
AI summary
A light source module includes a backplane, a light source, a reflective layer, a color conversion layer, and at least one optical film. The backplane has a first bottom surface, a first sidewall surface, a second bottom surface, and a second sidewall surface. The first sidewall surface is connected between the first bottom surface and the second bottom surface. The second bottom surface is higher than the first bottom surface and connected between the first sidewall surface and the second sidewall surface. The light source is disposed on the first bottom surface. The reflective layer is disposed on the second bottom surface and the second sidewall surface. The color conversion layer is disposed on the reflective layer. The at least one optical film is placed on the second bottom surface. The reflective layer and the color conversion layer are located between the at least one optical film and the backplane.