Light Conversion Film for Thin Backlight Uniformity
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Solution Overview
Problem
The existing backlight units in display devices face challenges in reducing thickness while maintaining image quality, as a sufficient optical gap between light sources and the display panel is often not formed, leading to degraded image quality when trying to minimize thickness.
Innovation Solution
The proposed solution involves a backlight unit design with multiple light conversion patterns and a reflective plate, where the base film with light path change patterns is disposed between light sources and optical elements, and a color conversion pattern is used to convert wavelengths of light, allowing for uniform white light provision without a color conversion sheet, thereby simplifying the structure and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the backlight unit is reduced to reduce the thickness of the display device, then the thickness of the display device is reduced, but a sufficient optical gap between the light source and the display panel cannot be formed, leading to degraded image quality
Solution Approach 1:
The patent combines the light path change function and color conversion function into a single integrated film structure. The base film with light path change patterns and color conversion patterns are merged into one component, eliminating the need for separate light guiding plates and color conversion sheets, thereby reducing overall thickness while maintaining optical performance
Solution Approach 2:
The base film serves multiple functions simultaneously: it acts as a light guide, provides light path change through engraved patterns, performs color conversion through phosphor patterns, and serves as a structural support. This multi-functionality allows the backlight unit to maintain sufficient optical gap for image quality while minimizing thickness
2Reliability
If multiple optical elements are used to provide uniform white light, then image quality is improved, but the structure becomes complex and the number of elements increases
Solution Approach 1:
The patent merges the light guiding function (typically requiring separate light guiding plates) and color conversion function (typically requiring separate color conversion sheets) into a single integrated base film structure with both light path change patterns and color conversion patterns, reducing the number of elements while maintaining luminance uniformity
Solution Approach 2:
The base film is designed to perform multiple optical functions simultaneously: light guidance, light path modification through engraved patterns, and color conversion through phosphor materials. This multi-functionality eliminates the need for multiple separate optical elements while achieving uniform white light output
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
This design enhances image quality by uniformly distributing light and reducing the number of elements, achieving a thinner backlight unit that provides improved luminance uniformity and image quality.
Implementation Method 1
a light path change pattern and a color conversion pattern disposed on the base film, wherein the light path change pattern changes a traveling path of light
Implementation Method 2
the color conversion pattern converts wavelengths of light, allowing for uniform white light provision
Data Source
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AI summary
Embodiments of the present disclosure relate to a light conversion film, a backlight unit and a display device, and according to the embodiments, white light can be produced by a simplified configuration and be uniformly provided to a panel by disposing, over areas corresponding to light sources (240), patterns (410) changing traveling paths of light emitted from a light source (240) and patterns (420) converting wavelengths of light. Further, by allowing a base film (300) to provide a function of guiding light by disposing, over a light source (240), the base film (300) on which a light path change pattern (410) and a color conversion pattern (420) are disposed to be adjacent to the light source (240), it is possible to minimize a thickness of the backlight unit and enhance image quality presented by illumination of the backlight unit.