Backlight Unit Prism Sheet Design for Luminance and Thickness
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Solution Overview
Problem
Conventional backlight units for flat displays are costly due to the use of two high-cost prism sheets, result in reduced luminance, and suffer from Moire interference and increased thickness, as well as non-uniform luminance distribution.
Innovation Solution
A backlight unit design incorporating a light guide panel with conical dot patterns and a single prism sheet featuring prism patterns with specific inclined faces and auxiliary inclined faces to enhance light transmission and diffusion, reducing the need for multiple diffusing sheets and prism sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two prism sheets are used in the conventional backlight unit, then light collection and transmission are improved, but manufacturing cost increases and thickness increases
Solution Approach 1:
The patent combines the functions of two separate prism sheets into a single integrated prism sheet structure. The first and second prism sheets are merged into one component with combined optical functions, reducing the total number of parts while maintaining light collection and transmission performance. This merging eliminates the need for multiple separate prism sheets and reduces overall thickness.
Solution Approach 2:
The single integrated prism sheet performs multiple functions that were previously divided between two separate prism sheets. It simultaneously provides light collection, transmission, and directional control functions, making the component multi-functional and reducing the overall system complexity.
2Illumination intensity
If two prism sheets are used in the conventional backlight unit, then light collection is improved, but Moire interference occurs and appearance quality deteriorates
Solution Approach 1:
By merging two prism sheets into one integrated structure, the patent eliminates the interface between separate sheets that causes Moire interference. The unified prism sheet structure prevents the interference patterns that occur when light passes through multiple layered prism structures with different orientations.
3Illumination intensity
If multiple diffusing sheets and prism sheets are used, then light diffusion and collection are improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple optical components (diffusing sheets and prism sheets) into a more integrated structure. By combining these functions into fewer components, the patent reduces the total number of parts that need to be manufactured, assembled, and aligned, thereby reducing manufacturing cost while maintaining optical performance.
Solution Approach 2:
The integrated optical components perform multiple functions simultaneously - light diffusion, collection, and directional control - within single structures. This multi-functionality reduces the need for separate dedicated components for each function, simplifying the overall system and reducing manufacturing complexity and cost.
4Illumination intensity
If multiple optical sheets are used in the conventional backlight unit, then optical functions are improved, but the thickness of the backlight unit increases
Solution Approach 1:
The patent merges multiple optical sheets into a single integrated prism sheet structure, consolidating the thickness of multiple separate components into one thinner integrated component. This merging reduces the cumulative thickness while maintaining the combined optical functions of light collection, transmission, and directional control.
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 improves optical efficiency, reduces manufacturing costs and thickness, enhances luminance uniformity, and minimizes Moire interference, resulting in a thinner and more economical backlight unit with improved appearance and performance.
Implementation Method 1
The light guide panel 110 guides light, which is introduced into the light guide panel via the first side face 116, to the second side face 118 by means of internal reflection.
Implementation Method 2
The respective dot patterns 120 have a shape of a hemispherical groove so as to reflect and diffuse incident light.
Implementation Method 3
The first diffusing sheet 150 is arranged such that a lower face thereof confronts the upper face 114 of the light guide panel 110, so as to scatter and transmit the incident light.
Implementation Method 4
The first prism sheet 160 collects, transmits, and reflects incident light on a cross sectional thereof
Data Source
AI summary
A backlight unit including a light guide panel which has opposite upper and lower faces, and guides light, introduced into an inside thereof, between the upper and lower faces through internal reflection, and a prism sheet which collects and transmits the light, introduced from the light guide panel, and has, on its surface, a plurality of prism patterns, each having a first main inclined face, to which light introduced from the light guide panel is incident, a second main inclined face having a curvature or a plane which reflects light incident from the first main inclined face, and two auxiliary inclined faces which are opposite to each other between the first and second main inclined faces, and define a side face of the prism pattern.