Light Guide Plate Serration Pattern for Edge-Lit Backlight Luminance
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Solution Overview
Problem
Edge-lit type backlight units (BLUs) have relatively low luminance compared to direct-lit type BLUs, which affects image quality and cost-effectiveness in liquid crystal display devices.
Innovation Solution
A light guide plate with a serration pattern on the light incident surface, featuring varying thicknesses to increase light incidence, including a flat portion and a light input portion with increased thickness, enhances light path control and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If edge-lit type BLU structure is used, then product thickness and cost are reduced, but luminance is insufficient
Solution Approach 1:
The light guide plate employs varying thickness design where the light incident surface has greater thickness than the light output surface. This local quality variation allows the plate to capture more incident light at the entry point while maintaining appropriate light distribution to the display panel, thereby improving luminance without requiring a complete redesign of the entire BLU structure
Solution Approach 2:
The invention changes the physical parameter of thickness distribution within the light guide plate. By making the thickness vary from the light incident surface to the light output surface, the optical path length is extended, allowing more light to be captured and guided effectively, thus improving luminance output while maintaining the edge-lit structure
2Quantity of substance
If light guide plate thickness is increased, then light incidence amount is improved, but manufacturing complexity increases
Solution Approach 1:
The light guide plate is segmented into distinct regions with different thickness characteristics: a light incident surface portion with greater thickness and a light output surface portion with smaller thickness. This segmentation allows each region to be optimized for its specific function while simplifying the overall manufacturing process compared to creating entirely new structures
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 modified light guide plate design increases light incidence, thereby improving luminance and overall image quality while reducing costs associated with BLUs.
Implementation Method 1
a light incident portion in which a thickness is changed in a light incident surface of a light guide plate can increase the amount of the light incident to the light guide plate, and thus the luminance of the light guide plate can be entirely improved by controlling a light path
Implementation Method 2
a reflective surface located a side opposite the light guide plate
Data Source
AI summary
Disclosed are a light guide plate and a backlight unit including the same. The light guide plate includes: a light guide plate including: a light output surface for outputting light to the outside; a reflective surface which is located in the opposite side of the light guide plate; and a light incident surface which is provided in at least one side surface among side surfaces connecting the light output surface and the reflective surface, and to which the light emitted from a light source is incident. A flat portion having a constant thickness is provided in a space which is spaced apart from the light incident surface, and a light input portion is formed in a space between the light incident surface and the flat portion, and a thickness of the light input portion is changed in a greater range than that of the flat portion.