Prism Sheet Projecting Piece Design for Dark Spot Suppression
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Solution Overview
Problem
Conventional light source apparatuses for liquid crystal display devices suffer from dark spots due to the positioning of projecting pieces, which can obstruct light and create uneven illumination, especially when viewed from certain angles.
Innovation Solution
A light source apparatus featuring a prism sheet with projecting pieces that engage with a frame, where the angles and positioning of these pieces are optimized to prevent dark spots from entering the display region, ensuring even illumination and minimizing obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If projecting pieces are arranged to fit the engaging concave portion on the frame for positioning optical sheets, then the optical sheets can be securely positioned, but light is blocked by the frame creating dark spots on the optical sheet depending on viewing angle
Solution Approach 1:
The projecting piece is designed to extend in a direction substantially perpendicular to the light guide plate, utilizing the vertical dimension to achieve positioning without blocking light in the horizontal plane. This dimensional approach allows the projecting piece to engage with the frame while maintaining light transmission paths.
Solution Approach 2:
The projecting piece is positioned at a specific location on the optical sheet where it can engage with the frame without interfering with the light transmission area. By locally positioning the engaging structure away from the central light transmission region, the design maintains both positioning stability and uniform illumination.
2Reliability
If the projecting piece extends to engage with the frame for positioning, then the optical sheet positioning is secured, but the projecting piece may enter the display region and create dark spots when viewed from certain angles
Solution Approach 1:
The projecting piece extends substantially perpendicular to the light guide plate, utilizing the vertical dimension for positioning engagement. This orientation ensures that the projecting piece does not protrude into the horizontal display region, preventing dark spots while maintaining positioning accuracy.
Solution Approach 2:
The optical sheet is segmented into functional regions: the projecting piece for positioning, the light transmission area for illumination, and the display region for visual output. By separating these functions spatially and the projecting piece being oriented perpendicular to the plate, each region operates independently without interfering with others.
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 solution effectively suppresses dark spots and ensures uniform illumination, enhancing the visual quality of the display by positioning the projecting pieces in a way that they do not enter the display region, even when viewed from different angles.
Implementation Method 1
a light guide plate for radiating light from the light source into a plane
Implementation Method 2
a plurality of optical sheets for adjusting the radiation direction of the light that passed through the light guide plate
Implementation Method 3
one of the plurality of optical sheets which is arranged at a position most distant from the light guide plate is a prism sheet, the prism sheet having (i) a plurality of prisms formed on one surface thereof
Data Source
AI summary
A light source apparatus include a light guide plate, a plurality of optical sheets and a frame, wherein one of the optical sheets is a prism sheet having a plurality of prisms on one surface and one or more integrally formed dark part suppressing projecting pieces engaging the frame. A pair of dark part suppressing sides adjoin the dark part suppressing projecting piece and form a first angle equal to or smaller than a dark part suppressing angle. Second angles making a pair of angles formed with a straight line and each of dark part suppressing sides are equal to or smaller than half of the dark part suppressing angle. The straight line passes through a region formed between the pair of dark part suppressing sides, passes through an intersection point of the pair of dark part suppressing sides and is parallel or perpendicular to ridge lines of the prisms.