Optical Sheet Matching Flanges Prevent Light Leakage
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Solution Overview
Problem
In display apparatuses with a light guide plate and optical sheet, light leakage through gaps between the optical sheet and panel support portions can cause luminance unevenness, which is not adequately addressed in existing designs.
Innovation Solution
A display apparatus with a light guide plate and an optical sheet comprising multiple unit sheets stacked in a specific manner, where the unit sheets have flanges that match the shape of accommodation portions in a holding frame member, preventing light from reaching the display panel through these gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the panel support portion is not provided between the light guide plate and the optical sheet to decrease the thickness, then the thickness is reduced, but light may leak through the gap between the optical sheet and the panel support portion causing luminance unevenness
Solution Approach 1:
The patent introduces a light blocking structure as an intermediary element positioned between the optical sheet and the panel support portion. This light blocking structure fills the gap and prevents light from leaking through, thereby maintaining luminance uniformity while allowing the panel support portion to be omitted for thickness reduction
Solution Approach 2:
The patent extracts the light blocking function from the panel support portion and implements it as a separate light blocking structure. This allows the panel support portion to be removed for thickness reduction while the light blocking function is preserved through the dedicated light blocking structure
2Reliability
If the panel support portion is provided between the light guide plate and the optical sheet to prevent light leakage, then luminance uniformity is improved, but the thickness increases
Solution Approach 1:
The light blocking structure serves as a mediator that prevents light leakage through the gap without requiring the panel support portion to be present, thus maintaining luminance uniformity while avoiding the thickness increase that would result from adding a panel support portion
Solution Approach 2:
The light blocking structure is positioned locally at the gap region between the optical sheet and the panel support portion, providing light blocking only where needed. This localized approach prevents light leakage without adding overall thickness to the entire assembly
Data Source
AI summary
Provided is a display device that can prevent light emitted from, a light guide plate from arriving at a display panel via a gap in an optical sheet and a gap between the optical sheet and a holding frame member. The display device is provided with: a light guide plate having a light exit surface; an optical sheet that is arranged facing the light exit surface, that is configured from a plurality of stacked unit sheets, and in which a plurality of flanges are arranged in each of the unit sheets so as to extend along the sheet surface of the unit sheet from the side edge of the unit sheet toward the exterior; and a holding frame member having formed therein a plurality of accommodating sections in which the flanges of the optical sheet are accommodated when holding the optical sheet. One or more of the plurality of flanges in each of the unit sheets is a matching flange having a shape that matches the shape of the accommodating section along the sheet surface. In this way, the accommodating section blocks light from the light guide plate by accommodating one or more of the matching flanges.