Optical Sheet Segmentation for Display Light Leakage Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display apparatuses, light leakage through gaps between the optical sheet and the panel support portion can cause luminance unevenness, which is not adequately addressed in existing thin display apparatus designs.
Innovation Solution
A display apparatus with a light guide plate, a display panel, and an optical sheet, where the optical sheet is composed of stacked rectangular unit sheets and a holding frame portion with protrusions and engageable flanges that secure the unit sheets to prevent light from reaching the display panel through gaps between the optical sheet and the holding frame.
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 leakage occurs through the gap between the optical sheet and the panel support portion causing luminance unevenness
Solution Approach 1:
The optical sheet is divided into multiple unit sheets (first unit sheet, second unit sheet, etc.) stacked together. Each unit sheet can be independently secured to the holding frame portion, allowing precise control of positioning while maintaining thin overall structure. This segmentation enables the optical sheet to effectively block light leakage paths without requiring a thick panel support portion.
Solution Approach 2:
Multiple unit sheets are stacked and nested within the holding frame portion, with each sheet secured to protrusions on the frame. This nested arrangement maximizes the light-blocking effectiveness within the minimal thickness available, creating multiple barriers against light leakage while maintaining a compact structure.
2Reliability
If a 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 holding frame portion uses a dynamic securing mechanism where unit sheets are attached to protrusions that can accommodate slight variations in positioning. This allows the structure to adapt to manufacturing tolerances while maintaining effective light blocking, achieving luminance uniformity without requiring excessive thickness.
Solution Approach 2:
Instead of preventing light leakage through increased thickness in the vertical dimension, the invention uses multiple unit sheets stacked in the vertical dimension to create overlapping barriers. This approach blocks light leakage paths effectively while minimizing the required thickness compared to a solid panel support structure.
3Reliability
If the optical sheet is secured to the holding frame portion using multiple protrusions and unit sheets, then light leakage is prevented, but the device complexity increases
Solution Approach 1:
The optical sheet is segmented into multiple unit sheets that can be independently secured to the holding frame portion. Each unit sheet is attached to specific protrusions, creating a modular assembly that is easier to manufacture and assemble than a monolithic structure. This segmentation simplifies the securing process while effectively preventing light leakage through multiple barriers.
Solution Approach 2:
The protrusions on the holding frame portion automatically secure the unit sheets through a snap-fit or friction-based mechanism, eliminating the need for additional fasteners or complex assembly steps. The unit sheets self-position and self-secure to the protrusions, reducing device complexity while ensuring reliable light leakage prevention.
Data Source
AI summary
A display device is provided with: a light guide plate having a light exit surface that emits light; a display panel; an optical sheet that is interposed between the light guide plate and the display panel and that comprises a plurality of rectangular unit sheets; and a holding frame section that surrounds the optical sheet and that holds the optical sheet. The holding frame section comprises a first side for holding the optical sheet, and a second side and a third side that intersect the first side at the two ends of the first side. A first protrusion and a second protrusion are provided to the two ends of the first side in the lengthwise direction thereof. A first unit sheet and a second unit sheet are each fixed by the first protrusion and the second protrusion. The second side faces an end side of the first unit sheet; and is in contact with all of said end side. The third side faces an end side of the second unit sheet and is in contact with all of said end side. As a result, light from the light exit surface of the light guide plate is prevented from leaking from a gap between the holding frame section and the optical sheet.