Light Guide Groove With Absorber for Display Light Leakage
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Solution Overview
Problem
In display devices with thin light guide members, the leakage of visible light to adjacent optical paths is significant due to the limited depth of grooves, which affects the strength and optical performance of the device.
Innovation Solution
A display device design that incorporates a light guide member with a first groove on its surface, where the groove blocks optical paths from light-emitting elements and a light absorbing member is placed to reduce light leakage through the groove's clearance with the opposing surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the depth of the groove is increased to reduce light leakage, then the optical performance is improved, but the strength of the thin light guide member deteriorates
Solution Approach 1:
A light absorbing member is introduced as an intermediary element placed at the groove bottom to absorb stray light. This mediator allows the groove depth to remain shallow (preserving structural strength) while still effectively preventing light leakage through the clearance between the groove and opposing surface (maintaining optical performance).
Solution Approach 2:
The light absorbing member is strategically positioned only at the groove bottom where light leakage occurs, rather than increasing groove depth throughout. This localized approach addresses the optical performance issue at the critical location while preserving the overall structural integrity of the light guide member.
2Reliability
If the light absorbing member is positioned at the groove bottom, then light leakage is reduced, but the manufacturing complexity increases
Solution Approach 1:
The light absorbing member is integrated with the groove structure, combining two functional elements (groove for optical path separation and light absorbing member for stray light absorption) into a unified assembly. This merging reduces the number of separate components and simplifies the manufacturing process while maintaining effective light leakage reduction.
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 reduces visible light leakage between optical paths, maintaining the strength of the thin light guide member while enhancing the display's optical performance.
Implementation Method 1
a light absorbing member disposed on at least one of a first groove bottom of the first groove and a first groove facing portion of the second main surface, which faces the first groove bottom, and has a higher absorptivity of visible light than the light guide member
Data Source
AI summary
A first groove is formed in a first main surface of a light guide member. A decorative layer is molded with the light guide member and provided on a second main surface of the light guide member. The decorative layer includes a first light-emitting portion that radiates the visible light emitted from a first light-emitting element from the light guide member and a second light-emitting portion that radiates the visible light emitted from the second light-emitting element from the light guide member. The first light absorbing member is disposed on a first groove bottom of the first groove, and has an absorptivity of visible light, which is higher than that of the light guide member. The first groove is positioned to block an optical path from the first light-emitting element toward a second region and an optical path from the second light-emitting element toward a first region.