L-Shaped Reflection Member for LCD Light Leakage Control
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Solution Overview
Problem
In liquid crystal display devices using the side lighting method, light leakage occurs between the LED and the light guiding plate, leading to reduced display quality due to bright lines and uneven brightness distribution.
Innovation Solution
A liquid crystal display device configuration that includes a light guiding plate, a reflection member with an L-shaped cross section, and a frame with tapered holes to direct light emission efficiently, reducing light leakage and improving brightness distribution by using a reflection member to cover only inter-light-source areas and ensuring proper alignment with the liquid crystal panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a side lighting method is used with LED and light guiding plate, then power consumption is reduced and device size is minimized, but light leakage occurs between the LED and light guiding plate causing bright lines and reduced display quality
Solution Approach 1:
A reflection member is introduced as an intermediary component between the light guiding plate and the frame. This reflection member has a light-reflecting surface that faces the light source, and it reflects leaked light back toward the light guiding plate, preventing direct incidence on the liquid crystal panel and eliminating bright lines while maintaining the side lighting method's energy efficiency
Solution Approach 2:
The reflection member is positioned specifically in the inter-light-source areas where light leakage occurs, rather than covering the entire structure. This localized approach addresses the specific problem of light leakage between LED sources without adding unnecessary complexity or cost to areas where light leakage does not occur
2Manufacturing precision
If a reflection member is added to prevent light leakage, then display quality is improved, but device complexity increases
Solution Approach 1:
The reflection member is implemented as a thin film or sheet with light-reflecting properties, rather than a bulky three-dimensional structure. This thin-film approach provides the necessary light reflection function while minimizing additional space requirements and structural complexity, allowing easy integration into the existing side lighting configuration
Solution Approach 2:
Instead of designing a completely new light control structure, the invention uses a reflection member that copies the light-redirecting function already present in direct lighting methods. By reflecting leaked light back to the light guiding plate, it replicates the desired light distribution pattern without requiring a fundamental redesign of the side lighting system
3Illumination intensity
If the frame structure is modified to accommodate multiple light sources, then light distribution is improved, but manufacturing cost increases
Solution Approach 1:
The frame is divided into multiple sections with holes formed at regular intervals to accommodate multiple LED light sources. This segmented structure allows light to be emitted from multiple points along the light guiding plate, improving brightness distribution and uniformity across the display area while using simple, repeatable manufacturing features
Solution Approach 2:
Instead of trying to control light distribution through complex internal structures of the light guiding plate or by positioning LEDs at precise angles, the invention inverts the approach by using the frame's hole structure to define light source positions and using reflection members to redirect leaked light. This simplifies the manufacturing requirements while achieving improved brightness distribution
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
Enhances display quality by minimizing light leakage, improving brightness distribution, and extending the service life of the device through efficient heat dissipation and reduced processing costs.
Implementation Method 1
a reflection member which covers from the emission surface of the light guiding plate to the plate-shaped member, the reflection member being made of a material that reflects the light
Data Source
AI summary
There is provided a liquid crystal display device including: a light source; a light guiding plate which takes in light generated from the light source, from a light incident surface, and emits the light from an emission surface as planar light; a plate-shaped member which has a surface perpendicular to an emission direction of the light of the light source and is disposed at least on the periphery of the light source; and a reflection member which covers from the emission surface of the light guiding plate to the plate-shaped member, the reflection member being made of a material that reflects the light.