Acute-Angled Partition Wall for Liquid Crystal Display Light Guides
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Solution Overview
Problem
In liquid crystal display devices using local dimming, the partition frame between light guides can appear dark, leading to a visible dark line on the display screen due to uncontrolled light emission.
Innovation Solution
A planar light source device with independently drivable light sources, light guides, and a partition frame featuring acute-angled partition walls that create gaps between the light guides, ensuring light is reflected away from the partition frame, preventing it from appearing dark.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a partition frame is provided between light guides to prevent light emission to adjacent regions, then light leakage control is improved, but the partition frame portion becomes dark and appears as a dark line on the display screen
Solution Approach 1:
The partition frame is divided into multiple partition walls that extend from the mounting surface toward the light guides, creating segmented regions. This segmentation allows light to be directed along the partition walls while maintaining the light-blocking function, preventing the partition frame from appearing dark.
Solution Approach 2:
The partition walls are configured with different properties at different locations. The partition walls have surfaces that reflect light toward the light guides, creating local bright regions that counterbalance the dark appearance, while still maintaining the overall light-blocking function of the partition frame.
2Object-generated harmful factors
If partition walls are positioned close to light guides for effective light control, then light leakage prevention is improved, but light may be reflected back causing the partition frame to appear dark
Solution Approach 1:
The partition walls are designed with asymmetric configurations where the distances from the mounting surface to the light guides vary. This asymmetry allows optimized light control while preventing uniform dark reflection patterns, ensuring the partition frame appears bright in certain regions.
Solution Approach 2:
The partition walls extend in the vertical dimension from the mounting surface toward the light guides, creating a three-dimensional structure. This dimensional extension allows light to be directed along the walls while maintaining the light-blocking function, preventing the partition frame from appearing dark.
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
This configuration effectively suppresses the darkening of the partition frame, enhancing the display's visual quality by ensuring light is directed towards the intended regions rather than being reflected back and causing the frame to appear dark.
Implementation Method 1
a first light guide to emit light incident from a first light source included in the plurality of light sources from a first emitting surface in an emitting direction opposite to a direction from the first light source toward the light source substrate
Implementation Method 2
an angle formed by a wall surface of the partition wall on a side of the first light guide and a bottom face of the partition wall is an acute angle
Data Source
AI summary
A planar light source device includes a plurality of light sources that is independently drivable, a first light guide to emit light incident from the first light source from an emitting surface in an emitting direction, a second light guide that is contained in a second light emitting region adjacent to a first light emitting region containing the first light guide and emits light incident from a second light source from the emitting surface in the emitting direction, and a partition frame having a partition wall that is positioned between the first light guide and the second light guide, partitions the first light emitting region and the second light emitting region, and is provided with a gap from the emitting surface of the first light guide, in which an angle formed by a wall surface and a bottom face of the partition wall is an acute angle.