Trapezoidal Light Guide Bar for Transparent Display Luminance
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Solution Overview
Problem
Existing transparent display panels face challenges in achieving efficient light coupling and uniform luminance due to differences in substrate lengths and the placement of light source assemblies, leading to low optical efficiency and poor display performance.
Innovation Solution
The transparent display panel incorporates a first light guide bar with a trapezoidal cross-section between the light source assembly and the light incident surface, optimizing light coupling by directing light towards the substrate edges. This design enhances optical efficiency and improves luminance homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional light source assembly is placed directly adjacent to the substrate edge, then the structure is simple, but the light coupling efficiency is low and luminance homogeneity is poor
Solution Approach 1:
A light guide bar is introduced as an intermediary component between the light source assembly and the substrate. This light guide bar receives light from the light source and guides it to the substrate edge through its internal structure, improving light coupling efficiency and luminance homogeneity without significantly complicating the manufacturing process
Solution Approach 2:
The light guide bar extends in the thickness direction of the substrate, utilizing the Z-dimension to guide light horizontally along the substrate edge. This dimensional approach allows efficient light distribution without increasing the planar footprint or complicating the overall structure
2Adaptability or versatility
If substrates of different lengths are used to accommodate edge extension portions, then adaptability is improved, but optical efficiency decreases due to misalignment
Solution Approach 1:
The light guiding function is segmented from the substrate structure itself and assigned to a separate light guide bar component. This segmentation allows the substrate to have varying lengths for adaptability while the light guide bar independently ensures proper light alignment and coupling, preventing optical efficiency loss
Solution Approach 2:
The light guide bar provides localized light guiding functionality at the edge region where substrates of different lengths meet the light source. This local solution ensures proper optical coupling at the critical interface without requiring the entire substrate structure to be optimized, maintaining both adaptability and optical efficiency
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 use of a trapezoidal light guide bar significantly increases the central luminance and overall luminance homogeneity of the display panel, improving optical coupling efficiency and display performance.
Implementation Method 1
a first light guide bar located between the first light source assembly and the first light incident surface, wherein the first light guide bar has a first light guide bar surface facing the first light incident surface, a second light guide bar surface away from the first light incident surface, and a first light guide bar slope surface located between the first light guide bar surface and the second light guide bar surface
Data Source
AI summary
A transparent display panel and an electronic device are provided. The transparent display panel includes: a first substrate, a second substrate, and a liquid crystal layer therebetween, the second substrate having an edge extension portion located on a same side of the transparent display panel as a first light incident surface of the first substrate; a first light source assembly located on a side, where the first light incident surface is provided, of the first substrate a first light guide bar located between the first light source assembly and the first light incident surface, the first light guide bar having a first light guide bar surface, a second light guide bar surface, and a first light guide bar slope surface therebetween, an inner angle formed between the first light guide bar slope surface and the second light guide bar surface being less than or equal to 90 degrees.