Transparent Display Luminance Uniformity via Dual-Side LED and Refractive Index Adhesive
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Solution Overview
Problem
The transparent display apparatus experiences a luminance gradient phenomenon where regions far from the light source have lower brightness due to uneven luminance distribution, which affects the visibility of the background and display image.
Innovation Solution
The solution involves arranging light source units on opposite sides of the display region with light guide plates bonded via adhesive layers of different refractive indices, ensuring that light is evenly distributed across the display area by reflecting and transmitting light effectively through the liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light source portion is arranged on the side surface of the light guide plate, then the transparent display apparatus can be constructed with light sources on the sides, but the luminance distribution in the display region becomes non-uniform and luminance decreases in regions far from the light source portion
Solution Approach 1:
The light source arrangement is segmented into multiple groups positioned at different locations around the light guide plate, with each group contributing to illuminating different regions of the display area, thereby achieving more uniform luminance distribution while maintaining the side-surface mounting approach
Solution Approach 2:
Different regions of the light guide plate are provided with different light source arrangements and adhesive layer configurations tailored to local luminance requirements, with specific focus on enhancing luminance in regions far from primary light sources through optimized adhesive layer refractive indices
2Illumination intensity
If adhesive layers with different refractive indices are used to improve luminance uniformity, then the luminance gradient phenomenon is reduced, but the device complexity increases due to multiple adhesive layer requirements
Solution Approach 1:
The refractive index parameter of adhesive layers is strategically varied in specific regions of the light guide plate to control light propagation and reflection, thereby improving luminance uniformity through controlled parameter changes rather than universal complexity
Solution Approach 2:
Different adhesive layers with different refractive indices are applied selectively to different regions of the light guide plate based on local luminance requirements, rather than uniformly across the entire device, thus reducing overall complexity while achieving the desired luminance uniformity
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 improves the uniformity of luminance across the display region, enhancing the visibility of both the display image and background by reducing the luminance gradient phenomenon, thus improving the overall performance of the transparent display apparatus.
Implementation Method 1
Refractive index of one of the first adhesive layer and the second adhesive layer is lower than the refractive index of the other
Implementation Method 2
arranged at a position facing a first side surface of the first light guide plate
Data Source
AI summary
A display panel includes a light guide plate fixed on a rear surface of a substrate via an adhesive layer, and a light guide plate fixed on a front surface of a substrate via an adhesive layer, a light source unit having light emitting diode elements, arranged on the rear surface of the substrate, and arranged at a position facing a side surface of the light guide plate, and a light source unit having a plurality of light emitting diode elements, arranged on the front surface of the substrate, and arranged at a position facing a side surface of the light guide plate. Refractive index of one of the adhesive layer and the adhesive layer is lower than refractive index of the other. The side surface of the light guide plate and the side surface of the light guide plate are on the same side in a first direction.