Dual-Side Light Guide Display Device for Uniform Luminance
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Solution Overview
Problem
Transparent display devices experience luminance gradients due to uneven light distribution, leading to reduced luminance in regions far from the light source unit, and arranging light source units on multiple sides degrades visibility of superimposed display images and backgrounds.
Innovation Solution
A display device configuration with a liquid crystal layer between substrates, featuring light guide plates and light source units on opposite sides, utilizing adhesive layers and air layers to optimize light path and reduce luminance gradients, while maintaining visible light transmissivity across the display region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light source unit is arranged on the side surface of the light guide plate, then the device structure is simplified, but the luminance distribution becomes non-uniform and luminance is lowered in regions far from the light source unit
Solution Approach 1:
The patent transitions from a single-side light source arrangement to a dual-side arrangement, utilizing both the front surface and back surface of the substrate for light source placement. This dimensional expansion allows light to be introduced from opposite directions, achieving uniform luminance distribution across the display region while maintaining structural simplicity.
Solution Approach 2:
The light source system is segmented into multiple independent light source units positioned at different locations (front surface and back surface). Each light source unit independently illuminates specific regions, and their combined effect produces uniform overall luminance without requiring a single complex light distribution system.
2Illumination intensity
If light source units are arranged along mutually opposite two sides to eliminate luminance gradient, then luminance distribution becomes uniform, but the visibility of the observer when recognizing the display image and the background superimposed on each other is degraded
Solution Approach 1:
The patent applies different characteristics to different regions by positioning light source units with specific orientations on the front and back surfaces. The light sources are arranged to emit light in directions that optimize both luminance distribution and background visibility, with each local region receiving tailored illumination characteristics based on its position and function.
Solution Approach 2:
The light source units on the front surface and back surface are arranged asymmetrically with different orientations and emission characteristics. This asymmetric arrangement allows optimization of light paths to achieve uniform luminance while preserving background visibility, avoiding the symmetry that would cause visibility degradation.
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 achieves uniform luminance distribution and maintains visibility of both display images and backgrounds by adjusting light intensity and path, reducing the luminance gradient phenomenon and enhancing overall display performance.
Implementation Method 1
a first light guide plate which has a first light incident side surface and a first opposite side surface located on a side opposite to the first light incident side surface in a first direction
Implementation Method 2
a reflection film covering the first opposite side surface and the second opposite side surface. The first light incident side surface of the first light guide plate and the second light incident side surface of the second light guide plate are on the same side in the first direction
Implementation Method 3
a first adhesive layer; a second adhesive layer. The first adhesive layer is arranged in the peripheral region. The second adhesive layer is arranged in the display region
Implementation Method 4
In the display region, an air layer is interposed between the first substrate and the first light guide plate, and the second adhesive layer is interposed between the second substrate and the second light guide plate
Data Source
AI summary
A display panel (display device) includes a first light guide plate, a second light guide plate, a first light source unit, a second light source unit, and a reflection film. In a display region, an air layer is interposed between a first substrate and the first light guide plate, and a second adhesive layer is interposed between a second substrate and the second light guide plate. In a peripheral region, the first light guide plate, a first adhesive layer, the first substrate, the second substrate, the second adhesive layer, and the second light guide plate are interposed between a first reflection surface and a second reflection surface of the reflection film.