Light Guide Plate Concave Microstructures Backlight Transparency
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Solution Overview
Problem
Current transparent display apparatuses with edge-lit backlight modules face challenges in providing sufficient light without a reflective plate, which either blocks the view of scenes behind the module or reduces light outputting efficiency.
Innovation Solution
Incorporating a light guide plate with concave microstructures and reflective bodies on its rear surface, positioned below the display panel, to enhance light reflection and outputting effect without the need for a reflective plate, allowing users to see both the displayed image and the scene behind the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective plate is used in the edge-lit backlight module, then light outputting efficiency is improved, but the user cannot see the scene behind the backlight module
Solution Approach 1:
The reflective plate is segmented into multiple small reflective bodies (reflective beads or reflective flakes) that are distributed on the rear surface of the light guide plate. This segmentation allows light to be reflected in multiple directions, with some light directed toward the display panel and some light allowing transmission to the rear surface, thus resolving the contradiction between light output efficiency and viewing transparency.
Solution Approach 2:
The rear surface of the light guide plate is given local reflective quality through the distributed reflective bodies, while the overall structure maintains transparency. The reflective bodies are strategically placed and sized to provide sufficient light reflection locally without creating a continuous opaque barrier, enabling both light output and scene visibility.
2Object-affected harmful factors
If the reflective plate is omitted, then the user can see the scene behind the backlight module, but light outputting efficiency is reduced
Solution Approach 1:
The light guide plate itself serves the dual function of guiding light and providing reflection through its integrated rear surface structures (concave microstructures and reflective bodies). This self-service approach eliminates the need for a separate reflective plate, maintaining transparency while achieving sufficient light output through the light-trapping and reflection effects of the microstructures.
Solution Approach 2:
The light guide plate combines transparent material with microstructured surfaces and reflective particles to create a composite structure that simultaneously achieves light guidance, light reflection, and transparency. The combination of these elements provides the necessary light outputting efficiency without compromising the ability to view scenes behind the display.
3Illumination intensity
If concave microstructures with reflective bodies are added to the light guide plate, then light outputting efficiency is improved, but device complexity increases
Solution Approach 1:
The concave microstructures and reflective bodies are integrated directly into the light guide plate as a unified structure, merging the light guidance function and light reflection function into a single component. This integration avoids the need for separate reflective plates or additional complex optical elements, achieving improved light output while minimizing the increase in device complexity.
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 light outputting efficiency and allows unobstructed viewing of scenes behind the display, maintaining the transparency and visual clarity while preventing Moiré patterns and dot-shaped patterns from appearing.
Implementation Method 1
the concave microstructures and the reflective bodies therein can reflect the light, thereby promoting the light outputting effect
Data Source
AI summary
A display apparatus includes a display panel, a light guide plate, at least one light source and at least one reflective body. The light guide plate is disposed below the display panel. The light guide plate has a light-incident surface, a light-emitting surface, a rear surface, a plurality of concave microstructures and a plurality of reflective bodies. The rear surface is located farther away from the display panel than the light-emitting surface is. The light-incident surface is connected to the light-emitting surface and the rear surface. The concave microstructures are located on the rear surface. The reflective bodies are respectively located in the concave microstructures. The light source is disposed opposite to the light-incident surface.