Lighting Device Notch Luminance Uniformity via Condensing Member
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Solution Overview
Problem
Edge-lighting backlight devices with notched light-guiding plates experience uneven luminance due to blocked light paths, leading to reduced luminance in regions closer to the notch, and existing solutions complicate the configuration and increase costs by placing light sources on the opposite side.
Innovation Solution
A lighting device with a light-guiding plate and a condensing member having a reflecting surface that reflects and condenses leaked light back into the shielded region, ensuring uniform luminance by reentry of light through the exit opposite surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a notch is provided in the light-guiding plate, then the display device can accommodate other components (e.g., sensors, cameras), but luminance unevenness occurs in the region closer to the entrance opposite surface
Solution Approach 1:
The patent utilizes the light that would normally be wasted (leaked light exiting the exit opposite surface) and redirects it back into the shielded region through the condensing member. This converts the harmful effect of light leakage into a beneficial effect that illuminates the previously dark region, thereby resolving the luminance unevenness caused by the notch while maintaining the notch's functionality for component accommodation.
Solution Approach 2:
The condensing member acts as an intermediary element between the leaked light and the shielded region. It captures the light exiting through the exit opposite surface and redirects it toward the shielded region, serving as a mediator that transfers light from one location to another to achieve uniform illumination.
2Illumination intensity
If a light source is provided on the side of the entrance opposite surface to compensate for luminance unevenness, then luminance uniformity improves, but the configuration becomes more complicated and size increases
Solution Approach 1:
Instead of adding a separate light source to serve the shielded region, the patent makes the existing light source serve dual purposes. The light from the original light source, after leaking through the exit opposite surface, is redirected back to illuminate the shielded region. This self-service approach eliminates the need for additional light sources and reduces device complexity.
Solution Approach 2:
The condensing member enables the existing light source to perform multiple functions: illuminating both the main region and the shielded region. By redirecting leaked light back into the shielded region, the system achieves uniform illumination without requiring dedicated lighting for each region, thereby reducing overall device complexity.
3Illumination intensity
If a light source is provided on the side of the entrance opposite surface to compensate for luminance unevenness, then luminance uniformity improves, but the cost increases
Solution Approach 1:
The patent makes the existing light source serve dual purposes by redirecting its leaked light back into the shielded region. This self-service approach eliminates the need for additional light sources and associated costs, achieving luminance uniformity without increasing device cost.
Solution Approach 2:
Instead of discarding the leaked light that exits through the exit opposite surface, the patent recovers it by redirecting it back into the shielded region using the condensing member. This recovery approach eliminates waste and reduces the need for additional lighting components, thereby reducing overall device cost.
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 effectively reduces luminance unevenness by re-routing leaked light back into the shielded area, maintaining uniform illumination without increasing the device's complexity or cost.
Implementation Method 1
a condensing member having a reflecting surface that reflects, in a condensing manner toward the shielded region, light having leaked out through the exit opposite surface is provided opposite the exit opposite surface of the light-guiding plate
Data Source
AI summary
A lighting device includes a light-guiding plate and a light source. The light-guiding plate includes a light entrance surface, an entrance opposite surface located opposite to the light entrance surface, a light exit surface, and an exit opposite surface located opposite to the light exit surface. The light-guiding plate has a notch formed by notching a part thereof. A region between the notch and the entrance opposite surface is a shielded region where the notch blocks light guided through inside the light-guiding plate from the light entrance surface toward the entrance opposite surface, and a condensing member having a reflecting surface that reflects, in a condensing manner toward the shielded region, light having leaked out through the exit opposite surface is provided opposite the exit opposite surface of the light-guiding plate.