Light Guide Plate Non-Display Area Brightness Uniformity
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Solution Overview
Problem
In edge-light type lighting devices for display devices with non-display areas, light from the LED source is blocked by mounting members, leading to uneven brightness due to the positioning of through holes in the light guide plate, resulting in reduced overall brightness.
Innovation Solution
The lighting device incorporates a light guide plate with a non-light exit portion and a light receiving surface, where the light receiving surface is designed to maximize the inclination of light rays, and a reflecting portion is positioned to redirect these inclined rays towards the non-light exit portion, ensuring that light reaches areas opposite the LED source, thus minimizing brightness unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a through hole is formed in the light guide plate to provide a non-display area, then the non-display area is created within the display area, but light from the LED source is blocked by mounting members resulting in uneven brightness
Solution Approach 1:
The light guide plate is designed with different functional regions: a light exit surface for light emission and a light receiving surface for capturing inclined light rays. This local differentiation allows the plate to simultaneously provide a non-display area while maintaining uniform brightness by redirecting light around the through hole.
Solution Approach 2:
The patent utilizes the thickness dimension of the light guide plate by forming a light receiving surface on the side edge. This three-dimensional approach allows inclined light rays to be captured and redirected, solving the brightness uniformity problem that cannot be addressed by two-dimensional surface modifications alone.
2Adaptability or versatility
If the through hole is positioned in front of the LED light source, then the non-display area is achieved, but light from the LED source is blocked resulting in reduced overall brightness
Solution Approach 1:
The light receiving surface acts as an intermediary element that captures inclined light rays and redirects them through the light guide plate. This mediator allows light to reach areas that would otherwise be blocked by mounting members, maintaining light output efficiency while accommodating the non-display area configuration.
Solution Approach 2:
The light receiving surface is positioned to intercept and redirect light rays before they are completely blocked by mounting members. By performing this preliminary light redirection action, the system prevents light loss and maintains overall brightness while still providing the non-display area.
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 effectively reduces brightness unevenness in the display area, ensuring more consistent light distribution across the display device by ensuring that light from the LED source reaches the intended areas within the light guide plate.
Implementation Method 1
The reflecting portion is arranged opposite the light receiving surface and reflects the maximum inclination light from the light receiving surface toward the non-light exit portion
Data Source
AI summary
A lighting device includes a light source emitting light having an orientation distribution around an optical axis, a light guide plate having a hole and including a light entrance surface, a light exit surface, a non-light exit portion, and a light receiving surface, and a reflecting portion. The light entrance surface is opposite the light source such that the optical axis overlaps the hole. The non-light exit portion is the hole and surrounded by the light exit surface. The light receiving surface is next to the light entrance surface and near the non-light exit portion and receives maximum inclination light including light inclined at a largest angle with respect to the optical axis in a plan view. The reflecting portion is arranged opposite the light receiving surface and reflects the maximum inclination light from the light receiving surface toward the non-light exit portion.