Light Guide Unit with Rounded Corners for Backlight Leakage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing light guide units for point light sources in display devices suffer from inefficient light usage, leading to excessive power consumption and reduced display quality due to light leakage through side surfaces, particularly when multiple LEDs are used, causing luminance non-uniformity and waste of emitted light.
Innovation Solution
A light guide unit design featuring a light incident portion with an optical pattern, a first reflecting portion, and a second reflecting portion with rounded surfaces, which diffuses and reflects light to minimize leakage by increasing the exit angle and ensuring total reflection within the unit, thereby guiding light efficiently to the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LEDs are disposed on the light incident portion to increase illumination, then the luminance of the display panel is improved, but light leakage through side surfaces increases and luminance uniformity deteriorates
Solution Approach 1:
The light guide unit employs rounded corner portions instead of sharp corners at the intersections of side surfaces and the light incident portion. This curvature design modifies the light reflection paths, enabling total internal reflection to occur more effectively and preventing light leakage through the side surfaces, thereby resolving the contradiction between increased illumination and reduced light loss.
Solution Approach 2:
The invention changes the geometric parameters of the light guide unit by introducing rounded corners with specific radii. This parameter modification alters the critical angle conditions for total internal reflection, ensuring that light rays reflected at the corner portions remain within the light guide unit rather than leaking out, thus improving light efficiency while maintaining high luminance.
2Illumination intensity
If multiple LEDs are disposed on the light incident portion, then illumination is improved, but luminance uniformity across the display panel deteriorates
Solution Approach 1:
The rounded corner portions uniformly distribute light reflection paths throughout the light guide unit. By eliminating sharp corners that create concentrated light paths, the curvature design ensures more uniform light distribution across the entire display panel, resolving the luminance uniformity issue while maintaining high illumination levels from multiple LEDs.
3Stability of the object's composition
If the light incident portion is disposed apart from the display section to improve luminance uniformity, then the light guide unit requires a larger area, but the display device thickness and volume increase
Solution Approach 1:
The rounded corner portions enable the light incident portion to be positioned closer to the display section by improving light containment efficiency. The curvature design prevents light leakage, allowing the light guide unit to maintain compact dimensions while still achieving uniform light distribution, thus reducing the required area without compromising 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
The design reduces light leakage, enhances luminance uniformity, and decreases power consumption by effectively directing light to the display panel, thereby improving the overall quality and efficiency of the backlight assembly and display device.
Implementation Method 1
a light incident portion where a light emitted from the point light source enters, the light incident portion including an optical pattern that diffuses an incident light
Implementation Method 2
a first reflecting portion reflecting a first light of the incident light entered through the light incident portion
Implementation Method 3
a second reflecting portion roundly connecting the first reflecting portion to the light incident portion and reflecting a second light of the incident light
Data Source
AI summary
A light guide unit for a point light source includes a light incident portion, a first reflecting portion and a second reflecting portion. The light emitted from the point light source enters to the light incident portion. The light incident portion includes an optical pattern diffusing an incident light corresponding to the point light source. The first reflecting portion reflects a first light of the incident light. The second reflecting portion roundly connects the first reflecting portion to the light incident portion and reflects a second light of the incident light.