Light Guiding Unit Curved Surface for Display Hotspot Reduction
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Solution Overview
Problem
Conventional light guiding units in display devices often suffer from hotspot issues due to the planar light input surface, leading to reduced luminous efficiency and display quality, especially when light from LEDs enters the system.
Innovation Solution
The introduction of a light guiding unit with a modified light input surface featuring protruding portions or regions of varying surface roughness, which redirects light further away from the light-emitting unit, enhancing luminous efficiency and mitigating hotspot issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a planar light input surface is used in the light guiding plate, then the structure is simple and easy to manufacture, but hotspots are generated around the light input surface due to LED pitch, affecting luminous efficiency and display quality
Solution Approach 1:
The patent introduces a curved connecting surface that protrudes along the second direction, replacing the planar light input surface. This curved surface redirects light entering the light guiding plate, causing it to travel further before reaching the display panel, thereby reducing hotspot formation while maintaining manufacturing feasibility through molding processes
2Reliability
If the light input surface is modified with protruding portions or varying surface roughness, then luminous efficiency and display quality are improved by reducing hotspots, but the structure becomes more complex
Solution Approach 1:
The patent applies local quality by creating a connecting surface with specific curvature characteristics in a particular region of the light guiding plate. The curved surface protrudes along the second direction with controlled radius of curvature, modifying light redirection properties only where needed near the light input surface while keeping the rest of the light guiding plate structure simple
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 significantly improves the luminous efficiency of the backlight module and display quality by effectively guiding light away from the light-emitting unit, reducing hotspots and enhancing overall illumination uniformity.
Implementation Method 1
the light can be outputted from a light output surface of the light guiding plate based on the total reflection of the light guiding plate
Data Source
AI summary
A backlight module includes a light guiding unit having a light input surface and a light-emitting unit having light-emitting elements disposed along a first direction and adjacent to the light input surface. A second direction is from the light input surface to the light-emitting unit. A first protruding portion of the light guiding unit includes a sharp protrusion tip at the bottom surface and a part of the light input surface. A curved convex connecting surface of the light input surface connects to the first protruding portion to form a turning portion which is disposed between the connecting surface and the first protruding portion, and is at its intermediate portion and outwardly protrudes toward the light-emitting elements along the second direction. The light-emitting elements are across from the connecting surface and generally positioned above the first protruding portion in the third direction.