Light Mixing Chamber for LCD Backlight Hotspot Reduction
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Solution Overview
Problem
Backlights used in liquid crystal displays (LCDs) with LEDs suffer from reduced effectiveness, output, and brightness due to light diffusion and reflection during transmission from the LED to the light guide plate.
Innovation Solution
A light mixing chamber with a housing containing a channel and chamber, an optical member, and an aperture connecting the chamber to the channel, which improves light collimation and reduces hotspots by directing light efficiently to the light guide plate, while also dissipating heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is transmitted directly from LED to light guide plate, then the structure is simple, but light diffusion and reflection reduce output and brightness
Solution Approach 1:
A light mixing chamber is introduced as an intermediary component between the LED and the light guide plate. The chamber contains an optical member that modifies light properties before transmission, thereby improving brightness without requiring fundamental changes to the overall backlight structure
Solution Approach 2:
The housing is divided into distinct functional zones: a chamber for housing the LED, a channel for light transmission, and a light guide plate positioning area. This segmentation allows each component to perform its specific function optimally while maintaining a relatively simple overall structure
2Manufacturing precision
If light is transmitted directly from LED to light guide plate, then the device is compact, but hotspots and nonconformities occur in the light guide plate
Solution Approach 1:
The optical member positioned within the light mixing chamber serves as a mediator that pre-processes the light before it reaches the light guide plate. This intermediary component ensures uniform light distribution and eliminates hotspots, improving manufacturing precision without significantly increasing structural complexity
Solution Approach 2:
The optical member performs preliminary light modification actions within the chamber before light enters the light guide plate. By pre-collimating and distributing light in the chamber, the system achieves uniform light output without requiring complex post-processing structures
3Productivity
If light is transmitted directly from LED to light guide plate, then heat dissipation is minimal, but heat accumulation reduces efficiency
Solution Approach 1:
The housing structure is segmented into a chamber that houses the LED and a channel that directs light. This segmentation creates physical space for heat dissipation pathways, allowing heat to be managed more effectively while maintaining high backlight efficiency
Solution Approach 2:
The housing structure serves multiple functions: it contains the optical components, directs light transmission, and provides heat dissipation pathways. By making the housing multi-functional, the system improves efficiency and heat management without adding separate dedicated components
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 enhances the output, focus, and efficiency of the backlight by better directing light and reducing nonconformities within the light guide plate, thereby improving the overall performance and reducing heat-related issues.
Implementation Method 1
light can be better collimated or otherwise directed such that the output, focus, and efficiency of the backlight can be improved
Implementation Method 2
The light mixing chamber can also serve to dissipate heat
Data Source
AI summary
A light mixing chamber includes a housing having a channel formed therein, with the channel exposed to an exterior of the housing. A chamber is formed in the housing, and an aperture formed in the housing connects the chamber to the channel. The chamber may house an LED, with an optical member being retained within the channel. A light guide plate may be positioned on an exterior of the housing outside the channel.