Backlight Module Reflection Member for Uniform Light Distribution
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Solution Overview
Problem
Traditional side-type backlight modules suffer from low light utilization and uneven light intensity due to a large gap between the LED light bar and the light guide plate, leading to brightness loss and hot spots.
Innovation Solution
A reflection member is positioned outside the gap between the LED light bar and the light guide plate, with varying reflective indices in different regions to optimize light reflection, ensuring even light distribution and reducing hot spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a large gap is maintained between the LED light bar and the light guide plate for thermal management, then heat dissipation is improved, but light utilization rate decreases and brightness loss occurs
Solution Approach 1:
A reflection member is introduced as an intermediary component positioned between the LED light bar and the light guide plate. This reflection member redirects light that would otherwise escape through the gap back onto the light guide plate, thereby improving light utilization without requiring a reduction in the gap size for thermal management.
Solution Approach 2:
The reflection member is divided into multiple regions with different reflective indices: a first region corresponding to LED lamp positions with a first reflective index, and a second region corresponding to interval positions with a second reflective index. This segmentation allows optimized light reflection at different locations to simultaneously address heat dissipation and light utilization requirements.
2Temperature
If LED lamps are arranged at intervals on the PCB plate, then heat dissipation and electrical isolation are improved, but uneven light intensity and hot spots are caused
Solution Approach 1:
Different regions of the reflection member are assigned different reflective properties: the first region under LED lamps has a first reflective index, while the second region at interval positions has a second reflective index. This local differentiation compensates for the gaps between LED lamps by reflecting more light at interval positions, thereby achieving uniform light intensity distribution while maintaining the intervalled LED arrangement for heat dissipation.
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 light utilization and achieves even light intensity by effectively reflecting light at intervals and edges of the LED light bar onto the light guide plate, minimizing brightness loss and hot spots.
Implementation Method 1
A reflection member is positioned outside the gap between the LED light bar and the light guide plate, with varying reflective indices in different regions to optimize light reflection
Data Source
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AI summary
The present invention provides a backlight module and a display device, comprising: a light guide plate (100) including a light-entering surface (101), a light-exiting surface (102) and a back surface (103); a LED light bar (200) including a plurality of LED lamps (201) arranged at intervals, the LED light bar being arranged at a side of the light guide plate so as to emit the light to the light-entering surface of the light guide plate, and a gap (G) being provided between the LED light bar and the light guide plate; and a reflection member (400) arranged outside the gap, a reflection surface of the reflector facing the gap so as to reflect the light from the LED light bar toward the light-entering surface of the light guide plate, wherein first regions (4001) and second regions(4002) are arranged on the reflection surface of the reflection member at intervals, a position of the first region corresponds to a position of the LED lamp, a position of the second region corresponds to a position of a interval between the plurality of LED lamps and/or a position outside the LED lamps at the end of the LED light bar, and the first region has a reflectivity less than the second region. According to the present invention, it is able to appropriately reduce the difference between the intensity of the incident light at the intervals between the LED lamps and the intensity of the incident light at the LED lamps, thereby to achieve even light intensity and reduce hot spots.