Backlight Module Compensation Light Structure for LED Gap Hotspots
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Solution Overview
Problem
Current backlight module designs suffer from hotspots and poor optical performance due to insufficient light distribution caused by gaps between light-emitting diodes (LEDs) in the light source layer, leading to inadequate light injection into the light guide plate.
Innovation Solution
A compensation light structure is introduced, comprising a semi-convex lens with a curved side and a planar side, a light transmissive layer, and a reflective layer, positioned at the gaps between LEDs to collect and redirect light, ensuring uniform light distribution across the light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light bar is composed of multiple single packaged LEDs with gaps between them, then the device complexity is reduced and ease of manufacture is improved, but light distribution uniformity deteriorates and hotspots occur
Solution Approach 1:
A light transmissive layer is introduced as an intermediary component between the LED light sources and the light guide plate. This layer includes a reflective layer and optional light-transmitting particles that mediate light distribution, reflecting light from LED gaps toward the light guide plate and reducing hotspot formation while maintaining the simple LED array structure
Solution Approach 2:
The light transmissive layer is specifically positioned at gap regions between LEDs where light deficiency occurs. The reflective layer and light-transmitting particles are locally distributed to address the specific light distribution problem at LED gaps, providing enhanced light redirection precisely where needed without modifying the entire light bar structure
2Length of stationary object
If the distance between the light incident side and visible area is smaller than the light mixing distance, then the device thickness is reduced, but optical performance deteriorates due to hotspots
Solution Approach 1:
The light transmissive layer performs preliminary light redistribution at the light incident side before light enters the light guide plate. By pre-reflecting and redirecting light from LED gaps in the light transmissive layer, the system compensates for insufficient light mixing distance, ensuring uniform light distribution is achieved even in thin display devices
Solution Approach 2:
The patent replaces the reliance on long light mixing distances (mechanical/spatial solution) with an optical solution using the light transmissive layer's reflective and light-transmitting properties. This substitution allows thin device design while maintaining optical performance through optical field manipulation rather than spatial extension
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 compensation light structure effectively addresses the issue of insufficient light at gaps, enhancing the optical performance of the display device by ensuring better light transmission and reducing hotspots.
Implementation Method 1
the compensation light structure includes at least one semi-convex lens having a curved side and a planar side... the curved side faces the light incident side of the light guide plate
Implementation Method 2
the compensation light structure further includes a reflective layer disposed between adjacent semi-convex lenses and attached to the light transmissive layer
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes a back plate, a light source layer, a light guide plate, and an optical film. By providing a compensation light structure between backlights, issues of insufficient light at a gap can be better compensated, and an optical performance of the display device can be improved.