Backlight Module Recessed Light Source for Leakage Control
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Solution Overview
Problem
The thinning of light guides in backlight modules leads to light leakage between the light source and the light guide, resulting in decreased illumination efficiency and uniformity, as the light inputting surface is smaller than the light emitting surface.
Innovation Solution
A backlight module design featuring a bottom plate with a recess and an inclined reflective surface, where the light source assembly is positioned inside the recess, allowing the light emitting surface to be aligned below the light outputting surface of the light guide, and microstructures on the reflective surface to redirect leaked light, enhancing light utilization and reducing hotspot effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the thickness of the light guide is reduced to meet consumer demand for thinner devices, then the overall device thickness is reduced, but the light inputting surface becomes smaller than the light emitting surface causing light leakage
Solution Approach 1:
The light source assembly is nested within the recess formed in the bottom plate, allowing the light emitting surface to extend beyond the light inputting surface while maintaining a compact overall structure. This nesting arrangement enables the light guide to be thinner without causing light leakage.
Solution Approach 2:
The invention transitions from a planar arrangement to a three-dimensional structure by forming a recess in the bottom plate and positioning the light source assembly within it. This dimensional change allows the light emitting surface to be larger than the light inputting surface while preventing light leakage through proper spatial arrangement.
2Length of stationary object
If the thickness of the light guide is reduced, then the device becomes thinner, but the illumination uniformity decreases due to light leakage
Solution Approach 1:
The light source assembly is nested within the recess, creating a controlled three-dimensional space that ensures uniform light distribution across the light guide while maintaining thin overall device profile.
Solution Approach 2:
By introducing vertical dimensionality through the recess structure, the invention achieves better illumination uniformity despite the reduced light guide thickness, as the light source is positioned to optimally illuminate the entire light guide surface.
3Length of stationary object
If the light inputting surface is made smaller to reduce device thickness, then the device becomes thinner, but the illumination efficiency decreases
Solution Approach 1:
The light source assembly is nested within the recess, allowing the light emitting surface to be larger than the light inputting surface while maintaining efficient light coupling. This arrangement improves illumination efficiency by ensuring that more light from the source enters the light guide.
Solution Approach 2:
The three-dimensional recess structure enables the light source to be positioned such that its emitting surface extends beyond the light inputting surface in the horizontal direction while maintaining close proximity in the vertical direction, thereby improving light coupling efficiency despite the smaller input surface area.
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 increases illumination efficiency by 9% and improves light uniformity by 40% compared to traditional designs, effectively addressing the issue of light leakage and enhancing brightness.
Implementation Method 1
The recess comprises a second loading surface and a reflective surface. The reflective surface is located between the first loading surface and the second loading surface. The reflective surface is inclined to the first loading surface and the second loading surface.
Data Source
AI summary
A backlight module includes a bottom plate, a light guide and a light source assembly. The bottom plate has a first loading surface and a recess adjacent to each other. The recess has a second loading surface and a reflective surface inclined to the first and second loading surfaces. The light guide has a light inputting surface and a light outputting surface. The light guide is disposed on the first loading surface and covers the reflective surface. The light outputting surface faces away from the bottom plate. The light source assembly has a light emitting surface and disposed on the second loading surface. The light emitting surface faces the light inputting surface and the reflective surface, and comprises a side edge away from the second loading surface. The light source assembly is disposed inside the recess so the side edge is not higher than the light outputting surface.