Backlight Unit Light Guide Plate Protrusion Design
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Solution Overview
Problem
Conventional backlight units face limitations in reducing the size of light emitting diodes while minimizing the thickness of the light guide plate, leading to light leakage and inefficiency in display apparatuses.
Innovation Solution
A backlight unit design featuring a light guide plate with a polygonal exit surface, a protrusion with specific inclination surfaces, and a reflective member to enhance light efficiency by redirecting leaked light, allowing for a more compact display apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of light emitting diode is reduced, then the thickness of the light guide plate can be reduced, but light leaks without being incident to the light guide plate
Solution Approach 1:
The invention converts the harmful light leakage into beneficial light utilization by introducing a reflective member that redirects the leaked light onto the light guide plate. The reflective member transforms what would be wasted light into useful light that can be guided to the display panel, thereby improving overall light efficiency while maintaining the reduced thickness design.
Solution Approach 2:
The invention adds a new dimensional element by introducing a reflective member positioned at a different spatial location and orientation. This reflective member creates an additional light path dimension, allowing light to be redirected from the leakage direction back onto the light guide plate, effectively utilizing space in a new dimension to solve the light loss problem.
2Volume of moving object
If the size of light emitting diode is reduced, then the display apparatus can be slimmed, but light efficiency decreases
Solution Approach 1:
The reflective member converts the previously wasted leaked light into useful illumination by redirecting it onto the light guide plate. This transformation improves light efficiency without requiring an increase in the size of the light emitting diode or the overall display apparatus volume.
Solution Approach 2:
The invention changes the optical parameters of the system by introducing a reflective member with specific reflectivity characteristics. This parameter change redirects light paths and improves the overall light efficiency of the display apparatus while maintaining the compact design with reduced volume.
3Volume of moving object
If the thickness of light guide plate is reduced, then the display apparatus becomes more compact, but light control becomes difficult
Solution Approach 1:
The reflective member acts as an intermediary element that facilitates light control in the thinned light guide plate structure. By positioning the reflective member to redirect leaked light back onto the light guide plate, it mediates the light path control without requiring complex internal structures within the light guide plate itself, thus maintaining simplicity despite the reduced thickness.
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 improves light efficiency and reduces the volume of the display apparatus by effectively redirecting and utilizing otherwise lost light, enhancing the overall performance of the backlight unit.
Implementation Method 1
the reflective member reflects the light emitted from the light source to the light guide plate
Implementation Method 2
The light guide plate guides a light such that the light exits from the exit surface
Data Source
AI summary
A backlight unit includes a light guide plate and a light source unit. The light guide plate includes an exit surface which has a polygonal shape, a lower surface which faces the exit surface, and side surfaces which connect the exit surface and the lower surface. The light guide plate guides a light such that that light exits from the exit surface. The light source unit includes a plurality of light sources which provide the light to the light guide plate. The light guide plate includes a protrusion which protrudes from an end of the lower surface in a direction opposite to the exit surface. The protrusion includes a first inclination surface which is connected to one of the side surfaces, and a second inclination surface which connects the first inclination surface and the lower surface to each other.