Backlight Unit Inclined Light Source Edge Illumination
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Solution Overview
Problem
Edge-illumination type backlight units in display apparatuses face challenges in preventing light leakage while improving light incident efficiency from the light source to the light guide plate.
Innovation Solution
The backlight unit incorporates a light source unit with an emitting surface inclined relative to the incident surface of the light guide plate, ensuring that light is incident into the plate while being directed towards the opposite surface, thereby reducing direct emission to the display panel and enhancing light incident efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the light source is positioned adjacent to the edge of the light guide plate, then the light can be supplied toward the light guide plate, but light leakage occurs and light incident efficiency is reduced
Solution Approach 1:
The emitting surface of the light source is designed to be inclined relative to the incident surface of the light guide plate, creating an asymmetric configuration. This asymmetric positioning and angular orientation ensures that light is directed toward the opposite surface of the light guide plate rather than leaking directly toward the display panel, thereby improving light incident efficiency while preventing light leakage.
Solution Approach 2:
The solution introduces a dimensional change by inclining the emitting surface at a specific angle rather than positioning it parallel to the incident surface. This angular adjustment in a different dimensional orientation redirects the light path through the light guide plate, converting direct emission toward the display panel into guided transmission through the plate, thus resolving the contradiction between preventing light leakage and improving incident efficiency.
2Ease of manufacture
If the emitting surface is positioned parallel to the incident surface, then the structure is simple, but light leaks directly to the display panel reducing efficiency
Solution Approach 1:
The emitting surface is designed with an inclined configuration relative to the incident surface, breaking the parallel symmetry. This asymmetric design, while slightly more complex than a parallel arrangement, ensures that light is directed toward the opposite surface of the light guide plate, significantly improving light incident efficiency by preventing direct leakage to the display panel.
Solution Approach 2:
The solution changes the geometric parameter of the emitting surface orientation from parallel to inclined at a specific angle. This parameter adjustment modifies the light emission direction, ensuring that light trajectories are directed toward the opposite surface of the light guide plate rather than leaking directly to the display panel, thereby improving light incident efficiency.
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 effectively reduces light leakage and improves the light incident efficiency by ensuring that more light is guided through the light guide plate, resulting in enhanced display performance.
Implementation Method 1
a light guide plate (10) having an incident surface (12A, 12B, 17A, 17B), an exit surface (13, 18) and an opposite surface (14, 19) opposite to the exit surface (13, 18), and guiding a light (L) incident into the incident surface (12A, 12B, 17A, 17B) toward the exit surface (13, 18)
Data Source
AI summary
A display apparatus includes a light guide plate, a light source unit and a display panel. The light guide plate includes an incident surface, an exit surface and an opposite surface opposite to the exit surface and guides a light incident into the incident surface toward the exit surface. The light source unit includes a light source which generates light and is disposed adjacent to the incident and has an emitting surface inclined with respect to the incident surface. An extension line of a normal line of the emitting surface passes through the opposite surface, and the light is incident into the incident surface while being inclined toward the opposite surface. The display panel displays an image by receiving the light emitted from the exit surface.