Edge-lit Backlight Unit Extending Portion for Narrow Frame Bright Lines
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Solution Overview
Problem
Edge bright lines at large viewing angles in display devices with edge-lit backlight units are exacerbated by the structural limitations of the rubber frame and light guide plate, particularly in narrow frame designs, affecting the display's visual quality.
Innovation Solution
The edge-lit backlight unit incorporates an extending portion on the light guide plate that moves its edge outward, overlapping with the rubber frame, which reduces or eliminates edge bright lines by altering the light leakage pattern and improving the display's visibility angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light guide plate edge is positioned close to the visible region to achieve narrow frame structure, then the device compactness is improved, but edge bright lines appear at large viewing angles
Solution Approach 1:
The patent introduces a rubber frame as an intermediary component positioned between the light guide plate edge and the visible region. This rubber frame absorbs and scatters the leaked light that would otherwise create edge bright lines, while allowing the light guide plate edge to remain close to the visible region for narrow frame structure. The rubber frame acts as a mediator that resolves the conflict between compactness and visual quality.
2Object-affected harmful factors
If the rubber frame width is increased to block edge light leakage, then edge bright lines are reduced, but the device complexity and space consumption increase
Solution Approach 1:
The patent optimizes the rubber frame width parameter to a specific range that is sufficient to block edge light leakage but not excessively wide. By carefully selecting and adjusting this dimensional parameter, the solution achieves effective suppression of edge bright lines while maintaining a compact overall device structure and avoiding unnecessary space consumption.
3Object-affected harmful factors
If the light guide plate edge is moved outward to reduce edge bright lines, then viewing angle performance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The rubber frame serves as a positioning intermediary that simplifies the manufacturing process. Instead of requiring precise positioning of the light guide plate edge relative to the visible region, the rubber frame provides a tolerant interface that absorbs positioning variations. This mediator approach reduces the stringency of manufacturing precision requirements while still achieving the goal of minimizing edge bright lines.
Data Source
Figure 1~3a
Figure 3b~6a
Figure 6b~7b
AI summary
An edge-lit backlight unit and a display device are provided. The backlight unit includes a light guide plate (2) and a rubber frame (3), wherein, the light guide plate (2) includes a main body portion (21), the main body portion (21) is of a flat plate structure and includes a first main surface (23) and a second main surface (24) which are opposite to each other and a lateral surface, and the lateral surface includes a first lateral surface portion (28) used as a light incident side and a second lateral surface portion (25) outside the first lateral surface portion (28); the light guide plate (2) further includes an extending portion (22) extending outwards from at least a part of the second lateral surface portion (25) of the main body portion (21), and a thickness of the extending portion (22) is smaller than that of the main body portion (21); and at least a part of the rubber frame (3) and the second lateral surface portion (25) of the main body portion (21) are oppositely arranged at an interval and the at least a part of the rubber frame (3) is at least partially overlapped with the extending portion in the thickness direction of the main body portion. With the above backlight unit, the phenomenon of the edge bright lines at a large viewing angle of a display device can be effectively relieved.