Backlight Reflection Member Corner Brightness
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Solution Overview
Problem
Existing backlight units for liquid crystal display devices face issues with uneven brightness, particularly at the corners, due to light leakage through gaps at the joints of raised portions in the reflection member, leading to increased manufacturing costs when trying to compensate with more LEDs.
Innovation Solution
The design includes a reflection member with quadrangular bottom portions and raised portions that form joints, where the side edges of one raised portion have facing portions to apply stress and prevent deformation, ensuring light is directed efficiently without leakage, and allows for the use of general-purpose LED boards without the need for dedicated arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of LEDs is increased in the vicinity of the corners to compensate for light shortage, then the light amount at the corners is improved, but the manufacturing cost is increased
Solution Approach 1:
The reflection member is designed with non-uniform geometry, featuring raised portions at the corners and side edges that create localized light concentration zones. This allows the same LED arrangement to provide enhanced illumination at corners through the reflective geometry rather than increasing LED quantity, resolving the contradiction between corner brightness and manufacturing cost.
Solution Approach 2:
The reflection member acts as an intermediary element between the LEDs and the display screen. By strategically positioning raised portions and side edges, it redirects and concentrates light from the LED array toward the corners, effectively distributing light uniformly without requiring additional LEDs in corner regions.
2Illumination intensity
If LEDs are arranged in a disproportional manner on a dedicated LED board to change the number of LEDs depending on positions, then the light distribution is improved, but the manufacturing cost is increased
Solution Approach 1:
The reflection member with its raised portions and side edges serves multiple functions simultaneously: it reflects light, concentrates light at corners, and distributes light uniformly across the display surface. This single component achieves what would otherwise require complex LED positioning patterns, allowing the use of standard LED boards with uniform LED spacing.
Solution Approach 2:
Instead of changing the positional parameters of LEDs (which would require dedicated boards), the invention changes the geometric parameters of the reflection member. By adjusting the height, position, and shape of raised portions and side edges, the light distribution is optimized while maintaining standard LED board configurations.
3Device complexity
If the raised portions are made without facing portions to simplify the structure, then the device complexity is reduced, but light leakage occurs through gaps at the joints
Solution Approach 1:
The facing portions are designed to apply preliminary stress to the raised portions during assembly, pre-compressing the joints between adjacent raised portions. This preliminary action prevents gap formation during operation, ensuring light-tight joints without requiring complex sealing mechanisms or increasing overall structural complexity.
Solution Approach 2:
The facing portions create a preliminary counteracting force that prevents the natural tendency of raised portions to separate or deform away from each other. By designing the facing portions to push adjacent raised portions together, the structure proactively counteracts potential light leakage paths before they can form.
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 suppresses uneven brightness at low cost by preventing light leakage through joints and reducing the number of LEDs required, while maintaining high brightness and power efficiency.
Implementation Method 1
a reflection member configured to reflect light and including a quadrangular bottom portion and at least two raised portions
Data Source
AI summary
A backlight unit includes: an LED; a chassis including a bottom plate provided on a side opposite to a light exit side; and a first reflection sheet. The first reflection sheet includes a quadrangular bottom portion extending along the bottom plate, and two raised portions raised from each of two adjacent sides of the quadrangular bottom portion toward the light exit side, a joint provided between two adjacent side edges of the raised portions. The side edge of a first one of the raised portions includes a facing portion facing the side edge of a second one of the raised portions in a direction in which the first one of the raised portions is raised from the quadrangular bottom portion, and the first one of the raised portions and facing portion bulge toward the light exit side to have an arched shape.