Backlight Unit Support Pin Design for LED Wiring and Light Transmission
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Solution Overview
Problem
In direct type backlight units using a matrix of LEDs as light sources, the conventional support pin design hinders light transmission and restricts wiring freedom due to its positioning between the LEDs, making it difficult to position the pillar and fixation portions far enough apart from the LEDs.
Innovation Solution
A support pin design with a first fixation portion positioned apart from the LEDs, a second fixation portion positioned outside the LED matrix, and a pillar aligned perpendicular to the substrate, allowing for increased spacing between the fixation portions and LEDs, thereby enhancing wiring freedom and preventing light obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the pillar is positioned close to the LED's, then the support pin provides adequate support structure, but the pillar hinders the proceeding of light from the LED's
Solution Approach 1:
The support pin utilizes the vertical dimension (perpendicular to the substrate) to position the pillar above the LED array rather than placing it within the planar space occupied by LEDs. This dimensional transition allows the pillar to provide structural support without obstructing light propagation in the horizontal plane.
Solution Approach 2:
The support pin is divided into distinct functional segments: fixation portions for mounting and a pillar for support. By separating these functions spatially, the fixation portions can be positioned away from LEDs while the pillar extends vertically to provide support without interfering with light paths.
2Ease of operation
If the fixation portions are positioned far apart from the LED's, then wiring freedom is improved, but the pillar positioned near the LED's hinders light transmission
Solution Approach 1:
The pillar is positioned in the vertical dimension above the LED array, allowing fixation portions to be spaced apart in the horizontal plane for wiring freedom while the pillar remains out of the light path through dimensional separation.
3Device complexity
If the pillar is formed at the middle position between the two fixation portions, then the support pin structure is simplified, but the arrangement causes the pillar to be positioned near the LED's
Solution Approach 1:
The pillar is repositioned from a horizontal middle location between fixation portions to a vertical position above the LED array. This dimensional change allows the pillar to maintain structural centrality while avoiding proximity to LEDs that would obstruct light.
Data Source
AI summary
A backlight unit comprises a circuit board (20) having, a plurality of LED's (22) arranged in a matrix, a diffuser panel (62), and a support pin (50) positioned between the circuit board (20) and the diffuser panel (62) for supporting the diffuser panel (62). The support pin (50) includes a first fixation portion (51) inserted in a hole (21) formed on the circuit board (20), a second fixation portion (52) positioned apart from the first fixation portion (51), and a pillar (53) having a tip end supporting the diffuser panel (62). The pillar (53) and the first fixation portion (51) are aligned in a direction perpendicular to the circuit board (20). According to this backlight unit, it is possible to ensure freedom in wiring around the LED's (22) and to prevent the pillar (53) of the support pin (50) from hindering the light.