Display Device Reflective Sheet Fixing via Wiring Board Sandwich
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Solution Overview
Problem
Conventional display devices with direct backlights face challenges in optical layout flexibility and increased manufacturing costs due to the need for a holder that protrudes and complicates the placement of LEDs, limiting light transmission and requiring costly assembly methods.
Innovation Solution
A display device design featuring a reflective sheet with openings for the wiring board and using double-sided adhesive tape to fix the wiring board to the rear frame, eliminating the need for a conventional holder and allowing greater flexibility in LED placement while maintaining efficient light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional holder with hold-down component is used to prevent sagging of the reflective sheet, then the reflective sheet is fixed properly, but the hold-down component protrudes and blocks light from LEDs, reducing optical layout flexibility
Solution Approach 1:
The invention extracts the light-blocking hold-down component from the system by eliminating the conventional holder entirely. Instead, the reflective sheet is fixed by sandwiching it between the rear frame and the wiring board, with the holding component integrated into the wiring board structure rather than protruding outward. This removes the obstruction to light while maintaining fixing stability.
Solution Approach 2:
The invention changes the fixing approach from a protruding three-dimensional hold-down component to a planar sandwiching structure. The reflective sheet is clamped between two flat surfaces (rear frame and wiring board) in the thickness direction, eliminating the need for lateral protrusions that would block light paths and improve optical layout flexibility.
2Reliability
If a conventional holder with sandwiching component is used to fix the wiring board and reflective sheet, then the assembly is secured, but the device complexity and manufacturing cost increase
Solution Approach 1:
The invention merges the holding function into the wiring board itself. The wiring board serves dual purposes: as the electrical substrate for LEDs and as the structural component that sandwiches the reflective sheet against the rear frame. This eliminates the need for a separate holder assembly, reducing device complexity while maintaining assembly stability.
Solution Approach 2:
The wiring board is given multiple functions: it serves as the electrical circuit substrate, the structural support for the reflective sheet, and the clamping component that secures the assembly. This multi-functionality eliminates the need for dedicated holder components, simplifying the overall device structure.
3Ease of manufacture
If double-sided adhesive tape is used to fix the wiring board to the rear frame, then the manufacturing cost is reduced and assembly is simplified, but the fixing strength may be insufficient under thermal expansion
Solution Approach 1:
The invention applies local quality by using double-sided adhesive tape only at specific locations where thermal expansion occurs, rather than across the entire surface. This targeted approach provides sufficient fixing strength at critical points while maintaining ease of manufacture and allowing thermal movement in non-critical areas.
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 design enhances optical layout flexibility and reduces manufacturing costs by preventing light obstruction and allowing efficient heat dissipation, maintaining the rear frame temperature within standard limits.
Implementation Method 1
The double-sided adhesive tape is affixed to the entire rear face of the wiring board
Implementation Method 2
a reflective sheet for reflecting the light from the LEDs toward the rear face of the liquid crystal cell
Implementation Method 3
a plurality of LEDs (light emitting diodes) that are mounted on the front side of the wiring board
Data Source
AI summary
A display device includes a display panel, a rear face housing, a light source unit, a reflective sheet, and a fixing member. The rear face housing is disposed rearward with respect to a rear face of the display panel. The light source unit is disposed between the display panel and the rear face housing. The reflective sheet has an opening. A portion of the reflective sheet around the opening is disposed between at least part of the light source unit and the rear face housing in a direction perpendicular to a surface of the display panel. The fixing member attaches the light source unit to the rear face housing.