Backlight Module T-Shaped Pressure Bar Warping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The assembly of large-sized display panels often results in uneven brightness due to height differences and warping of light plates, which affects the display effect.
Innovation Solution
A backlight module that uses a T-shaped pressure bar to fix assembled light plates to a back plate, ensuring all plates are at the same height and preventing warping, with a fixing portion that covers the gap between plates and includes abutting portions to evenly press the light-emitting surfaces, and optional features like adjustable support columns and buffer members for thermal expansion management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple light plates are assembled and fixed by gluing to the back plate, then the display panel can be manufactured, but height differences and warping occur resulting in uneven brightness
Solution Approach 1:
The pressure bar is divided into a fixing portion and a connecting portion, with the fixing portion extending to form first and second abutting portions that independently press against adjacent light plates. This segmentation allows precise control of pressure distribution across multiple light plates, ensuring they remain at the same height and flat without warping, thereby resolving the brightness uniformity issue while maintaining manufacturing capability.
Solution Approach 2:
The pressure bar serves as a mechanical intermediary between the back plate and multiple light plates. Instead of directly gluing light plates to the back plate, the pressure bar mediates the fixation process by spanning across gaps between light plates and applying uniform pressure through its abutting portions, preventing height differences and warping while enabling assembly of large-sized panels.
2Ease of manufacture
If light plates are fixed by gluing to the back plate, then assembly is achieved, but warping occurs after long time use affecting display effect
Solution Approach 1:
The pressure bar provides dynamic pressure distribution through its abutting portions that contact the light-emitting surfaces of light plates. This mechanical pressure distribution system adapts to thermal expansion and contraction of light plates over time, maintaining consistent contact and preventing warping, thereby ensuring long-term structural stability and brightness uniformity while keeping the assembly process simple.
Solution Approach 2:
The pressure bar changes the fixation parameter from chemical bonding (gluing) to mechanical pressure. By applying controlled mechanical pressure through the abutting portions, the system achieves reliable fixation that prevents warping and maintains brightness uniformity over time, improving long-term reliability while maintaining ease of manufacture through simple assembly.
3Manufacturing precision
If a pressure bar structure is used to fix light plates, then height consistency and flatness are achieved, but device complexity increases
Solution Approach 1:
The pressure bar performs multiple functions simultaneously: it fixes light plates to the back plate, maintains height consistency, prevents warping, and distributes pressure uniformly across light plates. This multi-functionality is achieved through a single integrated structure with a fixing portion and connecting portion, avoiding the need for multiple separate components and reducing overall device complexity while achieving precise light plate alignment.
Solution Approach 2:
The fixing portion and connecting portion of the pressure bar are merged into a single integrated structure. The fixing portion extends from the gap to form abutting portions that contact light plates, while the connecting portion spans the gap. This merging simplifies the fixing structure by combining multiple functions into one component, reducing device complexity while maintaining manufacturing precision for light plate height consistency and flatness.
Data Source
AI summary
A backlight module and a display device are disclosed. The backlight module includes a back plate, an assembled light plate composed of multiple light plates, and a pressure bar. The assembled light plate is fixed to the back plate by the pressure bar. The pressure bar includes a fixing portion and a connecting portion. One end of the connecting portion goes through the gap, and the other end is connected to the fixing portion. The fixing portion extends from the gap to the light plates on both sides to form a first abutting portion and a second abutting portion. The surfaces of the first and the second abutting portions adjacent to the light plates are level and flush with each other. The first and the second abutting portions respectively abut and firmly press the light-emitting surfaces of the light plates on both sides. The fixed portion covers the entire gap.