Backlight Module Optical Film Interference Fit for Narrow Bezel
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Solution Overview
Problem
In-vehicle backlight modules face issues with bright edges and fluorescence due to insufficient space for optical film expansion and the use of flexible printed circuit sides, which affects reliability and display performance.
Innovation Solution
A backlight module design featuring a backplate with block walls, a light bar, and optical films where the frame's pressing surface is adhesively attached to the optical film using an adhesive layer with a protrusion, providing an interference fit and a light-shielding elastic fixing member to manage heat expansion and reduce reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If projection stages are provided on light guide plates to fix optical films, then reliability is improved, but space for expansion and contraction of optical films becomes insufficient
Solution Approach 1:
The patent transitions from fixing optical films on the light guide plate (one dimension) to fixing them on the frame (another dimension). The frame is positioned away from the light guide plate, creating a different spatial plane for film fixation. This dimensional shift allows the optical films to expand and contract along the light guide plate while being securely fixed to the frame, resolving the contradiction between fixation reliability and expansion space.
2Reliability
If projection stages are provided on relatively wide lower sides of frames (FPC sides), then fixation is achieved, but bright edges and fluorescence phenomenon occur
Solution Approach 1:
The patent applies local quality by positioning the projection stages on specific portions of the frame that are away from the FPC sides. Instead of uniformly distributing fixation points, the design selectively places them on the frame's upper or side portions, avoiding the problematic FPC regions. This localized approach maintains fixation reliability while eliminating the bright edges and fluorescence phenomenon that occur when films are fixed on FPC sides.
3Ease of manufacture
If double-sided tapes are used to attach optical films to light guide plates, then assembly is simplified, but heat expansion and contraction causes reliability issues
Solution Approach 1:
The patent segments the fixation function from the heat expansion function. The optical films are attached to the light guide plate using double-sided tapes, allowing free heat expansion and contraction. Simultaneously, the films are fixed to the frame using projection stages, providing stable positioning. This segmentation allows the films to thermally expand along the light guide plate while maintaining reliable fixation through the separate frame attachment points.
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 ensures reliable attachment of optical films, eliminates bright edges and fluorescence, and facilitates a narrow bezel design by concentrating heat changes and shielding light sources, enhancing the reliability and performance of in-vehicle backlight modules.
Implementation Method 1
an interference fit is provided between the adhesive layer and the first optical film
Data Source
AI summary
A backlight module and a liquid crystal display device are disclosed. The backlight module includes a backplate, a light bar, a first optical film, a frame, and an adhesive layer. By an arrangement of a corresponding optical film adhesively attached to a side of the frame opposite to the light bar through the adhesive layer, heat changes of the corresponding optical film are concentrated on one side of the light bar, which facilitates fulfillment of reliable attachment of the corresponding optical film and narrow bezel design of in-vehicle backlight modules, as well as eliminating or mitigating problems of bright edges and a fluorescence phenomenon in the backlight modules.