Direct-Lit Mini LED Backlight Optical Film Fixing Mechanism
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Solution Overview
Problem
Current display panels with direct-lit backlight modules face issues with optical films being easily displaced and scratched due to the lack of a fixed mechanism, leading to abnormal noise and reliability concerns during vibration tests.
Innovation Solution
A display panel design incorporating a frame with an optical film group and a fixing block, where one end of the fixing block is connected to the frame and the other end is pressed on the optical film group, limiting movement and preventing displacement and scratches through a combination of a positioning column and a pressing effect from the fixing block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-lit backlight module is adopted instead of an edge-lit backlight module, then the local dimming function and ultra-high contrast are achieved, but the optical film cannot be fixed normally leading to displacement and scratches
Solution Approach 1:
The frame is divided into an inner frame and an outer frame, with the inner frame providing positioning columns and the outer frame providing fixing blocks. This segmentation allows different parts of the frame to perform different functions: the inner frame positions the optical film group while the outer frame secures it firmly, solving the fixation problem in direct-lit backlight modules
Solution Approach 2:
Positioning columns are pre-installed on the inner frame before the optical film group is assembled. These positioning columns protrude upward to engage with positioning holes in the optical film group, establishing preliminary positional relationships that prevent displacement during subsequent assembly and operation
2Ease of manufacture
If a diffuser plate is adopted instead of a light guide plate in direct-lit backlight module, then the optical structure is optimized, but the boss structure for fixing optical film is lost
Solution Approach 1:
Since the diffuser plate itself cannot provide fixation structures, intermediary components are introduced: positioning columns on the inner frame and fixing blocks on the outer frame. These intermediaries bridge the gap between the diffuser plate structure and the optical film fixation requirement, allowing the optical film to be secured without modifying the diffuser plate
3Productivity
If optical films are not fixed in backlight modules, then the assembly process is simplified, but abnormal noise and scratches occur during vibration tests
Solution Approach 1:
The positioning columns and fixing blocks are designed to automatically engage with the optical film group during assembly. The positioning columns insert into positioning holes to establish position, and the fixing blocks press down to secure the film, creating a self-fixing mechanism that maintains reliability without complex additional fixation steps
Data Source
AI summary
The present application provides a display panel and an electronic device. The electronic device includes a display panel. The display panel includes a backlight module. The backlight module includes a frame, an optical film group, and a fixing block. Movements of the optical film group can be limited in a thickness direction of the display panel by pressing the fixing block on the optical film group. Therefore, optical films can be fixed, so problems of abnormal noise, displacement, and scratches of the optical films in the display panel adopting a direct-lit mini light-emitting diode (LED) light source are prevented.