Backlight Module Flexible Circuit Board Positioning
Solution Overview
Problem
Existing backlight modules face challenges in accurately positioning light bars due to fluctuations in the opening size of the U-shaped slot, leading to light leakage and non-uniform brightness caused by mismatched light-emitting surfaces.
Innovation Solution
A backlight module design featuring a backplane with an arc-shaped side plate forming a U-shaped slot, a light guide plate, and a light bar assembly with a flexible circuit board and light-emitting component, where the flexible circuit board is attached to the counter plate using fixing adhesive tape, allowing for upside-down assembly and accommodating size fluctuations to prevent drooping and ensure proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the opening size of the U-shaped slot is strictly controlled, then the positioning precision of the light bar is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the parameter of the U-shaped slot from a fixed, precisely controlled opening to a flexible structure with a flexible side plate that can adapt to size fluctuations. This parameter change allows the slot to accommodate variations without requiring strict manufacturing tolerances, thus improving positioning precision while reducing manufacturing complexity.
Solution Approach 2:
The patent introduces a flexible side plate that can dynamically adjust to accommodate size fluctuations in the U-shaped slot. This dynamic structure allows the slot to self-adjust and maintain proper light bar positioning even when the opening size varies, eliminating the need for strict manufacturing control while preserving positioning precision.
2Ease of manufacture
If the light-emitting component is attached directly to the counter plate, then the assembly process is simplified, but light leakage occurs due to drooping
Solution Approach 1:
The patent introduces a light guide plate as an intermediary between the light-emitting component and the counter plate. The light guide plate is attached to the counter plate, while the light-emitting component is positioned against its side surface. This intermediary structure prevents direct attachment that causes drooping, eliminates light leakage, and maintains assembly simplicity.
Solution Approach 2:
The patent changes the attachment geometry from a direct vertical attachment (prone to drooping) to a positional relationship where the light-emitting component is attached to the side surface of the light guide plate. This dimensional change in the attachment approach prevents drooping while maintaining assembly ease.
3Stability of the object's composition
If the light bar is positioned to accommodate size fluctuations, then uniform brightness is achieved, but positioning accuracy decreases
Solution Approach 1:
The patent employs a flexible side plate that can dynamically adjust to size fluctuations in the U-shaped slot. This dynamic adjustment mechanism allows the light bar to be positioned accurately relative to the light guide plate while accommodating variations in slot dimensions, thus maintaining both positioning accuracy and uniform brightness.
Solution Approach 2:
The patent changes the rigid positioning parameter to a flexible adaptation mechanism. Instead of requiring precise fixed positioning, the flexible side plate allows the structure to adapt to size fluctuations, maintaining uniform brightness without sacrificing positioning accuracy through elastic deformation and geometric adaptation.
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 accurate positioning of the light bar, prevents light leakage, and maintains uniform brightness by allowing for flexible alignment within the U-shaped slot, even with slight size deviations, thereby improving the assembly process and visual performance.
Implementation Method 1
fixing adhesive tape, located between the counter plate and the flexible circuit board; the flexible circuit board being attached to the counter plate by means of the fixing adhesive tape
Data Source
AI summary
A backlight module includes a backplane, a light guide plate, a light bar assembly, and fixing adhesive tape. The backplane includes a bottom plate, a counter plate and a side plate connected to form an accommodating space. The light guide plate is in the accommodating space. The light bar assembly is in a U-shaped slot of the backplane and comprises a flexible circuit board and a light-emitting component. The flexible circuit board is on a side of the light guide plate facing away from the bottom plate, and the light-emitting component is at a side surface of the light guide plate. The fixing adhesive tape is between the counter plate and the flexible circuit board. The orthographic projection of the fixing adhesive tape on the bottom plate does not overlap the orthographic projection of the light-emitting component on the bottom plate.