Side-edge backlight module trapezoidal positioning slots
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Solution Overview
Problem
Current side-edge backlight modules fail to properly handle thermal expansion and humidity absorption, leading to warping and deformation of the light guide plate, which affects the liquid crystal panel's operation and luminance.
Innovation Solution
The design incorporates trapezoidal positioning slots and rivet pins that allow for controlled expansion of the light guide plate, preventing warping by maintaining a tight engagement and providing specific preserved spaces for thermal expansion, ensuring the light guide plate remains flat and functional in high-temperature and high-humidity environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the light guide plate is fixed rigidly using conventional positioning holes and rivets, then positioning precision is improved, but thermal expansion causes warping and deformation
Solution Approach 1:
The positioning structure transitions from a rigid fixed state to a dynamic adjustable state. The rivet can rotate within the positioning hole, and the positioning slot provides a dynamic range of motion, allowing the light guide plate to expand thermally without generating excessive stress that would cause warping.
Solution Approach 2:
The invention changes the geometric parameters of the positioning structure by introducing a positioning slot with specific dimensions (length and width) that are optimized to accommodate thermal expansion. The slot's dimensions are designed based on the light guide plate's material properties and expected temperature range, allowing controlled movement while maintaining positioning accuracy.
2Stability of the object's composition
If the positioning structure allows thermal expansion space, then warping is prevented, but positioning precision deteriorates
Solution Approach 1:
The positioning function is segmented into two independent components: the positioning hole provides precise lateral positioning, while the positioning slot provides longitudinal expansion space. This segmentation allows each component to optimize its function without interfering with the other, maintaining both precision and stability.
Solution Approach 2:
The positioning slot is designed with asymmetric dimensions where the length is significantly greater than the width. This asymmetric geometry provides ample space for thermal expansion in the longitudinal direction while maintaining tight constraints in the lateral direction, thereby preserving positioning precision while allowing necessary movement.
3Device complexity
If conventional fixing methods are used, then device complexity is reduced, but the structure cannot accommodate humidity absorption and thermal expansion
Solution Approach 1:
The positioning slot serves multiple functions simultaneously: it provides thermal expansion space, accommodates humidity-induced dimensional changes, maintains positioning accuracy, and prevents warping. This multi-functionality eliminates the need for separate expansion joints or adjustment mechanisms, keeping the overall structure simple while greatly enhancing environmental adaptability.
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 solution effectively secures the light guide plate, preventing warping and maintaining its flatness even under thermal expansion, thus ensuring stable operation and luminance of the liquid crystal panel.
Implementation Method 1
When a light guide plate expands, the dimensions thereon in both length and width directions increase. Taking a 55'' light guide plate made of PMMA (Poly(methyl methacrylate)) as an example, when the light guide plate is moved from room temperature (25° C.) into an oven of 40° C., the length increases by 2.8 mm
Implementation Method 2
stability of positioning taking tolerance, thermal expansion, absorption of wet into consideration
Data Source
AI summary
The present invention provides a side-edge backlight module including a light guide plate having first and second mounting sides opposite to each other. The first mounting side forms a first positioning hole, a first positioning slot, and a second positioning slot. The second mounting side forms correspondingly a second positioning hole, a third positioning slot, and a fourth positioning slot. A backplane includes six rivet pins respectively received in the first and second positioning holes and the first, second, third, and fourth positioning slots. The first and second positioning slots and the third and fourth positioning slots are of a right-angled trapezoidal shape having a straight side that is open and an inclined side that is inclined downward in a direction toward the first or second positioning hole. The rivet pins received in the first, second, third, and fourth positioning slots respectively abut against the inclined sides of the trapezoids.