Display Device Light Guide Plate Positioning via Elastic Limiting Slot
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Solution Overview
Problem
Narrow bezels in display devices lead to light leakage due to the expansion space required between the light guide plate and positioning post in conventional backlight modules, affecting user visual experience.
Innovation Solution
A display device design that includes a frame body, a positioning unit, a light guide plate, and an elastic unit, where the light guide plate and elastic unit abut against the side wall portion of the positioning unit, eliminating the need for an expansion space and using a limiting slot to restrict the positioning protrusion's movement, thereby preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an expansion space is reserved between the light guide plate and positioning post in a conventional backlight module, then the light guide plate can accommodate thermal expansion, but light leakage occurs when the bezel is narrow and the expansion space enters the visual area
Solution Approach 1:
The patent changes the positioning mechanism from a fixed expansion space to a dynamic limiting slot that guides the positioning protrusion's movement path. The limiting slot's shape and orientation control how the light guide plate expands and positions itself, transforming the parameter of positioning geometry to eliminate light leakage while maintaining thermal expansion capability
Solution Approach 2:
The positioning protrusion acts as an intermediary element that mediates between the light guide plate and the limiting slot. It transfers the thermal expansion movement of the light guide plate into controlled motion along the limiting slot's path, ensuring the expansion space does not enter the visual area while maintaining proper positioning
2Strength
If the light guide plate is allowed to expand freely with temperature changes, then thermal stress is reduced, but the positioning accuracy deteriorates due to uncontrolled movement
Solution Approach 1:
The patent applies dynamics by allowing the positioning protrusion to move freely within the constraints of the limiting slot. The slot's geometry dynamically adapts to thermal expansion while maintaining positioning control, enabling the system to transition from static positioning to dynamic controlled movement that accommodates temperature changes without losing precision
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 effectively avoids light leakage and maintains the positioning of the light guide plate, even when it expands or shrinks due to temperature changes, by eliminating the need for an expansion space and limiting the movement of the positioning protrusion within the wide edge direction of the limiting slot.
Implementation Method 1
the elastic unit is located in the frame body and has a compressed state or a non-compressed state. When the elastic unit is in the non-compressed state, one end of the elastic unit abuts against the side wall plate, and the other end abuts against the side wall portion
Implementation Method 2
When the light guide plate is heated, the positioning protrusion is driven to move to a second position of the limiting slot, and the elastic unit is pressed to be in the compressed state
Data Source
AI summary
A display device includes a frame body, a positioning unit, a light guide plate, and an elastic unit. The frame body includes a back plat which includes a limiting slot. The positioning includes a loading portion, a side wall portion, and a positioning protrusion. The positioning protrusion is located on the loading portion and extends toward the back plate to fit in the limiting slot. When the elastic unit is in the non-compressed state, one end of the elastic unit abuts against the side wall plate, and the other end abuts against the side wall portion so that the positioning protrusion is at a first position of the limiting slot. When the light guide plate is heated, the positioning protrusion is driven to move to a second position of the limiting slot, and the elastic unit is pressed to be in the compressed state.