Backlight Module Positioning Member for Display Gap Control
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Solution Overview
Problem
In liquid crystal display devices, the gap between the light incident surface of the light guide plate and the light source can vary significantly due to machining errors and thermal expansion, leading to uneven display images and varying display quality across different devices.
Innovation Solution
A back light module design featuring a positioning member with a sliding slot and elastic member, which positions the light guide plate relative to the light source, ensuring a fixed gap and minimizing the impact of machining errors and thermal expansion, by allowing the positioning member to slide to a preset position and using an elastic member to absorb thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a positioning slot and positioning pin are used to position the light guide plate, then the light guide plate can be positioned, but machining errors and thermal expansion cause the gap between the light guide plate and light source to vary, leading to uneven display images and varying display quality
Solution Approach 1:
The patent employs a spring-loaded positioning pin that can dynamically adjust its position within the positioning slot. The spring allows the pin to move elastically in response to thermal expansion or machining variations, maintaining constant contact with the light guide plate while compensating for dimensional changes. This dynamic mechanism ensures the gap between the light guide plate and light source remains stable, resolving the contradiction between initial positioning accuracy and long-term display quality consistency
Solution Approach 2:
The patent changes the physical state of the positioning system by introducing elastic deformation through the spring mechanism. The spring's elastic properties allow it to absorb dimensional variations and thermal expansion, converting rigid positioning constraints into flexible parameter adjustments. This enables the system to maintain optimal gap dimensions despite variations in manufacturing tolerances and thermal conditions, thereby ensuring consistent display quality
2Stability of the object's composition
If an expansion gap is left between the positioning slot and positioning pin to accommodate thermal expansion, then thermal expansion can be accommodated, but the gap between the light guide plate and light source becomes difficult to control, causing display image unevenness
Solution Approach 1:
The spring-loaded positioning pin creates a dynamic positioning system that actively compensates for thermal expansion. Rather than leaving a fixed expansion gap that compromises positioning precision, the spring mechanism allows the pin to move elastically, maintaining constant contact with the light guide plate while accommodating dimensional changes. This dynamic adjustment preserves both thermal expansion accommodation and gap control precision
Solution Approach 2:
The spring acts as an intermediary element between the positioning pin and the light guide plate. It mediates the interaction by providing elastic compliance, allowing the rigid pin to adapt to thermal expansion without creating uncontrolled gaps. The spring absorbs the dimensional variations and transmits only the necessary positioning force, thereby maintaining precise gap control while accommodating thermal effects
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 stabilizes the gap between the light guide plate and the light source, resulting in improved evenness of display images and consistent quality across different liquid crystal display devices, regardless of machining errors or thermal expansion.
Implementation Method 1
since the light guide plate is fragile and has the thermal expansion and contraction characteristics
Implementation Method 2
using an elastic member to absorb thermal expansion
Data Source
AI summary
Disclosed are back light module and display device. The back light module comprises a light source, a back plate, a light guide plate and a positioning member. The back plate is formed with a frame for receiving the light guide plate; the light source is provided on an inside surface of a side panel of the back plate and oppositely to a light incident surface of the light guide plate. The positioning member is provided at both ends of the back plate on a side where the light source is formed and interposed between the light incident surface of light guide plate and the light source. The back light module herein ensures that the gap between the light incident surface of light guide plate and the light source has fixed value, thereby improving evenness of display images of display device.