Unified Positioning Structure for Backlight Source Thermal Expansion
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Solution Overview
Problem
Existing backlight sources for liquid crystal displays face complexity due to different thermal expansion coefficients of light guide plates and optical films, requiring separate positioning structures that increase the overall complexity of the system.
Innovation Solution
A positioning structure with protruding elements forming contact surfaces at different planes for both the light guide plate and optical film, with the distance between these surfaces designed to accommodate thermal expansion differences, allowing for a unified and simplified structure that enhances positioning redundancy and extendability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate positioning structures are used for light guide plate and optical film, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines two separate positioning structures into a single integrated positioning structure that simultaneously positions both the light guide plate and optical film. The structural body includes a first positioning structure for the light guide plate and a second positioning structure for the optical film, merging previously separate components into one unified structure, thereby reducing device complexity while maintaining positioning accuracy
Solution Approach 2:
The integrated positioning structure serves multiple functions: it positions the light guide plate through the first positioning structure and positions the optical film through the second positioning structure. This multi-functional design eliminates the need for separate positioning mechanisms, reducing overall structure complexity while achieving accurate positioning for both components
2Device complexity
If unified positioning structure is used for light guide plate and optical film, then device complexity is reduced, but positioning precision deteriorates due to thermal expansion differences
Solution Approach 1:
The integrated positioning structure is segmented into distinct first and second positioning structures, each optimized for its specific component. The first positioning structure with its contact positioning surfaces is designed for the light guide plate, while the second positioning structure is designed for the optical film, allowing each segment to maintain high positioning precision despite thermal expansion differences
Solution Approach 2:
The positioning structure incorporates thermal expansion compensation by designing the distance between contact positioning surfaces and the bottom surface to accommodate thermal expansion amounts. The parameters are set so that the distance is less than or equal to the thermal expansion amount of the light guide plate and greater than the difference between thermal expansion amounts of the light guide plate and optical film, ensuring positioning precision under thermal conditions
3Reliability
If distance between positioning surfaces is increased to accommodate thermal expansion, then reliability is improved, but positioning precision deteriorates
Solution Approach 1:
The patent optimizes the distance parameter between the contact positioning surfaces and the bottom surface to simultaneously achieve thermal expansion accommodation and positioning precision. The distance is set to be less than or equal to the thermal expansion amount of the light guide plate (improving reliability) while maintaining sufficient positioning accuracy by not exceeding this limit
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
The solution simplifies the backlight source structure by providing a unified positioning system for both components, reducing complexity and ensuring accurate alignment despite thermal expansion differences, thereby improving operational efficiency and stability.
Implementation Method 1
a distance between the contact positioning surface and the bottom surface is less than or equal to a thermal expansion amount of the light guide plate when the backlight source is in operation and greater than a preset value, wherein the preset value is a difference value between a thermal expansion amount of the light guide plate and a thermal expansion amount of the optical film when the backlight source is in operation
Data Source
AI summary
The present disclosure provide a positioning structure, a backlight source, a display module, and a display device, and the positioning structure is applied to a backlight source include a light guide plate and an optical film, the positioning structure includes a structural body, the structural body includes: multiple protruding structures spaced from each other, an end portion of each of the protruding structures adjacent to the light guide plate forming a contact positioning surface, and at least two contact positioning surfaces located in a same plane forming a first positioning surface for positioning an end surface of the light guide plate; wherein the structural body is provided with a second positioning surface for positioning an end surface of the optical film of the backlight source, and the second positioning surface and the first positioning surface are located at different planes.