Display Device Reflective Sheet Flexion Suppression
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Solution Overview
Problem
Resin-based display devices with edge light backlights face issues due to thermal expansion and contraction, causing flexion in the reflective sheet as the rear frame expands or contracts, which can lead to mechanical stress and potential damage.
Innovation Solution
The display device incorporates a supporting member and a back surface enclosure with specific fixing parts to create a gap between the reflective sheet and the light guide plate, reducing the fixing force near the opening and enhancing the pulling force at the fastening location, thereby suppressing flexion of the reflective sheet during temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the rear frame is formed of resin to reduce weight and simplify manufacturing, then ease of manufacture is improved, but the rear frame expands or contracts according to environmental temperature, causing flexion in the reflective sheet
Solution Approach 1:
The back surface enclosure is divided into multiple ribs (first ribs and second ribs) that are spatially separated. The first ribs fix the light guide plate while the second ribs fix the reflective sheet, creating independent fixing zones that prevent coupled thermal deformation
Solution Approach 2:
Different regions of the back surface enclosure are given different functions: first ribs are positioned to fix the light guide plate while second ribs are positioned to fix the reflective sheet. This local differentiation allows each rib to address specific thermal expansion issues in its region without affecting the entire structure uniformly
2Reliability
If the reflective sheet is interposed between the rib of the rear frame and the rib of the mold frame to secure it, then the reflective sheet is fixed in position, but the rib of the rear frame pulls the reflective sheet when the rear frame expands or contracts, causing flexion
Solution Approach 1:
The fixing function is segmented between first ribs (for light guide plate) and second ribs (for reflective sheet). This separation prevents the concentrated thermal stress that would occur if a single continuous rib structure fixed both components simultaneously
Solution Approach 2:
The reflective sheet is positioned between the second ribs and the mold frame ribs, creating a distributed fixing system. This intermediary positioning allows the sheet to be secured while distributing thermal expansion forces across multiple discrete contact points rather than a continuous constraint
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 configuration effectively minimizes the flexion of the reflective sheet due to environmental temperature variations, ensuring the display device's structural integrity and maintaining image quality.
Implementation Method 1
resin has a property of expanding in a comparatively high environmental temperature and shrinking in a comparatively low environmental temperature. The rear frame formed of resin therefore has a tendency to expand or shrink according to an environmental temperature around the display device.
Data Source
AI summary
A display device includes a display panel, a light source that emits light, a light guide plate comprising a lateral surface that receives the light, wherein the light source emits the light to the lateral surface from a main surface to a back surface of the display panel, a supporting member provided between a peripheral portion of the display panel and a peripheral portion of the light guide plate and that supports the peripheral portion of the display panel, a reflective sheet disposed so as to cover a back surface on an opposite side of the main surface of the light guide plate and that comprises an opening at a position corresponding to the peripheral portion of the light guide plate, and a back surface enclosure disposed so as to oppose the reflective sheet and that includes a first fixing part and a second fixing part.