Bracket Design for LCD Backlight Thermal Deformation
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Solution Overview
Problem
Deformation of the backlight unit due to thermal expansion in liquid crystal display devices leads to image quality issues, particularly in large or high luminance panels, as this deformation is transferred to the liquid crystal panel through the front surface panel, causing uneven luminance and reduced image quality.
Innovation Solution
A liquid crystal display device configuration that includes a transparent front surface panel bonded to the liquid crystal panel with a transparent adhesive resin layer and a bracket fixed to the backlight unit's side face, featuring a side wall and a beam portion with increased flexural rigidity to mitigate deformation by distributing stress effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the front surface panel is fixed to the backlight unit using adhesive or double-sided tape, then the structure is simple and easy to manufacture, but thermal expansion of the backlight unit causes deformation that transfers to the liquid crystal panel, reducing image quality
Solution Approach 1:
The patent introduces a bracket as an intermediary component between the backlight unit and the front surface panel. This bracket absorbs and isolates the thermal expansion deformation, preventing it from transferring to the liquid crystal panel. The bracket acts as a mediator that decouples the thermal deformation path while maintaining the structural bonding function.
Solution Approach 2:
The patent segments the bonding structure into multiple independent components: the backlight unit, the bracket, and the front surface panel. By dividing the originally direct bonding structure into separate segments connected by the bracket, the deformation of one component (backlight unit) does not directly affect the other (liquid crystal panel), thus resolving the contradiction between manufacturing simplicity and image quality.
2Manufacturing precision
If the front surface panel is suspended away from the backlight unit, then deformation transfer is reduced and image quality is improved, but the device complexity increases due to additional support structures
Solution Approach 1:
The bracket serves multiple functions simultaneously: it provides mechanical support for the front surface panel, absorbs thermal expansion deformation, and maintains the suspended configuration needed for image quality. This multi-functionality reduces device complexity compared to having separate components for each function.
3Strength
If adhesive is used to bond the front surface panel to the backlight unit, then the bonding is simple and strong, but the adhesive transmits thermal deformation directly to the panel, causing uneven luminance
Solution Approach 1:
The bracket serves as an intermediary that breaks the direct adhesive bonding path between the backlight unit and front surface panel. This intermediary structure maintains bonding strength while preventing the transmission of thermal deformation, thus resolving the contradiction between bonding strength and luminance uniformity.
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 configuration significantly reduces deformation of the front surface panel and subsequently the liquid crystal panel, enhancing image quality by minimizing stress and maintaining uniform luminance, especially in large or high luminance displays.
Implementation Method 1
a rear main surface bonded to a front main surface of the liquid crystal panel by a transparent adhesive resin layer
Implementation Method 2
a bracket that is fixed to a side face of the backlight unit and bonded to the rear main surface of the front surface panel by an adhesive portion. The bracket includes: a side wall that is fixed to the side face of the backlight unit, rises from rear to front along the side face, and extends along a side face of the front surface panel; and a beam portion in front of the side wall. The beam portion has at least a portion that is continuous with the side wall, protrudes to outside the side wall along the rear main surface of the front surface panel
Data Source
AI summary
A liquid crystal display device includes a bracket that is fixed to a side face of a backlight unit and bonded to the rear main surface of a front surface panel by an adhesive portion. The bracket includes: a side wall that is fixed to a the side face of the backlight unit, rises from rear to front along the side face, and extends along a side face of the front surface panel; and a beam portion in front of the side wall. The beam portion has at least a portion that is continuous with the side wall, protrudes to outside the side wall along the rear main surface of the front surface panel, extends along the side face of the front surface panel, and is bonded to the rear main surface of the front surface panel by the adhesive portion.