Display Apparatus Board Combining Member Thermal Expansion
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Solution Overview
Problem
Conventional display apparatuses face issues where the driving printed circuit board (DPCB) moves due to thermal expansion of the container, causing the flexible printed circuit board (FPCB) to twist, tear, or warp, as it is not independent of the container's expansion.
Innovation Solution
A display apparatus design that incorporates a board combining member, such as adhesive tape or guiding protrusions, to allow the DPCB to move with the container's thermal expansion without affecting its position relative to the FPCB, thereby preventing damage to the FPCB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the DPCB is fixed on the container to prevent movement, then the DPCB position is stabilized, but the FPCB is twisted, torn, or warped due to thermal expansion
Solution Approach 1:
The connection between the container and DPCB is segmented through intermediate structures (combining protrusions with combining holes, guiding protrusions, or adhesive layers) that allow independent thermal expansion of each component while maintaining their relative positions. This segmentation enables the container and DPCB to expand independently without transmitting harmful stresses to the FPCB.
Solution Approach 2:
The connection structure is designed to be dynamic rather than rigid, allowing the DPCB to move with the container's thermal expansion through guided motion. The combining protrusions with combining holes or guiding protrusions enable controlled movement that accommodates thermal expansion while preventing FPCB damage.
2Reliability
If the DPCB is allowed to move with container expansion, then the FPCB is protected from damage, but the DPCB position becomes unstable relative to the container
Solution Approach 1:
An intermediary connection structure is introduced between the container and DPCB, consisting of combining protrusions with combining holes or guiding protrusions. This intermediary element mediates the thermal expansion by allowing controlled movement while maintaining stable relative positioning, thus protecting the FPCB from damage.
Solution Approach 2:
The connection structure utilizes differences in thermal expansion coefficients between materials and designs geometric parameters (such as the shape and orientation of combining holes and protrusions) to accommodate thermal expansion. The combining holes are oriented in the thermal expansion direction, allowing the DPCB to move with the container while maintaining stable relative position.
3Strength
If a rigid connection is used between DPCB and container, then structural strength is improved, but thermal expansion causes FPCB warping
Solution Approach 1:
The connection structure incorporates flexible elements such as adhesive layers or compliant guiding protrusions that can deform during thermal expansion. These flexible elements maintain connection strength while accommodating thermal expansion, preventing FPCB warping by allowing controlled movement rather than rigid constraint.
Solution Approach 2:
The connection is designed to be dynamic, allowing the DPCB to move with the container's thermal expansion through guided motion. The combining protrusions with combining holes or guiding protrusions enable controlled movement that maintains connection strength while protecting the FPCB from damage.
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 ensures the DPCB remains stable relative to the FPCB during thermal expansion, preventing warping and tearing of the FPCB, and compensates for differences in thermal expansion coefficients between the container and the DPCB.
Implementation Method 1
When a container of a conventional backlight assembly and display apparatus is expanded due to the heat generated from the light source
Implementation Method 2
The board combining member may include an adhesive tape that adheres the DPCB to the outer face of the container
Data Source
AI summary
A display apparatus includes a backlight assembly, a display assembly and a board combining member. The backlight assembly includes a light source generating light and a container receiving the light source. The display assembly includes a display panel received in the container and displaying an image, a driving printed circuit board (“DPCB”) disposed on an outer face of the container, and a flexible printed circuit board (“FPCB”) connecting the DPCB to the display panel. The board combining member combines the DPCB with the outer face of the container to be capable of moving corresponding to a thermal expansion of the container such that a position of the DPCB with respect to the FPCB is not substantially changed. Thus, the FPCB is prevented from warping due to the thermal expansion of the container.