Display Device Frame Protrusion Prevents Bubble Trapping
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Solution Overview
Problem
Display devices with liquid crystal panels in in-plane switching or fringe-field switching modes face issues of display inhomogeneity due to improper light emission direction and trapped bubbles between protective or touch panels and the display panel, caused by insufficient affixing pressure and non-uniform attachment.
Innovation Solution
A display device design featuring a support made of an elastic material with a frame-shaped structure that includes a protruding portion thinner than the support, creating a clearance between the protruding portion and the display panel, which supports the panel with minimal position change during affixing, preventing bubble trapping and ensuring uniform attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cushion or spacer made of elastic material is used to support the display panel, then the display panel is protected from stress and foreign matter, but the pressing pressure for affixing the protective plate or touch panel becomes insufficient causing bubbles and display inhomogeneity
Solution Approach 1:
The support structure is divided into two distinct functional zones: a first support portion made of elastic material for absorbing stress and preventing foreign matter entry, and a second support portion made of rigid material for providing stable pressing pressure during affixing. This segmentation allows each portion to independently fulfill its specific function without compromising the other.
Solution Approach 2:
Different materials with different properties are used in different locations of the support structure. The first support portion uses elastic material (high flexibility) while the second support portion uses rigid material (high stiffness). This local differentiation of material properties optimizes the performance for each specific functional requirement.
2Stability of the object's composition
If the elastic component is compressed to support the display panel, then the display panel position changes significantly, but this causes insufficient pressing pressure and bubble trapping
Solution Approach 1:
The support structure is divided into two distinct functional zones: a first support portion made of elastic material for absorbing stress and preventing foreign matter entry, and a second support portion made of rigid material for providing stable pressing pressure during affixing. This segmentation allows each portion to independently fulfill its specific function without compromising the other.
Solution Approach 2:
The material property parameter (elasticity vs. rigidity) is changed between the two support portions to achieve different functional outcomes. The rigid second support portion maintains dimensional stability and provides consistent pressing pressure, while the elastic first support portion allows for stress absorption and positioning adjustment.
3Strength
If a rigid frame is used to hold the backlight unit, then structural strength is improved, but stress is transmitted to the display panel causing display inhomogeneity
Solution Approach 1:
The first support portion made of elastic material acts as an intermediary between the rigid frame and the display panel. It absorbs and isolates the stress from the rigid frame, preventing direct transmission to the display panel while maintaining the structural strength benefits of the rigid frame.
Solution Approach 2:
Different materials with different properties are used in different locations of the support structure. The first support portion uses elastic material (high flexibility) while the second support portion uses rigid material (high stiffness). This local differentiation of material properties optimizes the performance for each specific functional requirement.
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
Prevents bubble trapping and display inhomogeneity by maintaining the display panel's position and ensuring uniform affixing of protective or touch panels, while maintaining the panel's non-deformed state and preventing scratches.
Implementation Method 1
a support (40) made of an elastic material
Data Source
AI summary
The object is to provide a technique capable of preventing, in a display device, bubbles from being trapped between a protective plate or a touch panel and a display panel and occurrence of display inhomogeneity. The display device includes a display panel, a backlight unit, a cushion serving as a support, and a first frame. The first frame includes: an opening through which the backlight unit is seen; a sidewall covering side surfaces of the backlight unit to form the opening; a panel facing portion extending from the sidewall toward the opening side to cover an end portion of the backlight unit; and a protruding portion protruding from the panel facing portion toward the display panel side. The cushion is disposed on the panel facing portion. The protruding portion is thinner than the cushion. A predetermined clearance is created between the tip of the protruding portion and the display panel.